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1

Attachment systems for mandibular implant overdentures: a systematic review  

PubMed Central

PURPOSE The aim of this systematic review was to address treatment outcome according to attachment systems for mandibular implant overdentures in terms of implant survival rate, prosthetic maintenance and complications, and patient satisfaction. MATERIALS AND METHODS A systematic literature search was conducted using PubMed and hand searching of relevant journals considering inclusion and exclusion criteria. Clinical trial studies on mandibular implant overdentures until August, 2010 were selected if more than one type of overdenture attachment was reported. Twenty four studies from 1098 studies were finally included and the data on implant survival rate, prosthetic maintenance and complications, patient satisfaction were analyzed relative to attachment systems. RESULTS Four studies presented implant survival rates (95.8 - 97.5% for bar, 96.2 - 100% for ball, 91.7% for magnet) according to attachment system. Ten other studies presented an implant survival rate ranging from 93.3% to 100% without respect to the attachment groups. Common prosthetic maintenance and complications were replacement of an assay for magnet attachments, and activation of a matrix or clip for ball or bar attachments. Prosthetic maintenance and complications most commonly occurred in the magnet groups. Conflicting findings were found on the rate of prosthetic maintenance and complications comparing ball and bar attachments. Most studies showed no significant differences in patient satisfaction depending upon attachment systems. CONCLUSION The implant survival rate of mandibular overdentures seemed to be high regardless attachment systems. The prosthetic maintenance and complications may be influenced by attachment systems. However patient satisfaction may be independent of the attachment system. PMID:23236571

Kim, Ha-Young; Lee, Jeong-Yol; Bryant, S. Ross

2012-01-01

2

Metal-reinforced single implant mandibular overdenture retained by an attachment: a clinical report.  

PubMed

Results of studies have shown that a single implant mandibular overdenture significantly increases the satisfaction and quality of life of patients with edentulism. The single implant-retained overdenture has the additional advantage of being less expensive and invasive than a 2-implant supported overdenture but has a high incidence of fracture of the acrylic resin base at the point of the implant. The treatment, design, and fabrication of a metal-reinforced single-implant mandibular overdenture with the Locator attachment as a retention device is described. PMID:24199604

Grageda, Edgar; Rieck, Bastian

2014-01-01

3

Mandibular overdentures anchored to single implants: A five-year prospective study  

Microsoft Academic Search

Statement of problem. It is unknown what minimum number of implants are required to satisfactorily support and retain a mandibular overdenture.Purpose. The purpose of this study was to evaluate a treatment modality by using mandibular overdentures anchored to single implants in a geriatric patient population.Material and methods. Twenty-one patients with a mean age of 74.2 years were treated with single

Giampiero Cordioli; Zeina Majzoub; Stefano Castagna

1997-01-01

4

Implant Supported Mandibular Overdenture: A Viable Treatment Option for Edentulous Mandible  

PubMed Central

The prosthetic management of the edentulous patient has long been a major challenge. Complete maxillary and mandibular dentures have been the traditional standard of care. However, most of the patients report problems adapting to their mandibular denture due to a lack of comfort, retention, stability and inability to masticate. Implant-supported overdentures have been a common treatment for edentulous patients for the past 20 years and predictably achieve good clinical results. Implant supported overdentures offer many practical advantages over conventional complete dentures and removable partial dentures. These include decreased bone resorption, reduced prosthesis movement, better esthetics, improved tooth position, better occlusion, increased occlusal function and maintenance of the occlusal vertical dimension. This article presents a design and fabrication technique of the implant-retained overdenture that uses four freestanding mandibular implants. PMID:24995252

Lambade, Pravin; Gundawar, Sham

2014-01-01

5

Implant supported mandibular overdenture: a viable treatment option for edentulous mandible.  

PubMed

The prosthetic management of the edentulous patient has long been a major challenge. Complete maxillary and mandibular dentures have been the traditional standard of care. However, most of the patients report problems adapting to their mandibular denture due to a lack of comfort, retention, stability and inability to masticate. Implant-supported overdentures have been a common treatment for edentulous patients for the past 20 years and predictably achieve good clinical results. Implant supported overdentures offer many practical advantages over conventional complete dentures and removable partial dentures. These include decreased bone resorption, reduced prosthesis movement, better esthetics, improved tooth position, better occlusion, increased occlusal function and maintenance of the occlusal vertical dimension. This article presents a design and fabrication technique of the implant-retained overdenture that uses four freestanding mandibular implants. PMID:24995252

Lambade, Dipti; Lambade, Pravin; Gundawar, Sham

2014-05-01

6

Two-implant mandibular overdentures: simple to fabricate and easy to wear.  

PubMed

Success rates for titanium dental implants in the anterior mandible are very high. Because of these success rates, as well as lower costs, it is common to treat edentulous patients with just 2 implants and ball anchors for retention of the overdenture, instead of 4 implants and a bar. In this paper the fabrication of 2-implant overdentures is described. In a controlled clinical trial (to be reported elsewhere), 30 subjects received a 2-implant overdenture for the mandible and a conventional prosthesis for the maxilla. The 30 control patients received conventional complete dentures for both jaws. The stability of the overdentures was excellent, and the lingual dimensions of the denture could be reduced to the level of the mylohyoid line to provide more space for the tongue. In patients with tense labial musculature or a limited amount of attached gingiva, it was important to elevate the shoulder of the implant and ball abutment above the gingival level to avoid peri-implant problems. Significantly fewer visits for adjustment related to post-placement pressure spots were required for mandibular overdentures than for conventional mandibular prostheses. PMID:12556267

Klemetti, Esa; Chehade, Antoine; Takanashi, Yoshiaki; Feine, Jocelyne S

2003-01-01

7

Overdentures on primary mandibular implants in patients with oral cancer: a follow-up study over 14 years.  

PubMed

We aimed to assess oral functioning, patients' satisfaction, condition of peri-implant tissues, and survival of implants up to 14 years after their insertion in patients with oral cancer who had had mandibular overdentures placed over primary implants. Endosseous dental implants were inserted prospectively in the interforaminal region of the mandible during resection of the tumour in 164/180 patients with oral cancer. All 58 patients were evaluated by questionnaires and clinical assessments during a final assessment in 2012. Implant-retained mandibular overdentures were inserted, and prosthetic rehabilitation and oral functioning were not associated with primary site or stage of the tumour, number or type of implants inserted, or the type of reconstruction. Over time the peri-implant mucosa was usually free of inflammation. More implants were lost in patients treated by radiotherapy (27/318, 8.5%) than in those not so treated (1/206, 0.5%). Patients who had been treated by irradiation reported more problems in oral functioning and less satisfaction than those who had not. Patients with an implant-retained mandibular overdenture reported fewer problems in oral functioning than patients without an overdenture. Primary insertion of an implant should be routinely incorporated in the surgical planning for patients with oral cancer, as oral functioning in those wearing mandibular overdentures improved considerably and peri-implant health was at least reasonable. PMID:24951245

Korfage, Anke; Raghoebar, Gerry M; Slater, James J R Huddleston; Roodenburg, Jan L N; Witjes, Max J H; Vissink, Arjan; Reintsema, Harry

2014-11-01

8

Standardizing the evaluation criteria on treatment outcomes of mandibular implant overdentures: a systematic review  

PubMed Central

PURPOSE The aim of this review was to analyze the evaluation criteria on mandibular implant overdentures through a systematic review and suggest standardized evaluation criteria. MATERIALS AND METHODS A systematic literature search was conducted by PubMed search strategy and hand-searching of relevant journals from included studies considering inclusion and exclusion criteria. Randomized clinical trials (RCT) and clinical trial studies comparing attachment systems on mandibular implant overdentures until December, 2011 were selected. Twenty nine studies were finally selected and the data about evaluation methods were collected. RESULTS Evaluation criteria could be classified into 4 groups (implant survival, peri-implant tissue evaluation, prosthetic evaluation, and patient satisfaction). Among 29 studies, 21 studies presented implant survival rate, while any studies reporting implant failure did not present cumulative implant survival rate. Seventeen studies evaluating peri-implant tissue status presented following items as evaluation criteria; marginal bone level (14), plaque Index (13), probing depth (8), bleeding index (8), attachment gingiva level (8), gingival index (6), amount of keratinized gingiva (1). Eighteen studies evaluating prosthetic maintenance and complication also presented following items as evaluation criteria; loose matrix (17), female detachment (15), denture fracture (15), denture relining (14), abutment fracture (14), abutment screw loosening (11), and occlusal adjustment (9). Atypical questionnaire (9), Visual analog scales (VAS) (4), and Oral Health Impact Profile (OHIP) (1) were used as the format of criteria to evaluate patients satisfaction in 14 studies. CONCLUSION For evaluation of implant overdenture, it is necessary to include cumulative survival rate for implant evaluation. It is suggested that peri-implant tissue evaluation criteria include marginal bone level, plaque index, bleeding index, probing depth, and attached gingiva level. It is also suggested that prosthetic evaluation criteria include loose matrix, female detachment, denture fracture, denture relining, abutment fracture, abutment screw loosening, and occlusal adjustment. Finally standardized criteria like OHIP-EDENT or VAS are required for patient satisfaction.

Kim, Ha-Young; Shin, Sang-Wan

2014-01-01

9

Use of an Implant O-Ring Attachment for the Tooth Supported Mandibular Overdenture: A Clinical Report  

PubMed Central

Retention of a mandibular denture can be achieved by an implant-retained or natural tooth-retained bar and stud attachment in the anterior segment of the mandible. The same design principles holds true for both implant-retained and tooth-retained methods of anchoring the bar and stud attachment. A simple and cost effective treatment for more complex implant overdenture is the concept of conventional tooth-retained overdentures. When few firm teeth still remain in a compromised dentition, preservation of these teeth for overdentures can improve retention and stability. The authors present a clinical report of a patient treated with a mandibular tooth-borne overdenture with bar and O-ring attachment. A splinted bar supported the prosthesis and an O-ring retained the denture. PMID:21769276

Guttal, Satyabodh S.; Tavargeri, Anand K.; Nadiger, Ramesh K.; Thakur, Srinath L.

2011-01-01

10

Implant-supported overdenture with prefabricated bar attachment system in mandibular edentulous patient.  

PubMed

Implant-supported overdenture is a reliable treatment option for the patients with edentulous mandible when they have difficulty in using complete dentures. Several options have been used for implant-supported overdenture attachments. Among these, bar attachment system has greater retention and better maintainability than others. SFI-Bar® is prefabricated and can be adjustable at chairside. Therefore, laboratory procedures such as soldering and welding are unnecessary, which leads to fewer errors and lower costs. A 67-year-old female patient presented, complaining of mobility of lower anterior teeth with old denture. She had been wearing complete denture in the maxilla and removable partial denture in the mandible with severe bone loss. After extracting the teeth, two implants were placed in front of mental foramen, and SFI-Bar® was connected. A tube bar was seated to two adapters through large ball joints and fixation screws, connecting each implant. The length of the tube bar was adjusted according to inter-implant distance. Then, a female part was attached to the bar beneath the new denture. This clinical report describes two-implant-supported overdenture using the SFI-Bar® system in a mandibular edentulous patient. PMID:23236580

Ha, Seung-Ryong; Kim, Sung-Hun; Song, Seung-Il; Hong, Seong-Tae; Kim, Gy-Young

2012-11-01

11

In vivo forces on oral implants supporting a mandibular overdenture: the influence of attachment system.  

PubMed

This study was designed to gain insight into the influence of the attachment system on the loading conditions of oral implants supporting a mandibular overdenture on two implants. Five patients were selected and were provided with two implants in the canine area of the mandible (Brånemark System). All patients received a new mandibular overdenture that could be mounted on an ovoid-shaped bar (Dolder, C&M): (a) with and (b) without bilateral extensions and (c) on ball-attachments (Nobel Biocare). Using three strain gauges attached to the outer surface of the 5.5-mm standard abutments, the axial forces and bending moments on both supporting implants could be quantified. Load registrations were made during application of 50 N on seven predetermined positions along the occlusal surface of the prosthesis and during maximal biting in maximal occlusion (clenching). The results revealed no differences in induced axial force for the various anchorage devices, unlike the differences in bending moment. Although there is a tendency for better axial load sharing with bars and better sharing of bending moments with ball attachments, these differences were not significant. PMID:10803135

Duyck, J; Van Oosterwyck, H; Vander Sloten, J; De Cooman, M; Puers, R; Naert, I

1999-12-01

12

Implant-supported mandibular overdentures in very old adults: a randomized controlled trial.  

PubMed

The purpose of this study was (1) to investigate denture satisfaction following the conversion of existing mandibular complete dentures to implant overdentures (IOD) in very old edentulous patients who depend on help for activities of daily living and (2) to evaluate secondary end points, such as functional, structural, nutritional, and patient-centered aspects. For this randomized clinical trial, 2 interforaminal short implants were placed in the intervention group (n = 16, 85.0 ± 6.19 yrs) to retain mandibular IODs; the control group (n = 18, 84.1 ± 5.55 yrs) received conventional relines. During the first year, no implant was lost; however, 2 patients died. IODs proved more stable, and participants in the intervention group demonstrated significantly higher denture satisfaction as well as an increased oral health-related quality of life compared to the control group. Maximum voluntary bite force improved significantly with IODs, yet the chewing efficiency was not different between groups. Masseter muscle thickness increased with IODs, mainly on the preferred chewing side. Body mass index decreased in both groups, but the decline tended to be smaller in the intervention group; blood markers and the Mini Nutritional Assessment did not confirm this tendency. These results indicate that edentulous patients who depend on help for activities of daily living may benefit from IODs even late in life. PMID:24158342

Müller, F; Duvernay, E; Loup, A; Vazquez, L; Herrmann, F R; Schimmel, M

2013-12-01

13

Marginal bone resorption around immediate and delayed loaded implants supporting a locator-retained mandibular overdenture. A 1-year randomised controlled trial.  

PubMed

The aim of this 1-year study was to evaluate and compare crestal bone loss and clinical outcomes of immediate and delayed loaded implants supporting mandibular overdentures with Locator attachments. In a randomised controlled clinical trial, 36 completely edentulous patients (mean age 59.6 years) who desired to improve the stability of their mandibular dentures were randomly assigned into two groups. Each patient received two implants in the canine area of the mandible after a minimal flap reflection. Implants were loaded by mandibular overdentures either 3 months (delayed loading group, G1) or the same day (immediate loading group, G2) after implant placement. Locator attachments were used to retain all overdentures to the implants. Peri-implant vertical (VBL) and horizontal (HBLO) bone losses and clinical parameters [plaque scores (PI), gingival scores (GI), probing depths (PD) and implant stability (ISQ)] were assessed at time of overdenture insertion (T0), 6 months (T6) and 12 months (T12) after overdenture insertion. After 12 months of overdenture insertion, two implants (5.5%) failed in G2. Vertical bone loss was significantly higher in G2 compared with G1, while HBLO demonstrated insignificant differences between groups. All clinical parameters (PI, GI, PD and ISQ) did not differ significantly between groups. Vertical bone loss was significantly correlated with PD and HBLO. Immediately loaded two implants supporting a Locator-retained mandibular overdenture are associated with more vertical bone resorption when compared to delayed loaded implants after 1 year. Clinical outcomes do not differ significantly between loading protocols. PMID:24814408

Elsyad, M A; Elsaih, E A; Khairallah, A S

2014-08-01

14

Effects of Mucosal Thickness on the Stress Distribution and Denture Stability of Mandibular Implant-Supported Overdentures with Unsplinted Attachments In Vitro  

PubMed Central

The aim of this study was to compare the effects of mucosal thickness on the stress pattern around implants and movement of implant-supported overdentures with ball/female and three different types of magnetic attachments. After insertion of two root-form implants into a mandibular model, the surface of the model was covered with a 1.5- or 3-mm layer of impression material to simulate the oral mucosa, and removable overdentures were fabricated on each model. A 50-N vertical force was applied to the right first molar, and the resultant stress distribution and denture movement were measured. In the 1.5-mm mucosal model, the magnetic attachments showed significantly lower bending moments than did the ball attachment. The denture base displacement was the lowest on a magnetic attachment. In this study, use of magnetic attachments could be advantageous for mandibular implant-supported overdentures based on lower stress and better denture stability especially in the thin mucosal model. PMID:21799705

Haruta, Asuka; Matsushita, Yasuyuki; Tsukiyama, Yoshihiro; Sawae, Yoshinori; Sakai, Nobuo; Koyano, Kiyoshi

2011-01-01

15

The maintenance requirements of mandibular overdentures stabilized by Astra Tech implants using three different attachment mechanisms--balls, magnets, and bars; 3-year results.  

PubMed

Thirty seven people were provided with mandibular overdentures stabilized by Astra Tech implants. Thirteen people were provided with ball attachments, 12 with magnet attachments and 12 with bar attachments. The patients were followed for 3 years and detailed records were kept of the extent of maintenance required after placement of the dentures. The bar attachment mechanism required 9 episodes of maintenance, compared to 38 for the ball attachment mechanism and 23 for the magnet attachment mechanism. There was no difference between the three groups for the amount of maintenance required by the overdentures. The design of the ball attachment changed during the study from a two piece to a one piece abutment. It is likely that had this "all in one" attachment been available from the beginning of the study, the amount of maintenance required by the ball attachment mechanism would have been considerably less. PMID:11692994

Davis, D M; Packer, M E

2000-12-01

16

A preliminary in vivo trial of load transfer in mandibular implant-retained overdentures anchored in 2 different ways: allowing and counteracting free rotation.  

PubMed

This in vivo pilot methodologic study used 3 patients to investigate load transfer in mandibular implant-retained overdentures anchored in 2 different ways: allowing (gap condition) and counteracting (contact condition) free rotation. Load cells and strain-gauged abutments were used to evaluate occlusal load, load transmitted to the nonworking-side mucosa, and stress on the working-side abutment, in both contact and gap conditions. The occlusal load was reduced and load was shifted from abutments to mucosa in the gap versus the contact condition. In the contact condition, patients reported more comfort and felt that they could exert greater occlusal force. PMID:17165296

Menicucci, Giulio; Ceruti, Paola; Barabino, Eva; Screti, Antonio; Bignardi, Cristina; Preti, Giulio

2006-01-01

17

Replacing worn overdenture abutments of an unknown implant system by using laser welding: A clinical report.  

PubMed

This clinical report describes a procedure for replacing worn ball abutments with low-profile resilient abutments by using laser welding when the implant system for a mandibular implant-supported overdenture could not be identified. PMID:24836281

Mohunta, Vrinda V; Stevenson, James A; Lee, Damian J

2014-09-01

18

Treatment planning: implant-supported partial overdentures.  

PubMed

When multiple anterior teeth are missing, many options of replacement are available. Traditionally, the choice was between a fixed or removable prostheses. Today, with the predictability of dental implants, the options of tooth replacement range from removable partial dentures to implant-supported fixed prostheses. The choice of which restoration that will best provide occlusion and esthetics depends on multiple factors including the number and location of missing teeth, the residual ridge form in relation to the replacement teeth, the relationship of the maxillary and mandibular anterior teeth, the condition of teeth adjacent to the edentulous span, the amount of bone available for implant placement, the patients "smile line" and display of teeth, lip support, and financial constraints. When there is minimal loss of the ridge contour, restorations that emerge from the ridge are the most functional and esthetic restorations, adhesive-type fixed partial dentures, conventional fixed partial dentures, and implant-supported restorations can be indicated with the choice of restoration dependent on a risk benefit and cost benefit analysis. When there is a loss of ridge contour due to residual ridge resorption or trauma, the decision becomes more complex as not only does the tooth structure need to be replaced, the ridge form also has to be replaced. (Figures 1 and 2). This can be assessed clinically as illustrated by Figures 1 and 2 where a dis crepancy in arch form and ridge form in relation to the adjacent teeth and/or opposing arch can be observed. Other considerations are lip support and display of the teeth when smiling. This article presents a case and rationale for implant-supported par tial overdentures. Many authors have written on the merits of com plete overdentures. The complete overdenture has proven to be an improvement over conventional complete prostheses with respect to chewing efficiency, patient comfort and satisfaction. In partial edentulism, the implant-supported overdenture has several advantages, some in common with a removable partial denture. PMID:15915882

Chee, Winston W L

2005-04-01

19

Immediate loading and implant-bar overdenture.  

PubMed

Immediate loaded implants may be used with an implant-bar overdenture to provide fixed splinting. This is a relatively new system that provides for immediate implant placement and restoration. PMID:24787132

Chang, John; Millstein, Philip

2014-10-01

20

Do implant overdentures improve dietary intake? A randomized clinical trial.  

PubMed

People wearing mandibular two-implant overdentures (IOD) chew food with less difficulty than those wearing conventional complete dentures (CD). However, there is still controversy over whether or not this results in better dietary intake. In this randomized clinical trials (RCT), the amounts of total dietary fiber (TDF), macronutrients, 9 micronutrients, and energy in diets consumed by persons with IOD and CD were compared. Male and female edentate patients ? 65 yrs (n = 255) were randomly divided into 2 groups and assigned to receive a maxillary CD and either a mandibular IOD or a CD. One year following prosthesis delivery, 217 participants (CD = 114, IOD = 103) reported the food and quantities they consumed to a registered dietician through a standard 24-hour dietary recall method. The mean and median values of TDF, macro- and micronutrients, and energy consumed by both groups were calculated and compared analytically. No significant between-group differences were found (ps > .05). Despite quality-of-life benefits from IODs, this adequately powered study reveals no evidence of nutritional advantages for independently living medically healthy edentate elders wearing two-implant mandibular overdentures over those wearing conventional complete dentures in their dietary intake at one year following prosthesis delivery. PMID:24158335

Hamdan, N M; Gray-Donald, K; Awad, M A; Johnson-Down, L; Wollin, S; Feine, J S

2013-12-01

21

Two implant overdenture-the first alternative treatment for patients with complete edentulous mandible  

PubMed Central

Given the increasing life expectancy in the coming years, dental practitioners, as other specialists from different medical fields, will encounter an increasing number of complete edentulous patients. These patients, with a longer active life and higher standards of life quality, will have different expectations for their complete dentures, higher than the standard treatment that uses conventional complete dentures. Two–implant overdenture is considered the first alternative treatment in complete edentulous mandible, according to current medical standards established by a team of specialists in prosthodontics and implantology, and globally known as the McGill Consensus from McGill University, Montreal, Canada. The Consensus was established during a–day?and–a–half session of presentations done by experts who presented data, scientific information on the subject, and, not less significant, personal experiences of participants and patients. Overdenture on implants, as an alternative treatment for complete edentulous mandible, has multiple benefits in achieving better conditions of prosthesis: balance and effectiveness, with positive effects on oral structures, aesthetics, and quality of life. Mandibular two–implant overdenture, established as a standard treatment by the highest international forum, should gradually become the first choice of treatment in complete edentulous mandible. PMID:21776308

Marin, M; Preoteasa, E; Tancu, AM; Preoteasa, CT

2011-01-01

22

An economic evaluation of maxillary implant overdentures based on six vs. four implants  

PubMed Central

Background The purpose of the present study was to assess the value for money achieved by bar-retained implant overdentures based on six implants compared with four implants as treatment alternatives for the edentulous maxilla. Methods A Markov decision tree model was constructed and populated with parameter estimates for implant and denture failure as well as patient-centred health outcomes as available from recent literature. The decision scenario was modelled within a ten year time horizon and relied on cost reimbursement regulations of the German health care system. The cost-effectiveness threshold was identified above which the six-implant solution is preferable over the four-implant solution. Uncertainties regarding input parameters were incorporated via one-way and probabilistic sensitivity analysis based on Monte-Carlo simulation. Results Within a base case scenario of average treatment complexity, the cost-effectiveness threshold was identified to be 17,564 € per year of denture satisfaction gained above of which the alternative with six implants is preferable over treatment including four implants. Sensitivity analysis yielded that, depending on the specification of model input parameters such as patients’ denture satisfaction, the respective cost-effectiveness threshold varies substantially. Conclusions The results of the present study suggest that bar-retained maxillary overdentures based on six implants provide better patient satisfaction than bar-retained overdentures based on four implants but are considerably more expensive. Final judgements about value for money require more comprehensive clinical evidence including patient-centred health outcomes. PMID:25135370

2014-01-01

23

21 CFR 874.3695 - Mandibular implant facial prosthesis.  

Code of Federal Regulations, 2010 CFR

... false Mandibular implant facial prosthesis. 874.3695 Section 874.3695...3695 Mandibular implant facial prosthesis. (a) Identification. A mandibular implant facial prosthesis is a device that is...

2010-04-01

24

Managing dislodged locator from a titanium alloy implant bar in an implant-supported bar overdenture: a clinical report.  

PubMed

An implant-supported prosthesis is a successful treatment option for edentulous patients. This article reports on a case that has not been documented in the literature involving complications in a maxillary implant-supported bar overdenture, followed by the management of the complications. PMID:23649585

Sadid-Zadeh, Ramtin; Junquera, Jessica Isabel; Liu, Perng-Ru

2013-01-01

25

Overdentures on implants placed in bone augmented with fresh frozen bone.  

PubMed

AIM: In the last decade several studies have been performed to evaluate the clinical outcome of one or two stage loaded implants supporting overdentures. Since fresh frozen bone (FFB) has an ever-increasing number of clinical applications and few reports are available on implants inserted into FFB, we performed a retrospective study on fixtures inserted in FFB and bearing overdentures. METHODS: In the period between December 2003 and December 2006, 17 patients (14 females and 3 males with a median age of about 56 years) were grafted and 60 implants inserted thereafter. A total of 17 overdentures were delivered: 8 in the mandible and 9 in the maxilla. Multiple implant systems were used: 22 Double etched, 7 SLA, 9 Anodic oxidized, and 22 CaPo4 ceramic-blasted. Implant diameter ranged from 3.25 to 4.3 mm and length from 11.5 to 16.0 mm. Implants were inserted to replace 23 incisors, 9 cuspids, 20 premolars and 8 molars. RESULTS: No implants were lost (i.e., survival rate=100%) and no differences were detected among the studied variables. Kaplan Meier algorithm and Cox regression did not reveal any statistical differences among the studied variables also as regards the success rate. CONCLUSION: Implants inserted FFB and bearing overdentures have a high survival rate and success rates, which are comparable to those of implants inserted in non-grafted bone. FFB bone is a reliable material for alveolar ridge augmentation. No difference was detected among removable prostheses supported by two or more implants. PMID:21160455

Rigo, L; Viscioni, A; Franco, M; Lucchese, A; Zollino, I; Brunelli, G; Carinci, F

2010-12-15

26

Repair of a fractured implant overdenture gold bar: A clinical and laboratory technique report.  

PubMed

This clinical report explains a convenient, efficient, yet effective alternative for management of fractured substructure cast bars for implant-retained overdentures. The technique allows the fracture to be repaired at low cost and short time without remaking the substructure and the denture and further allowing the patient to keep their denture. The report sketches the clinical and laboratory procedures involved in the repair. PMID:24926222

Vohra, Fahim; Al Fawaz, Amani

2013-07-01

27

A three-appointment alternative treatment protocol for fabricating an implant-supported milled bar overdenture.  

PubMed

This article describes an alternative impression technique for the fabrication of an implant-supported bar overdenture using the duplicated satisfactory interim denture as a custom tray for the implant-level impression. The primary advantage of this technique is that all the information needed for the definitive prosthesis fabrication is obtained from the interim denture and then transferred to the laboratory in a single appointment. However, this technique may be contraindicated for severely misaligned implants that require extensive reduction of the duplicated denture. PMID:22304740

Lin, Wei-Shao; Ozdemir, Erdem; Morton, Dean

2012-02-01

28

Use of short endosseous implants and an overdenture in the extremely resorbed mandible: A five-year retrospective study  

Microsoft Academic Search

Purpose: A retrospective study was performed to assess the success of short endosseous implants in combination with an implant-retained overdenture in the extremely resorbed mandible.Patients and methods: Patients included had a mandible not exceeding a median height of 12 mm measured on a standardized lateral cephalometric radiograph. Seventeen patients (14 women, 3 men; mean age, 65 years) with 68 endosseous

C. Stellingsina; H. J. A. Meijer; G. M. Raghoebar

2000-01-01

29

YOU'RE INVITED... UNLV Narrow Diameter Overdenture Implants 101  

E-print Network

of the University of Pennsylvania. He served as an Attending Staff Dentist, Chief of Restorative Dentistry. Dr. Ingel has interests in both the surgical and restorative aspects if implant dentistry articles related to clinical prosthodontics, implant dentistry, and digital technology with a special

Hemmers, Oliver

30

Implant overdenture impressions using a dynamic impression concept  

PubMed Central

A dynamic impression is a functional impression that records the functional movement of the patient's own muscle and muscle attachment. This process reduces the number of random factors. This article describes a method for making a special tray using a dynamic impression concept that was made from provisional dentures used for implant healing. The individual tray is used to make a wash-impression to record the features of the mucosa in detail. The main advantage of this technique is that it provides a functional relationship of the implant components to the supporting tissues without overextension because provisional denture had been used for 2 months and the border length of individual tray was nearly the same as that of provisional denture. The delivery of the prosthesis constructed using this impression technique is time-saving because there is no need for border molding and there are fewer post-insertion appliance adjustments. PMID:24605209

Lee, Byung-Kil; Park, Sang-Hun; Lee, Cheong-Hee

2014-01-01

31

Implant overdenture using a locator bar system by drill and tapping technique in a mandible edentulous patient: a case report  

PubMed Central

Various options have been introduced for the selection of implant overdenture attachments. Attachment wear due to the repeated insertion and removal of dentures has caused problems such as decreased retention and the requirement for suprastructure remanufacturing. In these cases, a Locator bar system was applied using the drill and tapping technique to achieve total retrievability. In a 55-year-old female patient who showed three degrees of mobility in most of her teeth due to severe alveolar bone loss, a complete denture in the maxilla and an implant supported type overdenture in the mandible were planned after extracting all the remaining teeth. Six implants were placed from canine region to the distal molar region, and the locator was connected to the milled bar using the drill and tapping technique. For a 61-year-old female edentulous patient who complained of poor retention with old denture, a complete denture in the maxilla and an implant-tissue supported type overdenture in the mandible were planned. Four implants were placed in front of mental foramen, and the Locator was also connected to the Hader bar using the drill and tapping technique. With this technique, female parts can be easily replaced, and retention can be continuously maintained. PMID:22737318

Kim, Min-Su; Yoon, Mi-Jung; Huh, Jung-Bo; Jeon, Young-Chan

2012-01-01

32

Single dental implant retained mandibular complete dentures - influence of the loading protocol: study protocol for a randomized controlled trial  

PubMed Central

Background Over the years, there has been a strong consensus in dentistry that at least two implants are required to retain a complete mandibular denture. It has been shown in several clinical trials that one single median implant can retain a mandibular overdenture sufficiently well for up to 5 years without implant failures, when delayed loading was used. However, other trials have reported conflicting results with in part considerable failure rates when immediate loading was applied. Therefore it is the purpose of the current randomized clinical trial to test the hypothesis that immediate loading of a single mandibular midline implant with an overdenture will result in a comparable clinical outcome as using the standard protocol of delayed loading. Methods/design This prospective nine-center randomized controlled clinical trial is still ongoing. The final patient will complete the trial in 2016. In total, 180 edentulous patients between 60 and 89 years with sufficient complete dentures will receive one median implant in the edentulous mandible, which will retain the existing complete denture using a ball attachment. Loading of the median implant is either immediately after implant placement (experimental group) or delayed by 3 months of submerged healing at second-stage surgery (control group). Follow-up of patients will be performed for 24 months after implant loading. The primary outcome measure is non-inferiority of implant success rate of the experimental group compared to the control group. The secondary outcome measures encompass clinical, technical and subjective variables. The study was funded by the Deutsche Forschungsgemeinschaft (German research foundation, KE 477/8-1). Discussion This multi-center clinical trial will give information on the ability of a single median implant to retain a complete mandibular denture when immediately loaded. If viable, this treatment option will strongly improve everyday dental practice. Trial registration The trial has been registered at Deutsches Register Klinischer Studien (German register of clinical trials) under DRKS-ID: DRKS00003730 since 23 August 2012. (http://www.germanctr.de). PMID:24884848

2014-01-01

33

Implant placement above a bifurcated mandibular canal: a case report.  

PubMed

Accurate radiographic assessment of available bone dimension superior to the mandibular canal is essential to the favorable placement of dental implants. Panoramic and periapical radiography are the standard of care. They typically offer a clinically adequate interpretation of the canal topography. However, in about 1% of patients, the mandibular canal may bifurcate. This may or may not be seen on panoramic or periapical films. A case report is presented that uses complex motion tomography as an aid to proper implant placement above a bifurcated mandibular canal. PMID:12271563

Dario, Lawrence J

2002-01-01

34

Assessment of Candida species colonization and denture-related stomatitis in bar- and locator-retained overdentures.  

PubMed

The aim of this study was to assess the prevalence of denture-related stomatitis (DRS) in different attachment-retained overdenture wearers and its association with particular colonizing Candida species. Thirty-seven edentulous patients with implant-supported maxillary or mandibular overdentures were enrolled. A full clinical history was obtained, including details of patients' oral hygiene practices and the levels of erythema based on Newton's classification scale. Swabs were taken from the palate and investigated mycologically to identify the yeast colonies. Quantitative and qualitative microbiological assessments were performed, which included recording the total numbers of colonies (cfu), their color, and their morphological characteristics. Significant differences were found in cfu values between the attachment and inner surfaces of locator- and bar-retained overdentures (P < .05). Candida albicans was the most common species in both evaluations, being isolated from 81.3% of bar-retained overdentures and 38.1% of locator-retained overdentures. DRS developed in all patients using bar-retained overdentures but in only 71.4% of those using locator-retained overdentures. No statistically significant relationship was found between bar and locator attachments according to smoking habit, overnight removal, or plaque and gingival indices (P > .05). PMID:25295886

Kilic, Kerem; Koc, Ayse Nedret; Tekinsen, Fatma Filiz; Yildiz, Pinar; Kilic, Duygu; Zararsiz, Gokmen; Kilic, Erdem

2014-10-01

35

Treatment of a mandibular cyst before implant placement: case report.  

PubMed

The aim of this case study is to present a clinical approach to treatment of a mandibular intrabony cyst employing guided bone regeneration principles and protection of the mandibular nerve prior to implant placement. A treatment approach employing a combination of grafting materials and membranes was used to treat the cyst and protect the mandibular nerve prior to implant placement. Micro CT, as well as histology and histomorphometrics, was used to evaluate treatment outcomes. Histological inspection showed bone regeneration at the grafting site. Histomorphometric analysis of the biopsy core rendered a total bone percent area of 58.87% and 41.13% soft tissue. Out of the total bone percent area, 90.45% was revealed as vital bone and 9.55% was graft remnant. The grafted area is supporting an implant-supported prosthesis in full function. PMID:25219064

Yacker, Miles; Ricci, John; Matei, Ioana Chesnoiu; Hu, Bin; Mamidwar, Sachin

2014-01-01

36

Sensory perception in overdenture patients.  

PubMed

The discussion of overdentures has been confined to their capacity to use abutment teeth to improve neuromuscular control of mandibular movement. Use of overdentures has been favored often because of their mechanical advantages, but seldom because of the sensory role of the retained abutment teeth. Even though the retained teeth may be periodontally diseased, they still may provide sufficient support for the transmission of masticatory pressures and sufficient periodontal ligament receptors to initiate a jaw opening reflex. Whereas conflicting evidence shows that the periodontal nerve receptors play a role in mandibular positional sensibility (proprioception), pressure perception by the periodontal ligament remains a primary stimulus for the jaw opening reflex. Additional investigations will be essential to a complete understanding of the role of the periodontal ligament receptors. However, recognition of the importance of the periodontal ligament receptors to the overdenture patient as a source of sensory input is vital. PMID:1066472

Kay, W D; Abes, M S

1976-06-01

37

Force Transfer and Stress Distribution in an Implant-Supported Overdenture Retained with a Hader Bar Attachment: A Finite Element Analysis  

PubMed Central

Background and Objectives. A key factor for the long-term function of a dental implant is the manner in which stresses are transferred to the surrounding bone. The effect of adding a stiffener to the tissue side of the Hader bar helps to reduce the transmission of the stresses to the alveolar bone. But the ideal thickness of the stiffener to be attached to the bar is a subject of much debate. This study aims to analyze the force transfer and stress distribution of an implant-supported overdenture with a Hader bar attachment. The stiffener of the bar attachments was varied and the stress distribution to the bone around the implant was studied. Methods. A CT scan of edentulous mandible was used and three models with 1, 2, and 3?mm thick stiffeners were created and subjected to loads of emulating the masticatory forces. These different models were analyzed by the Finite Element Software (Ansys, Version 8.0) using von Mises stress analysis. Results. The results showed that the maximum stress concentration was seen in the neck of the implant for models A and B. In model C the maximum stress concentration was in the bar attachment making it the model with the best stress distribution, as far as implant failures are concerned. Conclusion. The implant with Hader bar attachment with a 3?mm stiffener is the best in terms of stress distribution, where the stress is concentrated at the bar and stiffener regions. PMID:24459589

Satheesh Kumar, Preeti; Satheesh, Kumar K. S.; John, Jins; Patil, Geetha; Patel, Ruchi

2013-01-01

38

A functional open-tray impression technique for implant-retained overdenture prostheses.  

PubMed

Several implant impression techniques with different materials have been described in the literature. Generally, border molding, functional, and final impressions have been made with 3 different materials, which makes the procedure technique-sensitive and time-consuming. A combination of open-tray and functional impression techniques is described in this technical report. Border molding and functional impression procedures are made at the same time using a vinyl polysiloxane impression material, which makes this technique a simple and time-efficient alternative for clinicians. PMID:21651416

Ozcelik, Tuncer Burak; Yilmaz, Burak

2012-10-01

39

Strain of implants depending on occlusion types in mandibular implant-supported fixed prostheses  

PubMed Central

PURPOSE This study investigated the strain of implants using a chewing simulator with strain gauges in mandibular implant-supported fixed prostheses under various dynamic loads. MATERIALS AND METHODS Three implant-supported 5-unit fixed prostheses were fabricated with three different occlusion types (Group I: Canine protected occlusion, Group II: Unilaterally balanced occlusion, Group III: Bilaterally balanced occlusion). Two strain gauges were attached to each implant abutment. The programmed dynamic loads (0 - 300 N) were applied using a chewing simulator (MTS 858 Mini Bionix II systems, MTS systems corp., Minn, USA) and the strains were monitored. The statistical analyses were performed using the paired t-test and the ANOVA. RESULTS The mean strain values (MSV) for the working sides were 151.83 µ?, 176.23 µ?, and 131.07 µ? for Group I, Group II, and Group III, respectively. There was a significant difference between Group II and Group III (P < .05). Also, the MSV for non-working side were 58.29 µ?, 72.64 µ?, and 98.93 µ? for Group I, Group II, and Group III, respectively. One was significantly different from the others with a 95% confidence interval (P < .05). CONCLUSION The MSV for the working side of Groups I and II were significantly different from that for the non-working side (Group I: t = 7.58, Group II: t = 6.25). The MSV for the working side of Group II showed significantly larger than that of Group III (P < .01). Lastly, the MSV for the non-working side of Group III showed significantly larger than those of Group I or Group II (P < .01). PMID:21503186

Sohn, Byoung-Sup; Heo, Seong-Joo; Koak, Jai-Young; Kim, Seong-Kyun

2011-01-01

40

An early loaded implant-supported mandibular complete arch fixed prosthesis in a young completely edentulous patient: a case report.  

PubMed

The restoration of the mandibular arch up to the first molars with 5 one-piece implants presents a viable and cost-effective treatment plan in patients with adequate bone volume and favorable ridge relationships. The early loading of the implants with a provisional restoration reduces the period of edentulousness and restores the patient's ability to eat, talk, and smile effectively. Implants in younger patients prevent resorption of the residual alveolar ridge. This article presents a case report of the restoration of an edentulous mandibular arch with an early loaded implant-supported fixed restoration in a young patient. PMID:21905889

Mathew, Miriam; John, Bobby; George, Arun

2013-08-01

41

Mandibular implant-supported fixed dental prosthesis with a modified design: a clinical report.  

PubMed

This clinical report describes the rehabilitation of a patient with a mandibular implant-supported fixed dental prosthesis. Because of the limited restorative space available in the posterior mandible and in considering the higher wear rate of acrylic resin in comparison with titanium when it opposes metal ceramic restorations, the treatment used a milled titanium bar with acrylic resin denture teeth, which replaced the anterior teeth with milled titanium for the posterior occluding surfaces. PMID:24262946

Tourah, Anita; Moshaverinia, Alireza; Chee, Winston W

2014-02-01

42

Change in the width of the mandibular body from 6 to 23 years of age: an implant study.  

PubMed

After the ossification of the mandibular symphysis, shortly after birth, changes in mandibular width would be expected to occur only by surface apposition or resorption on the buccal surfaces of the left and right mandibular halves. However, evidence for an opening hinge movement of the two mandibular halves around a vertical axis located in the region of the mandibular symphysis was recently found in longitudinal studies of 29 subjects with unilateral implant markers in the mandible. These subjects were followed from 8.5 to 15.5 years of age (Korn and Baumrind, 1990; Baumrind and Korn, 1992). The aim of the present investigation was to examine whether the presence of such an age-related increase in mandibular body width could be confirmed in a sample with bilateral implant markers in the mandible. The sample comprised 10 subjects (3F, 7M) from the files of another longitudinal study with implant markers (Björk, 1968). A total of 122 pairs of annual lateral and postero-anterior (p-a) cephalometric records were available, covering longitudinal observation periods ranging from 8 to 16 years within an age interval of between 6 and 23 years. The width between a right and left side mandibular implant marker was measured with digital callipers on all p-a radiographs. Each measurement was corrected mathematically for various sources of radiographic enlargement. A small, but statistically significant increase in the distance between the right and left implant markers, i.e. in the bilateral width of the mandibular body, was observed in all subjects. The total increase in width in each subject ranged from 0.7 to 1.7 mm for the various periods of observation (P < or = 0.01). For the 12-year period from 6 to 18 years, the average total increase was 1.6 mm (P < or = 0.001, SD = 0.42), i.e. 0.13 mm/year. After this age there was no systematic trend. The mechanism for this increase in width is unknown. It is suggested that during postnatal growth, an increasing load from the masticatory occlusal forces might influence endosteal bone remodelling in the mandibular body, thus producing or allowing a gradual permanent outward bending of the right and left mandibular halves. PMID:10920555

I?eri, H; Solow, B

2000-06-01

43

Effects of implant neck design on primary stability and overload in a type IV mandibular bone.  

PubMed

This study investigates the effect of implant neck design on primary stability and overload using 3D finite element analysis. Four commercial dental implants and mandibular segments are created. Various parameters including the osseointegration condition (non-osseointegration and full osseointegration), force direction (vertical and horizontal), and cortical bone thickness (Tc?=?0.3, 0.5, and 1?mm) are considered. The vertical and horizontal forces, 500?N and 250?N, are statically applied at the top of the platform, respectively. Micromotion and von Mises stress are employed to evaluate the risk of osseointegration and bone fatigue before osseointegration condition. After osseointegration, the principal stress is used to analyze the bone overload. Maximal von Mises stress and micromotion of the peri-implant bone decreased as cortical bone thickness increased. Horizontal force induces stress concentration in the bone around the implant neck easier than that of vertical force, and it may result in crestal bone loss. Thinner cortical bone should avoid dental implantation because it causes a noteworthy larger micromotion and stress concentration in cortical bone in particular Tc less than 0.3?mm. Copyright © 2014 John Wiley & Sons, Ltd. PMID:24799197

Chou, I-Chiang; Lee, Shyh-Yuan; Jiang, Cho-Pei

2014-11-01

44

Implant-supported fixed restoration of post-traumatic mandibular defect accompanied with skin grafting: A clinical report  

PubMed Central

Traumatic defects are mostly accompanied by hard and soft tissue loss. This report describes the surgical and prosthetic treatment of a patient with post-traumatic mandibular defect. A split-thickness skin graft was performed prior to implant placement and prefabricated acrylic stent was placed to hold the graft in place. The esthetic and functional demands of the patient were fulfilled by implant-supported screw-retained fixed prosthesis using CAD-CAM technology. PMID:23508120

Noh, Kwantae; Choi, Woo-Jin

2013-01-01

45

Association between the peri-implant bone structure and stress distribution around the mandibular canal: a three-dimensional finite element analysis.  

PubMed

The aim of this study was to elucidate the association between the bone structure at implant insertion sites and stress distribution around the mandibular canal by means of three-dimensional finite element (3D FE) analysis. Four FE models were created with slice data using micro-computed tomography (micro-CT), and 3D FE analysis was performed. Mechanical analysis showed that the load reached the mandibular canal via the trabecular structure in all FE models. High levels of stress were generated around the mandibular canal when the distance between the mandibular canal and the implant decreased. High stress levels were also observed when cortical bone thickness and bone volume/total volume (BV/TV) were low. Our findings suggest that load is transmitted to the mandibular canal regardless of differences in the thickness of cortical bone or cancellous bone structure, but excessive load may be generated in bone with thin cortical and coarse cancellous structures. PMID:23903647

Kinoshita, Hideaki; Nakahara, Ken; Matsunaga, Satoru; Usami, Akinobu; Yoshinari, Masao; Takano, Naoki; Ide, Yoshinobu; Abe, Shinichi

2013-01-01

46

Comparison of Stresses Around Dental Implants Placed in Normal and Fibula Reconstructed Mandibular Models using Finite Element Analysis  

PubMed Central

Purpose: This study was formulated to evaluate and compare stresses around endosseous implants in various normal and fibula reconstructed mandibular models using finite element analysis method. Materials and Methods: CT scan data of a completely edentulous patient and a fibula reconstructed patient was made and the Dicom images were used to design 3-D mandibular models using software. Based on the information from the scan data, various types of reconstructed FEA models were made. Implants (fixtures) and superstructures were then embedded in each model and Von Mises stress around the neck of each implant under a vertical loading of 200 N and Horizontal load of 50 N was calculated using finite element structural analysis software. The results were compared between the reconstructed mandible and their respective normal mandible. Results: Higher stress values were obtained for all the reconstructed types under horizontal loading and in reconstructed models involving larger area of reconstruction the stress were more. In the models involving smaller area of reconstruction like symphysis alone or body alone there is no significant change in the stress values on vertical loading. Conclusion: Stresses were comparatively smaller in mandibles involving a smaller area of reconstruction. Hence, fixed prosthesis could be advised and a bar retained over denture for reconstruction for larger area of reconstruction.

Ariga, Padma

2014-01-01

47

Evaluation of immediately loaded dental implants bioactivated with platelet-rich plasma placed in the mandibular posterior region: A clinico-radiographic study  

PubMed Central

Background and Objectives: The purpose of the present study was to clinically and radiographically assess the soft and hard tissue changes around the immediately loaded single tooth implants bioactivated with platelet-rich plasma (PRP), placed in the mandibular posterior region. Materials and Methods: A total of 11 patients having single tooth edentulous space in the mandibular posterior region were selected. An endosseous implant was placed after clinical and radiographic examination in each selected site using single stage surgical approach. The patients were followed up at 3, 6, 9, and at 12 months of post implant insertion. The patients were subjected to recording of clinical parameters like modified plaque index, modified gingival index, probing depth, and clinical implant mobility scale. Radiographs made at different intervals were subjected to assessment of bone level mesial and distal to each implant using computer assisted image analysis. Results: Scores for clinical parameters were minimal and comparable. The probing depth around the implant was measured during the follow-up period and the changes observed were statistically non-significant. None of the implants were clinically mobile during the follow-up period. Radiographically, the peri-implant bone resorption both on mesial and distal sides was within normal limit after one year of immediate loading. Finally, the overall success rate for the immediately loaded bioactivated implant placed in the mandibular posterior region was recorded as 100%. Interpretation and Conclusion: The use of platelet-rich plasma may lead to improved early bone apposition around the implant; and thus, results in increased rate of osseointegration. Single stage implant procedure with the adjunctive use of PRP enhances the ability of peri-implant healing tissue to create favorable soft and hard tissue relationships. It also gives the added advantage of psychological boost for the patient by getting fixed replacement of tooth within a short time period. PMID:22628970

Anand, Ullas; Mehta, D. S.

2012-01-01

48

The effect of glycine-powder airflow and hand instrumentation on peri-implant soft tissues: a split-mouth pilot study.  

PubMed

Fifteen edentulous patients with overdentures supported by two implants in the mandibular canine regions received periodontal therapy using both hand instrumentation with Teflon curettes and a glycine-based airflow system. Periodontal probing depth (PPD), bleeding on probing (BOP), and bacterial content (BC) within the gingival sulcus were analyzed. A significant effect modification of the glycine airflow with respect to time was found for PPD (P = .01), BOP (P < .001), and BC (P = .004), which were treated as ordered categorical variables. Glycine airflow may be more effective than Teflon curettes for the maintenance of periimplant soft tissues. PMID:23342332

Mussano, Federico; Rovasio, Stefania; Schierano, Gianmario; Baldi, Ileana; Carossa, Stefano

2013-01-01

49

Maxillary and mandibular titanium implants 1 year after surgery: histologic examination in a cadaver.  

PubMed

Nondecalcified histologic sections (from a cadaver) of 12 IMTEC implants in four jaw quadrants 1 year after surgery showed significant osseointegration. Microscopically, no apparent difference was observed in new bone growth and osseointegration in those implants placed in the maxilla or mandible, or between titanium plasma-spray-coated (TPS) implants and TPS-treated implants coated with hydroxyapatite. Areas in which implants were placed through the bony floor of the maxillary sinus showed new bone growth above the normal level of the floor of the sinus around the implants and into mechanical retention holes. Small penetrations of the maxillary sinus membrane or the lingual plate of the mandible did not affect the function of the implants, nor did they cause any symptoms. A vertical component of soft tissue around the cervical part of the osseointegrated implants, noted in histologic sections to be as much as 5 mm below the crest of the alveolar bone in at least one area, was not discernible radiographically even when 5-mm-thick sections of bone containing the implants were radiographed. PMID:7672850

Rohrer, M D; Bulard, R A; Patterson, M K

1995-01-01

50

Mandibular reconstruction with a prefabricated free vascularized fibula and implant-supported prosthesis based on fully three-dimensional virtual planning.  

PubMed

Because optimal reconstruction of maxillofacial defects requires functional rehabilitation, the current study demonstrates the successful secondary reconstruction of a large mandibular continuity defect using a fully digitally planned prefabricated free vascularized fibula with immediate implant-supported prosthodontic restoration. A 56-year-old man presented with a large mandibular continuity defect after resection of an enlarged squamous cell carcinoma arising from the floor of the mouth. For secondary reconstruction, the shape of the neomandible and implant position for support of the lower prosthesis were planned virtually. The combined cutting and drilling guide was printed in 3 dimensions. In a 2-step surgical approach, first, the implants were inserted into the fibula and covered with a split-thickness skin graft to form a neogingiva. In a second operation, the fibula was harvested, osteotomized, and fixed with the denture on the preinserted implants. The fibula was placed to its final position guided by the occlusion. Using three-dimensional virtual backward planning, it was feasible to perform a mandibular reconstruction with immediate prosthetic rehabilitation. PMID:24670276

Freudlsperger, Christian; Bodem, Jens Philipp; Engel, Eva; Hoffmann, Jürgen

2014-05-01

51

Advanced predoctoral implant program at UIC: description and qualitative analysis.  

PubMed

Dental implant education has increasingly become an integral part of predoctoral dental curricula. However, the majority of implant education emphasizes the restorative aspect as opposed to the surgical. The University of Illinois at Chicago College of Dentistry has developed an Advanced Predoctoral Implant Program (APIP) that provides a select group of students the opportunity to place implants for single-tooth restorations and mandibular overdentures. This article describes the rationale, logistics, experiences, and perspectives of an innovative approach to provide additional learning experiences in the care of patients with partial and complete edentulism using implant-supported therapies. Student and faculty perspectives on the APIP were ascertained via focus group discussions and a student survey. The qualitative analysis of this study suggests that the select predoctoral dental students highly benefited from this experience and intend to increase their knowledge and skills in implant dentistry through formal education following graduation. Furthermore, the survey indicates that the APIP has had a positive influence on the students' interest in surgically placing implants in their future dental practice and their confidence level in restoring and surgically placing implants. PMID:24789837

Afshari, Fatemeh S; Yuan, Judy Chia-Chun; Quimby, Anastasiya; Harlow, Rand; Campbell, Stephen D; Sukotjo, Cortino

2014-05-01

52

Paresthesia from an overdenture abutment: report of case.  

PubMed

A case is reported in which paresthesia of the area supplied by the right mental nerve was associated with alveolar ridge resorption and a failing overdenture abutment. After surgical removal of the overdenture abutment, all signs and symptoms of the paresthesia resolved. PMID:6361097

Dale, R A; Amonett, R

1983-12-01

53

Maxillofacial anatomy: the mandibular symphysis.  

PubMed

Placement of dental implants in the anterior mandible is considered by many clinicians to be a relatively low-risk procedure. However, hemorrhagic episodes following implant placement in the mandibular symphysis are regularly reported and can have serious consequences. The use of high-resolution focused cone beam scanners has given us the ability to visualize the intricate neurovascular network of the intraforaminal region without distortion and in greater detail. Knowledge of the arterial supply and navigated implant placement in the mandibular symphysis can help to avoid these potentially life-threatening emergencies. PMID:20932161

Miller, Robert J; Edwards, Warren C; Boudet, Carlos; Cohen, Jonathon H

2011-12-01

54

Reconstruction of the extremely atrophied mandible with iliac crest onlay grafts followed by two endosteal implants: a retrospective study with long-term follow-up.  

PubMed

Treatment outcomes of implant-retained lower dentures on two endosseous implants placed in severely atrophied mandibles after reconstruction with iliac crest onlay grafts were assessed in a retrospective observational study. All consecutive patients treated between 2000 and 2007 were recalled in 2012 (n=40). Survival of the implants, the condition of hard and soft peri-implant tissues, and patient satisfaction were scored. One implant was lost after 5.5 years. The mean mandibular symphysis height was 8.9±2.2, 16.4±2.7, 15.7±2.7, and 15.4±2.5mm at intake, after augmentation, after implantation, and at the last recall visit, respectively. Mean radiographic peri-implant bone loss was 0.6±0.7mm. Mean clinical index scores were very low. Patient satisfaction was high. Surgical complications related to the donor site were seroma (n=1), haematoma (n=2), and sensory disturbance of the lateral femoral cutaneous nerve (n=1); all had resolved before placement of the implants. Eleven patients reported postsurgical sensory disturbances of the mental nerve, of whom five still experienced some sensory disturbance at the last recall visit. Augmentation of the extremely resorbed mandible with an iliac crest onlay graft followed by placement of two implants 4 months later provides a solid basis for a bar-retained overdenture with favourable clinical and radiographic results. PMID:24411276

Boven, G C; Meijer, H J A; Vissink, A; Raghoebar, G M

2014-05-01

55

Functional loads on freestanding and connected implants in three-unit mandibular prostheses opposing complete dentures: an in vivo study.  

PubMed

In vivo measurements of vertical forces and bending moments during biting and chewing were carried out on 10 three-unit prostheses in the posterior mandibles of five patients. Each patient had two prostheses, one supported by two implants and the other supported by one implant and one tooth. The results demonstrated no major difference in functional load magnitudes related to the support type. The distribution of load between the abutments was influenced more by the prosthesis geometry and implant placement than by the difference in load characteristics of tooth and implant. This conclusion, however, is limited to one implant connected to a tooth, because multiple implants form a considerably stiffer unit than do teeth. An increase in vertical load resulting from cantilever extensions on the prostheses was documented, both at bite fork measurements and during chewing. No substantial lateral bending was registered, probably because the flat occlusal surfaces and the presence of the opposing complete denture reduced lateral forces. PMID:9197098

Gunne, J; Rangert, B; Glantz, P O; Svensson, A

1997-01-01

56

An inventory of mandibular fractures associated with implants in atrophic edentulous mandibles: a survey of Dutch oral and maxillofacial surgeons  

Microsoft Academic Search

PURPOSE: The present study provides an inventory of the number of fractures that occurred in conjunction with implant placement in edentulous patients in the Dutch population from 1980 to 2007 and estimates the incidence with which this might occur. The study also sought to define the factors that increase the risk of fracture. MATERIALS AND METHODS: Questionnaires were sent to

A. Soehardi; G. J. Meijer; R. Manders; P. J. W. Stoelinga

2011-01-01

57

Evaluation of crestal bone loss and stability of immediate functional loading versus immediate non-functional loading of single-mandibular posterior implants: A pilot randomized controlled clinical trial  

PubMed Central

Background: The aim of this study is to evaluate and compare the crestal bone loss and stability of single mandibular posterior dental implants placed in immediate functional loading (IFL) and immediate nonfunctional loading (INFL) during 6 months after placement. Materials and Methods: Forty single piece root form titanium implants were placed in 20 patients using IFL and INFL techniques. The change in the level of crestal bone was measured on standardized digital periapical radiographs using SOPRO imaging software and stability of implants using resonance frequency analyser taken at the baseline, 1, 3, and 6 months. The measurements were statistically analyzed using the independent and paired t-test (P < 0.05, statistically significant). Results: The mean change in the crestal bone level from baseline to 6 months was significant in both techniques. The implant stability quotient (ISQ) values at first and third months were lower than those at the baseline for both the groups. However, the ISQ values at the sixth month were similar to baseline for both the groups. The crestal bone changes and the ISQ values when compared between the groups showed no statistically significant difference. Conclusion: IFL of dental implants have equivalent results and success rate as that of immediately provisionalized implants within the limitations of this study.

Mantena, Satyanarayana Raju; Sivagami, G.; Gottumukkala, Sruthima NVS

2014-01-01

58

Transforming Growth Factor-? and Interleukin 10 in Oral Implant Sites in Humans  

Microsoft Academic Search

Cross-talk between cells and cytokines in peri-implant tissue is largely unknown. The immune response in the gingival mucosa appears to favor implant integration over rejection, since titanium-implant-retained overdentures show long-term success. This study evaluates pro-inflammatory (interleukin [IL]-2, interferon [IFN]-?, IL-12) and anti-inflammatory (IL-4, IL-10, transforming growth factor [TGF]-?1) cytokine mRNA expression and tissue morphometry in peri-implant soft tissue from patients

G. Schierano; G. Bellone; E. Cassarino; M. Pagano; G. Preti; G. Emanuelli

2003-01-01

59

An In-Vitro Study Evaluating the Fracture Resistance and Insertion Torque of Self-Drilling Mini-Implants Upon Insertion Into Synthetic High Density Mandibular Bone.  

E-print Network

??Introduction: Self-drilling mini-implants are commonly used in orthodontics, but there is little information regarding their fracture resistance in areas of high density bone without pre-drilling.… (more)

Smith, Angie L

2013-01-01

60

Revised Maxillofacial Anatomy: The Mandibular Symphysis in 3D  

Microsoft Academic Search

Placement of dental implants in the anterior mandible is considered by many clinicians to be a relatively low risk procedure. However, hemorrhagic episodes following implant placement in the mandibular symphysis are regularly reported and can have serious consequences. The use of high resolution focused cone beam scanners has given us the ability to visualize the intricate neurovascular network of the

Robert J. Miller; Warren C. Edwards; Carlos Boudet; Jonathan H. Cohen

61

Root-supported overdentures associated with temporary immediate prostheses--a case-report.  

PubMed

Complete denture fabrication can be a treatment challenge for many dentists, especially when the patient has remaining teeth. So, planning for use of clinical alternatives to improve the treatment prognosis and to enable greater comfort to patient must be considered. This case report describes the use of remaining roots to aid in the stability, support and retention of root-supported overdentures. Thus, immediate prostheses were planned for temporary rehabilitation prior to definitive overdentures. The aim of this study was to demonstrate the planning of root-supported overdentures attached with a ball system for retention associated with immediate dentures between the periods of preparation to fabrication of the definitive overdentures. The proposed treatment met the patient's needs such as being able to carry on normal activities during the sequencing of procedures to be performed over a period of time. The treatment had longevity with patient's knowledge about the necessity of oral hygiene and periodic controls. PMID:24984616

de Souza, Batista Victor Eduardo; de Faria, Almeida Daniel Augusto; Junior Joel Ferreira, Santiago; Gonçales, Verri Ana Caroline; Piza, Pellizzer Eduardo; FellippoRamos, Verri

2014-06-01

62

Three dimensional finite element analysis of the stress distribution around the mandibular posterior implant during non-working movement according to the amount of cantilever  

PubMed Central

PURPOSE In case of large horizontal discrepancy of alveolar ridge due to severe resorption, cantilevered crown is usually an unavoidable treatment modality. The purpose of this study was to evaluate the clinical criteria for the placement of the aforementioned implant crown. MATERIALS AND METHODS The mandible model with 2 mm thick cortical bone and cancellous bone was fabricated from CT cross-section image. An external connection type implant was installed and cantilevered crowns with increasing offset of 3, 4, 5, 6, and 7 mm were connected. Vertical load and 30° oblique load of 300 N was applied and stress around bone and implant component was analyzed. A total of 14 cases were modeled and finite element analysis was performed using COSMOS Works (Solid works Inc, USA). RESULTS As for the location of the vertical load, the maximum stress generated on the lingual side of the implant became larger according to the increase of offset distance. When the oblique load was applied at 30°, the maximum stress was generated on the buccal side and its magnitude gradually decreased as the distance of the offset load increased to 5 mm. After that point, the magnitude of implant component's stress increased gradually. CONCLUSION The results of this study suggest that for the patient with atrophied alveolar ridge following the loss of molar teeth, von-Mises stress on implant components was the lowest under the 30° oblique load at the 5 mm offset point. Further studies for the various crown height and numbers of occusal points are needed to generalize the conclusion of present study.

Park, Ji-Man; Kim, Hyun-Joo; Park, Eun-Jin; Kim, Myung-Rae

2014-01-01

63

Nonsyndromic Mandibular Symphysis Cleft  

PubMed Central

Median cleft of lower lip and mandible is a rare congenital anomaly described as cleft number 30 of Tessier's classification. In minor forms only lower lip cleft is seen. We report the case of a patient with median cleft of lower lip, severe ankyloglossia, cleft of mandibular symphysis, and residual cleft involving on right soft palate and associated with other facial clefts. These deformities were corrected in multiple stage procedure, consisting of release of the tongue from floor of the mouth and lower alveolus and fixation of the mandibular cleft done with right iliac bone graft using stainless steel miniplate. PMID:24711928

Guttikonda, Leela Krishna; Nadella, Koteswara Rao; Uppaluru, Vijayalakshmi; Kodali, Rama Mohan; Nallamothu, Ranganadh

2014-01-01

64

Enteric bacteria mandibular osteomyelitis.  

PubMed

Osteomyelitis of the mandible is a relatively rare inflammatory disease that usually stems from the odontogenic polymicrobial flora of the oral cavity. We are reporting 2 unusual cases of mandibular osteomyelitis resulting from enteric bacteria infection. In one patient, abundant clinical evidence suggested a diagnosis of a chronic factitious disease, whereas in the second patient no obvious etiology was found. PMID:15897844

Scolozzi, Paolo; Lombardi, Tommaso; Edney, Timothy; Jaques, Bertrand

2005-06-01

65

Measuring mandibular motions  

NASA Technical Reports Server (NTRS)

Mandibular motion along three axes is measured by three motion transducers on floating yoke that rests against mandible. System includes electronics to provide variety of outputs for data display and processing. Head frame is strapped to test subject's skull to provide fixed point of reference for transducers.

Dimeff, J.; Rositano, S.; Taylor, R. C.

1977-01-01

66

Mandibular reconstruction in children.  

PubMed

Facial deformities due to loss of mandibular segments in children lead to severe functional and psychological disturbances. Such deformities should be corrected taking into account both contour and function. In addition, they should be planned for long-term growth and performed in the fewest possible surgical stages. This article presents the experience in seven cases of mandibular reconstruction in children after surgical ablation for benign conditions. We performed a scapular flap in one case and fibular flaps in six. The mean age of the patients was 9.1 years. Follow-up ranged from 1.5 to 5 years. All flaps survived. No osseous remodeling was needed in any case. All patients showed symmetrical facial and mandibular growth, as well as adequate masticatory function. Excision of the tumor and reconstruction should be carried out in the same surgical procedure whenever possible. The fibula was used in most cases because of its easy dissection, the ample amount of bone it provides, and the potential to redirect it. The author favors mandibular reconstruction in children with a free flap, as this approach offers adequate form and function in the long term. PMID:10980513

Olvera-Caballero, C

2000-01-01

67

Effect of bar cross-section geometry on stress distribution in overdenture-retaining system simulating horizontal misfit and bone loss.  

PubMed

This study evaluated the influence of cross-section geometry of the bar framework on the distribution of static stresses in an overdenture-retaining bar system simulating horizontal misfit and bone loss. Three-dimensional FE models were created including two titanium implants and three cross-section geometries (circular, ovoid or Hader) of bar framework placed in the anterior part of a severely resorbed jaw. One model with 1.4-mm vertical loss of the peri-implant tissue was also created. The models set were exported to mechanical simulation software, where horizontal displacement (10, 50 or 100 ?m) was applied simulating the settling of the framework, which suffered shrinkage during the laboratory procedures. The bar material used for the bar framework was a cobalt--chromium alloy. For evaluation of bone loss effect, only the 50-?m horizontal misfit was simulated. Data were qualitatively and quantitatively evaluated using von Mises stress for the mechanical part and maximum principal stress and ?-strain for peri-implant bone tissue given by the software. Stresses were concentrated along the bar and in the join between the bar and cylinder. In the peri-implant bone tissue, the ?-strain was higher in the cervical third. Higher stress levels and ?-strain were found for the models using the Hader bar. The bone loss simulated presented considerable increase on maximum principal stresses and ?-strain in the peri-implant bone tissue. In addition, for the amplification of the horizontal misfit, the higher complexity of the bar cross-section geometry and bone loss increases the levels of static stresses in the peri-implant bone tissue. PMID:23791086

Spazzin, Aloísio Oro; Costa, Ana Rosa; Correr, Américo Bortolazzo; Consani, Rafael Leonardo Xediek; Correr-Sobrinho, Lourenço; dos Santos, Mateus Bertolini Fernandes

2013-08-01

68

Indirect method of base adaptation against supporting element of tooth root for a partial overdenture prosthesis.  

PubMed

The base of a partial overdenture prosthesis should be fitted intraorally against the supporting element of a tooth root. Chairside relining is a common method; however, an autopolymerizing acrylic resin presents high porosity when polymerized intraorally. This article describes an indirect method where an impression is made with a silicone occlusion registration material to create a replica of the supporting elements of the residual ridge and the tooth root in a high-viscosity polyvinyl siloxane impression material. PMID:24412183

Oh, Won-suk; Park, Ju-mi

2014-08-01

69

Morphological Features of Peri-Implant Tissue after Placement of Dental Implants into the Extraction Socket  

Microsoft Academic Search

In experiments on pigs, bone regeneration was studied after implantation of implants with four cylindrical roots and support\\u000a cone and laminar crest-shaped implants with shape memory effect. The implants were placed to the extraction socket (mandibular\\u000a canine) and through the socket immediately after tooth extraction using osteoplastic material or without using collapan-L.\\u000a The use of collapan-L accelerated regeneration of peri-implant

M. V. Kotenko; L. L. Meysner

70

Molarization of Mandibular Second Premolar  

PubMed Central

ABSTRACT Macrodontia (megadontia, megalodontia, mac rodontism) is a rare shape anomaly that has been used to describe dental gigantism. Mandibular second premolars show an elevated variability of crown morphology, as are its eruptive potential and final position in the dental arch. To date, only eight cases of isolated macrodontia of second premolars have been reported in the literature. This case report presents clinical and radiographic findings of unusual and rare case of isolated unilateral molarization of left mandibular second premolar. How to cite this article: Mangla N, Khinda VIS, Kallar S, Brar GS. Molarization of Mandibular Second Premolar. Int J Clin Pediatr Dent 2014;7(2):137-139. PMID:25356014

Singh Khinda, Vineet Inder; Kallar, Shiminder; Singh Brar, Gurlal

2014-01-01

71

Conventional prosthodontic management of partial edentulism with a resilient attachment-retained overdenture in a patient with a cleft lip and palate: a clinical report.  

PubMed

Recent advances in surgery and orthodontics have resulted in improvements in the management of patients with a cleft lip or palate. Early surgical intervention and bone-grafting procedures have frequently been used to ensure closure of the cleft and continuity of the alveolar bone. However, a need for the prosthodontic management of patients with a cleft palate still exists. Most frequently, the indication is to restore the edentulous spaces located anteriorly in the vicinity of the residual cleft defect. In addition to improving the esthetic outcome, prosthodontic management also is required to restore function, especially occlusion and speech. This clinical report illustrates the management of an adult patient with a unilateral cleft of the lip and palate who required prosthodontic rehabilitation after surgery. The patient had previously undergone multiple surgeries and did not want to consider implant therapy as a treatment option. Thus, the patient was managed with fixed and removable prosthodontics with a maxillary overdenture prosthesis retained by microextracoronal resilient attachments, which were laser welded onto crowns on abutment teeth to obtain a functionally and esthetically acceptable result. PMID:24529657

Acharya, Varun; Brecht, Lawrence E

2014-08-01

72

Mandibular midline distraction osteogenesis.  

PubMed

In orthodontics, bone structure, its density and dimensions play an essential role by explaining limitations in magnitude, size and extent of tooth movement. Severe anterior crowding is one of the most frequently encountered dental malocclusions. Its therapy is mostly limited by lack of basal and alveolar bone and it often involves tooth extractions. Mandibular midline distraction osteogenesis is a method of natural bone generation and also a treatment option to achieve space regaining in a much-reduced lower jaw with distinctive frontal place deficit and severe anterior crowding, without sacrificing permanent teeth. McCarthy and Guerrero were of the first researchers reporting on this method applied on human lower jaws and they increased clinical interest in this approach. Although this method has been clinically used ever since, many questions concerning effects on bone regeneration speed, bone quality, tooth movement into regenerated area, periodontal health and long-time stability of treatment outcomes have not been sufficiently investigated. This overview should present the current clinical and biological state of knowledge about bone gain and tooth movement through regenerate bone. Furthermore it should encourage interest in further research on this topic. PMID:24390034

Botzenhart, Ute Ulrike; Végh, András; Jianu, Rodica; Gedrange, Tomasz

2013-12-01

73

The role in masseter muscle activities of functionally elicited periodontal afferents from abutment teeth under overdentures.  

PubMed

Five overdenture wearers with a small number of remaining natural teeth were selected to evaluate the effect of the afferent input from periodontal mechanoreceptors on masseter activity in man. As a control, a full denture wearer was included. The subjects were instructed to chew a piece of gum, and/or tap their teeth. Surface EmG from the bilateral masseter muscles were recorded and analysed. When functional pressure was applied, during chewing, to the abutment teeth as well as to mucosa through the denture base, masseter activities were encouraged. Following application of anaesthesia to the periodontal membrane of the abutments, masseter activities were reduced. The duration of the silent period (SP) appearing in the EMG burst following tooth tapping was significantly increased with root support compared to mucosal support only. With topical anaesthesia of the periodontal tissues, SP duration decreased significantly. In conclusion, it has become apparent that the pressure sensibility of abutment teeth bearing functional pressure under an overdenture base is capable of facilitating masseter activity, as one of the sources of oral sensory input during mastication. PMID:7028928

Mushimoto, E

1981-09-01

74

Overwhelming hypercalcaemia in mandibular ameloblastoma.  

PubMed

Ameloblastoma is considered to be a benign odontogenic tumour of epithelial in origin that is slow growing but recurrent and invasive in nature. Some of its features have been sources of debate among experts regarding its benign or malignant character. We report a case of a 20-year-old Filipino woman with right mandibular ameloblastoma presenting with overwhelming hypercalcaemia. Work ups for hypercalcaemia eventually revealed tumoral hypercalcaemia, which was initially controlled with intravenous bisphosphanate. The patient eventually underwent tumour excision and mandibular reconstruction, which totally corrected hypercalcaemia. This case will highlight the rare association of hypercalcaemia among patients with ameloblastoma. PMID:25326561

Lo, Tom Edward Ngo; Villafuerte, Cesar Vincent; Acampado, Laura Trajano

2014-01-01

75

Mandibular development in Australopithecus robustus.  

PubMed

Australopithecus robustus has a distinct mandibular anatomy, with a broad and deep corpus and a tall, relatively upright ramus. How this anatomy arose through development is unknown, as gross mandibular size and shape change have not been thoroughly examined quantitatively in this species. Herein, I investigate A. robustus mandibular growth by comparing its ontogenetic series with a sample of recent humans, examining age-related size variation in 28 linear measurements. Resampling is used to compare the amount of proportional size change occurring between tooth eruption stages in the small and fragmentary A. robustus sample, with that of a more complete human skeletal population. Ontogenetic allometry of corpus robusticity is also assessed with least squares regression. Results show that nearly all measurements experience greater average increase in A. robustus than in humans. Most notably, A. robustus corpus breadth undergoes a spurt of growth before eruption of M1 , likely due in part to delayed resorption of the ramus root on the lateral corpus. Between the occlusion of M1 and M2 , nearly all dimensions experience greater proportional size change in A. robustus. Nested resampling analysis affirms that this pattern of growth differences between species is biologically significant, and not a mere byproduct of the fossil sample size. Some species differences are likely a function of postcanine megadontia in A. robustus, although the causes of other differences are less clear. This study demonstrates an important role of the postnatal period for mandibular shape development in this species. PMID:24820665

Cofran, Zachary

2014-07-01

76

Endodontic treatment of a mandibular canine with two roots.  

PubMed

Lower canine is a tooth with a robust, long root and very good implantation, making it a valuable abutment tooth for any type of prosthetic treatment. In order to treat it conservatively and to prevent its loss from the dental arch it is necessary to accomplish a correct and complete endodontic treatment, which involves knowledge of all its morphological variation. The mandibular canine usually presents one root with a single large canal centrally located. The possible anatomical variations are the existence of a single root with two canals and of two different roots, each having a canal. The incidence of lower canines with two roots is usually low, as described in various studies, but their presence in everyday practice shows that the clinician must consider them if he wants to prevent dental endodontic treatment failure. This article presents a relatively rare case of a patient whose right mandibular canine has two roots and two canals. Although the frequency of mandibular canines with two roots is very low, we must not forget that we can deal with such cases, which can obviously occur even in patients in our country, as the ones described in foreign specialty literature. PMID:21892540

Andrei, Oana Cella; M?rg?rit, Ruxandra; Gheorghiu, Irina Maria

2011-01-01

77

Mandibular reconstruction using stereolithographic 3-dimensional printing modeling technology.  

PubMed

Mandibular reconstruction can be challenging for the surgeon wishing to restore its unique geometry. Reconstruction can be achieved with titanium bone plates followed by autogenous bone grafting. Incorporation of the bone graft into the mandible provides continuity and strength required for proper esthetics and function and permitting dental implant rehabilitation at a later stage. Precious time in the operating room is invested in plate contouring to reconstruct the mandible. Rapid prototyping technologies can construct physical models from computer-aided design via 3-dimensional (3D) printers. A prefabricated 3D model is achieved, which assists in accurate contouring of plates and/or planning of bone graft harvest geometry before surgery. The 2 most commonly used rapid prototyping technologies are stereolithography and 3D printing (3DP). Three-dimensional printing is advantageous to stereolithography for better accuracy, quicker printing time, and lower cost. We present 3 clinical cases based on 3DP modeling technology. Models were fabricated before the resection of mandibular ameloblastoma and were used to prepare bridging plates before the first stage of reconstruction. In 1 case, another model was fabricated and used as a template for iliac crest bone graft in the second stage of reconstruction. The 3DP technology provided a precise, fast, and cheap mandibular reconstruction, which aids in shortened operation time (and therefore decreased exposure time to general anesthesia, decreased blood loss, and shorter wound exposure time) and easier surgical procedure. PMID:19716728

Cohen, Adir; Laviv, Amir; Berman, Phillip; Nashef, Rizan; Abu-Tair, Jawad

2009-11-01

78

Management of unilaterally deep impacted first, second, and third mandibular molars.  

PubMed

Simultaneous impactions of first, second, and third permanent molars comprises a very rare clinical situation with diverse therapeutic approaches and is a difficult challenge for dentists. Early diagnosis and treatment of eruption disturbances contributes to optimal outcomes. This article reports the treatment of a teenager with severe impaction of right mandibular first, second, and third molars, which hinders the masticatory function and dental arch integrity. A decision-making process and a simple orthodontic technique are described. To shorten the treatment time and simplify the procedures, the impacted right mandibular third and second molars were orthodontically uprighted with an innovative tip-back cantilever. Subsequently, the deeply impacted right mandibular first molar was extracted with minimal obstacles. The combined surgical-orthodontic approach resolved a challenging clinical problem and eliminated the need for prosthetic or dental implant replacement of the impacted molars. Good occlusion, normal function, and a healthy periodontium of the patient were also achieved. PMID:21988519

Fu, Po-Sung; Wang, Jen-Chyan; Chen, Cheng-Hwei; Huang, Ta-Ko; Tseng, Chin-Huang; Hung, Chun-Cheng

2012-05-01

79

A clinical and histological evaluation of titanium mini-implants as anchors for orthodontic intrusion in the beagle dog  

Microsoft Academic Search

The aim of this study was to determine the anchorage potential of the titanium mini-implant for orthodontic intrusion of the mandibular posterior teeth. Six mini-implants were surgically placed around the mandibular third premolars on each side in 3 adult male beagle dogs. On the buccal site, three mini-implants were placed distal to the apex of the distal root of the

Masami Ohmae; Shigeru Saito; Tomio Morohashi; Kenji Seki; Hong Qu; Ryuzo Kanomi; Ken-ichi Yamasaki; Tomohiro Okano; Shoji Yamada; Yoshinobu Shibasaki DDS

2001-01-01

80

Mandibular nerve entrapment in the infratemporal fossa  

Microsoft Academic Search

The posterior trunk of the mandibular nerve (V3) comprises of three main branches. Various anatomic structures may entrap and potentially compress the mandibular nerve branches.\\u000a A usual position of mandibular nerve (MN) compression is the infratemporal fossa (ITF) which is one of the most difficult\\u000a regions of the skull base to access surgically. The anatomical positions of compression are: the

Maria N. PiagkouT; T. Demesticha; G. Piagkos; G. Androutsos; P. Skandalakis

2011-01-01

81

21 CFR 872.4770 - Temporary mandibular condyle reconstruction plate.  

...AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL...that is intended to stabilize mandibular bone and provide for temporary reconstruction...of the mandibular condyle and mandibular bone. This device is not intended for...

2014-04-01

82

21 CFR 872.3960 - Mandibular condyle prosthesis.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Mandibular condyle prosthesis. 872.3960 Section 872.3960... § 872.3960 Mandibular condyle prosthesis. (a) Identification. A mandibular condyle prosthesis is a device that is intended to...

2010-04-01

83

BMP-2 impregnated biomimetic scaffolds successfully induce bone healing in a marginal mandibular defect  

PubMed Central

Educational Objective: To investigate the ability of an osteoconductive scaffold to heal a clinically common mandibular defect with BMP-2 in an animal model. Objectives: To test the osteoregenerative potential and dosing of bone morphogenetic protein-2 (BMP-2) impregnated biomimetic scaffolds in a rat model of a mandibular defect. Study Design: Prospective study using an animal model. Methods: Varied doses of BMP-2 (0.5, 1, 0.5 and 0.5 in microspheres, 5, 15 ?g) were absorbed onto a biomimetic scaffold. Scaffolds were then implanted into marginal mandibular defects in rats. Blank scaffolds and unfilled defects were used as negative controls. Two months postoperatively, bone healing was analyzed with micro-computerized tomography (microCT). Results: MicroCT analysis demonstrated all doses of BMP-2 induced successful healing of marginal mandibular defects in a rat mandible. Increasing doses of BMP-2 on the scaffolds produced increased tissue healing with 15 ?g demonstrating significantly more healing than all other dosing (p < 0.01). Conclusions: BMP-2 impregnated biomimetic scaffolds successfully induce bone healing in a marginal mandibular defect in the rat. Percentage healing of defect, percentage of bone within healed tissue and total bone volume are all a function of BMP-2 dosing. There appears to be an optimal dose of 5 ?g beyond which there is no increase in bone volume. PMID:23553490

DeConde, Adam S.; Sidell, Douglas; Lee, Min; Bezouglaia, Olga; Low, Kyle; Elashoff, David; Grogan, Tristan; Tetradis, Sotirios; Aghaloo, Tara; John, Maie St.

2014-01-01

84

[Importance of form in dental implantation].  

PubMed

Thirteen implantations have been made in the mandibular arches of 6 dogs. They consisted of commerical titanium blades and screws and of replicas of extracted dental roots variously shaped and made of titanium. All replicas and some of the commerical implantations were covered with pure aluminium using the plasmajet tecnique. Clinico-radiological, histopathological and microradiographical observation showed that only some of the replicas of dental roots give promising results. PMID:277758

Cini, L; Gasparini, F; Michieli, S; Pizzoferrato, A; Sandrolini Cortesi, S

1978-01-01

85

Influence of Abutment Design on Clinical Status of Peri-Implant Tissues  

Microsoft Academic Search

Objective: To compare the clinical soft tissue responses around implant tooth-supported 3-unit bridges using tapered abutments with those using butt-joint abutments. Methods: In a split-mouth design study, 8 mm Ankylos (Dentsply Friadent, Germany) implants were placed in the second mandibular molar region of 8 adult Macaca fascicularis monkeys about I month after extraction of all mandibular molars. After 3 months

T. B. Taiyeb-Ali; C. G. Toh; C. H. Siar; D. Seiz; S. T. Ong

2009-01-01

86

Solitary osteochondroma of the mandibular symphysis  

Microsoft Academic Search

Osteochondroma is a benign neoplasm that usually develops in long bones and very rarely occurs in craniofacial bones. Nearly all reported mandibular osteochondromas have arisen in the condyle and the coronoid process, and occurrence in other locations is extremely rare. We describe a case of osteochondroma arising from the inferior border of the mandibular symphysis.

E Tanaka; S Iida; H Tsuji; M Kogo; M Morita

2004-01-01

87

Treatment of a Class II Division 2 malocclusion with space reopening for a single-tooth implant  

Microsoft Academic Search

This case report describes the treatment of an adolescent girl with a skeletal Class II Division 2 malocclusion and impinging overbite. One of 2 previously extracted premolars had to be replaced by a single-tooth implant after adequate space reopening. An optimal overbite-overjet relationship was achieved through significant intrusion and proclination of maxillary and mandibular incisors. A horizontally impacted mandibular second

Roy Sabri

2001-01-01

88

Modification of mandibular ridge splitting technique for horizontal augmentation of atrophic ridges  

PubMed Central

Purpose: A two stage approach of ridge splitting and lateral expansion in the mandible to achieve enough bone width for the purpose of dental implants is presented. Materials and Methods: A total of 13 consecutive patients with 16 long-span edentulous areas of the mandibular ridge were included in this study and 42 dental implants were inserted. Corticotomy of a rectangular buccal segment was carried out followed by 3 weeks of recovery; the mandibular ridge was stretched laterally, leaving the buccal periosteum attached to the lateralized segment. In this modification, there was no need for the use of grafted foreign materials to fill the defect and neither the use of barrier membranes, since it was treated practically as a fresh extraction site. To prevent the undesirable movement of the lateral plate, a small chip (2-3 mm in diameter) of bone spacer was properly fixed. The dental implants were placed 3-5 months later on. Results: Approximately, 86% of the expanded areas were successful in providing an adequate width to accommodate an implant. The average gain in width was 3.22 ± 0.97 mm. All intended implants were inserted. Prosthetic loading with fixed prosthesis was successfully implemented in all cases. Conclusion: This modified technique is a simple and short procedure with satisfactory results and minimal morbidity. Of note, this approach is devoid of foreign materials usage and has a low rate cost, therefore, should be employed more often. PMID:24987593

Abu Tair, Jawad A.

2014-01-01

89

Treatment of recurrent mandibular ameloblastoma  

PubMed Central

Ameloblastoma is a locally invasive benign odontogenic tumor with a high rate of recurrence in the long term. The authors conducted a retrospective study of patients with mandibular ameloblastoma in order to evaluate recurrent ameloblastoma management. The study included data from 31 patients over a period of 10 years. Data collected included age, gender, tumor location, histological findings, initial treatment, number of recurrences and year of onset, type of treatment of recurrence, reconstruction and follow-up. Recurrences were detected in nine patients (29%). Tumor recurrences appeared at 32 months on average following the initial surgical procedure. Recurrences were associated mainly to inadequate initial therapeutic approach and were treated by bone resection with a safety margin of at least 1 cm beyond the radiographically visible margins. Immediate reconstruction of bone defects was performed with grafts or free flaps. PMID:24137230

INFANTE-COSSIO, PEDRO; PRATS-GOLCZER, VICTORIA; GONZALEZ-PEREZ, LUIS-MIGUEL; BELMONTE-CARO, RODOLFO; MARTINEZ-DE-FUENTES, RAFAEL; TORRES-CARRANZA, EUSEBIO; GACTO-SANCHEZ, PURIFICACION; GOMEZ-CIA, TOMAS

2013-01-01

90

Experience And Results With Preoperatively Shaped AO Mandibular Reconstruction Plates  

NASA Astrophysics Data System (ADS)

As a rule continuous bony defects of the mandible after tumour resection are temporarily bridged with the AO reconstruction plate. To precontour the plate, CT-scans of the mandible at a scale of 1:1 6 mm above and parallel to the inferior margin are needed. Corresponding layers further cranial show the anatomy of the chin. Using a lateral cephalograph, the mandibular angle and the length of the plate in the ascending ramus are measured. Of the 19 preshaped reconstruction plates implanted, 11 did not need any intraoperative adjustment of shape. The other 8 plates needed only slight modifications of contour. Preoperative bending of the reconstruction plate reduces the time taken for the operation, protects the material and the plate is precisely shaped.

Reuters, Ulrich; Prein, Joachim; Muller, Werner

1989-04-01

91

Cochlear Implants  

MedlinePLUS

... Need to Know Before, During, & After Implant Surgery Recalls and Safety Cochlear Implants View movie of the ... cochlear implants, and provide news about cochlear implant recalls and safety issues. You can find information here ...

92

Removable partial denture supported by implants with prefabricated telescopic abutments - a case report.  

PubMed

Implants have been designed to rehabilitate edentulous patients with fixed prosthesis or implant supported overdentures. Implant-supported single crowns and fixed partial dentures have become successful treatment alternatives to removable and fixed partial dentures. However, it is common to have clinical situations which make it impossible to use conventional as well as implant supported fixed partial dentures. The implant supported removable partial dentures can be a treatment modality that offers the multitude of benefits of implant-based therapy-biologic, biomechanical, social, and psychological to such patients. The aim of this article is to present a case report describing the fabrication and advantages of removable partial denture supported by teeth and implants for a patient with long edentulous span. The patient was satisfied with his dentures in terms of function and aesthetics. Regular follow-up visits over a period of three years revealed that the periodontal condition of remaining natural dentition and peri-implant conditions were stable. There was no evidence of excessive residual ridge resorption or mobility of the teeth, nor were any visible changes in the bone levels of the natural teeth or implants noted on radiographs. PMID:25121066

Kumar, Lalit; Sehgal, Komal

2014-06-01

93

A 48-month multicentric clinical investigation: implant design and survival.  

PubMed

This report is based on a total of 2,955 implants of 6 different designs, randomized and placed in 829 patients and followed for 48 months. Implant failure was defined as nonintegration at uncovering or removal due to mobility, persistent pain, infection, and evidence of radiographic bone loss. Failures were reported for 3 phases of treatment: implant placement to uncovering (phase 1), uncovering to loading (phase 2), and postloading (phase 3). Differences in survival were compared with Kaplan-Meier survival curves. The maxillary single tooth application resulted in 95.2% survival for the hydroxyapatite-coated grooved implants. In the maxillary completely edentulous application, survival of hydroxyapatite grooved and screw implants were considerably better compared with the titanium screw implants. The hydroxyapatite-coated cylinder had better survival than the titanium basket and screw designs in the mandibular completely edentulous application. The hydroxyapatite-coated cylinder and grooved implants in the maxillary posterior partially edentulous application had similar survival rates. The survival of the hydroxyapatite-coated cylinder exceeded that of the titanium basket in mandibular posterior partially edentulous applications. Analyses by phase of treatment indicated a pattern of early failure for nonhydroxyapatite-coated implants compared with hydroxyapatite-coated implants. The implant with the highest survival at all phases of treatment was the hydroxyapatite-coated press-fit cylinder. Two hydroxyapatite-coated implant designs performed well in the challenging posterior maxillary region. PMID:12500876

Morris, H F; Winkler, S; Ochi, S

2001-01-01

94

Nonsurgical correction of a Class III malocclusion in an adult by miniscrew-assisted mandibular dentition distalization.  

PubMed

This article reports the successful use of miniscrews in the mandible to treat a 20-year-old Mongolian woman with a chief complaint of anterior crossbite. The patient had a skeletal Class III malocclusion with a mildly protrusive mandible, an anterior crossbite, and a deviated midline. In light of the advantages for reconstruction of the occlusal plane and distal en-masse movement of the mandibular arch, we used a multiloop edgewise archwire in the initial stage. However, the maxillary incisors were in excessive labioversion accompanied by little retraction of the mandibular incisors; these results were obviously not satisfying after 4 months of multiloop edgewise archwire treatment. Two miniscrews were subsequently implanted vertically in the external oblique ridge areas of the bilateral mandibular ramus as skeletal anchorage for en-masse distalization of the mandibular dentition. During treatment, the mandibular anterior teeth were retracted about 4.0 mm without negative lingual inclinations. The movement of the mandibular first molar was almost bodily translation. The maxillary incisors maintained good inclinations by rotating their brackets 180° along with the outstanding performance of the beta-titanium wire. The patient received a harmonious facial balance, an attractive smile, and ideal occlusal relationships. The outcome was stable after 1 year of retention. Our results suggest that the application of miniscrews in the posterior area of the mandible is an effective approach for Class III camouflage treatment. This technique requires minimal compliance and is particularly useful for correcting Class III patients with mild mandibular protrusion and minor crowding. PMID:23726338

Jing, Yan; Han, Xianglong; Guo, Yongwen; Li, Jingyu; Bai, Ding

2013-06-01

95

Alveolar nerve repositioning with rescue implants for management of previous treatment. A clinical report.  

PubMed

The goal of modern implant dentistry is to return patients to oral health in a rapid and predictable fashion, following a diagnostically driven treatment plan. If only a limited number of implants can be placed, or some fail and the prosthetic phase of implant dentistry is chosen to complete the patient's treatment, the final outcome may result in partial patient satisfaction and is commonly referred to as a "compromise." Previous All-on-4 implant treatment for the patient presented here resulted in a compromise, with an inadequate support system for the mandibular prosthesis and a maxillary complete denture with poor esthetics. The patient was unable to function adequately and also was disappointed with the resulting appearance. Correction of the compromised treatment consisted of bilateral inferior alveolar nerve elevation and repositioning without bone removal for lateral transposition, to gain room for rescue implants for a totally implant-supported and stabilized prosthesis. Treatment time to return the patient to satisfactory comfort, function, facial esthetics, and speech was approximately 2 weeks. The definitive mandibular prosthesis was designed for total implant support and stability with patient retrievability. Adequate space between the mandibular bar system and the soft tissue created a high water bridge effect for self-cleansing. Following a short interim mandibular healing period, the maxillary sinuses were bilaterally grafted to compensate for bone inadequacies and deficiencies for future maxillary implant reconstruction. PMID:23924033

Amet, Edward M; Uehlein, Chris

2013-12-01

96

Efficacy of 3-Dimensional plates over Champys miniplates in mandibular anterior fractures  

PubMed Central

Background: Mandibular fractures are treated surgically by either rigid or semi-rigid fixation, two techniques that reflect almost opposite concept of craniomaxillofacial osteosynthesis. The shortcomings of these fixations led to the development of 3 dimensional (3D) miniplates. This study was designed with the aim of evaluating the efficiency of 3D miniplate over Champys miniplate in anterior mandibular fractures. Materials & Methods: This study was done in 40 patients with anterior mandibular fractures. Group I consisting of 20 patients in whom 3D plates were used for fixation while in Group II consisting of other 20 patients, 4 holes straight plates were used. The efficacy of 3D miniplate over Champy’s miniplate was evaluated in terms of operating time, average pain, post operative infection, occlusion, wound dehiscence, post operative mobility and neurological deficit. Results: The mean operation time for Group II was more compared to Group I (statistically significant).There was significantly greater pain on day of surgery and at 2nd week for Group II patients but there was no significant difference between the two groups at 4th week. The post operative infection, occlusal disturbance, wound dehiscence, post operative mobility at facture site, neurological deficit was statistically insignificant (chi square test). Conclusion: The results of this study suggest that fixation of anterior mandibular fractures with 3D plates provides three dimensional stability and carries low morbidity and infection rates. The only probable limitation of these 3D plates may be excessive implant material, but they seem to be easy alternative to champys miniplate. How to cite the article: Barde DH, Mudhol A, Ali FM, Madan RS, Kar S, Ustaad F. Efficacy of 3-Dimensional plates over Champys miniplates in mandibular anterior fractures. J Int Oral Health 2014;6(1):20-6. PMID:24653598

Barde, Dhananjay H; Mudhol, Anupama; Ali, Fareedi Mukram; Madan, R S; Kar, Sanjay; Ustaad, Farheen

2014-01-01

97

Reconstruction of severely atrophic jaws using homografts and simultaneous implant placement: a retrospective study.  

PubMed

In the past decade, several investigators have reported that implants inserted in autografts in the same operation (ie, simultaneously inserted implants [SIIs]) have achieved excellent results. However, no report regarding SIIs placed in fresh frozen bone (FFB) is available. Thus, the authors planned a retrospective study on a series of SIIs placed in homologue FFB (but not immediately loaded) to evaluate their clinical outcome. In addition, a comparison with implants inserted in FFB in a second stage (ie, delayed inserted implants) was performed. Seventeen patients were grafted with FFB, and 48 implants were inserted in the same operation. Implant diameter and length ranged from 3.25 to 4.0 mm and from 10.0 to 15 mm, respectively. Data were compared with 302 implants inserted in FFB in a second operation during the same period in 64 patients. Analyzing SIIs, it was noted that only 3 implants were lost (ie, survival rate [SVR] = 93.7%), and no differences were detected among the studied variables by using lost implants as a predictor of clinical outcome. On the contrary, by using crestal bone resorption around the implant's neck and specific cutoff values, it was possible to demonstrate that prosthetic restoration (ie, removable overdentures) correlated with a statistically significant lower delta insertion abutment junction (ie, reduced crestal bone loss) and thus with a better clinical outcome. By comparing SIIs with implants inserted in a second stage in FFB, a better outcome for delayed implants was demonstrated. Implants inserted simultaneously with FFB grafts had a high survival and success rate. SIIs inserted in FFB can be considered reliable devices, although a higher marginal bone loss is to be expected when fixed prosthetic restorations are used. Implants inserted in a second surgical stage have a better SVR and success rate than SIIs. PMID:20426590

Viscioni, Alessandro; Rigo, Leone; Franco, Maurizio; Brunelli, Giorgio; Avantaggiato, Anna; Sollazzo, Vincenzo; Carinci, Francesco

2010-01-01

98

Population-based design of mandibular fixation plates with bone quality and morphology considerations.  

PubMed

In this paper we present a new population-based implant design methodology, which advances the state-of-the-art approaches by combining shape and bone quality information into the design strategy. The method may enhance the mechanical stability of the fixation and reduces the intra-operative in-plane bending which might impede the functionality of the locking mechanism. The computational method is presented for the case of mandibular locking fixation plates, where the mandibular angle and the bone quality at screw locations are taken into account. The method automatically derives the mandibular angle and the bone thickness and intensity values at the path of every screw from a set of computed tomography images. An optimization strategy is then used to optimize the two parameters of plate angle and screw position. The method was applied to two populations of different genders. Results for the new design are presented along with a comparison with a commercially available mandibular locking fixation plate (MODUS(®) TriLock(®) 2.0/2.3/2.5, Medartis AG, Basel, Switzerland). The proposed designs resulted in a statistically significant improvement in the available bone thickness when compared to the standard plate. There is a higher probability that the proposed implants cover areas of thicker cortical bone without compromising the bone mineral density around the screws. The obtained results allowed us to conclude that an angle and screw separation of 129° and 9 mm for females and 121° and 10 mm for males are more suitable designs than the commercially available 120° and 9 mm. PMID:23053302

Bousleiman, Habib; Iizuka, Tateyuki; Nolte, Lutz-Peter; Reyes, Mauricio

2013-02-01

99

Long Term Stability and Relapse Following Mandibular Advancement and Mandibular Setback Surgeries: A Cephalometric Study  

PubMed Central

Background: The aim was to evaluate the long-term hard and soft tissue changes following mandibular advancement and setback surgeries. Materials and Methods: A total of 16 subjects each were selected who underwent bilateral sagittal split osteotomy mandibular advancement and mandibular setback groups. Pre-surgical (T1), immediate post-surgical (T2) and long-term post-surgical (T3) cephalograms were compared for hard and soft tissue changes. After cephalometric measurements, the quantity of changes between T1-T2 and T1-T3 were determined for each patient. The mean difference between T1-T2 and T1-T3 was compared with assess the long-term changes and stability. Results: In mandibular advancement the mean difference between immediate post-surgical and long term post-surgical is 7%, which accounts for a relapse of 7%. In mandibular setback, the mean difference between immediate post-surgical and long-term post-surgical is 29%, which accounts for a relapse of 29%. Conclusion: Mandibular advancement remained stable over the long period when compared to mandibular setback.

Darshan, S Vinay; Ronad, Yusuf Ahammed; Kishore, M S V; Shetty, K Sadashiva; Rajesh, M; Suman, S D

2014-01-01

100

[Morphological alterations of oto-mandibular syndromes].  

PubMed

Otomandibular dysplasia is a congenital malformation defined by a certain degree of temporomandibular or pterygomandibular hypoplasia. The syndrome is characterised by the variability of clinical findings, but the three major features are auricular, mandibular and maxillary hypoplasia. All the laterofacial structures may be affected. The deformity is usually unilateral but bilateral cases exist; a lot of associated malformations have been described. Multiple classification systems have been published. Some of them are very complex, but it is possible to define a simple diagnostic diagram based on ethiopathogenic data. Bilateral involvement affects predominantly the zygoma, and concerns hereditary syndromes. When the mandibular hypoplasia is evident Franceschetti or Goldenhar syndrome is suspected; otherwise Treacher-Collins syndrome is probable. Unilateral cases are not, in general, hereditary and the hypoplasia predominates on the mandible. The difference between hemifacial microsomia or mandibular dysplasia is made by the presence of associated laterofacial deformities. PMID:11770456

Bettega, G; Morand, B; Lebeau, J; Raphaël, B

2001-10-01

101

The mandibular response in Class II malocclusions correction.  

PubMed

The "mandibular response" is pursued in treatment of Class II malocclusions by mandibular retrusion. The keys for correction of Class II malocclusion--in addition to a favorable natural growth--are differential diagnosis and a carefully monitored force system to allow a good dental movement and a satisfactory mandibular replacement. PMID:22031992

Cordua, Teresa; Deli, Roberto; Giuliante, Luca; Ursini, Roberto

2011-01-01

102

Designing a transmandibular implant with the aid of biostereometric analysis  

Microsoft Academic Search

A biostereometric survey of severely resorbed dry mandibles was used to determine whether it was possible to design a transmandibular implant that could be used for the majority of clinical situations. Computerized profiles of the relevant mandibular areas were generated and superimposed to examine the feasibility of a universal shape. It would appear that the crestal shape of the mandible

Hannes T Potgieter; Con H Jooste; Laurie P Adams

1996-01-01

103

Mandibular pyogranulomatous osteomyelitis in a Sannen goat.  

PubMed

Mandibular pyogranulomatous osteomyelitis was diagnosed in a female Sannen goat. The doe presented for difficulty prehending and chewing food. The left mandible was swollen and firm on palpation. Radiographs revealed changes consistent with osteomyelitis of the affected mandible. Arcanobacterium pyogenes was isolated from aspirates of swollen mandible. Despite antimicrobial therapy, the goat died. Histopathological findings were consistent with pyogranulomatous disease of the affected mandible. The histopathological findings were similar to those reported for actinomycosis, caused by Actinomyces bovis. Mandibular osteomyelitis is a common condition in cattle and very rare in goat. PMID:12948160

Seifi, H A; Saifzadeh, S; Farshid, A A; Rad, M; Farrokhi, F

2003-05-01

104

Studies of mandibular movements in speech.  

PubMed

A method of transducing mandibular movements in speech using synchro-transmitters is described. Incisal occlusion was shown to have an important part to play in the amount and direction of jaw movement. Mandibular positions were shown to be precise and repeatable, especially for the 's' sound. Insertion of intra-oral appliances of varying dimensions did not have a significant effect on this positional precision. It is anticipated that the precision of vertical dimension determination during full denture construction will not be influenced by the dimensions of the intra-oral appliances. PMID:1059645

Geissler, P R

1975-11-01

105

CAD/CAM and rapid prototyped titanium for reconstruction of ramus defect and condylar fracture caused by mandibular reduction.  

PubMed

Fracture or defect of the mandible is a serious complication of mandibular angleplasty, and precise reconstruction for such defect is still a huge challenge. This case report provides a new method based on CAD/CAM and rapid prototyped titanium for individual design, fabrication, and implantation of a mandibular ramus and angle. A 25-year-old woman with a square-shaped face, who had undergone mandibular outer cortex split ostectomy (MOCSO) 3 months earlier, was afflicted by a series of symptoms: asymmetric face, collapse of the right face, masticatory problems, deviation during mouth opening, malocclusion, and TMJ clicks. These symptoms were caused by unintentional removal of the fractured ramus during MOCSO. By means of CT scan data, rapid prototyping, reverse engineering, 3D display, and CAD/CAM, the individualized titanium implant was designed and fabricated. The 3D demo system of operative scheme demonstrated the operative procedure, and determined the position of the implant so as to obtain a perfect fit. Postoperatively, the patient regained satisfactory morphologic symmetry, facial appearance, occlusion, and TMJ functions. PMID:22676828

Wang, Guosong; Li, Jihua; Khadka, Ashish; Hsu, Yuchun; Li, Wenyang; Hu, Jing

2012-03-01

106

Mandibular contouring surgery for purely aesthetic reasons  

Microsoft Academic Search

The mandible's contour determines the shape of the lower part of the face and thus influences the appearance of the face and neck. There are two types of operative procedures that can be used on mandibular contour and they do not require orthodontic treatment: mandible angle reduction and genioplasty. We divided the mandible angle reduction group into Types A, B,

Doo Byung Yang; Chul Gyoo Park

1991-01-01

107

Mandibular dimensional changes and skeletal maturity  

PubMed Central

Aim: Growth and development of the human face provides a fascinating interplay of form and function. Among the various facial bones, the mandible plays a very important role during various growth-modification therapies. These treatment modalities will yield a better result in less time if properly correlated with skeletal maturity. It is very essential to know where the site of growth occurs and also the time when it occurs or ceases to occur. This study was conducted to assess the mandibular dimensions at various stages of skeletal maturation. Materials and Methods: The subjects included 6 to 18-year-old children who were grouped according to their middle phalanx of the third finger stages of skeletal maturity. Lateral cephalographs were taken and, from their cephalometric tracings, linear and angular measurements of the mandible were made. The values obtained were subjected to statistical analysis. Results: Results showed that the mandibular height, length and symphysis thickness increased with skeletal maturity. An increase in angles SNB (Sella, Nasion, Supramentale) and L1-MP (Long axis lower incisors- Mandibular plane) and a decrease in the gonial angle and ANB (Subspinale, Nasion, Supramentale) angle were observed. Conclusion: The study showed a significant correlation between mandibular growth and skeletal maturity. PMID:22114424

Subramaniam, Priya; Naidu, Premila

2010-01-01

108

Mandibular teeth in Chalcidoidea: function and phylogeny  

Microsoft Academic Search

Aphelinidae and Encyrtidae (Hymenoptera: Chalcidoidea) were surveyed for presence of a specialized ventroapical mandibular tooth that is formed through modification of a seta into a stout socketed spine. An almost identical tooth is found in a homologous position in Coccophaginae (Aphelinidae), Eriaphytinae (Aphelinidae), Calesinae (Aphelinidae or incertae sedis), and Habrolepidini (Encyrtidae), but nowhere else within Chalcidoidea. Although the tooth represents

John M. Heraty; Mike E. Schauff

1998-01-01

109

Mandibular advancement devices and seep disordered breathing  

Microsoft Academic Search

It has been nearly 90 years since a dentist first fabricated a dental appliance for a patient with snoring. Since then, mandibular advancement devices or MADs have become a common treatment for obstructive sleep apnea and are used to increase the caliber of the airway during sleep. Their primary use is for the patient who has snoring or mild to

Glenn T. Clark

1998-01-01

110

Orthodontic extrusion of horizontally impacted mandibular molars  

PubMed Central

Objective: To introduce and evaluate a novel approach in treating horizontally impacted mandibular second and third molars. Materials and methods: An orthodontic technique was applied for treatment of horizontally impacted mandibular second and third molars, which included a push-type spring for rotation first, and then a cantilever for extrusion. There were 8 mandibular third molars (M3s) and 2 second molars (M2s) in this study. Tooth mobility, extraction time, the inclination and parallelism of the impacted tooth, alveolar bone height of the adjacent tooth, and the relationship of impacted M3 and the inferior alveolar nerve (IAN) were evaluated. Results: Two horizontally impacted M2s could be upright in the arch and good occlusal relationships were obtained after treatment. All impacted M3s were successfully separated from the IAN, without any neurologic consequences. The average extraction time was 5 minutes. There was a significant change in the inclination and parallelism of the impacted tooth after treatment. A new bone apposition with the average height of 3.2 mm was noted distal to the adjacent tooth. Conclusions: This two-step orthodontic technique as presented here may be a safe and feasible alternative in management of severely horizontally impacted mandibular molars, which achieves a successful separation of M3s from the IAN and an excellent position for M2s.

Ma, Zhigui; Yang, Chi; Zhang, Shanyong; Xie, Qianyang; Shen, Yuqing; Shen, Pei

2014-01-01

111

Case studies on implant removal influencing the resolution of inferior alveolar nerve injury  

Microsoft Academic Search

Introduction Nerve injury during implant placement is a preventable, serious complication with major medico-legal implications. The incidence of implant related inferior alveolar nerve (IAN) injuries varies from 0-40%. This article presents four cases of IAN injury following mandibular implant placement with early removal, referred to the oral surgery department, King's College Hospital, London.Objectives To assess sensory disturbance and recovery in

T. Renton; N. Khawaja

2009-01-01

112

3D Assessment of Mandibular Growth Based on Image Registration: A Feasibility Study in a Rabbit Model  

PubMed Central

Background. Our knowledge of mandibular growth mostly derives from cephalometric radiography, which has inherent limitations due to the two-dimensional (2D) nature of measurement. Objective. To assess 3D morphological changes occurring during growth in a rabbit mandible. Methods. Serial cone-beam computerised tomographic (CBCT) images were made of two New Zealand white rabbits, at baseline and eight weeks after surgical implantation of 1?mm diameter metallic spheres as fiducial markers. A third animal acted as an unoperated (no implant) control. CBCT images were segmented and registered in 3D (Implant Superimposition and Procrustes Method), and the remodelling pattern described used color maps. Registration accuracy was quantified by the maximal of the mean minimum distances and by the Hausdorff distance. Results. The mean error for image registration was 0.37?mm and never exceeded 1?mm. The implant-based superimposition showed most remodelling occurred at the mandibular ramus, with bone apposition posteriorly and vertical growth at the condyle. Conclusion. We propose a method to quantitatively describe bone remodelling in three dimensions, based on the use of bone implants as fiducial markers and CBCT as imaging modality. The method is feasible and represents a promising approach for experimental studies by comparing baseline growth patterns and testing the effects of growth-modification treatments. PMID:24527442

Kim, I.; Oliveira, M. E.; Duncan, W. J.; Cioffi, I.; Farella, M.

2014-01-01

113

[Dental implantations of ceramics-coated metals].  

PubMed

Recent studies and personal experience of the Authors in the field of dental implants have encountered the same fundamental problem which arises with orthopedic prosthesis procedures. The basic problem is that of adhesion between the bone tissue and the metal implant. Chrome-cobalt alloy, Tantalum and Titanium are the metals of most recent use. The Authors therefore proceeded to investigate the behaviour of alveolar bone tissue in the proximity of artificial teeth made of alloy (platinum-gold) covered with ceramic, as used in prosthetic dentistry. The experiment was carried out in a dog and a man. In the dog, two of its mandibular teeth were substituted with the same ceramic-gold implants: the first, a replica of natural tooth, was placed in the socket and held in place by metal splint and mandibular circumferential wirings. The other implant, without a replicated crown, was left free, within the alveolus, without contacting the near or opposing teeth. A solid smooth surfaced alumina device, shaped like a small cylinder, was implanted in the upper femoral epiphysis of the same animal. PMID:1105133

Cini, L; Gasparini, F; Michieli, S; Pizzoferrato, A; Sandrolini-Cortesi, S

1975-01-01

114

Axial relationship between dental implants and teeth/implants: a radiographic study.  

PubMed

The relationship of dental implants with neighboring teeth will affect both occlusal relationship and distribution of forces; thus, the purpose of this study was to examine implants' axial relationship with adjacent and opposing teeth/implants. Data of dental implants patients was retrieved. Panoramic X rays were digitized. Computer-based software was used to measure the angular relationship between the implants and adjacent/opposing teeth and implants. Data was further sorted by the mode of placement and implants position. 50 patients (219 implants) were included. Mean angle to adjacent tooth/implant was 178.71° ± 9.18° (range 129.7°-206°). Implants were more parallel to adjacent teeth (180.99° ± 1.06°) than to adjacent implants (176.32° ± 0.54°; P = .0001). Mean angular relationship to opposite tooth was 167.88° ± 8.92° (range 137.7°-179.8°). Implants that were placed freehand or with positional guide had similar intra-arch relationship (178.22° and 178.81°, respectively) and similar inter-arch angulations (164.46° and 167.74°). Molars had greater deviation of the angular relationship (175.54°) compared to premolars (181.62°) and incisors (180.55°, P = .0001). Implants placed in the maxilla had smaller axial deviation compared to implants in the mandible (180.41° ± 0.64 vs 177.14° ± 1.02; P = .0081). Good axial relationship may be obtained in most implants placed by an experienced clinician, even when placed freehand. The mandibular posterior region is more prone to axial deviation and as such requires special attention. PMID:25106006

Machtei, Eli E; Oettinger-Barak, Orit; Horwitz, Jacob

2014-08-01

115

Semirigid Cantilever Extension System for Splinting Implants: A Clinical Report  

PubMed Central

In mandibular edentulous patients, treatment based on immediate loading with rigid splinting in the mandible is well accepted; however, it is cost and time dependent, which sometimes limits this type of rehabilitation. To overcome these problems, the technique of immediate loading using a semirigid splinting extension system has been developed. Its advantages include low cost, technical feasibility, and reduced clinic time. This clinical report presents the applicability and the predictability of semirigid splinting of implants in the mandibular arch of an edentulous patient using a distal extension bar prosthesis system. PMID:25161775

Machado, Raissa Micaella Marcello; Pinto, Luciana de Rezende; Chagas Junior, Otacilio Luiz

2014-01-01

116

3-D Volumetric Evaluation of Human Mandibular Growth  

PubMed Central

Bone growth is a complex process that is controlled by a multitude of mechanisms that are not fully understood.Most of the current methods employed to measure the growth of bones focus on either studying cadaveric bones from different individuals of different ages, or successive two-dimensional (2D) radiographs. Both techniques have their known limitations. The purpose of this study was to explore a technique for quantifying the three dimensional (3D) growth of an adolescent human mandible over the period of one year utilizing cone beam computed tomography (CBCT) scans taken for regular orthodontic records. Three -dimensional virtual models were created from the CBCT data using mainstream medical imaging software. A comparison between computer-generated surface meshes of successive 3-D virtual models illustrates the magnitude of relative mandible growth. The results of this work are in agreement with previously reported data from human cadaveric studies and implantable marker studies. The presented method provides a new relatively simple basis (utilizing commercially available software) to visualize and evaluate individualized 3D (mandibular) growth in vivo. PMID:22046201

Reynolds, Mathew; Reynolds, Michael; Adeeb, Samer; El-Bialy, Tarek

2011-01-01

117

Mandibular Plasmacytoma of Jaw - A Case Report  

PubMed Central

The plasma cell neoplasm may present as Extramedullary Plasmacytoma (EMP) in soft tissues in bone as a Solitary Plasmacytoma of bone (SPB) or as a part of multi focal disseminated disease Multiple Myeloma (MM). The majority of 80% occurs in head and neck region. In our case, a 62-year-old male patient presented with a non tender swelling of short duration. The swelling was noted obliterating the vestibular depth in right lower mandibular region. The radiological features were non specific.

Kaur, Parwinder; Gupta, Rakhi; Gupta, Shally; Singh, Simranjit

2014-01-01

118

Reliability of Mandibular Canines as Indicators for Sexual Dichotomy  

PubMed Central

Introduction: Amongst the various calcified structures in the human body, teeth have gained lot of popularity in estimating the sex of an individual as they are highly resistant to destruction and decomposition. Using permanent mandibular canines many researchers have predicted a high level of accuracy in identifying the sex correctly. The purpose of our study was to gauge the effectiveness of mandibular canines in discerning sex. Materials & Methods: Fifty dental casts each of males and females were utilized for the study. Mesio-distal dimension and inter-canine distance of mandibular right and left canine was recorded using digital vernier caliper and mandibular canine index was calculated. Results: The mean value of mesio-distal dimensions of right and left mandibular canine was slightly greater in males compared to females. The mandibular canine index was equal in both sexes. Inter-canine distance was marginally higher in males compared to females. Despite of higher values in males none of the parameters were statistically significant. Conclusion: The results herein bolster contemporary studies that mesio-distal dimensions of mandibular canines and mandibular canine index do not reflect sexual dimorphism and that its application should be discontinued in sex prediction among Indian populations. How to cite this article: Hosmani J V, Nayak R S, Kotrashetti V S, Pradeep S, Babji D. Reliability of Mandibular Canines as Indicators for Sexual Dichotomy. J Int Oral Health 2013; 5(1):1-7. PMID:24155571

Hosmani, Jagadish V; Nayak, Ramakant S; Kotrashetti, Vijayalakshmi S; S, Pradeep; Babji, Deepa

2013-01-01

119

Reconstruction of Beagle Hemi-Mandibular Defects with Allogenic Mandibular Scaffolds and Autologous Mesenchymal Stem Cells  

PubMed Central

Objective Massive bone allografts are frequently used in orthopedic reconstructive surgery, but carry a high failure rate of approximately 25%. We tested whether treatment of graft with mesenchymal stem cells (MSCs) can increase the integration of massive allografts (hemi-mandible) in a large animal model. Methods Thirty beagle dogs received surgical left-sided hemi-mandibular defects, and then divided into two equal groups. Bony defects of the control group were reconstructed using allografts only. Those of the experimental group were reconstructed using allogenic mandibular scaffold-loaded autologous MSCs. Beagles from each group were killed at4 (n?=?4), 12 (n?=?4), 24 (n?=?4) or 48 weeks (n?=?3) postoperatively. CT and micro-CT scans, histological analyses and the bone mineral density (BMD) of transplants were used to evaluate defect reconstruction outcomes. Results Gross and CT examinations showed that the autologous bone grafts had healed in both groups. At 48 weeks, the allogenic mandibular scaffolds of the experimental group had been completely replaced by new bone, which has a smaller surface area to that of the original allogenic scaffold, whereas the scaffold in control dogs remained the same size as the original allogenic scaffold throughout. At 12 weeks, the BMD of the experimental group was significantly higher than the control group (p<0.05), and all micro-architectural parameters were significantly different between groups (p<0.05). Histological analyses showed almost all transplanted allogeneic bone was replaced by new bone, principally fibrous ossification, in the experimental group, which differed from the control group where little new bone formed. Conclusions Our study demonstrated the feasibility of MSC-loaded allogenic mandibular scaffolds for the reconstruction of hemi-mandibular defects. Further studies are needed to test whether these results can be surpassed by the use of allogenic mandibular scaffolds loaded with a combination of MSCs and osteoinductive growth factors. PMID:25153673

Luo, JinChao; Liu, HuaWei; Hu, Min; Yue, Wen

2014-01-01

120

Effect of healing time on bone-implant contact of orthodontic micro-implants: a histologic study.  

PubMed

Objectives. This study aimed to evaluate the effect of immediate and delayed loading of orthodontic micro-implants on bone-implant contact. Materials and Methods. Sixty four micro-implants were implanted in dog's jaw bone. The micro-implants were divided into loaded and unloaded (control) groups. The control group had two subgroups: four and eight weeks being implanted. The loaded group had two subgroups of immediate loading and delayed (after four weeks healing) loading. Loaded samples were subjected to 200g load for four weeks. After sacrificing the animals micro-implants and surrounding tissues were observed histologically. Bone-implant contact ratios (BIC) were calculated and different groups' results were compared by three-way ANOVA. Results. Mean survival rate was 96.7% in general. Survival rates were 96.7%, 94.4% and 100% for control, immediate and delayed loaded groups, respectively. BIC values were not significantly different in loaded and control groups, immediate and delayed loading groups, and pressure and tension sides. Mandibular micro-implants had significantly higher BIC than maxillary ones in immediate loading, 4-weeks control, and 8-weeks control groups (P = 0.021, P = 0.009, P = 0.003, resp.). Conclusion Immediate or delayed loading of micro-implants in dog did not cause significant difference in Bone-implant contact which could be concluded that healing time had not significant effect on micro-implant stability. PMID:25006463

Ramazanzadeh, Barat Ali; Fatemi, Kazem; Dehghani, Mahboobe; Mohtasham, Nooshin; Jahanbin, Arezoo; Sadeghian, Hamed

2014-01-01

121

Cochlear Implants  

MedlinePLUS

... clinic for an evaluation. The implant team (otolaryngologist, audiologist, nurse, and others) will determine your candidacy for ... for the implant procedure. Hearing (audiologic) evaluation: The audiologist performs extensive hearing tests to find out how ...

122

Breast Implants  

MedlinePLUS

... Safety Data on Silicone Gel-Filled Breast Implants (Press Announcement) [ARCHIVED] Breast Implant Guidance for Industry (2006) Post Approval Studies Webpage Freedom of Information Requests Page Last Updated: 09/17/ ...

123

Cochlear Implants  

MedlinePLUS

A cochlear implant is a small, complex electronic device that can help to provide a sense of sound. People who are ... of-hearing can get help from them. The implant consists of two parts. One part sits on ...

124

Metals for bone implants. Part 1. Powder metallurgy and implant rendering.  

PubMed

New metal alloys and metal fabrication strategies are likely to benefit future skeletal implant strategies. These metals and fabrication strategies were looked at from the point of view of standard-of-care implants for the mandible. These implants are used as part of the treatment for segmental resection due to oropharyngeal cancer, injury or correction of deformity due to pathology or congenital defect. The focus of this two-part review is the issues associated with the failure of existing mandibular implants that are due to mismatched material properties. Potential directions for future research are also studied. To mitigate these issues, the use of low-stiffness metallic alloys has been highlighted. To this end, the development, processing and biocompatibility of superelastic NiTi as well as resorbable magnesium-based alloys are discussed. Additionally, engineered porosity is reviewed as it can be an effective way of matching the stiffness of an implant with the surrounding tissue. These porosities and the overall geometry of the implant can be optimized for strain transduction and with a tailored stiffness profile. Rendering patient-specific, site-specific, morphology-specific and function-specific implants can now be achieved using these and other metals with bone-like material properties by additive manufacturing. The biocompatibility of implants prepared from superelastic and resorbable alloys is also reviewed. PMID:24956564

Andani, Mohsen Taheri; Shayesteh Moghaddam, Narges; Haberland, Christoph; Dean, David; Miller, Michael J; Elahinia, Mohammad

2014-10-01

125

Effect of mandibular setback surgery on the posterior airway size  

Microsoft Academic Search

Treatment of dentofacial deformities with jaw osteotomies has an ef- fect on airway anatomy, and therefore, mandibular setback surgery has the potential to diminish airway size. The purpose of this study was to evaluate the long-term effect of mandibular setback surgery on the airway size. The material consisted of pre- and postoperative (min- imum 1 year) lateral radiograms of 22

Maija Liukkonen; Jaakko Tiekso; Risto-Pekka Happonen

126

Mandibular plasmacytoma of jaw - a case report.  

PubMed

The plasma cell neoplasm may present as Extramedullary Plasmacytoma (EMP) in soft tissues in bone as a Solitary Plasmacytoma of bone (SPB) or as a part of multi focal disseminated disease Multiple Myeloma (MM). The majority of 80% occurs in head and neck region. In our case, a 62-year-old male patient presented with a non tender swelling of short duration. The swelling was noted obliterating the vestibular depth in right lower mandibular region. The radiological features were non specific. PMID:25302275

Kamal, Meet; Kaur, Parwinder; Gupta, Rakhi; Gupta, Shally; Singh, Simranjit

2014-08-01

127

Mandibular kinematics after orthognathic surgical treatment a pilot study.  

PubMed

We recorded three-dimensional mandibular movements, while the mouth was being opened and closed, using an optoelectronic motion analyser in 14 patients (5 skeletal Class II, 9 skeletal Class III) who were being assessed 7-49 months after orthognathic operations, and in 44 healthy subjects. All 14 patients had satisfactory healing on clinical examination, and function had been restored. Mandibular movement was divided into its rotational and translational components. On maximum mouth opening, the patients had significantly less total displacement of the mandibular interincisor point (p=0.05), and more mandibular movement that was explained by pure condylar rotation (p=0.006), than control subjects. There was no significant relation between maximum mouth opening and percentage rotation. While mandibular motion was well restored clinically by orthognathic surgery, the kinematics of the joint were modified. Larger studies and longitudinal investigations are necessary to appreciate the clinical relevance of the variations in condylar rotational and translational components. PMID:18938000

Sforza, Chiarella; Ugolini, Alessandro; Rocchetta, Davide; Galante, Domenico; Mapelli, Andrea; Giannì, Aldo Bruno

2010-03-01

128

Aplasia of the mandibular condyle associated with some orthopaedic abnormalities.  

PubMed

A rare case of aplasia of mandibular condyle associated with some other orthopaedic problems is presented. A 5-year-old boy attended our clinic with a chief complaint of facial asymmetry and chewing difficulty. The mandible was deviated to the left. The occlusion also showed a deflection to the left of the mandibular midline. He also had walking difficulty owing to a hip abnormality. Panoramic radiographic examination of the patient revealed that the left mandibular condyl was totally absent. The right condyle was unremarkable. His history revealed neither trauma nor any significant disease. Aplasia is a rare anomaly and means the insufficient development of the mandibular condyle. True agnesis of the mandibular condyle is extremely rare. Association of the manifestations of the patient with some orthopaedic problems makes this case interesting. PMID:22116127

Canger, E M; Celenk, P

2012-03-01

129

Cone beam computed tomography in oral implants  

PubMed Central

Cone beam computed tomography (CBCT) scanners for the oral and maxillofacial region were pioneered in the late 1990s independently by Arai et al. in Japan and Mozzo et al. CBCT has a lower dose of radiation, minimal metal artifacts, reduced costs, easier accessibility, and easier handling than multislice computed tomography (MSCT); however, the latter is still considered a better choice for the analysis of bone density using a Hounsfield unit (HU) scale. Oral implants require localized area of oral and maxillofacial area for radiation exposure; so, CBCT is an ideal choice. CBCT scans help in the planning of oral implants; they enable measurement of the distance between the alveolar crest and mandibular canal to avoid impingement of inferior alveolar nerve, avoid perforation of the mandibular posterior lingual undercut, and assess the density and quality of bone, and help in planning of the oral implant in the maxilla with special attention to the nasopalatine canal and maxillary sinus. Hence, CBCT reduces the overall exposure to radiation. PMID:24163545

Gupta, Jyoti; Ali, Syed Parveez

2013-01-01

130

Implantable Microimagers  

PubMed Central

Implantable devices such as cardiac pacemakers, drug-delivery systems, and defibrillators have had a tremendous impact on the quality of live for many disabled people. To date, many devices have been developed for implantation into various parts of the human body. In this paper, we focus on devices implanted in the head. In particular, we describe the technologies necessary to create implantable microimagers. Design, fabrication, and implementation issues are discussed vis-à-vis two examples of implantable microimagers; the retinal prosthesis and in vivo neuro-microimager. Testing of these devices in animals verify the use of the microimagers in the implanted state. We believe that further advancement of these devices will lead to the development of a new method for medical and scientific applications.

Ng, David C.; Tokuda, Takashi; Shiosaka, Sadao; Tano, Yasuo; Ohta, Jun

2008-01-01

131

Transmigration of mandibular canine - case report  

PubMed Central

Summary Background Transmigration is a phenomenon of movement of an unerupted tooth in the bone across the midline. This anomaly is not often found. Transmigration is more prevalent in females than in males, and more often encountered in the mandible than maxilla, it affects mostly canines. Case Report The aim of this study was to present a case report of a mandibular canine transmigration in a patient aged 12. Intraoral examination determined hypodontia of right second premolar and delayed eruption of left second premolar in maxilla, as well as persistent deciduous teeth: right second molar, left canine and second molar. The patient was referred for a Cone-Beam CT examination, which allowed precise visualization of the transmigrating canine as well as ruled out resorption of roots of mandibular incisors. Results The treatment with a maxillary fixed orthodontic appliance was finished after obtaining a satisfactory result. Proper alignment of the incisors in the anterior-posterior plane and correct midline position were accepted by the patient. Transmigrating canine after consultation with the surgeon was designed to further radiological observation. PMID:24520309

Gruszka, Katarzyna; Rozylo, T. Katarzyna; Rozylo-Kalinowska, Ingrid; Denkiewicz, Katarzyna; Maslowska, Klaudia

2014-01-01

132

Implant supported prosthesis after ridge augmentation procedure by distraction osteogenesis for atrophic mandible.  

PubMed

Rehabilitation of deficient alveolar ridges has long been a challenge. The distraction osteogenesis procedure before placement of dental implants has solved the puzzle and its advantages over block grafting includes simultaneous expansion of soft tissue, high degree of dimensional stability, abbreviated overall treatment time, and no graft required. In this case report distraction osteogenesis of deficient anterior mandibular ridge was performed and then an implant supported fixed prosthesis was fabricated. PMID:24431801

Khongshei, Arlingstone; Banerjee, Saurav; Gupta, Tapas; Banerjee, Ardhendu

2013-12-01

133

Ion Implantation  

NASA Astrophysics Data System (ADS)

In this tutorial we describe the basic principles of the ion implantation technique and we demonstrate that emission Mössbauer spectroscopy is an extremely powerful technique to investigate the atomic and electronic configuration around implanted atoms. The physics of dilute atoms in materials, the final lattice sites and their chemical state as well as diffusion phenomena can be studied. We focus on the latest developments of implantation Mössbauer spectroscopy, where three accelerator facilities, i.e., Hahn-Meitner Institute Berlin, ISOLDE-CERN and RIKEN, have intensively been used for materials research in in-beam and on-line Mössbauer experiments immediately after implantation of the nuclear probes.

Langouche, G.; Yoshida, Y.

134

Endodontic implants  

PubMed Central

Endodontic implants were introduced back in 1960. Endodontic implants enjoyed few successes and many failures. Various reasons for failures include improper case selection, improper use of materials and sealers and poor preparation for implants. Proper case selection had given remarkable long-term success. Two different cases are being presented here, which have been treated successfully with endodontic implants and mineral trioxide aggregate Fillapex (Andreaus, Brazil), an MTA based sealer. We suggest that carefully selected cases can give a higher success rate and this method should be considered as one of the treatment modalities.

Yadav, Rakesh K.; Tikku, A. P.; Chandra, Anil; Wadhwani, K. K.; Ashutosh kr; Singh, Mayank

2014-01-01

135

Extreme mandibular dentobasal discrepancy in orthognathic surgery: a proposal for a definitive solution.  

PubMed

Some cases in orthognathic surgery present with large discrepancies between the skeletal pattern and the occlusion. If there is little or no sagittal dental discrepancy, but the mandibular basal bone is prognathic, surgical correction can be critical. We describe a two-step procedure to treat these patients. The first step is to adapt the lower alveolar bone to the position of the chin. Distraction osteogenesis in the anterior dentoalveolar mandibular region carries the lower incisors to the same level as the chin. A one-tooth space is opened in the distraction area to obtain a full negative over-jet. Bimaxillary osteotomy can be used to correct class III dentoskeletal malocclusion. Five patients aged 20-40 years have been operated on during the last 2 years. The first step creates harmony between the chin and lower lip, together with a negative over-jet and a true prognathic profile. The class III malocclusion is corrected with a bimaxillary osteotomy. Our two-step plan achieves good occlusion and profile in patients with severe discrepancies between their occlusion and the position of the chin. Dental implants can then be inserted into the gaps left by distraction, which results in a third bicuspid on each side of the mandible. PMID:23746678

Carlino, Franco

2013-12-01

136

OSTEOCHONDRAL INTERFACE REGENERATION OF THE RABBIT MANDIBULAR CONDYLE WITH BIOACTIVE SIGNAL GRADIENTS  

PubMed Central

PURPOSE Tissue engineering solutions focused on the temporomandibular joint (TMJ) have expanded in number and variety over the past decade to address the treatment of TMJ disorders. The existing literature on approaches for healing small defects in the TMJ condylar cartilage and subchondral bone, however, is sparse. The purpose of this study was thus to evaluate the performance of a novel gradient-based scaffolding approach to regenerate osteochondral defects in the rabbit mandibular condyle. MATERIALS AND METHODS Miniature bioactive plugs for regeneration of small mandibular condylar defects in New Zealand White rabbits were fabricated. The plugs were constructed from poly(D,L-lactic-co-glycolic acid) (PLGA) microspheres with a gradient transition between cartilage-promoting and bone-promoting growth factors. RESULTS At six weeks of healing, results suggested that the implants provided support for the neo-synthesized tissue as evidenced by histology and 9.4T magnetic resonance imaging. CONCLUSION The inclusion of bioactive factors in a gradient-based scaffolding design is a promising new treatment strategy for focal defect repair in the TMJ. PMID:21470747

Dormer, Nathan H.; Busaidy, Kamal; Berkland, Cory J.; Detamore, Michael S.

2011-01-01

137

Porosity of human mandibular condylar bone  

PubMed Central

Quantification of porosity and degree of mineralization of bone facilitates a better understanding of the possible effects of adaptive bone remodelling and the possible consequences for its mechanical properties. The present study set out first to give a three-dimensional description of the cortical canalicular network in the human mandibular condyle, in order to obtain more information about the principal directions of stresses and strains during loading. Our second aim was to determine whether the amount of remodelling was larger in the trabecular bone than in cortical bone of the condyle and to establish whether the variation in the amount of remodelling was related to the surface area of the cortical canals and trabeculae. We hypothesized that there were differences in porosity and orientation of cortical canals between various cortical regions. In addition, as greater cortical and trabecular porosities are likely to coincide with a greater surface area of cortical canals and trabeculae available for osteoblastic and osteoclastic activity, we hypothesized that this surface area would be inversely proportional to the degree of mineralization of cortical and trabecular bone, respectively. Micro-computed tomography was used to quantify porosity and mineralization in cortical and trabecular bone of ten human mandibular condyles. The cortical canals in the subchondral cortex of the condyle were orientated in the mediolateral direction, and in the anterior and posterior cortex in the superoinferior direction. Cortical porosity (average 3.5%) did not differ significantly between the cortical regions. It correlated significantly with the diameter and number of cortical canals, but not with cortical degree of mineralization. In trabecular bone (average porosity 79.3%) there was a significant negative correlation between surface area of the trabeculae and degree of mineralization; such a correlation was not found between the surface area of the cortical canals and the degree of mineralization of cortical bone. No relationship between trabecular and cortical porosity, nor between trabecular degree of mineralization and cortical degree of mineralization was found, suggesting that adaptive remodelling is independent and different between trabecular and cortical bone. We conclude (1) that the principal directions of stresses and strains are presumably directed mediolaterally in the subchondral cortex and superoinferiorly in the anterior and posterior cortex, (2) that the amount of remodelling is larger in the trabecular than in the cortical bone of the mandibular condyle; in trabecular bone variation in the amount of remodelling is related to the available surface area of the trabeculae. PMID:17331174

Renders, G A P; Mulder, L; van Ruijven, L J; van Eijden, T M G J

2007-01-01

138

A Three-rooted Mandibular Second Premolar: A Case Report  

PubMed Central

Presence of extra roots and canals should be considered before initiation of root canal treatment for the success of endodontic treatment. A mandibular second premolar with three separate roots is very rare and its prevalence has been reported to be around 0.1%. This case report explains non-surgical endodontic treatment of a mandibular second premolar with three separate roots and three separate mesiobuccal, midbuccal, and lingual canal orifices. Close attention to anatomic variations, thorough radiographic examinations, thorough evaluation of the pulp chamber floor, and use of magnifying and optical devices have been recommended for the success of endodontic treatment of mandibular second premolars with complicated root canal system anatomy.

Fathi, Zahra; Rahimi, Saeed; Tavakoli, Reza; Amini, Mahsa

2014-01-01

139

Rehabilitation of the atrophic posterior mandible with short (4-mm) implants: a case report.  

PubMed

This case report describes a successful implant-prosthetic rehabilitation of an atrophic posterior mandible with 4-mm-long implants. The patient refused to undergo any reconstructive surgery, and because the available bone up to the inferior alveolar nerve was only 5 mm or less, the patient received four implants of 4-mm length. Four months after implant placement, a provisional prosthesis was put in place; after another 4 months, this was then in turn replaced with a definitive prosthesis. The use of such short implants allows a fixed prosthetic solution without the need for vertically augmenting the mandibular bone. This procedure considerably reduces intra- and postoperative patient discomfort compared with reconstructive surgery for the placement of longer implants. The follow-up time was 1 year after implant loading. PMID:25171043

Pistilli, Roberto; Barausse, Carlo; Checchi, Luigi; Felice, Pierto

2014-01-01

140

Management of a patient suffering with Cherubism with dental implants.  

PubMed

Cherubism is a rare non-neoplastic, fibro-osseous hereditary disorder characterized by bilateral expansion of the maxilla and mandible producing a characteristic facial appearance. It can affect the facial and dental growth of the individual and often results in gross aesthetic and functional deficiencies. The teeth may also be displaced or submerged and these problems can often compromise successful restorative rehabilitation. This paper describes the restorative management of an adult patient with Cherubism involving a fixed implant retained mandibular restoration. The care utilized 3D planning software and implant insertion guides to facilitate an early loading protocol and the use of optimum bone quality/volume areas. PMID:21780729

Dewan, Karun; Bishop, Karl

2011-06-01

141

Extra Corporeal Fixation of Fractured Mandibular Condyle  

PubMed Central

Condylar fracture is the second most common site in the mandibular fractures. Motor vehicle accident and fall are the major causes of such fractures. Because of the anatomical weakness of the condyle and the shape of the condylar head the antero-medial dislocation of the condyle is common. Open reduction and closed reduction is always debatable. The open reduction will bring back the normal function much earlier than closed reduction. Medially dislocated condylar fracture fragments are always managed with open method. In superior or high condylar fractures,exact reduction with conventional open reduction can be difficult due to the limited surgical and visual fields. In such cases extracorporeal fixation of condyle using vertical ramus osteotomy may be better choice to achieve perfect alignment and absolute maintaince of vertical height of the ramus and facial symmetry. We here present a case of extracorporeal fixation of unilateral left high condylar fracture. PMID:25386546

Shenoy K, Vandana; Kengagsubbiah, Srivatsa; V, Sathyabhama; Priya, Vishnu

2014-01-01

142

Assessment of mandibular growth by skeletal scintigraphy  

SciTech Connect

Accurate assessment of facial skeletal growth remains a major problem in craniomaxillofacial surgery. Current methods include: (1) comparisons of chronologic age with growth histories of the patient and the family, (2) hand-wrist radiographs compared with a standard, and (3) serial cephalometric radiographs. Uptake of technetium-99m methylene diphosphonate into bone is a reflection of current metabolic activity and blood flow. Therefore, scintigraphy with this radiopharmaceutical might serve as a good method of assessing skeletal growth. Thirty-four patients, ranging in age from 15 months to 22 years, who were undergoing skeletal scintigrams for acute pathologic conditions of the extremities, were used to develop standards of uptake based on age and skeletal maturation. The results indicate that skeletal scintigraphy may be useful in evaluation of mandibular growth.

Kaban, L.B.; Cisneros, G.J.; Heyman, S.; Treves, S.

1982-01-01

143

GMP-level adipose stem cells combined with computer-aided manufacturing to reconstruct mandibular ameloblastoma resection defects: Experience with three cases  

PubMed Central

Background: The current management of large mandibular resection defects involves harvesting of autogenous bone grafts and repeated bending of generic reconstruction plates. However, the major disadvantage of harvesting large autogenous bone grafts is donor site morbidity and the major drawback of repeated reconstruction plate bending is plate fracture and difficulty in reproducing complex facial contours. The aim of this study was to describe reconstruction of three mandibular ameloblastoma resection defects using tissue engineered constructs of beta-tricalcium phosphate (?-TCP) granules, recombinant human bone morphogenetic protein-2 (rhBMP-2), and Good Manufacturing Practice (GMP) level autologous adipose stem cells (ASCs) with progressively increasing usage of computer-aided manufacturing (CAM) technology. Materials and Methods: Patients’ three-dimensional (3D) images were used in three consecutive patients to plan and reverse-engineer patient-specific saw guides and reconstruction plates using computer-aided additive manufacturing. Adipose tissue was harvested from the anterior abdominal walls of three patients before resection. ASCs were expanded ex vivo over 3 weeks and seeded onto a ?-TCP scaffold with rhBMP-2. Constructs were implanted into patient resection defects together with rapid prototyped reconstruction plates. Results: All three cases used one step in situ bone formation without the need for an ectopic bone formation step or vascularized flaps. In two of the three patients, dental implants were placed 10 and 14 months following reconstruction, allowing harvesting of bone cores from the regenerated mandibular defects. Histological examination and in vitro analysis of cell viability and cell surface markers were performed and prosthodontic rehabilitation was completed. Discussion: Constructs with ASCs, ?-TCP scaffolds, and rhBMP-2 can be used to reconstruct a variety of large mandibular defects, together with rapid prototyped reconstruction hardware which supports placement of dental implants. PMID:24205470

Wolff, Jan; Sandor, George K.; Miettinen, Aimo; Tuovinen, Veikko J.; Mannerstrom, Bettina; Patrikoski, Mimmi; Miettinen, Susanna

2013-01-01

144

Comprehensive restoration and mandibular incisor esthetic exposure: a clinical report.  

PubMed

Complete mouth rehabilitation allows the dentist to solve multiple problems by controlling the restoration of many teeth. Guidelines and objective criteria for each area to be treated are essential when planning an extensive case. Esthetics, phonetics, and anterior guidance are affected by the height and inclination of the mandibular incisors. Placement of the mandibular incisal plane is important, as the mandibular anterior teeth may be more visible than the maxillary anterior teeth during speaking or when at rest. Provisional restorations can be adjusted and recorded so that the final restorations are predictably successful. This case illustrates the use of a trial incisal edge and digital videography of the provisional restoration to facilitate correct placement of the mandibular incisal plane. PMID:24192736

Solow, Roger A

2013-01-01

145

Mandibular first molar with a radix entomolaris: an endodontic dilemma.  

PubMed

It is known that the mandibular first molar can display significant anatomical variations namely the number of root canals, the number of roots and morphology. Mandibular molars may sometimes have an additional root located lingually (the radix entomolaris) or buccally (the radix paramolaris). If encountered, an awareness and understanding of this unusual root and its canal morphology can contribute to the successful outcome of root canal treatment. This case report discusses endodontic treatment of a mandibular first molar with a radix entomolaris, which is a rare entity and poses as an endodontic dilemma for the clinician with respect to diagnosis and subsequent treatment. Clinicians should be aware of these unusual root morphologies in the mandibular first molar which needs strategic treatment as unfilled canals remain a nidus for infection and can compromise treatment outcome. PMID:24910685

Sarangi, Priyanka; Uppin, Veerendra M

2014-01-01

146

The extraction socket and the dental implant restoration.  

PubMed

The purpose of this article is to provide clinical recommendations for creating an esthetic restoration when utilizing an endosseous implant in the more demanding maxillary or mandibular anterior region of the mouth. The process attempts to correct alterations in form and function due to the undesirable effects of caries, periodontal infection or injury to the teeth and/ or their supporting tissues. Oftentimes, this requires an interdisciplinary approach that may be very delicate, involving the management of bone, soft tissue, and the design of the implant abutment and implant crown forms with carefully constructed physiologic contours. This article focuses on single implant-supported restorations that will have on influence on cosmesis of the esthetic region of the mouth. PMID:25269219

Starr, Neil L

2014-01-01

147

Mandibular premolars with aberrant canal morphology: An endodontic challenge  

PubMed Central

Complete cleaning and shaping is the key to successful endodontic treatment. A thorough understanding of the internal anatomy and morphology of the root canal system is an important consideration when performing cleaning and shaping procedures. Mandibular premolars are one of the most difficult teeth to treat endodontically because of aberrant root canal anatomy. This article describes case series of mandibular premolars with variations in root canal anatomy treated successfully by conventional endodontic treatment.

Mittal, Sunandan; Kumar, Tarun; Mittal, Shifali; Sharma, Jyotika

2014-01-01

148

Tongue and Lateral Upper Airway Movement with Mandibular Advancement  

PubMed Central

Study Objectives: To characterize tongue and lateral upper airway movement and to image tongue deformation during mandibular advancement. Design: Dynamic imaging study of a wide range of apnea hypopnea index (AHI), body mass index (BMI) subjects. Setting: Not-for-profit research institute. Participants: 30 subjects (aged 31-69 y, AHI 0-75 events/h, BMI 17-39 kg/m2). Interventions: Subjects were imaged using dynamic tagged magnetic resonance imaging during mandibular advancement. Tissue displacements were quantified with the harmonic phase technique. Measurements and Results: Mean mandibular advancement was 5.6 ± 1.8 mm (mean ± standard deviation). This produced movement through a connection from the ramus of the mandible to the pharyngeal lateral walls in all subjects. In the sagittal plane, 3 patterns of posterior tongue deformation were seen with mandibular advancement—(A) en bloc anterior movement, (B) anterior movement of the oropharyngeal region, and (C) minimal anterior movement. Subjects with lower AHI were more likely to have en bloc movement (P = 0.04) than minimal movement. Antero-posterior elongation of the tongue increased with AHI (R = 0.461, P = 0.01). Mean anterior displacements of the posterior nasopharyngeal and oropharyngeal regions of the tongue were 20% ± 13% and 31% ± 17% of mandibular advancement. The posterior tongue compressed 1.1 ± 2.2 mm supero-inferiorly. Conclusions: Mandibular advancement has two mechanisms of action which increase airway size. In subjects with low AHI, the entire tongue moves forward. Mandibular advancement also produces lateral airway expansion via a direct connection between the lateral walls and the ramus of the mandible. Citation: Brown EC; Cheng S; McKenzie DK; Butler JE; Gandevia SC; Bilston LE. Tongue and lateral upper airway movement with mandibular advancement. SLEEP 2013;36(3):397-404. PMID:23450677

Brown, Elizabeth C.; Cheng, Shaokoon; McKenzie, David K.; Butler, Jane E.; Gandevia, Simon C.; Bilston, Lynne E.

2013-01-01

149

Isolation and Characterization of Murine Mandibular Condylar Cartilage Cell Populations  

PubMed Central

Objectives The mandibular condylar cartilage is a heterogeneous tissue containing cells at various stages of chondrocyte maturation organized into 4 zones: superficial, polymorphic, flattened, and hypertrophic. The goal of this study was to use transgenic mice containing chondrocyte maturation markers fused to fluorescent protein transgenes to isolate and characterize homogenous cell populations of the mandibular condylar cartilage. Methods Fluorescent reporter expression in the mandibular condylar cartilage of transgenic mice containing the 3.6-kb fragment of the rat collagen type 1 promoter fused to a topaz-fluorescent protein (Col3.6-tpz), collagen type 2 promoter fused to a cyan-fluorescent protein (Col2-cyan), and/or collagen type 10 promoter fused to cherry-fluorescent protein (Col10-cherry) was examined. Mandibular condylar cartilage cells were analyzed by fluorescence-activated cell sorting (FACS) and either used for gene expression analysis or plated in cell cultures and exposed to adipogenic, osteogenic, or chondrogenic conditions. To determine cell fate, transgenic mice containing the Col3.6-cre recombinase were bred with cre reporter mice. Results Localization and analysis of gene expression revealed that Col3.6-tpz-positive cells corresponded to the polymorphic/flattened zones and Col2-cyan-positive cells corresponded to the flattened/hypertrophic zones of the mandibular condylar cartilage. Mandibular condylar cartilage FACS-sorted Col3.6-tpz-positive cells have the potential to differentiate into bone, cartilage, and fat. Cell fate mapping revealed that Col3.6 cells are precursors of some of the hypertrophic chondrocytes in the mandibular condylar cartilage. Conclusion Col3.6-tpz cells represent an earlier stage of the mandibular condylar cartilage maturation pathway. PMID:21646777

Chen, J.; Utreja, A.; Kalajzic, Z.; Sobue, T.; Rowe, D.; Wadhwa, S.

2012-01-01

150

Radiographic Localization of the Mental Foramen and Mandibular Canal  

PubMed Central

Objective: Accurately localizing the mental foramen and mandibular canal is important when administering local anesthesia and performing surgery; therefore, knowing the normal range of the possible locations is essential. Our purpose was to assess the location of the mental foramen and mandibular canal in an Iranian population using panoramic radiography. Materials and Methods: Standard panoramic radiographies were performed. The positions of 100 mental foramens were evaluated. The distances from the center of the mental foramen to the superior and inferior borders of the mandible and to the apexes of the first and second premolar were measured. The distance of the mental foramens from the mandibular midline and the diameter of the mandibular canal in the mental foramen connection were also measured. Results: Among 100 mental foramens, 6% were positioned under the first premolar, 24% were between the first and second premolars, 67% were under the second premolar, and the remaining 3% were behind the second premolar. The mean distance from the mental foramen to the mandibular midline was 27.77±3.20 mm. The mean diameter of the mandibular canal in the mental foramen connection was 3.09±0.69mm. Conclusion: The mental foramen was near the second premolar and the inferior border of the mandible. This information can be used to perform safer mental nerve blocks in surgical interventions. PMID:24910651

Afkhami, Farzaneh; Haraji, Afshin; Boostani, Hamid Reza

2013-01-01

151

The role of mandibular condylar cartilage in articular cartilage repair.  

PubMed Central

The articular hyaline cartilage of synovial joints has a very limited capacity for repair after injury. In contrast, the mandibular condylar cartilage of the temporomandibular joint possesses as intrinsic potential for regeneration. This study aimed to test the hypothesis that cultured allografts of mandibular condylar cartilage could be used to promote biological repair of injured orthotopic joint surfaces. Using a primate animal model, cultures of mandibular condylar cartilage cells were grafted into surgically created defects in a recipient hyaline cartilage joint surface. Articular wound healing was assessed macroscopically and histologically over a postoperative period of 52 weeks. Mandibular condylar cartilage cells scheduled for allogenous transplantation were initially characterised in vitro. Expansion of primary colonies in organ culture provided the allogenic cellular material for in vivo grafting. Grafting of osteochondral articular wounds with 5-week cultures of mandibular cartilage cells led to wound regeneration with complete reconstitution of articular surface continuity by 52 weeks. There was novel synthesis of cartilage collagens and sulphated glycosaminoglycans within the repair tissue and no evidence of immunological rejection. Healing of grafted defects was thought to occur by a combination of donor cell proliferation and ingress of host mesenchymal cells. In contrast, grafted control wounds underwent largely fibrous repair with incomplete articular regeneration. In conclusion, transplanted allografts of cultured mandibular condylar cartilage appeared to have the ability, in this primate model, to promote cartilaginous repair and regeneration of orthotopic articular wounds. Images Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 PMID:9038492

Girdler, N. M.

1997-01-01

152

Intra-articular vs. systemic administration of etanercept in antigen-induced arthritis in the temporomandibular joint. Part II: mandibular growth  

PubMed Central

Background Temporomandibular joint (TMJ) arthritis in children causes alterations in the craniomandibular growth. Resultant abnormalities include; condylar erosions, a posterior mandibular rotation pattern, micrognathia, malocclusion with an anterior open bite, altered joint and muscular function occasionally associated with pain. These alterations may be prevented by early aggressive anti-inflammatory intervention. Previously, we have shown that intra-articular (IA) corticosteroid reduces TMJ inflammation but causes additional mandibular growth inhibition in young rabbits. Local blockage of TNF-? may be an alternative treatment approach against TMJ involvement in juvenile idiopathic arthritis (JIA). We evaluated the anti-inflammatory effect of IA etanercept compared to subcutaneous etanercept in antigen-induced TMJ-arthritis in young rabbits in terms of mandibular growth. This article (Part II) presents the data and discussion on the effects on facial growth. In Part I the anti-inflammatory effects of systemic and IA etanercept administration are discussed. Methods Arthritis was induced and maintained in the TMJs of 10-week old pre-sensitized rabbits (n = 42) by four repeated IA TMJ injections with ovalbumin, over a 12-week period. One group was treated weekly with systemic etanercept (0.8 mg/kg) (n = 14), another group (n = 14) received IA etanercept (0.1 mg/kg) bilaterally one week after induction of arthritis and one group (n = 14) served as an untreated arthritis group receiving IA TMJ saline injections. Head computerized tomographic scans were done before arthritis was induced and at the end of the study. Three small tantalum implants were inserted into the mandible, serving as stable landmarks for the super-impositions. Nineteen variables were evaluated in a mandibular growth analysis for inter-group differences. All data was evaluated blindedly. ANOVA and T-tests were applied for statistical evaluation using p < 0.05 as significance level. Results Significant larger mandibular growth disturbances were observed in the group receiving IA saline injections compared with the systemic etanercept group. The most pronounced unfavourable posterior mandibular rotation pattern was observed in the group receiving IA saline injections. Conclusion Intervention with systemic etanercept monotherapy equivalent to the recommended human dose allows a mandibular growth towards an original morphology in experimental TMJ arthritis. Systemic administrations of etanercept are superior to IA TMJ administration of etanercept in maintaining mandibular vertical growth. PMID:19200378

Stoustrup, Peter; Kristensen, Kasper D; Küseler, Annelise; Pedersen, Thomas K; Gelineck, John; Herlin, Troels

2009-01-01

153

Geriatric slim implants for complete denture wearers: clinical aspects and perspectives  

PubMed Central

Background Advances made in prevention have helped postpone complete edentulism in older patients. However, in the elderly, the physiological state reduces patients’ ability to adapt to oral rehabilitation and degrades the patient’s oral condition. Consequently, elderly edentulous subjects avoid many types of foods, which can lead to substantial nutritional consequences. Complete dentures retained by implants are, currently, the treatment of reference in prosthodontic mandibular rehabilitation. Indeed, the mandibular symphysis generally tolerates implantation, even when the mandible is strongly resorbed. However, in the elderly, implant rehabilitation is compromised by the complexity of the surgical protocol and possible postoperative complications. In this context, the use of geriatric “slim implants” (GSI) offers an interesting alternative. Methods In the present study, the surgical and prosthetic procedures for the use of GSI in a French dental hospital are presented. The objective was the stabilization of a complete mandibular denture in an elderly person, with the immediate implantation of four GSI. Results The operating procedure was found to be less invasive, less expensive, simpler, and more efficient than the conventional procedure. Conclusion The result strongly suggests that this protocol could be used systematically to treat complete edentulism in very elderly patients. Long-term monitoring and the evaluation of the reliability of this type of rehabilitation should be undertaken. PMID:24009432

Huard, Cedric; Bessadet, Marion; Nicolas, Emmanuel; Veyrune, Jean-Luc

2013-01-01

154

Treatment of a patient with cleidocranial dysplasia using a single-stage implant protocol.  

PubMed

This patient report describes the treatment of a 45-year-old Caucasian woman with cleidocranial dysplasia who had significant dental problems that greatly affected her quality of life. The patient had orthodontic treatment in her earlier years along with surgical removal of supernumerary teeth. Using implants, the maxillary and mandibular arches were restored with fixed screw-retained prostheses. Eight implants and six implants were placed in the maxilla and mandible, respectively. Both arches were immediately loaded following the Teeth in a Day™ protocol using an all-acrylic resin provisional prosthesis. Five months later, definitive maxillary and mandibular prostheses were fabricated. The patient has been followed for a period of 5 years, and all postoperative evaluations have been uneventful. PMID:22003879

Petropoulos, Vicki C; Balshi, Thomas J; Wolfinger, Glenn J; Balshi, Stephen F

2011-10-01

155

Predictable aesthetic outcome with immediate placement and early loading of one piece mini implant - A 5 year follow-up case report.  

PubMed

One piece mini implants are viable and predictable options to conventional implants in areas of deficit bone width. These can be placed without complex surgical augmentation procedures and are cost effective. Four mini implants were placed in a 40 year old female patient replacing her mobile mandibular anterior teeth. Provisional restoration was given after 2 weeks followed by individual ceramic crowns after 6 months. 5 year follow-up showed aesthetic soft tissue contours and successful osseointegration. One piece mini implants are viable treatment option in the aesthetic management of partial edentulism especially in the mandibular anterior region. How to cite the article: Mohan CS, Harinath P, Cholan PK, Kumar DL . Predictable aesthetic outcome with immediate placement and early loading of one piece mini implant - A 5 year follow-up case report. J Int Oral Health 2014;6(2):132-5. PMID:24876715

Mohan, C S Anand; Harinath, P; Cholan, Priyanka K; Kumar, D Lokesh

2014-04-01

156

Mandibular facial talon cusp: Case report  

PubMed Central

Background Talon cusp is a supernumerary structure projecting from the dento-enamel junction to a variable distance towards the incisal edge of an anterior tooth. Studies have shown that it consists of enamel, dentine and a variable amount of pulp tissue. Hyperactivity of the enamel organ during morphodifferentiation has been attributed to its formation. Most previous reports have been made concerning the occurrence of this structure on primary and permanent teeth and mostly on the palatal aspect. Only few have been reported on the facial aspect of the teeth. When it occurs, the effects are mainly aesthetic and functional and so early detection and treatment is essential in its management to avoid complications. Case presentation An unusual case of talon cusp on the facial aspect of a mandibular central incisor is reported. Its presence resulted in attrition of the opposing tooth. Reduction of the cusp and topical application of fluoride gel was initiated. Conclusion The management and treatment outcome of talon cusp depends on the size, presenting complications and patient cooperation. PMID:16336661

Oredugba, Folakemi A

2005-01-01

157

Mandibular osteosarcoma in a nutria (Myocastor coypus).  

PubMed

A four-year-old neutered male nutria (Myocastor coypus) was presented for a one-day history of lethargy and anorexia. A right-sided facial swelling and loose right mandibular fourth molar that exuded caseous exudate from the root were noted; however, the animal continued to decline despite removal of the affected tooth and antibiotic and anti-inflammatory therapy. Radiographs showed a lytic proliferative bony lesion on the right mandible that appeared to expand in size over the course of a week. Due to its declining clinical condition and poor response to therapy, the animal was euthanized. Necropsy revealed an invasive bony neoplasm of the right mandible, histologically consistent with an osteosarcoma, that was invading the mandible and dental arcade, likely contributing to tooth root infection and osteomyelitis. Endocardiosis of the tricuspid valve was incidentally found as well with early cardiac remodeling of the right ventricle. This is the first report of an osteosarcoma and endocardiosis in a nutria. PMID:25314853

Johnson, James G; Kim, Kenneth; Serio, Jacqueline; Paulsen, Daniel; Rademacher, Nathalie; Pirie, Gordon

2014-09-01

158

Correlation between symphyseal morphology and mandibular growth  

PubMed Central

Background: This study sought to assess symphyseal morphology in adolescents with different mandibular growth patterns (MGPs) in order to see if a relation exists. Materials and Methods: In this study the symphyseal parameters (height, depth, and ratio) of normal subjects were compared with four groups with malocclusion (cl III vertical, cl II vertical, cl III horizontal, and cl II horizontal). These groups (15 samples each) were matched (for sex and cervical maturation stage [CVMS]) based on their cephalograms and patient charts. Growth patterns were differentiated by seven vertical parameters and the Wylie analysis. After confirmation of normality of the groups and similarity of their variances the two-way analysis of variance (ANOVA) was used for analysis of data assessed by adjusted chi-square (P < 0.001). The comparison of cases with the normal group was performed by the Dunnett method. Intraclass Correlation Coefficient (ICC) was used for evaluation of intraobserver reliability. Results: We found the symphyseal ratio to have a significant correlation with the MGP (P < 0.001). The symphyseal ratio (Height/Depth) was small in a mandible with vertical growth pattern Cl II or Cl III. Conversely, a horizontal growth pattern of a Cl II or Cl III mandible was associated with a larger ratio of the symphysis in comparison with the normal group. The symphyseal ratio was also found to be greater in females. Conclusion: The symphyseal ratio was found to be strongly associated with the MGP. PMID:25097649

Moshfeghi, Mahkameh; Nouri, Mahtab; Mirbeigi, Sanam; Baghban, Alireza Akbar Zadeh

2014-01-01

159

Herbal remedies for mandibular fracture healing  

PubMed Central

Purpose: When a bone is fractured it is usually necessary to employ a mechanical means to reduce and maintain the fragments in position. However, healing of the fracture is governed by biological principles, with which the mechanical measures must be coordinated to the end, such that a satisfactory bony union and restoration of form and function are obtained. We have studied the effect of Cissus quadrangularis (Harjor) and Ocimum sanctum (Tulsi), in the healing of mandibular fractures. Materials and Methods: A total of 29 cases having a fracture in the body of the mandible were included in the study and divided into three groups. Groups A and B were treated with Ocimum sanctum and Cissus quadrangularis, respectively, and fracture healing was assessed with biochemical markers and the bite force. Group C was the control group. Results: The period of immobilization was the lowest in the Group A followed by Group B. A significant increase in alkaline phosphatase and serum calcium was seen in Group B. The tensile strength in terms of the biting force was the maximum in cases of Group B. Conclusion: We conclude that Cissus quadrangularis and Ocimum sanctum help in fracture healing, and use of such traditional drugs will be a breakthrough in the management and early mobilization of facial fractures.

Mohammad, Shadab; Pal, U.S.; Pradhan, R.; Singh, Nimisha

2014-01-01

160

Long-term evaluation of non-submerged ITI implants. Part 1: 8-year life table analysis of a prospective multi-center study with 2359 implants.  

PubMed

In the present multi-center study, non-submerged ITI implants were prospectively followed to evaluate their long-term prognosis in fully and partially edentulous patients. In a total of 1003 patients, 2359 implants were consecutively inserted. Following a healing period of 3-6 months, the successfully integrated implants were restored with 393 removable and 758 fixed restorations. Subsequently, all consecutive implants were documented annually up to 8 years. At each examination, the clinical status of all implants was evaluated according to predefined criteria of success. Therefore, the data base allowed the evaluation of 8-year cumulative survival and success rates for 2359 implants. In addition, cumulative success rates were calculated for implant subgroups divided per implant type, implant length, and implant location. Furthermore, the actual 5-year survival and success rates could be determined for 488 implants. During the healing period, 13 implants did not successfully integrate, whereas 2346 implants fulfilled the predefined criteria of success. This corresponds with an early failure rate of 0.55%. During follow-up, 19 implants were classified as failures due to several reasons. In addition, 17 implants (approximately 0.8%) demonstrated at the last annual examination a suppurative periimplant infection. Including 127 drop out implants (= 5.4% drop out rate) into the calculation, the 8-year cumulative survival and success rates resulted in 96.7% and 93.3%, respectively. The analysis of implant subgroups showed slightly more favorable cumulative success rates for screw type implants (> 95%) compared to hollow-cylinder implants (91.3%), and clearly better success rates for mandibular implants (approximately 95%) when compared to maxillary implants (approximately 87%). The actual 5-year survival and success rates of 488 implants with 98.2% and 97.3%, respectively, were slightly better than the estimated 5-year cumulative survival and success rates of 2359 implants indicating that the applied life table analysis is a reliable statistical method to evaluate the long-term prognosis of dental implants. It can be concluded that non-submerged ITI implants maintain success rates well above 90% in different clinical centers for observation periods up to 8 years. PMID:9586460

Buser, D; Mericske-Stern, R; Bernard, J P; Behneke, A; Behneke, N; Hirt, H P; Belser, U C; Lang, N P

1997-06-01

161

Mandibular asymmetry treated with a modified activator appliance.  

PubMed

Aplasia of the mandibular condyle alone without any other facial malformation and medical history is a very rare condition. This clinical report describes treatment with a functional appliance in a young patient with aplasia of the mandibular condyle alone without any other facial malformation, which is a very rare condition. The patient, a 6(1/2)-year-old girl, was referred for treatment of mandibular asymmetry. There was no relevant family history. The patient showed early mixed dentition with a II molar relationship on the right and II on the left side, 5 mm of overbite and 5 mm of overjet, and a lower midline discrepancy of 3 mm. According to the Pruzansky-Kaban classification of mandibular deformity, the patient was a type IIA; according to Vento and his classification, the mandible of the patient was M2B. The patient was given a Haupl-Andresen activator, which had been modified to reposition the right mandible downward and forward. The functional appliance therapy lasted for approximately 4 years. The affected side showed remarkable condylar growth compared with the normal side. Seven years later, the correction of the mandibular asymmetry was stable and no relapse had occurred. PMID:17667690

Leonardi, Rosalia; Barbato, Ersilia

2007-07-01

162

Ion Implant  

NSDL National Science Digital Library

This website includes an animation which illustrates the ion implant process. Objective: Name the three common dopants used in implantation processes and explain the process of generating an ion beam from source to wafer. You can find this animation under the heading "Process & Equipment III." This simulation is from Module 026 of the Process & Equipment III Cluster of the MATEC Module Library (MML). To view other clusters or for more information about the MML visit http://matec.org/ps/library3/process_I.shtmlKey

2012-10-04

163

Mandibular Fracture and Necrotizing Sialometaplasia in a Rabbit  

PubMed Central

A 7-mo-old female New Zealand white rabbit presented with hemorrhage of the gingiva surrounding a loose lower right incisor. Antemortem conventional radiographs revealed only a small bone fragment adjacent to the left mandible's body. In light of a provisional diagnosis of mandibular fracture, the rabbit was euthanized. Postmortem radiographs of the disarticulated mandible demonstrated mandibular symphyseal fracture and comminuted fracture of the ramus and body of the left mandible. According to histopathology, the left submandibular salivary gland had necrotizing sialometaplasia, a nonneoplastic condition of the salivary glands that is caused by ischemic infarction. Although rabbits have been used as animal models of mandibular fracture and necrotizing sialometaplasia, no nonexperimental case of such conditions had been reported previously. PMID:23561940

Villano, Jason S; Cooper, Timothy K

2013-01-01

164

Mandibular talon cusp: A rare presentation with the literature review  

PubMed Central

A talon cusp is a supernumerary structure projecting from the dento-enamel junction to a variable distance towards the incisal edge of an anterior tooth. It consists of enamel, dentine and a variable amount of pulp tissue. Hyperactivity of the enamel organ during morpho-differentiation has been attributed to its formation. It has esthetic and functional concerns. Reports of a mandibular talon cusp are rare in the literature. To the best of our knowledge, only 14 cases have been reported, of which only 2 cases in mandibular left central incisors. We report the second instance of a talon cusp in the lingual aspect of the mandibular left central incisor and the first such report in a patient of Libyan origin. A talon cusp is an odontogenic anomaly, which can cause occlusal interferences, displacement of the affected tooth and speech difficulties. Early diagnosis of a talon cusp helps in selecting the appropriate treatment procedure and to avoid future complications. PMID:22346243

Ramalingam, Karthikeyan; Gajula, Prathima

2011-01-01

165

Three Cases of Elongated Mandibular Coronoid Process with Different Presentations  

PubMed Central

Abnormal elongation of the mandibular coronoid process is rare and its etiology is not yet elucidated. The aim of this report is to demonstrate and discuss the relationship between elongated mandibular coronoid process and limitation of mouth opening with cone beam computed tomography. Although the clinical characteristic of elongation of the coronoid process is mandibular limitation, in this report, one case had problem with mouth opening. Axial scans revealed that the distance between the coronoid process and the inner face of the frontal part of the zygomatic bone may cause limitation in mouth opening. In conclusion, instead of the length, the distance between the coronoid process and the inner face of the frontal part of the zygomatic bone may be the actual reason for limitation of mouth opening. This may prevent misdiagnosis. PMID:24693298

Ilguy, Mehmet; Kursoglu, Pinar; Ilguy, Dilhan

2014-01-01

166

Isolated bilateral macrodontia of mandibular second premolars: A case report  

PubMed Central

Isolated bilateral macrodontia of mandibular second premolars is an extremely rare dental anomaly with only 5 cases reported to date. This case report presents clinical and radiographic findings of isolated bilateral macrodontia in a 12-year-old child. The patient was referred to the clinic with local crowding of mandibular posterior teeth. Radiographic findings revealed the presence of impacted macrodont mandibular second premolars and their distinct morphological appearance, characterized by large, multitubercular, molariform crowns, and tapering, single roots. Following surgical removal of the impacted premolars, orthodontic therapy was initiated to correct the malocclusion. Along with the features and treatment of this rare anomaly, this case report also illustrates the benefits, in terms of treatment planning and surgical technique, of supplementing conventional radiography with cone-beam computed tomography to localize the macrodont premolars and accurately establish their relationship with the neighboring roots and anatomic structures. PMID:22904663

Canoglu, Ebru; Canoglu, Harun; Aktas, Alper; Cehreli, Zafer C.

2012-01-01

167

Orthodontic Treatment of a Mandibular Incisor Extraction Case with Invisalign  

PubMed Central

Mandibular incisor extraction for orthodontic treatment is considered an unusual treatment option because of the limited number of patients that meet the criteria for such treatment. Accurate diagnosis and treatment planning is essential to achieve the desired results. Adult orthodontic patients are increasingly motivated by esthetic considerations and reject the idea of conventional fixed appliances. In recent years, Invisalign appliances have gained tremendous attention for orthodontic treatment of adult patients to meet their esthetic demands. In this case report, a case of Class I malocclusion was treated with mandibular incisor extraction using the Invisalign appliance system. Successful tooth alignment of both arches was achieved. The use of Invisalign appliance is an effective treatment option in adult patients with Class I malocclusion that requires incisor extraction due to moderate to severe mandibular anterior crowding. PMID:25024852

Zawawi, Khalid H.

2014-01-01

168

Anatomosurgical study of the marginal mandibular branch of the facial nerve for submandibular surgical approach  

Microsoft Academic Search

The purpose of this study was to estimate the distance from the mandibular marginal branch of the facial nerve to the inferior margin of the mandible in order to determine the best and safest location to approach the posterior mandibular region. Forty-five hemi-faces of 27 Brazilian adult cadavers were dissected and the distance between the mandibular marginal branch and the

Marcus Woltmann; Ricardo de Faveri; Emerson Alexandre Sgrott

2006-01-01

169

Immediate functional loading of single-tooth TiO2 grit-blasted implant restoration. A controlled prospective study in a porcine model. Part II: Histology and histomorphometry  

Microsoft Academic Search

BACKGROUND: Evidently, there is a fast-moving shift from delayed to immediate implant loading. The hypothesis to be tested was that bone reactions adjacent to single TiO2-microthreaded implants exposed to immediate masticatory loading for 10 weeks after placement would modulate osseointegration. MATERIALS AND METHODS: Cylindrical- and tapered-designed implants (Astra Tech AB, Molndal, Sweden) replaced first and third mandibular premolars respectively in

Vasilios A. Bousdras; Frank Walboomers; John A. Jansen; James L. Cunningham; Gordon Blunn; Aviva Petrie; Siegfried Jaecques; Ignace E. Naert; Steen Sindet-Pedersen; Allen E. Goodship

2007-01-01

170

The animal experiment of a new optimised distraction implant.  

PubMed

Our aim was to evaluate the function of a new optimised distraction implant. Six dogs with alveolar bone defects had a total of 18 distraction, and 6 normal, implants inserted into edentulous mandibular ridges after osteotomy. Five days after insertion the distraction implants were activated at a rate of 1 mm/2 days to achieve a distraction height of 6mm. Radiographs were taken at 0, 1, 2, and 3 months after distraction. Two dogs were killed after 1, 2, and 3 months, respectively, and 12 distraction implants taken from the different time points were evaluated by microcomputed tomographic (MicroCT) scanning and histological examination. The other 6 distraction, and the 6 normal, implants were compared after osseointegration with a fatigue test. The results showed that all the distraction implants had successfully distracted the bone to the anticipated height. Radiographs showed that the density of the regenerated bone increased steadily during the consolidation period. MicroCT showed that the regenerated bone was comparable with the native bone 3 months after distraction. Both native and regenerated bone had osseointegrated histologically by 1 month and 3 months after distraction. The experiment successfully confirmed the usefulness and feasibility of this new distraction implant, and suggests interesting clinical uses. PMID:23601834

Shao, Bo; Sun, Yingying; Gao, Yuan; Li, Tao; Li, Yongfeng; Zhang, Yongqiang; Ge, Xu; Liu, Baolin; Kong, Liang

2013-12-01

171

Respiratory implantation cyst of the mandible following orthognathic surgery.  

PubMed

A cyst following implantation of respiratory epithelium during surgical procedures has been documented only rarely. A variety of names have been attached to this lesion: respiratory mucocele, respiratory implantation cyst, surgical ciliated cyst, and surgical (implantation) cyst. In seven prior case reports, the interval between the initiating surgical procedure and diagnostic biopsy of the resultant well-circumscribed radiolucency and histopathological demonstration of distinctive pseudostratified ciliated columnar epithelial lining has varied from 4 to 40 years. In the case reported here, chin augmentation used "residual maxillary bone" as the donor tissue and likely transplanted sinonasal mucosa into the mandible during orthognathic surgery, resulting in a painful anterior mandibular cyst lined by respiratory epithelium that was ablated 16 years later. PMID:21886995

Ragsdale, Bruce D; Laurent, Jessica L; Janette, Adam J; Epker, Bruce N

2009-01-01

172

Respiratory implantation cyst of the mandible following orthognathic surgery  

PubMed Central

A cyst following implantation of respiratory epithelium during surgical procedures has been documented only rarely. A variety of names have been attached to this lesion: respiratory mucocele, respiratory implantation cyst, surgical ciliated cyst, and surgical (implantation) cyst. In seven prior case reports, the interval between the initiating surgical procedure and diagnostic biopsy of the resultant well-circumscribed radiolucency and histopathological demonstration of distinctive pseudostratified ciliated columnar epithelial lining has varied from 4 to 40 years. In the case reported here, chin augmentation used “residual maxillary bone” as the donor tissue and likely transplanted sinonasal mucosa into the mandible during orthognathic surgery, resulting in a painful anterior mandibular cyst lined by respiratory epithelium that was ablated 16 years later. PMID:21886995

Ragsdale, Bruce D; Laurent, Jessica L; Janette, Adam J; Epker, Bruce N

2009-01-01

173

[On eruption of mandibular third molar after extraction of mandibular first or second molar].  

PubMed

In the orthodontic practice, the first or second molars are extracted by reason of a necessity based on the treatment planning. In these cases, it is desirable that the third molar would be taken part in the masticatory function. This study was made to investigate the natural movement of the erupting third molars after the extraction of the first or second molar on the serial lateral cephalometric radiographs and orthopantomographs. Subjects were divided into three groups. The first is the group which the mandibular second molars were extracted. The second is the group which the first molars were extracted bringing about the successful eruption of the third molars. The third is the group which the first molars were extracted with resultant in the failure of the third molar eruption. In all cases, the orthodontic forces were not applied to the third molars. The results were as follows: 1. In the first group, all third molars were successfully erupted and a lot of the spaces after the extraction of second molars were utilized for the eruption of third molars. 2. In the second group, all third molars were successfully erupted and a lot of the spaces after the extraction of first molars were utilized for the mesial movement of the second molars. 3. In the third group, there were various patterns of the impaction of the third molars. It was suggested that the eruption of the third molar was related to the space distal to the second molar but it was not related to the anterio-posterior length of the mandibular body significantly. PMID:2133887

Yamabe, K; Kouguchi, M; Watanabe, Y; Yamauchi, K

1990-08-01

174

Implant Chips  

NSDL National Science Digital Library

A group of eight people, including all members of one Florida family, had an implant chip, roughly the size of a grain of rice, injected under their skin on Friday, May 10. Manufactured by Applied Digital Solutions (ADS), the chips store a special identification number that enables the retrieval of personal and medical information. In the event of a medical emergency, a special handheld scanner activates the dormant digital implant, which provides identification data with which medical personnel can query ADS's database, the location of the patient's medical records. Alzheimer's patients seem to be the most promising market for this technology, even though other people, like the Florida family, hope to benefit from it as well. Another product that ADS offers is called Digital Angel, a wearable global positioning system (GPS) device that, among other things, can track in real time the wearer's physical movements. In the future, ADS is planning to release a product that will utilize both of these technologies: an implanted GPS-enabled chip. Unlike VeriChip, though, the GPS-enabled implant would require Food and Drug Administration (FDA) approval, meaning the US market won't see its introduction until after FDA testing. Many organizations, ranging from privacy advocates to religious groups, have already denounced VeriChip and its eventually successors, associated them with "Big Brother" and the biblical "Mark of the Beast."To read about the eight people that received their implants, look at the first and second sites, articles from the Los Angeles Times and Miami Herald respectively. For a non-US perspective, view the news story posted by the British Broadcasting Company (BBC). The fourth site, an extensive analysis of the subject from ABC News, should give readers a broader understanding of implanted chips and their potential uses. Two sites from ADS are next -- VeriChip's product pages and the press release that details a FDA's decision regarding VeriChip in April, 2002. Finally, the last two sites give more information on Digital Angel and a sample of GPS technology already in use.

Schroeder, Ted.

2002-01-01

175

Error analysis of a CAD/CAM method for unidirectional mandibular distraction osteogenesis in the treatment of hemifacial microsomia.  

PubMed

Our aim was to investigate the errors in a computer-aided design and manufacture (CAD/CAM) method of unidirectional mandibular distraction osteogenesis. Six patients with hemifacial microsomia were selected, and studied on computed tomographic (CT) scans taken at 3 time intervals: preoperatively, at the end of the latent period, and at the end of consolidation. The plan for mandibular distraction osteogeneisis was designed using CT-based 3-dimensional visible software. The osteotomy line and site of the drill were transferred to a rapid prototyping surgical guide. The osteotomy of the mandible and implantation of the distraction device were completed under guidance. The accuracy of the transferred surgical plan was confirmed by fusion of images after the latency period. The 3-dimensional superimposition of the preoperative simulation, and the postoperative actual models at the end of consolidation, showed that the mean (SD) error between the actual and the predicted height of the ramus was 0.6 (0.6) mm. The error between the actual and predicted intercondylar distance was 8.1 (2.1) mm. There was a significant difference in intercondylar distance between the simulated and actual groups (p=0.00024). The 3-dimensional CT-based planning system described in this paper was transferred precisely from the virtual plan to the real-time operation. The planning system also gave a precise prediction of the height of the ramus after mandibular distraction osteogenesis. However, because of the pull of the lateral pterygoid muscle and pseudarthrosis, the intercondylar distance decreased compared with the predicted value. These influencing factors should be considered when the planning system is refined. PMID:23583007

Sun, Hao; Li, Biao; Zhao, Zeliang; Zhang, Lei; Shen, Steve G F; Wang, Xudong

2013-12-01

176

Comparative evaluation of micro-implant and headgear anchorage used with a pre-adjusted appliance system.  

PubMed

The aim of this study was to compare and evaluate the anchorage effectiveness of using either micro-implants or extraoral headgear with the McLaughlin-Bennett-Trevisi (MBT) system. Thirty young Chinese adults (14 males and 16 females) aged 18-22 years with anterior bimaxillary protrusion were divided randomly into two equal groups, treated with the MBT system anchored by either micro-implants or headgear. Nine measurements obtained before and after treatment from lateral cephalometric radiographs were assessed for the two groups, using the Mann-Whitney U test with alpha = 0.05 for statistical significance. The maxillary incisors in the micro-implant group were significantly more retracted and intruded, while the lower incisors were more lingually inclined, than in the headgear group. The occlusal and mandibular planes were rotated more counterclockwise in the micro-implant group than in the headgear group (P < 0.05). Compared with headgear anchorage, micro-implant anchorage may counteract clockwise rotation of the occlusal and mandibular planes and result in different final positions for the maxillary and mandibular incisors. PMID:18540016

Ma, Junqing; Wang, Lin; Zhang, Weibing; Chen, Wenjing; Zhao, Chunyang; Smales, Roger J

2008-06-01

177

Contraceptive Implants  

Microsoft Academic Search

Subdermal contraceptive implants offer women long-acting, controlled release of progestins. Over the past 20 years, they have\\u000a been approved in more than 60 countries and used by more than 11 million women worldwide. Their high efficacy along with ease\\u000a of use make them a good contraceptive option for women who require progestin-only methods because they should not use estrogen,\\u000a teens

Philip D. Darney

178

[Local hypothermia in the immediate posttraumatic period in mandibular fractures].  

PubMed

In patients with mandibular fractures the early posttraumatic complications were prevented using local hypothermia with ALG-2M device and special applicators which ensured an uniform cooling of tissues adjacent to fractured zone. Moderate local hypothermia of +28 to +32 degrees centigrade caused the pain-relieving and antiswelling effects, as electrophysiological investigations proved. PMID:2815123

Malevich, O E; Komok, A S

1989-01-01

179

Influence of mastication and edentulism on mandibular bone density.  

PubMed

The aim of this study was to demonstrate that external loading due to daily activities, including mastication, speech and involuntary open-close cycles of the jaw contributes to the internal architecture of the mandible. A bone remodelling algorithm that regulates the bone density as a function of stress and loading cycles is incorporated into finite element analysis. A three-dimensional computational model is constructed on the basis of computerised tomography (CT) images of a human mandible. Masticatory muscle activation involved during clenching is modelled by static analysis using linear optimisation. Other loading conditions are approximated by imposing mandibular flexure. The simulations predict that mandibular bone density distribution results in a tubular structure similar to what is observed in the CT images. Such bone architecture is known to provide the bone optimum strength to resist bending and torsion during mastication while reducing the bone mass. The remodelling algorithm is used to simulate the influence of edentulism on mandibular bone loss. It is shown that depending on the location and number of missing teeth, up to one-third of the mandibular bone mass can be lost due to lack of adequate mechanical stimulation. PMID:23682930

Chou, Hsuan-Yu; Satpute, Devesh; Müftü, Ali; Mukundan, Srinivasan; Müftü, Sinan

2015-02-01

180

Epithelial odontogenic ghost cell tumour of the mandibular gingiva  

Microsoft Academic Search

The epithelial odontogenic ghost cell tumour (EOGCT) is considered as a solid `neoplastic' variant of the calcifying odontogenic cyst and is an uncommon lesion for which various names have been proposed over the years. We describe here an extraosseous case occurring on the edentulous mandibular gingiva in the right bicuspid area of a 70-year-old woman. The lesion was a painless

T Lombardi; R Küffer; R Di Felice; J Samson

1999-01-01

181

A permanent mandibular second molar with seven root canal systems.  

PubMed

This case report illustrates the nonsurgical endodontic management of a seven-canaled mandibular second molar. The root canal configuration presented as four mesial and three distal canals. Identification of the canal system was made with the aid of magnification, ultrasonics, and multiple angulated radiographs. Postoperative examination at 18 months showed a clinically asymptomatic tooth with resolution of the periapical pathology. PMID:24634902

Kottoor, Jojo; Paul, Kuriachan Kottanathu; Mathew, Joy; George, Saira; Mathew, Jain; Roy, Arun

2014-05-01

182

Repeated mandibular lengthening in Treacher Collins syndrome: a case report  

Microsoft Academic Search

A patient with mandibular hypoplasia associated with Treacher Collins syndrome was treated by bilateral distraction osteogenesis. Since less than optimal length was provided by the first distraction, a second corticotomy was performed in the newly formed bone 6 months after the first distraction. Thus, bone gained by distraction osteogenesis was subjected to distraction once again. New bone formation occurred after

Oya Kocabalkan; Gürsel Leblebicio?lu; Yücel Erk; Ayhan Enacar

1995-01-01

183

Ultrastructure of the platypus and echidna mandibular glands.  

PubMed

The secretory units of the platypus and echidna mandibular glands consist of a single serous cell type. Secretory granules within the cells of the platypus mandibular gland stained intensely with the periodic acid-Schiff staining procedure but failed to stain with Alcian Blue, suggesting the granules contained neutral glycoproteins. Secretory granules within the mandibular glands of the echidna failed to stain with the methods used indicating little if any glycoprotein was associated with the secretory granules. Ultrastructurally, secretory granules of the platypus mandibular gland were electron dense with a central core of less electron-dense material and were membrane bound. In contrast, those of the echidna presented a lamellated appearance and also were limited by a membrane. These secretory granules appeared to form as a result of concentric layering of lamellae within cisternae of the Golgi membranes. The intralobular ductal system of the platypus was more extensively developed than that of the echidna. The striated ducts of both species were characterized by elaborate infoldings of the basolateral plasmalemma and an abundance of associated mitochondria. PMID:21671995

Krause, W J

2011-10-01

184

The application of the Risdon approach for mandibular condyle fractures  

PubMed Central

Background Many novel approaches to mandibular condyle fracture have been reported, but there is a relative lack of reports on the Risdon approach. In this study, the feasibility of the Risdon approach for condylar neck and subcondylar fractures of the mandible is demonstrated. Methods A review of patients with mandibular condylar neck and subcondylar fractures was performed from March 2008 to June 2012. A total of 25 patients, 19 males and 6 females, had 14 condylar neck fractures and 11 subcondylar fractures. Results All of the cases were reduced using the Risdon approach. For subcondylar fractures, reduction and fixation with plates was done under direct vision. For condylar neck fractures, reduction and fixation was done with the aid of a trochar in adults and a percutaneous threaded Kirschner wire in children. There were no malunions or nonunions revealed in follow-up care. Mild transient neuropraxia of the marginal mandibular nerve was seen in 4 patients, which was resolved within 1–2 months. Conclusions The Risdon approach is a technique for reducing the condylar neck and subcondylar fractures that is easy to perform and easy to learn. Its value in the reduction of mandibular condyle fractures should be emphasized. PMID:23829537

2013-01-01

185

[Cost-effectiveness when treating an edentulous mandible].  

PubMed

When treating an edentulous patient with complaints of unsatisfactory retention of his complete mandibular denture, various treatment options are available: a new conventional denture, an implant-supported overdenture, and an implant-supported fixed partial denture. Important considerations during the decision-making process are patient satisfaction, cost of denture fabrication, and cost of maintenance. The outcome of the diagnostic procedure will have financial consequences. On that basis, a satisfactory treatment plan can be established and carried out. The need exists for a protocol which takes into account cost-effectiveness and is useful in selecting the appropriate treatment option, adjusted to individual requirements. PMID:22497091

van Zeghbroeck, L

2012-03-01

186

A comparative analysis of periimplant bone levels of immediate and conventionally loaded implants  

PubMed Central

Background With the trend of shortening the treatment time and reducing patient discomfort/inconveniences immediate loading of implants has emerged as an alternative approach for replacing missing natural teeth. The aim of this study is to evaluate and compare the effectiveness of immediate implant loading protocol over conventional implant loading protocol in partially edentulous mandible. Methods Twenty patients were selected from out patients department who needed the replacement of one of the missing mandibular first molar. They were divided into two groups. In Group A patients implants were loaded with immediate implant loading protocol, whereas in Group B they were loaded with conventional loading protocol. Periimplant bone loss and soft tissue health were measured and compared using OPG and IOPA radiographs 06 and 12 months after implant placement. Results One implant failed in immediate loading group (Group A), whereas all implants survived in conventional loading group (Group B). The average periimplant bone loss after 6 months and 1 year for Group A were 0.69 mm and 1.09 mm respectively, whereas it was 0.74 mm and 1.13 mm respectively for Group B. The difference in the bone loss between Group A and B was not statistically significant. Conclusion Immediate implant loading protocol has a highly acceptable clinical success rate in partially edentulous lower jaw although implant survival rate is slightly inferior to conventional loading protocol. PMID:24532933

Guruprasada; Thapliyal, G.K.; Pawar, V.R.

2012-01-01

187

Comparative analysis between direct Conventional Mandibular nerve block and Vazirani-Akinosi closed mouth Mandibular nerve block technique  

NASA Astrophysics Data System (ADS)

Introduction: Over the years different techniques have been developed for achieving mandibular nerve anaesthesia. The main aim of our study was to carry out comparison and clinical efficacy of mandibular nerve anaesthesia by Direct Conventional technique with that of Vazirani-Akinosi mandibular nerve block technique.Materials and Methods: 50 adult patients requiring surgical extraction of premolars, mandibular first, second and third molars were selected randomly to receive Direct Conventional technique and Vazirani- Akinosi technique for nerve block alternatively.Results: No statistically significant differences were observed regarding complete lip anaesthesia at 5 minutes and 10 minutes, nerves anaesthetized with single injection, effectiveness of anaesthesia, supplementary injections and complications in both the techniques. However, onset of lip anaesthesia was found to be faster in Vazirani-Akinosi technique, patients experienced less pain during the Vazirani-Akinosi technique as compared to the Direct Conventional technique. Post injection complication complications were less in the VaziraniAkinosi Technique.Conclusions: Except for faster onset of lip anaesthesia, less pain during injection and fewer post injection complications in Vazirani-Akinosi technique all other parameters were of same efficacy as Direct Conventional technique. This has strong clinical applications as in cases with limited mouth opening, apprehensive patients Vazirani-Akinosi technique is the indicated technique of choice.

Mishra, Sobhan; Tripathy, Ramanupam; Sabhlok, Samrat; Panda, Pankaj Kumar; Patnaik, Satyabrata

2012-11-01

188

Osseointegrated dental implants in growing children: a literature review.  

PubMed

Edentulism is usually associated with the aging patient. However, total or partial tooth loss also affects young individuals, mainly as a result of trauma, decay, anodontia, or congenital and acquired jaw defects involving the alveolar processes. For elderly patients, the use of oral implants has become an accepted treatment modality for edentulism, and most of today's knowledge regarding implants is based on such practice. There has been hesitation to perform implant therapy for growing children; hence, few children to date have been provided with implant-supported construction. Consequently, little is known about the outcome of the osseointegration procedure in young patients, and until now, only a limited number of case presentations have been reported. This article reviews the current literature to discuss the use of dental implants in growing patients and the influence of maxillary and mandibular skeletal and dental growth on the stability of those implants. The literature review was performed through Science Direct, Wileys Blackwell Synergy, PubMed, Google, Embase, Medknow publications, and Springer for references published from 1963 to 2011. It is recommended to wait for the completion of dental and skeletal growth, except for severe cases of ectodermal dysplasia. PMID:22214484

Mankani, Nivedita; Chowdhary, Ramesh; Patil, Brijesh A; Nagaraj, E; Madalli, Poornima

2014-10-01

189

Increased Crown-To-Implant Ratio May Not Be a Risk Factor for Dental Implant Failure under Appropriate Plaque Control  

PubMed Central

Objective The aim of this study was to evaluate whether increased crown-to-implant (C/I) ratio influences implant stability or not under proper healthy control of peri-implant mucosa. The hypothesis of this study is that implant stability can be maintained despite High C/I, under appropriate plaque control. Materials and Methods Five male Beagle-Labrador hybrid dogs (2 years old) were used. Their bilateral mandibular premolar extraction was performed. After allowing 12 weeks for bone healing, 3 types of vertical marginal bone loss were simultaneously prepared randomly. Then, 30 titanium implants were placed in the edentulous areas and defined as High C/I, Mid C/I and Low C/I groups. This time point was designated as the baseline (0 Week). Twelve weeks after implant placement, metal superstructures were cemented to the implants and an occlusal plate was set at the opposite side. At the same time, Calcein green was injected for remodeling evaluation. Implants were loaded by feeding the dogs a hard pellet diet. Tooth brushing was performed 5 days per week during the study to maintain healthy peri-implant mucosa. Twenty-four weeks following implant placement, the interface structure was evaluated clinically, radiologically, and histologically. Result Implant stability quotient (ISQ) increased with time in all 3 groups, without any significant correlation with the C/I value (p>0.05). Moreover, mean marginal bone loss adjacent around implants in all 3 groups ranged between 0.11 and 0.19 mm, with no significant difference (p>0.05). Many fluorescence-labeled bones are shown in the High C/I group. It is considered that high remodeling activity prevent marginal bone loss in the High C/I group and this may provide favorable implant stability under proper plaque control. Conclusion These findings suggest that increased C/I may not be a risk factor for implant failure if the peri-implant mucosa is kept healthy, as was the case in this animal model. PMID:23737960

Okada, Shinsuke; Koretake, Katsunori; Miyamoto, Yasunari; Oue, Hiroshi; Akagawa, Yasumasa

2013-01-01

190

Conservative orthodontic treatment of mandibular bilateral condyle fracture.  

PubMed

Maxillofacial trauma is rare in children younger than the age of 5 years (range 0.6%-1.2%), and they can require different clinical treatment strategies compared with fractures in the adult population because of concerns regarding mandibular growth and development of dentition. A 5-year-old girl with a history of falling from a bicycle 7 hours earlier was referred to the department of oral and maxillofacial surgery. Multislice computed tomographic examination demonstrated a bilateral fracture of the mandibular condyle neck associated with minimal fracture of the alveolar ridge of the maxilla. The multislice computed tomographic scan also demonstrated dislocation on the right condyle neck and, on the left side, a medial inclination of approximately 45 degrees associated with greenstick fracture of the right parasymphysis region. In this particular case, orthodontic rubber elastics in combination with fixed orthodontic brackets provided good results in the treatment of bilateral condyle neck fractures associated with greenstick fracture of parasymphysis. PMID:25098573

Gašpar, Goran; Brakus, Ivan; Kova?i?, Ivan

2014-09-01

191

Alveolar ridge changes in patients congenitally missing mandibular second premolars.  

PubMed

This study investigated changes in ridge width over time in patients who were congenitally missing mandibular second premolars. Data were obtained from stone casts and radiographs of 35 edentulous sites on 22 patients representing three time periods: (1) before extraction of the primary mandibular second molar, (2) completion of orthodontic treatment, and (3) long-term evaluation. The findings indicate that ridge width decreases 25% within 3 years after primary molar extraction. The rate of decrease diminishes to 4% over the next 3 years. The change in ridge width had a weak association with the age of the patient at the time of the extraction but a small predictive value. No correlation was found between changes in ridge width and height and the time since the extraction or the age of the patient at the time of extraction. PMID:8126668

Ostler, M S; Kokich, V G

1994-02-01

192

Free greater omental flap for treatment of mandibular osteoradionecrosis  

SciTech Connect

Osteoradionecrosis can involve the mandible following radical irradiation for treatment of oral cavity cancer. The radionecrosis of the mandible is often associated with severe intractable pain, local or extensive deformity, including pathologic fracture, orocutaneous fistula formation, and frequent loss of function. Treatment has ranged from analgesia and antibiotics to hyperbaric oxygen treatments to local or extensive sequestrectomies with partial or total mandibulectomy and restoration of tissue losses with unirradiated tissue. To our knowledge, this is the first report of the successful use of a free greater omental flap for immediate treatment of mandibular osteoradionecrosis and concomitant reconstruction. We found the omentum to be an excellent vascular bed that rapidly resolved the osteoradionecrosis and pain, promoted healing, and restored mandibular function with minimal discomfort to the patient.

Moran, W.J.; Panje, W.R.

1987-04-01

193

Histologic and immunohistochemical description of early healing at marginal defects around implants.  

PubMed

This study reports on the histologic characteristics of the early phases of implant osseointegration, focusing on osteopontin concentrations in the coronal area of implants placed with marginal defects and in control sites without defect preparation. In the mandibular right area of 12 dogs, two recipient sites were prepared and the margins were widened to obtain a gap of 0.5 mm at one site (small defect) and 1.25 mm at another site (large defect). Implants were placed and allowed a fully submerged healing. The procedure was subsequently performed in the left side in such a way as to obtain healing times of 5, 10, 20, and 30 days. Paraffin sections were stained with osteopontin antibodies and analyzed. At control implants, scarcely organized collagen fibers were observed in the space between the pristine bone and implant and were quickly replaced by mineralized tissue. In the small and large defects, the collagen fibers were organized in a layer that ran parallel to the implant at day 10 and became denser and thicker with time. Osteopontin was evenly distributed in the peri-implant tissue at control implants, while it was mainly located in the collagen bundle section around the implants placed in the defects. PMID:24804295

Carmagnola, Daniela; Botticelli, Daniele; Canciani, Elena; Rossi, Fabio; Milani, Stefano; Dellavia, Claudia

2014-01-01

194

Severe skeletal Class III malocclusion treated with 2-stage orthognathic surgery with a mandibular step osteotomy.  

PubMed

To reduce a large amount of mandibular setback and to prevent pharyngeal airway space narrowing when correcting a severe anteroposterior skeletal discrepancy, a mandibular step osteotomy is often combined with 2-stage orthognathic surgery. This case report describes a successful 2-stage orthognathic treatment combined with a mandibular step osteotomy. A 20-year-old man had severe mandibular protrusion, facial asymmetry, and macroglossia. Phase 1 surgery included the mandibular step osteotomy and a partial glossectomy; then we performed phase 2 surgery with a 2-piece LeFort I segmental osteotomy and a bilateral intraoral vertical ramus osteotomy to correct the patient's mandibular protrusion and facial asymmetry. The total treatment period was 30 months, and the final result was improvement of the patient's facial appearance. PMID:24680021

Choi, Sung-Hwan; Kang, Da-Young; Kim, Young-Hoon; Hwang, Chung-Ju

2014-04-01

195

Segmental mandibular bone reconstruction with a carbonate-substituted hydroxyapatite-coated modular endoprosthetic poly(?-caprolactone) scaffold in Macaca fascicularis.  

PubMed

A bio-degradable scaffold incorporating osteoinductive factors is one of the alternative methods for achieving the regeneration of a mandibular bone defect. The current pilot study addressed such a bone reconstruction in a non-human primate model, Macaca fascicularis monkeys, with an engineered poly(?-caprolactone) (PCL) scaffold, provided with a carbonate-substituted hydroxyapatite coating. The scaffolds were implanted into unilaterally created mandibular segmental defects in 24 monkeys. Three experimental groups were formed: (1) scaffolds with rhBMP-2 (n = 8), (2) scaffolds with autologous mixed bone marrow cells (n = 8), and (3) empty scaffolds as a control group (n = 8). Evaluation was based on clinical observation as well as micro-CT, mechanical, and histological analyses. Despite a high infection rate, the overall results showed that the currently designed PCL scaffolds had insufficient load-bearing capability, and complete bone union was not achieved after 6 months of implantation. Nevertheless, the group of PCL scaffolds loaded with rhBMP-2 showed evidence of bone-regenerative potential, in contrast to PCL with autologous mixed bone marrow cells and the control group. PMID:24259321

Chanchareonsook, Nattharee; Tideman, Henk; Feinberg, Stephen E; Jongpaiboonkit, Leenaporn; Lee, Shermin; Flanagan, Colleen; Krishnaswamy, Gita; Jansen, John

2014-07-01

196

Five Canalled and Three-Rooted Primary Second Mandibular Molar  

PubMed Central

A thorough knowledge of root canal anatomy and its variation is necessary for successful completion of root canal procedures. Morphological variations such as additional root canals in human deciduous dentition are rare. A mandibular second primary molar with more than four canals is an interesting example of anatomic variations, especially when three of these canals are located in the distal root. This case shows a rare anatomic configuration and points out the importance of looking for additional canals. PMID:25147744

Selvakumar, Haridoss; Kavitha, Swaminathan; Bharathan, Rajendran; Varghese, Jacob Sam

2014-01-01

197

Fixation of zygomatic and mandibular fractures with biodegradable plates  

PubMed Central

Context: In this prospective study, 13 randomly selected patients underwent treatment for zygomatic–complex fractures (2 site fractures) and mandibular fractures using 1.5 / 2 / 2.5-mm INION CPS biodegradable plates and screws. Aims: To assess the fixation of zygomatic-complex and mandibular fractures with biodegradable copolymer osteosynthesis system. Materials and Methods: In randomly selected 13 patients, zygomatic-complex and mandibular fractures were plated using resorbable plates and screws using Champy's principle. All the cases were evaluated clinically and radiologically for the type of fracture, need for the intermaxillary fixation (IMF) and its duration, duration of surgery, fixation at operation, state of reduction at operation, state of bone union after operation, anatomic reduction, paresthesia, occlusal discrepancies, soft tissue infection, immediate and late inflammatory reactions related to biodegradation process, and any need for the removal of the plates. Statistical Analysis Used: Descriptives, Frequencies, and Chi-square test were used. Results: In our study, the age group range was 5 to 55 years. Road traffic accidents accounted for the majority of patients six, (46.2%). Postoperative occlusal discrepancies were found in seven patients as mild to moderate, which resolved with IMF for 1-8 weeks. There were minimal complications seen and only as soft tissue infection. Conclusions: Use of biodegradable osteosynthesis system is a reliable alternative method for the fixation of zygomatic-complex and mandibular fractures. The biodegradable system still needs to be refined in material quality and handling to match the stability achieved with metal system. Biodegradable plates and screws is an ideal system for pediatric fractures with favorable outcome. PMID:23662255

Degala, Saikrishna; Shetty, Sujeeth; Ramya, S

2013-01-01

198

Fixation of mandibular fractures with biodegradable plates and screws  

Microsoft Academic Search

Objective. Little data exist regarding the use of biodegradable plates and screws for the internal fixation of human mandibular fractures. The purpose of this study was to evaluate the stability of biodegradable, self-reinforced poly-L-lactide plates and screws for the internal fixation of fractures of the human mandible. Study Design. Twenty-two individuals (14 male, 8 female; average age, 26.3 years) with

Kaan C. Yerit; Georg Enislidis; Christian Schopper; Dritan Turhani; Felix Wanschitz; Arne Wagner; Franz Watzinger; Rolf Ewers

2002-01-01

199

Extrusion of impacted mandibular second molar using removable appliance  

PubMed Central

The purpose of this article is to review the principles of case management of impacted mandibular molars and to illustrate their potential to respond well to treatment. Although the scope of treatment may be influenced by the patient's age, past dental history, severity of impaction, dentoalveolar development, and root form, the case reports demonstrate the inherent potential for good treatment outcome even in the most unfavorable circumstances.

Karthikeyan, M. K.; Prabhakar, Ramachandran; Saravanan, R.; Vikram, N. Raj; Kumar, R. Vinoth; Prasath, R. Eshwara

2014-01-01

200

Accuracy of perioperative mandibular positions in orthognathic surgery.  

PubMed

Mandibular position is an important parameter used for the diagnosis of dentofacial deformities, as well as for orthognathic surgery planning and execution. Centric relation (anterior and superior relationship of the mandibular condyles interposed by the thinnest portion of their disks against the articular eminencies), centric occlusion (when lower teeth contact upper teeth at centric relation), and maximal intercuspation (complete interdigitation of lower and upper teeth) are not often addressed as factors that influence the results of orthognathic surgery, although these relationships are critical to ensure accuracy during the surgery. The present study assessed occlusal measurements taken before and after the induction of general anaesthesia from consecutive orthognathic surgery subjects. The variables assessed included the differences between these occlusal measurements, patient age, gender, type of deformity, and type of proposed orthognathic surgical procedure. The results demonstrated statistically significant differences for mandibular retrusion from maximal intercuspation to centric occlusion position, whereas the mandible appeared not to change significantly from centric occlusion after the induction of general anaesthesia. Patient age and the type of deformity appeared to influence the results. While in most instances centric occlusion can be adequately reproduced under general anaesthesia, for some specific orthognathic cases more accurate results might be obtained if the mandible-first sequence is used. PMID:24880211

Borba, A M; Ribeiro-Junior, O; Brozoski, M A; Cé, P S; Espinosa, M M; Deboni, M C Z; Miloro, M; Naclério-Homem, M G

2014-08-01

201

Endoscopic Removal of a Supernumerary Premolar in the Mandible during a Dental Implant Placement  

PubMed Central

The surgical removal of supernumerary teeth is necessary in some cases, especially before the commencement of any orthodontic or implant treatment procedure. In the mandibular supernumerary premolar, a more conservative approach is required because of the presence of complications associated with conventional surgery due to the close proximity of the said premolar to the alveolar inferior and mental nerves, and the need for bone conservation for implant placement. The endoscopic surgical approach has been used for the removal of the maxillary supernumerary tooth, impacted third molar, and implants. In this case report, we present an endoscopically assisted surgical technique for the removal of an unerupted supernumerary premolar in the mandible associated with a dental implant placement procedure. PMID:24772355

Beltran, Victor; Cantin, Mario; Fuentes, Ramon; Engelke, Wilfried

2014-01-01

202

Mandibular third molar development after mantle radiation in long-term survivors of childhood Hodgkin's disease  

SciTech Connect

Sequential panoramic radiographs were assessed for mandibular third molar development in 47 long-term survivors of childhood Hodgkin's disease after treatment with 37 Gy mantle field radiation. To make a comparison, panoramic radiographs of 149 healthy, nonirradiated children were reviewed for the presence of mandibular third molars. In children between the ages of 7 and 12 years, bilateral agenesis of mandibular third molars was more frequent in patients who had been treated with mantle radiation than in nonirradiated patients. Unilateral agenesis, crown hypoplasia, and root growth impairment of mandibular third molars were also found. Similar, apparent, radiation-induced developmental anomalies were noted in maxillary third molars of the irradiated patients.

McGinnis, J.P. Jr.; Hopkins, K.P.; Thompson, E.I.; Hustu, H.O.

1987-05-01

203

Biologic stability of plasma ion-implanted miniscrews  

PubMed Central

Objective To gain basic information regarding the biologic stability of plasma ion-implanted miniscrews and their potential clinical applications. Methods Sixteen plasma ion-implanted and 16 sandblasted and acid-etched (SLA) miniscrews were bilaterally inserted in the mandibles of 4 beagles (2 miniscrews of each type per quadrant). Then, 250 - 300 gm of force from Ni-Ti coil springs was applied for 2 different periods: 12 weeks on one side and 3 weeks contralaterally. Thereafter, the animals were sacrificed and mandibular specimens including the miniscrews were collected. The insertion torque and mobility were compared between the groups. The bone-implant contact and bone volume ratio were calculated within 800 µm of the miniscrews and compared between the loading periods. The number of osteoblasts was also quantified. The measurements were expressed as percentages and analyzed by independent t-tests (p < 0.05). Results No significant differences in any of the analyzed parameters were noted between the groups. Conclusions The preliminary findings indicate that plasma ion-implanted miniscrews have similar biologic characteristics to SLA miniscrews in terms of insertion torque, mobility, bone-implant contact rate, and bone volume rate. PMID:23814706

Cho, Young-Chae; Cha, Jung-Yul; Hwang, Chung-Ju; Park, Young-Chel; Jung, Han-Sung

2013-01-01

204

Implants and sinus-inlay graft in a 1-stage procedure in severely atrophied maxillae: prosthodontic aspects in a 3-year follow-up study.  

PubMed

The aim of this 3-year prospective study was to evaluate the prosthetic treatment in 2 groups of maxillary edentulous patients with similar age and gender distribution: a study group of 39 patients treated with intra-sinus block bone grafts and implants in a 1-stage procedure, and a control (reference) group of 37 patients treated with implants and no grafting. In the study group, bone volumes were regarded as insufficient for implant treatment unless a bone grafting procedure was performed (posterior alveolar bone height was less than 5 mm). Self-tapping Nobel Biocare implants were used in both groups of patients. In the study group, 35 fixed partial dentures and 4 overdentures were placed, and in the control group 34 fixed partial dentures and 3 overdentures were placed. All patients were followed for at least 3 years. The 3-year follow-up examination included examination of a number of clinical parameters as well as the type of abutment and evaluation of stability of prosthesis retention screws and abutment screws. During the follow-up period, 2 patients were lost from the study group and 4 patients from the control group, giving a total of 70 patients available for examination after 3 years (8% dropout rate). Both the amount of plaque and gingival bleeding were significantly lower in the study group than in the control group. The presence of attached gingiva was 25% in the study group and 35% in the control group. The number of angulated abutments was significantly higher in the study group than in the control group. There was no significant difference in the number of prosthetic complications in the 2 groups of patients. Neither was there any significant difference in prosthesis screw or abutment screw stability between the 2 groups. The type of abutment did not significantly influence the stability of prosthesis retention screws or abutment screws in either of the groups. However, prosthesis screw stability was significantly greater than abutment screw stability in both groups of patients. It can be concluded that the prosthetic outcome was similar in the 2 groups of patients, regardless of whether or not a bone grafting procedure was used. PMID:11669249

Smedberg, J I; Johansson, P; Ekenbäck, D; Wannfors, D

2001-01-01

205

Implant success!!!.....simplified.  

PubMed

The endeavor towards life-like restoration has helped nurture new vistas in the art and science of implant dentistry. The protocol of "restoration-driven implant placement" ensures that the implant is an apical extension of the ideal future restoration and not the opposite. Meticulous pre-implant evaluation of soft and hard tissues, diagnostic cast and use of aesthetic wax-up and radiographic template combined with surgical template can simplify the intricate roadmap for appropriate implant treatment.By applying the harmony of artistic skill, scientific knowledge and clinical expertise, we can simply master the outstanding implant success in requisites of aesthetics, phonetics and function. PMID:20376237

Luthra, Kaushal K

2009-01-01

206

Norplant implants.  

PubMed

This letter to the editor is in response to 3 articles on the use of the Norplant implant contraceptive in The Indian Health Service (IHS) Provider. Norplant and the FDA-approved Depo-Provera now expand contraceptive options for women. All IHS and 638 sites might be able to offer both options. Several of the authors expressed concern regarding decreased Norplant effectiveness in heavier patients. Norplant is still more effective than any other currently available reversible contraceptive in the US at all weights. Many experts feel the current silastic capsule provides adequate hormone levels even in heavier women. The Crow Service Unit has initiated their Norplant program, although the Wyeth consent form seems unnecessarily extensive. The Albuquerque Service Unit consent form simply describes the procedure and confirms that patients have read and understand the fact sheet. The theoretical risk of thromboembolism is vastly outweighed by the potential benefit of reliable contraception in high risk alcoholic women, except perhaps in women with severe liver disease. While Norplant is expensive, programs need to consider the actual cost of a pregnancy, potential complications, and the financial and social costs of unintended pregnancy. For those in difficult straits, the manufacturer has set up a foundation for obtaining Norplant free of charge. Depo-Provera comes in a 150 mg dose vial that is given every 3 months. The mean time to ovulation is 4.5 months from the last dose. The adverse reaction spectrum is similar to Norplant as they are both progesterone-related agents. Providers and clinics should reduce barriers to family planning by giving out more pill packs at a time; letting adolescents who wish to delay their first pelvic exam have 3 months of pills without an exam; making condoms available in exam rooms rather than through pharmacy prescriptions; and increasing patient accessibility to the morning-after pill. PMID:12288838

Henley, E

1993-06-01

207

A rare report of mandibular facial talon cusp and its management  

PubMed Central

Talon cusp is an uncommon dental anomaly showing morphologically well delineated, accessory cusp-like structure projecting from cingulum to the incisal edge of anterior teeth. This anomaly is rare in the mandibular dentition and rarer on the facial aspect. A case of this infrequent entity of mandibular facial talon cusp and its management is reported here. PMID:25298658

Nuvvula, Sivakumar; Gaddam, Kumar Raja; Jayachandra, Bhumireddy; Mallineni, Sreekanth Kumar

2014-01-01

208

The Prevalence of Bilateral Three-Rooted Mandibular First Molar in Indian Population  

PubMed Central

Introduction The purpose of the present study was to evaluate the prevalence of bilateral three-rooted mandibular first and second molars in Indian population. Materials and Methods A total of 215 patients were screened bilaterally for mandibular first and second molar and 430 samples of periapical radiographs were obtained. The gender, symmetry, and prevalence of three-rooted mandibular first and second molars were recorded. The correlation between left and right side occurrences and distribution were recorded and analysed using Z-test. Results The results showed that 33 teeth had three-rooted mandibular first molars, 16 male and 17 female (P=0.442). Overall, 21 teeth of right jaw and 12 teeth of left jaw (P=0.103) showed presence of an extra-root. The prevalence of three-rooted mandibular first molars was 7.67% and second molar was 0.23%. The bilateral frequency distribution was 3.72% for the first molar. There was no statistically significant difference between right side and left side mandibular molars. Also, gender did not show a significant relationship with this variant. Conclusion The endodontic treatments of first mandibular molars require a careful clinical approach in Indian population as a high racial prevalence of 7.67% three-rooted molars was found. However, in the same population, 0.23% mandibular second molars had three roots. PMID:23922569

Karale, Rupali; Chikkamallaiah, Champa; Hegde, Jayshree; Aswathanarayana, Srirekha; Santhosh, Lekha; Bashetty, Kusum; Rajanna Susheela, Shwetha; Panchajanya, Srinivas

2013-01-01

209

An accurate method of predicting mandibular growth potential based on bone maturity  

Microsoft Academic Search

Mandibular growth prediction provides important information for planning treatment and for evaluating occlusal stability after treatment. At present, several methods can predict mandibular growth, but it is not clear which method is the most accurate. This study compared the predictive error of several methods by using skeletal maturity indicators. Twenty-two longitudinal cephalograms and hand-wrist radiographs of female subjects (average initial

Koshi Sato; Toshinori Mito; Hideo Mitani

2001-01-01

210

Lip closing force of Class III patients with mandibular prognathism: a case control study  

PubMed Central

Introduction To compare the lip closing force of patients with mandibular prognathism to that of patients without dentofacial anomalies. Methods The subject group included 62 female patients of Class III relationship with mandibular prognathism. The control group been comprised of 71 patients of Class I relationships without skeletal deformities. Maximum lip closing force and average lip closing force were measured using a Y-meter. Student’s t-test was carried out to analyse the differences between the groups. Correlation and stepwise multiple linear regression analyses were performed to analyse the relationship between lip closing force and craniofacial morphology. Results The lower lip closing force of subjects with mandibular prognathism was significantly greater than that of patients in the control group (P??0.05). The lower lip closing force of patients with mandibular prognathism was strongly correlated with IMPA (Lower Incisor - Mandibular Plane angle, P?Mandibular Plane angle, P?mandibular prognathism and was strongly correlated with lower incisor position and mandibular plane angle. PMID:25159036

2014-01-01

211

Endodontic Treatment of a Mandibular Second Premolar with Three Roots and Three Canals  

PubMed Central

Complex root canal system with atypical variations is a common finding among mandibular premolars. Endodontic treatment in these teeth may not be successful due to the failure to recognise and treat multiple canals. This paper presents endodontic treatment of a mandibular second premolar with three roots and three canals.

Paul, Bonny; Dube, Kavita

2014-01-01

212

Surgical treatment of recurrent mandibular dislocation by augmentation of the articular eminence with cranial bone  

Microsoft Academic Search

Purpose: This article describes the use of calvarial bone grafts to augment the height of the articular eminence to treat recurrent mandibular dislocation.Patients and Methods: Eight patients with mandibular recurrent dislocation were studied clinically, radiographically, and with magnetic resonance imaging (MRI) immediately before surgery, and at 1 week, 6 months, and 1 year after the operation. All the patients were

J Fernandez-Sanroman

1997-01-01

213

Mandibular changes in persons with untreated and treated Class II Division 1 malocclusion  

Microsoft Academic Search

The growth potential of individuals with Class II malocclusions is of interest to the practicing orthodontist because such malocclusions constitute a significant percentage of cases. The purpose of this study was to evaluate on cross-sectional and longitudinal bases the changes in mandibular length and relationship and maxillary-mandibular relationships in untreated Class II subjects from deciduous to permanent dentition and also

Samir E. Bishara

1998-01-01

214

The Root and Root Canal Morphology of the Human Mandibular First Premolar: A Literature Review  

Microsoft Academic Search

The purpose of this study was to undertake a comprehensive literature review of the root and root canal morphology of the mandibular first premolar. Published studies citing the anatomy and morphology of mandibular premolars report data for over 6,700 teeth. These studies were divided into anatomical studies reporting number of roots, number of canals, and apical morphology. Variations because of

Blaine M. Cleghorn; William H. Christie; Cecilia C. S. Dong

2007-01-01

215

Variation and Integration of the Simple Mandibular Postcanine Dentition in Two Species of Phocid Seal  

Microsoft Academic Search

Pinnipeds generally swallow prey whole, and most have simple, homodont, nonoccluding cheek teeth. We investigated whether cheek teeth in seals are more variable and weakly integrated than in terrestrial Carnivora. We measured mandibular length and crown length of mandibular postcanines (PCs) in ringed seals (Pusa hispida; n = 912) from the Canadian Arctic, and harp seals (Pagophilus groenlandicus; n =

Edward H. Miller; Ha-Cheol Sung; Valerie D. Moulton; Gary W. Miller; J. Kerry Finley; Garry B. Stenson

2007-01-01

216

Deflections in Mandibular Major Connectors: A FEM Study.  

PubMed

The major connector is the most vital component critically subjected to maximal stress concentration due to various forces acting on it. The main requirement of a major connector is its resistance to deformation by occlusal stresses. This resistance to deformation is a direct consequence of the rigidity of the major connector. Thus rigidity of the major connector is paramount to resist flexing and torquing forces that could be transmitted to the abutment teeth and other structures as destructive forces. The commonly used major connectors for the mandibular arch are lingual bar and lingual plate. In the present study, the deflection of various major connector designs due to occlusal load is assessed by finite element method. They have been analyzed through finite element models. The differences in the deflection behaviour of mandibular major connector used in Kennedy's Class I, Class II, Class III, and Class IV edentulous situations have been compared. A CT scan of human edentulous mandible was taken and each section from symphysis to condylar region was projected on a graph paper and three-dimensional volumes were created from connected successive profiles to define the final solid geometry of cortical bone. Six framework models with different mandibular major connectors, lingual bar and lingual plate for Kennedy's Class I, Class II, Class III, and Class IV situations were created. The three dimensional finite element models corresponding to the geometric model were generated using Ansys's pre-processor. The model was assigned material properties. A vertical biting force of 20 N was applied. The results showed that the maximum deflection was seen in the saddle area when compared to other areas, i.e., major connector and the occlusal rest regions. The lingual bar in Kennedy's Class III situation and lingual plate in Kennedy's Class IV situation showed the least deflection when compared to Class I and Class II (distal extensions) situations. Lingual plate is more rigid major connector than lingual bar. PMID:24431793

Satheesh Kumar, K S; Preeti, S K; Savadi, R; Patel, R; Vinod, V; John, J

2013-12-01

217

Asymmetric muscle function in patients with developmental mandibular asymmetry.  

PubMed

The aim was to test the hypothesis that developmental mandibular asymmetry is associated with increased asymmetry in muscle activity. Patients with mandibular condylar and/or ramus hyperplasia having unilateral cross-bite were compared with healthy subjects with normal occlusion. Muscle activity was recorded with surface electrodes in the masseter, suprahyoid, sternocleidomastoid muscle (SCM) and upper trapezius areas during jaw opening-closing-clenching, head-neck flexion-extension, and elevation-lowering of shoulders. Root mean square (RMS) and mean power frequency (MPF) values were calculated and analysed using anova and t-tests with P < 0.05 chosen as significance level. The SCM and masseter muscles showed co-activation during jaw and head movements, significantly more asymmetric in the patients than in the healthy subjects. The RMS and MPF values were higher in the patients than in the controls in the SCM and suprahyoid areas on both sides during jaw opening-closing movement. The results indicate that the ability to perform symmetric jaw and neck muscle activities is disturbed in patients with developmental mandibular asymmetry. This is of clinical interest because asymmetric activity may be an etiologic factor in temporomandibular joint and cervical pain. The results support that co-activation occurs between jaw and neck muscles during voluntary jaw opening and indicate that postural antigravity reflex activity occurs in the masseter area during head extension. Further studies, where EMG recordings are made from the DMA patients at early stages are motivated to verify activity sources and test if the asymmetric activity is associated with muscle and joint pain in the jaw and cervical areas. PMID:18190358

Dong, Y; Wang, X M; Wang, M Q; Widmalm, S E

2008-01-01

218

[Mandibular metastasis of a cutaneous melanoma or metachronous amelanotic melanoma of the oral cavity? A case report and literature review].  

PubMed

Primary and metastatic mandibular melanoma are extremely rare. We report the original case of a 55-year-old woman treated 16 years before for a cutaneous melanoma, and now presenting with a huge mandibular amelanotic melanoma. Was it an histologically different mandibular metastasis of the previous cutaneous melanoma, or a metachronous oral amelanotic melanoma? PMID:24503521

Vierne, C; Hardy, H; Guichard, B; Barat, M; Péron, J-M; Trost, O

2014-08-01

219

Worth syndrome as a diagnosis for mandibular osteosclerosis  

PubMed Central

This case report presents an unusual incidental radiographic finding on a dental panoramic radiograph that caused diagnostic confusion. A 46-year-old female presented with symmetrical sclerotic cortical thickening of the anterior mandible visible on radiograph, with no other major clinical examination findings. The patient subsequently showed no change in radiographic appearance over a 6 year period. Based on this evidence, and the benign nature of the history, we propose a diagnosis of Worth syndrome. This report aims to clarify the difference in terminology and presentation of two conditions known to produce mandibular osteosclerosis: Worth syndrome and Van Buchem disease, both of which are often quoted synonymously in the literature. PMID:22065804

Payne, K; Dickenson, A

2011-01-01

220

Audit on titanium reconstruction of mandibular defects for jaw lesions  

PubMed Central

Aims: The aim of the study is to audit the titanium reconstruction of jaw defects in benign conditions in Christian Medical College and Hospital, Vellore. Methods and Material: A retrospective study of titanium reconstruction of mandibular defects due to jaw lesions at Christian Medical College and Hospital, Vellore, India, between May 2008 and May 2011. Results: Mouth opening, facial symmetry, occlusion, chewing ability, plate exposure and patient satisfaction were used as outcome measures. Conclusions: The three-dimensional titanium plate is a reasonable material for immediate mandible reconstruction after surgical resection of benign jaw pathologies. PMID:25210382

Paul, S. Arun; Karthik, A. Kaneesh; Chacko, Rabin; Karunya, Whinny

2014-01-01

221

Mandibular reconstruction using an axially vascularized tissue-engineered construct  

PubMed Central

Background Current reconstructive techniques for continuity defects of the mandible include the use of free flaps, bone grafts, and alloplastic materials. New methods of regenerative medicine designed to restore tissues depend mainly on the so-called extrinsic neovascularization, where the neovascular bed originates from the periphery of the construct. This method is not applicable for large defects in irradiated fields. Methods We are introducing a new animal model for mandibular reconstruction using intrinsic axial vascularization by the Arterio-Venous (AV) loop. In order to test this model, we made cadaveric, mechanical loading, and surgical pilot studies on adult male goats. The cadaveric study aimed at defining the best vascular axis to be used in creating the AV loop in the mandibular region. Mechanical loading studies (3 points bending test) were done to ensure that the mechanical properties of the mandible were significantly affected by the designed defect, and to put a base line for further mechanical testing after bone regeneration. A pilot surgical study was done to ensure smooth operative and post operative procedures. Results The best vascular axis to reconstruct defects in the posterior half of the mandible is the facial artery (average length 32.5 ± 1.9 mm, caliber 2.5 mm), and facial vein (average length 33.3 ± 1.8 mm, caliber 2.6 mm). Defects in the anterior half require an additional venous graft. The defect was shown to be significantly affecting the mechanical properties of the mandible (P value 0.0204). The animal was able to feed on soft diet from the 3rd postoperative day and returned to normal diet within a week. The mandible did not break during the period of follow up (2 months). Conclusions Our model introduces the concept of axial vascularization of mandibular constructs. This model can be used to assess bone regeneration for large bony defects in irradiated fields. This is the first study to introduce the concept of axial vascularization using the AV loop for angiogenesis in the mandibular region. Moreover, this is the first study aiming at axial vascularization of synthetic tissue engineering constructs at the site of the defect without any need for tissue transfer (in contrast to what was done previously in prefabricated flaps). PMID:21418603

2011-01-01

222

Dislocation of the mandibular condyle into the middle cranial fossa.  

PubMed

Dislocation of the mandibular condyle into the middle cranial fossa is an uncommon event. A case report is presented based on a patient (32-year-old female) who sustained a traumatic left condyle fracture with superior dislocation into the middle cranial fossa due to a high-speed car accident. The diagnosis was done four months after trauma. Via a preauricular approach, left condylectomy and transposition of temporal muscle flap was performed. Postoperatively, the patient stayed for two weeks with intermaxillary fixation and four months of physical therapy. PMID:16770205

Clauser, Luigi; Tieghi, Riccardo; Polito, Jessica; Galiè, Manlio

2006-05-01

223

Bilateral bifid mandibular condyles diagnosed with three-dimensional reconstruction  

PubMed Central

Bifid mandibular condyles (BMCs) are rare anomalies. The overwhelming majority of prior reports described their predominantly unilateral occurrence diagnosed by panoramic radiography. We present an even rarer case of bilateral BMC initially identified by panoramic radiography and confirmed with colour-enhanced three-dimensional CT. These images substantiate the theory that the secondary condyles arise from the neck of the mandible (Lopez-Lopez et al. Bifid condyle: review of the literature of the last 10 years and report of two cases. Cianio 2010; 28: 136–140). PMID:22241877

Tanner, JM; Friedlander, AH; Chang, TI

2012-01-01

224

Treatment of Ectopic Mandibular Second Permanent Molar with Elastic Separators  

PubMed Central

Ectopic eruption is a developmental disturbance in which the tooth fails to follow its normal eruption pathway. Ectopic eruption of the second molar is relatively rare. This paper presents the case of thirteen-year-old male with an ectopic mandibular second permanent molar. The condition was corrected with surgical exposure and placement of elastic separators. This case report lays emphasis on the practice of basic methods to obtain acceptable results rather than extensive surgical or orthodontic corrections. It is advised that ectopic teeth should not be neglected especially when it concerns developing caries and malocclusion. PMID:25050182

Rajesh, R.; Naveen, V.; Amit, S.; Baroudi, Kusai; Sampath Reddy, C.; Namineni, Srinivas

2014-01-01

225

Endodontic Treatment of a Mandibular Second Premolar with Type IV Wiene's Root Canal: A Case Report  

PubMed Central

This case report describes an endodontic treatment of a mandibular second premolar with type IV root canal. A 26-year-old male patient reported pain in right mandibular second premolar. Clinical examination showed a large carious lesion with pulp exposure. Radiographs showed minimal periapical changes and slight widening of periodontal ligament space. Mandibular second premolars usually have one canal. The mandibular second premolar may present large number of anatomic variations. The clinician should be aware of the configuration of the pulp system. This case presents the diagnosis and clinical management of a mandibular second premolar with two distinct canals in the apical third of root (Type IV Wiene's canal configuration), drawing particular attention to tactile examination of all the canal walls and obturating it with calamus 3D obturation system. PMID:24711930

Chalil, Noushad Matavan; Kini, Shravan; Jose, Sunil; Narayanan, Arun; Salahudeen, Shahnas; Peedikayil, Faizal C.

2014-01-01

226

Effect of implant-supported prosthesis on the bite force and masticatory efficiency in subjects with shortened dental arches.  

PubMed

The aim of the study was to assess changes in bite force and masticatory efficiency in shortened dental arch (SDA) subjects rehabilitated with implant-supported restoration for 1st molar. Ten SDA subjects with bilaterally missing mandibular molars (experimental group) were recruited. In each subject, one tapered threaded implant was placed bilaterally in 1st mandibular molar region and restored. Masticatory efficiency was evaluated objectively by measuring the released dye from chewed raw carrots, with a 'spectrophotometer' at 530 nm preoperatively and at 3 months after restoration. Bite force was evaluated using 'bite force measuring appliance' preoperatively, at 6 weeks and at 3 months after restoration. Ten completely dentate-matched subjects (in terms of age, sex, height and weight) acted as control. The results revealed that as compared with the control group, the experimental group showed significantly less (P < 0.05) mean maximum bite force at pre-restoration and at 6 weeks after restoration. Although at 3 months the mean maximum bite force value was less than the control group but the mean difference was statistically insignificant. The mean difference of masticatory efficiency between control and experimental group was statistically significant (P < 0.05) before restoration, but was statistically insignificant at 3 months after restoration. Thus it was concluded that after the restoration of mandibular arch with implant-supported prosthesis, both bite force and masticatory efficiency of all SDA subjects increased and were comparable to that of matched completely dentate subjects after 3 months. PMID:24372288

Meena, A; Jain, V; Singh, N; Arora, N; Jha, R

2014-02-01

227

Osseointegrated implant failures.  

PubMed

This article discusses the criteria used for implant success and failure, the classification of implant failures, the causative factors, and diagnosis of the failing and failed implant. In spite of the impressive success rates of osseointegrated dental implants, failures occur and in some studies the incidence of failure is high. Many studies do not use objective criteria to define success and confuse survival with success. The criteria used affect reported success rates. Implant failures may occur early (primary) after implant placement or after the implant is loaded (secondary). There is no single aetiological factor and failures have been attributed to poor surgical technique, host factors that impair healing, poor bone quality, peri-implant infections, poor prosthesis design and traumatic loading conditions. Early diagnosis of problems is critical and every effort should be made to treat the problem while the damage can still be managed or even reversed. PMID:10686922

O'Mahony, A; Spencer, P

1999-01-01

228

Urinary incontinence - injectable implant  

MedlinePLUS

Injectable implants are injections of material into the urethra to help control urine leakage ( urinary incontinence ) caused by a ... into the tissue next to the sphincter. The implant procedure is usually done in the hospital. Or ...

229

A no bleed implant  

Microsoft Academic Search

Breast implants have evolved from the original saline-filled, smooth-surfaced silicone rubber bag to silicone gel-filled smooth-walled sacs to a combination of a silicone gel-filled bag within a saline-filled sac, and, most recently, a reversed, double-lumen implant with a saline bag inside of a gel-filled bag. Texture-surfaced implants were first used in 1970 when the standard silicone gelfilled implant was covered

Robert A. Ersek; Jose Alberto Navarro; Dora Zsofia Nemeth; George Sas

1993-01-01

230

Implantable Heart Aid  

NASA Technical Reports Server (NTRS)

CPI's human-implantable automatic implantable defibrillator (AID) is a heart assist system, derived from NASA's space circuitry technology, that can prevent erratic heart action known as arrhythmias. Implanted AID, consisting of microcomputer power source and two electrodes for sensing heart activity, recognizes onset of ventricular fibrillation (VF) and delivers corrective electrical countershock to restore rhythmic heartbeat.

1984-01-01

231

Functional outcomes following surgical treatment of bilateral mandibular condylar fractures.  

PubMed

Debate continues regarding unilateral or bilateral treatment for mandibular condylar fractures. This retrospective study evaluates the functional outcomes of bilateral condylar process fractures after surgical intervention. From May 1994 to December 2004, 51 adult patients with bilateral mandibular condylar process fractures were studied. There were 33 cases of bilateral condylar fractures (type I); 12 cases of condylar-subcondylar fractures (type II); and six cases of bilateral subcondylar fractures (type III). All patients underwent open reduction and internal fixation. Four patients had chin deviation, six had malocclusion, three had poor chewing function and eight had limited mouth opening. Type I patients had a significantly higher incidence of limited mouth opening (P=0.039) and associated maxillary fractures (n=12) and psychiatric disease (n=6) which yielded significantly poor functional outcomes. Complications included transient facial paresis (n=4), fracture and loosening of postoperative plates (n=3) and surgical wound infections (n=2). Open reduction with rigid fixation for bilateral condylar fractures provided satisfactory functional outcomes in this study. Concomitant maxillary fractures and underlying psychiatric problems are poor outcome factors. Aggressive rehabilitation in the first 9 months is important for early functional recovery. PMID:20961735

Chen, C-T; Feng, C-H; Tsay, P-K; Lai, J-P; Chen, Y-R

2011-01-01

232

Surgical management of mandibular condylar hyperplasia type 1  

PubMed Central

This study compared outcomes of two surgical methods for patients diagnosed with active condylar hyperplasia type 1. Group 1 (n = 12) was treated with orthognathic surgery only, while group 2 (n = 42) was treated with high condylectomies, articular disc repositioning, and orthognathic surgery. There was no statistically significant difference between the two groups for maximum incisal opening, lateral excursions, and subjective jaw function before surgery. Group 2 showed more active presurgical mandibular growth (P < 0.05). At long-term follow up, no differences were found in lateral excursions and subjective jaw function. Group 2 showed a greater increase in maximum incisal opening (P < 0.01) and stability (P < 0.05) at long-term follow-up. All of the patients in group 1 grew back into skeletal and occlusal Class III relationships requiring secondary intervention, whereas all patients in group 2 remained stable in a Class I skeletal and occlusal relationship. Thus, patients with active condylar hyperplasia treated with high condylectomy, articular disc repositioning, and orthognathic surgery had stable, predictable outcomes compared with those treated with orthognathic surgery only. The high condylectomy effectively arrests disproportionate mandibular growth while maintaining normal jaw function. PMID:19865502

Morales-Ryan, Carlos A.; Garcia-Morales, Patricia; Perez, Daniel

2009-01-01

233

Measurements of mandibular length: a comparison of articulare vs condylion.  

PubMed

This study examines the validity of articulare for mandibular length measurements by exposing 3 lateral cephalograms on each of 60 consecutive patients. The radiographs were exposed with the patient in a closed-mouth position in habitual occlusion, a closed-mouth position with the patient in centric relation, and in an open-mouth position. The linear distances (mm) of articulare (Ar) to pogonion (Pog), Ar to gonion (Go), and Go to Pog were measured on the 2 closed-mouth cephalograms and compared with each other as well as the linear distances of condyle (Co) to Pog, Co to Go, and Go to Pog measured from the open-mouth cephalogram on each individual. Product-moment correlation coefficients were used to measure the linear associations among the mandibular measurements from the 3 techniques. Repeated measures analyses of variance were also fit to estimate the correlations between the 3 measurements adjusted for age and sex. The results of this study show that measurements taken from both closed-mouthed techniques agreed extremely well (intraclass correlation coefficient = 0.99). In addition, measurements from both closed-mouth techniques highly agreed with the corresponding measurements taken with the open-mouth technique (intraclass correlation coefficient = 0.94). This data suggests that measurements taken from Ar correlate very well with measurements taken from Co and that this correlation is not dependent on whether the patient is positioned in habitual occlusion or centric relation. PMID:11407774

Haas, D W; Martinez, D F; Eckert, G J; Diers, N R

2001-06-01

234

Mandibular manipulation for the treatment of temporomandibular disorder.  

PubMed

The aim of this study was to conduct a systematic review to identify the randomized clinical studies that had investigated the following research question: Is the mandibular manipulation technique an effective and safe technique for the treatment of the temporomandibular joint disk displacement without reduction? The systematic search was conducted in the electronic databases: PubMed (Medical Publications), LILACS (Latin American and Caribbean Literature in Health Sciences), EMBASE (Excerpta Medica Database), PEDro (Physiotherapy Evidence Database), BBO (Brazilian Library of Odontology), CENTRAL (Library Cochrane), and SciELO (Scientific Electronic Library Online). The abstracts of presentations in physical therapy meetings were manually selected, and the articles of the ones that meet the requirements were investigated. No language restrictions were considered. Only randomized and controlled clinical studies were included. Two studies of medium quality fulfilled all the inclusion criteria. There is no sufficient evidence to support the effectiveness of the mandibular manipulation therapy, and therefore its use remains questionable. Being minimally invasive, this therapy is attractive as an initial approach, especially considering the cost of the alternative approaches. The analysis of the results suggests that additional high-quality randomized clinical trials are necessary on the topic, and they should focus on methods for data randomization and allocation, on clearly defined outcomes, on a priori calculated sample size, and on an adequate follow-up strategy. PMID:23524722

Alves, Betania Mara Franco; Macedo, Cristiane Rufino; Januzzi, Eduardo; Grossmann, Eduardo; Atallah, Álvaro Nagib; Peccin, Stella

2013-03-01

235

An airway study of different maxillary and mandibular sagittal positions.  

PubMed

The aim of this study was to evaluate the oropharyngeal (OP) and nasal passage (NP) volumes along with various airway variables of patients with normal nasorespiratory functions having different dentofacial skeletal patterns and to evaluate the correlations between different variables and the airway. One hundred and one patients (57 males and 44 females, aged 14-18 years) having pre-treatment cone beam computed tomography images and complete medical records were selected. The patients were divided into five groups as Class I (CI, 81 ? SNA ? 77; 80 ? SNB ? 76; 3 ? ANB ? 1), Class II maxillary protrusion (CIIMaxP, SNA > 81; 80 ? SNB ? 76; ANB > 3), Class II mandibular retrusion (CIIMandR, 81 ? SNA ? 77; SNB < 76; ANB > 3), Class III maxillary retrusion (CIIIMaxR, SNA < 77; 80 ? SNB ? 76; ANB < 1), and Class III mandibular protrusion (CIIIMandP, 81 ? SNA ? 77; SNB > 80; ANB < 1). Posterior airway space, area of the most constricted region at the base of the tongue (minAx), and OP volume were significantly higher for the CIIIMandP group, whereas CIIMandR subjects had the lowest values. The only significant difference for the NP volume was between CI and CIIMandR groups where a smaller volume for the CIIMandR group was observed. The minAx was the variable that presented the best correlation with the OP airway volume. It seems that a detailed analysis of airway may prove to be a valuable diagnostic addition in orthodontics. PMID:22045695

El, Hakan; Palomo, Juan Martin

2013-04-01

236

Resorption of fibula bone following mandibular reconstruction for osteoradionecrosis.  

PubMed

The free fibular flap is commonly used for mandibular reconstruction because of its length, consistent blood supply, and relative ease of harvest. The bone has been shown to maintain mass over time, which confers a potential advantage over other osseous flaps. We know of no published papers on changes in height of fibular bone in patients treated for osteoradionecrosis (ORN). We measured the change in bony height over time as an indirect measure of bone mass. We identified 17 patients (mean age 65, range 49-80 years) who had had reconstruction with a free fibular flap for mandibular ORN. Of them, 10 had fixation with a reconstruction plate, and serial radiographs were available for inclusion in the study. Three measurements were taken on at least 2 rotational tomograms for each patient. Two observers recorded measurements at 25, 50, and 75% of the distance along the bone. Mean change in fibular height (mm) and percentage change were calculated. The interval between radiographs ranged from 5 months 4 days to 20 months 14 days. There was a reduction in fibular height in 8/10 cases, with a mean reduction of 1.5mm (range 2.6-0.3), or 11%. Our results show a moderate reduction in fibular height, which is comparable with a previously published series of patients without ORN who had reconstruction with miniplates. The stress shielding effects of reconstruction plates were less evident in our patients than in previously published material. PMID:24613371

Powell, Harry R F; Jaafar, Mustafa; Bisase, Brian; Kerawala, Cyrus J

2014-04-01

237

Primary B-lymphoblastic lymphoma of gallbladder involving mandibular bone.  

PubMed

We report the case of a 75-year-old man who presented for evaluation of painless hematuria persisting for more than 1 month. At the time of presentation, the patient did not report any systemic symptoms and had no fever, weight loss, or dysuria. Computed tomography showed several enhancing, sessile polyps in the gall bladder (1.5 cm or smaller). There was no associated stone or biliary dilation. Since no other abnormality was evident, we performed laparoscopic cholecystectomy. He was diagnosed as having B-cell lymphoblastic lymphoma (B-LBL) after surgical resection of the gall bladder (GB). As the left mandibular swelling was developed after the diagnosis of the B-LBL involving GB, facial magnetic resonance imaging (MRI) was added to the imaging scan. Facial MRI revealed mass formation in the left mandible, left medial pterygoid, masticator, and buccinator muscles. The biopsy samples from the mandibular bone were also diagnosed as B-LBL. The definitive pathological diagnosis was B-LBL, stage IV. Systemic chemotherapy was done with subsequent response in size of the left mandible mass. PMID:24789124

Kim, Hee-Jun; Lee, Tae Jin; Choi, Yoo Shin

2014-06-01

238

Effects of experimentally deviated mandibular position on stress response.  

PubMed

The purpose of this study was to investigate the effects of stress on -prefrontal cortex (PFC), emotion (using visual analogue scale, VAS, and State-Trait Anxiety Inventory, STAI), and the autonomic nervous system (ANS). Two types of stress were applied: (1) malocclusion-induced physical stress and (2) mental stress induced by an arithmetic task. Malocclusion was induced using an experimentally deviated mandibular device (EDMD) to obtain an experimentally deviated mandibular position (EDMP). A total of 11 healthy volunteers participated in the study. On day 1 they performed a pretrial arithmetic task followed by a 10-min rest, after which they performed a posttrial EDMD + arithmetic task or rest device + arithmetic task. These two tasks were selected at random and assigned at the rate of one per day. Activity in the PFC tended to show an increase in the pretrial arithmetic tasks and rest device + arithmetic task, but a decrease in the EDMD + arithmetic task compared with the rest device + arithmetic task. Heart rate significantly increased during the rest device + arithmetic task, whereas no significant difference was observed during the EDMD + arithmetic task. The EDMD + arithmetic task significantly increased STAI scores (p = 0.0047), and the significant decrease in VAS indicated "unpleasant" (p = 0.035). These findings suggest that EDMP-induced reduction in the level of PFC activity was a response to discomfort, indicating that EDMP affects systemic function such as that of the ANS as an unpleasant stressor. PMID:22879007

Amemiya, Ai; Takeda, Tomotaka; Nakajima, Kazunori; Ishigami, Keiichi; Tsujii, Takeo; Sakatani, Kaoru

2013-01-01

239

The retromandibular transparotid approach to mandibular subcondylar fractures.  

PubMed

The aim of this study was to evaluate the safety, utility and morbidity associated with the treatment of mandibular subcondylar fractures using the retromandibular transparotid approach and to evaluate the stability of a single 2mm miniplate fixation system for such fractures. Forty-two cases with 48 mandibular subcondylar fractures were analysed prospectively for 12 months and evaluated for functional results, scar, postoperative complications and stability of fixation. There were three cases of suboptimal occlusal status, two cases of haematoma that were drained and resolved, eight patients with facial nerve weakness which resolved in a few weeks, and three cases of salivary fistulae that resolved after treatment. All cases showed stable osteosyntheses. Maximal postoperative interincisal distance was 32-61 mm (mean 44 mm). Four patients had deflection on opening, while clicking on opening or chewing was observed in five patients. The postoperative scars were well accepted by all patients. The results of this study suggest that a retromandibular approach will facilitate accurate reduction and fixation of subcondylar fragments with a good cosmetic result and minimal complications. A single 2 mm miniplate fixation provides stable results. PMID:22169168

Yang, L; Patil, P M

2012-04-01

240

Restoration of a partially edentulous patient with an implant-supported removable partial denture: a case report.  

PubMed

The aim of this report is to present and discuss the clinical procedure of an implant-supported removable partial denture for a partially edentulous patient who exhibited a severely resorbed ridge and a collapsed vertical stop. The 67-year-old partially edentulous patient presented with a lack of vertical stop and an advanced transverse arch discrepancy. For the maxilla, an implant-supported removable partial denture was fabricated on bilateral distal implant abutments. The mandibular arch was restored with an implant-supported fixed partial denture, since it was expected to function more properly than a removable partial denture. This clinical report demonstrates a successful treatment approach to restore oral function and appearance for the patient. PMID:24459679

Baek, Yeon-Wha; Lim, Young-Jun; Lee, Jong-Ho; Ryu, Hyo-Sook

2014-04-01

241

Rare mandibular surgical ciliated cysts: report of two new cases.  

PubMed

The surgical ciliated cyst, also known as the "postoperative maxillary cyst" or "implantation cyst," occurs as a result of iatrogenic implantation of respiratory epithelium into a noncontiguous surgical site after sinus surgery. It typically presents as a well-defined radiolucency in the maxilla in young adults. Histopathologically, the cyst is lined by ciliated columnar, cuboidal, or pseudostratified squamous epithelium with mucous cells. We report two rare cases of a surgical ciliated cyst located in the mandible. PMID:25109584

Li, Chia-Cheng; Feinerman, David M; MacCarthy, Killian D; Woo, Sook-Bin

2014-09-01

242

Trends in Cochlear Implants  

PubMed Central

More than 60,000 people worldwide use cochlear implants as a means to restore functional hearing. Although individual performance variability is still high, an average implant user can talk on the phone in a quiet environment. Cochlear-implant research has also matured as a field, as evidenced by the exponential growth in both the patient population and scientific publication. The present report examines current issues related to audiologic, clinical, engineering, anatomic, and physiologic aspects of cochlear implants, focusing on their psychophysical, speech, music, and cognitive performance. This report also forecasts clinical and research trends related to presurgical evaluation, fitting protocols, signal processing, and postsurgical rehabilitation in cochlear implants. Finally, a future landscape in amplification is presented that requires a unique, yet complementary, contribution from hearing aids, middle ear implants, and cochlear implants to achieve a total solution to the entire spectrum of hearing loss treatment and management. PMID:15247993

Zeng, Fan-Gang

2004-01-01

243

Anesthetic efficacy of infiltrations in mandibular anterior teeth.  

PubMed Central

The purpose of this prospective, randomized, double-blind study was to measure the degree of anesthesia obtained with a labial infiltration of either 2% lidocaine with 1:50,000 or 2% lidocaine with 1:100,000 epinephrine in mandibular anterior teeth. Another objective was to measure the degree of anesthesia obtained with a lingual infiltration of 2% lidocaine with 1:100,000 epinephrine in mandibular anterior teeth. Through use of a repeated-measures design, 40 subjects randomly received a labial infiltration at the lateral incisor apex of either 1.8 mL of 2% lidocaine with 1:100,000 epinephrine or 1.8 mL of 2% lidocaine with 1:50,000 epinephrine at 2 separate appointments. An additional 40 subjects received a lingual infiltration at the lateral incisor apex of 1.8 mL of 2% lidocaine with 1:100,000 epinephrine. The mandibular anterior teeth were blindly pulp tested at 4-minute cycles for 60 minutes postinjection. No response from the subject to the maximum output (80 reading) of the pulp tester was used as the criterion for pulpal anesthesia. Anesthesia was considered successful when 2 consecutive 80 readings were obtained. For the 3 infiltrations, success rates for the lateral incisor ranged from 43 to 50%. Adjacent teeth had success rates of 27 to 63%. There was no significant difference (P > 0.05) in success between the labial infiltration of 2% lidocaine with 1:100,000 epinephrine and 2% lidocaine with 1:50,000 epinephrine or the lingual infiltration of 2% lidocaine with 1:100,000 epinephrine when compared with the labial infiltration of 2% lidocaine with 1:100,000 epinephrine. Duration of pulpal anesthesia declined steadily for all solutions over the 60 minutes. In conclusion, the success rate of 43-50% and declining duration of pulpal anesthesia over an hour indicates that a labial infiltration of 1.8 mL of either 2% lidocaine with 1:100,000 epinephrine or 1: 50,000 epinephrine or a lingual infiltration of 2% lidocaine with 1:100,000 epinephrine over the lateral incisor apex cannot be recommended clinically to provide profound pulpal anesthesia. PMID:11515948

Yonchak, T.; Reader, A.; Beck, M.; Clark, K.; Meyers, W. J.

2001-01-01

244

[A study of mandibular movement velocity and acceleration in young adults with normal people].  

PubMed

The velocity and acceleration of mandibular movements including the border movement, habitual movement and functional movement were studied in 25 young adults by using D-SGG measuring instrument. The results showed that the conception of functional velocity and the maximum velocity of mandibular movement were developed. The physiological and clinical significance of the value of mandibular movement acceleration can be explained by Newton's Second law, F = ma. The author pointed out that in order to keep the necessary masticatory efficiency, the masticatory velocity enjoy the priority in matching with the masticatory force in mastication. PMID:8194415

Lu, P J

1993-09-01

245

Correlation between mandibular gland secretion and cuticular hydrocarbons in the stingless bee Melipona quadrifasciata.  

PubMed

We investigated whether Melipona quadrifasciata worker mandibular gland secretions contribute directly to their cuticular hydrocarbon profile. The mandibular gland secretion composition and cuticular surface compounds of newly emerged worker bees, nurse bees, and foragers were determined by gas chromatography and mass spectrometry and compared. Both the mandibular gland secretions and the cuticular surface compounds of all worker stages were found to be composed almost exclusively of hydrocarbons. Although the relative proportion of hydrocarbons from the cuticular surface and gland secretion was statistically different, there was a high similarity in the qualitative composition between these structures in all groups of bees. PMID:22576923

Cruz-Landim, C; Ferreira-Caliman, M J; Gracioli-Vitti, L F; Zucchi, R

2012-01-01

246

Fracture-associated osteogenic sarcoma and a mandibular osteoma in two goats.  

PubMed

An osteogenic sarcoma in association with a previously repaired fracture site and an osteoma were recorded in two aged Toggenburg and Toggenburg-cross goats. In one animal, five years after the surgical repair of a comminuted mid-shaft humeral fracture with an intramedullary pin, a sarcoma with osteoid production developed at the fracture site. A review of records revealed the previous occurrence of a mandibular osteoma inducing both subluxation of the temporal mandibular joint and contralateral mandibular deviation in a second animal. Such lesions are rarely documented in goats. PMID:2760277

Steinberg, H; George, C

1989-05-01

247

Endodontic Management of a Mandibular Central Incisor with Type IV Canal Pattern: A Case Report.  

PubMed

The success of endodontic treatment requires the knowledge of tooth morphology and its variations. Mandibular incisor's anatomy presents a challenge when an endodontic access is made, because of its small size and high prevalence of two canals. We are describing a Weine's Type IV root canal configuration that was detected in a mandibular central incisor, which was demonstrated by a radiographic examination. This article also focuses on the successful endodontic treatment of a mandibular central incisor with a single canal at the pulp chamber, which divided into two distinct and separate canals (buccolingual) at the middle third of the root. PMID:24783153

Mittal, Sunandan; Kumar, Tarun; Sharma, Jyotika; Mittal, Shifali; Ahuja, Tarun

2014-03-01

248

Mandibular osteomyelitis due to Pseudomonas aeruginosa. Case report.  

PubMed

Osteomyelitis is a relatively frequent bacterial infection of the jaw bones. This report describes a case of mandibular osteomyelitis in a surgical site after enucleation of a follicular cyst and extraction of the associated tooth. This case is unusual because maxillary osteomyelitis generally results from polymicrobial infection. In our patient, however, laboratory analysis identified Pseudomonas aeruginosa as the etiologic agent, an opportunistic pathogen normally found on moist surfaces and vegetation. Notorious for its antibiotic multiresistance, P. aeruginosa is increasingly recognized as a serious problem in hospitalized patients. Isolation of the responsible microbe permitted specific antibiotic treatment with a 10-day course of ciprofloxacin (250 mg/12 h), which fully cleared the infection. PMID:18617880

Pappalardo, S; Tanteri, L; Brutto, D; Marescalco, M; Carlino, V; Consolo, G; Mauro, M; Cappello, V

2008-06-01

249

Mandibular reconstruction in irradiated patients utilizing myosseous-cutaneous flaps  

SciTech Connect

Myosseous-cutaneous flaps were used for mandibular reconstruction in 16 irradiated patients. Three of six sternomastoid-clavicle flaps failed (all in conjunction with a neck dissection), as did one of 10 pectoralis major-anterior-fifth rib flaps. One trapezius-scapular flap was used and it succeeded. We found the blood supply of the sternomastoid-clavicle flap too tenuous for use in conjunction with a neck dissection. The trapezius-scapular flap had too short an arc of rotation to be used for defects other than those in the horizontal ramus. In addition, this flap required a change of position and created an undesirable functional deformity. The pectoralis major-fifth rib flap, in contrast, could be used for a variety of defects, in conjunction with a neck dissection, and did not require a change of position during operation. We found it to be the most versatile and dependable of the flaps employed in this series.

Pearlman, N.W.; Albin, R.E.; O'Donnell, R.S.

1983-10-01

250

MANDIBULAR ASYMMETRY CHARACTERIZATION USING GENERALIZED TENSOR-BASED MORPHOMETRY  

PubMed Central

Quantitative assessment of facial asymmetry is crucial for successful planning of corrective surgery. We propose a tensor-based morphometry (TBM) framework to locate and quantify asymmetry using 3D CBCT images. To this end, we compute a rigid transformation between the mandible segmentation and its mirror image, which yields global rotation and translation with respect to the cranial base to guide the surgery’s first stage. Next, we nonrigidly register the rigidly aligned images and use TBM methods to locally analyze the deformation field. This yields data on the location, amount and direction of “growth” (or “shrinkage”) between the left and right sides. We visualize this data in a volumetric manner and via scalar and vector maps on the mandibular surface to provide the surgeon with optimal understanding of the patient’s anatomy. We illustrate the feasibility and strength of our technique on 3 representative patients with a wide range of facial asymmetries. PMID:24443671

Paniagua, Beatriz; Alhadidi, Abeer; Cevidanes, Lucia; Styner, Martin; Oguz, Ipek

2012-01-01

251

Anaplastic myeloma presenting as mandibular swelling: Diagnosis by cytology.  

PubMed

Multiple myeloma is a disease resulting from clonal proliferation of plasma cells. A disease of the elderly, jaw lesions are seen in 14% of patients affected with myeloma. Rarely the oral and maxillofacial lesions can be the first manifestation of the disease. We report the case of a 75-year-old man who presented with mandibular swelling. Fine-needle aspiration cytology was done from the swelling and smears were suggestive of anaplastic myeloma, which is a rare and aggressive variant of myeloma. The diagnosis of a plasmacytoma was confirmed by biopsy. Further workup of the patient revealed osteolytic lesions in skull, M band in electrophoresis and evidence of renal failure. Peripheral smear and bone marrow findings were also consistent with myeloma. PMID:25210245

Subitha, K; Renu, Thampy; Lillykutty, Pothen; Letha, V

2014-04-01

252

Severe complication of a bonded mandibular lingual retainer.  

PubMed

Bonding a flexible spiral wire retainer to the lingual surfaces of all 6 anterior mandibular teeth is a commonly used type of retention. Complications are rare but can be serious enough to produce biologic damage. This article presents a serious complication of a lingual flexible spiral wire retainer. Four years after the orthodontic treatment, a 20-year-old man sought treatment for a broken flexible spiral wire retainer. The clinical examination showed about 35° of buccal root torque of that tooth. A cone-beam computed tomography image showed that the root and the apex of the tooth were almost completely out of the bone on its buccal side. Surprisingly, the tooth's vitality was preserved. The tooth was moved back, nearly to its original position; clinically, only a gingival recession remained. Orthodontists and dentists should be aware of possible complications of bonded retainers. Patients should be clearly informed how to detect problems at an early stage. PMID:22920708

Pazera, Pawel; Fudalej, Piotr; Katsaros, Christos

2012-09-01

253

Myoepithelial carcinoma of the retromolar area with extensive mandibular involvement.  

PubMed

Myoepithelial tumors were first described in 1943, and account for less than 1% of all salivary gland neoplasms. Their malignant variant, myoepithelial carcinoma, was first reported by Stromeyer et al. in 1975 and represents a very rare entity, characterized by distinct morphologic heterogeneity and an infiltrative growth pattern into adjacent tissues. However, there have been few reports on myoepithelial carcinoma affecting intra-oral minor salivary glands, and its immunohistochemical features have been poorly illustrated. We herein describe a rare case of myoepithelial carcinoma affecting the retromolar region of a 52-year-old woman that caused extensive mandibular bone destruction. We also reviewed the English literature concerning the involvement of intra-oral minor salivary glands by myoepithelial carcinoma. PMID:23005699

Pontes, Hélder Antônio Rebelo; Pontes, Flávia Sirotheau Corrêa; Toral-Rizo, Victor; de Andrade, Bruno Augusto Benevenuto; Fonseca, Felipe Paiva; de Almeida, Oslei Paes

2012-12-01

254

Focal osteoporotic bone marrow defect mimicking a mandibular cystic lesion.  

PubMed

An unusual presentation of a focal osteoporotic bone marrow defect (FOBMD) of the mandible mimicking a cystic lesion is documented. A definitive diagnosis could be established only on the basis of the histopathologic evaluation. A 66-year-old Brazilian woman was referred by her dentist for well-defined radiolucency of the mandibular molar region suggesting a cystic lesion of odontogenic origin. The computed tomography scan confirmed that the lesion did not affect the corticals. The biopsy confirmed the diagnosis of FOBMD. The diagnostic difficulty in the current case is obvious, because FOBMD, usually exhibiting an ill-defined radiolucency, is seldom suspected preoperatively when a differential diagnosis is considered for focal well-defined radiolucent areas in the jaws. PMID:24978688

Almeida, Luciana Yamamoto; Kato, Rogério Bentes; Ribeiro, Michel Campos; León, Jorge Esquiche

2014-07-01

255

MultiModality Surgical and Hyperbaric Management of Mandibular Osteoradionecrosis  

SciTech Connect

Purpose: To elucidate long-term outcomes in 65 consecutive patients meeting a uniform definition of mandibular osteoradionecrosis (ORN) treated with multimodality therapy including hyperbaric oxygen (HBO). Methods and Materials: Pretreatment, post-treatment and long-term follow-up of mandibular lesions with exposed bone were ranked by a systematic review of medical records and patient telephone calls. The ranking system was based on lesion diameter and number plus disease progression. Changes from pretreatment to post-treatment and follow-up were analyzed by Wilcoxon signed-rank tests. Improved wound survival, measured by time to relapse, defined as any less favorable rank after HBO treatment, was assessed by Kaplan-Meier analysis. Results: In all, 57 cases (88%) resolved or improved by lesion grade or progression and evolution criteria after HBO (p < 0.001). Four patients healed before surgery after HBO alone. Of 57 patients who experienced improvement, 41 had failed previous nonmultimodality therapy for 3 months and 26 for 6 months or more. A total of 43 patients were eligible for time-to-relapse survival analysis. Healing or improvement lasted a mean duration of 86.1 months (95% confidence interval [95% CI], 64.0-108.2) in nonsmokers (n = 20) vs. 15.8 months (95% CI, 8.4-23.2) in smokers (n = 14) versus 24.2 months (95% CI, 15.2-33.2) in patients with recurrent cancer (n = 9) (p = 0.002 by the log-rank method). Conclusions: Multimodality therapy using HBO is effective for ORN when less intensive therapies have failed. Although the healing rate in similarly affected patients not treated with HBO is unknown, the improvements seen with peri-operative HBO were durable provided that the patients remained cancer free and abstained from smoking.

Freiberger, John J., E-mail: freib002@mc.duke.ed [Department of Anesthesiology, Duke University Medical Center, Durham, NC (United States); Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC (United States); Yoo, David S. [Department of Radiation Oncology, Duke University Medical Center, Durham, NC (United States); Lisle Dear, Guy de [Department of Anesthesiology, Duke University Medical Center, Durham, NC (United States); Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC (United States); McGraw, Thomas A. [Department of Oral and Maxillofacial Surgery, Duke University Medical Center, Durham, NC (United States); Blakey, George H. [Department of Radiation Oncology, Duke University Medical Center, Durham, NC (United States); Department of Oral and Maxillofacial Surgery, School of Dentistry, University of North Carolina, Chapel Hill, NC (United States); Padilla Burgos, Rebecca; Kraft, Kevin [Department of Anesthesiology, Duke University Medical Center, Durham, NC (United States); Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC (United States); Nelson, John W. [Department of Radiation Oncology, Duke University Medical Center, Durham, NC (United States); Moon, Richard E. [Department of Anesthesiology, Duke University Medical Center, Durham, NC (United States); Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC (United States); Piantadosi, Claude A. [Department of Anesthesiology, Duke University Medical Center, Durham, NC (United States); Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center, Durham, NC (United States); Department of Medicine, Duke University Medical Center, Durham, NC (United States)

2009-11-01

256

Smoothness of chewing jaw movements in adults with mandibular prognathism.  

PubMed

Indices such as smoothness, movement time, peak velocity, and symmetry of the velocity profile have been shown to be effective in explaining the degree of skilfulness of human saccadic eye, limb, and jaw motions. We investigated whether adult subjects with mandibular prognathism show impaired smoothness of the masticatory jaw movements. Forty-nine adults with skeletal Class III malocclusions and 52 healthy adults with acceptably good occlusions were selected respectively as Test and Control subjects. Subjects of the Test Group were subdivided into two groups: Class III(closed) showed full occlusal contact between the upper and lower teeth at the habitual intercuspal position, whereas Class III(open) showed inability of occlusal contact between the upper and lower anterior teeth. Each subject was asked to chew a piece of chewing gum. The normalised jerk-cost (NJC), movement duration, and tangential velocity profile during jaw-closing movements were compared between groups. Test Groups showed greater NJC (P?mandibular movements made by the Test Groups exhibit lower skilfulness than those made by the Control Group. The jaw movement skilfulness of the prognathic patients decreases most drastically with existence of malocclusal contact between upper and lower anterior teeth. PMID:21923891

Yashiro, K; Takagi, M; Takada, K

2012-02-01

257

Impression techniques for implant dentistry  

Microsoft Academic Search

The object of making an impression in implant dentistry is to accurately relate an analogue of the implant or implant abutment to the other structures in the dental arch. This is affected by use of an impression coping which is attached to the implant or implant abutment. This impression coping is incorporated in an impression – much as a metal

S Jivraj; W Chee

2006-01-01

258

Is self-reported alcohol consumption associated with osteoporotic mandibular bone loss in women?  

PubMed

The aim of this study was to determine whether alcohol consumption would predict mandibular bone quality and quantity in a large European female population. In total, 672 middle-aged and elderly women (45-70 yr of age; standard deviation = 6) were recruited in the study. Alcohol consumption was recorded through a self-reported questionnaire. Mandibular cortical width was measured, by five observers, in the mental foramen region on panoramic radiographs. Mandibular bone density, expressed as aluminium thickness, was recorded on intra-oral radiographs. Alcohol consumption was associated with a reduction of mandibular bone density and cortical width. This association was higher in subjects with excessive alcohol consumption, defined in the present study as > 14 units consumed per week. This study showed reduced jaw-bone quality in older individuals and in those with increased alcohol consumption. PMID:19196312

Nackaerts, Olivia; Horner, Keith; Jacobs, Reinhilde; Karayianni, Kety; Mitsea, Anastasia; Berkas, Leonidas; Mastoris, Michael; Lindh, Christina; van der Stelt, Paul F; Marjanovic, Elizabeth; Adams, Judith E; Pavitt, Susan; Devlin, Hugh

2009-02-01

259

Analysis and design of an adjustable bone plate for mandibular fracture fixation  

E-print Network

This thesis presents the design, analysis and testing of a bone plate for mandibular fracture fixation. Conventional bone plates are commonly used to set fractures of the mandible in a surgical setting. If proper alignment ...

Cervantes, Thomas Michael

2011-01-01

260

Central chondrosarcoma of a pediatric mandibular condyle: A case report and review  

PubMed Central

Chondrosarcoma of mandibular condyle is an extremely rare clinical entity with only 18 cases reported till date. We report a rare case of central myxoid chondrosarcoma in a 7 year old male child with a complaint of slow growing bony hard swelling of left mandibular condyle. Panoramic radiography and CT scan revealed a 5×3cm osteosclerotic and osteolytic lesion with cortical perforation on the medial side of the left mandibular condyle with a cortical expansion of lateral side. Segmental mandibulectomy with disarticulation of the left condyle was done. To the best of our knowledge it is the first case of chondrosarcoma of the paediatric mandibular condyle to be reported. The etiopathogenesis, clinical, radiological diagnosis and various treatment modalities of chondrosarcoma are discussed PMID:24987606

Kumar Reddy, D. Sathya; Kishore Kumar, R. V.; Gali, Rajasekhar; Kannubaddy, Sridhar Reddy; Rao, Mallikarjuna; Akheel, Mohammad

2014-01-01

261

Alveolar ridge expansion-assisted orthodontic space closure in the mandibular posterior region  

PubMed Central

Orthodontic closure of old, edentulous spaces in the mandibular posterior region is a major challenge. In this report, we describe a method of orthodontic closure of edentulous spaces in the mandibular posterior region accelerated by piezoelectric decortication and alveolar ridge expansion. Combined piezosurgical and orthodontic treatments were used to close 14- and 15-mm-wide spaces in the mandibular left and right posterior areas, respectively, of a female patient, aged 18 years and 9 months, diagnosed with skeletal Class III malocclusion, hypodontia, and polydiastemas. After the piezoelectric decortication, segmental and full-arch mechanics were applied in the orthodontic phase. Despite some extent of root resorption and anchorage loss, the edentulous spaces were closed, and adequate function and esthetics were regained without further restorative treatment. Alveolar ridge expansion-assisted orthodontic space closure seems to be an effective and relatively less-invasive treatment alternative for edentulous spaces in the mandibular posterior region. PMID:24396740

Akdeniz, Berat Serdar; Sumer, Mahmut

2013-01-01

262

Impact of pelleted diets with different mineral compositions on the crown size of mandibular cheek teeth and mandibular relative density in degus (Octodon degus).  

PubMed

The impact of pelleted diets with different mineral compositions on the crown size of the mandibular cheek teeth, as well as the mandibular bone and cheek teeth density, in degus (Octodon degus) was investigated. A total of 28 animals were randomly divided into four groups and fed different calcium or phosphorous dietary content, in the presence or absence of UV light, for 14 months. Dental radiographs and CT images of the head were taken, and the crown size of premolar and molar teeth was recorded. Apical and coronal crown elongation of all cheek teeth and significantly smaller relative cheek teeth and mandibular densities were recorded in degus fed a high-phosphorus diet with an improper calcium:phosphorus ratio. A diet with a calcium:phosphorus ratio of 1:1 was also responsible for the rapid development of dental disease with subsequent severe health impairment. PMID:21672952

Jekl, V; Gumpenberger, M; Jeklova, E; Hauptman, K; Stehlik, L; Knotek, Z

2011-06-18

263

Morphometric analysis of the Korean mandibular ramus for distraction osteogenesis using micro-computed tomography.  

PubMed

When performing distraction osteogenesis, the osteotomy is normally applied to the cortical bone posterior to the mandibular second molar. We measured the topographic thickness of the cortical and trabecular bone of the mandibular ramus and at the mandibular canal (MC) to provide crucial anatomic data aimed at minimizing complications and elucidating the most appropriate site for placing the distractor. Forty sides of the mandibles were prepared from 20 Korean cadavers (10 men and 10 women with a mean age of 68 years). The specimens were scanned and reconstructed into three-dimensional images using a micro-computed tomography system. Coronal and horizontal sectional images of the mandibular ramus were taken at thickness intervals of 2 mm from the reconstructed three-dimensional images. Image analysis software was used to measure the thicknesses of the cortical and trabecular bone and to identify the locations of the MC within the body and the mandibular ramus on each section. The mean thicknesses of the buccal cortical plate, trabecular bone, and lingual cortical plate were 2.9 mm (men, 3.0 mm; women, 2.8 mm), 9.1 mm (men, 9.8 mm; women, 8.5 mm), and 2.2 mm (men, 2.3 mm; women, 2.1 mm), respectively. The distance from the buccal surface of the mandible to the MC increased from 5.3 to 10.0 mm (men, 5.3-10.0 mm; women, 5.3-9.1 mm) when moving progressively anterosuperior from the mandibular angle region. Morphometric analyses of the mandibular ramus can provide crucial data when performing mandibular osteotomy and locating an appropriate placement site for a distractor device during the distraction-osteogenesis procedure. PMID:21239925

Lee, Jae-Gi; Kim, Il-Soo; Kim, Young-Woo; Park, Jong-Tae; Hu, Kyung-Seok; Kim, Hyung-Gon; Kim, Hee-Jin

2011-01-01

264

Patterns of growth of the mandibular corpus in spotted hyenas ( Crocuta crocuta ) and cougars ( Puma concolor )  

Microsoft Academic Search

Differences in jaw morphology among adult carnivorans are well established, but the ontogenetic mechanisms by which these differences arise are largely unexplored. Mandibular ontogeny inCrocuta crocutaandPuma concoloris analysed biomechanically using principles of beam theory. In each species, the development of cross-sectional properties of the mandibular corpus associated with rigidity under loading follows a biphasic pattern of growth. In early postnatal

AUDRONE R. BIKNEVICIUS; STEVEN R. LEIGH

1997-01-01

265

Utility of high density porous polyethylene implants in maxillofacial surgery.  

PubMed

The aim of this paper was to determine the utility of high density porous polyethylene implants (HDPE) in a variety of facial skeletal deformities. Sixteen patients (age range 14-28 years) with facial deformities requiring skeletal defect reconstruction or augmentation, treated between January 2008 and December 2010. The follow-up of the patients ranged from 6 months to 2 years.The types of deformities and defects treated include: one patient each with hemifacial microsomia and nasal tip correction, two patients each with malar deformities and orbital floor reconstruction, three patients with paranasal deformities and mandibular hypoplasia and four patients with chin augmentation. A total of 24 implants were placed. The complications included infection and wound dehiscence in one patient. The implants were palpable extraorally in two patients. It is concluded that HDPE is an excellent alternative to autogenous grafts for facial skeletal augmentation. Its porous nature, excellent soft tissue growth and coverage are the advantages and disadvantages include its rigidity and sometimes it is palpable extraorally. PMID:24644395

Rai, Anshul; Datarkar, Abhay; Arora, Aakash; Adwani, D G

2014-03-01

266

Pivot technique combined with mandibular backward distraction osteogenesis for the patient with high risk for relapse.  

PubMed

Severe skeletal relapse is one of the most difficult problems after mandibular advancement, and the management to overcome such problems tends to require more compromised methods and longer treatment period. We described that mandibular backward distraction osteogenesis with maxillomandibular fixation at an appropriate occlusion. Furthermore, to avoid inappropriate distraction vector, the distal plates of the distraction device were fixed with 1 screw to work as a pivot after the manipulation of the condyle to the glenoid fossa at the end of distraction activation. This technique was applied to 3 female patients with mandibular deficiency. The intraoral distractors were set on the lateral surface of the mandibular body; the fixation of the distal plate was fixed with 1 monocortical screw to make the proximal segment including the condyle manipulating at the end of the distraction phase by releasing the maxillomandibular fixation. The distraction rate was 1 mm/d, and the latency period was 7 days. The follow-up period after mandibular backward distraction osteogenesis ranged from 26 to 56 months. No specific complication, such as broken device, severe infection, or bony nonunion, occurred. Postoperative relapse was not observed during the follow-up period. This technique might become 1 choice to apply for mandibular deficiency in a patient with high risk for relapse. PMID:22565870

Yamauchi, Kensuke; Takahashi, Tetsu; Kaneuji, Takeshi; Nogami, Shinnosuke; Miyamoto, Ikuya; Lethaus, Bernd

2012-05-01

267

Effects of bite-jumping appliances on mandibular advancement in growing rats: A radiographic study  

PubMed Central

Objective: The aim was to evaluate the effects of the use of mandibular advancement appliances on mandibular growth in growing rats. Materials and Methods: Twenty-four 8-week-old male Wistar albino rats were randomly divided into two experimental groups (12 rats each): Group I was a control group, and Group II was the mandibular advancement appliance group. A functional bite-jumping appliance was used in Group II to promote mandibular advancement. Anatomical changes in the condyle and mandible were evaluated by comparing radiographic results from before and after the study, with angular and linear measurements. Friedman and Mann-Whitney U-tests were used in statistical analysis. Results: According to the radiographic results, the growth of mandibles and condyles in Group II was significantly greater than with the length of the condylar process (A-B) and distance from condyle to menton (A-D) variables (P < 0.05). In addition, Group I showed greater mandibular base growth than did Group II (P < 0.05). Conclusions: We conclude that the use of an intraoral bite-jumping appliance can stimulate condylar growth and increase sagittal mandibular advancement in growing rats.

Oksayan, Ridvan; Sokucu, Oral; Ucuncu, Neslihan

2014-01-01

268

Orthodontic treatment for a mandibular prognathic girl of short stature under growth hormone therapy.  

PubMed

This report presents a case of a 12-year-old girl with maxillary deficiency, mandibular prognathism, and facial asymmetry, undergoing growth hormone (GH) therapy due to idiopathic short stature. Children of short stature with or without GH deficiency have a deviating craniofacial morphology with overall smaller dimensions; facial retrognathism, especially mandibular retrognathism; and increased facial convexity. However, a complete opposite craniofacial pattern was presented in our case of a skeletal Class III girl with idiopathic short stature. The orthodontic treatment goal was to inhibit or change the direction of mandibular growth and stimulate the maxillary growth of the girl during a course of GH therapy. Maxillary protraction and mandibular retraction were achieved using occipitomental anchorage (OMA) orthopedic appliance in the first stage of treatment. In the second stage, the patient was treated with a fixed orthodontic appliance using a modified multiple-loop edgewise archwire technique of asymmetric mechanics and an active retainer of vertical chin-cup. The treatment led to an acceptable facial profile and obvious facial asymmetry improvement. Class I dental occlusion and coincident dental midline were also achieved. A 3½-year follow-up of the girl at age 18 showed a stable result of the orthodontic and dentofacial orthopedic treatment. Our case shows that the OMA orthopedic appliance of maxillary protraction combined with mandibular retraction is effective for correcting skeletal Class III malocclusion with midface deficiency and mandibular prognathism in growing children with idiopathic short stature undergoing GH therapy. PMID:24331110

Pan, Chin-Yun; Lan, Ting-Hung; Chou, Szu-Ting; Tseng, Yu-Chuan; Chang, Jenny Zwei-Chieng; Chang, Hong-Po

2013-12-01

269

Who Is an Implant Candidate?  

MedlinePLUS

Who Is an Implant Candidate? If you're interested in replacing a missing tooth or teeth, dental implants may be an option for you. Most people are good candidates for implants. A good candidate should have the following: Healthy ...

270

Smoking and dental implants  

PubMed Central

Smoking is a prevalent behaviour in the population. The aim of this review is to bring to light the effects of smoking on dental implants. These facts will assist dental professionals when implants are planned in tobacco users. A search of “PubMed” was made with the key words “dental implant,” “nicotine,” “smoking,” “tobacco,” and “osseointegration.” Also, publications on tobacco control by the Government of India were considered. For review, only those articles published from 1988 onward in English language were selected. Smoking has its influence on general as well as oral health of an individual. Tobacco negatively affects the outcome of almost all therapeutic procedures performed in the oral cavity. The failure rate of implant osseointegration is considerably higher among smokers, and maintenance of oral hygiene around the implants and the risk of peri-implantitis are adversely affected by smoking. To increase implant survival in smokers, various protocols have been recommended. Although osseointegrated dental implants have become the state of the art for tooth replacement, they are not without limitations or complications. In this litigious era, it is extremely important that the practitioner clearly understands and is able and willing to convey the spectrum of possible complications and their frequency to the patients. PMID:24478965

Kasat, V.; Ladda, R.

2012-01-01

271

Comparison of the position of the mandibular fossa using 3D CBCT in different skeletal frames in human caucasic skulls  

Microsoft Academic Search

Summary  INTRODUCTION: The mandibular fossa (MF) connects the mandible to the cranium through a bilateral articulation. It is suggested\\u000a that the mandible and the temporal bones have a reciprocal effect on their position and movement, acting as a temporo-mandibular\\u000a unit. The purpose of this study was to analyze the possible role of the mandibular fossa in the development of malocclusion\\u000a by

C. Basili; H. N. Costa; K. Sasaguri; S. Akimoto; R. Slavicek; S. Sato

2009-01-01

272

Considerations of mandibular angle fractures during and after surgery for removal of third molars: a review of the literature  

Microsoft Academic Search

Background  Angle fractures are quite common considering that the angle of the mandible forms an area of lower resistance which contains\\u000a a thicker upper border, a thin basilar bone, and the presence of an impacted mandibular third molar. Common complications\\u000a of mandibular third molar surgery include alveolar osteitis (dry socket), secondary infection, nerve dysfunction, and hemorrhage.\\u000a Reports of mandibular fracture during

Bruno Ramos Chrcanovic; Antônio Luís Neto Custódio

2010-01-01

273

Cochlear implants in children.  

PubMed

In recent years, the House single-electrode cochlear implant has proven to be a clinically feasible prosthesis for profoundly deaf adults. Based on these findings, the decision was made to begin implanting those children who could not benefit from hearing aids. As of August 1982, 23 profoundly deaf children (ranging in age from 3.4 to 17.5 yrs) have received the cochlear implant. The majority were deafened by meningitis. Results to date indicate that children demonstrate sound field thresholds and receive timing/intensity information comparable to that of adult implant patients. Results have been extremely encouraging, but only long-term experience will determine the ultimate benefit of the implant in children. PMID:6687579

Eisenberg, L S; Berliner, K I; Thielemeir, M A; Kirk, K I; Tiber, N

1983-01-01

274

Use of Forsus fatigue-resistant device in a patient with Class I malocclusion and mandibular incisor agenesis.  

PubMed

Orthodontic treatment in patients with congenitally missing teeth can be challenging. In this case report, we describe the treatment of a 15-year-old girl with mild dental crowding and 2 congenitally missing mandibular incisors. The Forsus fatigue-resistant device was used to move the mandible and the mandibular teeth forward. A new balanced and stable occlusion was achieved after treatment. When the treatment plan includes moving the mandibular teeth forward in a patient with mandibular incisor agenesis, the profile and the skeletal and dental features should be carefully scrutinized to ensure that balanced and esthetic results are achieved. PMID:24880853

Zhang, Ruofang; Bai, Yuxing; Li, Song

2014-06-01

275

Implant over implant: An alternative method for solving malpositioned osseointegrated implants at the sinus floor.  

PubMed

An implant was malpositioned and osseointegrated at the maxillary sinus floor with no complications. However, unexpected bone formation over the implant made the implant nonfunctional. Because the patient rejected the removal of the implant, it was left in place while another short implant was placed into the newly formed bone in approximately the same position as the old implant to restore the posterior maxillary tooth. Within 6 months, the new implant over the old asymptomatic implant was functional. Radiographs revealed osseointegration and stable periimplant marginal bone level with no signs of infection or inflammation. PMID:24819533

Man, Yi; Wang, Tianlu; Mo, Anchun; Qu, Yili

2014-10-01

276

A comparative study of incisor procumbency and mandibular morphology in vampire bats.  

PubMed

The three species of vampire bats (Phyllostomidae: Desmodontinae), Desmodus rotundus, Diaemus youngi, and Diphylla ecaudata, are the only mammals that obtain all nutrition from vertebrate blood (sanguinivory). Because of the unique challenges of this dietary niche, vampire bats possess a suite of behavioral, physiological, and morphological specializations. Morphological specializations include a dentition characterized by small, bladelike, non-occlusive cheek teeth, large canines, and extremely large, procumbent, sickle-shaped upper central incisors. The tips of these incisors rest in cuplike pits in the mandible behind the lower incisors (mandibular pits). Here, we use microCT scanning and high-resolution radiography to describe the morphology of the mandible and anterior dentition in vampire bats, focusing on the relationship between symphyseal fusion, mandibular pit size, incisor size, and procumbency. In Desmodus and Diaemus, highly procumbent upper incisors are associated with relatively small mandibular pits, an unfused mandibular symphysis with substantial bony interdigitations linking the dentaries, and a diastema between the lower central incisors that helps to facilitate the lapping of blood from a wound. In Diphylla, less procumbent upper incisors are associated with relatively large mandibular pits, a completely fused mandibular symphysis, and a continuous lower toothrow lacking a central diastema. We hypothesize that symphyseal morphology and the presence or absence of the diastema are associated with the angle of upper incisor procumbency and mandibular pit development, and that spatial constraints influence the morphology of the symphysis. Finally, this morphological variation suggests that Diphylla utilizes a different feeding strategy as compared to Desmodus and Diaemus, possibly resulting from the functional demands of specialization on avian, rather than mammalian, blood. PMID:20544874

Davis, Jillian S; Nicolay, Christopher W; Williams, Susan H

2010-07-01

277

Peri-implant mucositis and peri-implantitis: bacterial infection.  

PubMed

Osseointegrated dental implants have a ong-term success rate of over 90%, but may be threatened by peri-implant mucostis and peri-implantitis, bacteria biofilm-induced inflammatory conditions. While peri-implant mucositis is a reversible inflammatory condition confined to the peri-implant soft-tissue unit, peri-implantitis is characterised by progressive inflammatory destruction of the crest of the alveolar bone supporting the implant, by increased peri-implant probing depths, and by bleeding and/or suppuration on probing. Effective treatment of peri-implant mucositis will prevent the development of peri-implantitis. Plaque accumulation on the implant/abutment surface juxtaposed to the junctional epithelium and to the connective tissue zone of the peri-implant soft-tissue unit induces the development of peri-implant mucositis which can subsequently progress to peri-implantitis. The aim of this paper is to review some aspects of bacterial infection of the tissue supporting dental implants, and to explore how to maintain the healthy peri-implant soft-tissue unit. PMID:23189895

Khammissa, R A G; Feller, L; Meyerov, R; Lemmer, J

2012-03-01

278

Effects of hypodontia on craniofacial structures and mandibular growth pattern  

PubMed Central

Introduction This study was performed to examine craniofacial structures in persons with hypodontia and to reveal any differences, that may occur, when agenetic teeth are only found in the maxilla, the mandible or in both jaws. The groups consistent of 50 children (33 girls, 17 boys) aged between 9 and 13.5 years were analyzed and assigned to three subgroups. Group 1 = upper jaw hypodontia. Group 2 = lower jaw hypodontia. Group 3 = hypodontia in both jaws. Materials and methods Eleven angular and three index measurements from lateral encephalographs and two linear measurements from dental blaster casts were calculated. All data was statistically analyzed, parameters with p < 5% were investigated for each subgroup respectively. Results In comparison with standards the study group showed bimaxillary retrognathism and a reduction of the lower anterior facial height. Moreover both overbite and overjet significantly increased. Other values laid within the normal ranges. Evaluating results of the subgroups, differences in the means of SNA, SNB and overjet between the groups were observed. Analysis of the mandibular growth pattern revealed, that neither vertical nor horizontal patterns are dominant in hypodontia patients. Conclusions In certain dentofacial parameters differences between persons with hypodontia and such with full dentition exist. According to our findings agenetic teeth may have a negative influence on the saggital development of a jaw and the lower face and may be responsible for increased overbites. This should receive attention in orthodontic treatment of hypodontia patients. PMID:22142280

2011-01-01

279

Effects of Edentulism on Mandibular Morphology: Evaluation of Panoramic Radiographs  

PubMed Central

Purpose. The objective of this study was to evaluate morphological changes of the mandible in edentulous and dentate subjects using panoramic radiographs. Materials and Methods. Panoramic radiographs were divided into the following three groups: Group I (completely edentulous group), Group II (old dentate group) and Group III (young dentate group). The research parameters of gonial angle, condylar height, ramus height, ramus notch depth, and antegonial notch depth were measured on panoramic radiographs. The Kruskal-Wallis statistical test was used to determine significant differences in mandibular morphological parameters among the three groups. The Mann-Whitney U test was used to compare the subgroups. Results. Significant differences were found only in ramus height between three groups. According to the Mann-Whitney U test, a significant difference was exhibited among Groups I and II in the ramus height parameter. No significant differences were found in the gonial angle, condylar height, ramus notch depth, or antegonial notch depth when comparing the young dentate, old dentate, and completely edentulous subjects. Conclusions. Significant differences were found only in ramus height between the groups. Ramus height may be an indicator that changed by years and tooth loss. It must be considered that ramus height can be decreased in edentulism. PMID:25202718

Oksayan, R?dvan; Asarkaya, Bayram; Palta, Nizamettin; Simsek, Irfan; Sokucu, Oral; Isman, Eren

2014-01-01

280

Sleep apnea and mandibular advancement device. Revision of the literature.  

PubMed

Sleep apnea and hypopnea syndrome (SAHS) is a disorder characterized by intermittent and repetitive obstruction of the upper airway provoking pharyngeal collapse. It is characterized clinically by a triad of daytime hypersomnia, snoring and pauses in breathing during sleep that are normally reported by the partner. Polysomnography is the chosen method for diagnosing this pathology. Patients with this disorder tend to have the following dental and orofacial signs: a retrognathic jaw, a narrow palate, a wide neck, deviation of the nasal septum and relative macroglossia, among others. Dentists should be ready to evaluate the risk-benefit of certain dental treatment options for this public health problem. The treatment of this problem will depend on its severity, with one of the options being the Mandibular Advancement Device (MAD) that is used especially in the treatment of slight or moderate SAHS and in the treatment of snoring, with results that are occasionally very successful. The objective of this study is to carry out an up-to-date literature review of SAHS and to evaluate the role of the dentist when faced with this pathology. PMID:18758397

Rodríguez-Lozano, Fco Javier; Sáez-Yuguero, Maria del Rosario; Linares Tovar, Eva; Bermejo Fenoll, Ambrosio

2008-09-01

281

Dental Implant Systems  

PubMed Central

Among various dental materials and their successful applications, a dental implant is a good example of the integrated system of science and technology involved in multiple disciplines including surface chemistry and physics, biomechanics, from macro-scale to nano-scale manufacturing technologies and surface engineering. As many other dental materials and devices, there are crucial requirements taken upon on dental implants systems, since surface of dental implants is directly in contact with vital hard/soft tissue and is subjected to chemical as well as mechanical bio-environments. Such requirements should, at least, include biological compatibility, mechanical compatibility, and morphological compatibility to surrounding vital tissues. In this review, based on carefully selected about 500 published articles, these requirements plus MRI compatibility are firstly reviewed, followed by surface texturing methods in details. Normally dental implants are placed to lost tooth/teeth location(s) in adult patients whose skeleton and bony growth have already completed. However, there are some controversial issues for placing dental implants in growing patients. This point has been, in most of dental articles, overlooked. This review, therefore, throws a deliberate sight on this point. Concluding this review, we are proposing a novel implant system that integrates materials science and up-dated surface technology to improve dental implant systems exhibiting bio- and mechano-functionalities. PMID:20480036

Oshida, Yoshiki; Tuna, Elif B.; Aktoren, Oya; Gencay, Koray

2010-01-01

282

[Implantable ventricular assist device].  

PubMed

Implantable ventricular assist device( VAD) is the only evidence-based option to treat stage D heart failure patients with significant symptoms at rest in spite of maximum medical therapy, other than heart transplant. Implantable VADs available in Japan include Evaheart, DuraHeart both from Japan, Jarvik 2000 and HeartMate II both from United States. In Japanese settings, implantable VAD is indicated and insured only for patients who are supposed to have an indication for receiving heart transplant, which means "bridge to transplantation" use. And in Japan, implantable VAD can be implanted for patients less than 65 years old if it needs to be insured. In the University of Tokyo Hospital, the mid-term outcomes of 41 implantable VAD patients were acceptable with 2 hospital deaths, 2 remote deaths and oneyear survival rate at 88%.Considering the present Japanese situation with extreme shortage of organ donation, the extended application of implantable VADs as "Destination Therapy" is awaited, but quality of life of care-givers as well as patients themselves and sustainable follow-up system provided by healthcare professionals need to be warranted. PMID:25138935

Nawata, Kan; Kinoshita, Osamu; Kimura, Mitsutoshi; Ono, Minoru

2014-07-01

283

Transcatheter aortic valve implantation  

PubMed Central

Transcatheter aortic valve implantation was developed to offer a therapeutic solution to patients with severe symptomatic aortic stenosis who are not candidates for conventional aortic valve replacement. The improvement in transcatheter aortic valve implantation outcomes is still of concern in the areas of stroke, vascular injury, heart block, paravalvular regurgitation and valve durability. Concomitantly, the progress, both technical and in terms of material advances of transcatheter valve systems, as well as in patient selection, renders transcatheter aortic valve implantation an increasingly viable treatment for more and more patients with structural heart disease. PMID:25374670

Oliemy, Ahmed

2014-01-01

284

Association between mandibular posterior alveolar morphology and growth pattern in a Chinese population with normal occlusion*  

PubMed Central

Objective: To investigate the relationship between growth patterns and mandibular posterior tooth-alveolar bone complex morphology in a Chinese population with normal occlusion. Methods: Forty-five patients with normal occlusion (23 males, 22 females) were included in this study. Among these patients, 20 displayed the vertical growth pattern, and 20 had the horizontal growth pattern, while the remaining patients displayed the average growth pattern. All of the patients underwent dental cone beam computed tomography (CBCT), which included the region of the mandibular posterior teeth and the alveolar. A linear regression analysis and a correlation analysis between the facial height index (FHI) and the alveolar bone morphology were performed. Results: The inclination of the molars, the thickness of the cortical bone, and the height of the mandibular bone differed significantly between patients with the horizontal growth pattern and those with the vertical growth pattern (P<0.05). Significant positive correlations were found between: the FHI and the inclination of the molars; the FHI and the thickness of the cortical bone; and the FHI and the height of the mandibular bone. Conclusions: The mandibular posterior tooth-alveolar bone complex morphology may be affected by growth patterns. PMID:23303628

Han, Min; Wang, Rong-yang; Liu, Hong; Zhu, Xiu-juan; Wei, Fu-lan; Lv, Tao; Wang, Na-na; Hu, Li-hua; Li, Guo-ju; Liu, Dong-xu; Wang, Chun-ling

2013-01-01

285

Excess genistein suppresses the synthesis of extracellular matrix in female rat mandibular condylar cartilage  

PubMed Central

Aim: To investigate the effect of excess genistein on the extracellular matrix in mandibular condylar cartilage of female rats in vivo. Methods: Female SD rats were administered through oral gavage with genistein (50 mg/kg) or placebo daily for 6 weeks. The morphological changes of temporomandibular joints were studied with HE staining. The expression of cartilage matrix compounds (aggrecan and collagen type II), estrogen-related molecules (aromatase, estradiol, ER? and ER?) and proliferating cell nuclear antigen (PCNA) in mandibular condylar cartilage was detected using immunohistochemistry, ELISA and real-time PCR. Results: The genistein treatment significantly reduced the thickness of the posterior and middle regions of mandibular condylar cartilage, and decreased the expression of collagen type II, aggrecan and PCNA. Compared with the control group, the estradiol content and expression levels of the key estradiol-synthesizing enzyme aromatase in the genistein-treatment group were significantly decreased. The genistein treatment significantly increased the expression of ER?, but decreased the expression of ER?. Conclusion: Excess genistein suppresses extracellular matrix synthesis and chondrocytes proliferation, resulting in thinner mandibular condylar cartilage. These effects may be detrimental to the ability of mandibular condylar cartilage to adapt to mechanical loads. PMID:22705728

Yu, Shi-bin; Xing, Xiang-hui; Dong, Guang-ying; Weng, Xi-li; Wang, Mei-qing

2012-01-01

286

Effects of early unilateral mandibular first molar extraction on condylar and ramal vertical asymmetry  

PubMed Central

Objective: The objective of the following study is to investigate the mandibular vertical asymmetry in a group of patients with early unilateral mandibular first molar extractions. Materials and Methods: Mandibular asymmetry index measurements (condylar, ramal and condylar-plus-ramal) were performed on the panoramic radiographs of a study group including 51 patients (mean age: 18.60 ± 1.11 years) and a control group of 51 patients (mean age: 18.53 ± 1.29 years). Group I included patients with a unilateral mandibular first molar extracted before the age of 12 years. Group II included patients with no extractions and had excellent Class I relationships, no missing teeth and slight or moderate anterior crowding. A paired t-test was used to determine possible statistically significant differences between the sides for the measurements. Student's t-test was used for the comparison of asymmetry index values between the groups and genders. Results: No group showed statistically significant sex-or side-specific differences for posterior vertical height measurements. Condylar asymmetry index and ramal asymmetry index measurements were not statistically different between the groups, while condylar-plus-ramal asymmetry index (CRAI) measurements were statistically different between the groups (P = 0.019). Conclusions: A slight difference for CRAI value was found in patients with early unilateral mandibular first molar extractions. PMID:24966767

Halicioglu, Koray; Celikoglu, Mevlut; Buyuk, Suleyman K.; Sekerci, Ahmet E.; Candirli, Celal

2014-01-01

287

Displacement of dental implants into the focal osteoporotic bone marrow defect: a report of three cases.  

PubMed

Focal osteoporotic bone marrow defect (FOBMD) is a radiolucent area corresponding to the presence of hematopoietic tissue rarely found in the jaws. FOBMD is most commonly located in the mandibular edentulous posterior area of a middle-aged female. From November 2011 to November 2012, we experienced three cases involving removal of implants that had accidentally fallen into the FOBMD area. All patients happened to be female, with a mean age of 54 years (range: 51-60 years). One case involved hypoesthesia of the lower lip and chin, while two cases healed without any complication. Displacement of an implant into the FOBMD area is an unusual event, which occurs rarely during placement of a dental fixture. The purpose of this study was to report on three cases of FOBMD and to provide a review of related literature. PMID:24471025

Lee, Sang-Chil; Jeong, Chang-Hwa; Im, Ho-Yong; Kim, Seong-Young; Ryu, Jae-Young; Yeom, Hak-Yeol; Kim, Hyeon-Min

2013-04-01

288

Endoprosthetic reconstructive surgery with medical grade long term implantable silicone in facial asymmetry  

PubMed Central

The authors present their experience over a period of 13 years (1998-2011) regarding a cohort of 54 patients. In an extensive loss of tissues resulted from congenital malformations (maxillary and mandibular malformations, micro stoma), collagenosis (scleroderma, Romberg Syndrome), traffic and work accidents, post surgical (cancer and facial nerve paralyze), when usual surgical procedures fail to establish the normal look of the patient medical grade long-term implantable silicone endoprosthetic reconstruction (rehabilitation) intervenes. Using a specific technique and materials like long-term implantable silicone grade, the resulted endoprostheses replace and create the aesthetic and a normal anatomy of the specified region, very well tolerated, elastic and non-allergic and with a perfect acceptation from the body all the life. PMID:23346254

Latcan, E; Popescu, CR

2012-01-01

289

[Dental implants and their materials].  

PubMed

Some new trends in materials for dental implants, which also effect in the operative techniques and implant design, are described. Advantages and shortcomings of the different material types are exemplified and correlated with their bioinert resp. bioactive functions. The practical interest in metallic implants focussed in titanium resp. oxide ceramics in the ceramic field, whereas the special goal of implant research follows from the improvement of the bioactive principle with loaded calcium phosphate implants. PMID:6350895

Newesely, H

1983-07-01

290

Ion implantation at elevated temperatures  

SciTech Connect

A kinetic model has been developed to investigate the synergistic effects of radiation-enhanced diffusion, radiation-induced segregation and preferential sputtering on the spatial redistribution of implanted solutes during implantation at elevated temperatures. Sample calculations were performed for Al and Si ions implanted into Ni. With the present model, the influence of various implantation parameters on the evolution of implant concentration profiles could be examined in detail.

Lam, N.Q.; Leaf, G.K.

1985-11-01

291

Implantable Medical Devices  

MedlinePLUS

... A left ventricular assist device (LVAD) is a battery-operated, mechanical pump-type device that's surgically implanted. ... of the body and attached to the pump's battery and control system. LVADs are now portable and ...

292

Implant-Supported Denture  

MedlinePLUS

... or 6 (denture needed to be made) Standard abutments connected to the tops of the implants Once ... material will secure the denture to the healing abutments. About two weeks after the second procedure, the ...

293

Cochlear Implants (For Parents)  

MedlinePLUS

Sometimes called a "bionic ear," the cochlear implant offers the hope of regaining or restoring the ability to sense sound for some people ... does may help kids better understand their new bionic ear and the cool technology behind it that ...

294

Assessing the mobility of the mandibular condyle by sonography  

PubMed Central

Purpose Traditionally, the measurement of the maximal mouth opening was regarded as the mobility of the temporomandibular joint. The information, however, was not reliable. Sonography was often used to diagnose disc displacement in the temporomandibular joint and its validity was well established. The tool was also appropriate for measuring the outcome of temporomandibular disorders management. Therefore, the purpose of the study was to examine completely the reliability and error for evaluating the mobility of the mandibular condyle by sonography. In addition, the existing methods were modified to improve the repeatability. Patients and methods The reliability examinations included between-image and within-image explorations to represent the reliabilities of the image capturing and the mobility measuring, respectively. Sixty-two subjects were recruited to receive ultrasonic examination for condylar mobility. The images of the condyle in mouth closing and opening were captured and the horizontal displacement of the condyles was measured as the anterior translation of the condyle. To confirm that the probe did not move during mouth opening, a marker was placed between the skin and the ultrasonic probe as the landmark. Results The results demonstrated that the intrarater and interrater reliabilities in the within-image test were 0.986 and 0.970 and the reliabilities in the between-image test were 0.904 and 0.857, respectively. The standard errors of measurement in the within-image and between-image tests were 0.04 cm and 0.09 cm, respectively. Conclusion Sonography is a reliable tool to assess condylar mobility and can be used to measure the treatment outcome for temporomandibular disorders. PMID:25342888

Chen, Han-Yu; Wu, Shyi-Kuen; Lu, Chuan-Chin; You, Jia-Yuan; Lai, Chung-Liang

2014-01-01

295

[Larynx: implants and stents].  

PubMed

There is a wide variety of devices and materials to be implanted into the human larynx. Some are intended to remain only for a period of time, like laryngeal stents. If removal is not intended the device meets the definition for a medical implant. The majority of implants is used for the treatment of unilateral vocal fold immobility. There a 2 types of implants serving this purpose: Implants in a stricter sense are devices of solid material, which are brought into the paraglottic space through a window in the laryngeal framework (medialization thyroplasty). Several different products are presented in this review. In contrast, there are different substances available for endoscopic injection into the paralyzed vocal fold (injection laryngoplasty). Since some of these substances show a corpuscular consistency and a high viscosity they need to be deposited into the lateral paraglottic space. Therefore, the term "injectable implants" has been coined for these materials. The different substances available are discussed in detail in this review. Laryngeal stents are primarily used in the early postoperative phase after open reconstruction of the larynx. The different devices available on the market are described with their specific characteristics and intended use. PMID:19353452

Sittel, C

2009-05-01

296

THE EFFECT OF PHENYLEPHRINE ON EXCRETION OF FLUID AND ELECTROLYTES BY THE PAROTID AND MANDIBULAR GLANDS OF THE RAT  

Microsoft Academic Search

The effect has been investigated of the ?-adrenergic agonist, phenylephrine, on excretion of water and electrolytes (Na, K, and HCO3) by the parotid and mandibular glands of the rat. In the mandibular glands the agonist was as effective as acetylcholine (or parasympathetic nerve stimulation) in stimulating secretion, and the electrolyte excretory patterns seen in the two modes of stimulation were

JA Young; DI Cook; G Jones; J McGirr; C Thompson

1979-01-01

297

Mandibular glands of stingless bees (Hymenoptera: Apidae): Chemical analysis of their contents and biological function in two species of Melipona  

Microsoft Academic Search

Workers ofMelipona fasciata andM. interrupta triplaridis respond to their respective mandibular gland extracts with alarm recruitment and defensive behavior. Workers rapidly exit from the nest entrance, land on an intruding object, and bite with the mandibles while vibrating the flight muscles. These behaviors are accompanied by the release of the contents of the mandibular glands. Colonies of both species exhibited

B. H. Smith; D. W. Roubik

1983-01-01

298

ORIGINAL RESEARCH A Potential Pitfall of MR Imaging for Assessing Mandibular Invasion of Squamous Cell Carcinoma in the Oral Cavity  

Microsoft Academic Search

RESULTS: Twenty-five of 51 patients had histopathologic evidence of mandibular cortical invasion. The tumor involved both the cortex and the bone marrow in all 25 patients and involved the inferior alveolar canal in 5 patients. The sensitivity and specificity for mandibular cortical invasion were 96% and 54% for MR imaging and 100% and 88% for CT, respectively. Those for inferior

A. Imaizumi; N. Yoshino; I. Yamada; K. Nagumo; T. Amagasa; K. Omura; N. Okada; T. Kurabayashi

299

Brodie bite with an extracted mandibular first molar in a young adult: a case report.  

PubMed

Total buccal crossbites are rare, but, when they occur, they can be extremely difficult to correct, even with surgery and orthodontics. In most patients with in-locking crossbites, the maxillary teeth erupt past their mandibular antagonists, creating severe occlusal difficulties. This article presents an adult patient with scissors-bite or partial telescoping bite bilaterally in the posterior region and an extracted mandibular first molar on the right side. She was treated with expansion of the mandibular arch, and the subsequent open bite was closed with the help of masticatory muscle exercises and high-pull headgear. The second and third molars were uprighted and moved mesially to close the extraction spaces. PMID:20451791

Chugh, Vinay K; Sharma, Vijay P; Tandon, Pradeep; Singh, Gyan P

2010-05-01

300

Inferior alveolar nerve injuries associated with mandibular fractures at risk: a two-center retrospective study.  

PubMed

The aim of the study was to investigate the incidence of the inferior alveolar nerve (IAN) injury in mandibular fractures. This study is based on two databases that have continuously recorded patients hospitalized with maxillofacial fractures in two departments-Department of Maxillofacial Surgery, Vrije Universiteit University Medical Center, Amsterdam, the Netherlands, and Division of Maxillofacial Surgery, San Giovanni Battista Hospital, Turin, Italy. Demographic, anatomic, and etiology variables were considered for each patient and statistically assessed in relation to the neurosensory IAN impairment. Statistically significant associations were found between IAN injury and fracture displacement (p?=?0.03), isolated mandibular fractures (p?=?0.01), and angle fractures (p?=?0.004). A statistically significant association was also found between IAN injury and assaults (p?=?0.03). Displaced isolated mandibular angle fractures could be considered at risk for increased incidence of IAN injury. Assaults seem to be the most important etiological factor that is responsible for IAN lesions. PMID:25383147

Boffano, Paolo; Roccia, Fabio; Gallesio, Cesare; Karagozoglu, K; Forouzanfar, Tymour

2014-12-01

301

Asymmetry in mesial root number and morphology in mandibular second molars: a case report.  

PubMed

Ambiguity in the root morphology of the mandibular second molars is quite common. The most common root canal configuration is 2 roots and 3 canals, nonetheless other possibilities may still exist. The presence of accessory roots is an interesting example of anatomic root variation. While the presence of radix entomolaris or radix paramolaris is regarded as a typical clinical finding of a three-rooted mandibular second permanent molar, the occurrence of an additional mesial root is rather uncommon and represents a possibility of deviation from the regular norms. This case report describes successful endodontic management of a three-rooted mandibular second molar presenting with an unusual accessory mesial root, which was identified with the aid of multiangled radiographs and cone-beam computed tomography imaging. This article also discusses the prevalence, etiology, morphological variations, clinical approach to diagnosis, and significance of supernumerary roots in contemporary clinical dentistry. PMID:24516829

Nayak, Gurudutt; Shetty, Shashit; Shekhar, Rhitu

2014-02-01

302

Changes in the radiographic characteristics of the mandibular alveolar process in dentate women with varying bone mineral density: A 5-year prospective study  

Microsoft Academic Search

The association between skeletal bone mineral density (BMD) and mandibular alveolar bone mass has been reported to be rather weak, probably due to local functional factors. Many new investigations are therefore focused on assessing the mandibular bone structure. No long-term structural alterations have been reported in human mandibular bone with the exception of alveolar crest changes related to periodontal disease.

Grethe Jonasson; Lisa Jonasson; Stavros Kiliaridis

2006-01-01

303

Functional and morphological correlates of mandibular symphyseal form in a living human sample.  

PubMed

Variation in recent human mandibular form is often thought to reflect differences in masticatory behavior associated with variation in food preparation and subsistence strategies. Nevertheless, while mandibular variation in some human comparisons appear to reflect differences in functional loading, other comparisons indicate that this relationship is not universal. This suggests that morphological variation in the mandible is influenced by other factors that may obscure the effects of loading on mandibular form. It is likely that highly strained mandibular regions, including the corpus, are influenced by well-established patterns of lower facial skeletal integration. As such, it is unclear to what degree mandibular form reflects localized stresses incurred during mastication vs. a larger set of correlated features that may influence bone distribution patterns. In this study, we examine the relationship between mandibular symphyseal bone distribution (i.e., second moments of area, cortical bone area) and masticatory force production (i.e., in vivo maximal bite force magnitude and estimated symphyseal bending forces) along with lower facial shape variation in a sample of n?=?20 living human male subjects. Our results indicate that while some aspects of symphyseal form (e.g., wishboning resistance) are significantly correlated with estimates of symphyseal bending force magnitude, others (i.e., vertical bending resistance) are more closely tied to variation in lower facial shape. This suggests that while the symphysis reflects variation in some variables related to functional loading, the complex and multifactorial influences on symphyseal form underscores the importance of exercising caution when inferring function from the mandible especially in narrow taxonomic comparisons. PMID:24264260

Holton, Nathan E; Franciscus, Robert G; Ravosa, Matthew J; Southard, Thomas E

2014-03-01

304

Risk Factors and Dose-Effect Relationship for Mandibular Osteoradionecrosis in Oral and Oropharyngeal Cancer Patients  

SciTech Connect

Purpose: To analyze risk factors and the dose-effect relationship for osteoradionecrosis (ORN) of the mandible after radiotherapy of oral and oropharyngeal cancers. Materials and Methods: One-hundred ninety-eight patients with oral (45%) and oropharyngeal cancer (55%) who had received external radiotherapy between 1990 and 2000 were retrospectively reviewed. All patients had a dental evaluation before radiotherapy. The median radiation dose was 60 Gy (range, 16-75 Gy), and the median biologically effective dose for late effects (BED{sub late}) in bone was 114 Gy{sub 2} (range, 30-167 Gy{sub 2}). Results: The frequency of ORN was 13 patients (6.6%). Among patients with mandibular surgery, eight had ORN at the surgical site. Among patients without mandibular surgery, five patients had ORN on the molar area of the mandible. The median time to ORN was 22 months (range, 1-69 months). Univariate analysis revealed that mandibular surgery and Co-60 were significant risk factors for ORN (p = 0.01 and 0.04, respectively). In multivariate analysis, mandibular surgery was the most important factor (p = 0.001). High radiation doses over BED 102.6 Gy{sub 2} (conventional dose of 54 Gy at 1.8 Gy/fraction) were also a significant factor for ORN (p = 0.008) and showed a positive dose-effect relationship in logistic regression (p = 0.04) for patients who had undergone mandibular surgery. Conclusions: Mandibular surgery was the most significant risk factor for ORN of mandible in oral and oropharyngeal cancers patients. A BED of 102.6 Gy{sub 2} or higher to the mandible also significantly increases the risk of ORN.

Lee, Ik Jae; Koom, Woong Sub [Department of Radiation Oncology, Yonsei University College of Medicine, Seoul (Korea, Republic of); Lee, Chang Geol, E-mail: cglee1023@yuhs.a [Department of Radiation Oncology, Yonsei University College of Medicine, Seoul (Korea, Republic of); Kim, Yong Bae; Yoo, Sei Whan; Keum, Ki Chang; Kim, Gwi Eon [Department of Radiation Oncology, Yonsei University College of Medicine, Seoul (Korea, Republic of); Choi, Eun Chang [Department of Otolaryngology, Yonsei University College of Medicine, Seoul (Korea, Republic of); Cha, In Ho [Department of Oral and Maxillofacial Surgery, Yonsei University College of Dentistry, Seoul (Korea, Republic of)

2009-11-15

305

[Dental implant-related infections].  

PubMed

Dental implant-associated infections are expected to be increasingly more common as the number of patients with implants for more than 10 years rises. There are 2 stages of peri-implant infection: early mucositis, consisting of inflammation of the peri-implant soft tissues without loss of supporting bone, and a more advanced form involving a loss of osseointegration, known as peri-implantitis. The estimated prevalence of this latter infection is 10% of 5-year implants and the main risk factor is previous periodontal disease. The etiopathogenesis of peri-implantitis is related with reservoirs of periodontal pathogens; however factors that lead to colonization of the implant surface or increased susceptibility to infection may also have an influence. Treatment should include removal of the bacterial biofilm, debridement of the exposed surface, and surgical regeneration of the peri-implant pocket. PMID:19100180

López-Cerero, Lorena

2008-11-01

306

Talon Cusps in Mandibular Incisors: An Unusual Presentation in a Child Patient  

PubMed Central

Talon cusp is a dental anomaly also known as an eagle’s talon. It is an extra cusp on an anterior tooth which arises as a result of evagination on the surface of a crown before calcification has occurred. The exact etiology is unknown. The inci-dence of talon cusp is less than 6%. Commonly involved teeth are maxillary incisors, usually unilateral but in some instanc-es bilateral. The classical radiographical feature of talon cusp is double teeth appearance. The anomaly has been reported to be unusual in the mandibular dentition. This article reports an unusual case of talon cusp of permanent mandibular central incisors. PMID:23019506

Kumar Rao, Prasanna; Ram Shetty, Shishir; V. Prabhu, Rachana; Veena, K.M.; Chatra, Laxmikanth; Shenai, Prashanth

2011-01-01

307

Case report: impression and maxillo-mandibular relationship recording for construction of obturator prostheses.  

PubMed

The present case report describes a procedure for obtaining the master impression and the maxillo-mandibular relationship for the definitive prosthesis in a maxillectomy patient. After casting the metal framework, a visible-light-cured tray resin was spread over the resin retention grid and gradually cured. Modelling compound was extended over the resin with functional movements, and finally the margins of the defect were sealed with a dental impression wax. A column of light-cured resin was constructed from the lower face of the resin/compound/wax structure to the opposing dental arch. This column permitted recording of the maxillo-mandibular relationship. PMID:11695135

Dominguez, L da S; Rilo Pousa, B; Fernandez Varela, J; Martinez Insua, A

2001-03-01

308

[Secondary repair of oro-pharyngectomy with mandibular resection and radionecrosis].  

PubMed

There are two pitfalls to be avoided in transmandibular buccopharyngectomy: mandibular amputation and inversely a contemplative wait-and-see attitude. Preservative measures require a precise evaluation of bone invasion, surgical approaches respecting the lip and cutaneo-muscular flaps, and an early assessment of the secondary effects of radiotherapy. Reasonable use of bone periosteal free flaps and striving for immediate reconstruction of each defect certainly leads to an interventionist behavior, but which can be conducted under better conditions and more attainable objectives than after mandibular deformation, a pharyngostomia or recent radionecrosis. Microsurgical procedures are nothing more than technical mastery and can lead to arrogant behavior. Fifty cases illustrate this position. PMID:9697232

Devauchelle, B; Testelin, S; Bonan, C; Souaid, G

1998-07-01

309

Transosseous fixation of pediatric displaced mandibular fractures with polyglactin resorbable suture--a simplified technique.  

PubMed

Management of pediatric mandibular fractures presents a unique challenge to surgeons in terms of its numerous variations compared to adults. Both conservative and open methods have been advocated with their obvious limitations and complications. However, conservative modalities may not be possible in grossly displaced fractures, which necessitate the open method of fixation. We present a novel and simplified technique of transosseous fixation of displaced pediatric mandibular fractures with polyglactin resorbable suture, which provides adequate stability without any interference with tooth buds and which is easy to master. PMID:24220403

Chandan, Sanjay; Halli, Rajshekhar; Joshi, Samir; Chhabaria, Gaurav; Setiya, Sneha

2013-11-01

310

Hominid mandibular corpus shape variation and its utility for recognizing species diversity within fossil Homo  

PubMed Central

Mandibular corpora are well represented in the hominin fossil record, yet few studies have rigorously assessed the utility of mandibular corpus morphology for species recognition, particularly with respect to the linear dimensions that are most commonly available. In this study, we explored the extent to which commonly preserved mandibular corpus morphology can be used to: (i) discriminate among extant hominid taxa and (ii) support species designations among fossil specimens assigned to the genus Homo. In the first part of the study, discriminant analysis was used to test for significant differences in mandibular corpus shape at different taxonomic levels (genus, species and subspecies) among extant hominid taxa (i.e. Homo, Pan, Gorilla, Pongo). In the second part of the study, we examined shape variation among fossil mandibles assigned to Homo(including H. habilis sensu stricto, H. rudolfensis, early African H. erectus/H. ergaster, late African H. erectus, Asian H. erectus, H. heidelbergensis, H. neanderthalensis and H. sapiens). A novel randomization procedure designed for small samples (and using group ‘distinctness values’) was used to determine whether shape variation among the fossils is consistent with conventional taxonomy (or alternatively, whether a priori taxonomic groupings are completely random with respect to mandibular morphology). The randomization of ‘distinctness values’ was also used on the extant samples to assess the ability of the test to recognize known taxa. The discriminant analysis results demonstrated that, even for a relatively modest set of traditional mandibular corpus measurements, we can detect significant differences among extant hominids at the genus and species levels, and, in some cases, also at the subspecies level. Although the randomization of ‘distinctness values’ test is more conservative than discriminant analysis (based on comparisons with extant specimens), we were able to detect at least four distinct groups among the fossil specimens (i.e. H. sapiens, H. heidelbergensis, Asian H. erectus and a combined ‘African Homo’ group consisting of H. habilis sensu stricto, H. rudolfensis, early African H. erectus/H. ergaster and late African H. erectus). These four groups appear to be distinct at a level similar to, or greater than, that of modern hominid species. In addition, the mandibular corpora of H. neanderthalensis could be distinguished from those of ‘African Homo’, although not from those of H. sapiens, H. heidelbergensis, or the Asian H. erectus group. The results suggest that the features most commonly preserved on the hominin mandibular corpus have some taxonomic utility, although they are unlikely to be useful in generating a reliable alpha taxonomy for early African members of the genus Homo. PMID:19094183

Lague, Michael R; Collard, Nicole J; Richmond, Brian G; Wood, Bernard A

2008-01-01

311

Immediate reconstruction of mandibular defects with a composite sternocleidomastoid musculoclavicular graft  

SciTech Connect

The problem of mandibular reconstruction has been approached using many surgical techniques. This article studies one such approach--reconstruction using full-thickness clavicle pedicled on the sternocleidomastoid muscle. Five patients with stage II and stage III carcinoma of the anterior part of the floor of the mouth were treated with mandibular resection and neck dissection. The resulting defects were immediately reconstructed with the clavicle-sternocleidomastoid muscle technique. The patients were observed from one to three years and were examined postoperatively with technetium Tc 99m medronate scans, which demonstrated the grafts to be viable. The technique proved reliable in a limited clinical trial.

Barnes, D.R.; Ossoff, R.H.; Pecaro, B.; Sisson, G.A.

1981-01-01

312

Gender Categorization in Cochlear Implant Users  

E-print Network

information in speech and intense speech therapy following implantation are probably responsible the dissociation between recovery of speech recognition and voice feature perception after cochlear implantation, cochlear implants, gender, speech perception A cochlear implant (CI) is an effective neuroprosthe- sis

313

History of cochlear implantation.  

PubMed

The evolution of cochlear implantation from early experimentation with electrical stimulation of the ear in the 18th century to the sophisticated multichannel device that we now routinely implant has been remarkable. It is a tribute to the perseverance of a number of dedicated scientists in many disciplines who, in the face of serious, but ultimately unfounded, theoretical objections and ethical challenges, were eventually able to restore useful hearing to that large group of profoundly deaf adults and children, who were hitherto untreatable. The transformation in the lives of prelingually deaf children, who are now able to acquire speech and language and fulfil their full educational potential has been particularly spectacular. Cochlear implantation is the greatest advance in the field of otolaryngology in the last hundred years, and in medicine in general is one of the landmark achievements of the 20th century. PMID:24533753

Ramsden, Richard T

2013-11-01

314

Current trends in dental implants  

PubMed Central

Tooth loss is very a very common problem; therefore, the use of dental implants is also a common practice. Although research on dental implant designs, materials and techniques has increased in the past few years and is expected to expand in the future, there is still a lot of work involved in the use of better biomaterials, implant design, surface modification and functionalization of surfaces to improve the long-term outcomes of the treatment. This paper provides a brief history and evolution of dental implants. It also describes the types of implants that have been developed, and the parameters that are presently used in the design of dental implants. Finally, it describes the trends that are employed to improve dental implant surfaces, and current technologies used for the analysis and design of the implants. PMID:24868501

Gaviria, Laura; Salcido, John Paul; Guda, Teja

2014-01-01

315

Unilateral Molariform Macrodont Mandibular Second Premolar: An Unusual Case Report in A Nonsyndromic Patient  

PubMed Central

Macrodontia is a rare dental anomaly that refers to teeth appears larger than normal. It can be generalized or isolated macrodontia. Isolated macrodontia involving premolar is very rare. This case report presents an unusual unilateral molarifrom macrodontia of mandibular second premolar. PMID:25177648

Chaurasia, Vishwajit Rampratap; Masamatti, Vinay Kumar; Tiwari, Samarth; Malik, Sidharath

2014-01-01

316

Bone marrow edema of the mandibular condyle related to internal derangement, osteoarthrosis, and joint effusion  

Microsoft Academic Search

Purpose: The purpose of this prospective study was to evaluate whether common magnetic resonance imaging (MRI) variables such as temporomandibular joint (TMJ) internal derangement, osteoarthrosis, and effusion may predict the diagnostic group of bone marrow edema of the mandibular condyle. Materials and Methods: The relationship between bone marrow edema and TMJ disc displacement, osteoarthrosis, and effusion was analyzed in MRIs

Iris Brandlmaier; Christoph Schmid; Stefan Bertram; Ansgar Rudisch

2003-01-01

317

Total subapical mandibular osteotomy to correct class 2 division 1 dento-facial deformity  

Microsoft Academic Search

A severe Class 2 division 1 dento-facial deformity in an adult is normally treated by a combination of orthodontics and orthognathic surgery. The surgical procedure may involve either a single or double jaw osteotomy. The sagittal split osteotomy with forward mandibular slide has been the procedure of choice for many years for correcting the antero-posterior discrepancy between the dental arches.

Theophilus Boye; Peter Doyle; Fiona McKeown; Jonathan Sandler

318

Computer Simulation Surgery for Mandibular Reconstruction Using a Fibular Osteotomy Guide  

PubMed Central

In the present study, a fibular osteotomy guide based on a computer simulation was applied to a patient who had undergone mandibular segmental ostectomy due to oncological complications. This patient was a 68-year-old woman who presented to our department with a biopsy-proven squamous cell carcinoma on her left gingival area. This lesion had destroyed the cortical bony structure, and the patient showed attenuation of her soft tissue along the inferior alveolar nerve, indicating perineural spread of the tumor. Prior to surgery, a three-dimensional computed tomography scan of the facial and fibular bones was performed. We then created a virtual computer simulation of the mandibular segmental defect through which we segmented the fibular to reconstruct the proper angulation in the original mandible. Approximately 2-cm segments were created on the basis of this simulation and applied to the virtually simulated mandibular segmental defect. Thus, we obtained a virtual model of the ideal mandibular reconstruction for this patient with a fibular free flap. We could then use this computer simulation for the subsequent surgery and minimize the bony gaps between the multiple fibular bony segments.

Jeong, Woo Shik; Choi, Seung Ho

2014-01-01

319

Assessment of plate use for mandibular reconstruction: Has changing technology made a difference?  

Microsoft Academic Search

Reconstruction of mandibular defects with a variety of alloplastic materials during a 22-year period was reviewed. Outcomes were examined to determine whether specific plating technology affected the incidence of plate-related complications including plate exposure, plate fracture, and plate removal. Repair with the miniplate, reconstruction plate, titanium hollow screw reconstruction plate, and locking reconstruction plate was evaluated. Although the incidence of

DOUGLAS W. KLOTCH; THOMAS J. GAL; ROBIN L. GAL

1999-01-01

320

Intraosseous Epidermoid Cyst Associated with Impacted Mandibular Wisdom Teeth: An Uncommon Entity  

PubMed Central

Epidermoid and dermoid cysts of the jaws are seen rarely. The formation theories of the intraosseous epidermoid cyst (IEC) are not clear. The radiographic appearance is similar with unilocular cysts. Surgical enucleation is the suggested treatment method for epidermoid cysts. This case report presents bilateral mandibular intraosseous epidermoid cysts with impacted wisdom teeth which is the first documented case in the literature. PMID:25177657

Akkas, Ismail; Tek, Mustafa; Ozan, Fatih; Boran, Cetin

2014-01-01

321

Design and fabrication of reconstructive mandibular models using fused deposition modeling  

Microsoft Academic Search

Purpose – Combination of advanced imaging, designing and manufacturing techniques has been rapidly developed in recent years for diagnostic and therapeutic purposes for medical devices. The purpose of this paper is to present a methodology for design and fabrication procedure of medical models using computer-aided design (CAD) and fused deposition modeling (FDM) technique for application in the mandibular reconstructive surgery.

Esfandyar Kouhi; Syed Masood; Yos Morsi

2008-01-01

322

Surgical Removal of Fractured Endodontic Instrument in the Periapex of Mandibular First Molar  

PubMed Central

The purpose of this article is to present the surgical removal of a broken endodontic file from the periapical region of the distal root of a mandibular first molar. The methods of diagnosis and measurement of the distance of the instrument to the adjacent vital structures in the periapical region was done with simple means and in an economical manner.

Gandevivala, Adil; Parekh, Bandish; Poplai, Gaurav; Sayed, Aliya

2014-01-01

323

Afferent and Efferent Aspects of Mandibular Sensorimotor Control in Adults Who Stutter  

ERIC Educational Resources Information Center

Purpose: Individuals who stutter show sensorimotor deficiencies in speech and nonspeech movements. For the mandibular system, the authors dissociated the sense of kinesthesia from the efferent control component to examine whether kinesthetic integrity itself is compromised in stuttering or whether deficiencies occur only when generating motor…

Daliri, Ayoub; Prokopenko, Roman A.; Max, Ludo

2013-01-01

324

ForPeerReview A novel statistical model for mandibular helical axis analysis  

E-print Network

Reich2 , Ralph DeLong3 , Seung-Pyo Lee4 , Itaru Mizoguchi1 1 Department of Orthodontics and Dentofacial-modeling regression, mandibular movement Correspondence: Kazuo Hayashi, D.D.S., Ph.D. Department of Orthodontics received orthodontic treatment. Maximum mouth-opening was measured by means of an opto-electronic motion

Reich, Brian J.

325

Computer Aided Surgery Virtual 3D Planning and Guidance of Mandibular  

E-print Network

Salisbury2 , Sabine Girod1 1 Division of Plastic Surgery and 2 Department of Computer Science StanfordComputer Aided Surgery Virtual 3D Planning and Guidance of Mandibular Distraction Osteogenesis planning, craniofacial surgery, distraction osteogenesis 1. INTRODUCTION 1.1 Distraction Osteogenesis

Salisbury, Kenneth

326

Mandibular Bone and Soft Tissues Necrosis Caused by an Arsenical Endodontic Preparation Treated with Piezoelectric Device  

PubMed Central

This paper describes a case of wide mandibular bone necrosis associated with significant soft tissues injury after using an arsenical endodontic preparation in the right lower second molar for endodontic purpose. Authors debate about the hazardous effects of the arsenic paste and the usefulness of piezosurgery for treatment of this drug related bone necrosis. PMID:24062957

Giudice, A.; Cristofaro, M. G.; Barca, I.; Novembre, D.; Giudice, M.

2013-01-01

327

Leaf-cutting ant faecal fluid and mandibular gland secretion: effects on microfungi spore germination.  

PubMed

The mandibular gland secretion (MGS) and the faecal fluid (FF) of the leaf-cutting ant Atta sexdens rubropilosa Forel affected the spore germination of selected microfungi isolated from nests of this insect. MGS was more effective than the FF, completely inhibiting the spore germination of four out of six microfungi species. PMID:24031181

Rodrigues, André; Carletti, Carla D; Bueno, Odair C; Pagnocca, Fernando C

2008-01-01

328

Bilateral fusion of mandibular second molars with supernumerary teeth: case report  

Microsoft Academic Search

Fusion is a developmental anomaly characterized by the union of two adjacent teeth. In this article we report a rare case of bilateral fusion of permanent mandibular second molars with supernumerary teeth. The rarity with which this entity appears, along with its complex characteristics, often make it difficult to treat. The endodontic management of one tooth is described, as well

Eduardo Nunes; Ivaldo Gomes de Moraes; Paulo Márcio de Oliveira Novaes; Simone Maria Galvão de Sousa

2002-01-01

329

Reconstruction of Mandibular Defect by Free Re-Vascularized Fibula Graft: A Case Report  

Microsoft Academic Search

Background: In maxillofacial surgery tumor ablation often causes continuity defect of mandible which results anatomical and functional morbidity of the patient. The reconstruction of the mandibular defect is mandatory to restore the oral function and speech. Various methods of immediate reconstruction are implemented by different authors time to time including autogenous non vascularized bone graft, allogenic bone graft , auto

Quazi Billur Rahman; Mahmudur Rahman; Showkat Mamun; Munjur Iqbal; Binay Kumar Das

2009-01-01

330

Treatment outcomes with mandibular removable partial dentures: A population-based study of patient satisfaction  

Microsoft Academic Search

Statement of problem. Little is known about the outcomes of treatment with mandibular removable partial dentures provided by dentists in private dental practice.Purpose. This study examined 15 aspects of patient satisfaction and explored the factors found to be associated with dissatisfaction.Material and methods. A questionnaire was mailed to people whose dental insurance claims included CPT Code 5214 within the last

Richard P. Frank; Peter Milgrom; Brian G. Leroux; Natalie R. Hawkins

1998-01-01

331

Use of conservative condylectomy for treatment of osteochondroma of the mandibular condyle  

Microsoft Academic Search

Purpose: The aim of the present study was to present a conservative condylectomy technique (condylectomy performed below the condylar head but high in the condylar neck) and articular disc repositioning as the surgical treatment approach for management of osteochondroma of the head of the mandibular condyle. Patients and Methods: Six patients (4 females and 2 males) with an average age

Larry M. Wolford; Pushkar Mehra; Pedro Franco

2002-01-01

332

Feeding habits of Plio-Pleistocene large carnivores as revealed by the mandibular geometry  

Microsoft Academic Search

Extant large members of the order Carnivora show high variability in feeding adaptation. Morphology of their teeth and skull is a primer to predict diet in both extant and extinct species. Here I present a complete geometric morphometric survey of mandible of large (>7 kg) Carnivora in order to make paleoecological predictions for selected Plio-Pleistocene taxa. Mandibular size and shape

Carlo Meloro

2011-01-01

333

Transformation in mandibular imaging with sweep imaging with fourier transform magnetic resonance imaging  

PubMed Central

Objective Current imaging techniques are often sub-optimal for the detection of mandibular invasion by squamous cell carcinoma. The aim of this study was to determine the feasibility of a magnetic resonance imaging (MRI) based technique known as Sweep Imaging with Fourier Transform (SWIFT) to visualize the structural changes of intra-mandibular anatomy during invasion. Design Descriptive case study Setting Tertiary academic institution Method Two specimens from patients with oral carcinoma who underwent segmental mandibulectomy were imaged using a 9.4 Tesla Varian MRI system. The SWIFT images were correlated with histological sections. Results The SWIFT technique with in vitro specimens produced images with sufficient resolution (156–273) and contrast to allow accurate depiction of tumor invasion of cortical and medullary bone. Both specimens had histopathological evidence of mandibular invasion with tumor. A high degree of correlation was found between MR images and histopathologic findings. Conclusion SWIFT MRI offers three-dimensional assessment of cortical and medullary bone in fine detail with excellent qualitative agreement with histopathology. MR imaging with the SWIFT technique demonstrates great potential to identify mandibular invasion by oral carcinoma. PMID:21930980

Kendi, Ayse Tuba Karagulle; Khariwala, Samir S.; Zhang, Jinjin; Idiyatullin, Djaudat S.; Corum, Curtis A.; Michaeli, Shalom; Pambuccian, Stefan E.; Garwood, Michael; Yueh, Bevan

2012-01-01

334

Dislocation of temporo-mandibular joint - an uncommon circumstance of occurrence: vaginal delivery.  

PubMed

Dislocation of temporo-mandibular joint (TMJ) is an infrequent disease but still spectacular. This disease consists of a permanent, to some extent complete disruption of the temporo-mandibular joint. These dislocations often occur in a context of yawning, and less frequently after a burst of laughing or relatively mild facial trauma (slap, punch on the chin). We report a case of TMJ occurring in an uncommon circumstance: vaginal delivery. A woman aged 24-years with no special past medical history; primipara was admitted in the Department of Maternity of the University Hospital Hassan II of Fez for an imminent delivery of a twin pregnancy. Ten minutes after admission, the patient delivered vaginally with episiotomy. She gave birth to twins weighing 2800 g and 2400 g. During labour, and due to efforts of crying, the patient developed a sudden and immediate loss of function of the temporo-mandibular joint, with difficulty of speaking, the mouth permanently opened and with the chin lowered and thrown forward. The examination found an empty glenoid fossa of the temporo-mandibular joint in both sides. The diagnosis of dislocation of the TMJ was established. A CT scan of facial bones was done, objectifying a bilateral dislocation of TMJ. The reduction of this dislocation was performed in the operating room under sedation. PMID:21293750

El Bouazzaoui, Abderrahim; Labib, Smael; Derkaoui, Ali; Adnane Berdai, Mohammed; Bendadi, Azzeddine; Harandou, Mustapha

2010-01-01

335

Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types  

PubMed Central

Objective The aim of this study was to evaluate whether vertical facial patterns influence maximal occlusal force (MOF), masticatory muscle electromyographic (EMG) activity, and medial mandibular flexure (MMF). Material and Methods Seventy-eight dentate subjects were divided into 3 groups by Ricketts's analysis: brachyfacial, mesofacial and dolychofacial. Maximum occlusal force in the molar region was bilaterally measured with a force transducer. The electromyographic activities of the masseter and anterior temporal muscles were recorded during maximal voluntary clenching. Medial mandibular flexure was calculated by subtracting the intermolar distance of maximum opening or protrusion from the distance in the rest position. The data were analyzed using ANOVA followed by Tukey's HSD test. The significance level was set at 5%. Results Data on maximum occlusal force showed that shorter faces had higher occlusal forces (P<0.0001). Brachyfacial subjects presented higher levels of masseter electromyographic activity and medial mandibular flexure, followed by the mesofacial and dolychofacial groups. Additionally, dolychofacial subjects showed significantly lower electromyographic temporalis activities (P<0.05). Conclusion Within the limitations of the study, it may be concluded that maximum occlusal force, masticatory muscle activity and medial mandibular flexure were influenced by the vertical facial pattern. PMID:21655772

CUSTODIO, William; GOMES, Simone Guimaraes Farias; FAOT, Fernanda; GARCIA, Renata Cunha Matheus Rodrigues; DEL BEL CURY, Altair Antoninha

2011-01-01

336

Guided tissue regeneration enhances osteogenesis in a rat mandibular distraction osteogenesis model  

Microsoft Academic Search

Introduction: Guided tissue regeneration (GTR) utilizes barrier materials to create environments that favor tissue regeneration. In the current study, we applied the principle of GTR to our rat mandibular distraction osteogenesis (DO) model in an attempt to enhance bone regeneration.Methods: Osteoconductive Gore Resolut XT membranes (a co-polymer of polylactic acid and polyglycolic acid) were used in this study. Twelve (n

Tony D. Fang; Randall Nacamuli; HanJoon Song; Kenton Fong; Stephen Warren; Michael T. Longaker

2004-01-01

337

Modification of mandibular advancement osteotomy in a patient with Hanhart syndrome.  

PubMed

The oromandibular limb hypogenesis syndrome is a group of anomalies affecting the mandible, tongue, and maxilla with or without reductive limb anomalies. It was first described by Hanhart in 1950. In severe syndromic cases of mandibular hypoplasia, a number of techniques have been described for mandibular advancement including sagittal split osteotomies, segmental osteotomies, or distraction osteogenesis just to name a few. A 25-year-old male patient presented to our clinic with symptoms including difficulty in speech and eating, disability in opening the mouth, together with hand and foot abnormalities; we want to describe a modification in the technique of mandibular advancement and the patient's late postoperative results. The design of the step osteotomy is modified by softening the angles of the steps and elongating the horizontal segment of the step to approximately 25 mm to allow for a more efficient advancement of the mandible. The postoperative period was uneventful, with no signs of inferior alveolar nerve disturbance. The patient showed an increase of the mouth opening distance immediately after surgery. We believe that this tongue-in-groove-like modified mandibular step osteotomy technique is a good alternative in patients where advancement greater than 15 mm is required, preserving the nerve and achieving solid bony intact surfaces. PMID:24220429

U?urlu, Kemal; Sevim, Kamuran Zeynep; Akcal, Arzu; Karsidag, Semra

2013-11-01

338

MANDIBULAR REPATTERNING RESULTS FROM IN UTERO ANTAGONISM OF ENDOTHELIN RECEPTORS IN MICE  

EPA Science Inventory

BRANNEN, K.C.1,2, E.S. HUNTER1,2, M.B. ROSEN2, and J.M. ROGERS1,2. 1Curriculum in Toxicology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; 2Reproductive Toxicology Division, NHEERL, U.S. EPA, Research Triangle Park, North Carolina. Mandibular repatte...

339

Central giant cell granuloma of the mandibular condyle: a case report and review of the literature.  

PubMed

Central giant cell granuloma (CGCG) is a benign intraosseous lesion. The true nature of this lesion is controversial and remains unknown; the three competing theories are that it could be a reactive lesion, a developmental anomaly or a benign neoplasm. Furthermore, the actual aetiology of CGCG is still unclear, although inflammation, haemorrhage and local trauma have all been suggested; it has also been hypothesized that CGCG may have a genetic aetiology. Lesions central to the mandibular condylar head are very rare, with only three documented cases in the English language literature, none of which elaborates on the CT features. In this case report, a 31-year-old male patient complaining of a left pre-auricular mass underwent radiographic investigation. CT images revealed a lesion central to the mandibular condyle and demonstrated features that were highly suggestive of CGCG. The patient underwent surgical curettage, and the subsequent histopathological examination confirmed the diagnosis of CGCG. 3 years after the procedure the patient presented with a recurrence and underwent complete resection of the mandibular condyle with immediate reconstruction. This report presents CT characteristics of a rare occurrence of CGCG of the mandibular condyle, compares it with other published cases and poses the question of the role of radiology in predicting the degree of aggressive behaviour of these lesions before surgery. PMID:21159917

Jadu, F M; Pharoah, M J; Lee, L; Baker, G I; Allidina, A

2011-01-01

340

Endodontic management of a mandibular second molar with radix entomolaris: a case report  

PubMed Central

The presence of radix entomolaris (RE) in a mandibular first molar is a common occurrence in certain ethnic groups, but the presence of RE in a mandibular second molar is a rare occurrence. In the present case, RE was identified from preoperative radiographs and confirmed using cone-beam computed tomography (CBCT). The access cavity was modified to locate the RE. Cleaning and shaping were performed with nickel-titanium rotary instruments. Obturation was completed with gutta-percha cones using AH Plus (Dentsply Detrey GmbH) as sealer. From the CBCT axial images, the RE was determined to have a Type III curvature by the De Moor classification, Type B separate RE by the Carlsen and Alexandersen classification, and radiographically, a Type i image by the Wang classification. The presence of RE in the mandibular second molar makes it essential to anticipate and treat the distolingual root canal. This case report highlights the usefulness of CBCT for assessing RE in the mandibular second molar, which can help the clinician in making a confirmatory diagnosis and assessing the morphology of the root canal. PMID:24790927

Kandaswamy, Deivanayagam; Jayaprakash, Nachimuthu

2014-01-01

341

Internal mandibular distraction to relieve airway obstruction in children with severe micrognathia.  

PubMed

Congenital craniofacial malformations such as Pierre Robin sequence or Treacher Collins syndrome are associated with mandibular micrognathia, resulting in obstructive sleep apnea (OSA) due to a decreased pharyngeal airway; in severe cases this leads to tracheostomy dependence. We present a series of 18 patients in whom we performed mandibular lengthening using internal distraction devices to relieve airway obstruction. Seven were tracheostomy-dependent and 11 were respiratory distressed without tracheostomy. The mandible was distracted at a rate of 1mm per day. Following 3 months of consolidation for bony maturation, the distraction devices were removed. Results demonstrated forward mandibular elongation of a mean 22mm (range 20-25mm) and an increase in SNB angle and in pharyngeal airway. All patients with tracheostomies were decannulated, and there was an improved airway with resolution of signs and symptoms of OSA and elimination of oxygen requirement in all patients. We conclude that mandibular distraction using internal devices is a useful and comfortable method for younger children to expand the mandible forward and increase the pharyngeal airway. PMID:25052572

Rachmiel, A; Emodi, O; Rachmiel, D; Aizenbud, D

2014-10-01

342

Risk Factors and Surgical Refinements of Postresective Mandibular Reconstruction: A Retrospective Study  

PubMed Central

Background. Postresective mandibular reconstruction is common in cases of oral and mandibular tumors. However, complications such as infection, plate exposure, or plate fracture can occur. We identified several significant risk factors of complications after reconstructive surgery and compared the effectiveness of different surgical techniques for reducing the incidence of complications. Methods. This study is a retrospective analysis of 28 oromandibular cancer cases that required reconstructive surgery between January 1999 and December 2011 at Kobe University Graduate School of Medicine in Japan. All cases were classified using Hashikawa's CAT and Eichner's classification methods. Then, we determined whether these classifications and different treatment or surgical methods were significantly related to complications. Results. Complications after mandibular reconstruction occurred in 10/28 patients (36%). Specifically, five patients had plate fractures, four had plate exposures, and one had an infection. Radiation therapy and closure without any flaps were significantly related to infection or plate exposure. The wrap-around technique of securing reconstruction plates was used in 14 cases, whereas the run-through technique was used in two cases. Conclusions. The success of mandibular reconstruction depends on both mechanical and biological factors, such as the location of defects, presence of occlusions, and the amount of vascularization of the flap.

Sakakibara, Akiko; Hashikawa, Kazunobu; Yokoo, Satoshi; Sakakibara, Shunsuke; Komori, Takahide; Tahara, Shinya

2014-01-01

343

The mandibular symphysis as a donor site in maxillofacial bone grafting: A quantitative anatomic study  

Microsoft Academic Search

Purpose: The goal of this study was to quantify the amount of bone graft material present in the mandibular symphysis as well as to determine the maximal size of the corticocancellous bone block that can be harvested while avoiding mental nerve injury, tooth injury, and simultaneously preserving the preoperative facial contour. Materials and Methods: Sixteen fixed dentate cadaver mandibles were

Andre Montazem; David V Valauri; Hugo St-Hilaire; Daniel Buchbinder

2000-01-01

344

Hydroxylapatite Otologic Implants  

SciTech Connect

A Cooperative Research and Development Agreement (CRADA) between Lockheed Martin Energy Research Corporation (LMER) and Smith and Nephew Richards Inc. of Bartlett, TN, was initiated in March 1997. The original completion date for the Agreement was March 25, 1998. The purpose of this work is to develop and commercialize net shape forming methods for directly creating dense hydroxylapatite (HA) ceramic otologic implants. The project includes three tasks: (1) modification of existing gelcasting formulations to accommodate HA slurries; (2) demonstration of gelcasting to fabricate green HA ceramic components of a size and shape appropriate to otologic implants: and (3) sintering and evaluation of the HA components.

McMillan, A.D.; Lauf, R.J.; Beale, B.; Johnson, R.

2000-01-01

345

Repositioning template for mandibular reconstruction with fibular free flaps: an alternative technique to pre-plating and virtual surgical planning.  

PubMed

Oral malignancies involving the mandibular bone require a complex reconstructive plan. Mandibular reconstruction with a fibular free flap is currently considered the best choice for functional and aesthetic rehabilitation after oncological surgery. This flap can be modelled with multiple osteotomies and can provide bone, muscle and skin for composite reconstruction. One of the most delicate aspects of mandibular reconstruction is the technique of bone modelling; the risk of prolonging the period of ischaemia and not restoring the correct maxillomandibular and occlusal relationships can ultimately lead to a higher rate of complications as well as poor aesthetic and functional results. Recently, there has been rising interest in virtual surgical planning and computer-assisted mandibular reconstruction in pre-operative planning; however, this is not always possible because of the costs involved and the set-up time for the entire procedure. In this paper, we present a simple and inexpensive technique for fibular free flap modelling and repositioning after segmental resection of the mandible; the technique entails the pre-operative preparation of a resin repositioning template on a stereolithographic model. This technique has been successfully applied in four cases: two cases underwent resection involving only the mandibular body, one case involving the mandibular body and symphysis and one case in which a ramus to ramus resection was performed. In this preliminary report, we show that the resin repositioning template is an easy, safe and useful tool for mandibular reconstruction with a fibular free flap. PMID:25210223

Berrone, M; Crosetti, E; Succo, G

2014-08-01

346

A case of recovery of oral function with dental implants following facial bone trauma.  

PubMed

A 44-year-old woman had sustained facial lacerations, loss of several teeth, alveolar bone fracture, and severe vertical bone resorption in conjunction with a shattered alveolar bone and marked loss of intraoral function and facial disfigurement in a car accident. She underwent 9 surgical procedures by plastic surgeons to treat the facial lesions, including hold facial scar formation reduction surgery, reduction of fractures of the nasal and cheek bones, and bone transplants. To restore intraoral function and improve facial appearance, plastic surgeons transplanted a rib into the maxillary sinus while dental surgeons simultaneously inserted 5 dental implants. Eleven months after the dental implant surgery, a complete upper denture and a mandibular gingival ceramometal-casting crown were fitted. After insertion of the final prosthodontics, regular follow-up examinations were performed to check dental occlusion, oral hygiene, and the condition of the gingival tissue. In the years since the upper dental implants were fitted, there have been no bone resorption and no functional problems. Transplantation of rib bones is an effective method for maxillary reconstruction and remains effective even after the insertion of dental implants. The patient is extremely satisfied with the results. A means of maintaining oral health over the long term, and of motivating the patient to maintain oral health, should be established. PMID:23291849

Kamoi, Hisahiro

2012-01-01

347

The silicone breast implant controversy.  

PubMed

Feminists call it objectification. Consumer advocates call it victimization. Medical personnel call it augmentation. Women, implantation. Whatever the term, media hype and the increasing number of lawsuits against U.S. manufacturers of silicone breast implants has caused widespread concern among women and raised serious questions about the long term health risks and safety of breast implant devices. PMID:7780923

Guerette, P H

1995-02-01

348

Clinical Application of Curvilinear Distraction Osteogenesis for Correction of Mandibular Deformities  

PubMed Central

Purpose To report the use of a semiburied curvilinear distraction device, with a 3-D CT treatment planning system, for correction of mandibular deformities. Methods This is a retrospective evaluation of 13 consecutive patients, with syndromic and non-syndromic micrognathia, who underwent correction by curvilinear distraction osteogenesis. A 3-D CT scan was obtained for each patient and imported into a 3-D treatment planning system (Slicer/Osteoplan™). Surgical guides were constructed to localize the osteotomy and to drill holes for securing the distractor’s proximal and distal footplates to the mandible. Postoperatively, patients were followed by clinical examination and plain radiographs to ensure the desired vector of movement. At end distraction, when possible, a 3-D CT scan was obtained to document the final mandibular position. Results Eight females and 5 males with a mean age of 11.9 years (range=15months–39 years) underwent bilateral mandibular curvilinear distraction. Eight of the 13 patients were 16 years or younger and 5 were less than 6 years of age. The diagnoses included Treacher Collins (n=3) and Nager (n=3) syndromes, craniofacial microsomia (n=2), post-traumatic ankylosis (n=1), and micrognathia (syndromic, n=3; non-syndromic, n=1). Correct distractor placement, vector of movement and final mandibular position were achieved in 10/13 patients. In the other 3 patients, desired jaw position was achieved by “molding” the regenerate. Conclusion The use of a semiburied curvilinear distraction device, with 3-dimensional treatment planning, is a potentially powerful tool to correct complex mandibular deformities. PMID:19375009

Kaban, Leonard B.; Seldin, Edward B.; Kikinis, Ron; Yeshwant, Krishna; Padwa, Bonnie L.; Troulis, Maria J.

2009-01-01

349

Soldier-Specific Modification of the Mandibular Motor Neurons in Termites  

PubMed Central

Social insects exhibit a variety of caste-specific behavioral tendencies that constitute the basis of division of labor within the colony. In termites, the soldier caste display distinctive defense behaviors, such as aggressively attacking enemies with well-developed mandibles, while the other castes retreat into the colony without exhibiting any aggressive response. It is thus likely that some form of soldier-specific neuronal modification exists in termites. In this study, the authors compared the brain (cerebral ganglion) and the suboesophageal ganglion (SOG) of soldiers and pseudergates (workers) in the damp-wood termite, Hodotermopsis sjostedti. The size of the SOG was significantly larger in soldiers than in pseudergates, but no difference in brain size was apparent between castes. Furthermore, mandibular nerves were thicker in soldiers than in pseudergates. Retrograde staining revealed that the somata sizes of the mandibular motor neurons (MdMNs) in soldiers were more than twice as large as those of pseudergates. The enlargement of MdMNs was also observed in individuals treated with a juvenile hormone analogue (JHA), indicating that MdMNs become enlarged in response to juvenile hormone (JH) action during soldier differentiation. This enlargement is likely to have two functions: a behavioral function in which soldier termites will be able to defend more effectively through relatively faster and stronger mandibular movements, and a developmental function that associates with the development of soldier-specific mandibular muscle morphogenesis in termite head. The soldier-specific enlargement of mandibular motor neurons was observed in all examined species in five termite families that have different mechanisms of defense, suggesting that such neuronal modification was already present in the common ancestor of termites and is significant for soldier function. PMID:18612458

Ishikawa, Yuki; Aonuma, Hitoshi; Miura, Toru

2008-01-01

350

Dose-dependent effects of genistein on bone homeostasis in rats' mandibular subchondral bone  

PubMed Central

Aim: To investigate the effect of genistein on bone homeostasis in mandibular subchondral bone of rats. Methods: Female SD rats were administered with genistein (10 and 50 mg/kg) or placebo by oral gavage for 6 weeks. Then the animals were sacrificed, and histomorphology and micro-structure of mandibular condyle were examined using HE staining and micro-CT analysis, respectively. The expression levels of alkaline phosphatase (ALP), osteocalcin (OC), osteoprotegerin (OPG), the receptor activator of nuclear factor ?B ligand (RANKL) and estrogen receptors (ERs) in mandibular condyle were detected using real-time PCR. Cultured osteoblasts were prepared from rat mandibular condyle for in in vitro study. The cells were treated with genistein (10?7 or 10?4 mol/L) for 48 h. The expression of the bone homeostasis-associated factors and estrogen receptors (ERs) was detected using real-time PCR, and ER silencing was performed. Results: At both the low- and high-doses, genistein significantly increased the bone mineral density (BMD) and bone volume, and resulted in thicker subchondral trabecular bone in vivo. In both in vivo and in vitro study, the low-dose genistein significantly increased the expression of ALP, OC and OPG, but decreased the expression of RANKL and the RANKL/OPG ratio. The high-dose genistein decreased the expression of all these bone homeostasis-associated factors. Both the low and high doses of genistein significantly increased the expression of ER?, while ER? expression was increased by the low dose genistein and decreased by the high dose genistein. ER? silencing abrogated most of the effects of genistein treatment. Conclusion: In rat mandibular condylar subchondral bone, low-dose genistein increases bone formation and inhibit bone resorption, while excess genistein inhibits both bone formation and resorption. The effects of genistein were predominantly mediated through ER?. PMID:22120966

Li, Yong-qi; Xing, Xiang-hui; Wang, Hui; Weng, Xi-li; Yu, Shi-bin; Dong, Guang-ying

2012-01-01

351

Bone marrow stromal cells cultured on poly (lactide-co-glycolide)/nano-hydroxyapatite composites with chemical immobilization of Arg-Gly-Asp peptide and preliminary bone regeneration of mandibular defect thereof.  

PubMed

Polyethyleneimine (PEI) was used to create active groups on the poly (lactide-co-glycolide)/nano-hydroxyapatite (PLGA/NHA) surface and Arg-Gly-Asp (RGD) was grafted on the active groups and novel PLGA/NHA 2-D membranes and 3D scaffolds modified with RGD were obtained. X-ray photoelectron spectrum (XPS) results show that sulfur displays only on the modified surface. The RGD-modified PLGA/NHA materials also have much lower static water contact angle and much higher water-absorption ability, which shows that after chemical treatment, the modified materials show better hydrophilic properties. Atomic force microscope (AFM) shows that after surface modification, the surface morphology of PLGA is greatly changed. All these results indicate that RGD peptide has successfully grafted on the surface of PLGA. Rabbit bone marrow stromal cells (MSCs) were seeded in the 2D membranes and 3D scaffolds materials. The influences of the RGD on the cell attachment, growth and differentiation, and proliferation on the different materials were studied. The modified scaffolds were implanted into rabbits to observe preliminary application in regeneration of mandibular defect. The PLGA/NHA-RGD presents better results in bone regeneration in rabbit mandibular defect. PMID:20872750

Huang, Yanxia; Ren, Jie; Ren, Tianbin; Gu, Shuying; Tan, Qinggang; Zhang, Lihong; Lv, Kaige; Pan, Kefeng; Jiang, Xinquan

2010-12-15

352

Root Canal Treatment of Mandibular Second Premolar with Three Separate Roots and Canals Using Spiral Computed Tomographic  

PubMed Central

Anatomic and internal morphology of a root canal system is more complex and differs for each individual tooth of which mandibular premolars have earned the reputation for having aberrant anatomy. The occurrence of three canals with three separate foramina in mandibular second premolars is very rare. A wider knowledge on both clinical and radiological anatomy especially spiral computed tomographic is absolutely essential for the success of endodontic treatment. These teeth may require skillful and special root canal special shaping and obturating techniques. This paper reports an unusual case of a mandibular second premolar with atypical canal pattern that was successfully treated endodontically. PMID:25101187

Hariharavel, V. P.; Kumar, A. Ashok; Ganesh, C.; Aravindhan, R.

2014-01-01

353

Oxygen implanter for simox  

Microsoft Academic Search

Interest in silicon or) insulator (SOI) technology has led to the development of several alternatives to silicon on sapphire. One of the most promising techniques makes use of an ion implanter to form a buried oxide layer directly in the silicon substrate. To have useful single crystalline silicon on top of the oxide layer, it is necessary to do the

M. Guerra; V. Benveniste; G. Ryding; D. H. Douglas-Hamilton; M. Reed; G. Gagne; A. Armstrong; M. Mack

1985-01-01

354

Ion implantation in semiconductors  

Microsoft Academic Search

Ion implantation is being applied extensively to silicon device technology. Two principle features are utilized- 1) charge control in MOS structures for threshold shift, autoregistration, and complementary wells and 2) distribution control in microwave and bipolar structures. Another feature that has not been extensively exploited is to combine the advantages of the high resolution capabilities of electric beam pattern delineation

James W. Mayer

1973-01-01

355

Semiconductor Ion Implanters  

NASA Astrophysics Data System (ADS)

In 1953 the Raytheon CK722 transistor was priced at 7.60. Based upon this, an Intel Xeon Quad Core processor containing 820,000,000 transistors should list at 6.2 billion! Particle accelerator technology plays an important part in the remarkable story of why that Intel product can be purchased today for a few hundred dollars. Most people of the mid twentieth century would be astonished at the ubiquity of semiconductors in the products we now buy and use every day. Though relatively expensive in the nineteen fifties they now exist in a wide range of items from high-end multicore microprocessors like the Intel product to disposable items containing `only' hundreds or thousands like RFID chips and talking greeting cards. This historical development has been fueled by continuous advancement of the several individual technologies involved in the production of semiconductor devices including Ion Implantation and the charged particle beamlines at the heart of implant machines. In the course of its 40 year development, the worldwide implanter industry has reached annual sales levels around 2B, installed thousands of dedicated machines and directly employs thousands of workers. It represents in all these measures, as much and possibly more than any other industrial application of particle accelerator technology. This presentation discusses the history of implanter development. It touches on some of the people involved and on some of the developmental changes and challenges imposed as the requirements of the semiconductor industry evolved.

MacKinnon, Barry A.; Ruffell, John P.

2011-06-01

356

Elementary Implantable Force Sensor  

PubMed Central

Implementing implantable sensors which are robust enough to maintain long term functionality inside the body remains a significant challenge. The ideal implantable sensing system is one which is simple and robust; free from batteries, telemetry, and complex electronics. We have developed an elementary implantable sensor for orthopaedic smart implants. The sensor requires no telemetry and no batteries to communicate wirelessly. It has no on-board signal conditioning electronics. The sensor itself has no electrical connections and thus does not require a hermetic package. The sensor is an elementary L-C resonator which can function as a simple force transducer by using a solid dielectric material of known stiffness between two parallel Archimedean coils. The operating characteristics of the sensors are predicted using a simplified, lumped circuit model. We have demonstrated sensor functionality both in air and in saline. Our preliminary data indicate that the sensor can be reasonably well modeled as a lumped circuit to predict its response to loading. PMID:24883335

Wachs, Rebecca A.; Ellstein, David; Drazan, John; Healey, Colleen P.; Uhl, Richard L.; Connor, Kenneth A.

2014-01-01

357

Implantable Impedance Plethysmography  

PubMed Central

We demonstrate by theory, as well as by ex vivo and in vivo measurements that impedance plethysmography, applied extravascularly directly on large arteries, is a viable method for monitoring various cardiovascular parameters, such as blood pressure, with high accuracy. The sensor is designed as an implant to monitor cardiac events and arteriosclerotic progression over the long term. PMID:25123467

Theodor, Michael; Ruh, Dominic; Ocker, Martin; Spether, Dominik; Forster, Katharina; Heilmann, Claudia; Beyersdorf, Friedhelm; Manoli, Yiannos; Zappe, Hans; Seifert, Andreas

2014-01-01

358

Implant-Supported Bridge  

MedlinePLUS

... can be built up using bone augmentation or grafting before the actual implant procedure begins. How Does It Work? In some cases, ... the space created by the missing tooth. Second procedure Month 4 or 5 (no bone grafting, lower jaw) Month 6 or 7 (no bone ...

359

Implantable Drug Dispenser  

NASA Technical Reports Server (NTRS)

Drugs such as insulin are injected as needed directly into bloodstream by compact implantable dispensing unit. Two vapor cavities produce opposing forces on drug-chamber diaphragm. Heaters in cavities allow control of direction and rate of motion of bellows. Dispensing capsule fitted with coil so batteries can be recharged by induction.

Collins, E. R. J.

1983-01-01

360

MR evaluation of breast implants.  

PubMed

This article describes the rationale and indications for breast implant-related magnetic resonance (MR) imaging, alone or in combination with breast cancer-related MR imaging. Basic silicone chemistry, implant styles, and normal appearances of breast implants are described. The various presentations of breast implant rupture are described, and a 4-point staging scheme for intracapsular rupture is reviewed. Finally, a discussion of what the reviewing physician needs to know is presented, both before breast implant MR examinations are requested and afterward, when results are reported. PMID:24792659

Middleton, Michael S

2014-05-01

361

Complete mouth reconstruction with implant-supported fixed partial dental prostheses fabricated with zirconia frameworks: a 4-year clinical follow-up.  

PubMed

Few scientific reports regarding the success of complete mouth partial fixed dental prostheses frameworks fabricated with zirconia are available, especially when dental implants serve as the abutments. A complete mouth reconstruction with zirconia frameworks veneered with feldspathic porcelain is reported involving a 65-year-old white woman who presented with partial edentulism and an unrestorable remaining dentition. After examination, 14 implants were planned (8 in the maxillary arch and 6 in the mandibular arch), and implant-supported zirconia framework screw-retained partial fixed dental prostheses (ISZPFDPs) were fabricated and made in sections for easier retrievability and management. No major complications were encountered during follow-up appointments at 6-month intervals for 4 years. However, minor fractures of the veneering ceramic were noted 4 years after placement. The ISZPFDPs were well accepted by the patient and had a favorable outcome in terms of patient acceptability and success, despite some complications. PMID:24674806

Puri, Shweta; Parciak, Ewa C; Kattadiyil, Mathew T

2014-09-01

362

Evaluation of stability changes in magnesium-incorporated titanium implants in the early healing period.  

PubMed

The aim of the present study was to determine the bone response to magnesium (Mg) ion-incorporated titanium (Ti) implants during the early healing period. A total of 114 patients (69 men and 45 women aged between 29 and 71 years) participated in the study. Overall, one hundred thirty-three 10-mm-long fixtures were installed, composed of 65 Mg ion-incorporated fixtures in the test group (55 participants; 30 males and 25 females) and 68 resorbable blast media (RBM) surface fixtures in the control group (59 participants; 39 males and 20 females). The bone responses were evaluated by resonance frequency analysis (RFA) at the following time points after implant insertion (ie, the healing period): 0, 2, 4, 8, and 12 weeks. Each time an RFA measurement was taken, the stability changes relating to both bone quality and implant arch location (maxilla or mandible) were recorded for further analysis. The mean stabilities were lowest at week 4 of healing for both the test and control groups. Significant differences in RFA values between the 2 groups were found at week 12 of healing. The mean percentage change in implant stability quotient (ISQ) from the baseline revealed that the implant stability of the Mg ion-incorporated test group had increased (4.55%) more than the RBM surface group (2.23%) by week 12 of healing. With respect to bone quality, the mean ISQ of Mg-incorporated Ti implants only changed significantly during the 12-week period for type 4 bone. Furthermore, at weeks 4 and 12 of healing, significant differences were found between the 2 groups for type 2 and type 4 bone. A comparison of the stability patterns of mandibular and maxillary implants revealed that the overall stability was higher in the mandible; however, no significant difference was found for Mg-incorporated Ti implants. The Mg-incorporated Ti implants exhibited a slightly better bone response with respect to ISQ than did the RBM surface implants, and the percentage change in mean ISQ from the baseline was greater for the Mg-incorporated group than for the RBM surface group at the end point of this study. PMID:24036725

Hieu, Pham Duong; Baek, Dong Heon; Park, Dong Soo; Park, Jong-Tae; Hong, Ki Seok

2013-09-01

363

Management of peri-implant mucositis and peri-implantitis.  

PubMed

Peri-implant diseases are defined as inflammatory lesions of the surrounding peri-implant tissues and include peri-implant mucositis (an inflammatory lesion limited to the surrounding mucosa of an implant) and peri-implantitis (an inflammatory lesion of the mucosa that affects the supporting bone with resulting loss of osseointegration). This review aims to describe the different approaches to manage both entities and to provide a critical evaluation of the evidence available on their efficacy. Therapy of peri-implant mucositis and nonsurgical therapy of peri-implantitis usually involve mechanical debridement of the implant surface using curettes, ultrasonic devices, air-abrasive devices or lasers, with or without the adjunctive use of local antibiotics or antiseptics. The efficacy of these therapies has been demonstrated for mucositis: controlled clinical trials show an improvement in clinical parameters, especially in bleeding on probing. For peri-implantitis, the results are limited, especially in terms of probing pocket-depth reduction. Surgical therapy of peri-implantitis is indicated when nonsurgical therapy fails to control the inflammatory changes. Selection of the surgical technique should be based on the characteristics of the peri-implant lesion. In the presence of deep circumferential and intrabony defects, surgical interventions should aim to provide thorough debridement, implant-surface decontamination and defect reconstruction. In the presence of defects without clear bony walls or with a predominant suprabony component, the aim of the surgical intervention should be the thorough debridement and the repositioning of the marginal mucosa to enable the patient to perform effective oral-hygiene practices, although this aim may compromise the esthetic result of the implant-supported restoration. PMID:25123773

Figuero, Elena; Graziani, Filippo; Sanz, Ignacio; Herrera, David; Sanz, Mariano

2014-10-01

364

Pathological (late) fractures of the mandibular angle after lower third molar removal: a case series  

PubMed Central

Introduction Pathological (late) fracture of the mandibular angle after third molar surgery is very rare (0.005% of third molar removals). There are 94 cases reported in the literature; cases associated with osseous pathologies such as osteomyelitis or any local and systemic diseases that may compromise mandibular bone strength have not been included. We describe three new cases of pathological (late) fracture of the mandibular angle after third molar surgery. Case presentations The first patient was a 27-year-old Caucasian man who had undergone surgical removal of a 3.8, mesioangular variety, class II-C third molar 20 days before admission to our clinic. The fracture of his left mandibular angle, complete and composed, occurred during chewing. The second patient was a 32-year-old Caucasian man. He had undergone surgical removal of a 3.8, mesioangular variety, class II-B third molar 22 days before his admission. The fracture, which occurred during mastication, was studied by computed tomography that showed reparative tissue in the fracture site. The third patient was a 36-year-old Caucasian man who had undergone surgical removal of a 3.8, vertical variety, class II-C third molar 25 days before the observation. In this case the fracture of his mandibular angle was oblique (unfavorable), complete and composed. The fracture had occurred during chewing. We studied the fracture by optical projection tomography and computed tomography. All of the surgical removals of the 3.8 third molars, performed by the patients’ dentists who had more than 10 years of experience, were difficult. We treated the fractures with open surgical reduction, internal fixation by titanium miniplates and intermaxillary elastic fixation removed after 6 weeks. Conclusions The literature indicates that the risk of pathological (late) fracture of the mandibular angle after third molar surgery for total inclusions (class II-III, type C) is twice that of partial inclusions due to the necessity of ostectomies more generous than those for partial inclusions. Other important factors are the anatomy of the teeth and the features of the teeth roots. These fractures predominantly occur in patients who are older than 25 years. The highest incidence (67.8% of cases) is found in the second and third week postsurgery. We emphasize that before the third molar surgery it is extremely important to always provide adequate instructions to the patient in order to avoid early masticatory loads and prevent this rare event. PMID:23631557

2013-01-01

365

Adjacent dentigerous cysts with the ectopic displacement of a third mandibular molar and supernumerary (forth) molar: a rare occurrence.  

PubMed

Dentigerous cysts are the most common odontological cysts of the jaws, being associated with the crowns of permanent teeth, especially unerupted mandibular third molars. Multiple dentigerous cysts are rare and most often occur in association with a developmental syndrome. This article presents an unusual case of nonsyndromic adjacent dentigerous cysts associated with a mandibular third molar and a supernumerary molar. This occurrence has not been previously reported. PMID:19464637

McCrea, Shane

2009-06-01

366

Bone Substitutes for Peri-Implant Defects of Postextraction Implants  

PubMed Central

Placement of implants in fresh sockets is an alternative to try to reduce physiological resorption of alveolar ridge after tooth extraction. This surgery can be used to preserve the bone architecture and also accelerate the restorative procedure. However, the diastasis observed between bone and implant may influence osseointegration. So, autogenous bone graft and/or biomaterials have been used to fill this gap. Considering the importance of bone repair for treatment with implants placed immediately after tooth extraction, this study aimed to present a literature review about biomaterials surrounding immediate dental implants. The search included 56 articles published from 1969 to 2012. The results were based on data analysis and discussion. It was observed that implant fixation immediately after extraction is a reliable alternative to reduce the treatment length of prosthetic restoration. In general, the biomaterial should be used to increase bone/implant contact and enhance osseointegration. PMID:24454377

Santos, Pamela Leticia; Gulinelli, Jessica Lemos; Telles, Cristino da Silva; Betoni Junior, Walter; Chiacchio Buchignani, Vivian; Queiroz, Thallita Pereira

2013-01-01

367

Characteristics of bony changes and tooth displacement in the mandibular cystic lesion involving the impacted third molar  

PubMed Central

Objectives The purpose of this retrospective study is to find the differentiating characteristics of cystic and cystic-appearing lesions that involve the impacted mandibular third molar by analyzing panoramic radiographs and computed tomography images, and to aid the preoperative diagnosis. Materials and Methods Eighty-one patients who had a mandibular cystic or cystic-appearing lesion that involved impacted mandibular third molar and underwent cyst enucleation were included in the study. The preoperative panoramic radiograph and computed tomography findings were analyzed in accordance to the histopathologic type. Results Most of the cystic lesions containing the mandibular third molar were diagnosed as a dentigerous cyst (77.8%). The occurrence of mesio-distal displacement of the third molar was more frequent in the odontogenic keratocyst (71.4%) and in the ameloblastoma (85.7%) than in the dentigerous cyst (19.1%). Downward displacement was primarily observed in each group. Odontogenic keratocyst and ameloblastoma showed more aggressive growth pattern with higher rate of bony discontinuity and cortical bone expansion than in dentigerous cyst. Conclusion When evaluating mandibular cystic lesions involving the impacted mandibular third molar, dentigerous cyst should first be suspected. However, when the third molar displacement and cortical bone absorption are observed, then odontogenic keratocyst or ameloblastoma should be considered. PMID:25368835

Lee, Jin-Hyeok; Kim, Sung-Min; Kim, Hak-Jin; Jeon, Kug-Jin; Park, Kwang-Ho

2014-01-01

368

Lidocaine concentration in mandibular bone after subperiosteal infiltration anesthesia decreases with elevation of periosteal flap and irrigation with saline.  

PubMed

It has been reported that the action of infiltration anesthesia on the jawbone is attenuated significantly by elevation of the periosteal flap with saline irrigation in clinical studies; however, the reason is unclear. Therefore, the lidocaine concentration in mandibular bone after subperiosteal infiltration anesthesia was measured under several surgical conditions. The subjects were 48 rabbits. Infiltration anesthesia by 0.5 mL of 2% lidocaine with 1?:?80,000 epinephrine (adrenaline) was injected into the right mandibular angle and left mandibular body, respectively. Under several surgical conditions (presence or absence of periosteal flap, and presence or absence of saline irrigation), both mandibular bone samples were removed at a fixed time after subperiosteal infiltration anesthesia. The lidocaine concentration in each mandibular bone sample was measured by high-performance liquid chromatography. As a result, elevation of the periosteal flap with saline irrigation significantly decreased the lidocaine concentration in the mandibular bone. It is suggested that the anesthetic in the bone was washed out by saline irrigation. Therefore, supplemental conduction and/or general anesthesia should be utilized for long operations that include elevation of the periosteal flap with saline irrigation. PMID:24932978

Ogawa, Sachie; Watanabe, Masahiro; Kawaai, Hiroyoshi; Tada, Hitoshi; Yamazaki, Shinya

2014-01-01

369

The effect of mandibular anterior teeth on the hypermobile tissue in the anterior part of the maxilla.  

PubMed

The absence of posterior occlusal contacts may result in increased anterior occlusal contacts and forces between natural mandibular dentition and artificial maxillary dentition. The impact of natural mandibular anterior teeth on the development of hypermobile tissues in the anterior part of the edentulous maxillary alveolar ridge was investigated in this study. The study group consisted of 410 patients with maxillary complete dentures and various mandibular dentitions from seven rest homes in Istanbul. The data; including hypermobile tissue in the anterior part of the maxilla, occlusal relationship, nocturnal wear, denture age, and duration of the maxillary full edentulism period were recorded. A chi-square test was performed to analyze the effects of following data: Existence of mandibular anterior teeth, poor adaptation of the dentures, nocturnal wear, types of occlusal contacts, and gender, on the resorption of the anterior part of the maxilla. To examine the effects of the presence of anterior mandibular teeth and early maxillary edentulism on bone resorption in the anterior part of the maxilla, a logistic regression analysis was performed. The results reveal that patients with edentulous maxilla and natural mandibular anterior teeth are approximately twice more likely to show risk of hypermobile tissue in the anterior part of the maxilla than are full edentulous patients. Further, edentulous periods exceeding 30 years in maxilla seem to increase this risk approximately 4 times. PMID:21669467

Sülün, Tonguç; Sakar, Olcay; Bilhan, Hakan; Ispirgil, Ebru

2012-01-01

370

Implant radiography and radiology.  

PubMed

The practitioner placing dental implants has many options with respect to pre-implant radiographic assessment of the jaws. The advantages and disadvantages of the imaging modalities currently available for pre-implant imaging are discussed in some detail. Intra-oral and extra-oral radiographs are generally low dose but the information provided is limited as the images are not three-dimensional. Tomography is three-dimensional, but the image quality is highly variable. Computed tomography (CT) has been the gold standard for many years as the information provided is three-dimensional and generally very accurate. However, CT examinations are expensive and deliver a relatively high radiation dose to the patient. The latest imaging modality introduced is cone beam volumetric tomography (CBVT) and this technology is very promising with regard to pre-implant imaging. CBVT generally delivers a lower dose to the patient than CT and provides reasonably sharp images with three-dimensional information. A comparison between CT and CBVT is provided. Magnetic resonance imaging is showing some promise, but the examinations are not readily available, generally expensive and bone is not well imaged. Magnetic resonance imaging is excellent for demonstrating soft tissues and therefore may be of great use in identifying the inferior dental nerve and vessels. All of the above technology is of little value if the information required is not obtained and so information is also provided on imaging of some of the vital structures. Of particular interest is the inferior dental canal, incisive canals of the mandible, genial foramina and canals, maxillary sinus and the incisive canal and foramen of the maxilla. PMID:18498579

Monsour, P A; Dudhia, R

2008-06-01

371

Chemical reactions of calcium phosphate implants after implantation in vivo  

Microsoft Academic Search

Sintered microporous cylinders of hydroxyapatite (OHA), tertiary calcium phosphate (ß-TCP and rhenanite (CaNaPO4) were implanted in the bone of the forehead of the domestic pig (Sus scrofa). Implants together with the surrounding bone were retrieved after 6 and 12 weeks. X-ray diffraction showed that OHA and ß-TCP maintain their crystal structure upon implantation. However, rhenanite is transformed completely into an

F. C. M. Driessens; M. M. A. Ramselaar; H. G. Schaeken; A. L. H. Stols; P. J. Mullem; J. R. Wijn

1992-01-01

372

Sub-meninges Implantation Reduces Immune Response to Neural Implants  

PubMed Central

Glial scar formation around neural interfaces inhibits their ability to acquire usable signals from the surrounding neurons. To improve neural recording performance, the inflammatory response and glial scarring must be minimized. Previous work has indicated that meningeally derived cells participate in the immune response, and it is possible that the meninges may grow down around the shank of a neural implant, contributing to the formation of the glial scar. This study examines whether the glial scar can be reduced by placing a neural probe completely below the meninges. Rats were implanted with sets of loose microwire implants placed either completely below the meninges or implanted conventionally with the upper end penetrating the meninges, but not attached to the skull. Histological analysis was performed 4 weeks following surgical implantation to evaluate the glial scar. Our results found that sub-meninges implants showed an average reduction in reactive astrocyte activity of 63% compared to trans-meninges implants. Microglial activity was also reduced for sub-meninges implants. These results suggest that techniques that isolate implants from the meninges offer the potential to reduce the encapsulation response which should improve chronic recording quality and stability. PMID:23370311

Markwardt, Neil T.; Stokol, Jodi; Rennaker, Robert L.

2013-01-01

373

Reconstruction plates to bridge mandibular defects: a clinical and experimental investigation in biomechanical aspects.  

PubMed

A retrospective study of 68 patients was carried out to assess the complications arising from the use of reconstruction plates in the maintainance of space and contour following mandibular segmental resection. Skin or mucosal perforation, plate fracture and loss of screw retention were the main complications. The most susceptible sites to screw loosening in the plates were situated nearest to and farthest from the resection margin on the proximal residual segments. Some of the possible causative biomechanical mechanisms of plate failure were studied using photoelastic models simulating the types of mandibular defect and plate fixation. Isochromatic fringe analysis was used to analyse stress lines in the bone surrounding screws. It was found that, during functional loading, moment and shear forces produced high concentrations of squeeze and press stress in this bone, causing bone resorption with consequent loss of screw retention. PMID:10609746

Yi, Z; Jian-Guo, Z; Guang-Yan, Y; Ling, L; Fu-Yun, Z; Guo-Cheng, Z

1999-12-01

374

Mandibular arteriovenous malformation: A rare life-threatening condition depicted on multidetector CT angiography  

PubMed Central

Arteriovenous malformation (AVM) of the mandible is a rare and potentially life-threatening condition which can lead to massive hemorrhage. The following is a description where a large mandibular AVM presented with torrential bleeding following tooth extraction for caries. An orthopantomogram (OPG) was performed which was suggestive of aneurysmal bone cyst or ameloblastoma. A computed tomography (CT) angiography revealed a large mandibular AVM with submandibular extension. It is important for both clinicians and radiologist to be aware of this type of lesion that can have life-threatening complications. It is important to define the anatomical location and the feeder vessels of the entity in detail preoperatively. This communication highlights the common differential and use of multidetector CT (MDCT) angiography along with other imaging modalities to prevent a fatal hemorrhage and arrive at a correct diagnosis. PMID:24959049

Dwivedi, Amit Nandan Dhar; Pandey, Anubha; Kumar, Ishan; Agarwal, Arjit

2014-01-01

375

Rapid, conservative, multidisciplinary miniscrew-assisted approach for treatment of mandibular fractures following plane crash  

PubMed Central

Mandibular fractures are among the most common facial injuries. This case report demonstrates the efficacy of simultaneous usage of miniscrews and direct bonding techniques without open reduction in an extensive traumatized patient. A 25-year-old girl with multiple injuries in the head and facial region 1 month after a plane crash accident was referred to manage the mandibular fractures. Due to the presence of multiple injuries, a conservative treatment of symphysiseal fracture was performed. In order to keep the fractured fragments of the mandible close together, the anterior teeth of the lower arch were tied by means of the orthodontic wire. Ten miniscrews were used to improve the anchorage units and also, settling the occlusion by means of light intermaxillary elastics. Following the active treatment, clinical and radiographic analysis showed satisfactory healing without any periodontal involvement of the teeth in the fracture line. PMID:24348629

Tehranchi, Azita; Behnia, Hossein; Younessian, Farnaz; Ghochani, Mostafa Sadeghi

2013-01-01

376

Bilateral pedicled nasolabial flaps for the anterior alveolus mandibular defect: a review.  

PubMed

With the increasingly wide spread application of microvascular free tissue transfer technique for oral cavity reconstruction, the routine need for variety of local and regional flap has decreased. However, a number of such flaps remains quite useful and should be included in modern armamentarium of reconstructive surgeon. Nasolabial flap is versatile, simple, easy to harvest local flap that can cover a variety of defect in face. We present the success and utility of bilateral pedicled flap for reconstruction of mandibular anterior alveolus after the wide excision of squamous cell carcinoma of mandibular anterior alveolus. And the restoration of esthetics and functional dental health with the artificial prosthesis. Patient had been followed for two years and six month with no signs of recurrence as yet. PMID:22190830

Deora, Shakti Singh; Nanjappa, Madan; Kumaraswamy, S V

2010-12-01

377

Management of an ectopically erupting permanent mandibular molar: a case report.  

PubMed

Ectopically erupting permanent first molars occur in approximately 3% to 4% of children, and presentation in the mandible is very rare. When the malocclusion warrants a nonextraction treatment plan in the mandible, early correction of an impacted ectopic molar with space regaining is appropriate. The purpose of this case report was to describe and document the correction of a severely impacted permanent mandibular left first molar in the early mixed dentition along with long-term results. A bilateral lingual arch was placed on the primary mandibular second molars with a Halterman-type extension in conjunction with a bonded button on the occlusal surface of the impacted permanent molar and chain elastic Early space regaining allowed future nonextraction treatment. PMID:18402102

Kennedy, David B

2008-01-01

378

Endoscopic treatment of mandibular condylar fractures in live minipigs: benefits of the operative learning curve.  

PubMed

Endoscopic treatment of mandibular condyle fractures is a minimally invasive technique that avoids the complications of open reduction and internal fixation. We have used live minipigs as an animal model for learning and training the technique. Fourteen condylar fractures were created, reduced, and internally plated in 7 minipigs using an endoscopic approach by a surgeon with no previous experience of the technique. The mandibles were reduced and fixed successfully in each animal. Operating time was reduced as the surgeon became more familiar with the technique. Minipigs are useful as a model for the endoscopic approach to the treatment of mandibular condylar fractures. Surgeons have the opportunity to train and gain surgical endoscopic experience before treating patients. PMID:23246351

Foletti, Jean-Marc; Bruneau, Stéphane; Meningaud, Jean-Paul; Berdah, Stéphane V; Guyot, Laurent

2013-10-01

379

Management of obstructive sleep apnea in an edentulous lower jaw patient with a mandibular advancement device.  

PubMed

Obstructive sleep apnea (OSA) is the most common sleep-related breathing disorder with periodic reduction or cessation of airflow during sleep. It is associated with loud snoring, disrupted sleep, and witnessed apneas. Treatment of OSA varies from simple measures such as oral appliances and nasal continuous positive airway pressure (CPAP) to surgical procedures like uvulopalatopharyngoplasty and tracheostomy. Oral appliances are a viable nonsurgical treatment alternative in patients with OSA, of which mandibular advancement devices are most common. Edentulism which contributes to the worsening of OSA reduces the number of available therapeutic strategies and is considered a contraindication to oral appliance therapy. This clinical report describes the treatment of a 63-year-old edentulous OSA patient for whom a mandibular advancement device was designed. PMID:24551463

Keyf, Filiz; Ciftci, Bülent; F?rat Güven, Selma

2014-01-01

380

Management of Obstructive Sleep Apnea in an Edentulous Lower Jaw Patient with a Mandibular Advancement Device  

PubMed Central

Obstructive sleep apnea (OSA) is the most common sleep-related breathing disorder with periodic reduction or cessation of airflow during sleep. It is associated with loud snoring, disrupted sleep, and witnessed apneas. Treatment of OSA varies from simple measures such as oral appliances and nasal continuous positive airway pressure (CPAP) to surgical procedures like uvulopalatopharyngoplasty and tracheostomy. Oral appliances are a viable nonsurgical treatment alternative in patients with OSA, of which mandibular advancement devices are most common. Edentulism which contributes to the worsening of OSA reduces the number of available therapeutic strategies and is considered a contraindication to oral appliance therapy. This clinical report describes the treatment of a 63-year-old edentulous OSA patient for whom a mandibular advancement device was designed. PMID:24551463

Keyf, Filiz; Ciftci, Bulent; F?rat Guven, Selma

2014-01-01

381

Orthodontic treatment combined with tooth transplantation for an adult patient with a missing mandibular first molar: long-term follow-up.  

PubMed

A Japanese woman, age 29 years 8 months, had a missing mandibular left first molar, bimaxillary dentoalveolar protrusion, and crowding. She had a skeletal Class II relationship and a long face with a steep mandible. She had previously undergone root canal treatment for the mandibular right second premolar, and the mandibular left third molar was impacted. The maxillary left first premolar was extracted for autotransplantation to the mandibular left first molar region. After confirmation of a favorable prognosis for the transplanted tooth, the maxillary right first premolar, the mandibular right second premolar, and the impacted mandibular left third molar were extracted for orthodontic treatment. The active orthodontic treatment period was 32 months. The patient returned for follow-up records 12 years 7 months after the active treatment, and her facial profile and occlusion were well maintained. At 13 years 9 months after transplantation, no abnormalities were observed with the transplanted tooth in the radiographic and clinical evaluations. PMID:24680019

Watanabe, Yohei; Mohri, Tamaki; Yoshida, Rumi; Yamaki, Masaki; Saito, Isao

2014-04-01

382

Technique of mandibular salivary gland biopsy in river otters (Lutra canadensis).  

PubMed

A Franklin-Silverman biopsy needle was used to obtain 2-5- x 1-2-mm mandibular salivary gland tissue samples percutaneously from nine North American river otters (Lutra canadensis). The samples were suitable for fluorescent antibody or polymerase chain reaction rabies testing. Ninety-two percent (11/12) of the biopsy procedures yielded histologically confirmed salivary gland tissue, and the remaining biopsy yielded adipose tissue. No complications were noted after 5-21 days. PMID:10484141

Tocidlowski, M E; Harms, C A; Sumner, P W; Stoskopf, M K

1999-06-01

383

Maxillary esthetics, mandibular function: a rationale for predictable treatment of the moderately worn dentition.  

PubMed

An older patient presented with concerns about tooth wear. A treatment plan driven by the dominant risk factors of esthetics and function was preceded by a comprehensive evaluation to determine the etiology of the moderately worn dentition. Treatment goals included lengthening maxillary teeth, leveling the posterior occlusal planes, opening the vertical dimension of occlusion, and establishing bilateral simultaneous posterior occlusion. Esthetic parameters were established with the maxillary arch, enabling the functional goals to be addressed with treatment in the mandibular arch. PMID:25199031

Hermanides, Leon; Larson, Kim

2014-09-01

384

An Unusual Case of Bilateral Maxillary and Mandibular Para Premolar: A Case Report  

PubMed Central

The presence of supernumerary teeth is not uncommon in the general population. They occur more frequently in patients with a family history of such teeth. It is rare to find multiple supernumeraries in individuals with no other associated disease or syndrome. There have been very few documented cases of bilateral maxillary and mandibular supernumeraries in the premolar region. An unusual case of a 35-year-old man with six para premolars and complete dentition is presented. PMID:24396358

Chanagay, Sunil Kumar Vishwanath; Singh, Vikram; Bantwal, Sunil Rao; Muniyappa, Manjunatha

2013-01-01

385

External Mandibular Distraction in Unusual Pediatric Syndromes with Micrognathia and Airway Obstruction  

Microsoft Academic Search

Mandibular hypoplasia is a craniofacial malformation that can cause airway obstruction and may affect the eating process.\\u000a This anomaly is common in many polimalformed Syndromes, including the Pierre Robin Sequence and the Moebius Syndrome. It is\\u000a also common in cases related to the dysgenesis of the brainstem. In order to avoid tracheostomy, or to allow for early decannulation\\u000a in severely

Ricardo Horta Oliveira; Marisa Marques; José Manuel Amarante; Álvaro Silva

386

Improvements in smoothness of chewing cycles in adults with mandibular prognathism after surgery: a longitudinal study.  

PubMed

Although adults with mandibular prognathism are known to show impaired smoothness of masticatory jaw movements, it remains uncertain whether/how the surgical-orthodontic treatment is effective to improve masticatory jaw movements. The aims of this study were (i) to verify whether the surgical-orthodontic treatment of patients with mandibular prognathism improve smoothness of the chewing jaw movements post-operatively and, if so, (ii) to examine whether the improved parameters show similar quantities as those of the control subjects. The chewing jaw movements for 13 patients with mandibular prognathism were recorded at pre- and post-treatment stages. The patient group was divided into two groups: Class III(closed) showed full occlusal contact at the habitual intercuspal position, whereas Class III(open) showed inability of occlusal contact between the upper and lower anterior teeth. The control group (CG) consisted of 52 subjects having acceptably good occlusion. The normalised jerk cost (NJC), movement duration and peak velocity in jaw closing were compared. For both Class III(open) and Class III(closed) groups, statistical comparisons revealed that the NJC and movement duration were decreased after the treatment, whereas the peak velocity was increased (all P < 0·01). For the Class III(open), these quantities at the post-treatment stage did not show any significant differences compared with those for the CG. It is concluded that the smoothness of chewing jaw movements for patient with mandibular prognathism were improved after treatment, and for the patients with anterior open bite at pre-treatment, the post-operatively achieved smoothness of jaw-closing movements did not differ from those of the CG. PMID:23496087

Yashiro, K; Takada, K

2013-06-01

387

The evolution of breast implants.  

PubMed

Breast augmentation remains one of the most common aesthetic procedures performed in the United States. Silicone implants have undergone an evolution with the availability of both fourth- and fifth-generation devices from the 3 leading manufacturers in the United States. This article explores the evolution of breast implants with special emphasis on the advancement of the silicone implants. Clinicians should strive to provide ongoing data and sound science to continue to improve clinical outcomes in the future. PMID:25057743

Maxwell, G Patrick; Gabriel, Allen

2014-07-01

388

Endometrium implantation and ectopic pregnancy  

Microsoft Academic Search

Embryo in uterine implantation is a complex and multifactor-related process and is a downstream and ideal point for woman\\u000a fertility control. Understanding the cellular and molecular mechanism of implantation is a prerequisite for development of\\u000a anti-implantation contraceptives. In spite of considerable accumulation of information from the laboratory animals that has\\u000a been achieved, it is difficult to generate such information in

Liu Yixun

2004-01-01

389

Comparison of Mandibular Phenotypic and Genetic Integration between Baboon and Mouse  

PubMed Central

In this study we compare patterns of mandibular integration between mice and baboons using both phenotypic and quantitative genetic data. Specifically, we test how well each species fits with the mosaic model of mandibular integration suggested by Atchley and Hall (Biol Rev Camb Philos Soc 66:101–157, 1991) based on developmental modules. We hypothesize that patterns of integration will be similar for mice and baboons and that both species will show strong integration within developmental modules and weaker integration between modules. Corresponding landmark data were collected from the hemi-mandibles of an advanced intercross mouse sample (N = 1239) and mandibles from a baboon sample of known pedigree from the Southwest Foundation for Biomedical Research (N = 430). We used four methods of analysis to quantify and compare the degree of mandibular integration between species including two methods based on a priori assumptions, and two a posteriori analyses. We found that patterns of integration are broadly similar for baboon and mouse mandibles, with both species displaying a modular pattern of integration. While there is a general trend of similarity in integration patterns between species, there were some marked differences. Mice are strongly correlated among distances within the coronoid process and the incisive alveolar region, whereas baboons are strongly integrated within the condylar process. We discuss the potential evolutionary implications of the similar patterns of integration between these species with an emphasis on the role of modularity. PMID:22212926

Roseman, Charles C.; Rogers, Jeffrey; Cheverud, James M.; Richtsmeier, Joan T.

2011-01-01

390

Combined orthodontic and surgical treatment of severe mandibular laterognathie with bimaxillary protrusion: case report.  

PubMed

This article summarizes the treatment progress for a patient with a severe dolichofacial pattern with a convex profile, severe lip incompetency, and concomitant mouth breathing. Her maxillary occlusal plane had a cant and the maxillary and mandibular midlines were shifted 2 and 4 mm to the left side, respectively. The treatment plan summary was as follows: (1) maxillary rapid expansion for the elimination of maxillary constriction; (2) extraction of maxillary right first molar; (3) extraction of mandibular first premolars; (4) preoperative orthodontic treatment to correct dental protrusions; (5) surgical repositioning of the maxilla and mandible; and (6) postoperative orthodontic treatment and retention. Orthodontic treatment lasted a total of 28 months, with a good intercuspation and significantly improved facial esthetics at the end of treatment. The 1-year postretention lateral cephalometric measurements did not indicate any significant relapse. Dental protrusion and crowding in both jaws were eliminated. Facial and dental asymmetry was resolved and the profile was improved. The cant of the occlusal plane and the lips were corrected. Evaluation of pre- and posttreatment profiles revealed a decrease in convexity. Dentally, Class I canine and Class III molar relationships were present at the end of the treatment. Maxillary and mandibular incisors were uprighted, improving the interincisal angle and the bite relationship. PMID:17373226

Sayinsu, Korkmaz; Isik, Fulya

2007-01-01

391

Efficacy of Bilateral Mental Nerve Block with Bupivacaine for Postoperative Pain Control in Mandibular Parasymphysis Fractures  

PubMed Central

Background and aims. Postoperative pain control is extremely important for both patients and surgeons; in this context, long-acting local anesthesia can play an important role after open reduction of maxillofacial fractures. The purpose of this study was to evaluate the effect of bilateral mental nerve block with bupivacaine on postoperative pain control in mandibular symphyseal fractures. Materials and methods. Fifty patients with pure mandibular symphyseal fractures were studied in two control and study groups. In contrast to the control group, the study group received bilateral mental nerve block with bupivacaine postoperatively. Patients were examined in relation to pain severity and opioid analgesic drug need sequences. Results. The study group needed significantly less opioid than the control group (P<0.01, U=141). The control and study groups were different in first opioid administration time. The control and study groups received first opioid dose in 0-2 and 2-4 hours, respectively. Conclusion. Bilateral mental nerve blocks with bupivacaine can reduce opioid analgesic need and it has a positive effect on postoperative pain control in mandibular symphyseal fractures. PMID:25346837

Mesgarzadeh, Ali Hossein; Afsari, Hosein; Pourkhamne, Sohrab; Shahamfar, Mohamadreza

2014-01-01

392

Application of Crestal Anesthesia for Treatment of Class I Caries in Posterior Mandibular Teeth  

PubMed Central

Background and aims Current infiltration techniques for achieving anesthesia in dental procedures are not applicable in posterior mandibular region because of its dense cortical bone. The aim of this study was to evaluate the efficacy of a specific infiltration anesthesia in posterior mandibular teeth instead of inferior alveolar nerve block for restorative procedures. Materials and methods Crestal anesthesia (CA) was assessed both clinically and by computed tomography scan for its efficacy and side effects. A combination of an opaque material (Ultravist) and 2% lidocaine was used to trace the anesthetic solution. The combination was primarily injected in the gingival tissue of rabbit and was followed-up regularly for two weeks to assess any possible injury. After confirming its safety, a combination of these materials was injected to volunteers to assess efficacy and diffusion route. A total of 154 patients (77 female, 77 male) with matched bilateral posterior teeth in mandible were selected randomly and an IANB and CA were performed randomly and separately in different sessions for the contra lateral teeth. The onset of anesthesia, anesthesia duration, pain, blood pressure, pulse rate, and consumed volume of anesthetic solution was recorded for each technique. Data were analyzed using paired t-test. Results There were no significant differences in clinical attachment loss, pocket depth, bone level, plaque index, and free gingival margin between the two flaps (p>0.05). Conclusion CA could be considered as a reliable and safe primary injection in posterior mandibular teeth for restorative treatments. PMID:23019502

Taheri Talesh, Koroush; Solahaye Kahnamouii, Shiva

2011-01-01

393

Endoscope-assisted conservative condylectomy combined with orthognathic surgery in the treatment of mandibular condylar osteochondroma.  

PubMed

Mandibular condylar osteochondroma (OC) results in asymmetric prognathism with facial morphologic and functional disturbance. The aim of this study was to explore the feasibility of endoscope-assisted conservative condylectomy combined with simultaneous orthognathic surgery in the treatment of condylar OC. Thirteen patients with OC of the mandibular condyle were enrolled in this study. With the aid of endoscope, condylar OC resection and conservative condylectomy were carried out via intraoral approach. A direct vision of the magnified and illuminated operative field was realized. Simultaneous orthognathic surgery was used to correct facial asymmetry and malocclusion. All patients healed uneventfully. No facial nerve injury and salivary fistula occurred. Facial symmetry and morphology were greatly improved, and stable occlusion was obtained in all cases. The patients showed no signs of recurrence and temporomandibular joint ankylosis in the 16 to 54 months of follow-up. Endoscope-assisted tumor resection and condylectomy combined with simultaneous orthognathic surgery provide us a valuable option in the treatment of mandibular condylar OC. PMID:24905948

Yu, Hongbo; Jiao, Feifei; Li, Biao; Zhang, Lei; Shen, Steve Guofang; Wang, Xudong

2014-07-01

394

Prospective tomographic evaluation of autogenous bone resorption harvested from mandibular ramus in atrophic maxilla.  

PubMed

Autogenous bone is considered the criterion standard for grafting procedures of severely resorbed alveolar ridges. However, the rate of autogenous graft resorption remains controversial. The aim of this study was to evaluate the mandibular graft resorption with cone beam computed tomography after 10 and 180 days of augmentation procedures in the atrophic maxilla. Twenty-two patients received 36 autogenous bone grafts harvested from the mandibular ramus. Tomographical evaluations were carried out after 10 (T1) and 180 (T2) days of augmentation procedures to obtain bone grafts area measurements. After 10 days postoperatively (T1), the mean area of bone graft was 81.38 mm (range, 46.33-113.73 mm), whereas, after 180 days postoperatively (T2), the mean area of bone graft was 66.13 mm (range, 33.51-101.93 mm). The mean percentage variation of graft resorption between T1 and T2 was 18.38%. Autogenous bone blocks harvested from the mandibular ramus presented a reduction of 18.38% in the measurement areas after the augmentation procedures in the atrophic maxilla. Therefore, the use of autogenous bone blocks remains as a viable and predictable procedure for the rehabilitation of the atrophic maxillae. Thus, other studies must be carried out to improve the knowledge on the bone graft resorption, which may serve as a basis for the development of more effective strategies for the rehabilitation of patients with an atrophic maxilla. PMID:25364976

Alérico, Francisco Antoninho; Bernardes, Sérgio Rocha; Fontão, Flávia Noemy Gasparini Kiatake; Diez, Gustavo Fornari; Alérico, João Henrique Scotti; Claudino, Marcela

2014-11-01

395

Mineralization of mandibular third molars can estimate chronological age--Brazilian indices.  

PubMed

Forensic age estimation is an important element of anthropological research, as it produces one of the primary sources of data that researchers use to establish the identity of a person living or the identity of unknown bodily remains. The aim of this study was to determine if the chronology of third molar mineralization could be an accurate indicator of estimated age in a sample Brazilian population. If so, mineralization could determine the probability of an individual being 18 years or older. The study evaluated 407 panoramic radiographs of males and females from the past 5 years in order to assess the mineralization status of the mandibular third molars. The evaluation was carried out using an adaptation of Demirjian's system. The results indicated a strong correlation between chronological age and the mineralization of the mandibular third molars. The results indicated that modern Brazilian generation tends to demonstrate an earlier mandibular third molar mineralization than older Brazilian generation and people of other nationalities. Males reached developmental stages slightly earlier than females, but statistically significant differences between the sex were not found. The probability that an individual with third molar mineralization stage H had reached an age of 18 years or older was 96.8-98.6% for males and females, respectively. PMID:22257966

de Oliveira, Fernando Toledo; Capelozza, Ana Lúcia Álvares; Lauris, José Roberto Pereira; de Bullen, Izabel Regina Fischer Rubira

2012-06-10

396

Comparative evaluation of the mandibular distraction zone using ultrasonography and conventional radiography.  

PubMed

The purpose of this study was to determine the efficacy of ultrasonography (USG) for the evaluation of bone formation in the mandibular distraction wound and to compare this with radiographic evaluation, which is currently the standard modality. Twenty-two patients underwent mandibular distraction (30 sides) with a variety of distraction devices. The wounds were assessed with plain radiographs and USG at established time intervals. Estimates of bone formation using a semiquantitative bone fill score were made for radiographs and USG. USG bone fill scores were correlated with radiography scores. At week 4 the difference between the scores was statistically significant (P=0.01); at all other time points, USG and radiography scores were comparable. At week 4, USG scores were significantly higher than the corresponding radiography scores, indicating that USG is an earlier indicator of calcification in the distraction zone as compared to radiography. USG evaluation of the distraction osteogenesis (DO) zone has many inherent advantages over conventional methods. The results of this study indicate that USG is an accurate non-invasive technique that may prove to be useful in assessing the mandibular DO regenerate in patients. PMID:24393569

Issar, Y; Sahoo, N K; Sinha, R; Satija, L; Chattopadhyay, P K

2014-05-01

397

Tracheostomy versus mandibular distraction osteogenesis in infants with Robin sequence: a comparative cost analysis.  

PubMed

Many treatments have been described for infants with Robin sequence and severe respiratory distress, but there have not been many comparative studies of outcome and cost-effectiveness. The aim of this study was to compare the cost and complications of two common interventions - mandibular distraction osteogenesis and tracheostomy. Nine patients with isolated Robin sequence (mandibular distraction osteogenesis, n=5, and tracheostomy, n=4) were included in the analyses. Predetermined costs and complications were obtained retrospectively from medical records and by questionnaires to the parents over a 12-month period. Overall direct costs (admission to hospital, diagnostics, surgery, and homecare) were 3 times higher for tracheostomy (€105.523 compared with €33.482, p=0.02). Overall indirect costs (absence from work) were almost 5 times higher (€2.543 compared with €543, p=0.02). There was a threefold increase in overall total cost/patient (both direct and indirect) for tracheostomy (€108.057 compared with 34.016, p=0.02) and 4 times more complications were encountered. This study shows that mandibular distraction osteogenesis in infants diagnosed with Robin sequence costs significantly less and results in fewer complications than tracheostomy, and this contributes to our current knowledge about the ideal approach for infants with Robin sequence and might provide a basis for institutional protocols in the future. PMID:24388657

Paes, Emma C; Fouché, James J; Muradin, Marvick S M; Speleman, Lucienne; Kon, Moshe; Breugem, Corstiaan C

2014-03-01

398

Prevalence of Three-Rooted Mandibular First Molars among Indians Using SCT  

PubMed Central

Undetected extra roots or root canals are a major reason for failure of endodontic treatment. Failure to recognize an extra distolingual (DL) root in mandibular first molar may lead to incomplete debridement of the root canal system and eventually treatment failure. Therefore, it is crucial that atypical anatomy is identified before and during dental treatment. Spiral computed tomography (SCT) images can show 3D images, and therefore much detail can be used when traditional methods prevent adequate endodontic treatment. The overall incidence of DL roots on the mandibular first molars was 6.40% for all patients and 5.00% for all teeth, respectively. The occurrence of DL roots on the right side and on the left side showed a statistically significant difference. The bilateral incidence of symmetrical distribution of DL roots was 56.25%. The DL root canal orifice was separated from DB canal orifice by 2.79 ± 0.34?mm, from the MB canal orifice by 4.23 ± 0.81?mm, and from the ML canal orifice by 3.29 ± 0.52?mm. The high prevalence of the DL root in permanent mandibular first molars among the Indian population by using SCT and estimations of the interorifice distance of such teeth might be useful for successful endodontic treatments. PMID:23840212

Garg, Amit Kumar; Tewari, Rajendra Kumar; Agrawal, Neha

2013-01-01

399

Interrami intraoral fixation technique for severe mandibular rifle fragmented bullet injury management.  

PubMed

Interrami intraoral Kirschner wire fixation technique is presented for the reduction, stabilization, and immobilization of a pulverized and avulsed lower jaw caused by rifle fragmented bullet injuries. This indirect mandibular war injury fixation technique was tolerated by the patients and tissue more than any indirect external fixation. In addition, it is easier than open reduction using large bone plates for disrupted ballistics mandibular injury defects. An interrami intraoral fixation is appropriate for severely disrupted mandibular hard and soft tissues, and has been adapted in cases of mass casualties and limited resources. Benefits of use include limited hospital beds and fewer follow-up visits. Rifle fragmented bullet injuries need more attention for several reasons: not only because of the higher mortality and devastating nature of the injuries, but also because these injuries are responsible for an unreported type of bullet biomechanism wounding in the craniofacial region. In turn, this necessitates specialized victim management. The survival rates depend on immediate proper execution of airway, breathing, and circulation, which become more complicated as it relates to airway compromise and oropharyngeal hemorrhage resuscitation. Survival is predicated on the implementation of feasible, sensible, life-saving techniques that are applied at the appropriate time. PMID:23851763

Shuker, Sabri T

2013-07-01

400

Automated scheme for measuring mandibular cortical thickness on dental panoramic radiographs for osteoporosis screening  

NASA Astrophysics Data System (ADS)

Findings of dental panoramic radiographs (DPRs) have shown that the mandibular cortical thickness (MCT) was significantly correlated with osteoporosis. Identifying asymptomatic patients with osteoporosis through dental examinations may bring a supplemental benefit for the patients. However, most of the DPRs are used for only diagnosing dental conditions by dentists in their routine clinical work. The aim of this study was to develop a computeraided diagnosis scheme that automatically measures MCT to assist dentists in screening osteoporosis. First, the inferior border of mandibular bone was detected by use of an active contour method. Second, the locations of mental foramina were estimated on the basis of the inferior border of mandibular bone. Finally, MCT was measured on the basis of the grayscale profile analysis. One hundred DPRs were used to evaluate our proposed scheme. Experimental results showed that the sensitivity and specificity for identifying osteoporotic patients were 92.6 % and 100 %, respectively. We conducted multiclinic trials, in which 223 cases have been obtained and processed in about a month. Our scheme succeeded in detecting all cases of suspected osteoporosis. Therefore, our scheme may have a potential to identify osteoporotic patients at an early stage.

Matsumoto, T.; Hayashi, T.; Hara, T.; Katsumata, A.; Muramatsu, C.; Zhou, X.; Iida, Y.; Matsuoka, M.; Katagi, Ki.; Fujita, H.

2012-03-01

401

Distinct Characteristics of Mandibular Bone Collagen Relative to Long Bone Collagen: Relevance to Clinical Dentistry  

PubMed Central

Bone undergoes constant remodeling throughout life. The cellular and biochemical mechanisms of bone remodeling vary in a region-specific manner. There are a number of notable differences between the mandible and long bones, including developmental origin, osteogenic potential of mesenchymal stem cells, and the rate of bone turnover. Collagen, the most abundant matrix protein in bone, is responsible for determining the relative strength of particular bones. Posttranslational modifications of collagen, such as intermolecular crosslinking and lysine hydroxylation, are the most essential determinants of bone strength, although the amount of collagen is also important. In comparison to long bones, the mandible has greater collagen content, a lower amount of mature crosslinks, and a lower extent of lysine hydroxylation. The great abundance of immature crosslinks in mandibular collagen suggests that there is a lower rate of cross-link maturation. This means that mandibular collagen is relatively immature and thus more readily undergoes degradation and turnover. The greater rate of remodeling in mandibular collagen likely renders more flexibility to the bone and leaves it more suited to constant exercise. As reviewed here, it is important in clinical dentistry to understand the distinctive features of the bones of the jaw. PMID:24818151

Tokutomi, Kentaro; Sasaki, Michiko; Katafuchi, Michitsuna; Mizumachi, Emiri; Sato, Hironobu

2014-01-01

402

Spiral Computed Tomographic Evaluation and Endodontic Management of a Mandibular Second Molar with Four Roots. A Case Report and Literature Review  

PubMed Central

The vast majority of mandibular second molars have two roots with three root canals; however, variations in molar root canal anatomy are not uncommon. To the best of our knowledge, four rooted mandibular second molar with three mesial roots and one distal root has never been reported. Herein, we present the endodontic management of a four rooted mandibular second molar tooth, diagnosed with the assistance of spiral computed tomography (SCT) with a brief review of literature. PMID:23717333

Purra, Aamir Rashid; Mushtaq, Mubashir; Robbani, Irfan; Farooq, Riyaz

2013-01-01

403

Immediate Direct-To-Implant Breast Reconstruction Using Anatomical Implants  

PubMed Central

Background In 2012, a new anatomic breast implant of form-stable silicone gel was introduced onto the Korean market. The intended use of this implant is in the area of aesthetic breast surgery, and many reports are promising. Thus far, however, there have been no reports on the use of this implant for breast reconstruction in Korea. We used this breast implant in breast reconstruction surgery and report our early experience. Methods From November 2012 to April 2013, the Natrelle Style 410 form-stable anatomically shaped cohesive silicone gel-filled breast implant was used in 31 breasts of 30 patients for implant breast reconstruction with an acellular dermal matrix. Patients were treated with skin-sparing mastectomies followed by immediate breast reconstruction. Results The mean breast resection volume was 240 mL (range, 83-540 mL). The mean size of the breast implants was 217 mL (range, 125-395 mL). Breast shape outcomes were considered acceptable. Infection and skin thinning occurred in one patient each, and hematoma and seroma did not occur. Three cases of wound dehiscence occurred, one requiring surgical intervention, while the others healed with conservative treatment in one month. Rippling did not occur. So far, complications such as capsular contracture and malrotation of breast implant have not yet arisen. Conclusions By using anatomic breast implants in breast reconstruction, we achieved satisfactory results with aesthetics better than those obtained with round breast implants. Therefore, we concluded that the anatomical implant is suitable for breast reconstruction. PMID:25276645

Kim, Sung-Eun; Jung, Dong-Woo; Chung, Kyu-Jin; Kim, Tae Gon; Kim, Yong-Ha; Lee, Soo Jung; Kang, Su Hwan; Choi, Jung Eun

2014-01-01

404

MicroRNA and implantation.  

PubMed

We provide a review of microRNA (miRNA) related to human implantation which shows the potential diagnostic role of miRNAs in impaired endometrial receptivity, altered embryo development, implantation failure after assisted reproduction technology, and in ectopic pregnancy and pregnancies of unknown location. MicroRNAs may be emerging diagnostic markers and potential therapeutic tools for understanding implantation disorders. However, further research is needed before miRNAs can be used in clinical practice for identifying and treating implantation failure. PMID:24882617

Galliano, Daniela; Pellicer, Antonio

2014-06-01

405

Short implants: A systematic review  

PubMed Central

Background: Short implants are manufactured for use in atrophic regions of the jaws. Although many studies report on short implants as ?10 mm length with considerable success, the literature regarding survival rate of ?7 mm is sparse. Purpose: The purpose of this study was to systematically evaluate the publications concerning short dental implants defined as an implant with a length of ?7 mm placed in the maxilla or in the mandible. Materials and Methods: A Medline and manual search was conducted to identify studies concerning short dental implants of length ?7 mm published between 1991 and 2011. The articles included in this study report data on implant length ?7 mm, such as demographic variables, implant type, location in jaws, observation time, prostheses and complications. Results: The 28 included studies represent one randomized controlled trial, 12 prospective studies and 10 retrospective studies. The survival rate of short implant was found to be increased from 80% to 90% gradually, with recent articles showing 100%. Conclusion: When severe atrophy of jaws was encountered, short and wide implants can be placed successfully. PMID:23162320

Karthikeyan, I.; Desai, Shrikar R.; Singh, Rika

2012-01-01

406

Implantable medical devices MRI safe.  

PubMed

Pacemakers, ICDs, neurostimulators like deep brain stimulator electrodes, spiral cord stimulators, insulin pumps, cochlear implants, retinal implants, hearing aids, electro cardio gram (ECG) leads, or devices in interventional MRI such as vascular guide wires or catheters are affected by MRI magnetic and electromagnetic fields. Design of MRI Safe medical devices requires computer modeling, bench testing, phantom testing, and animal studies. Implanted medical devices can be MRI unsafe, MRI conditional or MRI safe (see glossary). In the following paragraphs we will investigate how to design implanted medical devices MRI safe. PMID:23739365

Dal Molin, Renzo; Hecker, Bertrand

2013-01-01

407

Strain Distribution in a Kennedy Class I Implant Assisted Removable Partial Denture under Various Loading Conditions  

PubMed Central

Purpose. This in vitro study investigates how unilateral and bilateral occlusal loads are transferred to an implant assisted removable partial denture (IARPD). Materials and Methods. A duplicate model of a Kennedy class I edentulous mandibular arch was made and then a conventional removable partial denture (RPD) fabricated. Two Straumann implants were placed in the second molar region, and the prosthesis was modified to accommodate implant retained ball attachments. Strain gages were incorporated into the fitting surface of both the framework and acrylic to measure microstrain (?Strain). The IARPD was loaded to 120Ns unilaterally and bilaterally in three different loading positions. Statistical analysis was carried out using SPSS version 18.0 (SPSS, Inc., Chicago, IL, USA) with an alpha level of 0.05 to compare the maximum ?Strain values of the different loading conditions. Results. During unilateral and bilateral loading the maximum ?Strain was predominantly observed in a buccal direction. As the load was moved anteriorly the ?Strain increased in the mesial area. Unilateral loading resulted in a twisting of the structure and generated a strain mismatch between the metal and acrylic surfaces. Conclusions. Unilateral loading created lateral and vertical displacement of the IARPD. The curvature of the dental arch resulted in a twisting action which intensified as the unilateral load was moved anteriorly. PMID:23737788

Shahmiri, Reza; Aarts, John M.; Bennani, Vincent; Swain, Michael V.

2013-01-01

408

Mastication and jaw motion of partially edentulous patients are affected by different implant-based prostheses.  

PubMed

The main goal of prosthetic treatment is to restore masticatory function. However, insufficient evidence supports the recommendation of one specific prosthetic intervention for partially edentulous patients. Function after the use of three different prostheses by the same partially edentulous subject. Mastication was assessed in 12 subjects (mean age 62.6 ± 7.8 years) after they had used removable partial dentures (RPDs), implant-supported partial dentures (IRPDs) and implant-fixed partial dentures (IFPDs). Masticatory ability (MA) was estimated by visual analogue scale questionnaire, while the mandibular chewing motion was evaluated by kinesiographic device, representing an objective measurement of masticatory function. Data were analysed by repeated-measures anova followed by Tukey-Kramer (P < 0.05). MA improved after IRPD and IFPD use (P < 0.05). Opening, closing and total cycle time duration were reduced after both IRPD and IFPD use (P < 0.05), irrespectively the implant prosthesis type. IFPDs and IRPDs restore the masticatory function of partially edentulous patients better than RPDs. PMID:24750471

Gonçalves, T M S V; Campos, C H; Rodrigues Garcia, R C M

2014-07-01

409

Chronological changes in the microstructure of bone during peri-implant healing: a microcomputed tomographic evaluation.  

PubMed

Our objectives were to examine the titanium-bone interfaces chronologically and to clarify the process of osseointegration using microcomputed tomography (microCT). The mandibular premolars of 3 dogs were extracted and 12 weeks later 2 Straumann dental implants were installed in each quadrant. The microstructural changes at the bone-implant interface at the first, fourth, and eighth weeks after installation were evaluated by microCT and a 3-dimensional image was constructed. The microstructural measurements at the bone-implant interface, including the trabecular number (Tb.N), bone volume fraction (BV/TV), structure model index (SMI), trabecular thickness (Tb.Th), trabecular separation (Tb.Sp) and connectivity density (Conn.D), were measured. Experimental outcomes were analysed for correlations between time and microstructural variables of trabecular bone. Tb.N increased significantly during the eighth week compared with that during the first and fourth week (p=0.001, 0.002). BV/TV increased generally with time and there were significant differences (p=0.003) between each time group. While Tb.Sp decreased with time and changed significantly during the eighth week compared with that during the first week (p=0.021), differences in SMI, Tb.Th and Conn.D did not differ significantly according to time of implant. The significant increase in the Tb.N and BV/TV during the eighth week after insertion of implants indicates that the formation of new bone before the eighth week is the key to osseointegration. PMID:25131999

Fang, Liang; Ding, Xi; Wang, Hui-Ming; Zhu, Xing-Hao

2014-11-01

410

Fibrovascularization and osteogenesis in high-density porous polyethylene implants.  

PubMed

High-density porous polyethylene (HDPP) has been extensively used in craniofacial reconstructions with high-level success and minimal complications. It is known for its biocompatibility and satisfactory stability in the receptor bone area, presenting only a few reports of mobility and infection. In the current study, attention was given to the interface area between HDPP and bone surface to analyze fibrous and bone tissue formation and ingrowth into the pores of the material placed in the mandible of rabbits. Twelve male New Zealand rabbits underwent surgical procedure to receive bilateral HDPP implants in buccal face of dentate mandibular alveolar process, fixed with titanium screws. After 7, 14, 45, and 90 days, the animals were killed, and the specimens were retrieved for histologic and immunohistochemical analyses. No implant loss or infection was detected at the retrieval of the specimens. The microscopic analysis presented satisfactory integration of the material to the bone surface, with new bone formation from the receptor bed and inside the pores of the material, observed from the 15th day. After 90 days, remodeling bone and fibrous tissue was seen in the interface region. Among some of the pores, mature lamellar bone was present. Immunohistochemistry pointed out a moderate expression either to Core binding factor protein 1/RUNX2 or to vascular endothelial growth factor for early periods evaluated, that is, 7 and 15 days after surgery. These results confirm the osteoconductive behavior and high biocompatibility of the material, associated to its adequate immobilization, leading to its lifelong presence in human biologic system. PMID:19553849

Oliveira, Renato Victor; de Souza Nunes, Leandro Soeiro; Filho, Hugo Nary; de Andrade Holgado, Leandro; Ribeiro, Daniel Araki; Matsumoto, Mariza Akemi

2009-07-01

411

Implantable medical sensor system  

DOEpatents

An implantable chemical sensor system for medical applications is described which permits selective recognition of an analyte using an expandable biocompatible sensor, such as a polymer, that undergoes a dimensional change in the presence of the analyte. The expandable polymer is incorporated into an electronic circuit component that changes its properties (e.g., frequency) when the polymer changes dimension. As the circuit changes its characteristics, an external interrogator transmits a signal transdermally to the transducer, and the concentration of the analyte is determined from the measured changes in the circuit. This invention may be used for minimally invasive monitoring of blood glucose levels in diabetic patients.

Darrow, Christopher B. (Pleasanton, CA); Satcher, Jr., Joe H. (Modesto, CA); Lane, Stephen M. (Oakland, CA); Lee, Abraham P. (Walnut Creek, CA); Wang, Amy W. (Berkeley, CA)

2001-01-01

412

[A Roman orbital implant?].  

PubMed

During an excavation in Regensburg/Germany the skeleton of an approximately 20-year-old Roman man was found who was buried in the 3rd/4th century after Christ. A "stone" was found which fitted into the left orbit precisely. After a thorough investigation of the "stone" and with the ophthalmohistorical literature in mind an orbital "implant" as well as a petrified medical paste ("Kollyrium") could be ruled out almost with certainty. Possibly the "stone" served another medical purpose or was used for protection of the eye. PMID:23011607

Rohrbach, J M; Harbeck, M; Holzhauser, P; Tekeva-Rohrbach, C I; Mach, M; Codreanu-Windauer, S

2012-11-01

413

An Unusual Bone Loss Around Implants  

PubMed Central

Pre-implant disease is an inflammatory process that affects the surrounding tissues of a functional osseointegrated implant. It is usually the result of a disequilibrium between the micro-flora and the defense system. This case reports a 57-year-old man with unusual bone loss around dental implants. This was an unusual case of peri-implantitis that occurred only in the implants on one side of the mouth although they were all unloaded implants. PMID:24396359

Rokn, Amir Reza; Sajedinejad, Neda; Yousefyfakhr, Hosnieh; Badri, Samare

2013-01-01

414

Bone regeneration by the osteoconductivity of porous titanium implants manufactured by selective laser melting: a histological and micro computed tomography study in the rabbit.  

PubMed

The treatment of large bone defects still poses a major challenge in orthopaedic and cranio-maxillofacial surgery. One possible solution could be the development of personalized porous titanium-based implants that are designed to meet all mechanical needs with a minimum amount of titanium and maximum osteopromotive properties so that it could be combined with growth factor-loaded hydrogels or cell constructs to realize advanced bone tissue engineering strategies. Such implants could prove useful for mandibular reconstruction, spinal fusion, the treatment of extended long bone defects, or to fill in gaps created on autograft harvesting. The aim of this study was to determine the mechanical properties and potential of bone formation of light weight implants generated by selective laser melting (SLM). We mainly focused on osteoconduction, as this is a key feature in bone healing and could serve as a back-up for osteoinduction and cell transplantation strategies. To that end, defined implants were produced by SLM, and their surfaces were left untreated, sandblasted, or sandblasted/acid etched. In vivo bone formation with the different implants was tested throughout calvarial defects in rabbits and compared with untreated defects. Analysis by micro computed tomography (?CT) and histomorphometry revealed that all generatively produced porous Ti structures were well osseointegrated into the surrounding bone. The histomorphometric analysis revealed that bone formation was significantly increased in all implant-treated groups compared with untreated defects and significantly increased in sand blasted implants compared with untreated ones. Bone bridging was significantly increased in sand blasted acid-etched scaffolds. Therefore, scaffolds manufactured by SLM should be surface treated. Bone augmentation beyond the original bone margins was only seen in implant-treated defects, indicating an osteoconductive potential of the implants that could be utilized clinically for bone augmentation purposes. Therefore, designed porous, lightweight structures have potential for bone regeneration and augmentation purposes, especially when complex and patient-specific geometries are essential. PMID:23895118

de Wild, Michael; Schumacher, Ralf; Mayer, Kyrill; Schkommodau, Erik; Thoma, Daniel; Bredell, Marius; Kruse Gujer, Astrid; Grätz, Klaus W; Weber, Franz E

2013-12-01

415

Sequential provisional implant prosthodontics therapy.  

PubMed

The fabrication and long-term use of first- and second-stage provisional implant prostheses is critical to create a favorable prognosis for function and esthetics of a fixed-implant supported prosthesis. The fixed metal and acrylic resin cemented first-stage prosthesis, as reviewed in Part I, is needed for prevention of adjacent and opposing tooth movement, pressure on the implant site as well as protection to avoid micromovement of the freshly placed implant body. The second-stage prosthesis, reviewed in Part II, should be used following implant uncovering and abutment installation. The patient wears this provisional prosthesis until maturation of the bone and healing of soft tissues. The second-stage provisional prosthesis is also a fail-safe mechanism for possible early implant failures and also can be used with late failures and/or for the necessity to repair the definitive prosthesis. In addition, the screw-retained provisional prosthesis is used if and when an implant requires removal or other implants are to be placed as in a sequential approach. The creation and use of both first- and second-stage provisional prostheses involve a restorative dentist, dental technician, surgeon, and patient to work as a team. If the dentist alone cannot do diagnosis and treatment planning, surgery, and laboratory techniques, he or she needs help by employing the expertise of a surgeon and a laboratory technician. This team approach is essential for optimum results. PMID:23220306

Zinner, Ira D; Markovits, Stanley; Jansen, Curtis E; Reid, Patrick E; Schnader, Yale E; Shapiro, Herbert J

2012-01-01

416

Changing Paradigms in Implant Dentistry  

Microsoft Academic Search

This review focuses on five paradigms of implant dentistry which have undergone considerable modifications in recent years. An attempt was made to select and include all the relevant citations of the past 10 years. These five paradigms document the debate in the clinical and scientific community and include the aspects of (1) smooth vs. rough implant surfaces, (2) submerged vs.

Giovanni E. Salvi; Niklaus P. Lang

2001-01-01

417

Porous metal for orthopedics implants  

PubMed Central

Summary Porous metal has been introduced to obtain biological fixation and improve longevity of orthopedic implants. The new generation of porous metal has intriguing characteristics that allows bone healing and high osteointegration of the metallic implants. This article gives an overview about biomaterials properties of the contemporary class of highly porous metals and about the clinical use in orthopaedic surgery. PMID:24133527

Matassi, Fabrizio; Botti, Alessandra; Sirleo, Luigi; Carulli, Christian; Innocenti, Massimo

2013-01-01

418

[Conservative femoral implants. Short stems].  

PubMed

Uncemented hip replacement matches the best results of classic cemented replacements. With the aim of preserving bone and soft tissue, implants with shorter stems and proximal metaphyseal support have been developed. Likewise, the lack of distal load should avoid cortical diaphyseal remodelling phenomena and the thigh pain of some cylindrical and wedge implants. The resurfacing implant, very popular as a conservative hip replacement in the young adult, has disadvantages associated with the fragility of the neck and with large head metal friction torque. Short stem hip replacement may be a reasonable alternative to classic implants and surface hip replacements. The different designs of conservative short stem implants are analysed, and are classified according to their morphology and biomechanical characteristics. Some medium term series show promising results. PMID:23177948

Valverde-Mordt, C; Valverde-Belda, D

2012-01-01

419

Temporomandibular disorders in patients with mandibular fractures: a preliminary comparative case-control study between South Australia and Oman.  

PubMed

The status of temporomandibular disorders (TMD) in subjects with previously treated mandibular fracture was evaluated in two centres: South Australia (SA) and Oman (O). TMD status was evaluated using Mandibular Function Impairment Questionnaire (MFIQ), Helkimo index for clinical dysfunction (HI), RDC/TMD and Wilkes' classification. Data were retrieved for adult patients treated for mandibular fracture over 3 years from January 2004 to December 2006. Thirty-six subjects participated from SA and 23 from O. Their results were compared with matched controls. The incidence of TMD symptoms in SA injured and control groups was higher compared with the O groups. There was statistically significant difference on all evaluation indices for SA injured subjects compared with controls (MFIQ/P 0.04, HI/P 0.0015, RDC/TMD/P 0.05, Wilkes classification/P 0.03). These TMD symptoms were clinically insignificant for most subjects and all were internal derangement of the temporomandibular joint (TMJ). There was no significant difference in all evaluation indices for O injured subjects compared with controls. For SA injured subjects who reported clinically significant TMD symptoms, assault and bilateral mandibular fractures were predominant features. The study shows that most mandibular injuries fully recover and the associated TMJ trauma usually has low clinical significance in the long term. PMID:21889312

Al-Hashmi, A; Al-Azri, A; Al-Ismaily, M; Goss, A N

2011-12-01

420

Evaluation of the potential of automatic segmentation of the mandibular canal using cone-beam computed tomography.  

PubMed

We aimed to investigate the effectiveness of software for automatically tracing the mandibular canal on data from cone-beam computed tomography (CT). After the data had been collected from one dentate and one edentate fresh cadaver head, both a trained Active Shape Model (ASM) and an Active Appearance Model (AAM) were used to automatically segment the canals from the mandibular to the mental foramen. Semiautomatic segmentation was also evaluated by providing the models with manual annotations of the foramina. To find out if the tracings were in accordance with the actual anatomy, we compared the position of the automatic mandibular canal segmentations, as displayed on cross-sectional cone-beam CT views, with histological sections of exactly the same region. The significance of differences between results were analysed with the help of Fisher's exact test and Pearson's correlation coefficient. When tracings based on AAM and ASM were used, differences between cone-beam CT and histological measurements varied up to 3.45mm and 4.44mm, respectively. Manual marking of the mandibular and mental foramina did not improve the results, and there were no significant differences (p=0.097) among the methods. The accuracy of automatic segmentation of the mandibular canal by the AAM and ASM methods is inadequate for use in clinical practice. PMID:25156043

Gerlach, Nicolaas Lucius; Meijer, Gerrit Jacobus; Kroon, Dirk-Jan; Bronkhorst, Ewald Maria; Bergé, Stefaan Jozef; Maal, Thomas Jan Jaap

2014-11-01