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1

Swallowed partial dentures  

PubMed Central

Swallowed or inhaled partial dentures can present a diagnostic challenge. Three new cases are described, one of them near-fatal because of vascular erosion and haemorrhage. The published work points to the importance of good design and proper maintenance. The key to early recognition is awareness of the hazard by denture-wearers, carers and clinicians. PMID:14749401

Hashmi, Syed; Walter, John; Smith, Wendy; Latis, Sergios

2004-01-01

2

Designing successful removable partial dentures.  

PubMed

In today's busy dental offices, removable partial denture design is often abdicated by dentists, both as a result of a lack of experience and consensus of design and because of educational failure on the part of dental schools. The result is delegation of the clinical design process to the lab technician. The lack of clinical data provided to the dental technician jeopardizes the quality of care. This article will focus on a logical and simple approach to this problem, making removable partial denture design simple and predictably achievable. The clinical evidence related to removable partial denture design will be described, along with a checklist to simplify the process and make it practical and applicable to everyday clinical practice. PMID:16553007

Daher, Tony; Hall, Dan; Goodacre, Charles J

2006-03-01

3

Candida pararugosa isolation from the oral cavity of an Italian denture wearer.  

PubMed

Candida pararugosa was first isolated from human feces, but after the initial description no further recovery from humans has been reported. During a study on oral Candida colonization in denture wearers living in Palermo (Italy), we isolated C. pararugosa from a 61-year-old woman without signs of oral candidosis. This constitutes, to the authors' knowledge, the first isolation of C. pararugosa from the oral cavity. After six months, colonization by C. pararugosa persisted, suggesting that this species could be a component of the normal oral microbiota. The identification procedure we used could be useful in elucidating the epidemiology of C. pararugosa and for establishing its clinical significance. PMID:15313258

Giammanco, Giovanni M; Melilli, Dario; Pizzo, Giuseppe

2004-09-01

4

Clinical and antimicrobial efficacy of NitrAdineTM-based disinfecting cleaning tablets in complete denture wearers  

PubMed Central

Objective This study evaluated the efficacy of NitrAdineTM-based disinfecting cleaning tablets for complete denture, in terms of denture biofilm removal and antimicrobial action. Material and methods Forty complete denture wearers (14 men and 26 women) with a mean age of 62.3±9.0 years were randomly assigned to two groups and were instructed to clean their dentures according to two methods: brushing (control) - 3 times a day with denture brush and tap water following meals; brushing and immersion (experimental) - brushing the denture 3 times a day with denture brush and tap water following meals and immersion of the denture in NitrAdineTM-based denture tablets (Medical InterporousTM). Each method was used for 21 days. Denture biofilm was disclosed by a 1% neutral red solution and quantified by means of digital photos taken from the internal surface before and after the use of the product. Microbiological assessment was conducted to quantify Candida sp. Results An independent t-test revealed a significant lower biofilm percentage for the experimental group (4.7, 95% CI 2.4 to 7.9) in comparison with the control group (mean 37.5, 95% CI 28.2 to 48.1) (t38=7.996, p<0.001). A significant reduction of yeast colony forming units could be found after treatment with Medical InterporousTM denture tablets as compared to the control group (Mann-Whitney test, Z=1.90; p<0.05). Conclusion The present findings suggest that NitrAdineTM-based disinfecting cleaning tablets are efficient in removal of denture biofilm. In addition, a clear antimicrobial action was demonstrated. Therefore, they should be recommended as a routine denture maintenance method for the prevention of the development of microbial biofilm-induced denture stomatitis. PMID:21308285

SILVA-LOVATO, Claudia Helena; DE WEVER, Bart; ADRIAENS, Els; PARANHOS, Helena de Freitas Oliveira; WATANABE, Evandro; PISANI, Maria Xavier; de SOUZA, Rafael Freitas; ITO, Isabel Yoko

2010-01-01

5

Prevalence and the relationship of oral mucosal lesions in tobacco users and denture wearers in the North Indian population  

PubMed Central

Aim: The aim of the present study was to determine the prevalence and the relationship of oral mucosal lesions in tobacco users and denture wearers in a North Indian population. Materials and Methods: The study comprised 3,749 patients attending the Department of Oral Medicine and Radiology, Jodhpur Dental College General Hospital between September 2008 and December 2012, for the treatment of dental problems other than oral mucosal lesions. The ages ranged from 28 years to 83 years, with a mean age of 49.7 years. The results were evaluated using the Pearson Chi-square test, with Yate’s correction and ANOVA tests. Results: A total of 2,318 patients were diagnosed with lesions associated with the use tobacco and the wearing of dentures. The most frequently seen lesion was melanin pigmentation (29.9%) followed by linea alba (22.2%) and frictional keratosis (19.9%). Ulcers (6.1%) were the most common oral lesion seen in patients who wore dentures, followed by hyperplasia (4.8%). A statistically significant relation (P < 0.05) was established between tobacco and melanin pigmentation, frictional keratosis, traumatic ulcerations and leukoplakia. In those who wore dentures a statistically significant relation (P < 0.05) was found between candidiasis, traumatic ulceration and frictional keratosis. Conclusion: The results of the present study indicate that the association of frictional keratosis with tobacco users and wearers of dentures can help in determining the diagnosis and treatment plan for oral cancer. Wearers of dentures should also be recalled for periodic checks at regular intervals and optimum preventive measures implemented. PMID:24672277

Patil, Santosh; Yadav, Nidhi; Patil, Prashant; Kaswan, Sumita

2013-01-01

6

A comparative study of mandibular incisor relation to the lingual frenum in natural dentition and in complete denture wearers.  

PubMed

The determination of the occlusal vertical dimension and proper positioning of the anterior teeth are major factors in making complete dentures which will give optimum service. In this study, efforts were made to evaluate the reliability of measurement of vertical distance between the anterosuperior most point on the lingual frenum and mesioincisal edges of mandibular central incisors in natural dentition among different age groups and in complete denture wearers. Three hundred dentulous subjects belonging to different age groups and hundred edentulous patients wearing complete dentures were selected. The dentulous group was divided into three groups, group I (20-40 years), group II (41-60 years), group III (61 years and above) and the edentulous subjects being group IV ( 40-60 years). Mandibular irreversible hydrocolloid impression (Alginate) was made using modified stock tray. In edentulous subjects impression was made with denture in position. The vertical distance between anterosuperior most point on the lingual frenum and mesioincisal edges of mandibular central incisors was measured on the dentulous casts and casts of complete denture wearer using dental surveyor and the vernier calipers. The values were tabulated and statistically analysed. The mean vertical distance between anterosuperior most point on the lingual frenum and mesioincisal edges of mandibular central incisors among dentulous subjects was 12.3 mm and among complete denture wearers was found to be 13.2 mm. There was no significant variation in the mean vertical distance among dentulous subjects belonging to different age groups. At 5 % significance level, statistically there was a significant difference in the mean vertical distance between group I and group IV; group II and group IV. PMID:24293917

Parimala, B K; Prithviraj, D R

2012-12-01

7

Removable partial dentures: clinical concepts.  

PubMed

This article provides a review of the traditional clinical concepts for the design and fabrication of removable partial dentures (RPDs). Although classic theories and rules for RPD designs have been presented and should be followed, excellent clinical care for partially edentulous patients may also be achieved with computer-aided design/computer-aided manufacturing technology and unique blended designs. These nontraditional RPD designs and fabrication methods provide for improved fit, function, and esthetics by using computer-aided design software, composite resin for contours and morphology of abutment teeth, metal support structures for long edentulous spans and collapsed occlusal vertical dimensions, and flexible, nylon thermoplastic material for metal-supported clasp assemblies. PMID:24286646

Bohnenkamp, David M

2014-01-01

8

Flexible removable partial dentures: a basic overview.  

PubMed

For many years, flexible resin materials have been available for fabricating removable partial denture (RPD) prostheses. Using a nonrigid material for the major connector or other components of an RPD may be a consideration for certain patients. Except for the promotional literature that has been written for flexible resin dentures, there is very little information available in the dental literature concerning nonrigid RPDs. As a result, the decision to use this treatment option depends on the judgment and experience of the dentist and fabricating laboratory. This article summarizes clinically pertinent information about flexible, nonrigid partial dentures. PMID:24598492

Hill, Edward E; Rubel, Barry; Smith, John B

2014-01-01

9

[Resin-bonded fixed partial dentures].  

PubMed

A resin-bonded fixed partial denture is a prosthetic construction which can replace I or several teeth in an occlusal system and which comprises a pontic element which is adhesively attached to 1 or more abutment teeth. To compensate for the limited shear strength of the adhesive layer, the Jixed partial denture is occlusally supported by the abutment(s). A direct resin-bonded fixed partial denture is made of composite, reinforced or not by a frame of flexible metal or fiber material. For an indirect resin-bonded fixed partial denture, a metal, fibre-reinforced composite or ceramic substructure is fabricated in a dental laboratory. The basic principle of a resin-bonded fixed partial denture is minimal invasiveness. However, a restoration in an abutment tooth requires a certain occlusal space which is realized by tooth preparation. Resistance preparations may be performed to improve the longevity of resin-bonded fixed partial dentures. Both financially and biologically, a resin-bonded bridge is a cost-effective prosthetic construction. The longevity is limited, but when the construction fails the negative consequences for the abutments are generally limited, which leaves open several types of other treatments. PMID:23495569

Kreulen, C M; Creugers, N H J

2013-02-01

10

Effect of complete and partial removable dentures on chewing movements.  

PubMed

Partial or complete edentulism impairs mastication. However, it is unclear how the chewing cycle is affected by prosthetics. We evaluated the chewing movements of patients fitted with complete (CD) or removable partial denture (RPD). A total of 29 subjects were kinesiographically evaluated during chewing of peanuts and Optocal portions in a random sequence. The subjects were divided into two groups according to prosthesis type. Group RPD was composed of 14 partially edentulous patients using a lower distal extension RPD (mean age 61 ± 8 years), and group CD contained 15 completely edentulous patients using CD (mean age 65·9 ± 7·9 years) in both jaws. Opening, closing, occlusal and masticatory cycle times, movement angle (opening and closing), maximum velocity (opening and closing), total area and chewing cycle amplitudes were evaluated. The results were subjected to anova and Tukey's HSD test at a significance level of 5%. The RPD group exhibited shorter opening and closing phases and masticatory cycle time (P < 0·05). Maximum velocities were also higher in the RPD group, irrespective of the test material (P < 0·05). The area and amplitude of the chewing envelope was smaller in the CD group (P < 0·0001). The test material did not influence chewing cycles in any of the parameters evaluated (P > 0·05). RPD wearers use a faster chewing sequence with greater vertical and lateral jaw excursions compared with CD wearers. PMID:24372333

Gonçalves, T M S V; Vilanova, L S R; Gonçalves, L M; Rodrigues Garcia, R C M

2014-03-01

11

Removable partial dentures: use of rapid prototyping.  

PubMed

The CAD/CAM technology associated with rapid prototyping (RP) is already widely used in the fabrication of all-ceramic fixed prostheses and in the biomedical area; however, the use of this technology for the manufacture of metal frames for removable dentures is new. This work reports the results of a literature review conducted on the use of CAD/CAM and RP in the manufacture of removable partial dentures. PMID:24750472

Lima, Julia Magalhaes Costa; Anami, Lilian Costa; Araujo, Rodrigo Maximo; Pavanelli, Carlos A

2014-10-01

12

Esthetic designs of removable partial dentures.  

PubMed

The increased emphasis on physical appearance in contemporary society has increased the demand for esthetic dental restorations. Although the success of implant dentistry has expanded the scope of esthetic fixed prostheses, many patients demand a removable partial denture (RPD) for health, anatomic, psychological, or financial reasons. Fabricating an esthetically pleasing RPD while avoiding the unsightly display associated with conventional clasp assemblies often presents a challenge to dentists. This article examines using lingual clasps, proximal undercuts (also known as rotational path insertion), and acetal resin clasps as simple and effective means of improving RPD esthetics. PMID:15055607

Chu, C H; Chow, T W

2003-01-01

13

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

14

The postantifungal effect and phospholipase production of oral Candida albicans from smokers, diabetics, asthmatics, denture wearers and healthy individuals following brief exposure to subtherapeutic concentrations of chlorhexidine gluconate.  

PubMed

Candida albicans is the major aetiological agent of oral candidosis and one of its important virulent factors is the production of extracellular phospholipases, which can be modulated by subtherapeutic concentrations of antifungal agents thus decreasing their pathogenicity. Hence, considering that chlorhexidine gluconate (CG) is a common antimicrobial mouthwash used in dentistry and that its concentration in the mouth reaches subtherapeutic levels during dosage intervals due to the diluent effect of saliva and cleansing effect of the oral musculature, the postantifungal effect (PAFE) and the phospholipase production of oral C. albicans following brief exposure to subtherapeutic concentrations of CG was studied. Fifty C. albicans planktonic oral isolates obtained from smokers, diabetics, asthmatics using steroid inhalers, partial denture wearers and healthy individuals were exposed to three subtherapeutic concentrations of CG (0.005%, 0.0025% and 0.00125%) for 1 h. Isolates unexposed to CG was the control group. Thereafter the antiseptic was removed and the PAFE and phospholipase production was determined by a turbidometric method and a plate assay using an egg yolk agar medium respectively. Mean PAFE (hours) of 50 oral isolates of C. albicans following 1-h exposure to 0.005%, 0.0025% and 0.00125% CG was 6.97, 1.85 and 0.62 respectively. The phospholipase production of these isolates was significantly suppressed with a percentage reduction of 21.68, 18.20 and 14.04% following exposure to 0.005%, 0.0025% and 0.00125% CG respectively. Brief exposure of C. albicans isolates to subtherapeutic concentrations of CG would wield an antifungal effect by suppressing growth and phospholipase production, thereby quelling its pathogenicity. PMID:24655219

Ellepola, Arjuna N B; Joseph, Bobby K; Khan, Z U

2014-09-01

15

Fabricating an interim immediate partial denture in one appointment (modified jiffy denture). A clinical report.  

PubMed

An immediate denture is fabricated before all the remaining teeth have been removed. Its advantages include maintenance of a patient's appearance, muscle tone, facial height, tongue size, and normal speech and reduction of postoperative pain. The purpose of this study is to describe the use of a patient's fixed prosthesis for fabricating an interim immediate partial denture in one appointment. Occlusion, occlusal vertical dimension, and facial support are maintained during the healing period in this procedure. PMID:23279141

Gooya, Ali; Ejlali, Massod; Adli, Amin Rezayi

2013-06-01

16

Oral health-related quality of life in complete denture wearers depending on their socio-demographic background, prosthetic-related factors and clinical condition  

PubMed Central

Objectives: To investigate the differences in impact on oral health-related quality of life (OHRQoL) among complete denture wearers depending on their socio-demographic characteristics, prosthetic-related factors and oral status. Study Design: 51 patients aged 50-90 years treated, from 2005 to 2010, with at least one complete denture at the Department of Buccofacial Prostheses of the Complutense University (Madrid) were enrolled in this cross-sectional study. All of the participants answered the Oral Health Impact Profile (OHIP-14sp) questionnaire. The additive scoring method was used. The prevalence of impacts was calculated by using the occasional threshold (OHIP-14sp score?2). Socio-demographic and prosthetic-related variables were gathered. Patients underwent clinical examination to assess their oral condition. Descriptive probes and Chi-Square tests were run (p?0.05). Results: The predominant participants’ profile was that of a man with a mean age of 69 years wearing complete dentures in both the maxilla and the mandible. The prevalence of impact was 23.5%, showing an average score of 19±9.8. The most affected domains were “functional limitation” and “physical pain”, followed by “physical disability”. Minor impacts were recorded for the psychological and social subscales (“psychological discomfort”, “psychological disability”, “social disability” and “handicap”). The prosthesis’ location significantly influenced the overall patient satisfaction, the lower dentures being the less comfortable. Having a complete removable denture as antagonist significantly hampered the patient satisfaction. Patients without prosthetic stomatitis and those who need repairing or changing their prostheses, recorded significantly higher OHIP-14sp total scores. Conclusions: The use of conventional complete dentures brings negative impacts in the OHRQoL of elderly patients, mainly in case of lower prostheses that required reparation or substitution, with a removable total denture as antagonist. The prosthetic stomatitis in this study was always associated to other severe illness, which may have influenced the self-perceived discomfort with the prostheses, as those patients were daily medicated with painkillers. Key words:Oral Health Impact Profile (OHIP), oral health-related quality of life (OHRQoL), patient satisfaction, complete denture, elderly patients. PMID:23385509

Perea, Carmen; Suarez-Garcia, Maria J.; Del Rio, Jaime; Torres-Lagares, Daniel; Montero, Javier

2013-01-01

17

Modified soft tissue cast for fixed partial denture: a technique  

PubMed Central

In process of fabrication of a fixed partial denture, dies are trimmed to expose margins of the preparations. The need for the soft tissue cast is quite evident as the soft tissue emergence profile that surrounds the prepared tooth is destroyed in the process of fabrication. This article describes a modified technique to fabricate the soft tissue cast for the conventional fixed partial denture. The impression made with the polyvinylsiloxane was first poured to prepare the die cast. After retrieval of the cast, the same impression was poured second time with the resin based resilient material to cover the facial and proximal gingival areas. The remaining portion of the impression was poured with the gypsum material. This technique does not require additional clinical appointment, second impression procedure, technique sensitive manipulations with impression, or cumbersome laboratory procedures. The simplicity of this technique facilitates and justifies its routine use in fabrication of the fixed partial denture. PMID:21503191

2011-01-01

18

Masticatory efficiency in complete denture wearers with reduced dental arches--a randomised cross-over study.  

PubMed

One obstacle to placing artificial posterior teeth in manufacturing complete dentures is a reduction of the space between the maxilla and the mandible. Occasionally, second molar placement is not performed, as it does not affect aesthetics, phonetics or comfort. The aim of this study was to compare the masticatory efficiency between patients wearing maxillary and mandibular complete dentures with reduced dental arches (without second molars) (WSM) and with full dental arches (FDA). Twenty subjects were divided into two groups and randomly received new complete dentures. Patients in Group 1 were given dentures WSM, and those in Group 2 were given dentures with FDA. After the post-placement visits, an initial masticatory efficiency test was performed with Optocal, an artificial test food. Fifteen days later, second molars were placed in Group 1 and removed from Group 2, and a new test was performed. Comminuted material was treated and sieved under vibration. The mean and standard deviation of masticatory efficiency with FDA were 10.4 and 8.1, respectively. In the tests WSM, the mean and standard deviation were 8.4 and 3.3, respectively. After removing the second molars in Group 2 and adding them in Group 1, the mean and standard deviation were 15.7 and 14.7 for Group 1 and 12.5 and 10.4 for Group 2, respectively. Within the limitations of this study, placing artificial teeth up to the first molars can be performed when needed without compromising masticatory efficiency. PMID:24779746

Iegami, C M; Barbosa, W F; Furuyama, R J; Lima, J R B; de Campos, T T; Minagi, S; Tamaki, R

2014-08-01

19

All-ceramic surveyed crowns for removable partial denture abutments  

Microsoft Academic Search

All-ceramic restorations may have limitations when used in combinations with other treatment modalities. Removable partial denture (RPD) abutment crowns are typically shaped to provide guide planes, rest seats, and retentive areas. Porcelain-to-metal crowns are routinely fabricated with retentive contours in the veneering porcelain, but until recently, the contours of the other portions of the restoration were developed in metal. This

Sergio Kancyper; Marianella Sierraalta; Michael E. Razzoog

2000-01-01

20

Simplified technique for the removal of a fixed partial denture.  

PubMed

A simplified method of removing a fixed partial denture has been described. The principle of the Class I or II lever systems is used to deliver force along the path of withdrawal. Carefully applied, this technique may permit removal of a restoration with minimal trauma to the prosthesis and supporting teeth. Where reasonable pressure fails to dislodge the restoration, it should be sacrificed rather than risk permanent damage to the abutment. PMID:7028968

Conny, D J; Brown, M H

1981-11-01

21

Overeruption of teeth opposing removable partial dentures: a preliminary study.  

PubMed

One of the purposes of prosthodontic treatment is to prevent overeruption of opposing teeth, but there is currently minimal literature describing the efficacy of removable partial dentures (RPDs) in performing this function. This study investigated overeruption following RPD treatment. The study participants were 33 patients treated with RPDs, and overeruption was evaluated by comparing the surface computeraided design data of dental casts made at two different time points-before and after RPD treatment. Overeruption was observed in 38.1% of teeth opposed by the RPD, which was much less than the proportion of teeth that overerupted when not opposed by the RPD. PMID:25191893

Matsuda, Ken-Ichi; Miyashita, Yuji; Ikebe, Kazunori; Enoki, Kaori; Kurushima, Yuko; Mihara, Yusuke; Maeda, Yoshinobu

2014-01-01

22

O-ring coping attachments for removable partial dentures.  

PubMed

Clinical experiences for the past 9 years have demonstrated the practicability of the O-ring coping attachment, a modification of the telescopic crown-and-sleeve coping retainers, for removable partial dentures. A circumferential groove placed in the primary coping receives an elastomeric O-ring that fits into a corresponding groove made in the internal surface of the telescopic crown. The O-ring not only provides controllable retention but also acts as a shock absorber. Long-term retention of the prostheses can be easily maintained by periodic replacements of the O-rings. Sophisticated procedures and expensive machines are not required to make the prostheses. Excellent patient acceptance and the versatility in clinical applications make this system one of the winning designs for removable partial prosthodontics. PMID:7473276

Lee, M W; Baum, L; Pence, B; Hererra, W

1995-09-01

23

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

24

All-ceramic surveyed crowns for removable partial denture abutments.  

PubMed

All-ceramic restorations may have limitations when used in combinations with other treatment modalities. Removable partial denture (RPD) abutment crowns are typically shaped to provide guide planes, rest seats, and retentive areas. Porcelain-to-metal crowns are routinely fabricated with retentive contours in the veneering porcelain, but until recently, the contours of the other portions of the restoration were developed in metal. This article describes the fabrication of all-ceramic crowns for RPDs with rest seats and guide planes in densely sintered aluminum oxide and retentive areas in veneering porcelain. Within the limitations outlined, this procedure allows the practitioner to use all-ceramic crowns in situations previously reserved for metal or metal-ceramic restorations. PMID:11044845

Kancyper, S; Sierraalta, M; Razzoog, M E

2000-10-01

25

Fixed partial dentures investigated by optical coherent tomography  

NASA Astrophysics Data System (ADS)

Fixed partial prostheses as integral ceramics, integral polymers, metal ceramics or metal polymers bridges, are mainly used in the frontal part of the dental arch (especially the integral bridges). They have to satisfy high stress requirements as well as esthetic. The masticatory stress may induce fractures of the bridges. These may be triggered by initial materials defects or by alterations of the technological process. The fractures of these bridges lead to functional, esthetic and phonetic disturbances which finally render the prosthetic treatment inefficient. The purpose of this study is to evaluate the capability of en-face optical coherence tomography (OCT) in detection and analysis of possible fractures in several integral fixed partial dentures. The materials used were represented by several fixed partial prostheses, integral ceramics, integral polymers, metal ceramics and metal polymers bridges. In order to discover the defects, scanning was performed from incisal, vestibular, oral and cervical directions material defects such as fractures and pores were investigated using OCT. In conclusion, en-face OCT has proven as a valuable non invasive method to investigate fixed partial prostheses before their insertion in the oral cavity.

Sinescu, Cosmin; Negrutiu, Meda; Todea, Carmen; Hughes, Mike; Tudorache, Florin; Podoleanu, Adrian G.

2008-02-01

26

[Influence of the supporting mechanism of removable partial denture on the stomatognathic system].  

PubMed

The connecting rigidity of the retainer and the denture supporting area may influence the distribution of the occlusal load. Three types of retainers (wrought wire clasp, Akers cast clasp and conical crown telescopic retainer) and three outline forms of denture bases designed for distal extension removable partial dentures were assessed in six patients with Kennedy Class II situations. To evaluate the influence of oral function, mandibular displacement, abutment tooth displacement, and denture base exerted pressure were measured simultaneously during maximum voluntary clenching. The mandibular displacement increased when the connecting rigidity decreased or the size of the denture base was reduced. The abutment tooth displacement increased as the denture base was reduced with the Akers clasp. The denture base pressure increased as the denture base reduced with the wrought wire clasp. The conical crown telescopic retainer did not cause overloading to the supporting tissues even when the denture base was reduced. It was also revealed that the abutment tooth tended to displace distally when a distal occlusal rest was prepared on the abutment tooth. PMID:20415245

Tsuchiya, Kyoko

2010-03-01

27

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

28

Button versus buttonless castings for removable partial denture frameworks.  

PubMed

Casting removable partial dentures (RPDs) without completely filling the sprue channels and generating casting buttons would result in saving metal and making more defect-free castings. This investigation tested whether a complete and sound RPD casting can be obtained when a minimal amount of metal is used. A factorial experimental design, three spruing methods, two metal feeding directions, and two different weights of metal were used to cast 60 Kennedy class II, modification 1 RPDs. The metal used to cast each framework was either enough to result in a full button or in no button. Visual and radiographic examinations and counting of defects were made by two independent operators who were unaware of the spruing method, feeding direction, or amount of metal used to make the framework. The completeness of the casting and the presence of porosities were evaluated for clasps, major connectors, and meshworks. The use of minimal metal to cast RPDs was equally as successful as using enough for a full button, provided that the appropriate spruing arrangement and metal feeding direction were chosen. Indirect metal feeding for maxillary RPDs was successful with the proper spruing arrangement. PMID:7990051

Mohammed, H; Hassaballa, M A; Talic, Y F

1994-10-01

29

Comparison of Effects of Bleach and Cleansing Tablet on Reflectance and Surface Changes of a Dental Alloy Used for Removable Partial Dentures  

Microsoft Academic Search

Proper hygienic care of removable partial dentures is important for maintaining a healthy oral mucosa. A daily home care routine is the responsibility of the patient to maintain oral hygiene. A dentist must inform the patient about denture cleansers used for plaque control. Common denture cleansers may negatively affect the surface of alloys used to make partial dentures. The purpose

Tayyar Güngör

2003-01-01

30

Composite veneering of metal based fixed partial dentures.  

PubMed

The aim of this in vitro study was to determine the thermal mechanical properties of veneering composites after polymerization with the appropriate polymerization device. Fracture tests were performed to investigate the effect on fixed partial dentures (FPDs). Dynamic mechanical thermal analysis was used to determine the temperature-dependent mechanical properties. To approximate the clinical situation, the fracture resistance of three-unit metal-based FPDs with different composite veneering was investigated after a simulated 5-year oral wearing period. The restorations were made of a high gold alloy and veneered with three different composites. To determine the influence of fabrication, one composite was used in a light-polymerizing and a heat/pressure-curing version and, in addition, a newly developed heat protection paste was used. After a 5-year simulation period, the fracture resistance was determined. The storage modulus varied between 14268 N mm(-2) (Belleglass) and 6616 N mm(-2) (Sinfony). Adoro showed no significant differences between light curing (9155 N mm(-2)) and heat curing (8184 N mm(-2)) variations. The Adoro-veneering with the heat protection paste showed the highest median fracture strength (1700 N), followed by Adoro LC (1555 N), Belleglass (1051 N), Adoro HP (1150 N) and Sinfony (909 N). The most common failure type occurring in all FPDs was a cracking of the composite, exposing the metal framework. All FPDs showed stress cracking of the composite. The heat protection paste seemed to reduce the crack formation after fabrication and increased the fracture resistance of the composite veneering. Stress cracking after thermal cycling and mechanical loading affected all composites, but all veneered three-unit alloy FPDs showed a fracture resistance sufficient for posterior application. PMID:16011641

Rosentritt, M; Behr, M; Brückner, H; Handel, G

2005-08-01

31

Clinical application of removable partial dentures using thermoplastic resin-part I: definition and indication of non-metal clasp dentures.  

PubMed

This position paper proposes a definition and naming standard for removable partial dentures (RPDs) using thermoplastic resin, and presents a guideline for clinical application. A panel of 14 experts having broad experience with clinical application of RPDs using thermoplastic resin was selected from members of the Japan Prosthodontic Society. At a meeting of the panel, "non-metal clasp denture" was referred as the generic name of RPDs with retentive elements (resin clasps) made of thermoplastic resin. The panel classified non-metal clasp dentures into two types: one with a flexible structure that lacks a metal framework and the other having a rigid structure that includes a metal framework. According to current prosthetic principles, flexible non-metal clasp dentures are not recommended as definitive dentures, except for limited cases such as patients with a metal allergy. Rigid non-metal clasp dentures are recommended in cases where patients will not accept metal clasps for esthetic reasons. Non-metal clasp dentures should follow the same design principles as conventional RPDs using metal clasps. PMID:24461323

Fueki, Kenji; Ohkubo, Chikahiro; Yatabe, Masaru; Arakawa, Ichiro; Arita, Masahiro; Ino, Satoshi; Kanamori, Toshikazu; Kawai, Yasuhiko; Kawara, Misao; Komiyama, Osamu; Suzuki, Tetsuya; Nagata, Kazuhiro; Hosoki, Maki; Masumi, Shin-Ichi; Yamauchi, Mutsuo; Aita, Hideki; Ono, Takahiro; Kondo, Hisatomo; Tamaki, Katsushi; Matsuka, Yoshizo; Tsukasaki, Hiroaki; Fujisawa, Masanori; Baba, Kazuyoshi; Koyano, Kiyoshi; Yatani, Hirofumi

2014-01-01

32

Why do dentists struggle with removable partial denture design? An assessment of financial and educational issues  

Microsoft Academic Search

Aim Published studies in the international dental literature illustrate that the quality of prescription and fabrication of cobalt-chromium removable partial dentures (CCRPDs) by general dental practitioners frequently fail to comply with ethical and legal requirements. The reasons cited for this in the past have broadly related to either financial or educational issues. The aim of this investigation is to determine

P F Allen; C D Lynch

2006-01-01

33

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

34

Comparative study of circumferential clasp retention force for titanium and cobalt-chromium removable partial dentures  

Microsoft Academic Search

Statement of Problem. The interest in using titanium to fabricate removable partial denture (RPD) frameworks has increased, but there are few studies to support its use. Purpose. The objective of this study was to compare circumferential RPD clasps made of commercially pure titanium and identical clasps made of 2 different cobalt (Co)-chromium (Cr) alloys by testing insertion\\/removal and radiographically inspecting

Renata Cristina Silveira Rodrigues; Ricardo Faria Ribeiro; Maria da Gloria Chiarello de Mattos; Osvaldo Luiz Bezzon

2002-01-01

35

A simplified technique for solving the transfer problem of implant-supported fixed partial dentures for patients with microstomia.  

PubMed

Techniques for treating a fully or partially edentulous patient with microstomia have been developed to overcome the challenge of accessing the oral cavity. Management of the problems associated with providing implant-supported fixed partial dentures for patients with microstomia has not been well reported. This article describes a solution for the transfer problem that occurs when making an impression of an implant-supported fixed partial dentures for patients with microstomia. PMID:22103246

Uludag, Bulent; Polat, Serdar; Sahin, Volkan; Tokar, Emre; Ertug, Omer

2013-04-01

36

Natural Teeth Replacing Artificial Teeth in a Partial Denture: A Case Report  

PubMed Central

The aesthetic replacement of anterior teeth in cases of immediate partial denture is always a challenging work for prosthodontists. There is always problem of matching size, colour, shade and shape of the replaced tooth with those of the natural teeth. It was most difficult to satisfy the patients who have high aesthetic demands. Here is a report of a case where patient’s own natural tooth was used for replacement in an immediate partial denture. An immediate denture is defined as “any removable dental prosthesis which is fabricated for placement immediately, following the removal of a natural tooth/teeth” . Patients with missing anterior teeth lack an impressive appearance aesthetically and as well as psychologically. Tooth loss leads to a certain degree of loss of function. This loss of function might lead to an impairment of oral health which is related to quality of life. An immediate denture can replace 1-16 teeth in either the maxillary or the mandibular arch, or in both arches. The need for the immediate replacement of a missing tooth is more in case of an anterior tooth, where aesthetics is of prime concern. The replacement of an anterior tooth is most technique sensitive, as it includes the patient’s expectations, which include, matching with proper shade, shape and size as those of his/her natural teeth. So, here is a case presentation where modern day patient expectations were taken into consideration. PMID:24086926

Satapathy, Sukanta Kumar; Pillai, Ajay; Jyothi, Ramya; Annapurna, P. Durga

2013-01-01

37

The Effect of Incorporation, Orientation and Silane Treatment of Glass Fibers on the Fracture Resistance of Interim Fixed Partial Dentures  

Microsoft Academic Search

Fracture of interim fixed partial dentures (FPD) is of important concern to the dental surgeon, especially with long-span\\u000a fixed partial dentures or areas of heavy occlusal stress. Polymers used in interim FPDs, reinforced with glass fibers have\\u000a shown to have a positive effect on the fracture resistance of interim FPDs. Since little research has been done on the influence\\u000a of

Gupta BasantY; Y. G. Reddy

2011-01-01

38

Removable partial denture abutments restored with all-ceramic surveyed crowns.  

PubMed

All-ceramic crowns are used as alternatives to conventional metal-ceramic crowns for the restoration of single teeth. Traditionally all-ceramic restorations possessed physical properties that contraindicated their use in many treatment situations. The strength that zirconia ceramics exhibit seems to support the hypothesis that, in specific situations, an all-ceramic crown may be used to restore removable partial denture (RPD) abutments in areas previously reserved for metal or metal-ceramic restorations. Abutments for RPDs may now be fabricated with Procera AllZirkon with the classically prepared guide planes and rest seats. This article provides an overview of a technique for the fabrication of a zirconia-based crown to be used in conjunction with removable partial dentures using the Procera CAD/CAM technology. PMID:16594359

Carracho, Jose F; Razzoog, Michael E

2006-04-01

39

Overlay removable partial dentures for a patient with ectodermal dysplasia: a clinical report.  

PubMed

The orofacial characteristics of ectodermal dysplasia include anodontia or hypodontia, hypoplastic conical teeth, underdevelopment of the alveolar ridges, frontal bossing, a depressed nasal bridge, protuberant lips, and hypotrichosis. Patients with this disease often need complex prosthetic treatment. The options for a definitive treatment plan may include fixed, removable, or implant-supported prostheses, singly or in combination. However, financial constraints and other priorities can prevent patients from choosing the most desirable treatment. This clinical report describes the diagnosis and treatment of ectodermal dysplasia in an 18-year-old man. The treatment included interim removable partial dentures fabricated to establish an acceptable therapeutic occlusal vertical dimension, followed by definitive overlay removable partial dentures and composite restorations. PMID:11753305

Pavarina, A C; Machado, A L; Vergani, C E; Giampaolo, E T

2001-12-01

40

Selection of the Optimal Removable Partial Denture Clasp Arm Design Using Finite Element Analysis  

NASA Astrophysics Data System (ADS)

Achieving removable partial denture clasp arm designs producing less stress is very important for clinical use. The aim of the study was to achieve three-dimensional models in order to optimize cast clasp arm designs. The teeth surfaces obtained after scanning were used as a support for experimental clasp modeling. Three-dimensional models of the clasp arms were used for stress and displacement analyses, to identify areas of minimal strengths.

Liliana, Sandu; Florin, Topala; Sorin, Porojan

2010-09-01

41

Survey of Impression Materials and Techniques in Fixed Partial Dentures among the Practitioners in India  

PubMed Central

Objective. Anecdotal evidence suggests that impression materials and techniques used in general dental practice for fixed partial dentures vary from those taught in dental schools. The aim of this survey was to integrate impression techniques evolved all over the years for fixed partial dentures and to know the techniques and materials which are used in the present day by the practitioners. Materials and Methods. A total of 1000 questionnaires were sent to various practitioners in India, out of which 807 questionnaires were filled. Results. The results showed that 84.8% of prosthodontists (65.56%, urban areas) use elastomeric impression materials as well as irreversible hydrocolloids and 15.2% use irreversible hydrocolloid only. Amongst other practitioners, 55.46% use irreversible hydrocolloid (45%, rural and semiurban areas) and 44.54% use elastomeric impression materials. Elastomeric impression technique practiced most commonly is putty reline with/without spacer (77.2%); other techniques are multiple-mix and monophase techniques. Conclusion. The ideal materials, technique, and armamentarium are required for the long-term success of the treatment for fixed partial denture. Also, if the ideal procedure is not followed, it will lead to a compromised fit of the final prosthesis and failure of the treatment. PMID:23691334

Moldi, Arvind; Puranik, Shivakumar; Karan, Smita; Deshpande, Sumit; Neela, Neelima

2013-01-01

42

Effects of occlusal rest design on pressure distribution beneath the denture base of a distal extension removable partial denture-an in vivo study.  

PubMed

This study aimed to investigate the pressure distribution beneath the denture bases of removable partial dentures (RPDs) with different occlusal rest designs (ORDs) by in vivo measurement. Four types of detachable occlusal rests (mesial and distal, distal, mesial, and nonrest) were placed on the direct abutment teeth of distal extension RPDs in four patients with free-end edentulous mandibles. Pressure measurements were obtained by using thin and flexible tactile sensors. The results showed significant variances with different ORDs in all four patients (P < .05), leading to the conclusion that the pressure distribution on the residual ridge beneath the RPD base was dependent on the ORD. PMID:25191891

Suenaga, Hanako; Kubo, Kei; Hosokawa, Ryoichi; Kuriyagawa, Tsunemoto; Sasaki, Keiichi

2014-01-01

43

Successful flexible bronchoscopic management of a large-sized aspirated partial denture.  

PubMed

A 48-year-old male patient presented to the emergency room with a history of chest pain and breathlessness. Chest X-ray demonstrated a large radio-opaque foreign body in relation to the proximal right bronchial tree. The patient subsequently revealed a history of a misplaced denture 4 months previously. Urgent flexible bronchoscopy (FB) examination demonstrated a large partial denture impacted in the right intermediate bronchus, which was removed successfully using a flexible bronchoscope. Although rigid bronchoscopy (RB) is the procedure of choice for large-sized and impacted airway foreign bodies, the present case highlights the utility of FB in airway foreign body removal. In clinically stable patients with foreign body inhalation, FB can be employed initially as it is an outpatient and cost-effective procedure which can obviate the need for administration of general anaesthesia. PMID:24654239

Jamshed, Nayer; Madan, Karan; Ekka, Meera; Guleria, Randeep

2014-01-01

44

Effects of improvements of poorly fitting dentures and new dentures on masseter activity during chewing  

Microsoft Academic Search

The effects of four sequential modifications to improve occlusion, vertical dimension, retention, and stability of poorly fitting dentures, and of placing new dentures, on the EMG activity were investigated in 21 denture wearers with a mean age of 67.7 years. Electromyographic recordings of right and left masseter muscles were made while the subjects performed masticatory and swallowing threshold tests and

Neal R Garrett; Paul Perez; Charles Elbert; Krishan K Kapur

1996-01-01

45

A preliminary report of designing removable partial denture frameworks using a specifically developed software package.  

PubMed

This article reports on a method to digitally survey and build virtual patterns for removable partial denture (RPD) frameworks using a new three-dimensional (3D) computer-aided design/computer-assisted manufacturing (CAD/CAM) software package developed specifically for RPD design. The procedure included obtaining 3D data from partially dentate casts, deciding on the path of insertion, and modeling the shape of the components of the frameworks digitally. The completed model data were stored as stereolithography (STL) files, which are commonly used in transferring CAD/CAM models to rapid prototyping technologies. Finally, metal RPD frameworks were fabricated using a selective laser melting technique. PMID:20617229

Han, Jing; Wang, Yong; Lü, Peijun

2010-01-01

46

Maxillary rehabilitation using fixed and removable partial dentures with attachments: a clinical report.  

PubMed

Despite requiring dental crown preparation and possible root canal treatment, besides the difficulty of clinical and laboratory repairs, and financial burden, the association between fixed (FPD) and removable partial dentures (RPD) by means of attachments is an important alternative for oral rehabilitation, particularly when the use of dental implants and FPDs is limited or not indicated. Among the advantages of attachment-retained RPDs are the improvements in esthetics and biomechanics, as well as correction of the buccal arrangement of anterior teeth in Kennedy Class III partially edentulous arches. This article describes the treatment sequence and technique for the use of attachments in therapy combining FPD/RPD. PMID:23725409

dos Santos Nunes Reis, José Maurício; da Cruz Perez, Luciano Elias; Alfenas, Bruna Fernandes Moreira; de Oliveira Abi-Rached, Filipe; Filho, João Neudenir Arioli

2014-01-01

47

Single appointment interim partial denture for a patient with a self-maintained provisional.  

PubMed

Interim partial dentures are used often to temporarily restore a patient's dentition to create a satisfactory phonetic, esthetic, and occlusal relationship. This article presents a case involving a patient with an aging self-maintained provisional. A modified technique for interim prosthesis fabrication was utilized that involves decoronation of the teeth prior to extraction, so that the anatomical soft tissues can be visualized. This technique is a cost-effective, expeditious approach to restore function in a single appointment for patients with tooth loss who do not wish to be partially edentulous. PMID:24983165

Rammal, M; Alfonso, C

2014-01-01

48

Systematic clinical evaluation and correction procedures for support of removable partial dentures.  

PubMed

Support, retention, and bracing are the three main functions of a direct retainer in removable partial dentures (RPDs). RPDs must have sufficient supporting ability for proper occlusal rehabilitation. Support ability depends on the fit, size, shape, and location of the occlusal rest. Support cannot be adjusted chairside in most cases. The purpose of this article is to present systematic evaluation criteria for support in an RPD and to describe methods for adjusting cast clasps with improper support. Appropriate design of RPDs and preparation of abutments are also described. PMID:18086138

Sato, Yuji; Shimodaira, Osamu; Kitagawa, Noboru

2008-04-01

49

Adhesion monomers utilized for fixed partial denture (porcelain/metal) repair.  

PubMed

A technique is presented for repair of fatigue-fractured fixed partial dentures with an overlaid, bonded porcelain/metal repair. The repair techniques utilize recent advances in resin-to-metal and resin-to-porcelain adhesion. Clinical procedures are given for adhesion of repair castings to intraoral porcelain or metal surfaces. Metal surface preparation techniques depend on the chemistry of the metal and include intraoral tin plating of noble metals. Direct adhesion of composite resin luting agents is used for base metals. PMID:2094858

Bertolotti, R L; Paganetti, C

1990-07-01

50

Microspectral analysis with laser in microleakage evaluation between infrastructure and veneer materials in fixed partial dentures  

NASA Astrophysics Data System (ADS)

The microleakage at the interface between the metal infrastructure and the veneering part of the fixed partial dentures are a common problem of aesthetic dentistry. It is possible to use the method of laser microspectral analysis for investigations of microleakage at the metal-veneering material interfaces in fixed partial prostheses. The laser microspectral analysis device LMA-10 (Carl Zeiss, Jena) was used equipped with a diffraction spectrometer PGS-2 (Carl Zeiss, Jena). Different fixed partial dentures were used to determine the microleakage between the metal infrastructure and the veneering material. The distribution of chemical elements at interface infiltration was investigated, making a series of craters and establishing the spectra of the vapours emitted from the craters. Data was gathered in various tables of chemical elements showing the quality and the quantity of microleakage. The laser microspectral analysis is a punctual method of analysis, which allows to investigate small quantities of materials of around 0.1 ?g. This method allows to establish the content of atoms and molecules and to perform semi-quantitative and quantitative analysis. By this method it is possible to establish trace elements, i. e. with concentration of ppm (parts per million).

Negrutiu, Meda L.; Sinescu, Cosmin; Draganescu, Gheorghe; Todea, Carmen; Dodenciu, Dorin; Rominu, Roxana

2008-02-01

51

Investigation of the effect of three sprue designs on the porosity and the completeness of titanium cast removable partial denture frameworks  

Microsoft Academic Search

Statement Of Problem. Although titanium has been used to cast removable partial denture frameworks, the casting process is arduous and requires specialized equipment. Purpose. This study evaluated the ability of 3 sprue designs (tree, ball, and circular) to produce complete, void-free castings of removable partial denture frameworks made from commercially pure titanium. Methods And Material. A cast with a Kennedy

Hamda S. Al-Mesmar; Steven M. Morgano; Leonard E. Mark

1999-01-01

52

Radiographic and metallographic evaluation of porosity defects and grain structure of cast chromium cobalt removable partial dentures.  

PubMed

A study was undertaken to determine the defects in the internal microstructure of clasps of cast chromium cobalt removable partial denture frameworks. Ninety cast frameworks were radiographically evaluated for porosity with an industrial radiographic machine. The grain structure of the clasps was analyzed with an optical photomicroscope before and after various heat treatments. The radiographic study showed a large number of internal defects in various parts of removable partial denture frameworks. The grain structure study revealed microporosities randomly distributed within the matrix. Various heat treatments were performed and resulted in no change in the grain structure of the original castings. PMID:8463964

Dharmar, S; Rathnasamy, R J; Swaminathan, T N

1993-04-01

53

Effect of framework design on fracture resistance of zirconium oxide posterior fixed partial dentures  

PubMed Central

Introduction: The effect of framework design modifications in all-ceramic systems is not fully understood. The aim of this investigation was to evaluate the effect of different framework designs on fracture resistance of zirconium oxide posterior fixed partial dentures (FPD). Materials and Methods: Thirty two posterior zirconia FPD cores were manufactured to replace a second premolar. The specimens were divided into four groups; I: 3 × 3 connector and standard design, II: 3 × 3 connector and modified design, III: 4 × 4 connector dimension, and standard design and IV: 4 × 4 connector dimension and modified design. After storing for one week in artificial saliva and thermocycling (2000 cycles, 5-55°C), the specimens were loaded in a universal testing machine at a constant cross-head speed of 0.5 mm/min until failure occurred. The Weibull, Kruskal-Wallis, and Mann-Whitney tests were used for statistical analysis (? = 0.05). Results: The mean fracture resistance of groups with 4 × 4 mm connector was significantly higher than groups with 3 × 3 mm connector (P < 0.001). Although, the fracture resistance of the modified frameworks was increased in the present study (1.1 times), they were not significantly different from anatomic specimens (P = 0.327). Conclusions: The fracture resistance of the zirconia posterior-fixed partial dentures was significantly affected by the connector size; it was not affected by the framework modification. PMID:23559956

Salimi, Hadi; Mosharraf, Ramin; Savabi, Omid

2012-01-01

54

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

55

Veterans Administration Cooperative Dental Implant Study--comparisons between fixed partial dentures supported by blade-vent implants and removable partial dentures. Part I: Methodology and comparisons between treatment groups at baseline.  

PubMed

This study was conducted to determine whether fixed partial dentures supported by dental implants provide an acceptable alternative to conventional removable partial dentures in patients with Kennedy class I or class II edentulous conditions. The acceptability of the new treatment will be based on success rates, impact on the health of the remaining dentition, masticatory performance, patient satisfaction, and maintenance care and cost. The study was planned also to provide comparisons between two designs commonly used by dentists for fabricating removable partial dentures. The designs differed only in terms of the type of the retainer (clasp type) and tooth support (rest location). A total of 272 patients with Kennedy class I and class II edentulous conditions were assigned on a random basis to one of the treatment groups, 134 to receive a removable partial denture and 138 a fixed partial denture supported by a blade-vent implant. All of the patients were medically screened and met prespecified criteria for oral hygiene, bone support for abutment teeth, and size of the residual ridge. Thirty-four patients were eliminated from the study before completion of their treatment. An additional six patients with early implant failures were reentered in the study and followed up as a separate group. The remaining 232 patients received comprehensive dental care, including removable partial dentures for 118 and fixed partial dentures for 114 patients. A series of examinations, radiographs, masticatory performance tests, patient satisfaction, food selection questionnaires, and dietary history were completed before initiation of the treatment, 16 weeks after the insertion of an RPD or an implant, and thereafter at 6-, 18-, 36-, and 60-month intervals. In addition, patients were seen at 6-month intervals for a recall dental examination, oral prophylaxis, plaque instructions, radiographic survey of the implant, and any needed dental treatment. The randomization stratification approach produced two treatment groups with comparable age, number of remaining maxillary and mandibular teeth, type of opposing dentition, and percent of patients with Kennedy class I and class II edentulous conditions. The mean scores of bone support, tooth mobility, and sulcular depths of abutment teeth were also similar. Significant but comparable improvements in oral hygiene and sulcular depth occurred in the two groups after treatment. The periodontal health scores at the 16-week interval serve as the baseline to measure subsequent changes in periodontal health.(ABSTRACT TRUNCATED AT 400 WORDS) PMID:2889828

Kapur, K K

1987-10-01

56

Design of removable partial dentures: a survey of dental laboratories in Greece.  

PubMed

The aim of this study was to compare data on design and fabrication methods of removable partial dentures (RPDs) in two major cities in Greece. A questionnaire was sent to 150 randomly selected dental technicians. The participation rate was 79.3%. The anterior palatal strap, the lingual bar, and the Roach-type clasp arm designs were preferred. Half of the RPDs fabricated were retained using precision attachments. Differences between the two cities were observed in types of major maxillary connectors used, types of attachments and impression materials used, as well as the design of distal-extension RPDs. Postdoctoral education was found to have an impact on RPD fabrication. Despite the differences observed, design and fabrication of RPDs followed commonly used principles. PMID:22259800

Avrampou, Marianna; Kamposiora, Phophi; Papavasiliou, Georgios; Pissiotis, Argirios; Katsoulis, Joannis; Doukoudakis, Asterios

2012-01-01

57

Preoperative intraoral evaluation of planned fixed partial denture pontics using silicone putty.  

PubMed

A preoperative visualization and evaluation of fixed partial denture (FPD) pontics in the anterior dentition is necessary for both the patient and the dentist. Such an evaluation allows patients to decide whether the esthetic and functional parameters of the restoration meet their requirements and expectations. To facilitate such an assessment, a method that allows stable intraoral positioning of the pontics is required. This article describes a technique to achieve this in a simple and effective way before the abutments are prepared. In addition, it also allows the operator to modify the pontics intraorally for esthetics and later incorporate the same pontics into the interim prosthesis. The integration of this pretreatment pontic evaluation procedure into FPD restorations assures better results and patient satisfaction. PMID:23279200

Mysore, Ashwin Raghunandan; Aras, Meena Ajay

2013-06-01

58

Single Tooth Replacement Using InCeram Resin Bonded Fixed Partial Denture: A Clinical Report  

PubMed Central

This clinical report describes a treatment option for replacement of a missing mandibular anterior tooth using InCeram resin bonded fixed partial denture (RBFPD). The conventional approach for replacing mandibular incisors dictates the placement of either a conventional porcelain-fused-to-metal (PFM) bridge, Maryland bridge, or fiber-reinforced composite veneer bridge and several appearance-related disadvantages have been reported in the use of a prosthesis that incorporates a metal substructure. The InCeram bridge is a minimally invasive restoration and eliminates undesirable incisal graying frequently observed in metal RBFPDs. This method was successfully clinically applied to overcome shortcomings of other approaches that may require a minimal invasive technique to preserve lasting sound tooth structure. PMID:24910683

Moslehifard, Elnaz; Farid, Farzaneh

2014-01-01

59

Single Tooth Replacement Using InCeram Resin Bonded Fixed Partial Denture: A Clinical Report.  

PubMed

This clinical report describes a treatment option for replacement of a missing mandibular anterior tooth using InCeram resin bonded fixed partial denture (RBFPD). The conventional approach for replacing mandibular incisors dictates the placement of either a conventional porcelain-fused-to-metal (PFM) bridge, Maryland bridge, or fiber-reinforced composite veneer bridge and several appearance-related disadvantages have been reported in the use of a prosthesis that incorporates a metal substructure. The InCeram bridge is a minimally invasive restoration and eliminates undesirable incisal graying frequently observed in metal RBFPDs. This method was successfully clinically applied to overcome shortcomings of other approaches that may require a minimal invasive technique to preserve lasting sound tooth structure. PMID:24910683

Moslehifard, Elnaz; Farid, Farzaneh

2014-01-01

60

A comparison of impression materials for complete-arch fixed partial dentures.  

PubMed

This study compared the marginal fit of complete-arch fixed prostheses under simulated clinical conditions. Prostheses were made on casts constructed from three commonly used impression materials; polyether, polyvinyl siloxane (medium-viscosity and putty-wash), and reversible hydrocolloid. A maxillary dentoform with four abutment teeth was used as the master cast and six impressions were made with each material. Individual castings for each abutment were made on the stone casts. The abutment castings were luted together on the casts to provide a complete-arch fixed partial denture using a ticonium framework and acrylic resin. The marginal fit of the abutment castings was measured on the master cast before and after the prostheses were luted together. The polyether and both addition silicone impression materials were significantly more accurate than the reversible hydrocolloid in both situations. All of the single castings were clinically acceptable, but the luted restorations made from reversible hydrocolloids were not. PMID:2051350

Dounis, G S; Ziebert, G J; Dounis, K S

1991-02-01

61

The qualitative assessment of cobalt-chromium castings for partial dentures.  

PubMed

Criteria for objective assessment of cobalt-chromium castings have been developed. A random sample of 21 commercial dental laboratories specialising in the production of cobalt-chromium castings was selected. Identical casts and instructions for the construction of a lower partial denture framework were sent to each of them. The resultant castings were assessed according to specific criteria relating to detailed design features. Only one laboratory produced a casting which conformed completely with the design instructions. Significant defects were found in a high proportion of castings. The range of charges was from 28 pounds to 85 pounds. The results of the qualitative assessments suggest only a very weak relationship between laboratory charges and the quality of cobalt-chromium castings. Suggestions are made for minimum standards that may be applied in clinical practice. PMID:2650726

Barsby, M J; Schwarz, W D

1989-03-25

62

No difference in the 5-year survival rates between the resin-bonded cantilever bridge and the removable partial denture for the restoration of the shortened dental arch  

Microsoft Academic Search

DesignThis was a randomised controlled trial (RCT) in a dental hospital.InterventionResin-bonded fixed partial dentures (RBFPD) or removable partial dentures (RPD) were compared. The RBFPD restored 1 occlusal unit, up to but not beyond the second premolar, by means of single pontics cantilevered from single abutments whenever possible. Bilateral lower free-end saddle RPD were constructed on cast metal frameworks that incorporated

Ben Balevi

2008-01-01

63

Short-term retrospective case series of implant-assisted removable partial dentures with locator abutments.  

PubMed

The purpose of this retrospective case series was to report on the clinical performance of implant-assisted removable partial dentures (IARPDs) with Locator abutments in different partial edentulism situations, with a mean follow-up period of 28.6 months. Twelve consecutive patients were treated with IARPDs. A total of 24 implants were placed in the edentulous area. Minimum follow-up period was 12 months. Overall patient satisfaction, health of peri-implant tissues, survival of implants and abutments, and prosthetic complications were reported. Overall implant survival was 91.6%; two implants failed. No major complications were reported-only one IARPD metal framework broke. No Locator abutment loosening was reported. Within the limitations of this retrospective study, treatment with IARPDs can improve the patient's function, phonetics, and esthetics without the need for extensive bone regeneration surgeries and prosthodontic rehabilitations. However, well-designed prospective clinical studies on IARPDs are needed to support their long-term use. PMID:25411746

Ortiz-Puigpelat, Octavi; Gargallo-Albiol, Jordi; Hernández-Alfaro, Federico; Cabratosa-Termes, Josep

2014-01-01

64

Influence of ridge type on mandibular distal extension removable partial denture.  

PubMed

The aim of this study was to use photoelastic models to analyze the distribution of stress caused by the incidence of loads on a mandibular distal extension removable partial denture, both on the abutment teeth and on differently shaped residual ridges: distal ascending, descending-ascending, horizontal and distal descending. The best type of retainer and location of the rest on the last abutment tooth were determined for the different types of ridge. Four models were made from photoelastic resin (PL-1 for the teeth and PL-2 for the alveolar ridge), one for each kind of ridge. For each model, 4 removable partial dentures (RPD) were made (16 RPD altogether): T-bar retainer and distal rest, T-bar retainer and mesial rest, circumferential retainer and distal rest, and circumferential retainer and mesial rest. The models were placed on a circular polariscope and a 100 N axial load (point load) was applied to premolars and molars of the RPD. The formation of photoelastic bands was photographed for qualitative analysis. Results showed that the horizontal ridge had better distribution of stress, while the distal descending ridge had greater concentration of stress. The circumferential retainer had greater areas of stress for all types of ridges except the horizontal ridge, where there was no influence related to retainer type. The distribution of stress was similar among the different types of ridges when the rest was mesial or distal to the last abutment tooth, except for the distal descending ridge, where there was greater concentration of stress when the rest was located distally to the last abutment tooth. Thus, it may be concluded that (1) the situation was least favorable for the distal descending ridge and most favorable for the horizontal ridge, (2) the T-bar retainer had more favorable stress distribution, except when the ridge was horizontal, in which case there was no influence in relation to the type of retainer, (3) the location of the rest showed similar behavior in all except the distal descending ridge. PMID:20645647

Pellizzer, Eduardo Piza; Ferraço, Renato; Tonella, Bianca Piccolotto; Oliveira, Bruno J de Cazaes; Souza, Fabiano Lopes; Falcón-Antenucci, Rosse M

2010-01-01

65

Effects of a removable partial denture and its rest location on the forces exerted on an abutment tooth in vivo.  

PubMed

The 3-dimensional forces exerted on an abutment tooth of a removable partial denture (RPD) were measured in vivo during clenching using a force-measuring device with a piezoelectric transducer. The device was mounted on the mandibular right second premolar of a subject with an edentulous maxilla. The magnitude of the forces was higher and the direction was more posterior without the RPD in place. The direction was most posterior with an RPD with a distal rest only and most anterior with an RPD with a mesial rest only. The 3-dimensional forces exerted on an abutment tooth thus depend on both the presence of a denture and the rest location. PMID:18350947

Kawata, Tetsuo; Kawaguchi, Takeshi; Yoda, Nobuhiro; Ogawa, Toru; Kuriyagawa, Tsunemoto; Sasaki, Keiichi

2008-01-01

66

Reassessing the presence of Candida albicans in denture-related stomatitis  

Microsoft Academic Search

Objective. The aim of this study was to reevaluate the link between Candida albicans and denture-related stomatitis according to a modified Newton classification, which reflects the classic types of inflammation as well as the extent to which the tissue is affected. Study design. Two groups of denture wearers were evaluated for denture-related stomatitis. The presence and number of yeasts on

Jean Barbeau; Jacynthe Séguin; Jean Paul Goulet; Louis de Koninck; Sylvie Louise Avon; Benoit Lalonde; Pierre Rompré; Noëlla Deslauriers

2003-01-01

67

A critically appraised topic review of computer-aided design/computer-aided machining of removable partial denture frameworks.  

PubMed

A critically appraised topic (CAT) review is presented about the use of computer-aided design (CAD)/computer-aided machining (CAM) removable partial denture (RPD) frameworks. A systematic search of the literature supporting CAD/CAM RPD systems revealed no randomized clinical trials, hence the CAT review was performed. A PubMed search yielded 9 articles meeting the inclusion criteria. Each article was characterized by study design and level of evidence. No clinical outcomes research has been published on the use of CAD/CAM RPDs. Low levels of evidence were found in the available literature. Clinical research studies are needed to determine the efficacy of this treatment modality. PMID:24286656

Lang, Lisa A; Tulunoglu, Ibrahim

2014-01-01

68

Comparative Evaluation of Marginal Accuracy of a Cast Fixed Partial Denture Compared to Soldered Fixed Partial Denture Made of Two Different Base Metal Alloys and Casting Techniques: An In vitro Study.  

PubMed

The periodontal health of abutment teeth and the durability of fixed partial denture depends on the marginal adaptation of the prosthesis. Any discrepancy in the marginal area leads to dissolution of luting agent and plaque accumulation. This study was done with the aim of evaluating the accuracy of marginal fit of four unit crown and bridge made up of Ni-Cr and Cr-Co alloys under induction and centrifugal casting. They were compared to cast fixed partial denture (FPD) and soldered FPD. For the purpose of this study a metal model was fabricated. A total of 40 samples (4-unit crown and bridge) were prepared in which 20 Cr-Co samples and 20 Ni-Cr samples were fabricated. Within these 20 samples of each group 10 samples were prepared by induction casting technique and other 10 samples with centrifugal casting technique. The cast FPD samples obtained were seated on the model and the samples were then measured with travelling microscope having precision of 0.001 cm. Sectioning of samples was done between the two pontics and measurements were made, then the soldering was made with torch soldering unit. The marginal discrepancy of soldered samples was measured and all findings were statistically analysed. The results revealed minimal marginal discrepancy with Cr-Co samples when compared to Ni-Cr samples done under induction casting technique. When compared to cast FPD samples, the soldered group showed reduced marginal discrepancy. PMID:24605006

Jei, J Brintha; Mohan, Jayashree

2014-03-01

69

Denture problems  

MedlinePLUS

... inflammation. Dentures can be left overnight in a denture cleaner. Clean, rest, and massage the gums regularly. Rinsing daily with lukewarm salt water will help clean your gums. Do not use toothpicks when wearing dentures.

70

Dual path: a concept to improve the esthetic replacement of missing anterior teeth with a removable partial denture.  

PubMed

The dual path of insertion concept for removable partial denture (RPD) design may be used in esthetically demanding situations. When compared to conventional RPDs, the main advantage of this design is the minimal use of clasps. This clinical report describes the treatment of a patient with an anterior maxillary edentulous area using a dual path RPD. The diagnostic cast was surveyed to ensure the adequacy of the undercuts on the mesial surfaces of the anterior abutments, where rigid minor connectors were placed. Inverted V-shaped canine cingulum rest seats were prepared to provide resistance to tooth movement during function. The dual path RPD concept allows excellent esthetic results, minimizes tooth preparation, and reduces the tendency toward plaque accumulation in a Kennedy class IV partially edentulous arch. PMID:18573150

Carreiro, Adriana da Fonte Porto; Machado, Ana Lucia; Giampaolo, Eunice Teresinha; Santana, Ivone Lima; Vergani, Carlos Eduardo

2008-10-01

71

An altered cast procedure to improve tissue support for removable partial denture  

PubMed Central

Free-end saddles are liable to be displaced under occlusal pressure. This is as a result of the displaceability of the mucosa. The altered cast technique is employed to try and prevent this by making an impression of the mucosa under controlled pressure. The metal framework was constructed on a cast produced by a mucostatic impression material. Base plates were then constructed in self-cured acrylics on the framework in the saddle areas, and these are close fitting. Border molding was carried out; impression was made with zinc oxide eugenol impression paste. In the laboratory, the free-end saddle areas on the master cast are sectioned off. The denture is then positioned on the model and the new saddle areas are poured. The resulting model represents the free-end saddle areas under conditions, which mimic functional load. Denture construction then continues as normal. The distribution of loading of the free-end saddles is improved and denture is more stable. PMID:22114393

Sajjan, Chandrashekar

2010-01-01

72

Effect of different cleansers on the weight and ion release of removable partial denture: an in vitro study  

PubMed Central

Objective Removable partial dentures (RPD) require different hygiene care, and association of brushing and chemical cleansing is the most recommended to control biofilm formation. However, the effect of cleansers has not been evaluated in RPD metallic components. The aim of this study was to evaluate in vitro the effect of different denture cleansers on the weight and ion release of RPD. Material and Methods Five specimens (12x3 mm metallic disc positioned in a 38x18x4 mm mould filled with resin), 7 cleanser agents [Periogard (PE), Cepacol (CE), Corega Tabs (CT), Medical Interporous (MI), Polident (PO), 0.05% sodium hypochlorite (NaOCl), and distilled water (DW) (control)] and 2 cobalt-chromium alloys [DeguDent (DD), and VeraPDI (VPDI)] were used for each experimental situation. One hundred and eighty immersions were performed and the weight was analyzed with a high precision analytic balance. Data were recorded before and after the immersions. The ion release was analyzed using mass spectrometry with inductively coupled plasma. Data were analyzed by two-way ANOVA and Tukey HSD post hoc test at 5% significance level. Results Statistical analysis showed that CT and MI had higher values of weight loss with higher change in VPDI alloy compared to DD. The solutions that caused more ion release were NaOCl and MI. Conclusions It may be concluded that 0.05% NaOCl and Medical Interporous tablets are not suitable as auxiliary chemical solutions for RPD care. PMID:21986653

FELIPUCCI, Daniela N.B.; DAVI, Leticia R.; PARANHOS, Helena F.O.; BEZZON, Osvaldo L.; SILVA, Rodrigo F.; BARBOSA JUNIOR, Fernando; PAGNANO, Valeria O.

2011-01-01

73

A laboratory investigation of the role of guide planes in the retention of cast cobalt-chromium alloy partial denture frameworks  

Microsoft Academic Search

Objectives: This in vitro study examined the resistance to displacement offered by guide planes and the displacement mechanics of a bilateral bounded saddle cast cobalt chrome alloy removable partial denture framework under conditions simulating an average initial fit.Methods: A specially designed model mouth jig fitted with strain gauges to monitor the forces across the guiding plane\\/guiding surface interfaces was used.

M. Ali; N. E. Waters; R. I. Nairn; M. Sherriff

2001-01-01

74

Using a fiber-reinforced composite fixed partial denture to restore a missing posterior tooth: a case report.  

PubMed

With the advent of new adhesive technologies, fiber-reinforced composite fixed partial dentures (FRC-FPDs) have become an inexpensive, esthetic and useful restorative option for patients missing a single tooth. This article describes a case involving an inlay-retained FRC-FPD with a prefabricated fiber-reinforced pontic substructure. In addition, a 6-year follow-up is presented. The FRC-FPD fully restored the single missing molar with simple and conservative intracoronal preparations in the proximal teeth and was deemed clinically acceptable after the evaluation period. The clinical procedures to build a FRC-FPD with a prefabricated fiber-reinforced pontic substructure typically are finished by the clinician in 1 or 2 visits without laboratory assistance, making it a viable alternative for patients who cannot afford implant-based treatment or a conventional metal-ceramic FPD. PMID:23649577

Soares, Carlos Jose; Barreto, Bruno Castro Ferreira; Santos-Filho, Paulo Cesar de Freitas; Raposo, Luis Henrique de Araujo; Martins, Luis Roberto Marcondes

2013-01-01

75

A hinged two-part partial denture used in conjunction with severely tilted teeth: a case report.  

PubMed

A two-part sectional denture can be a useful treatment option when the presence of severe hard tissue undercuts compromises the provision of a satisfactory conventional prosthesis. This article presents a case report illustrating the effective use of a hinged two-part denture in restoring a mandibular Kennedy Class IV edentulous area. A sectional denture approach was selected because of severe proximal and lingual undercuts. PMID:25134363

Singhota, S; Attrill, D C; Patel, U S; Murphy, P

2014-06-01

76

Initial effects of a treatment by fixed partial dentures supported by mini dental implants from a patient's point of view.  

PubMed

Mini dental implants (MDIs) in dentistry are recommended for cases with adequate bone quality and height, but a lack of alveolar bone width. Some studies well documented successful usage of MDIs for a removable denture support, but studies of MDIs supporting fixed prosthodontic restorations are scarce. We aimed to study the effect of fixed partial dentures (FPD) therapy supported by MDIs or by MDIs and natural teeth, on patients self perceived oral health related quality of life (OHRQoL), self perceived oral aesthetics and self perceived chewing function. A total of 23 patients (10 female and 13 men, age range from 54 to 78 years) were included and 61 MDIs were inserted, 10 in the maxilla and 51 in the mandible. In 14 patients FPDs were constructed only on MDIs and in 9 patients FPDs were constructed on both, MDIs and natural teeth. FPDs on MDIs were replacing mostly mandibular incisors, the second maxillary incisors and the first maxillary premolars. Those FPDs supported by both, MDIs and natural teeth had some MDIs inserted in frontal regions to allow a FPD construction. The three questionnaires: the OHIP-CRO14 for the assessment of OHRQoL, the OES-CRO for assessment of oral aesthetics and the Chewing function questionnaire (CFQ) for assessment of chewing function have been administrated twice:prior to the MDIs insertion and three months after the FPD treatment supported by MDIs had been finished. The CFQ and the OHIP summary scores significantly decreased revealing better OHRQoL and better chewing ability after treatment, and the OES scores significantly increased indicating increased self perceived oral aesthetics (p < 0.01). Clinical examination revealed no periimplant inflammation. Patients' data supplement the initially promising clinical findings. However, further follow ups will be necessary to finally confirm the long term clinical benefit of MDIs. PMID:24851629

Persi?, Sanja; Palac, Antonija; Vojvodi?, Denis; Celebi?, Asja

2014-03-01

77

Clinical application of removable partial dentures using thermoplastic resin. Part II: Material properties and clinical features of non-metal clasp dentures.  

PubMed

This position paper reviews physical and mechanical properties of thermoplastic resin used for non-metal clasp dentures, and describes feature of each thermoplastic resin in clinical application of non-metal clasp dentures and complications based on clinical experience of expert panels. Since products of thermoplastic resin have great variability in physical and mechanical properties, clinicians should utilize them with careful consideration of the specific properties of each product. In general, thermoplastic resin has lower color-stability and higher risk for fracture than polymethyl methacrylate. Additionally, the surface of thermoplastic resin becomes roughened more easily than polymethyl methacrylate. Studies related to material properties of thermoplastic resin, treatment efficacy and follow-up are insufficient to provide definitive conclusions at this time. Therefore, this position paper should be revised based on future studies and a clinical guideline should be provided. PMID:24746524

Fueki, Kenji; Ohkubo, Chikahiro; Yatabe, Masaru; Arakawa, Ichiro; Arita, Masahiro; Ino, Satoshi; Kanamori, Toshikazu; Kawai, Yasuhiko; Kawara, Misao; Komiyama, Osamu; Suzuki, Tetsuya; Nagata, Kazuhiro; Hosoki, Maki; Masumi, Shin-ichi; Yamauchi, Mutsuo; Aita, Hideki; Ono, Takahiro; Kondo, Hisatomo; Tamaki, Katsushi; Matsuka, Yoshizo; Tsukasaki, Hiroaki; Fujisawa, Masanori; Baba, Kazuyoshi; Koyano, Kiyoshi; Yatani, Hirofumi

2014-04-01

78

Corrosion of some selected ceramic alloys used in fixed partial dentures and their postsolder joints in a synthetic neutral saliva.  

PubMed

The electrochemical behavior of several alloys used in the frameworks of fixed partial dentures and their corresponding postsolders was studied in artificial saliva as a function of chemical composition. Open circuit potentials and polarization resistances were measured. The general electrochemical behaviors between the cathodic domain and the oxidation of solvent were characterized using cyclic polarization. The possible galvanic corrosion of coupled parent and postsolder alloys was also studied. The polarization resistances were high or very high. During immersion, the noblest alloys stayed in the immunity domains of their base elements, whereas Ni-Cr alloys were quickly passivated. The oxidation of the noble elements occurred only when the alloys were exposed to very high potentials solely achievable by artificial means. However, problems of galvanic corrosion may occur between an alloy and its postsolder joint if they are both exposed to saliva. Such corrosion may lead to a weakening of the framework. The parent alloy was often potentially affected by such corrosion but with low exchange currents. PMID:19196322

De March, Pascal; Berthod, Patrice; Haux, Emeline; Greset, Victor

2009-02-01

79

Influence of posterior dental arch length on brain activity during chewing in patients with mandibular distal extension removable partial dentures.  

PubMed

It is well known that shortened dental arch decreases masticatory function. However, its potential to change brain activity during mastication is unknown. The present study investigates the effect of a shortened posterior dental arch with mandibular removable partial dentures (RPDs) on brain activity during gum chewing. Eleven subjects with missing mandibular molars (mean age, 66.1 years) on both sides received experimental RPDs with interchangeable artificial molars in a crossover trial design. Brain activity during gum chewing with RPDs containing (full dental arch) and lacking artificial molars (shortened dental arch) was measured using functional magnetic resonance imaging. Additionally, masticatory function was evaluated for each dental arch type. Food comminuting and mixing ability and the perceived chewing ability were significantly lower in subjects with a shortened dental arch than those with a full dental arch (P < 0.05). Brain activation during gum chewing with the full dental arch occurred in the middle frontal gyrus, primary sensorimotor cortex extending to the pre-central gyrus, supplementary motor area, putamen, insula and cerebellum. However, middle frontal gyrus activation was not observed during gum chewing with the shortened dental arch. These results suggest that shortened dental arch affects human brain activity in the middle frontal gyrus during gum chewing, and the decreased middle frontal gyrus activation may be associated with decreased masticatory function. PMID:24697794

Shoi, K; Fueki, K; Usui, N; Taira, M; Wakabayashi, N

2014-07-01

80

Injuries sustained in rugby by wearers and non-wearers of mouthguards  

Microsoft Academic Search

Previous studies have shown a higher prevalence of head and neck injuries in non-wearers when compared with wearers of mouthguards. The purpose of the present study was to compare the pattern of injuries to those of past studies and also to investigate whether the injuries sustained differed significantly between wearers and non-wearers. A sample of 321 university students participating on

J B Blignaut; I L Carstens; C J Lombard

1987-01-01

81

Fracture strength of three-unit fixed partial denture cores (Y-TZP) with different connector dimension and design.  

PubMed

True crystalline ceramic materials presently used in restorative dentistry are Al2O3 (alumina) and yttrium-oxide stabilised tetragonal polycrystalline zirconium-dioxide (Y-TZP). To ensure optimal clinical performance, the dimensions of the Fixed Partial Denture (FPD) framework in general and of the connectors in particular, must be adequate. Considered recommendations for connector dimensions for Y-TZP FPDs vary from 2 to 4 mm in occluso-gingival height and 2 to 4 mm in bucco-lingual width. In order to reduce the fracture probability when designing all-ceramic FPDs, the shape of the connector is an important factor to consider. The radius of curvature at the gingival embrasure plays a significant role in the load-bearing capacity. FPDs with small gingival embrasure radii are subjected to high stress concentrations in the connector area during loading, compared to FPDs with large embrasure radii. The aim of this in-vitro study was to investigate how different radii of curvature in the embrasure of the connector area and different connector dimensions could affect the fracture resistance of 3-unit all-ceramic FPDs made of Y-TZP. Forty-eight FPDs in 6 groups of 8 FPDs with different connector design were produced in Procera Zirconia Bridge material. The FPD cores were subjected to heat treatment to simulate veneering. Following cementation, the FPDs were firstly thermocycled for 5,000 cycles, then preloaded for 10,000 cycles and finally loaded to fracture. All the FPDs fractured in the connector area. All the crack propagation which led to fracture started at the gingival embrasure of the connector. Within the limitations of this in-vitro study,the recommended minimum dimension of an anterior 3-unit all-ceramic FPD of Y-TZP is 3 mm in incisal-cervical direction and 2 mm in buccal-lingual direction. By increasing the radius of the gingival embrasure from 0.6 to 0.9 mm, the fracture strength for a Y-TZP FPD with connector dimension 3 x 3 mm increases by 20%. PMID:19994565

Bahat, Zdravko; Mahmood, Deyar J Hadi; Vult von Steyern, Per

2009-01-01

82

Complete denture biofilm after brushing with specific denture paste, neutral soap and artificial saliva.  

PubMed

This study compared the levels of biofilm in maxillary and mandibular complete dentures and evaluated the number of colony-forming units (cfu) of yeasts, after using auxiliary brushing agents and artificial saliva. Twenty-three denture wearers with hyposalivation and xerostomia were instructed to brush the dentures 3 times a day during 3 weeks with the following products: Corega Brite denture dentifrice, neutral liquid soap, Corega Brite combined with Oral Balance (artificial saliva) or tap water. For biofilm quantification, the internal surfaces of the dentures were disclosed, photographed and measured using a software. For microbiological analysis, the biofilm was scrapped off, and the harvested material was diluted, sown in CHROMagar™ Candida and incubated at 37°C for 48?h. Data were analyzed statistically by two-way ANOVA and Tukey's test (?=0.05). Mandibular dentures presented a mean biofilm percentage (µ=26.90 ± 21.10) significantly greater than the maxillary ones (µ=18.0 ± 15.0) (p<0.05). Brushing using Corega Brite combined with Oral Balance (µ=15.87 ± 18.47) was more effective (p<0.05) than using the denture dentifrice (µ=19.47 ± 17.24), neutral soap (µ=23.90 ± 18.63) or tap water (control; µ=32.50 ± 20.68). For the microbiological analysis, the chi-square test did not indicate significant difference between the hygiene products for either type of denture. The more frequently isolated species of yeasts were C. albicans, C. tropicalis and C. glabrata. In conclusion, mandibular dentures had more biofilm formation than maxillary ones. Denture brushing with Corega Brite dentifrice combined with the use of Oral Balance was the most effective method for reduction of biofilm levels, but the use of products did not show difference in yeast cfu counts. PMID:23657413

Paranhos, Helena de Freitas Oliveira; Salles, Antônio Eduardo Sparça; Macedo, Leandro Dorigan de; Silva-Lovato, Cláudia Helena da; Pagnano, Valéria Oliveira; Watanabe, Evandro

2013-01-01

83

Development of a Contemporary Animal Model of Candida albicans-Associated Denture Stomatitis Using a Novel Intraoral Denture System  

PubMed Central

Denture stomatitis (DS) is a fungal infection characterized by inflammation of the oral mucosa in direct contact with the denture and affects up to 50% of denture wearers. Despite the prevalence, very little is known about the role of fungal or host factors that contribute to pathogenesis. Recently, we developed a novel intraoral denture system for rodent research. This denture system consists of custom-fitted fixed and removable parts to allow repeated sampling and longitudinal studies. The purpose of this study was to use this denture system to develop a clinically relevant animal model of DS. To establish DS, rats were inoculated with pelleted Candida albicans, which resulted in sustained colonization of the denture and palate for 8 weeks postinoculation. Biofilm formation on the denture was observed by week 4 and on the palate by week 6 postinoculation. Rats were monitored for clinical signs of disease by assigning a clinical score after macroscopic examination of the palate tissue according to Newton's method. By week 4 postinoculation, the majority of inoculated rats with dentures exhibited a clinical score of 1 (pinpoint erythema). By week 6 and week 8 postinoculation, increasing percentages of rats exhibited a clinical score of 2 (diffuse erythema/edema). Histological analysis of palate tissue demonstrated progressively increasing inflammatory cell recruitment throughout the time course of the infection. Palatal biofilm formation was commensurate with development of palatal erythema, which suggests a role for biofilm in the inflammatory response. PMID:22392931

Johnson, Clorinda C.; Yu, Alika; Lee, Heeje; Fidel, Paul L.

2012-01-01

84

Motion vector analysis of an abutment for a distal-extension removable partial denture: a pilot study.  

PubMed

An investigation was conducted on the effect of various rest-clasp designs on abutment tooth movement when a testing prosthesis was subjected to vertical loading of the bilateral distal-extension base. The results did not reveal statistically significant differences among the rest-clasp designs tested. Variations in rest placement and/or clasp design had an effect on the magnitude and direction of force transmission to, and resultant movement of, the abutment tooth. Less force to the abutment tooth was recorded when a mesial rest was used with the rest-clasp designs as compared to a distal rest. Force transmission to the abutment was found to be greater when the vertical load was applied to the denture base on the same side than when applied to the opposite side of the denture base. PMID:6985668

McCartney, J W

1980-01-01

85

Titanium for removable dentures. I. Laboratory procedures.  

PubMed

To test the hypothesis that titanium (Ti) removable partial dentures (RPDs) would function for a period of at least 2 years without failure, 10 patients were selected to receive dentures made from Ti and Co-Cr. The Ti RPDs were constructed identically to conventional cobalt-chromium (Co-Cr) dentures. Five complete Ti dentures were also included and the laboratory procedures involved for making both complete and partial dentures were evaluated. The detection of internal defects by radiography made the screening of Ti castings possible and led to a rejection of specimens showing porosities of more than 0.5 mm in flexible members. Co-Cr frames on the other hand cannot be screened in this way. The success rate in the casting of Ti was 60% for both partial and complete dentures, but as casting technology has since improved, the rate is expected to be higher, particularly where complete denture palates have optimum thickness. The success rate in the casting of Co-Cr RPDs was 100% without radiographic screening. The weight difference between Ti and Co-Cr RPDs was in the range of 1.3 to 3.9 g at issue and is generally higher as the volume of denture frames increases. A large difference would be of clinical significance in maxillary complete dentures. The low density of Ti allows for the adoption of a useful pre-clinical quality-control process using commonly available dental X-ray units. PMID:9183026

Mori, T; Togaya, T; Jean-Louis, M; Yabugami, M

1997-05-01

86

Trial of an experimental castor oil solution for cleaning dentures.  

PubMed

Denture hygiene is essential because denture biofilm is involved in oral infections and systemic diseases. Although there are chemical agents available on the market, none of them have ideal properties and research on such products is still necessary. The aim of this study was to evaluate the efficacy of a castor bean (Ricinus communis)-based solution for removing denture biofilm, compared to two traditional products (sodium hypochlorite and alkaline peroxide). Fifty maxillary complete denture wearers were instructed to brush their dentures after meals and to immerse their dentures once a day in the following solutions: Saline (20 min; control), Polident alkaline peroxide (3 min), NaOCl (20 min) and 2% castor oil solution (20 min). Participants used each solution for a period of 7 consecutive days, according to a random sequence. After each period, the internal surfaces of maxillary complete dentures were stained with a disclosing solution (1% neutral red), photographed and the disclosed biofilm was quantified with the aid of specific software. The influence of treatments on results was verified by the Friedman test (?=0.05). Tested solutions presented significant difference (Fr=51.67; p<0.001). Saline and NaOCl were significantly different (median: 2.0% and 0.0%) whereas Polident and castor oil presented intermediate results (median: 1.0% and 1.5%, respectively). It can be concluded that the castor oil solution tested in this study was comparable to alkaline peroxide in terms of efficiency in denture biofilm removal. PMID:24789291

Andrade, Ingrid Machado de; Andrade, Kelly Machado de; Pisani, Marina Xavier; Silva-Lovato, Cláudia Helena; de Souza, Raphael Freitas; Paranhos, Helena de Freitas Oliveira

2014-01-01

87

Fabrication of a maxillary posterior fixed partial denture with a type 4 gold alloy and a dual-polymerizing indirect composite.  

PubMed

The aim of the present study was to design and fabricate a maxillary posterior fixed partial denture (FPD) made of a type 4 gold alloy and an indirect composite. Unlike the conventional framework design of a resin veneered restoration, cut-back was extended approximately 1/4 to 1/3 width in the occlusal table of the buccal cusp. Multiple retentive beads 150-200 mum in diameter were placed on the metal surface to be veneered. The gold alloy was cast in a cristobalite mold using a centrifugal casting machine. The cut surface with the retentive beads was air-abraded with alumina, and a priming agent (Alloy Primer) that contained triazine dithione monomer (VTD) was applied. A tooth-colored veneer was then fabricated with a highly loaded light- and heat-cured composite material (Estenia). This design and procedure can be applied as a standardized laboratory technique for fabrication of maxillary posterior restorations and FPDs. PMID:18403895

Matsumura, Hideo; Mori, Shuichi; Tanoue, Naomi

2008-03-01

88

ACANTHAMOEBA GUIDANCE DOCUMENT FOR CONTACT LENS WEARERS  

EPA Science Inventory

The document reviews the risk of Acanthamoeba Keratitis for contact lens wearers. The document also reviews Granulomatous Amebic Encephalitis, another disease associated with Acanthamoeba in immune compromised individuals. Reports indicate that keratitis due to Acanthamoeba is a ...

89

The effectiveness of chemical denture cleansers and ultrasonic device in biofilm removal from complete dentures  

PubMed Central

Adequate denture hygiene can prevent and treat infection in edentulous patients. They are usually elderly and have difficulty for brushing their teeth. Objective This study evaluated the efficacy of complete denture biofilm removal using chemical (alkaline peroxide-effervescent tablets), mechanical (ultrasonic) and combined (association of the effervescent and ultrasonic) methods. Material and Methods Eighty complete denture wearers participated in the experiment for 21 days. They were distributed into 4 groups (n=20): (1) Brushing with water (Control); (2) Effervescent tablets (Corega Tabs); (3) Ultrasonic device (Ultrasonic Cleaner, model 2840 D); (4) Association of effervescent tablets and ultrasonic device. All groups brushed their dentures with a specific brush (Bitufo) and water, 3 times a day, before applying their treatments. Denture biofilm was collected at baseline and after 21 days. To quantify the biofilm, the internal surfaces of the maxillary complete dentures were stained and photographed at 45º. The photographs were processed and the areas (total internal surface stained with biofilm) quantified (Image Tool 2.02). The percentage of the biofilm was calculated by the ratio between the biofilm area multiplied by 100 and the total area of the internal surface of the maxillary complete denture. Results The Kruskal-Wallis test was used for comparison among groups followed by the Dunn multiple-comparison test. All tests were performed respecting a significance level of 0.05. Significant difference was found among the treatments (KW=21.18; P<0.001), the mean ranks for the treatments and results for Dunn multiple comparison test were: Control (60.9); Chemical (37.2); Mechanical (35.2) and Combined (29.1). Conclusion The experimental methods were equally effective regarding the ability to remove biofilm and were superior to the control method (brushing with water). Immersion in alkaline peroxide and ultrasonic vibration can be used as auxiliary agents for cleaning complete dentures. PMID:22231005

CRUZ, Patricia Costa; de ANDRADE, Ingrid Machado; PERACINI, Amanda; de SOUZA-GUGELMIN, Maria Cristina Monteiro; SILVA-LOVATO, Claudia Helena; de SOUZA, Raphael Freitas; PARANHOS, Helena de Freitas Oliveira

2011-01-01

90

Denture Adhesives  

MedlinePLUS

... Zinc is a mineral that is an essential ingredient for good health. It is found in protein-rich foods such as shellfish, beef, chicken and nuts, as ... and that although they are safe to use in moderation as directed, if overused, ... product ingredients. Know that there are zinc-free denture adhesives ...

91

The role of friction in the mechanism of retaining the partial removable dentures with double crown system.  

PubMed

Cylindrical telescopic crowns belong to bolt dentures, because their adhesion strength is based on the friction force. The magnitude of static and slide friction forces depends on the strain within the contact area and properties of materials employed. Friction force value between telescope elements declines in the first phase of wearing period and, subsequently, maintains particular constant value of 8 to 10 N. In the telescopic technique, homo and heterogenic joints are used. The following prosthodontic materials have been examined: goldbase alloys (Degudent Kiss, Degulor M), cobalt-base alloy (Brealloy 270), ceramics (Zircon Oxide, Zirconia) during tribological investigations on FGP composite resin. The cooperating surfaces were moistened with synthetic saliva. The research confirmed the dependence of the static friction coefficient on the contact pressure for the analyzed pairs of materials used in prosthodontics. The biggest effect of the contact pressure on the coefficient of friction value occurs when the ceramic rubs on FGP composite resin. The most stable friction coefficient in the context of contact pressure changes as well as life has been found in the case of the cobalt alloy Brealloy 270. An interesting material is a gold alloy Degulor M, for which the coefficient of friction varies only slightly with pressure in the range of 0.6 to 0.9 MPa. PMID:24479667

D?browa, Tomasz; Dobrowolska, Anna; Wieleba, Wojciech

2013-01-01

92

Elucidating role of salivary proteins in denture stomatitis using a proteomic approach†  

PubMed Central

Denture stomatitis (DS) is the most common oral pathology among denture wearers, affecting over one-third of this group. DS is usually associated with C. albicans. However, unlike other oral candidiasis, most DS patients have intact host immunity. The presence of a denture alone is usually sufficient for DS. Saliva and its protein contents can theoretically predispose some denture wearers to DS and others resistant toward DS. Here we proposed for the first time to define salivary proteomic profiles of denture wearers with and without DS. SELDI-TOF/MS analysis suggests that there is a proteomic differentiation among control, localized and generalized DS. Based on initial SELDI-TOF/MS profiling, we further used reversed phase liquid chromatography, MALDI-TOF/MS, and LC-MS/MS to characterize the salivary proteins associated with DS. Nineteen proteins based on SELDI-TOF/MS profiling were found including cystatin-SN, statherin, kininogen-1, desmocollin-2, carbonic anhydrase-6, peptidyl-prolyl cis–trans isomerase A like peptides, cystatin C, and several immunoglobulin fragments. The proteomic content gives evidence of the interaction between host tissue, saliva, and candida. Further examination in larger populations of these proteins may help to gain a better understanding of DS pathological processes and improve DS treatments. PMID:23041753

Altarawneh, Sandra K.; Baxter, Sarah Schwartz; Carlson, Jim; Ross, Gary F.; Border, Michael B.; Mack, C. Russell; Byrd, Warren C.; Dibble, Christopher F.; Barros, Silvana; Loewy, Zvi; Offenbacher, Steven

2012-01-01

93

A Treatment Protocol for Restoring Occlusal Vertical Dimension Using an Overlay Removable Partial Denture as an Alternative to Extensive Fixed Restorations: A Clinical Report  

PubMed Central

Treatment options for patients with severe attrition resulting in reduced occlusal vertical dimension are often limited to fixed prosthesis to reestablish proper occlusal vertical dimension and functional occlusion. In some cases such as when there are limited finances, minimal esthetic concerns, and medical considerations fixed prosthesis may not be the ideal treatment option. Overlay removable partial dentures (ORPDs) can be used as a provisional or interim prosthesis as well as permanent prosthesis in these cases. While ORPDs can provide a reversible and relatively inexpensive treatment for patients with a significantly compromised dental status, there is not much scientific evidence in the literature on ORPDs. Most studies published on ORPDs to date are primarily reviews and clinical reports. In this article, literatures on ORPDs are summarized and a patient treated with interim and permanent ORPDs is presented. This article reviews previously published literatures on the use of ORPDs. Indications, advantages and disadvantages are discussed. Treatment protocol with an example of the prosthodontic treatment of a patient with severely worn dentition with an interim ORPD and later a permanent ORPD are discussed in details. PMID:19915723

Patel, Mit B; Bencharit, Sompop

2009-01-01

94

Transition from failing dentition to full-arch fixed implant-supported prosthesis with a staged approach using removable partial dentures: a case series.  

PubMed

The present retrospective case series is aimed at evaluating a staged approach using a removable partial denture (RPD) as an interim prosthesis in treatment to correct a failing dentition until such time as a full-arch fixed implant-supported prosthesis may be inserted. Eight patients, who had undergone maxillary full-arch rehabilitation with dental implants due to poor prognosis of their dentitions, were analyzed. All treatment included initial periodontal therapy and a strategic order of extraction of hopeless teeth. An RPD supported by selected teeth rehabilitated the compromised arch during implant osseointegration. These remaining teeth were extracted prior to definitive prosthesis delivery. Advantages and drawbacks of this technique were also recorded for the cases presented. Among the advantages provided by the staged approach are simplicity of fabrication, low cost, and ease of insertion. Additionally, RPD tooth support prevented contact between the interim prosthesis and healing abutments, promoting implant osseointegration. The main drawbacks were interference with speech and limited esthetic results. Implant survival rate was 100% within a follow-up of at least 1 year. The use of RPDs as interim prostheses allowed for the accomplishment of the analyzed rehabilitation treatments. It is a simple treatment alternative for patients with a low smile line. PMID:24118202

Cortes, Arthur Rodriguez Gonzalez; Cortes, Djalma Nogueira; No-Cortes, Juliana; Arita, Emiko Saito

2014-06-01

95

[Study on the dynamic behavior of mandibular distal-extension removable partial denture utilizing finite element method. 2. Influence of the location of rest and displaceability of residual ridge mucosa].  

PubMed

The purpose of this study is to investigate the denture design and displaceability of residual ridge mucosa and its relation to the load distribution on the remaining oral structures. In this study, the effects of the location of rest and displaceability of the mucosa were demonstrated utilizing the two-dimensional non-linear analysis reported on Part 1. The results were as follows. 1. Mesial rest could be simulated on the finite element model using pin element. 2. Removable partial denture with mesial rest distributed more stress on the mesial abutment teeth than that with distal rest. 3. Lesser displaceability of residual ridge mucosa resulted in a decrease of stress concentration around the most distal abutment and the uniform stress distribution on residual ridge was increased. 4. In the simulated condition where an increased pressure was applied on the mucosa, the behavior of the saddle on the mucosa with large displaceability could be similar to that of the mucosa with small displaceability. The results of this study suggested that mesial rest on the most distal abutment and pressure impression was desirable in removable partial denture with distal-extension. PMID:2489773

Nogawa, A

1989-12-01

96

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 ...

97

The trial denture.  

PubMed

1. Many difficult situations can be avoided if the dentist keeps constantly aware of the physiologic, the psychologic, and the artistic factors involved in the construction of dentures, whether they be partial or complete. 2. No one would think of buying an automobile without getting adequate instruction in how to drive; neither should a patient expect to wear artifical restorations without training and practice. 3. The dentist at the try-in should check: a. The bases for fit and extension. b. Thin labial flange at frenum area. c. Posterior palatal seal and length of upper. d. Posterior tooth poisition for height of plane, relation of plane to alatragus line, tongue room, and ridge relation. e. Anterior tooth position for lip support, length, and relation to lower lip. f. Entire setup for vertical dimension of the face, test balance and simultaneous tooth contacts in all desired positions. If discrepancies exist between the articulator and the mouth, make new jaw relation records. g. Check palatal contour and incisor positions in speaking. "F" and "V" sounds to test the upper incisor, sibilant sounds for vertical dimension and lower-to-upper incisal relationships. h. Wax-up for support and proper external form. If tori exist on upper or lower, be sure there is sufficient thickness to allow relief later on. i. Be sure to repeat and continue instruction of the patient in his understanding and handling of the new dentures. Now, in addition to all these checks to dentist makes, he must constantly anticipate the thoughts and attitudes of the patient and interpret them for better rapport and ultimate patient understanding. No stage in complete dentures is anticipated with such mixed emotions as is the try-in. No stage is so significant to the future success or failure of the patient to take dentures in his stride. No stage has so much potential for making the person happy or sinking him into the depths of despair. The return of self-confidence, the pride in appearance, the sparkle and drive that return to a patient when the restorations are enthusiastically accepted are a wonderful reward for dentistry well done. PMID:321277

Payne, S H

1977-04-01

98

Effect of Patient's Personality on Satisfaction with Their Present Complete Denture and after Increasing the Occlusal Vertical Dimension: A Study of Edentulous Egyptian Patients  

PubMed Central

Complete denture wearers often find it difficult to accept a new denture. Personality traits are among the factors that possibly affect patient satisfaction with a complete denture. Our aim was to investigate the influence of patients' personality on satisfaction with their present denture and after an increase in the occlusal vertical dimension (OVD). Sixty edentulous patients with complete dentures (22 men and 38 women, mean age 66 years, and range 50–75 years) participated in the study. The age of their complete dentures ranged from 5 to 16 years. Patients' personalities were evaluated using the Arabic version of the Eysenck Personality Questionnaire. Their satisfaction with their dentures before and after restoration of the OVD and relining of the mandibular denture was evaluated using two questionnaires (I and II), Patients with a high score of neuroticism were less satisfied with their original dentures and after relining and an increase of OVD compared with patients with an average score in that trait. The personality trait of psychoticism was significant to patients' acceptance of an increase in OVD; that is, patients with a high score were less satisfied with their dentures after increase of OVD than patients with an average score. It is concluded that personality traits affect patients' acceptance of their complete dentures. PMID:25110475

Fouda, Shaimaa M.; Al-Attar, Mohamed S.; Virtanen, Jorma I.; Raustia, Aune

2014-01-01

99

Effect of Patient's Personality on Satisfaction with Their Present Complete Denture and after Increasing the Occlusal Vertical Dimension: A Study of Edentulous Egyptian Patients.  

PubMed

Complete denture wearers often find it difficult to accept a new denture. Personality traits are among the factors that possibly affect patient satisfaction with a complete denture. Our aim was to investigate the influence of patients' personality on satisfaction with their present denture and after an increase in the occlusal vertical dimension (OVD). Sixty edentulous patients with complete dentures (22 men and 38 women, mean age 66 years, and range 50-75 years) participated in the study. The age of their complete dentures ranged from 5 to 16 years. Patients' personalities were evaluated using the Arabic version of the Eysenck Personality Questionnaire. Their satisfaction with their dentures before and after restoration of the OVD and relining of the mandibular denture was evaluated using two questionnaires (I and II), Patients with a high score of neuroticism were less satisfied with their original dentures and after relining and an increase of OVD compared with patients with an average score in that trait. The personality trait of psychoticism was significant to patients' acceptance of an increase in OVD; that is, patients with a high score were less satisfied with their dentures after increase of OVD than patients with an average score. It is concluded that personality traits affect patients' acceptance of their complete dentures. PMID:25110475

Fouda, Shaimaa M; Al-Attar, Mohamed S; Virtanen, Jorma I; Raustia, Aune

2014-01-01

100

Tear analysis in contact lens wearers.  

PubMed Central

Tear analysis in contact lens wearers was compared with tear analysis in aphakics without contact lens wear and normal phakic patients. Subjects were divided into five groups: group 1, aphakic without contact lens; group 2, phakic with daily-wear hard contact lens; group 3, phakic with daily-wear soft contact lens; group 4, phakic with extended-wear soft contact lens; and group 5, aphakic with extended-wear soft contact lens. The experimental groups were compared with age- and sex-matched control groups for statistical analysis of tear variables by means of the Student's t-test. The variables measured were tear osmolarity, tear albumin, and lysozyme and lactoferrin concentrations in basal and reflex tears. Highly significant elevations of tear osmolarity were found in aphakic subjects without contact lenses. Less significant differences in tear osmolarity were found in phakic subjects with hard daily-wear lenses or with extended-wear soft lenses. Tear albumin, lysozyme, and lactoferrin in basal and reflex tears were not significantly different in the different groups of contact lens wearers or in the group of aphakic subjects without contact lenses compared with their control groups. Individual variations in tear albumin, lysozyme, and lactoferrin appeared to be responsible for the inability to demonstrate significant differences in tear composition in association with the wearing of different types of contact lenses. Older and aphakic patients demonstrated a tendency to have increased concentrations of proteins in the tears compared with younger, phakic contact lens wearers and normal controls without contact lenses. PMID:3914131

Farris, R L

1985-01-01

101

A cross-over randomised clinical trial of eccentric occlusion in complete dentures.  

PubMed

The objective of this study is to compare the effects of canine guidance (CG) and bilateral balanced occlusion (BBO) on denture satisfaction and kinesiographic parameters of complete denture wearers, by means of a cross-over trial. Fifty edentulous patients received new maxillary and mandibular complete dentures. After the intra-oral adjustments and adaptation period, 44 participants were enrolled in the trial and randomly received a sequence of occlusal schemes: BBO followed by CG, or CG followed by BBO. Outcomes were assessed after 30 days of each occlusal scheme. Participants answered a denture satisfaction questionnaire and a kinesiograph instrument recorded mandibular physiologic movements and pattern of maxillary denture movement during chewing. Wilcoxon test and paired sample t-test were used to compare satisfaction levels and kinesiographic data for each occlusal scheme, respectively (?=0.05). The results showed no differences between occlusal schemes on participant's satisfaction and in any of the kinesiographic parameters studied, except for the vertical intrusion of the maxillary complete denture during chewing, which was lower with CG. It can be concluded that the occlusal scheme did not influence on satisfaction and kinesiographic parameters evaluated, as long as volume and resilience of residual edentulous ridges of the participants were normal. Clinical Trial Registration Identifier: NC.T01420536. PMID:22486470

Paleari, A G; Marra, J; Rodriguez, L S; de Souza, R F; Pero, A C; Mollo, F de A; Compagnoni, M A

2012-08-01

102

Sanitization of dentures by several denture hygiene methods.  

PubMed

Denture sanitization is an important element in the treatment of denture stomatitis and should be emphasized in instructions to patients. A two-part study was designed to compare the efficacy of eight denture-cleaning methods in removing and/or killing aerobes, anaerobes, and yeasts on dentures. Part I tested the effectiveness of the cleaners on a pure yeast culture of C. albicans. Part II tested the various denture sanitization techniques under actual clinical conditions. The following conclusions were made from the information obtained in this study: Miller's and Kleenite were the most effective sanitizing agents. Brushing the denture with soap and water and soaking the denture in the cleaner Mersene were effective to a lesser degree. Although Clorox and Calgon was effective at killing yeast under in vitro conditions, it was not effective under clinical conditions. The other denture cleaners were not found to be effective under the clinical conditions of this study for the removal and/or killing of any of the three microorganism groups cultured. In the past, the function of denture cleaners has been to remove deposits and stains from dentures. With the present knowledge of the role of microorganisms in the etiology of denture stomatitis, more emphasis should be placed on the ability of denture cleaners to sanitize dentures. PMID:6381698

Moore, T C; Smith, D E; Kenny, G E

1984-08-01

103

Antifungal activity, biofilm-controlling effect, and biocompatibility of poly(N-vinyl-2-pyrrolidinone)-grafted denture materials  

PubMed Central

Colonization and biofilm-formation of Candida species on denture surfaces cause Candida-associated denture stomatitis (CADS), a common, recurring disease affecting up to 67% of denture wearers. We developed poly(N-vinyl-2-pyrrolidinone)-grafted denture materials that can be repeatedly recharged with various antifungal drugs to achieve long-term antifungal and biofilm-controlling effects. The monomer, N-vinyl-2-pyrrolidinone (NVP), was grafted onto poly(methyl methacrylate) denture resins through plasma-initiated grafting polymerization. The physical properties and biocompatibility of the resulting resins were not negatively affected by the presence of up to 7.92% of grafted poly (N-vinyl-2-pyrrolidinone) (PNVP). Miconazole and chlorhexidine digluconate (CD) were used as model antifungal drugs. PNVP grafting significantly increased the drug absorption capability of the resulting denture materials. Further, the new materials showed sustained drug release and provided antifungal effects for weeks (in the case of CD) to months (in the case of miconazole). The drug-depleted resins could be recharged with the same or a different class of antifungal drug to further extend antifungal duration. If needed, drugs on the PNVP-grafted denture materials could be “washed out” (quenched) by treating with PNVP aqueous solutions to stop drug release. These results point to great potentials of the new materials in controlling biofilm-formation in a wide range of device-related applications. PMID:23708753

Sun, Xinbo; Cao, Zhengbing; Yeh, Chih-Ko; Sun, Yuyu

2013-01-01

104

Inhibiting microbial adhesion to denture base acrylic resin by titanium dioxide coating.  

PubMed

Mechanical cleaning of dentures is effective in preventing infections such as aspiration pneumonia and denture stomatitis. For denture wearers with a physical handicap and the elderly, however, mechanical cleaning can present problems. The aim of this study was to investigate the effect of coating denture base acrylic resin with titanium dioxide (TiO(2)) in the inhibition of oral microbial adhesion. We prepared uniformly sized acrylic resin plates (10 mm x 10 mm x 0.5 mm), which were divided into two groups (a non-coated group and a TiO(2)-coated group). The plates were immersed in cultured Streptococcus sanguinis or Candida albicans and incubated for 24 h. After incubation, each plate was washed to remove loosely adherent microorganisms, and then incubated for a further 24 h. Adenosine triphosphate (ATP) content of the microorganisms was evaluated using a reagent containing benzalkonium, which extracts intra-cellular ATP. In addition, to determine biofilm formation, we also observed each plate by scanning electron microscopy (SEM). We found that the ATP content of both S. sanguinis and C. albicans was reduced by the TiO(2) coating (P = 0.000). Observation by SEM confirmed that the TiO(2) coating inhibited biofilm formation. The results indicate that a TiO(2) coating on a denture base acrylic resin inhibits adhesion of S. sanguinis and C. albicans. PMID:19941590

Arai, T; Ueda, T; Sugiyama, T; Sakurai, K

2009-12-01

105

Living with Your Dentures  

MedlinePLUS

... this. Speaking Many people feel as if their mouths are full of marbles when they put in their dentures the first few times. You will most likely need to practice speaking. Do this by reading aloud, slowly and quietly, when you are at ...

106

Prevalence of the microbiologic flora in contact lens wearers at the Puerto Rico Medical Center.  

PubMed

The prevalence of microbioogic flora was determined in a convenience sample of contact lens wearers at the Puerto Rico Medical Center, ophthalmology clinics obtaining cultures from the conjunctival fornices. Gram positive bacterial prevalence was 100% in the control group, as well as in rigid gas permeable lens wearers. In the soft contact lens group, gram positive bacterial prevalence was 94.7%. On the other hand prevalence of Gram negative bacteria is null in the soft contact lens wearer population, being only 2.5% in control group, and 45.5% for Rigid Gas Permeable wearers. These contact lens wearers were using different disinfection systems. PMID:1854385

Izquierdo, N; Díaz Mendoza, S; Townsend, W; Carro, J

1991-03-01

107

Alternatives to traditional complete dentures.  

PubMed

Specific alternatives to traditional complete denture therapy have been controversial because of the uncertainties surrounding effectiveness of retention. This article addresses the importance of retention, border molding, diagnosis, and treatment planning, and the meticulous attention to detail required throughout the treatment course of these alternative modalities. Indications, advantages, and limitations are also presented. Although these alternatives are not routinely used in making complete dentures, they have been successfully used for the treatment of the edentulous patient. Alternatives serve as valuable prosthodontic treatment options that greatly enhance denture aesthetics, and should be considered for edentulous patients. PMID:24286647

Olvera, Norma; Jones, John D

2014-01-01

108

Multifunctional Smart Denture That Remotely Monitors Health  

E-print Network

Multifunctional Smart Denture That Remotely Monitors Health The University of Florida is seeking companies interested in commercializing a multifunctional smart denture that monitors health. Twenty. Because dentures are only supported by tissues in the oral cavity, not anchored into the jaw bone, keeping

Slatton, Clint

109

The physical properties of a polyacetal denture resin.  

PubMed

A polyacetal injection-moulded resin is being marketed for the construction of retentive and supportive components of removable partial dentures (RPDs). Specimens of poly(oxymethylene) cast by commercial laboratories were tested to examine the following physical characteristics: the modulus of elasticity in compression, extension and flexure, stress relaxation, the force displacement behaviour of clasp forms, impact strength and glass transition temperature. Results showed that the material has a flexural modulus lower than that of poly(methylmethacrylate) and is insufficiently rigid to be used as a supporting element for partial dentures. Resin clasps may be resilient enough to engage undercuts for the retention of RPDs but the low flexural modulus requires that the resin be used in greater cross-sectional area than metal alloys in order to gain useful retention. This greater bulk has implications for plaque accumulation and maintenance of periodontal health. PMID:10150599

Fitton, J S; Davies, E H; Howlett, J A; Pearson, G J

1994-01-01

110

21 CFR 872.3580 - Preformed gold denture tooth.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Preformed gold denture tooth. 872.3580 Section 872...Prosthetic Devices § 872.3580 Preformed gold denture tooth. (a) Identification. A preformed gold denture tooth is a device composed of...

2013-04-01

111

21 CFR 872.3580 - Preformed gold denture tooth.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Preformed gold denture tooth. 872.3580 Section 872...Prosthetic Devices § 872.3580 Preformed gold denture tooth. (a) Identification. A preformed gold denture tooth is a device composed of...

2010-04-01

112

21 CFR 872.3580 - Preformed gold denture tooth.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 2012-04-01 false Preformed gold denture tooth. 872.3580 Section 872...Prosthetic Devices § 872.3580 Preformed gold denture tooth. (a) Identification. A preformed gold denture tooth is a device composed of...

2012-04-01

113

21 CFR 872.3580 - Preformed gold denture tooth.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 2011-04-01 false Preformed gold denture tooth. 872.3580 Section 872...Prosthetic Devices § 872.3580 Preformed gold denture tooth. (a) Identification. A preformed gold denture tooth is a device composed of...

2011-04-01

114

21 CFR 872.3580 - Preformed gold denture tooth.  

...2014-04-01 2014-04-01 false Preformed gold denture tooth. 872.3580 Section 872...Prosthetic Devices § 872.3580 Preformed gold denture tooth. (a) Identification. A preformed gold denture tooth is a device composed of...

2014-04-01

115

Robotic Manufacturing of Complete Dentures  

Microsoft Academic Search

Although many medical robots have been developed, such as surgical robots, nurse robots, etc., very few robots are introduced in the research field of oral restoration, especially false-teeth restoration. Currently, false-teeth restoration is done manually. Robotic manufacturing system of complete dentures is described in this paper, which performs a complete false teeth automatic implanting. It relies on the use of

Yongde Zhang; Zhanfang Zhao; Jilian Lu; Shiu Kit Tso

2001-01-01

116

Denture identification marking should be standard practice.  

PubMed

The focus of this opinion article is to revisit whether denture identification marking should be routine and standard practice at manufacture in the United Kingdom. The benefits of denture identification marking are evident in the literature particularly for those who are in residential care or who will have to seek care due to dementia or physical frailty; however, within the UK it is not normally practised. Many patients would appear to be unaware of denture marking, but present positive attitudes towards it. Results of a survey of UK dental laboratories would indicate that the vast majority of them offer an inclusion denture marking service with a mean cost of £5 per denture. Is the lack of denture marking in the UK due to dental professionals having differences in opinion, lack of education of professionals in training or financial disincentives? PMID:24923933

Kalyan, A; Clark, R K F; Radford, D R

2014-06-13

117

[Effects of removable plate dentures made of acrylic plastic on the structure and function of oral mucosal cell membranes].  

PubMed

The results of orthodontic treatment of 120 patients with complete and partial adentia are presented. The patients were fitted with removable plate dentures on the base of acrylic polymers trevalon, fluorax, ethacryl, and redont. The results of biochemical and morphological studies recommend the basic material trevalon for practical orthodontics. Measurements of medium molecular weight oligopeptides, histamine, malonic dialdehyde, and activities of antioxidant enzymes are recommended for predicting the time and quality of patients' adaptation to removable plate dentures from acrylic polymers. PMID:12772560

Lepilin, A V; Rubin, V I; Proshin, A G

2003-01-01

118

Immediate denture fabrication: a clinical report  

PubMed Central

Summary The aim of the present clinical report was to describe the use of a patient’s extensive fixed prosthesis, where the supporting teeth were hopeless, for fabricating an interim immediate complete denture. The present procedure was used to replicate the vertical dimension, phonetic and aesthetic of the existing fixed prostheses as part of an immediate denture and a final complete denture. PMID:24611094

Caputi, Sergio; Murmura, Giovanna; Ricci, Laura; Varvara, Giuseppe; Sinjari, Bruna

2013-01-01

119

The efficacy of denture cleansers.  

PubMed

The efficacy of two soaking cleansers, a toothbrush/paste and a brush with soap and water have been compared in relation to their ability to remove three types of soil from dentures. A 4 week cross-over trial involving a panel of 80 volunteers was used. Each denture was scored for stain, calculus and disclosed plaque, both before and after cleaning with one of the chosen cleaners. A soaking cleanser used at 50 degrees C was more effective than the other products at removing plaque and stain. There was no difference amongst the materials in terms of calculus removal, the scores being low in all cases. The reliability of scoring is influenced by the presence of large numbers of low 'before-cleaning' scores. This problem can be overcome by using a selection criterion which requires a certain minimum level of soil to be present before cleaning. PMID:8603160

McCabe, J F; Murray, I D; Kelly, P J

1995-09-01

120

Rechargeable Infection-responsive Antifungal Denture Materials  

PubMed Central

Candida-associated denture stomatitis (CADS) is a significant clinical concern. We developed rechargeable infection-responsive antifungal denture materials for potentially managing the disease. Polymethacrylic acid (PMAA) was covalently bound onto diurethane dimethacrylate denture resins in the curing step. The PMAA resins bound cationic antifungal drugs such as miconazole and chlorhexidine digluconate (CG) through ionic interactions. The anticandidal activities of the drug-containing PMAA-resin discs were sustained for a prolonged period of time (weeks and months). Drug release was much faster at acidic conditions (pH 5) than at pH 7. Drugs bound to the denture materials could be “washed out” by treatment with EDTA, and the drug-depleted resins could be recharged with the same or a different class of anticandidal drugs. These results suggest clinical potential of the newly developed antifungal denture materials in the management of CADS and other infectious conditions. PMID:20940361

Cao, Z.; Sun, X.; Yeh, C.-K.; Sun, Y.

2010-01-01

121

New Progressive Addition Lens Design: Utilizing the Varilux Ipseo Lens for Non-Adapt PAL Wearers  

Microsoft Academic Search

A progressive addition lens (PAL) is a seamless multifocal lens with the distance power in the top half of the lens that gradually increases in power as the wearer looks down into the bottom portion of the lens. This design allows for clear distance, intermediate and near vision. In order to achieve this lens design, unwanted astigmatism is created in

Jennifer Wong

2006-01-01

122

Relationship between plasticizer content and tensile bond strength of soft denture liners to a denture base resin.  

PubMed

The purpose of this study was to determine the influence of plasticizer content on the tensile bond strength of heat-cured acrylic soft denture liners to a denture base resin. Differences among materials were significant, except for 100 wt% Dibutyl Sebacate (DBS) and 80 wt% DBS of tensile bond strength. The bond strength of all materials to the denture base increased with an increase in thermal cycles significantly except for 40 wt% DBS. The tensile bond strength of soft denture liners to the denture base resin significantly decreased with an increase of plasticizer contents. Differences were found among the difference plasticizer contents in failure types between the denture base resin and soft denture liners. The results suggest that the tensile bond strengths of heat-cured acrylic soft denture liners to the denture base resin were lower with an increase in plasticizer content. PMID:15287552

Hong, Guang; Murata, Hiroshi; Hamada, Taizo

2004-06-01

123

[Effects of wearing complete dentures on swallowing in the elderly].  

PubMed

The purpose of this study was to evaluate effects of wearing complete dentures on swallowing in the elderly. Sixteen nondysphagic edentulous volunteers (mean age: 75.0 yrs) were studied in terms of surface electromyography of the anterior belly of digastrics and masseter muscles, tongue pressure toward the hard palate, and the laryngeal movement. The subjects swallowed 2 ml water under four conditions, with upper and lower dentures, without lower denture, without upper denture, and without upper and lower dentures. Dipper-type of swallowing was prescribed. A repeated-measures ANOVA was used for statistical analysis. Total swallowing duration and the latent period until laryngeal elevation were significantly prolonged without upper or lower denture, and without both dentures (p < 0.05). They were significantly shorter without lower denture than those without upper denture, and without both dentures (p < 0.05). Duration of the preparatory stage was significantly prolonged without upper denture, and without both dentures comparing with the others (p < 0.05). Duration of the oral stage was significantly prolonged without upper denture, and without both dentures comparing with the duration with both dentures (p < 0.05). There were no changes in the pharyngeal stage with or without dentures. The prolongation of total swallowing duration was due to the prolongation of the preparatory and oral stages. The prolongation of swallowing would affect the oral-pharyngeal coordination of swallowing, and exacerbate the depression of swallowing functions with aging. These results suggested that wearing complete dentures contributes to maintain physiological procedure of swallowing in the elderly. PMID:10655703

Furuya, J

1999-12-01

124

21 CFR 872.3300 - Hydrophilic resin coating for dentures.  

Code of Federal Regulations, 2010 CFR

... MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3300 Hydrophilic...coating for dentures is a device that consists of a water-retaining polymer that...mouth to improve denture retention and comfort. (b)...

2010-04-01

125

21 CFR 872.3300 - Hydrophilic resin coating for dentures.  

... MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3300 Hydrophilic...coating for dentures is a device that consists of a water-retaining polymer that...mouth to improve denture retention and comfort. (b)...

2014-04-01

126

21 CFR 872.3300 - Hydrophilic resin coating for dentures.  

Code of Federal Regulations, 2011 CFR

... MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3300 Hydrophilic...coating for dentures is a device that consists of a water-retaining polymer that...mouth to improve denture retention and comfort. (b)...

2011-04-01

127

21 CFR 872.3300 - Hydrophilic resin coating for dentures.  

Code of Federal Regulations, 2013 CFR

... MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3300 Hydrophilic...coating for dentures is a device that consists of a water-retaining polymer that...mouth to improve denture retention and comfort. (b)...

2013-04-01

128

21 CFR 872.3300 - Hydrophilic resin coating for dentures.  

Code of Federal Regulations, 2012 CFR

... MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3300 Hydrophilic...coating for dentures is a device that consists of a water-retaining polymer that...mouth to improve denture retention and comfort. (b)...

2012-04-01

129

21 CFR 872.3530 - Mechanical denture cleaner.  

Code of Federal Regulations, 2011 CFR

...AC-powered, that consists of a container for mechanically agitating a denture cleansing solution. The device is intended to clean a denture by submersion in the agitating cleansing solution in the container. (b) Classification. Class I...

2011-04-01

130

21 CFR 872.3530 - Mechanical denture cleaner.  

Code of Federal Regulations, 2010 CFR

...AC-powered, that consists of a container for mechanically agitating a denture cleansing solution. The device is intended to clean a denture by submersion in the agitating cleansing solution in the container. (b) Classification. Class I...

2010-04-01

131

21 CFR 872.3530 - Mechanical denture cleaner.  

...AC-powered, that consists of a container for mechanically agitating a denture cleansing solution. The device is intended to clean a denture by submersion in the agitating cleansing solution in the container. (b) Classification. Class I...

2014-04-01

132

21 CFR 872.3530 - Mechanical denture cleaner.  

Code of Federal Regulations, 2013 CFR

...AC-powered, that consists of a container for mechanically agitating a denture cleansing solution. The device is intended to clean a denture by submersion in the agitating cleansing solution in the container. (b) Classification. Class I...

2013-04-01

133

21 CFR 872.3530 - Mechanical denture cleaner.  

Code of Federal Regulations, 2012 CFR

...AC-powered, that consists of a container for mechanically agitating a denture cleansing solution. The device is intended to clean a denture by submersion in the agitating cleansing solution in the container. (b) Classification. Class I...

2012-04-01

134

Effect of incorporation of 2-tert-butylaminoethyl methacrylate on flexural strength of a denture base acrylic resin  

PubMed Central

Polymethyl methacrylate (PMMA) resins have commonly been used as a denture base material. However, denture bases may act as a reservoir for microorganisms and contribute to oral diseases in denture wearers. It is hypothesized that the 2-tertbutylaminoethyl methacrylate (TBAEMA) incorporated to acrylic resins should have antimicrobial activity related to the presence of amino groups on acrylic resin surface. Objectives The objectives of this study were to evaluate the presence of amino groups on acrylic resin surface and the influence on flexural strength after incorporation of TBAEMA. Material and Methods Six groups were divided according to the concentration of TBAEMA incorporated to acrylic resin (Lucitone 550): 0, 0.5, 1.0, 1.5, 1.75 and 2%. Specimens surface were evaluated by electron Spectroscopy for Chemical Analysis (ESCA) to detect the presence of amino groups, represented by nitrogen ratios. Flexural strength of the specimens was tested and results were analyzed by ANOVA and Tukey's test (?=0.05). Results Different nitrogen ratios were observed on specimen surfaces: 0, 0.13, 0.74, 0.66, 0.92 and 0.33% for groups 0, 0.5, 1.0, 1.5, 1.75, and 2%, respectively. Significant differences were found for flexural strength (p<0.001). The mean flexural strength values were 98.3±3.9, 93.3±3.2, 83.9±2.1, 82.8±5.2, 71.2±5.1 and 17.3±3.2 MPa for groups 0, 0.5, 1.0, 1.5, 1.75, and 2%, respectively. Conclusion Within the limitations of this study, the incorporation of TBAEMA results in the presence of the potentially antimicrobial amino groups on specimen surfaces, but affect the flexural strength, depending on the concentration of TBAEMA. PMID:21625732

PALEARI, André Gustavo; MARRA, Juliê; PERO, Ana Carolina; RODRIGUEZ, Larissa Santana; RUVOLO-FILHO, Adhemar; COMPAGNONI, Marco Antonio

2011-01-01

135

Light weight dentures: An innovative technique  

PubMed Central

Retention, stability and support are the basic principles on which the success of a complete denture relies. The severely resorbed maxillary and mandibular edentulous arches that are narrow and constricted with increased interarch space provide decreased support, retention and stability. To decrease the leverage, reduction in the weight of the prosthesis was recommended and also found beneficial. This article describes a simple procedure to reduce the weight of maxillary complete denture by use of an autopolymerizing acrylic resin shell which is incorporated during the packing stage. This method has the advantage of being easy and requires very little additional time. Hollow maxillary complete denture considerably reduces the weight of the prosthesis, which in turn prevents transmission of detrimental forces by reducing leverage action. This results in increased retention and stability and up to some extent it also preserves the existing residual alveolar ridge. The technique uses a clear matrix of trial denture to facilitate shaping of dough spacer to ensure an even thickness of acrylic to resist deformation and prevent seepage of saliva into the cavity making this technique more predictable. An autopolymerizing acrylic resin shell which creates hollow space and also has strength. Technique is simple to execute, easy economical and matching the shade of autopolymerizing acrylic resin with heat cures acrylic resin enhances esthetics. Light weight hollow dentures provide healthy and comfortable living for the geriatric edentulous patient. PMID:24808715

Gundawar, Sham; Zamad, Aakanksha; Gundawar, Sneha

2014-01-01

136

Distinguishing between perceiver and wearer effects in clothing color-associated attributions.  

PubMed

Recent studies have noted positive effects of red clothing on success in competitive sports, perhaps arising from an evolutionary predisposition to associate the color red with dominance status. Red may also enhance judgments of women's attractiveness by men, perhaps through a similar association with fertility. Here we extend these studies by investigating attractiveness judgments of both sexes and by contrasting attributions based on six different colors. Furthermore, by photographing targets repeatedly in different colors, we could investigate whether color effects are due to influences on raters or clothing wearers, by either withholding from raters information about clothing color or holding it constant via digital manipulation, while retaining color-associated variation in wearer's expression and posture. When color cues were available, we found color-attractiveness associations when males were judged by either sex, or when males judged females, but not when females judged female images. Both red and black were associated with higher attractiveness judgments and had approximately equivalent effects. Importantly, we also detected significant clothing color-attractiveness associations even when clothing color was obscured from raters and when color was held constant by digital manipulation. These results suggest that clothing color has a psychological influence on wearers at least as much as on raters, and that this ultimately influences attractiveness judgments by others. Our results lend support for the idea that evolutionarily-derived color associations can bias interpersonal judgments, although these are limited neither to effects on raters nor to the color red. PMID:22947805

Roberts, S Craig; Owen, Roy C; Havlicek, Jan

2010-01-01

137

[Experimental basis of a new material for the manufacture of bases dentures].  

PubMed

The author studied the problem of improving the quality of prosthetic removable prostheses through the development of new basic material based on polypropylene copolymer. To this end, we examined the physical and chemical structure and hygienic properties of the produced material. The studies found that the developed material of polypropylene optimal solution for the partial plate denture bases, without flaws acrylic prosthesis and improves the properties of the previously used polypropylene plastics. PMID:24214589

Shturminski?, V G

2013-10-01

138

Stabilized record bases for complete dentures.  

PubMed

A step-by-step technique has been described to construct stabilized record bases which allows the dentist to take advantage of undercuts through the use of a resilient denture liner material in the undercut regions. The resilient denture liner material protects the rugae and prevents damage to the casts in the undercut regions during repeated placing and removal from the cast. Shellac denture base material at the posterior limit of the record base permits an easy method of checking the posterior palatal seal. The incorporation of the posterior palatal seal in the record base allows for adequate retention during the recording of the maxillomandibular jaw relation records and try-in procedures. The record bases made by the sprinkle-on technique are preferred to those made using the dough method. The bases are rigid, stable, not easily broken or warped, and fit accurately. PMID:290809

Klein, I E; Soni, A

1979-11-01

139

Improvdent: Improving dentures for patient benefit. A crossover randomised clinical trial comparing impression materials for complete dentures  

PubMed Central

Background According to the UK Adult Dental Health Survey (2009) 15% of adults aged 65–74, 30% aged 75–84 and 47% aged >85 years are edentulous and require complete dentures. Patients’ quality of life and nutrition status are affected by poor dentures. The quality of the dental impression is the most important issue for improving the fit and comfort of new dentures. There is paucity of RCT evidence for which impression material is best for complete dentures construction. This study aims to compare two impression materials for effectiveness and cost effectiveness. Methods/Design IMPROVDENT is a double-blind crossover trial comparing the use of alginate and silicone, two commonly used denture impression materials, in terms of patient preference and cost-effectiveness. Eighty five edentulous patients will be recruited and provided with two sets of dentures, similar in all aspects except for the impression material used (alginate or silicone). Patients will try both sets of dentures for a two-week period, unadjusted, to become accustomed to the feel of the new dentures (habituation period). Patients will then wear each set of dentures for a period of 8 weeks (in random order) during which time the dentures will be adjusted for optimum comfort. Finally, patients will be given both sets of dentures for a further two weeks to wear whichever denture they prefer (confirmation period). Patients will be asked about quality of life and to rate dentures on function and comfort at the end of each trial period and asked which set they prefer at the end of the habituation period (unadjusted denture preference) and confirmation period (adjusted denture preference). A health economic evaluation will estimate incremental cost-effectiveness ratios of producing dentures from the two materials. A qualitative study will investigate the impact of dentures on behaviour and quality of life. Funding: IMPROVDENT is funded by NIHR RfPB (PB-PG-0408-16300). Discussion This trial aims to provide evidence on the costs and quality of dentures cast from two different commonly used impression materials; the intention is to significantly impact on the quality of denture production within NHS dentistry. Trial Registration ISRCTN Register: ISRCTN01528038 UKCRN Portfolio ID: 8305 PMID:22937901

2012-01-01

140

21 CFR 872.3400 - Karaya and sodium borate with or without acacia denture adhesive.  

Code of Federal Regulations, 2012 CFR

...borate with or without acacia denture adhesive. 872.3400 Section 872.3400...borate with or without acacia denture adhesive. (a) Identification. A karaya...borate with or without acacia denture adhesive is a device composed of karaya...

2012-04-01

141

21 CFR 872.3410 - Ethylene oxide homopolymer and/or carboxymethylcellulose sodium denture adhesive.  

Code of Federal Regulations, 2013 CFR

...carboxymethylcellulose sodium denture adhesive. 872.3410 Section 872.3410...carboxymethylcellulose sodium denture adhesive. (a) Identification. An ethylene...carboxymethylcellulose sodium denture adhesive is a device containing ethylene...

2013-04-01

142

21 CFR 872.3400 - Karaya and sodium borate with or without acacia denture adhesive.  

Code of Federal Regulations, 2010 CFR

...borate with or without acacia denture adhesive. 872.3400 Section 872.3400...borate with or without acacia denture adhesive. (a) Identification. A karaya...borate with or without acacia denture adhesive is a device composed of karaya...

2010-04-01

143

21 CFR 872.3420 - Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive.  

Code of Federal Regulations, 2013 CFR

...cationic polyacrylamide polymer denture adhesive. 872.3420 Section 872.3420...cationic polyacrylamide polymer denture adhesive. (a) Identification. A carboxymethylcellulose...cationic polyacrylamide polymer denture adhesive is a device composed of...

2013-04-01

144

21 CFR 872.3410 - Ethylene oxide homopolymer and/or carboxymethylcellulose sodium denture adhesive.  

Code of Federal Regulations, 2012 CFR

...carboxymethylcellulose sodium denture adhesive. 872.3410 Section 872.3410...carboxymethylcellulose sodium denture adhesive. (a) Identification. An ethylene...carboxymethylcellulose sodium denture adhesive is a device containing ethylene...

2012-04-01

145

21 CFR 872.3410 - Ethylene oxide homopolymer and/or carboxymethylcellulose sodium denture adhesive.  

Code of Federal Regulations, 2010 CFR

...carboxymethylcellulose sodium denture adhesive. 872.3410 Section 872.3410...carboxymethylcellulose sodium denture adhesive. (a) Identification. An ethylene...carboxymethylcellulose sodium denture adhesive is a device containing ethylene...

2010-04-01

146

21 CFR 872.3420 - Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive.  

...cationic polyacrylamide polymer denture adhesive. 872.3420 Section 872.3420...cationic polyacrylamide polymer denture adhesive. (a) Identification. A carboxymethylcellulose...cationic polyacrylamide polymer denture adhesive is a device composed of...

2014-04-01

147

21 CFR 872.3400 - Karaya and sodium borate with or without acacia denture adhesive.  

Code of Federal Regulations, 2011 CFR

...borate with or without acacia denture adhesive. 872.3400 Section 872.3400...borate with or without acacia denture adhesive. (a) Identification. A karaya...borate with or without acacia denture adhesive is a device composed of karaya...

2011-04-01

148

21 CFR 872.3480 - Polyacrylamide polymer (modified cationic) denture adhesive.  

Code of Federal Regulations, 2012 CFR

...polymer (modified cationic) denture adhesive. 872.3480 Section 872.3480...polymer (modified cationic) denture adhesive. (a) Identification. A polyacrylamide polymer (modified cationic) denture adhesive is a device composed of...

2012-04-01

149

21 CFR 872.3450 - Ethylene oxide homopolymer and/or karaya denture adhesive.  

Code of Federal Regulations, 2012 CFR

...oxide homopolymer and/or karaya denture adhesive. 872.3450 Section 872.3450...oxide homopolymer and/or karaya denture adhesive. (a) Identification. Ethylene oxide homopolymer and/or karaya denture adhesive is a device composed of...

2012-04-01

150

21 CFR 872.3400 - Karaya and sodium borate with or without acacia denture adhesive.  

...borate with or without acacia denture adhesive. 872.3400 Section 872.3400...borate with or without acacia denture adhesive. (a) Identification. A karaya...borate with or without acacia denture adhesive is a device composed of karaya...

2014-04-01

151

21 CFR 872.3450 - Ethylene oxide homopolymer and/or karaya denture adhesive.  

...oxide homopolymer and/or karaya denture adhesive. 872.3450 Section 872.3450...oxide homopolymer and/or karaya denture adhesive. (a) Identification. Ethylene oxide homopolymer and/or karaya denture adhesive is a device composed of...

2014-04-01

152

21 CFR 872.3450 - Ethylene oxide homopolymer and/or karaya denture adhesive.  

Code of Federal Regulations, 2010 CFR

...oxide homopolymer and/or karaya denture adhesive. 872.3450 Section 872.3450...oxide homopolymer and/or karaya denture adhesive. (a) Identification. Ethylene oxide homopolymer and/or karaya denture adhesive is a device composed of...

2010-04-01

153

21 CFR 872.3480 - Polyacrylamide polymer (modified cationic) denture adhesive.  

...polymer (modified cationic) denture adhesive. 872.3480 Section 872.3480...polymer (modified cationic) denture adhesive. (a) Identification. A polyacrylamide polymer (modified cationic) denture adhesive is a device composed of...

2014-04-01

154

21 CFR 872.3400 - Karaya and sodium borate with or without acacia denture adhesive.  

Code of Federal Regulations, 2013 CFR

...borate with or without acacia denture adhesive. 872.3400 Section 872.3400...borate with or without acacia denture adhesive. (a) Identification. A karaya...borate with or without acacia denture adhesive is a device composed of karaya...

2013-04-01

155

21 CFR 872.3410 - Ethylene oxide homopolymer and/or carboxymethylcellulose sodium denture adhesive.  

...carboxymethylcellulose sodium denture adhesive. 872.3410 Section 872.3410...carboxymethylcellulose sodium denture adhesive. (a) Identification. An ethylene...carboxymethylcellulose sodium denture adhesive is a device containing ethylene...

2014-04-01

156

21 CFR 872.3480 - Polyacrylamide polymer (modified cationic) denture adhesive.  

Code of Federal Regulations, 2013 CFR

...polymer (modified cationic) denture adhesive. 872.3480 Section 872.3480...polymer (modified cationic) denture adhesive. (a) Identification. A polyacrylamide polymer (modified cationic) denture adhesive is a device composed of...

2013-04-01

157

21 CFR 872.3450 - Ethylene oxide homopolymer and/or karaya denture adhesive.  

Code of Federal Regulations, 2013 CFR

...oxide homopolymer and/or karaya denture adhesive. 872.3450 Section 872.3450...oxide homopolymer and/or karaya denture adhesive. (a) Identification. Ethylene oxide homopolymer and/or karaya denture adhesive is a device composed of...

2013-04-01

158

21 CFR 872.3410 - Ethylene oxide homopolymer and/or carboxymethylcellulose sodium denture adhesive.  

Code of Federal Regulations, 2011 CFR

...carboxymethylcellulose sodium denture adhesive. 872.3410 Section 872.3410...carboxymethylcellulose sodium denture adhesive. (a) Identification. An ethylene...carboxymethylcellulose sodium denture adhesive is a device containing ethylene...

2011-04-01

159

21 CFR 872.3420 - Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive.  

Code of Federal Regulations, 2012 CFR

...cationic polyacrylamide polymer denture adhesive. 872.3420 Section 872.3420...cationic polyacrylamide polymer denture adhesive. (a) Identification. A carboxymethylcellulose...cationic polyacrylamide polymer denture adhesive is a device composed of...

2012-04-01

160

21 CFR 872.3450 - Ethylene oxide homopolymer and/or karaya denture adhesive.  

Code of Federal Regulations, 2011 CFR

...oxide homopolymer and/or karaya denture adhesive. 872.3450 Section 872.3450...oxide homopolymer and/or karaya denture adhesive. (a) Identification. Ethylene oxide homopolymer and/or karaya denture adhesive is a device composed of...

2011-04-01

161

21 CFR 872.3420 - Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive.  

Code of Federal Regulations, 2011 CFR

...Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive. 872.3420 Section...Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive. (a) Identification...carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive is a device...

2011-04-01

162

21 CFR 872.3480 - Polyacrylamide polymer (modified cationic) denture adhesive.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 false Polyacrylamide polymer (modified cationic) denture adhesive...Devices § 872.3480 Polyacrylamide polymer (modified cationic) denture adhesive. (a) Identification. A polyacrylamide polymer (modified cationic) denture...

2011-04-01

163

21 CFR 872.3480 - Polyacrylamide polymer (modified cationic) denture adhesive.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Polyacrylamide polymer (modified cationic) denture adhesive...Devices § 872.3480 Polyacrylamide polymer (modified cationic) denture adhesive. (a) Identification. A polyacrylamide polymer (modified cationic) denture...

2010-04-01

164

21 CFR 872.3420 - Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive.  

Code of Federal Regulations, 2010 CFR

...Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive. 872.3420 Section...Carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive. (a) Identification...carboxymethylcellulose sodium and cationic polyacrylamide polymer denture adhesive is a device...

2010-04-01

165

Effect of surface treatments on shear bond strength of denture teeth to denture base resins  

PubMed Central

Background: Debonding of denture teeth from denture bases is the most common failure in removable dentures. The purpose of this study was to evaluate the effect of surface treatments on shear bond strength of denture teeth to heat-polymerized and autopolymerized denture base resins. Materials and Methods: In this experimental in vitro study, 60 maxillary central incisor acrylic teeth were divided into two groups. Group M was polymerized with heat-polymerized acrylic resin (Meliodent) by compression molding technique and group F was processed by autopolymerized acrylic resin (Futura Gen) by injection molding technique. Within each group, specimens were divided into three subgroups according to the teeth surface treatments (n = 10): (1) ground surface as the control group (M1 and F1), (2) ground surface combined with monomer application (M2 and F2), and (3) airborne particle abrasion by 50 ?m Al2O3 (M3 and F3). The shear bond strengths of the specimens were tested by universal testing machine with crosshead speed of 5 mm/min. Data were analyzed by two-way analysis of variance (ANOVA) and Tukey's honestly significant difference (HSD) tests (P < 0.05). Results: The mean shear bond strengths of the studied groups were 96.40 ± 14.01, 124.70 ± 15.64, and 118 ± 16.38 N for M1, M2, and M3 and 87.90 ± 13.48, 117 ± 13.88, and 109.70 ± 13.78 N for F1, F2, and F3, respectively. The surface treatment of the denture teeth significantly affected their shear bond strengths to the both the denture base resins (P < 0.001). However, there were no significant differences between the groups treated by monomer or airborne particle abrasion (P = 0.29). The highest percentage of failure mode was mixed in Meliodent and adhesive in Futura Gen. Conclusion: Monomer application and airborne particle abrasion of the ridge lap area of the denture teeth improved their shear bond strengths to the denture base resins regardless of the type of polymerization. PMID:24688570

Bahrani, Farideh; Khaledi, Amir Ali Reza

2014-01-01

166

Liquid supported denture-management of flabby ridges  

PubMed Central

The ideal properties of a denture are adequate rigidity on polished surface to bear masticatory forces and at the same time, flexibility and softness on the tissue surface for proper and even distribution of masticatory forces. The problem with conventional denture is rigidity of tissue surface; leads to uneven distribution of load. This drawback even worsens in the case of flabby, atrophic and unemployed ridges with excessive bone resorption. The liquid supported denture allows continued adaptation and eliminates the disadvantages of denture designs based on the application of temporary tissue conditioners or soft liners. PMID:23293491

Mody, Pranav V.; Kumar, Girish; Kumar, Manish; Shetty, Brijesh

2012-01-01

167

Complication rates and patient satisfaction with removable dentures  

PubMed Central

PURPOSE The purpose of this clinical study was to evaluate the frequency and type of prosthetic complications in relation to type and properties of removable dentures and to investigate the influence of these complications and several data about the existing dentures on patient satisfaction. MATERIALS AND METHODS Ninety nine patients (44 males and 55 females) wearing removable dentures have been included in the study. The complications of the patients were recorded; patient satisfaction was determined with a Visual Analog Scale (VAS) and the relationship of complications and patient satisfaction with several data about the dentures such as denture age, type of denture, centric relation and vertical dimension was investigated. Kruskal Wallis, Mann Whitney U and Chi square tests were used for statistical analyses. The results were evaluated statistically at a significance level of P<.05. RESULTS Need for addition of artificial teeth for dentures with correct centric relations was found to be significantly lower than dentures with wrong centric relations (P<.01). Loss of retention, ulcerations and high vertical dimension affected the VAS chewing ability scores negatively and ulcerations affected the VAS phonation scores negatively (P<.05). CONCLUSION Considering the results of this study, it can be concluded that loss of retention, ulcerations and high vertical dimension caused patient dissatisfaction. Additionally, dentures with wrong centric relations caused need for addition of artificial teeth. PMID:22737317

Bilhan, Hakan; Erdogan, Ozge; Ergin, Selen; Celik, Melahat; Ates, Gokcen

2012-01-01

168

Forgotten denture in a hemiplegic patient.  

PubMed

A 74-yr-old man developed left hemiplegia because of a right middle cerebral artery territory infarction and also had clinical features of dysphagia and speech difficulty. At that time, he complained of neck pain, but the symptom was ignored because he had a nasogastric tube and had been diagnosed with a huge epiglottic cyst that had already shown several symptoms such as severe hoarseness and throat discomfort. A videofluoroscopic swallowing study was planned to find out the cause and the type of dysphagia. On the videofluoroscopic swallowing study, a foreign body was found at the hypopharynx. Surprisingly, it was confirmed as a denture. After removing the denture, the patient's swallowing and speech difficulty were significantly improved. This case emphasizes the need for elderly stoke patients presenting with dysphagia or communication problems to receive more careful history taking and a more complete physical examination, with the cooperation of several clinical departments. PMID:24141105

Kim, Hyo-Sang; Kim, Chang-Hwan; Kim, Myeong-Ok; Joa, Kyung-Lim; Chung, Hyung; Jung, Han-Young

2014-03-01

169

Unusual Case of Acanthamoeba polyphaga and Pseudomonas aeruginosa Keratitis in a Contact Lens Wearer from Gauteng, South Africa  

Microsoft Academic Search

Acanthamoeba species can cause a chronic, progressive ulcerative keratitis of the eye which is not responsive to the usual antimicrobial therapy and is frequently mistaken for stromal herpes keratitis. An unusual case of coinfection with Acanthamoeba polyphaga and Pseudomonas aeruginosa as causes of corneal keratitis in a contact lens wearer from Gauteng, South Africa, is reported. These two pathogens have

L. A. DINI; C. COCKINOS; J. A. FREAN; I. A. NISZL; M. B. MARKUS

2000-01-01

170

Immediate maxillary denture base extension for posterior palatal seal.  

PubMed

A procedure for extension of the maxillary denture base for development of a posterior palatal seal is described. The technique involves provisional extension with paraffin wax and adding direct relining resin supported by a silicone putty core. This simple, quick procedure achieves immediate recovery of retention for underextended maxillary dentures without additional laboratory procedures. PMID:10709049

Sato, Y; Hosokawa, R; Tsuga, K; Yoshida, M

2000-03-01

171

Immediate maxillary denture base extension for posterior palatal seal  

Microsoft Academic Search

A procedure for extension of the maxillary denture base for development of a posterior palatal seal is described. The technique involves provisional extension with paraffin wax and adding direct relining resin supported by a silicone putty core. This simple, quick procedure achieves immediate recovery of retention for underextended maxillary dentures without additional laboratory procedures. (J Prosthet Dent 2000;83:371-3.)

Yuuji Sato; Ryuji Hosokawa; Kazuhiro Tsuga; Mitsuyoshi Yoshida

2000-01-01

172

21 CFR 872.3570 - OTC denture repair kit.  

Code of Federal Regulations, 2010 CFR

...Identification. An OTC denture repair kit is a device consisting of a material, such as a resin monomer system of powder and liquid glues, that is intended to be applied permanently to a denture to mend cracks or breaks. The device may be available for...

2010-04-01

173

21 CFR 872.3570 - OTC denture repair kit.  

Code of Federal Regulations, 2012 CFR

...Identification. An OTC denture repair kit is a device consisting of a material, such as a resin monomer system of powder and liquid glues, that is intended to be applied permanently to a denture to mend cracks or breaks. The device may be available for...

2012-04-01

174

21 CFR 872.3570 - OTC denture repair kit.  

Code of Federal Regulations, 2011 CFR

...Identification. An OTC denture repair kit is a device consisting of a material, such as a resin monomer system of powder and liquid glues, that is intended to be applied permanently to a denture to mend cracks or breaks. The device may be available for...

2011-04-01

175

21 CFR 872.3570 - OTC denture repair kit.  

...Identification. An OTC denture repair kit is a device consisting of a material, such as a resin monomer system of powder and liquid glues, that is intended to be applied permanently to a denture to mend cracks or breaks. The device may be available for...

2014-04-01

176

21 CFR 872.3570 - OTC denture repair kit.  

Code of Federal Regulations, 2013 CFR

...Identification. An OTC denture repair kit is a device consisting of a material, such as a resin monomer system of powder and liquid glues, that is intended to be applied permanently to a denture to mend cracks or breaks. The device may be available for...

2013-04-01

177

First Report of Hartmannella keratitis in a Cosmetic Soft Contact Lens Wearer in Iran  

PubMed Central

Background Poor hygiene will provide good condition for corneal infections by opportunistic free-living amoebae (FLA) in soft contact lens wearers. In the present study an amoebic keratitis due to Hartmannella has been recognized in a 22-year-old girl with a history of improper soft contact lens use. She had unilateral keratitis on her left eye. Her clinical signs were eye pain, redness, blurred vision and photophobia. The round cysts of free-living amoebae were identified in non-nutrient agar medium by light microscopy. These cysts were suspected to be Hartmannella using morphological criteria. A PCR assay has been confirmed that the round cysts were belonged to H. vermiformis. PMID:24454444

ABEDKHOJASTEH, Hoda; NIYYATI, Maryam; RAHIMI, Firoozeh; HEIDARI, Mansour; FARNIA, Shohreh; REZAEIAN, Mostafa

2013-01-01

178

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

179

The adhesive strength and initial viscosity of denture adhesives.  

PubMed

Abstract Objective. To examine the initial viscosity and adhesive strength of modern denture adhesives in vitro. Materials and methods. Three cream-type denture adhesives (Poligrip S, Corect Cream, Liodent Cream; PGS, CRC, LDC) and three powder-type denture adhesives (Poligrip Powder, New Faston, Zanfton; PGP, FSN, ZFN) were used in this study. The initial viscosity was measured using a controlled-stress rheometer. The adhesive strength was measured according to ISO-10873 recommended procedures. All data were analyzed independently by one-way analysis of variance combined with a Student-Newman-Keuls multiple comparison test at a 5% level of significance. Results. The initial viscosity of all the cream-type denture adhesives was lower than the powder-type adhesives. Before immersion in water, all the powder-type adhesives exhibited higher adhesive strength than the cream-type adhesives. However, the adhesive strength of cream-type denture adhesives increased significantly and exceeded the powder-type denture adhesives after immersion in water. For powder-type adhesives, the adhesive strength significantly decreased after immersion in water for 60 min, while the adhesive strength of the cream-type adhesives significantly decreased after immersion in water for 180 min. Conclusion. Cream-type denture adhesives have lower initial viscosity and higher adhesive strength than powder type adhesives, which may offer better manipulation properties and greater efficacy during application. PMID:24791610

Han, Jian-Min; Hong, Guang; Dilinuer, Maimaitishawuti; Lin, Hong; Zheng, Gang; Wang, Xin-Zhi; Sasaki, Keiichi

2014-11-01

180

Rare case of lung abscess caused by a swallowed denture.  

PubMed

Accidentally swallowed dentures can cause serious complications when they are not diagnosed and treated promptly. We report an extremely rare case of a lung abscess caused by a swallowed complete denture. Chest computed tomography and endoscopic examination revealed that a swallowed denture migrated to the right upper lobe through an esophagopulmonary fistula, and a lung abscess developed. A life-saving and curative operation was performed with no significant postoperative complications. To the best of our knowledge, such a clinical condition has not yet been described in the literature. PMID:24694419

Mogi, Akira; Itoh, Tomokazu; Tanaka, Shigebumi; Kuwano, Hiroyuki

2014-04-01

181

An extensive denture-induced hyperplasia of maxilla.  

PubMed

Denture-induced hyperplasia is a reactive lesion arising from excessive and chronic mechanical pressure on the vestibular oral mucosa. It has a female predilection and it is mostly seen in the maxilla. The size of the lesion may be as small as a few millimeters to massive lesion involving the entire vestibule. It is usually asymptomatic but sometimes severe inflammation and ulceration can occur. Elimination of the inflammation and excision of the lesion is the treatment of choice. Denture induced hyperplasia in right maxillary buccal vestibule in a middle age old female patient was presented. Surgical excision was done and new denture was fabricated. PMID:24349860

Veena, Km; Jagadishchandra, H; Sequria, J; Hameed, Sk; Chatra, L; Shenai, P

2013-11-01

182

Prosthodontic Rehabilitation of Hereditary Ectodermal Dysplasia in an 11-Year-Old Patient with Flexible Denture: A Case Report  

PubMed Central

Hereditary ectodermal dysplasia is a rare group of inherited disorders characterized by aplasia or dysplasia of two or more tissues of ectodermal origin such as hair, nails, teeth, and skin. The dental characteristics of this syndrome include anodontia or hypodontia of the primary and/or permanent teeth, hypoplastic conical teeth, and underdevelopment of the alveolar ridges. The options for a definitive treatment plan include fixed, removable or implant-supported prostheses, singly or in combination. This clinical report describes the prosthetic rehabilitation of an 11-year-old boy with hereditary ectodermal dysplasia. Maxillary flexible removable partial denture and mandibular conventional complete denture were fabricated to establish an acceptable masticatory function, speech, and esthetics for the patient. PMID:23320200

Jain, Neha; Naitam, Dinesh; Wadkar, Arti; Nemane, Anuradha; Katoch, Shiva; Dewangan, Ashish

2012-01-01

183

Subscriber identity module: A new method for denture identification  

PubMed Central

This article describes a technique for placing subscriber identity module into a complete denture. The cards stores information in the form of text messages and contacts which is easily accessible with all mobile devices, thus enabling quicker identification. PMID:24130595

Colvenkar, Shreya

2013-01-01

184

21 CFR 872.3540 - OTC denture cushion or pad.  

Code of Federal Regulations, 2010 CFR

...paragraph (b)(1) of this section. The special controls for this device are FDA's: (i) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical—Devices Part I: Evaluation and Testing,’ ” and (ii) “OTC Denture...

2010-04-01

185

21 CFR 872.3540 - OTC denture cushion or pad.  

Code of Federal Regulations, 2012 CFR

...paragraph (b)(1) of this section. The special controls for this device are FDA's: (i) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical—Devices Part I: Evaluation and Testing,’ ” and (ii) “OTC Denture...

2012-04-01

186

21 CFR 872.3540 - OTC denture cushion or pad.  

Code of Federal Regulations, 2011 CFR

...paragraph (b)(1) of this section. The special controls for this device are FDA's: (i) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical—Devices Part I: Evaluation and Testing,’ ” and (ii) “OTC Denture...

2011-04-01

187

21 CFR 872.3560 - OTC denture reliner.  

Code of Federal Regulations, 2011 CFR

...b) Classification. Class II. The special controls for this device are FDA's: (1) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical Devices—Part I: Evaluation and Testing,’ ” and (2) “OTC Denture...

2011-04-01

188

21 CFR 872.3540 - OTC denture cushion or pad.  

Code of Federal Regulations, 2013 CFR

...paragraph (b)(1) of this section. The special controls for this device are FDA's: (i) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical—Devices Part I: Evaluation and Testing,’ ” and (ii) “OTC Denture...

2013-04-01

189

21 CFR 872.3560 - OTC denture reliner.  

...b) Classification. Class II. The special controls for this device are FDA's: (1) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical Devices—Part I: Evaluation and Testing,’ ” and (2) “OTC Denture...

2014-04-01

190

21 CFR 872.3560 - OTC denture reliner.  

Code of Federal Regulations, 2010 CFR

...b) Classification. Class II. The special controls for this device are FDA's: (1) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical Devices—Part I: Evaluation and Testing,’ ” and (2) “OTC Denture...

2010-04-01

191

21 CFR 872.3560 - OTC denture reliner.  

Code of Federal Regulations, 2013 CFR

...b) Classification. Class II. The special controls for this device are FDA's: (1) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical Devices—Part I: Evaluation and Testing,’ ” and (2) “OTC Denture...

2013-04-01

192

21 CFR 872.3560 - OTC denture reliner.  

Code of Federal Regulations, 2012 CFR

...b) Classification. Class II. The special controls for this device are FDA's: (1) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical Devices—Part I: Evaluation and Testing,’ ” and (2) “OTC Denture...

2012-04-01

193

How Could Contact Lens Wearers Be at Risk of Acanthamoeba Infection? A Review  

PubMed Central

Contact lens wear is highly influential on the incidence of ulcerative keratitis worldwide, particularly in developed countries. The association between Acanthamoeba keratitis and contact lens wear is firmly established; it may account for up to 95% of the reported cases. Before the popularisation of soft contact lens wear, Acanthamoeba keratitis was extremely rare. In 2000 it was estimated that the number of contact lens wearers worldwide was about 80 million, out of whom 33 million were in the United States and 90% of them wore hydrogel soft lenses. Contact lens-related problems depend on many factors, such as lens material, wearing modality, lens hygiene, type of lens-caring solution, the degree of compliance of the lens user with lens wear and care procedures, lens overwear, sleeping in lenses, rate of changing lenses, and lens case hygiene. This paper is a thorough review of the literature aiming to highlight the role of one of the main risk factors of infectious keratitis, contact lens wear, and also to show the responsibility of lens users in aggravating this risk.

Ibrahim, Youhanna W.; Boase, David L.; Cree, Ian A.

2010-01-01

194

Clinical gap changes after porcelain firing cycles of zirconia fixed dentures  

PubMed Central

PURPOSE The aim of this study was to measure the changes on the marginal and internal adaptation of zirconia based anterior fixed partial dentures after the porcelain firing process. MATERIALS AND METHODS A total of 34 anterior fixed partial dentures using LAVA CAD/CAM system (3M ESPE, Germany) were applied. Two silicone replicas were obtained: one is obtained before porcelain firing process (initial) and the other is obtained after porcelain firing process (final), followed by the examination under a binocular stereomicroscope. Kruskal Wallis and Wilcoxon Signed Ranks tests were used for the statistical analysis (P<.05). RESULTS No statistically significant difference was found between initial and final marginal gap values (P>.05). At the internal gap measurements, final marginal area values (59.54 µm) were significantly lower than the initial marginal area values (68.68 µm)(P<.05). The highest and the lowest internal gap values were observed at the incisal/occlusal area and at the marginal area, respectively. In addition, lower internal gap values were obtained for canines than for central incisors, lateral incisors and premolars at the incisal area (P<.05). CONCLUSION The firing cycles did not affect the marginal gap of Lava CAD/CAM system, but it is controversial for the internal gap. PMID:25006381

Bugurman, Bugurman Burcu

2014-01-01

195

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

196

Denture identification using unique identification authority of India barcode  

PubMed Central

Over the years, various denture marking systems have been reported in the literature for personal identification. They have been broadly divided into surface marking and inclusion methods. In this technique, patient's unique identification number and barcode printed in the patient's Aadhaar card issued by Unique Identification Authority of India (UIDAI) are used as denture markers. This article describes a simple, quick, and economical method for identification of individual. PMID:23960418

Mahoorkar, Sudhindra; Jain, Anoop

2013-01-01

197

Mutagenicity of ethanolic extracts of used acrylic dentures.  

PubMed

The in vivo physicochemical sorption of mutagenic substances onto acrylic polymers was investigated in worn acrylic dentures. Thus, ethanolic extracts of acrylic dentures from 41 of a total of 69 human donors (60%), were found mutagenic in the standard plate incorporation Salmonella mutagenicity test against either TA98 or TA100 strains. Denture extracts from smokers produced mutagenicity more often than the ones from non-smokers (75% vs. 45%, P 0.01). Mutagenicity was preferentially directed against TA98 (TA98:TA100 = 2.9:1, P < 0.0005). Predilection for TA98 was more pronounced in denture extracts from non-smokers (4.7:1) than from smokers (2.0:1). When direct mutagenicity was observed, it was reduced by the rat-liver S9. Induced mutant yields were 6.1 +/- 3.9 and 7.0 +/- 8.9 times higher than the spontaneous for TA98 and TA100 respectively (smokers, 50-cm2 denture surface area eq./plate+S9). Denture extracts from smokers induced higher levels of mutation than the ones from non-smokers (TA98 + S9, smoker:non-smoker = 2:1, P < 0.01). Mutagenicity was associated with longer periods of denture usage (P 0.007). Thus, denture poly(methyl methacrylate) base material can adsorb mutagenic substances, possibly from diet and tobacco, which are extractable by ethanol. Theoretically, the in situ alcoholic desorption and recirculation of carcinogenic mutagens may have a contributory role in certain cases of intra-oral and upper alimentary tract carcinogenesis. PMID:7515162

Parisis, D M; Eskoz, N L; Henderson, W G

1994-06-01

198

Comparison of the antimicrobial capability of an abrasive paste and chemical-soak denture cleaners.  

PubMed

The objective of this research was to compare the ability of the two most popular methods for denture cleaning to remove plaque microorganisms from dentures. Dentu-Creme abrasive denture paste and Efferdent alkaline peroxide denture-cleanser soak were selected for study. Two trials were completed in which these materials were used alone and in combination along with a no-treatment control to determine the level of recoverable plaque bacteria from removable dentures. Plaque was allowed to accumulate for 48 or 72 hours in individuals with healthy oral mucosa during which time they refrained from all denture hygiene procedures. The results of two studies following similar double-blind cross-over designs were consistent in that soaking with the denture cleanser caused a significantly greater reduction of microorganisms than did brushing with the denture paste. Further, combining brushing with the soak did not reduce the level of recoverable microorganisms significantly more than soaking alone. Overall, brushing alone did not consistently remove more microorganisms than were observed in the no-treatment group. The denture-cleanser soak displayed broad antimicrobial activity against gram-negative anaerobic rods (Fusobacterium sp.), gram-positive facultative cocci (streptococci), and gram-negative anaerobic cocci (Veillonella sp.), as well as total recoverable microorganisms, which were all equally reduced by the denture-cleanser treatment. These results support the need for use of a denture cleanser in addition to brushing with a denture paste for proper denture hygiene. PMID:3054068

Dills, S S; Olshan, A M; Goldner, S; Brogdon, C

1988-10-01

199

Topical voriconazole therapy of Purpureocillium lilacinum keratitis that occurred in disposable soft contact lens wearers.  

PubMed

The objective of this study was to describe 2 cases of keratitis caused by Purpureocillium lilacinum (formerly Paecilomyces lilacinus) that occurred in disposable contact lens users, which were successfully treated with topical voriconazole. Case 1 was a healthy 44-year-old woman, who wore weekly disposable contact lenses and had developed a superficial corneal infection in her right eye. For diagnosis, corneal scraping and molecular identification of the cultured pathogen were performed. A corneal smear revealed the presence of fungi. The pathogen was identified as P. lilacinum by traditional morphological identification of fungal culture, and this identification was confirmed by DNA sequencing of the ribosomal internal transcribed spacer (ITS) sequence. Therapy with topical fluconazole, topical pimaricin (natamycin), and oral itraconazole were ineffective. Topical voriconazole showed a significant effect, and the keratitis was successfully treated. Case 2 was a 43-year-old woman with bilateral recurrent peripheral corneal ulcers by meibomian gland dysfunction, who used therapeutic bandage contact lenses on her left eye. However, a corneal abscess with hypopyon occurred in the eye after 3 months. The microbial smear examination showed the presence of fungi and the fungal culture, and the DNA sequence of ITS region revealed that the causative agent was P. lilacinum. The susceptibility testing against antifungal agents showed that voriconazole was effective. The lesion improved gradually by topical voriconazole. As a conclusion, P. lilacinum keratitis can occur in disposable soft contact lens wearer. Early and accurate detection of the pathogenic organism is essential. Topical voriconazole was effective against P. lilacinum keratitis. PMID:24974133

Todokoro, Daisuke; Yamada, Norihiro; Fukuchi, Mariko; Kishi, Shoji

2014-10-01

200

Analysis of stresses in complete upper dentures with flat teeth at differing inclinations  

Microsoft Academic Search

This study measures the effect of the inclination of the occlusal surfaces of flat teeth, on the magnitude of exerted stresses in a model of the complete upper denture (CUD), in order to estimate which inclination could be more beneficial for the stressed denture.Three groups of dentures were produced, with three different inclinations of their posterior flat teeth on the

Anthony E. Prombonas; Dimitris S. Vlissidis

2009-01-01

201

Failure load of acrylic resin denture teeth bonded to high impact acrylic resins  

Microsoft Academic Search

Statement of problem. Techniques for bonding denture teeth to an acrylic resin denture base remain empirical, with little consensus from the literature, among clinicians, or among dental laboratories. Purpose. This study evaluated the failure load of acrylic resin teeth bonded to 2 high impact acrylic resins. Methods and material. The ridge lap portion on 120 identical denture teeth were modified

Donna Barpal; Donald A. Curtis; Frederick Finzen; Jovin Perry; Stuart A. Gansky

1998-01-01

202

Effect of five woven fiber reinforcements on the impact and transverse strength of a denture base resin  

Microsoft Academic Search

Statement of problem. Fracture strength of denture base resins is of great concern, and many approaches have been used to strengthen acrylic resin dentures. Purpose. This study measured the effect of 5 fiber strengtheners on the fracture resistance of denture base acrylic resin material. Impact strength, transverse strength, deflection, and elasticity modulus values of a heat-polymerized denture base resin (Trevalon),

Gülay Uzun; Nur Hersek; Teoman Tinçer

1999-01-01

203

Anticandidal Activity and Biocompatibility of a Rechargeable Antifungal Denture Material  

PubMed Central

Objectives Candida-associated denture stomatitis is a recurrent and debilitating oral mucosal disease. Development of anticandidal denture materials represents a promising strategy to manage this condition. We have previously shown that miconazole incorporated in methacrylic acid (MAA) copolymerized diurethane dimethacrylate (UDMA) denture materials has long-term anticandidal activity. In this study, we examined the ability of culture medium conditioned with drug-free- or miconazole-MAA-UDMA discs to prevent Candida infection in an in vitro oral epithelial cell/Candida albicans co-culture system. Material and Methods Candida albicans (C. albicans) induced OKF6/TERT-2 cell damage was quantified by the release of lactate dehydrogenase from epithelial cells, cytokine production was quantified using protein cytokine arrays, and the expression of C. albicans genes was measured by RT-qPCR. Results C. albicans had limited growth with altered expression levels of secreted aspartyl proteinase-2 and -5 in culture medium conditioned by miconazole-MAA-UDMA discs. Significantly, the ability of C. albicans to induce oral epithelial cell damage and trigger epithelial proinflammatory cytokine production was also inhibited by miconazole disc conditioned media. Conclusion Miconazole released from MAA-UDMA denture materials effectively prevents the development of candidal infection in an in vitro oral epithelial system. Further characterization of this drug-rechargeable denture material is warranted. PMID:22957799

Villar, Cristina C.; Lin, Alan L.; Cao, Zhengbing; Zhao, Xiang-Ru; Wu, Li-An; Chen, Shuo; Sun, Yuyu; Yeh, Chih-Ko

2013-01-01

204

[Evaluation of cermet fillings in abutment teeth in removable partial prostheses].  

PubMed

The aim of the study was to describe the clinical process of setting the purpose filling on abutment teeth, after finishing the removable partial dentures. The aim was also to investigate the use of cermet glass-ionomer cement for the purpose filling in the abutment teeth for removable partial dentures, as well as to investigate the surface of the purpose filling. For the clinical evaluation of purpose filling slightly modified criteria according to Ryg's were used in 20 patients with different type of edentulousness. Changes occurring on the surface of purpose filling have been experimentally established by the method of scanning electron microscopy on the half-grown third molars in seven patients. It could be concluded that cement glass-ionomer was not the appropriate material for the purpose fillings in abutment teeth for removable partial dentures. PMID:11858021

Saulic, S; Tihacek-Sojic, Lj

2001-01-01

205

Giant papillary conjunctivitis in frequent-replacement contact lens wearers: a retrospective study.  

PubMed Central

PURPOSE: A retrospective study was done of 47 patients who wore frequent-replacement contact lenses on a daily basis and replaced them every 1 day to 12 weeks. The incidence of giant papillary conjunctivitis (GPC) was determined, and potential risk factors that may predispose frequent-replacement contact lens wearers to develop GPC were assessed. METHODS: The records of patients who were fitted with frequent-replacement contact lenses with no prior contact lens experience (September 1993 to February 1997) were reviewed. RESULTS: Forty-seven of 260 patients met the requirement for inclusion in this study. Ten (21.27%) of the patients developed GPC. The incidence varied according to how often the contact lenses were replaced. Incidence was 36% in patients who replaced their lenses at 4 weeks or longer and 4.5% in patients who replaced their lenses at less than 4 weeks. Lenses were coated more often in patients who replaced their lenses at 4 weeks or longer (pi = .23). A significantly greater number of patients in the GPC group incorporated enzyme into their contact lens care system (pi = .0004). A history of allergy was present, significantly more often in patients who developed GPC (pi = .012). There was no significant difference between the groups for age, sex, average daily wearing time, Food and Drug Administration classification of contact lens material, time in contact lenses from fitting to diagnosis or last follow-up period, or the parameters and fitting characteristics of the contact lenses. CONCLUSION: The frequency of contact lens replacement appears to be an important variable in development of GPC. Although frequent-replacement contact lenses do not eliminate GPC, patients on a 1-day to 3-week replacement cycle had a significantly lower risk of developing GPC than patients who replaced their lenses at longer intervals. Coating was present less often on lenses replaced every 1 day to 3 weeks. In patients who are at high risk for GPC, replacing lenses at intervals of 1 day to 2 weeks appears to offer a better strategy in avoiding GPC than incorporating enzymatic cleaning into their care system. PMID:10703125

Donshik, P C; Porazinski, A D

1999-01-01

206

Effect of denture wearing on occurrence of fungal Isolates in the oral cavity: A pilot study  

PubMed Central

Objectives: An attempt was made to evaluate effect of denture wearing on occurrence of fungal isolates in the oral cavity before and after complete denture insertion. Method: Twenty five completely edentulous patients were selected; swab samples were collected intraorally before fabrication of complete dentures from labial vestibular area and after complete denture fabrication (one and four days after denture insertion). Further these samples were inoculated and incubated. Results: In nineteen patients no isolate of fungus before denture insertion as well as 4 days after denture insertion was found. In two subject results were false positive (contamination from environment), and in four patients there was increase in growth but not much significant increase of growth of fungal isolates was seen (mild growth of fungus only after denture insertion). One of the major finding of this study was overall occurrence of fungal isolates (before and after denture insertion) in the oral cavity were not significant. Key words:Fungal isolates, denture stomatitis, denture, Candida, insertion. PMID:24558540

Singh, Varsha A.; Garg, Sandeep K.; Mittal, Sanjeev; Chahal, Gagandeep K.

2012-01-01

207

Assessing the efficacy of denture cleaners with quantitative light-induced fluorescence (QLF).  

PubMed

The aim of this study was to evaluate Quantitative Light Induced Fluorescence (QLF) analysis as a means of determining the ability of denture cleaners to remove stain from denture teeth. This study investigated the appearance of acrylic resin denture teeth subjected to QLF conditions in vitro. It aimed to determine if QLF was an appropriate method for detecting stain and its removal on acrylic resin denture teeth in vitro and also to develop a quantitative and reproducible method for assessing the efficacy of denture cleaners using QLF. This study showed that not all acrylic resin denture teeth fluoresced under QLF examination. QLF demonstrated the ability to detect and quantify longitudinal changes in stain removal by the various denture cleaners used in the study. PMID:18236927

Adeyemi, Adejumoke Adeola; Jarad, Fadi; Pender, Neil; Higham, Susan Mary

2007-12-01

208

Fabricating complete dentures with CAD/CAM technology.  

PubMed

Conventional complete denture prosthetics require several appointments to register the maxillomandibular relationship and evaluate the esthetics. The fabrication of milled complete dental prostheses with digital scanning technology may decrease the number of appointments. The step-by-step method necessary to obtain impressions, maxillomandibular relation records, and anterior tooth position with an anatomic measuring device is described. The technique allows the generation of a virtual denture, which is milled to exact specifications without the use of conventional stone casts, flasking, or processing techniques. PMID:24461946

Infante, Luis; Yilmaz, Burak; McGlumphy, Edwin; Finger, Israel

2014-05-01

209

Comparative Evaluation of Sorption, Solubility and Microhardness of Heat Cure Polymethylmethacrylate Denture Base Resin & Flexible Denture Base Resin  

PubMed Central

Aim: The aim of the study was to evaluate and compare sorption, solubility and microhardness of heat cure polymethylmethacrylate (PMMA) denture base resin and flexible (thermoplastic polyamide nylon) denture base resin. Materials and Methods: Sorption, solubility and microhardness were assessed to determine compliance with ADA Specification no. 12. Results were assessed using statistical and observational analyses. Result: All materials satisfied ADA requirements for sorption, solubility and microhardness. Heat cure PMMA showed more sorption, solubility and microhardness than flexible (thermoplastic polyamide nylon). Conclusion: Flexible (thermoplastic polyamide nylon) resin absorbs less water, is less soluble and is more flexible than PMMA. PMID:25302291

Bulbule, Nilesh; Kulkarni, Shilpa; Shah, Riddhi; Kakade, Dilip

2014-01-01

210

Effect of denture cleansers on metal ion release and surface roughness of denture base materials.  

PubMed

Chemical disinfectants are usually associated with mechanical methods to remove stains and reduce biofilm formation. This study evaluated the effect of disinfectants on release of metal ions and surface roughness of commercially pure titanium, metal alloys, and heat-polymerized acrylic resin, simulating 180 immersion trials. Disk-shaped specimens were fabricated with commercially pure titanium (Tritan), nickel-chromium-molybdenum-titanium (Vi-Star), nickel-chromium (Fit Cast-SB Plus), and nickel-chromium-beryllium (Fit Cast-V) alloys. Each cast disk was invested in the flasks, incorporating the metal disk to the heat-polymerized acrylic resin. The specimens (n=5) were immersed in these solutions: sodium hypochlorite 0.05%, Periogard, Cepacol, Corega Tabs, Medical Interporous, and Polident. Deionized water was used as a control. The quantitative analysis of metal ion release was performed using inductively coupled plasma mass spectrometry (ELAN DRC II). A surface analyzer (Surftest SJ-201P) was used to measure the surface roughness (µm). Data were recorded before and after the immersions and evaluated by two-way ANOVA and Tukey's test (?=0.05). The nickel release proved most significant with the Vi-Star and Fit Cast-V alloys after immersion in Medical Interporous. There was a significant difference in surface roughness of the resin (p=0.011) after immersion. Cepacol caused significantly higher resin roughness. The immersion products had no influence on metal roughness (p=0.388). It could be concluded that the tested alloys can be considered safe for removable denture fabrication, but disinfectant solutions as Cepacol and Medical Interporous tablet for daily denture immersion should be used with caution because it caused greater resin surface roughness and greater ion release, respectively. PMID:23207854

Davi, Letícia Resende; Felipucci, Daniela Nair Borges; de Souza, Raphael Freitas; Bezzon, Osvaldo Luiz; Lovato-Silva, Cláudia Helena; Pagnano, Valéria Oliveira; Paranhos, Helena de Freitas Oliveira

2012-01-01

211

Effects of mechanical and chemical methods on denture biofilm accumulation.  

PubMed

The aim of this study was to quantify biofilm on the internal surface of upper complete dentures following six possible cleansing methods. Thirty-six edentulous subjects were submitted to a time-series trial and dentures were cleansed according to six methods: (i) rinsing with water; (ii) soaking in an alkaline peroxide solution (Bonyplus); (iii) brushing with dentifrice (Dentu-Creme) and soft Johnson and Johnson's toothbrush; (iv) combination between soaking and brushing according to methods 2 and 3; (v) brushing with dentifrice (Dentu-Creme) and soft Oral B toothbrush; (vi) combination between soaking and brushing according to methods 2 and 5. Each method was randomly used throughout 21 days. Denture biofilm was disclosed by 1% neutral red solution and quantified by means of digital photos taken from the internal surface. The six methods presented significant differences in percentage of biofilm coverage (repeated measures anova, P < 0.0001). Method 1 showed the highest values, 2 was intermediate and other results were the lowest. The most efficacious approach was 6. Biofilm tended to accumulate predominantly over specific zones of the denture base, but this pattern did not change regardless of the method employed. It can be concluded that brushing alone was more effective than the chemical method employed. The best results were obtained by a combination of methods. PMID:17650171

Paranhos, H F O; Silva-Lovato, C H; Souza, R F; Cruz, P C; Freitas, K M; Peracini, A

2007-08-01

212

Efficacy of conventional and experimental techniques for denture repair.  

PubMed

This study investigated the efficacy of one experimental and three conventional techniques for denture repair. Forty maxillary dentures were constructed in dental stone casts duplicated from an edentulous copper-aluminium maxillary master cast. Two groups of 20 dentures each were prepared with Lucitone 199 (water-bath, 8 h/74 degrees C) or Acron MC (microwave, 3 min/500 W) denture base materials processed in gypsum moulds. The 40 dentures were all separated sagittally in the middle. After that, five dentures of each denture base material were repaired with one of the four following techniques: L (Lucitone 199, water-bath, 8 h/74 degrees C, gypsum mould), A (Acron MC, microwave, 3 min/500 W, gypsum mould), AR (Acron MC/R, autopolymerized, 60 psi/45 degrees C/15 min) and the experimental technique AS (Acron MC, 1 min/500 W + 1 min/0 W + 1 min/500 W, hard silicone mould). The parameters denture accuracy (DA), horizontal (HC) and vertical changes (VC) of the occlusal plane measured the efficacy of the repair techniques. The DA was determined by weighing a film of silicone impression material set in contact to the tissue surface of the denture seated on the metallic master die. For HC, cross-arch measurements were made among reference marks drilled on the teeth 11, 21, 16 and 26. The VC was obtained by calculating the relative differences in height between similar teeth of each semi-arch (pairs 13-23, 14-24, 15-25 e 16-26). For DA, HC and VC, the percentage differences between the percentage means obtained before and after repair were calculated and grouped for comparisons. Analysis of variance (SuperANOVA) and means compared by Tukey-Kramer intervals (0.05) revealed that AR repair had the best percentage difference value for DA [0.5% (P < 0.05)], while the others were not statistically different [L = 27.2%, A = 28.9%, AS = 21.2% (P > 0.05)]. For HC, there was a statistical difference (P < 0.05) between AR and the other techniques for the tooth pairs, 16-26, 11-26 and 21-16; repairs with AR and AS differed for the 11-21 pair, while those with A and AS techniques differed for the 16-26 pair (P < 0.05). The VC differences were not detected between repair methods (P > 0.05). Denture accuracy was not affected by the interaction of base material-repair technique; repair with AR technique gave the best adaptation; the interaction of base material-repair technique did not affect HC; HC was affected by the repair technique. PMID:15525393

Rached, R N; Powers, J M; Del Bel Cury, A A

2004-11-01

213

ICK classification system for partially edentulous arches.  

PubMed

Several methods of classification of partially edentulous arches have been proposed and are in use. The most familiar classifications are those originally proposed by Kennedy, Cummer, and Bailyn. None of these classification systems include implants, simply because most of them were proposed before implants became widely accepted. At this time, there is no classification system for partially edentulous arches incorporating implants placed or to be placed in the edentulous spaces for a removable partial denture (RPD). This article proposes a simple classification system for partially edentulous arches with implants based on the Kennedy classification system, with modification, to be used for RPDs. It incorporates the number and positions of implants placed or to be placed in the edentulous areas. A different name, Implant-Corrected Kennedy (ICK) Classification System, is given to the new classification system to be differentiated from other partially edentulous arch classification systems. PMID:18544130

Al-Johany, Sulieman S; Andres, Carl

2008-08-01

214

Acanthamoeba spp. in domestic tap water in houses of contact lens wearers in the metropolitan area of Mexico City.  

PubMed

A survey was carried out in the metropolitan area of Mexico City to determine the presence of Acanthamoeba in the tap water of houses of contact lens wearers. Water samples were taken from the mains water entry, bathroom sinks and storage containers (roof tanks, cisterns) of 27 houses; and from the solution contained in the contact lens cases. Samples were filtered and cultured onto NNE medium. The isolates were identified based on their morphological features and pathogenicity. Total and fecal coliforms, water temperature, pH, dissolved oxygen and residual free-chlorine were measured by standard methods. Forty five isolates of Acanthamoeba from 200 water samples were obtained. The highest number of amoebae was isolated from cisterns and roof tanks. Most Acanthamoeba isolates were non-pathogenic, however, their presence in tap water is a potential hazard since some species can cause Acanthamoeba keratitis and granulomatous amoebic encephalitis. PMID:19995560

Bonilla-Lemus, Patricia; Ramírez-Bautista, Gerardo A; Zamora-Muñoz, Claudia; Ibarra-Montes, María Del Rocío; Ramírez-Flores, Elizabeth; Hernández-Martínez, María Dolores

2010-09-01

215

Effect of denture cleansers on surface hardness of resilient denture liners at various time intervals- an in vitro study  

PubMed Central

PURPOSE This study was aimed to determine the effect of two chemically distinct denture cleansers and water on the surface hardness of acrylic and silicone based soft denture liners at various time intervals. MATERIALS AND METHODS Two commonly used commercial resilient liner material were selected based on their chemical composition (silicone- and acrylic-based soft liners) for this investigation. 120 cylindrical specimens were made of 15 mm × 10 mm dimensions (according to ASTM: D-2240-64T) in a custom made metal mold. All specimens were stored in artificial saliva throughout the study. Forty specimens were cleansed daily in 0.5% sodium hypochlorite solution; forty were cleansed in sodium perborate and remaining forty specimens were daily rinsed in water. Testing was done at 1 week, 1 month, 3 months and 6 months for surface hardness using a Shore A Durometer. A mean of 3 reading for each sample was subjected to one-way ANOVA, Post Hoc test and pair-t test for statistical analysis. P values of less than 0.05 were taken as statistically significant. RESULTS Surface hardness of all the samples was significantly higher after a period of 6 months irrespective of the cleansing treatment. Minor changes were observed between control, sodium hypochlorite and sodium perborate groups with time. Greater change was observed in surface hardness of acrylic-based soft denture liners as compared to silicone-based soft liners for all groups, as time progressed. CONCLUSION Silicone-based soft denture liners performed significantly better in all cleansing treatments than acrylic-based soft denture liners. PMID:24049568

Pahuja, Rasleen Kaur; Bansal, Sanjay

2013-01-01

216

Isolation and identification of viable bacteria within acrylic resin denture bases  

Microsoft Academic Search

\\u000a This study aimed to isolate and identify the microbial species within acrylic resin denture bases. Bacteria were detected\\u000a from within acrylic resin denture bases. Lactobacillus species, Actinomyces, Streptococcus, and Propionibacterium species were predominantly identified. The present study revealed that viable bacteria existed within acrylic resin denture\\u000a bases suggesting that the bacteria and their metabolites may be related to the deterioration

Yasuhisa Takeuchi; Kazuko Nakajo; Takuichi Sato; Yoko Sakuma; Keiichi Sasaki; Nobuhiro Takahashi

217

Use of a complete denture as a radiation carrier  

SciTech Connect

When surgical resection of intraoral neoplasms is contraindicated, treatment by surface mold irradiation may be used. Success or failure of this mode of treatment may depend on the fabrication of a surface mold that can deliver the prescribed amount of therapeutic radiation in the desired amount of time. A technique for modification of an existing complete denture prosthesis for use as a surface mold has been described. Patient cooperation is essential for successful use of this modified prosthesis.

Herring, H.W. Jr.; Greene, P.E.

1983-06-01

218

Non-oral bifidobacteria and the aciduric microbiota of the denture plaque biofilm.  

PubMed

The microbiota of the denture plaque biofilm colonizing the fitting surface of dentures in edentulous subjects with healthy palates (n = 20) and in edentulous subjects with denture stomatitis (n = 20) was studied. The numbers of bacteria colonizing the dentures of healthy subjects was significantly less than the numbers colonizing the dentures of stomatitis subjects. The proportions and frequency of isolation of mutans streptococci, lactobacilli, bifidobacteria and yeasts were significantly (P < 0.05) greater in the subjects with denture stomatitis. The proportions of these organisms in the denture plaque biofilm of the subjects with denture stomatitis were similar to those found in carious lesions, indicating that the site is a low pH environment. The predominant bifidobacterial species in the mouths of dentate subjects is Bifidobacterium dentium but in the edentulous subjects wearing dentures B. dentium was isolated from only one of the 20 subjects with denture stomatitis and from none of the 20 subjects with healthy palates. Instead, Bifidobacterium breve, Bifidobacterium scardovii and Bifidobacterium longum subsp. longum were isolated. Only a single non-oral bifidobacterial species was isolated from each individual and repetitive extragenic palindromic- and BOX-polymerase chain reaction typing methods indicated that the same genotypes were shared between subjects. Using deferred antagonism spot plate assays, interspecies inhibition was demonstrated between oral isolates of B. dentium, B. breve, B. scardovii and B. longum subsp. longum. Here we have shown that bifidobacteria and caries-associated microbiota are present in denture plaque at levels similar to those of carious lesions and B. dentium cannot be maintained in an edentulous mouth. PMID:20536746

Mantzourani, M; Gilbert, S C; Fenlon, M; Beighton, D

2010-06-01

219

Cytocompatible antifungal acrylic resin containing silver nanoparticles for dentures  

PubMed Central

Background Inhibition of Candida albicans on denture resins could play a significant role in preventing the development of denture stomatitis. The safety of a new dental material with antifungal properties was analyzed in this work. Methods Poly(methyl methacrylate) [PMMA] discs and PMMA-silver nanoparticle discs were formulated, with the commercial acrylic resin, Nature-CrylTM, used as a control. Silver nanoparticles were synthesized and characterized by ultraviolet-visible spectroscopy, dispersive Raman spectroscopy, and transmission electron microscopy. The antifungal effect was assessed using a luminescent microbial cell viability assay. Biocompatibility tests were carried out using NIH-3T3 mouse embryonic fibroblasts and a Jurkat human lymphocyte cell line. Cells were cultured for 24 or 72 hours in the presence or absence of the polymer formulations and analyzed using three different tests, ie, cellular viability by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, and cell proliferation by enzyme-linked immunosorbent assay BrdU, and genomic DNA damage (Comet assay). Finally, the samples were evaluated mechanically, and the polymer-bearing silver nanoparticles were analyzed microscopically to evaluate dispersion of the nanoparticles. Results The results show that PMMA-silver nanoparticle discs significantly reduce adherence of C. albicans and do not affect metabolism or proliferation. They also appear not to cause genotoxic damage to cells. Conclusion The present work has developed a new biocompatible antifungal PMMA denture base material. PMID:22969297

Acosta-Torres, Laura Susana; Mendieta, Irasema; Nunez-Anita, Rosa Elvira; Cajero-Juarez, Marcos; Castano, Victor M

2012-01-01

220

Effect of silica coating and silane surface treatment on the bond strength of soft denture liner to denture base material  

PubMed Central

Objective This study investigated the effects of different surface treatments on the tensile bond strength of an autopolymerizing silicone denture liner to a denture base material after thermocycling. Material and Methods Fifty rectangular heat-polymerized acrylic resin (QC-20) specimens consisting of a set of 2 acrylic blocks were used in the tensile test. Specimens were divided into 5 test groups (n=10) according to the bonding surface treatment as follows: Group A, adhesive treatment (Ufi Gel P adhesive) (control); Group S, sandblasting using 50-µm Al2O3; Group SCSIL, silica coating using 30-µm Al2O3 modified by silica and silanized with silane agent (CoJet System); Group SCA, silica coating and adhesive application; Group SCSILA, silica coating, silane and adhesive treatment. The 2 PMMA blocks were placed into molds and the soft lining materials (Ufi Gel P) were packed into the space and polymerized. All specimens were thermocycled (5,000 cycles) before the tensile test. Bond strength data were analyzed using 1-way ANOVA and Duncan tests. Fracture surfaces were observed by scanning electron microscopy. X-ray photoelectron spectrometer (XPS) and Fourier Transform Infrared spectrometer (FTIR) analysis were used for the chemical analysis and a profilometer was used for the roughness of the sample surfaces. Results The highest bond strength test value was observed for Group A (1.35±0.13); the lowest value was for Group S (0.28±0.07) and Group SCSIL (0.34±0.03). Mixed and cohesive type failures were seen in Group A, SCA and SCSILA. Group S and SCSIL showed the least silicone integrations and the roughest surfaces. Conclusion Sandblasting, silica coating and silane surface treatments of the denture base resin did not increase the bond strength of the silicone based soft liner. However, in this study, the chemical analysis and surface profilometer provided interesting insights about the bonding mechanism between the denture base resin and silicone soft liner. PMID:24037067

ATSU, Saadet; KESKIN, Yasemin

2013-01-01

221

THE INFLUENCE OF DEMOGRAPHIC FACTORS AND MEDICAL CONDITIONS ON PATIENTS COMPLAINTS WITH COMPLETE DENTURES  

PubMed Central

Objective: The purpose of this study was to determine the most frequent complete denture complaints and to investigate the influence of age, gender and systemic disease conditions on the complaints. Methodology: This was a retrospective study in which information on the demographic data, medical and dental history of complete denture patients were obtained from their case records. Also the type of complaints and adjustment made to the denture at review appointments were recorded. All data generated were entered into IBM-Compatible micro-computer and analysed using the statistical packages of social sciences (SPSS) version 15. Chi-square test was used to test for statistical significance. Result: Eighty-two case records of complete denture patients were reviewed. Fourty-six of the patients were male while 36 were female. The age ranged between 40 and 90 years with mean age of 69.10 (SD=10.6) years. Fifty-one (62.2%) patients had complaints with their dentures during a week review appointment. Pain was the most common complaint 23 (28%), followed by lack of retention, 12 (14.6%). Eighteen (21.9%) patients had systemic medical conditions. Conclusion: There was no statistically significant relationship between patient age, gender, systemic health and denture complaints; but statistically significant relationship exist between types of denture, denture faults and complaints. PMID:25161408

Ogunrinde, T.J.; Dosumu, O.O.

2012-01-01

222

Fabrication of a multi-applicable removable intraoral denture system for rodent research  

PubMed Central

SUMMARY The objective was to engineer an inexpensive intraoral removable denture system for rodents that can be utilized in numerous oral health research applications. At the forefront is biofilm research related to Candida-associated denture stomatitis. Previously described intraoral devices are primitive and inadequate. The denture system was engineered consisting of a fixed part that is anchored to the posterior palate by orthodontic wires and acrylic resin, and a removable part fitted to the anterior palate that is retained by magnets embedded in the fixed part. Both parts are custom-fitted to the rodent palate by impression making and cast fabrication. Rats fitted with the intraoral denture system maintained body weight and normal activity with the device maintaining integrity and durability for upwards of 8 weeks. The denture system was used successfully to establish a working model of denture stomatitis. This newly engineered inexpensive intraoral removable denture system for rodents can be utilized in numerous oral health research applications, including denture-associated infections, biofilms, and a variety of biomaterial applications. The removable portion is advantageous for longitudinal analyses and charging/discharging of biomaterials. PMID:21323935

Lee, Heeje; Yu, Alika; Johnson, Clorinda C.; Noverr, Mairi C.; Fidel, Paul L.

2011-01-01

223

Dimensional change in complete dentures fabricated by injection molding and microwave processing  

Microsoft Academic Search

Statement of problem. Acrylic resin complete dentures undergo dimensional changes during polymerization. Techniques with injection molding and polymerization and microwave polymerization are reported to reduce these changes and thereby improve clinical fit. These dimensional changes need to be quantified. Purpose. The purpose of this study was to compare differences in dimensional changes of simulated maxillary complete dentures during polymerization and

Phillip L. J. Keenan; David R. Radford; Robert K. F. Clark

2003-01-01

224

Custom Metal Occlusal Surface for Acrylic Resin Denture Teeth to Enhance Wear Resistance: A Case Report  

PubMed Central

Wear of the occlusal surface of the denture is a known fact which leads to subsequent changes in jaw relation, vertical dimension, loss of aesthetics, aged looks, and decrease in masticatory efficiency. Treatment modalities includes, change of denture set after a regular interval of 4-5 years, use of wear resistant denture teeth that includes wear resistant resin or porcelain teeth, teeth with cast metal occlusal surface, and altering occlusal contact areas of denture teeth by use of silver amalgam fillings. A case report of a patient who had increased tendency of occlusal wear was treated with custom made metal occlusal surface of denture teeth to enhance wear resistance and to improve the masticatory efficiency. PMID:22997592

Shivji, Rizwan Ali; Kamble, Vaibhav D.; Khan, Mohd. Atif

2012-01-01

225

CAD/CAM fabricated complete dentures: concepts and clinical methods of obtaining required morphological data.  

PubMed

The clinical impression procedures described in this article provide a method of recording the morphology of the intaglio and cameo surfaces of complete denture bases and also identify muscular and phonetic locations for the prosthetic teeth. When the CAD/CAM technology for fabricating complete dentures becomes commercially available, it will be possible to scan the denture base morphology and tooth positions recorded with this technique and import those data into a virtual tooth arrangement program where teeth can be articulated and then export the data to a milling device for the fabrication of the complete dentures. A prototype 3-D tooth arrangement program is described in this article that serves as an example of the type of program than can be used to arrange prosthetic teeth virtually as part of the overall CAD/CAM fabrication of complete dentures. PMID:22230914

Goodacre, Charles J; Garbacea, Antoanela; Naylor, W Patrick; Daher, Tony; Marchack, Christopher B; Lowry, Jean

2012-01-01

226

Scanning electron microscopic examination of different cleaners: surface contaminant removal from dentures.  

PubMed

Dentures were examined by scanning electron microscopy to evaluate removal of surface contaminants. Five complete dentures were obtained during patient appointments. The palatal surface of each denture was divided into eight pieces (1 cm2) then each sample cleaned with Corega, Dentipur, Fittydent, sodium hypochloride, Savlon, Ipanol, brushing methods and one sample was also kept as a control. They were prepared for SEM examination and photographed at x500. One photograph of each sample was evaluated in random order by three judges for a total of 120 observations. Photographs were compared with one of a clean denture sample. Statistical analysis of the results showed that soaking dentures in sodium hypochloride and Savlon removed significantly more contaminants than any of the other methods used in this study. PMID:9131476

Kulak, Y; Arikan, A; Albak, S; Okar, I; Kazazo?lu, E

1997-03-01

227

Fracture resistance of CAD/CAM-fabricated fiber-reinforced composite denture retainers.  

PubMed

The purpose of this study was to evaluate the fracture resistance of computer-aided design/computer-assisted manufacture (CAD/CAM)-fabricated fiber-reinforced composite (FRC) denture retainers. Distal extension dentures incorporating two telescopic retainers and two molar pontics, with or without fiberglass, were fabricated by CAD/CAM or by the conventional polymerization method. The dentures were subjected to a vertical load on the second molar pontic until fracture. Within each manufacturing method, embedment of the FRC increased the mean final fracture load, suggesting the reinforcing effect of fiberglass. The polymerized dentures with FRC showed greater mean final fracture load than the CAD/CAM dentures with FRC. PMID:23837170

Nagata, Kohji; Wakabayashi, Noriyuki; Takahashi, Hidekazu; Vallittu, Pekka K; Lassila, Lippo V J

2013-01-01

228

Influence of water sorption on mechanical properties of injection-molded thermoplastic denture base resins.  

PubMed

Abstract Objective. This study investigated the influence of water sorption on certain mechanical properties of injection-molded thermoplastic denture base resins. Materials and methods. Six thermoplastic resins (two polyamides, two polyesters, one polycarbonate, one polymethylmethacrylate) and a polymethylmethacrylate (PMMA) conventional heat-polymerized denture-based polymer, selected as a control, were tested. Specimens of each denture base material were fabricated according to ISO 1567 specifications and were either dry or water-immersed for 30 days (n = 10). The ultimate flexural strength, the flexural strength at the proportional limit and the elastic modulus of the denture base materials were calculated. Results. Water sorption significantly decreased the ultimate flexural strength, the flexural strength at the proportional limit and the elastic modulus of one of the polyamides and the PMMAs. It also significantly increased the ultimate flexural strength of the polycarbonate. Conclusion. The mechanical properties of some injection-molded thermoplastic denture base resins changed after water sorption. PMID:24850507

Hamanaka, Ippei; Iwamoto, Misa; Lassila, Lippo; Vallittu, Pekka; Shimizu, Hiroshi; Takahashi, Yutaka

2014-11-01

229

Tensile and shear bond strength of hard and soft denture relining materials to the conventional heat cured acrylic denture base resin: An In-vitro study  

PubMed Central

Background: The condition of the denture bearing tissues may be adversely affected by high stress concentration during function. Chairside Denture (Hard and Soft) reliners are used to distribute forces applied to soft tissues during function. Tensile and shear bond strength has been shown to be dependent on their chemical composition. A weak bond could harbor bacteria, promote staining and delamination of the lining material. To investigate tensile and shear bond strength of 4 different commercially available denture relining materials to conventional heat cured acrylic denture base resin. Materials & Methods: 4 mm sections in the middle of 160 Acrylic cylindrical specimens (20 mm x 8 mm) were removed, packed with test materials (Mollosil, G C Reline Soft, G C Reline Hard (Kooliner) and Ufi Gel Hard and polymerized. Specimens were divided into 8 groups of 20 each. Tensile and shear bond strength to the conventional heat cured acrylic denture base resin were examined by Instron Universal Tensile Testing Machine using the equation F=N/A (F-maximum force exerted on the specimen (Newton) and A-bonding area= 50.24 mm2). One-way ANOVA was used for multiple group comparisons followed by Bonferroni Test and Hsu’s MCB for multiple pairwise comparisons to asses any significant differences between the groups. Results: The highest mean Tensile bond strength value was obtained for Ufi Gel Hard (6.49+0.08 MPa) and lowest for G C Reline Soft (0.52+0.01 MPa). The highest mean Shear bond strength value was obtained for Ufi Gel Hard (16.19+0.1 MPa) and lowest for Mollosil (0.59+0.05 MPa). The Benferroni test showed a significant difference in the mean tensile bond strength and the mean shear bond strength when the two denture soft liners were compared as well as when the two denture hard liners were compared. Hsu’s MCB implied that Ufi gel hard is better than its other closest competitors. Conclusion: The Tensile and Shear bond strength values of denture soft reliners were significantly lower than denture hard reliners. How to cite the article: Lau M, Amarnath GS, Muddugangadhar BC, Swetha MU, Das KA. Tensile and shear bond strength of hard and soft denture relining materials to the conventional heat cured acrylic denture base resin: An In-vitro study. J Int Oral Health 2014;6(2):55-61. PMID:24876703

Lau, Mayank; Amarnath, G S; Muddugangadhar, B C; Swetha, M U; Das, Kopal Anshuraj Ashok Kumar

2014-01-01

230

Association between self-assessment of complete dentures and oral health-related quality of life.  

PubMed

The purpose of this study was to determine which factors related to patient self-assessment of dentures are associated with changes in oral health-related quality of life (OHRQoL) among edentulous patients after replacement of complete dentures, and to determine whether masticatory performance as determined using an objective method affects the changes in OHRQoL among edentulous patients. As a preliminary study, the existing questionnaire regarding self-assessment of dentures consisting of 39 question items, measured with a 100-mm visual analogue scale, was analysed by factor analysis. Then a questionnaire, composed of 22 question items, was developed containing six subscales of 'function', 'lower denture', 'upper denture', 'expectation', 'aesthetic and speech' and 'importance'. Final participants in the present study comprised 93 edentulous patients requiring new conventional complete dentures (44 men, 49 women; mean age, 75·0 years). These patients were asked to complete the Japanese version of the Oral Health Impact Profile (OHIP)-EDENT, comprising 19 question items for assessment of OHRQoL in edentulous patients, along with the developed questionnaire regarding self-assessment of dentures. Moreover, masticatory performance was measured using a colour-changeable chewing gum. The questionnaire and measurement were completed twice; before and after replacement of complete dentures. Stepwise multiple regression analysis identified 'lower denture' and 'aesthetic and speech' as significant independent variables besides OHIP-EDENT scores before replacement. These results suggest that sufficient retention of lower dentures and appropriate appearance may lead to improved OHRQoL in edentulous patients. PMID:22943500

Komagamine, Y; Kanazawa, M; Kaiba, Y; Sato, Y; Minakuchi, S; Sasaki, Y

2012-11-01

231

Evaluation of efficacy of commercial denture cleansing agents to reduce the fungal biofilm activity from heat polymerized denture acrylic resin: An in vitro study  

PubMed Central

Aims: To compare and evaluate Candida removing effects of three most commonly available varieties of commercial denture cleansers from heat polymerized acrylic resins. To compare and evaluate Candida lytic effects of denture cleansers. To assess the effect of time on ability of denture cleansers in reducing Candidal biofilm. Materials and Methods: A specially designed metal mold was fabricated to obtain wax plates of uniform dimensions which were used to fabricate heat cure acrylic resin plates. A square-shaped window of dimension 15 mm and thickness of 1.5 mm was provided in metal mould to simulate thickness of denture base. All samples used in this study were prepared using this mould. Candida albicans colonies were then cultured on this acrylic resin plates by colonization assay. Yeast removing test for samples was performed using microscope and yeast lytic test was performed using photo colorimeter. Results: Denture cleanser D2 showed the highest Candida removing activity when compared with cleansers D1, D3, and control solution. Denture cleansers D2 showed increased yeast lytic ability when compared with denture cleansers D1, D3, and control solution. More time span shared a definite influence on yeast lytic ability of denture cleansers. Conclusions: The effect of cleansing agents on removal of colonized yeasts particularly fungal biofilm from acrylic resins was assessed for clinical implications. The observation indicated superior performance of cleanser D2 when compared with D1 and D3 even though they all belong to same chemical group of alkaline peroxide. The increased effectiveness may be due to presence of sodium lauryl sulphate in formula of D2. PMID:22919216

Dhamande, Mithilesh M.; Pakhan, Ashok J.; Thombare, Ram U.; Ghodpage, Shyam L.

2012-01-01

232

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

233

Bronchial dentures as a cause of airway actinomycosis.  

PubMed

A 65-year-old man was referred to the respiratory clinic with recurrent chest infections on a background of stage 3 chronic obstructive pulmonary disease. On examination, there was wheeze bilaterally more marked on the left lower lobe. Subsequent imaging revealed an obstruction of the left main bronchus that was concerning for malignancy. Initially, on flexible bronchoscopy, a hard mass was found and multiple biopsies were positive for actinomycosis. Subsequent rigid bronchoscopy was undertaken and a set of dentures were removed from the airway. PMID:25150232

Murray, Michelle A; Rogan, Mark P; Morgan, Ross K; Linnane, Seamus J

2014-01-01

234

Bonding auto-polymerising acrylic resin to acrylic denture teeth.  

PubMed

This study investigated the effect of surface treatments on the shear bond strength of an auto-polymerising acrylic resin cured to acrylic denture teeth. The surface treatments included a combination of grit-blasting and/or wetting the surface with monomer. Samples were prepared and then stored in water prior to shear testing. The results indicated that the application of monomer to the surface prior to bonding did not influence the bond strength. Grit blasting was found to significantly increase the bond strength. PMID:19839190

Nagle, Susan; Ray, Noel J; Burke, Francis M; Gorman, Catherine M

2009-09-01

235

Development and Validation of an In Vivo Candida albicans Biofilm Denture Model?  

PubMed Central

The most common form of oral candidiasis, denture-associated stomatitis, involves biofilm growth on an oral prosthetic surface. Cells in this unique environment are equipped to withstand host defenses and survive antifungal therapy. Studies of the biofilm process on dentures have primarily been limited to in vitro models. We developed a rodent acrylic denture model and characterized the Candida albicans and mixed oral bacterial flora biofilm formation, architecture, and drug resistance in vivo, using time course quantitative culture experiments, confocal microscopy, scanning electron microscopy, and antifungal susceptibility assays. We also examined the utility of the model for measurement of C. albicans gene expression and tested the impact of a specific gene product (Bcr1p) on biofilm formation. Finally, we assessed the mucosal host response to the denture biofilm and found the mucosal histopathology to be consistent with that of acute human denture stomatitis, demonstrating fungal invasion and neutrophil infiltration. This current oral denture model mimics human denture stomatitis and should be useful for testing the impact of gene disruption on biofilm formation, studying the impact of anti-infectives, examining the biology of mixed Candida-oral bacterial flora biofilm infections, and characterizing the host immunologic response to this disease process. PMID:20605982

Nett, Jeniel E.; Marchillo, Karen; Spiegel, Carol A.; Andes, David R.

2010-01-01

236

Impacts of wearing complete dentures on bolus transport during feeding in elderly edentulous.  

PubMed

Prosthetic treatment with dentures is often required for the elderly who have reduced swallowing function. Therefore, it is important to understand the relationship between denture-wearing and feeding function from the perspective of swallowing. To clarify changes in bolus transport during feeding in elderly edentulous patients with or without complete dentures. Subjects were 15 elderly edentulous volunteers who were treated with maxillary and mandibular complete dentures. The test food was 10 g of minced agar jelly containing barium sulphate with a particle diameter of 4·0-5·6 mm. Lateral videofluoroscopy was performed to assess the position of the leading edge of the bolus, the bolus volume in each area at swallow onset, bolus transit time and the mandibular position during pharyngeal swallowing. There were significant changes between the bolus transport with and without dentures. Without dentures, the leading edge of the bolus at swallow onset fell from the valleculae area to the hypopharynx, and the bolus volume in the hypopharynx increased. Bolus transit time increased in the oral cavity, valleculae and hypopharynx. The mandibular position shifted anterosuperior direction. The results arose owing to anatomical changes in the oral and pharyngeal structure and the following functional changes: poor food manipulation, poor bolus formation and delayed swallowing reflex. Removing dentures in elderly edentulous individuals influences bolus transport during feeding, resulting in the exacerbation of the reduced swallowing reserve capacity that accompanies ageing, and may increase the risk of dysphagia. PMID:24237359

Yamamoto, H; Furuya, J; Tamada, Y; Kondo, H

2013-12-01

237

Effect of chewing on dental patients with total denture: an experimental study.  

PubMed

In this study, we have explored the prospect of assessing and following level of total denture adaptation by use of EMG signals recorded during gum chewing. Total of 14 edentulous patients, 6 women and 8 men, with an average age of 63±9 years, were recruited. Separate EMG recordings were obtained from left and right temporalis and masseter muscles of the patients for a period of 10 seconds, while they were chewing a sugar-free gum on their left and right sides. EMG recordings were repeated at three times: before, right after, and six months after the placement of the denture. We have tried to standardize environmental and individual factors during EMG recordings. The EMG data have been pre-processed and analyzed using Discrete Wavelet Transform (DWT) and obtained features were statistically evaluated using the paired sample t-test. Chewing activity on the right and left side is analyzed by making comparisons of muscle activity between before and right-after cases and before and six-months-after denture fixation cases. A comparison between right and left side mastication is also made at different time points. We have suggested and implemented a new test and comparison procedure in order to assess adaptation to denture fixation using EMG analysis. In this study, the results indicate that DWT based EMG analysis is instrumental in evaluating denture adaptation and as time progresses the adaptation to denture and hence chewing efficiency increases in patients with total denture replacement. PMID:23504412

Tokmakci, Mahmut; Zortuk, Mustafa; Asyali, Musa Hakan; Sisman, Yildiray; Kilinc, Halil Ibrahim; Ertas, Elif Tarim

2013-12-01

238

Effectiveness of Photodynamic Therapy for the Inactivation of Candida spp. on Dentures: In Vitro Study  

PubMed Central

Abstract Objective: This in vitro study evaluated the effectiveness of photodynamic therapy (PDT) for the inactivation of different species of Candida on maxillary complete dentures. Background data: The treatment of denture stomatitis requires the inactivation of Candida spp. on dentures. PDT has been reported as an effective method for Candida inactivation. Methods: Reference strains of C. albicans, C. glabrata, C. tropicalis, C. dubliniensis and C. krusei were tested. Thirty-four dentures were fabricated in a standardized procedure and subjected to ethylene oxide sterilization. The dentures were individually inoculated with one of the strains and incubated at 37°C for 24?h. Dentures submitted to PDT (P+L+) were individually sprayed with 50?mg/L of Photogem® (PS) and, after 30?min, illuminated by LED light for 26?min (37.5?J/cm2). Additional dentures were treated only with PS (P+L-) or light (P-L+) or neither (P-L-). Samples of serial dilutions were spread on Sabouraud dextrose agar and incubated at 37°C for 48?h. The colonies were counted and the values of log (cfu/mL) were analyzed by Kruskall-Wallis and Dunn tests (p<0.05). Results: For all species of Candida, PDT resulted in significant reduction (p<0.05) of cfu/mL values from dentures when compared with P-L- (reductions from 1.73 to 3.99 log10). Significant differences (p<0.05), but lower reductions, were also observed for P+L- and P-L+when compared with P-L- for some species of Candida. Conclusions: PDT was an effective method for reducing Candida spp. on dentures. PMID:21916614

Mima, Ewerton Garcia de Oliveira; Ribeiro, Daniela Garcia; Dovigo, Livia Nordi; Vergani, Carlos Eduardo; Bagnato, Vanderlei Salvador

2011-01-01

239

A novel design solution to the fraenal notch of maxillary dentures.  

PubMed

This study investigates a novel design feature for the fraenal notch of maxillary dentures, using computational and experimental methods, and shows that its use could significantly increase the longevity of the prosthesis. A two-step process can be used to create the design feature with current denture base materials, but would be highly dependent on the individual skill of the dental technician. Therefore, an alternative form of manufacture, multi-material additive layer manufacture (or '3D printing'), has been proposed as a future method for the direct production of complete dentures with multi-material design features. PMID:24261104

White, J A P; Bond, I P; Jagger, D C

2013-09-01

240

[Observations on before and after employ of screw of implant denture with SEM].  

PubMed

The loss of screw is one of the clinic complication in MDIC implant denture cases. The purpose of this study is to find the cause of loss of screw. The authors has studied MDIC implant denture with SEM before and after employ of the screw and found that the causes of screw loss were crevice corrosion and friction pressure. Crevice corrosion may promote the loss of screw. Base the above condition, it is necessary to select Ti-alloy screw and associat with anticorrosive measure in MDIC implant denture construction. PMID:10677963

Song, Y; Xu, J; Ma, X

1997-03-01

241

Prosthodontic management of worn dentition in pediatric patient with complete overlay dentures: a case report.  

PubMed

Overlay complete dentures are simple, reversible and economical treatment modality for patients with congenital or acquired disorders that severely affect the tooth development. It satisfies both the esthetic and functional demands where the extraction of teeth is not generally indicated. In pediatric patients, the overlay dentures establish a relatively stable occlusion that improves patient's tolerance to the future treatment procedures for worn dentition. This clinical report highlights the imperative need of appropriate treatment strategy and application of maxillary and mandibular overlay dentures in a pediatric patient who suffered from congenitally mutilated and worn dentition. PMID:23236577

Kumar, Prince; Rastogi, Jyoti; Jain, Chandni; Singh, Harkanwal Preet

2012-11-01

242

21 CFR 872.3760 - Denture relining, repairing, or rebasing resin.  

... Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3760 Denture relining, repairing, or rebasing resin. (a)...

2014-04-01

243

Effects of chairside polishing and brushing on surface roughness of acrylic denture base resins  

Microsoft Academic Search

The effects of 3 chairside polishing kits and mechanical brushing on the surface roughness of 3 different acrylic denture\\u000a base resins were compared. Acrylic denture base resins (auto-polymerizing, heat-polymerizing, injected heat-polymerizing resins)\\u000a were examined after a tungsten carbide bur, and after chairside polishing using 3 polishing kits and pumice. The specimens\\u000a were subjected to mechanical brushing using a wear tester

Seung-Kyun Kim; Ju-Mi Park; Min-Ho Lee; Jae-Youn Jung; Shipu Li; Xinyu Wang

2009-01-01

244

Bond of acrylic teeth to different denture base resins after various surface-conditioning methods.  

PubMed

The study examined the bond between different denture base resins and highly cross-linked acrylic denture teeth with different base surface-conditioning methods. One hundred fifty highly cross-linked resin denture teeth (SR-Antaris, No. 11, Ivoclar-Vivadent, FL) were divided into five groups with different surface-conditioning methods of the base surfaces of the teeth (C = control, no surface conditioning, MM = application of methyl methacrylate monomer, SB = sand blasting, SBB = sand blasting + bonding agent, TSS = tribochemical silica coating + silanization). Teeth were bonded to either a cold-cured denture base resin (ProBase Cold, Ivoclar-Vivadent, FL) or heat-cured denture base resins (SR Ivocap Plus, Ivoclar-Vivadent, FL and Lucitone 199, Dentsply, USA). After 24 h of storage in distilled water, compressive load was applied at 90° on the palatal surface of each tooth until fracture. Median failure load ranged between 103 and 257 N for Probase Cold groups, 91 to 261 N for Lucitone 199, and 149 to 320 N for SR Ivocap Plus. For Probase Cold, significant highest failure loads resulted when teeth were treated with SB, SBB, or TSS. For Lucitone 199, significant highest failure loads has been found with MM and TSS treatment. For SR Ivocap Plus, highest failure loads resulted using SBB and TSS. Conditioning of the base surfaces of the teeth prior to denture base processing is highly recommended. Tooth bond is significantly affected by the surface-conditioning method and applied denture base resin. Tribochemical silica coating + silanization method can be recommended for pre-treatment of teeth applying either heat-cured or cold-cured denture base resin. PMID:21181215

Lang, Reinhold; Kolbeck, Carola; Bergmann, Rainer; Handel, Gerhard; Rosentritt, Martin

2012-02-01

245

[The effect of postpalatal seal on the retention of a full upper denture].  

PubMed

The retention of a full upper denture is seriously affected by the border seal and especially by a correct and strong postpalatal seal, which occurred before the receiving of the final impression. In this article we describe the effects of a correct and strong pospalatal seal on the function of a full upper denture, as well as the procedure that should be followed in order to achieve a correct posterior palatal seal. PMID:2486362

Tsirmbas, M; Vlissidis, D

1989-01-01

246

Peel strength of denture liner to PMMA and polyamide: laser versus air-abrasion  

PubMed Central

PURPOSE This study investigated the effect of laser parameters and air-abrasion on the peel strength of silicon-based soft denture liner to different denture resins. MATERIALS AND METHODS Specimens (N=180) were prepared out of three different denture base resins (Rodex, cross-linked denture base acrylic resin; Paladent, heat-cured acrylic resin; Deflex, Polyamide resin) (75 mm × 25 mm × 3 mm). A silicon-based soft denture liner (Molloplast B) was applied to the denture resins after the following conditioning methods: a) Air-abrasion (50 µm), b) Er,Cr:YSGG laser (Waterlase MD Turbo, Biolase Technology) at 2 W-20 Hz, c) Er,Cr:YSGG laser at 2 W-30 Hz, d) Er,Cr:YSGG laser at 3 W-20 Hz, e) Er,Cr:YSGG laser at 3 W-30 Hz. Non-conditioned group acted as the control group. Peel test was performed in a universal testing machine. Failure modes were evaluated visually. Data were analyzed using two-way ANOVA and Tukey's test (?=.05). RESULTS Denture liner tested showed increased peel strength after laser treatment with different parameters (3.9±0.4 - 5.58±0.6 MPa) compared to the control (3.64±0.5 - 4.58±0.5 MPa) and air-abraded groups (3.1±0.6 - 4.46±0.3 MPa), but the results were not statistically significant except for Paladent, with the pretreatment of Er,Cr:YSGG laser at 3 W-20 Hz. Polyamide resin after air-abrasion showed significantly lower peel strength than those of other groups (3.1±0.6 MPa). CONCLUSION Heat-cured acrylic resin, PMMA, may benefit from Er,Cr:YSGG laser treatment at 3 W-20 Hz irradiation. Air-abrasion of polyamide resins should be avoided not to impair their peel bond strengths to silicon-based soft denture liners. PMID:24049570

Bagis, Bora; Ozcan, Mutlu; Durkan, Rukiye; Turgut, Sedanur; Ates, Sabit Melih

2013-01-01

247

Dental application of glass cloth to denture: dimensional accuracy in reinforced resins  

Microsoft Academic Search

Duplicate dentures were made from heat-cured (HC) and microwave-cured (MC) bases, and with these bases reinforced with glass cloth. The clearance as a dimensional change in the resins was measured in relation to duplicate gypsum models from a master denture model. The clearance value in resins stored in distilled water at 37°C demonstrated better dimensional accuracy as compared with base

J. Nitanda; K. Wakasa; H. Matsui; Y. Kasahara; M. Yamaki; A. Matsui

1992-01-01

248

Brazilian Green Propolis Compared to Miconazole Gel in the Treatment of Candida-Associated Denture Stomatitis  

PubMed Central

Aim. To evaluate the efficacy of Brazilian green propolis in comparison to miconazole gel in the treatment of Candida-associated denture stomatitis. Methods. Forty-five denture stomatitis patients, with palatal mucosa erythema levels classified according to Newtons's criteria and with positive culture to Candida spp., were randomly divided into three treatment groups: 15 received miconazole gel 2%, 15 received propolis gel 2,5%, and 15 received propolis 24% for mouthwash. After four daily use lasting two weeks, they were reexamined for the denture stomatitis degree and for a second culture of Candida. The Wilcoxon's test was applied to compare the results of clinical classification of the denture stomatitis and the Candida spp. colonies numbers, before and after each treatment. The Kruskall-Wallis's test was used to compare efficacy among the three treatment groups. Results. There were a significant reduction or complete remission of denture stomatitis (P < 0.05) and a significant decrease of Candida colonies for the three groups (P < 0.05). There was no difference in the efficacy among the treatment groups (P > 0.05). Conclusion. Brazilian green propolis has a similar effect as miconazole in the treatment of Candida-associated denture stomatitis being an alternative in the therapeutics of this condition. PMID:23737855

Capistrano, Herminia Marques; de Assis, Eliene Magda; Leal, Rosana Maria; Alvarez-Leite, Maria Eugenia; Brener, Sylvie; Bastos, Esther Margarida Alves Ferreira

2013-01-01

249

The impact of frenulum height on strains in maxillary denture bases  

PubMed Central

PURPOSE The midline fracture of maxillary complete dentures is a frequently encountered complication. The purpose of this study was to assess the effect of frenulum height on midline strains of maxillary complete dentures. MATERIALS AND METHODS A removable maxillary complete denture was fabricated and duplicated seven times. Four different labial frenulum heights were tested for stresses occurring on the palatal cameo surface. The strains were measured with strain gauges placed on 5 different locations and the stresses were calculated. To mimic occlusal forces bilaterally 100 N of load was applied from the premolar and molar region. RESULTS A statistically significant association between the height of the labial frenulum and the calculated stresses and strains was shown (P<.05) predominantly on the midline and especially on the incisive papilla. The results showed that stress on the anterior midline of the maxillary complete denture increases with a higher labial frenulum. CONCLUSION Within the limitations of this in vitro study, it can be concluded that the stress on the anterior midline of the maxillary complete denture increases with a higher labial frenulum. Surgical or mechanical precautions should be taken to prevent short-term failure of maxillary complete dentures due to stress concentration and low cycle fatigue tendency at the labial frenulum region. PMID:24353878

Bilhan, Hakan; Baysal, Gokhan; Sunbuloglu, Emin; Bozdag, Ergun

2013-01-01

250

Addition of a pontic to all-ceramic Turkom-Cera fixed partial denture restorations  

PubMed Central

High-strength all-ceramic materials are commonly used in dentistry. When complications occur in an all-ceramic restoration, the restoration is usually replaced. This article describes the time-saving ability and cost-effectiveness of this novel technique for the addition of a pontic in two complicated clinical cases. Turkom-Cera™ [Turkom-Ceramic (M) Sdn. Bhd.] with aluminum oxide (99.98%) is an all-ceramic system that offers the option of addition of a new pontic to the sintered framework. The new pontic was cut off from an alumina blank [Turkom-Ceramic (M) Sdn. Bhd.], moistened, and attached to the framework using alumina gel [Turkom-Ceramic (M) Sdn. Bhd.]. The framework was veneered with veneering porcelain (Vita VM 7; VITA Zahnfabrik). The two cases presented here involving the addition of a pontic to sintered framework were followed up for at least 1 year. No complication was detected or reported by the patients. Alumina- and zirconia-based ceramics are particularly suitable for for all-ceramic restorations in high-stress bearing areas. However, replacement of a failed all-ceramic restoration is not the most practical solution, considering both cost and tooth-related factors. This attractive feature of the Turkom-Cera allows the repair of a fractured ceramic coping or the addition of a new pontic to restorations. PMID:24883033

Uludag, Bulent; Tokar, Emre; Polat, Serdar

2013-01-01

251

Rehabilitation of lost vertical dimension with cast post core and cast partial denture.  

PubMed

Loss of teeth is sometimes inevitable. But, it is the duty of a restorative dentist to restore the loss of teeth in way keeping in mind the discomfort and agony of the patient. Rehabilitation of these types of patients requires thorough knowledge and great skills on the part of a prosthodontist. This clinical case report describes the management of a 58-year-old male patient with a loss of mandibular posterior teeth and severely attrited anterior teeth opposing natural teeth. The treatment plan was to restore the loss of teeth and the loss of vertical dimension by providing prosthesis keeping in mind the occlusion and stomatognathic system. A novel approach of fixed and removable type of prostheses was implemented and successfully delivered. PMID:23813994

Gupta, Kavita; Javiya, Piyush; Kumar, Prachur; Mallikarjuna, Rachappa

2013-01-01

252

Retention force of T-bar clasps for titanium and cobalt-chromium removable partial dentures  

Microsoft Academic Search

The objective of this study was to evaluate the retention force of T-bar clasps made from commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) alloy by the insertion\\/removal test simulating 5 years use. Thirty-six frameworks were cast from CP Ti (n=18) and Co-Cr alloy (n=18) with identical prefabricated patterns on refractory casts from a distal extension mandibular hemi-arch segment. The

Renata Cristina; Silveira RODRIGUES; Érica Miranda de Torres; Maria da Glória; Ricardo Faria Ribeiro

2008-01-01

253

Three-month change in the radiodensity of alveolar bone supporting partial-denture abutment teeth.  

PubMed

This study uses the intraoral microdensitometric method to examine the impact of masticatory pressure on the alveolar bone around the abutment teeth clasp. Two retroalveolar radiographs were carried out on all 30 subjects over a period of 3 months using a copper calibration stepwedge. The dental radiographs were digitized and converted into positive. Grey level values on dental radiographs in the alveolar bone area in 7 region of interest (ROI) were measured. They were converted into the equivalent thickness of the calibration stepwedge using mathematical methods and the difference of the bone density between the two radiographs was calculated. The results demonstrated that there were no statistically significant differences between the 1st and 2nd radiographs in any of ROI (p > 0.05). PMID:12674851

Kovacevi?, D; Deli?, Z; Celebi?, A; Kovac, Z; Grzi?, R; Uhac, I; Zlatari?, D Knezovic

2002-12-01

254

Overlay removable partial dentures for a patient with ectodermal dysplasia: A clinical report  

Microsoft Academic Search

The orofacial characteristics of ectodermal dysplasia include anodontia or hypodontia, hypoplastic conical teeth, underdevelopment of the alveolar ridges, frontal bossing, a depressed nasal bridge, protuberant lips, and hypotrichosis. Patients with this disease often need complex prosthetic treat- ment. The options for a definitive treatment plan may include fixed, removable, or implant-supported prostheses, singly or in combination. However, financial constraints and

Ana Claudia Pavarina; Carlos Eduardo Vergani; Eunice Teresinha Giampaolo

255

Overlay removable partial dentures for a patient with ectodermal dysplasia: A clinical report  

Microsoft Academic Search

The orofacial characteristics of ectodermal dysplasia include anodontia or hypodontia, hypoplastic conical teeth, underdevelopment of the alveolar ridges, frontal bossing, a depressed nasal bridge, protuberant lips, and hypotrichosis. Patients with this disease often need complex prosthetic treatment. The options for a definitive treatment plan may include fixed, removable, or implant-supported prostheses, singly or in combination. However, financial constraints and other

Ana Claudia Pavarina; Ana Lucia Machado; Carlos Eduardo Vergani; Eunice Teresinha Giampaolo

2001-01-01

256

Mechanical evaluation and fem analysis of stress in fixed partial dentures zirconium-ceramic  

PubMed Central

SUMMARY Objective. Over the last several years, the Finite Element Analysis (FEM) has been widely recognized as a reference method in different fields of study, to simulate the distribution of mechanical stress, in order to evaluate the relative distribution of loads of different nature. The aim of this study is to investigate through the FEM analysis the stress distribution in fixed prostheses that have a core in Zirconia and a ceramic veneer supported by implants. Materials and methods. In this work we investigated the mechanical flexural strength of a ceramic material (Noritake®) and a of zirconium framework (Zircodent®) and the effects of the manufacturing processes of the material commonly performed during the production of fixed prostheses with CAD/CAM technology. Specifically three point bending mechanical tests were performed (three-point-bending) (1–3), using a machine from Test Equipment Instron 5566®, on two structures in zirconium framework-ceramic (structures supported by two implant abutments with pontic elements 1 and 2). A further in-depth analysis on the mechanical behavior in flexure of the specimens was conducted carrying out FEM studies in order to compare analog and digital data. Results. The analysis of the data obtained showed that the stresses are distributed in a different way according to the intrinsic elasticity of the structure. The analysis of FPD with four elements, the stresses are mainly concentrated on the surface of the load, while, in the FPD of three elements, much more rigid, the stresses are concentrated near the inner margins of the abutments. The concentration of many stresses in this point could be correlated to chipping (4) that is found in the outer edges of the structure, as a direct result of the ceramic brittleness which opposes the resilience of the structure subjected to bending. Conclusions. The analysis of the UY linear displacement confirms previous data, showing, in a numerical way, that the presence of the ceramic is related to the lowering of the structure. So, the reference values are those of the linear lowering obtained in the Mechanical Test and in our FEM analysis. zirconium framework with four elements 4,227 10?2mm.zirconium framework with ceramic structure with four elements 2,266 10?2 mm.That suggests that the presence of ceramics halves the flexion capabilities of the prosthetic materials. PMID:24772262

CARDELLI, P.L.; VERTUCCI, V.; BALESTRA, F.; MONTANI, M.; ARCURI, C.

2013-01-01

257

The combination of a nylon and traditional partial removable dental prosthesis for improved esthetics: a clinical report.  

PubMed

A benefit of a nylon partial removable dental prosthesis (PRDP) is the absence of a metal framework, providing improved esthetics. Unfortunately, the lack of a traditional framework reduces rigidity and the support of occlusal rests. This clinical report describes a combination of a nylon PRDP (polyamide denture base resin) and a traditional PRDP (framework/resin) for a Kennedy Class II, Modification 1, partially edentulous mandible. PMID:23328191

Ito, Masayasu; Wee, Alvin G; Miyamoto, Takanari; Kawai, Yasuhiko

2013-01-01

258

[New use of pulse-oximeter as a prophylactic Stimulator to the wearer and a lifesaving tools for prevention of hypoxic mishaps].  

PubMed

Pulse-oximeter has been widely used for the clinical assessment of physical status of a patient and as an alarming tool of hypoxia to medical personnel at the bedside or in the observation center. However, it has never been used for direct stimulation of the wearer. We considered innovation of pulse-oximeter as a prophylactic alarm-oximeter for the wearer. If SPO2 goes down to unfavorable level, the alarm-oximeter starts to send signal through a control box to a stimulator, such as an electrical nerve stimulator, a cold thermal tip, or mechanical device like a vibrator or compressor. The dermal stimulator is usually fixed to the right or left wrist with a Velcro band. The control box is affixed to the wristband by using Velcro. The alarm may be sent to an earphone or speaker with a verbal command like "take a deep breath". Alarm-oximeter will be combined to an oxygen inhaler or mechanical ventilatory assist device, or a drug administration system through electric line or wireless transmitter to start or change its function before the arrival of medical personnel. It will prevent hypoxic mishaps during medical intervention or sleep apnea syndrome. It will be also applicable to stop snoring. PMID:24724452

Morioka, Tohru; Terasaki, Hidenori

2014-03-01

259

21 CFR 801.405 - Labeling of articles intended for lay use in the repairing and/or refitting of dentures.  

Code of Federal Regulations, 2013 CFR

...refitted dentures may cause acceleration of bone resorption, soft tissue hyperplasia...home-repaired dentures may cause faster bone loss, continuing irritation, sores, and...use of this product may lead to faster bone loss, continuing irritation, sores,...

2013-04-01

260

21 CFR 801.405 - Labeling of articles intended for lay use in the repairing and/or refitting of dentures.  

Code of Federal Regulations, 2011 CFR

...refitted dentures may cause acceleration of bone resorption, soft tissue hyperplasia...home-repaired dentures may cause faster bone loss, continuing irritation, sores, and...use of this product may lead to faster bone loss, continuing irritation, sores,...

2011-04-01

261

21 CFR 801.405 - Labeling of articles intended for lay use in the repairing and/or refitting of dentures.  

Code of Federal Regulations, 2012 CFR

...refitted dentures may cause acceleration of bone resorption, soft tissue hyperplasia...home-repaired dentures may cause faster bone loss, continuing irritation, sores, and...use of this product may lead to faster bone loss, continuing irritation, sores,...

2012-04-01

262

Effect of various chemicals on the bond strength of acrylic tooth and denture base -An Invitro comparative study  

PubMed Central

Background: Debonding of acrylic teeth from the denture base is a common problem. Certain clinical conditions like ridge prominence leads to excess trimming of acrylic teeth and base, resulting in a weak interface. The denture base polymer debonds adhesively in the region of the highly cross –linked matrix of the teeth. To compare the effect of different chemical surface treatments on the bond between cross-linked acrylic teeth and different types of denture base material. Materials & Methods: A total of 180 wax specimens were fabricated and divided into 3 groups: Heat-cure, high impact heat-cure, flexible denture base material bonded to acrylic teeth. Each group was further subdivided into 6 subgroups with 10 specimens each according to the surface treatment ofthe ridge lap area: control, monomer, acetone 99%, chloroform 99%, acrylic adhesive cyanoacrylate, ethyl acetate 99%. After processing, specimens were tested for bond strength using a universal testing machine. The resulting bond strengths were recorded, statistically analyzed and compared. Results: Among all the 3types of denture base resins, highimpact heat-cure denture base resin gave highest bond strength. There was no bonding of teeth with flexible denture base material. Chemical surface treatment of acrylic teeth with ethyl acetate gave highest bond strength followed by control, chloroform, acetone and cyanoacrylate groups. Conclusion: Among all the 3types of denture base materials, high-impact heat-cure denture base resin gave highest bond strength with ethyl acetate surface treatment. Simple and quick tooth chemical surface treatment with ethylacetate could be an effective option in decreasing bonding failures and also avoid repeated denture repairs improving patient satisfaction. How to cite the article: Krishna VP, Premalatha A, Babu PJ, Raju DS, Kumar MP, Rao DB. Effect of various chemicals on the bond strength of acrylic tooth and denture base -An In-vitro comparative study. J Int Oral Health 2014;6(1):100-5. PMID:24653612

Krishna, V Pridhvi; Premalatha, Averneni; Babu, P Jithendra; Raju, D Srinivasa; Kumar, M Praveen; Rao, D Bheemalingeswara

2014-01-01

263

Investigation of bonding properties of denture bases to silicone-based soft denture liner immersed in isobutyl methacrylate and 2-hydroxyethyl methacrylate  

PubMed Central

PURPOSE The purpose of this study was to investigate the bonding properties of denture bases to silicone-based soft denture liners immersed in isobutyl methacrylate (iBMA) and 2-hydroxyethyl methacrylate (HEMA) for various lengths of time. MATERIALS AND METHODS Polymethyl methacrylate (PMMA) test specimens were fabricated (75 mm in length, 12 mm in diameter at the thickest section, and 7 mm at the thinnest section) and then randomly assigned to five groups (n=15); untreated (Group 1), resilient liner immersed in iBMA for 1 minute (Group 2), resilient liner immersed in iBMA for 3 minutes (Group 3), resilient liner immersed in HEMA for 1 minute (Group 4), and resilient liner immersed in HEMA for 3 minutes (Group 5). The resilient liner specimens were processed between 2 PMMA blocks. Bonding strength of the liners to PMMA was compared by tensile test with a universal testing machine at a crosshead speed of 5 mm/min. Data were evaluated by 1-way ANOVA and post hoc Tukey-Kramer multiple comparisons tests (?=0.05). RESULTS The highest mean value of force was observed in Group 3 specimens. The differences between groups were statistically significant (P<.05), except between Group 1 and Group 4 (P=.063). CONCLUSION Immersion of silicone-based soft denture liners in iBMA for 3 minutes doubled the tensile bond strength between the silicone soft liner and PMMA denture base materials compared to the control group. PMID:24843397

Tugut, Faik; Mutaf, Burcu; Guney, Umit

2014-01-01

264

Effects of the position of artificial teeth and load levels on stress in the complete maxillary denture  

Microsoft Academic Search

Statement of Problem. Complete maxillary dentures are subjected to significant variations in force. The influence of tooth position on the stress patterns of a complete maxillary denture during gradual load increases has not been determined. Purpose. This study was designed to measure the effects of the position of artificial teeth and load levels on stress patterns in the complete maxillary

Anthony Prombonas; Dimitris Vlissidis

2002-01-01

265

Durability evaluation of a friction couple intended for implantological stabilization of complete dentures.  

PubMed

The paper presents the results of the study of the titanium implant-elastomeric membrane attachment, conducted from the point of view of potential utilization of the results in forecasting the durability of retention elements representing a new solution of dentures based on implants. The examination was carried out using a device designed by the author, which allowed the simulation of the process of inserting and removing dentures. Titanium counter specimens, simulating implants, were subjected to surface modification through their sandblasting with 350 um and 500 um abrasives, so as to diversify their roughness. The elastomeric membranes constituting a retention element of the attachment were made of a silicone material, Molloplast B. The influence of the number of cycles (one cycle meaning one insertion and removal of a denture) on the attachment's retention force was studied. In order to better reflect the natural conditions, the device was equipped with a chamber which made it possible to perform the examination in an artificial saliva environment. The study has shown that the application of the polymer material Molloplast B for constructing the new type retention elements of dentures based on implants ensures practically constant values of the attachment's retention force in the required 6-month utilization period. After the time of denture usage, being eight times longer than originally assumed, the loss of retention force does not exceed 43% in any of the attachments investigated and the retention force values still allow the attachments to operate, although their effectiveness is partly reduced. PMID:19152467

Chladek, Grzegorz

2008-01-01

266

A mathematical derivation to prove reduced denture retention in v shaped palate.  

PubMed

The impact of oral health on the quality of life of older individuals have significantly increased over the last few decades. Edentulism substantially affect oral and general health and overall quality of life. Complete denture retention is the resistance to displacement of the denture base away from the ridge which is the main source of psychological comfort for the patient. Special retention problems are seen in patients exhibiting highly tapered steep palatal vault. In these cases a metal base or subsequent bench cure reline procedure would be incorporated into the initial treatment plan. In this article, we have derived a mathematical proof for the clinical experience that reduction in the palatal angle, results in lesser denture retention. PMID:24757354

Mathew, Liji; Unni, K N; Vijayakumar

2014-06-01

267

Association between dentures and the rate of falls in dementia  

PubMed Central

Background Poor oral health, chronic diseases, functional decline, and low cognitive ability can increase the risk of falls in the elderly. Objectives The current study aimed to show the effects of oral health, diabetes mellitus (DM), hypertension (HT), heart disease, functional status, and sociodemographic factors on the risk of falls in elderly with dementia. Materials and methods The sample comprised 1,210 Malaysian elderly who were demented and noninstitutionalized. This study was a national cross-sectional survey entitled “Determinants of Health Status among Older Malaysians”. The effects of age, ethnicity, sex differences, marital status, educational level, oral health, DM, HT, heart disease, and functional status on the risk of falls were evaluated. The multiple logistic regression model was used to estimate the effects of contributing variables on the risk of falls in samples. Results The prevalence of falls was approximately 17% in subjects. It was found that age (odds ratio [OR] 1.02), non-Malay ethnicity (OR 1.66), heart disease (OR 1.92), and functional decline (OR 1.58) significantly increased the risk of falls in respondents (P<0.05). Furthermore, having teeth (OR 0.59) and dentures (OR 0.66) significantly decreased the rate of falls (P<0.05). Conclusion It was concluded that age, non-Malay ethnicity, functional decline, heart disease, and oral health significantly affected falls in dementia. PMID:25018658

Eshkoor, Sima Ataollahi; Hamid, Tengku Aizan; Nudin, Siti Sa'adiah Hassan; Mun, Chan Yoke

2014-01-01

268

Methicillin-resistant Staphylococcus aureus and Candida albicans on denture surfaces.  

PubMed

Infectious diseases caused by methicillin-resistant Staphylococcus aureus, MRSA, and Candida albicans are often serious in compromised hosts. We enumerated MRSA and C. albicans on denture surfaces and in saliva samples from 29 adults. Staphylococcus species, MRSA, and methicillin-resistant Staphylococcus epidermidis, MRSE, were detected on 17, 3, and 1 of the 29 denture surfaces, respectively. C. albicans were detected on 22 denture surfaces. All saliva samples from patients whose dentures carried Staphylococcus species and C. albicans were also found to contain both microorganisms. Adherence of isolated 3H labeled cells of MRSA and C. albicans to resin beads and saliva-coated resin beads was examined. Cells of both microorganisms adhered in significantly higher numbers to saliva-coated resin beads than to resin beads. The hydrophobicity of the MRSA isolated from denture surfaces varied from strain to strain; that of C. albicans strains was moderately high. The zeta potentials of MRSA isolates and of C. albicans isolates determined in KCI buffer were significantly low. The potential of the resin beads decreased after treatment with saliva. Two out of 5 MRSA strains were found to be inhibited in growth by oral Streptococcus, Actinomyces, and gram-negative bacterial strains, suggesting that some oral bacterial species play a role in inhibiting the colonization of Staphylococcus species. No isolates of C. albicans were inhibited in their growth by any of the oral bacteria tested. Isolates of MRSA and C. albicans coaggregated with Porphyromonas gingivalis and Fusobacterium nucleatum strains. Using denture cleaners every night for 2 weeks did not reduce numbers of Staphylococcus species or C. albicans organisms in saliva. PMID:9151568

Tawara, Y; Honma, K; Naito, Y

1996-08-01

269

Effect of denture cleansers on Candida albicans biofilm formation over resilient liners  

PubMed Central

PURPOSE The purpose of this study was to analyze the effect of denture cleansers on Candida albicans biofilm formation over resilient liners and to evaluate compatibility between resilient liners and denture cleansers. MATERIALS AND METHODS Acrylic resin (Lucitone 199®) and 3 resilient liners (COE-SOFT™, GC RELINE™ and SOFRELINER TOUGH TOUGH®) were incubated in denture cleansers (Polident® and Cleadent®) for 8 hours a day and in unstimulated saliva for 16 hours a day (n=25/gp) for 60 days. Two-way and three-way repeated measures ANOVA were performed to compare the surface roughness (Ra), pH and C. albicans binding level by radioisotope (?=0.05). The statistical significance of the relation between Ra and adhesion was evaluated by correlation analysis. RESULTS The degree of Ra was significantly decreased in the following order: COE-SOFT™, acrylic resin, GC RELINE™ and SOFRELINER TOUGH®. The immersion in denture cleansers significantly increased Ra of resilient liners, except for SOFRELINER TOUGH® in Cleadent®. No significant differences in pH curves were observed among groups immersed in distilled water and denture cleansers. The binding levels of C. albicans were significantly decreased in the following order: COE-SOFT™, GC RELINE™, SOFRELINER TOUGH®, and acrylic resin. The immersion in Cleadent® seemed to decrease C. albicans binding level on GC RELINE™ and SOFRELINER TOUGH®. CONCLUSION Based on the C. albicans binding levels results, it is not recommended to immerse COE-SOFT™ in denture cleansers, and GC RELINE™ and SOFRELINER TOUGH® should be immersed in Cleadent®. PMID:24843395

Huh, Jung-Bo; Lim, Younghun; Youn, Hye-In; Chang, Brian Myung; Lee, Jeong-Yol

2014-01-01

270

CAD/CAM complete dentures: a review of two commercial fabrication systems.  

PubMed

The use of computer-aided design and computer-aided manufacturing (CAD/CAM) has become available for complete dentures through the AvaDent and Dentca systems. AvaDent uses laser scanning and computer technology. Teeth are arranged and bases formed using proprietary software.The bases are milled from prepolymerized pucks of resin. Dentca uses computer software to produce virtual maxillary and mandibular edentulous ridges, arrange the teeth and form bases. The dentures are fabricated using a conventional processing technique. PMID:23875432

Kattadiyil, Mathew T; Goodacre, Charles J; Baba, Nadim Z

2013-06-01

271

Hinged and sectional complete dentures for restricted mouth opening: A case report and review  

PubMed Central

Restricted mouth opening is a definite prosthodontic hindrance to carry out treatment successfully. Restricted mouth opening can be due to many reasons such as microstomia, oral submucous fibrosis, some genetic disorder, and as a result of some surgical treatment. In the past, various techniques for prosthetic rehabilitation of limited oral opening have been tried such as surgeries, use of dynamic opening devices, magnetic devices, and modification of denture design. Here we present; a simplified technique and simple design for fabrication of maxillary hinged and mandibular hinged and sectional complete denture for a patient with restricted mouth opening due to oral submucous fibrosis. PMID:23853457

Sharma, Aditi; Arora, Pallak; Wazir, Sartaj Singh

2013-01-01

272

Partial priapism.  

PubMed

With only 34 prior cases in world literature, partial priapism (PP), also called partial segmental thrombosis of the corpus cavernosum, is a rare urological condition. The aetiology and treatment of PP is still unclear, but bicycle riding, trauma, drug usage, sexual intercourse, haematological diseases and ?-blockers have been associated with PP. In this case report and world literature review, we describe the case of a 50-year-old man suffering from PP after ingesting 100 mg of sildenafil. The patient was treated with a surgical incision for corpus cavernosum and clot evacuation, as a conservative treatment of PP was not feasible due to severe pain and unresponsiveness to analgesics. PMID:23933863

Hoyerup, Peter; Azawi, Nessn Htum

2013-01-01

273

Evaluation of Cellular Toxicity of Three Denture Base Acrylic Resins  

PubMed Central

Objective This study aimed to evaluate the cellular toxicity of two newly-released acrylic resins (Futura Gen and GC Reline Hard) in comparison with the conventional heat-cure resin (Meliodent). Materials and Methods: Sample discs from each acrylic resin were placed in 24-well culture plates along with L929 mouse fibroblast cell line. A mixture of the RPMI 1640 medium, antibiotics and 10% FBS was added to the plates and the specimens were incubated in a CO2 incubator. The amount of light absorption by each plate was determined after 1 hour, 24 hours and 1 week by the MTT assay and ELISA. The cytotoxic effect of the resins was compared among groups using the two-way ANOVA and further paired comparison was performed using the post-hoc Tukey’s test. Results: After 1 hour, Futura Gen displayed a significantly lower level of light absorption in comparison with Meliodent (P=0.03). After 24 hours, GC Reline Hard rendered a significantly lower level of light absorption compared to Meliodent (P=0.02). After one-week of incubation, the mean absorption rates for GC Reline Hard, Meliodent and Futura Gen were relatively similar (P>0.05). The lowest and highest level of cytotoxicity among all resins were observed after one week and 1 hour of immersion in water, respectively. Conclusion: All the tested resins induced some degree of cytotoxicity. Cytotoxicity of Futura Gen, GC Reline Hard and Meliodent resins failed to show any significant reduction from 24 hours to one week. Thus, it is recommended to immerse the dentures in water for 24 hours prior to delivery to the patient. PMID:23323179

Ebrahimi Saravi, M.; Vojdani, M.; Bahrani, F.

2012-01-01

274

Partial priapism.  

PubMed

We report the third documented case of partial priapism. The proximal right corpus was distended and separated from the distral flaccid corpus by a transverse membrane. Histologic examination revealed the obstructing lesion to be owing to thrombosis of vascular erectile tissue probably secondary to trauma. Excision of this membrane promptly cured the condition. PMID:7411706

Johnson, G R; Corriers, J N

1980-07-01

275

Repair of posterior base of a maxillary complete denture by use of a cast of stone and resilient material.  

PubMed

A method to repair a fractured complete denture and simultaneously augment deficient borders or correct an inadequate posterior palatal seal is described. Corrections were made intraorally with modeling compound and an elastomeric impression material. A resilient impression material was used to block out the undercuts in the denture, and repair was accomplished with visible light-cured resin or an autopolymerizing repair resin. This technique simplifies the laboratory procedures and thereby permits the return of the denture to the patient at the same visit. PMID:8809264

Lee, S; Morgano, S M

1995-11-01

276

Risk management in clinical practice. Part 6a. Identifying and avoiding medico-legal risks in complete denture prosthetics.  

PubMed

The provision of complete dentures is often perceived as a clinical 'black art' as it relies on a blend of clinical skill, scientific evidence and no little artistic interpretation. Coupled to this is a heavy reliance on patient ability to control their dentures in a muscular environment while, hopefully, coping with the various oral functions in addition to appearance. This article deals with the potential problem areas in the provision of complete dentures, reinforcing the importance of practitioners obtaining appropriate informed consent and of maintaining clinical knowledge and skills. PMID:20871548

McCord, J F

2010-09-25

277

Survey of prosthodontic impression procedures for complete dentures in general dental practice in the United Kingdom  

Microsoft Academic Search

Statement of problem. Anecdotal evidence suggests impression techniques used in general dental practice may vary from those taught at dental schools. There is little published information on this topic. Purpose. This study identifies the materials and methods used by general dental practitioners for recording impressions for the provision of replacement of complete dentures. Methods. A total of 905 questionnaires were

T. Paul Hyde; J. Fraser McCord

1999-01-01

278

A method of correcting the posterior palatal seal area of a maxillary complete denture.  

PubMed

A processing technique for correcting the posterior palatal seal area of a maxillary denture has been described. The proper extension and displacement necessary for peripheral seal is reestablished without creating changes in occlusion or esthetics. Since the technique involves heat processing, the same acrylic resin present in the original base may be used, which makes the correction virtually impossible to detect. PMID:390125

Lauciello, F R; Conti, S P

1979-12-01

279

Epilepsy (partial)  

PubMed Central

Introduction About 3% of people will be diagnosed with epilepsy during their lifetime, but about 70% of people with epilepsy eventually go into remission. Methods and outcomes We conducted a systematic review and aimed to answer the following clinical questions: What are the effects of starting antiepileptic drug treatment following a single seizure? What are the effects of drug monotherapy in people with partial epilepsy? What are the effects of additional drug treatments in people with drug-resistant partial epilepsy? What is the risk of relapse in people in remission when withdrawing antiepileptic drugs? What are the effects of behavioural and psychological treatments for people with epilepsy? What are the effects of surgery in people with drug-resistant temporal lobe epilepsy? We searched: Medline, Embase, The Cochrane Library, and other important databases up to July 2009 (Clinical Evidence reviews are updated periodically; please check our website for the most up-to-date version of this review). We included harms alerts from relevant organisations such as the US Food and Drug Administration (FDA) and the UK Medicines and Healthcare products Regulatory Agency (MHRA). Results We found 83 systematic reviews, RCTs, or observational studies that met our inclusion criteria. We performed a GRADE evaluation of the quality of evidence for interventions. Conclusions In this systematic review we present information relating to the effectiveness and safety of the following interventions: antiepileptic drugs after a single seizure; monotherapy for partial epilepsy using carbamazepine, gabapentin, lamotrigine, levetiracetam, phenobarbital, phenytoin, sodium valproate, or topiramate; addition of second-line drugs for drug-resistant partial epilepsy (allopurinol, eslicarbazepine, gabapentin, lacosamide, lamotrigine, levetiracetam, losigamone, oxcarbazepine, retigabine, tiagabine, topiramate, vigabatrin, or zonisamide); antiepileptic drug withdrawal for people with partial or generalised epilepsy who are in remission; behavioural and psychological treatments for partial or generalised epilepsy (biofeedback, cognitive behavioural therapy (CBT), educational programmes, family counselling, relaxation therapy (alone or plus behavioural modification therapy, yoga); and surgery for drug-resistant temporal lobe epilepsy ( lesionectomy, temporal lobectomy, vagus nerve stimulation as adjunctive therapy). PMID:21549021

2011-01-01

280

Evaluation of staining susceptibility of resin artificial teeth and stain removal efficacy of denture cleansers.  

PubMed

Abstract Objective. To assess the staining susceptibility of four acrylic resin (Ivostar, SR Vivodent PE, Major Dent, Integral) and a nanocomposite resin (Veracia) artificial teeth and to evaluate the stain removal efficacy of denture cleansers. Materials and methods. Sixty maxillary incisors of each brand (total = 300) were divided into three groups according to staining solution as coffee, red wine and tea. Baseline color measurements were performed with a spectrophotometer. Specimens were immersed in staining solutions for 14 h (2 h × 7 days) and then second color measurements were performed. Each group was further divided into four sub-groups according to denture cleanser as Corega tabs, Fittydent, NaOCl (0.5%) and distilled water (control) (n = 5). Specimens were immersed in denture cleansers for 8 h and third color measurements were made. Thus, the weekly simulation period was completed. This cycle was repeated 12 times to simulate a 3-month time period and measurements were performed at the end of the 4th, 8th and 12th cycles. ?E values were calculated and data were analyzed with 3-way repeated measures ANOVA and Bonferroni tests. Results. Significant color differences were found among the teeth and staining solutions, but all of the color differences were in the clinically acceptable range (?E < 5.5). Integral showed the highest ?E values for all solutions, while Ivostar and Vivodent demonstrated the lowest ?E values for red wine and tea solutions. There was no significant difference among the denture cleansers in terms of stain removal efficacy. Conclusions. Cross-linked acrylic (Integral) and nanocomposite (Veracia) resin teeth were more susceptible to staining. Denture cleansers were efficient on stain removal from artificial teeth. PMID:24807730

Kurtulmus-Yilmaz, Sevcan; Deniz, Sule Tugba

2014-11-01

281

Oral Crest Lengthening for Increasing Removable Denture Retention by Means of CO2 Laser  

PubMed Central

The loss of teeth and their replacement by artificial denture is associated with many problems. The denture needs a certain amount of ridge height to give it retention and a long-term function. Crest lengthening procedures are performed to provide a better anatomic environment and to create proper supporting structures for more stability and retention of the denture. The purpose of our study is to describe and evaluate the effectiveness of CO2 laser-assisted surgery in patients treated for crest lengthening (vestibular deepening). There have been various surgical techniques described in order to restore alveolar ridge height by pushing muscles attaching of the jaws. Most of these techniques cause postoperative complications such as edemas, hemorrhage, pain, infection, slow healing, and rebound to initial position. Our clinical study describes the treatment planning and clinical steps for the crest lengthening with the use of CO2 laser beam (6–15 Watts in noncontact, energy density range: 84.92–212.31?J/cm2, focus, and continuous mode with a focal point diameter of 0.3?mm). At the end of each surgery, dentures were temporarily relined with a soft material. Patients were asked to mandatorily wear their relined denture for a minimum of 4–6 weeks and to remove it for hygienic purposes. At the end of each surgery, the deepest length of the vestibule was measured by the operator. No sutures were made and bloodless wounds healed in second intention without grafts. Results pointed out the efficiency of the procedure using CO2 laser. At 8 weeks of post-op, the mean of crest lengthening was stable without rebound. Only a loss of 15% was noticed. To conclude, the use of CO2 laser is an effective option for crest lengthening. PMID:25383385

Nammour, Samir; Gerges, Elie; Bou Tayeh, Rima; Zeinoun, Toni

2014-01-01

282

Flexural strength,water sorption and solubility of a methylmethacrylate-free denture base polymer reinforced with glass fibre reinforcement.  

PubMed

A methylmethacrylate-free denture base polymer (Eclipse) in comparison to a conventional denture base polymer (Palapress vario) was evaluated after water saturation and Stick glass fibre reinforcement. The data were analysed with ANOVA at a = 0.05. Water-storage caused a decrease in the flexural strength and stiffness of the materials (p > 0.05). Conventional denture base material with fibre reinforcement gave highest flexural strength (201.1 MPa) compared to fibre reinforced Eclipse (79.1 MPa) (p < 0.05). Water sorption after 76 days was 2.08% (Palapress vario) and 1.55% (Eclipse). Fibre-reinforcement of methylmethacrylate-free material was not as successful as conventional denture base and needs to be further optimized. PMID:24479210

Mutluay, M M; Tezvergil-Mutluay, A; Vallittu, P; Lassila, L

2013-12-01

283

Social determinants of denture/bridge use: Japan gerontological evaluation study project cross-sectional study in older Japanese  

PubMed Central

Background Studies suggest that using a denture/bridge may prevent disability in older people. However, not all older people with few remaining teeth use a denture/bridge. This cross-sectional study aimed to examine the social determinants which promote denture/bridge use among older Japanese. Methods A total of 54,388 (25,630 males and 28,758 females) community-dwelling individuals aged 65 or over, living independently, able to perform daily activities, and with 19 or fewer teeth. The dependent variable was denture/bridge use. Socio-demographics, number of teeth, present illness, social participation, social support, and social networks were used as individual-level independent variables. Data for social capital were aggregated and used as local district (n?=?561 for males, n?=?562 for females) -level independent variables. Number of dentists working in hospitals/clinics per population and population density were used as municipality (n?=?28) -level independent variables. Three-level multilevel Poisson regression analysis was performed for each sex. Results High equivalent income, low number of teeth, present illness, and living in a municipality with high population density were significantly associated with denture/bridge use in both sexes in the fully adjusted models (p?Denture/bridge use was significantly associated with high educational attainment in males and participating in social groups in females in the fully adjusted model (p?denture/bridge use and social capital. Conclusions Denture/bridge use was significantly associated with high economic status and present illness in both sexes, high educational attainment in males, and participation in social groups in females among community-dwelling older Japanese after adjusting for possible confounders. PMID:24894968

2014-01-01

284

A Functional Stress Analysis in the Maxillary Complete Denture Influenced by the Position of Artificial Teeth and Load Levels: an In-vitro Study  

Microsoft Academic Search

The fracture of complete dentures fabricated using Polymethyl methacrylate resin constitutes a challenge to the clinician\\u000a and remains an unresolved problem. To determine whether gradual increase in load or different posterior teeth positions in\\u000a maxillary denture would influence the pattern of stress. Two groups of maxillary dentures were fabricated with different posterior\\u000a teeth positions (Group I with teeth on the

Naik RaviD; D. P. Krishna; Shetty Manoj; Hegde Chethan

2010-01-01

285

EVALUATION OF THREECOMMONDENTURECLEANERS  

Microsoft Academic Search

Denture plaque has been shown to be responsible for a variety of soft tissue changes in many denture wearers. Proper routine cleaning of tissue surface of denture is essential to maintain healthy supporting tissue. The purpose of this study was to quantify and compare the effectiveness of common cleaning agents and toothpaste in the removal of denture plaque from the

A. Margo

286

Incorporation of antimicrobial macromolecules in acrylic denture base resins: a research composition and update.  

PubMed

Contemporary research in acrylic denture base materials focuses on the development of a novel poly(methyl methacrylate) (PMMA) resin with antimicrobial properties. Although PMMA resin has fulfilled all the requirements of an ideal denture base material, its susceptibility to microbial colonization in the oral environment is a formidable concern to clinicians. Many mechanisms including the absence of ionic charge in the methyl methacrylate resins, hydrophobic interactions, electrostatic interactions, and mechanical attachment have been found to contribute to the formation of biofilm. The present article outlines the basic categories of potential antimicrobial polymer (polymeric biocides) formulations (modified PMMA resins) and considers their applicability, biological status, and usage potential over the coming years. PMID:24138425

Sivakumar, Indumathi; Arunachalam, Kuthalingam Subbiah; Sajjan, Suresh; Ramaraju, Alluri Venkata; Rao, Bheemalingeshwara; Kamaraj, Bindu

2014-06-01

287

[Comparative clinical and experimental studies of various denture cleansers. 2. Testing of antimicrobial efficiency].  

PubMed

Agar diffusion plate tests were performed on five strains of micro-organisms to characterize the disinfecting properties of nine denture cleaners. Furthermore, the liberation of oxygen was determined as a function of time, and the course of pH variation of the various cleaning solutions was studied. The highest oxygen concentrations and the best antimicrobic activities were achieved by the preparations Eladent G and T. PMID:790657

Ehmer, D; Bradler, G; Winkler, U

1976-08-01

288

Management of Severe Gag Reflex by An Unique Approach: Palateless Dentures  

PubMed Central

Gagging is most common protective reflex that prevents the foreign bodies from entering trachea. But some patients have abnormally active gag reflex. The purpose of this paper was to describe method of managing gagging patients , based on modified treatment approaches, starting from impression making to design of the prosthesis i.e. palateless denture, to help the patient tolerate prosthesis in his/her mouth. PMID:24298541

Jain, Anoop; V, Vijayalaxmi; Bharathi, R.M.; Patil, Veena; Alur, Jyoti

2013-01-01

289

Effect of high-pressure polymerization on mechanical properties of PMMA denture base resin.  

PubMed

The aim of this study was to assess the effect of high-pressure polymerization on mechanical properties of denture base resin. A heat-curing denture base resin and an experimental PMMA were polymerized under 500MPa of pressure by means of an isostatic pressurization machine at 70°C for 24h to make rectangular specimens whose dimensions were 30mm×2mm×2mm. Each specimen was deflected on a three-point flexural test until either fracture occurred or the sample was loaded up to 8mm in deflection. The molecular weight of the PMMA without filler was analyzed using the high-speed liquid chromatography system. Increased ductility without fracture was shown in the specimens subjected to high pressure, while most of the control specimens (ambient pressure) fractured. The mean toughness of the PMMA specimens polymerized under the high pressure was significantly higher than the same material polymerized under ambient pressure (p<0.01). The high pressure groups of the denture resin and the PMMA revealed a significantly lower mean 0.2% yield stress, flexural strength, and elastic modulus than control groups (p<0.01). There were certain amounts of higher molecular weight polymers in the high pressure specimens than were present in the controls. The increased toughness shown in the PMMA polymerized under the high pressure was presumably attributed to the higher molecular weight produced by the pressure. The result suggests a potential application of the high-pressure polymerization to the development of PMMA-based denture resin with improved fracture resistance. PMID:23455166

Murakami, Natsuko; Wakabayashi, Noriyuki; Matsushima, Rie; Kishida, Akio; Igarashi, Yoshimasa

2013-04-01

290

The effect of cleaning substances on the surface of denture base material  

PubMed Central

Bakcground The aim of this study was to evaluate the effect of substances used for hygienic cleaning of dentures on the surface of the denture base material. Material/Methods Meliodent Heat Cure (Heraeus-Kulzer, Germany) heat-polymerized acrylic resin was used to produce plates with all the characteristics of removable denture bases (subsequently, “plates”). Oral-B Complete toothbrushes of various brush head types were fixed to a device that imitated tooth brushing movements; table salt and baking soda (frequently used by patients to improve tooth brushing results), toothpaste (“Colgate Total”), and water were also applied. Changes in plate surfaces were monitored by measuring surface reflection alterations on spectrometry. Measurements were conducted before the cleaning and at 2 and 6 hours after cleaning. Results No statistically significant differences were found between the 3 test series. All 3 plates used in the study underwent statistically significant (p<0.05changed) – the reflection became poorer. The plates were most affected by the medium-bristle toothbrush with baking soda – the total reflection reduction was 4.82±0.1%; among toothbrushes with toothpaste, the hard-type toothbrush had the greatest reflection-reducing effect – 4.6±0.05%, while the toothbrush with table salt inflicted the least damage (3.5 ± 0.16%) due to the presence of rounded crystals between the bristles and the resin surface. Toothbrushes with water had a uniform negative effect on the plate surface – 3.89±0.07%. Conclusions All substances used by the patients caused surface abrasion of the denture base material, which reduced the reflection; a hard toothbrush with toothpaste had the greatest abrasive effect, while soft toothbrushes inflicted the least damage. PMID:24326781

Zilinskas, Juozas; Junevicius, Jonas; Cesaitis, Kestutis; Juneviciute, Gabriele

2013-01-01

291

Magnet Retained Cheek Plumper in Complete Denture Esthetics: A Case Report  

PubMed Central

This clinical report describes a technique to improve support for sunken cheeks using magnet retained detachable acrylic cheek plumpers. The new generation of magnets with improved technology provides sufficient denture retention for clinical application. However, further follow-up may be necessary to ascertain the long-term usefulness of the magnet-retained prosthesis, because of corrosion and further loss of magnetism. PMID:24910682

Deogade, Suryakant Chhagan

2014-01-01

292

Electrophoresis of tear proteins as a new diagnostic tool for two high risk groups for dry eye: computer users and contact lens wearers  

PubMed Central

Rationale: Dry eye is the most prevalent condition seen by the ophthalmologist, in particular in elderly. The identification of new common risk factors (computer use and contact lens wear) extends the disease among the young people. The early diagnosis of dry eye is essential, but difficult, because the biochemical changes in tear film usually occur before any detectable signs. Due its advantages, electrophoresis of tear proteins could be an important tool for diagnosis of tear film impairment in high risk groups for dry eye. Objective: The role of tear proteins electrophoresis in early diagnosis of dry eye related to computer use and contact lens wear, as well as the biochemical changes in these high risk groups are presented. Methods: This review will summarize the actual data concerning the electrophoretic changes of tear proteins in computer users and contact lens wearers, two common high risk groups for dry eye. Discussion: Electrophoresis of tear proteins using automated system Hyrys–Hydrasys SEBIA France is an important tool for early diagnosis of tear film alterations and monitoring of therapy. The quantification of many proteins in a single analysis using a small quantity of unconcentrated reflex tears is the main advantage of this technique. Electrophoresis of tear proteins should became a prerequisite, in particular for computer users less than 3h/day, as well as at prescribing contact lenses. Abbreviations: DED– dry eye disease, EGF–epidermal growth factor, IL interleukins, MMP–metalloproteinase, ELISA– Enzyme–linked immunosorbent assay, SDS– sodium dodecyl sulfate, CVS– computer vision syndrome, CLRDE– contact lens– related dry eye PMID:22567044

2011-01-01

293

[Foreign dentures and dental tourism--willingness-to-pay and factors influencing the demand for foreign dental prosthesis in Germany].  

PubMed

With the progressive realisation of the single European market, public interest has been directed towards cross-border healthcare services to an increasing extent. More and more dentures are being imported into Germany from foreign countries. Furthermore, patients are becoming ever more mobile, travelling to other countries to receive prosthetic treatment from dentists. The objective of this evaluation was to determine by means of a dedicated questionnaire the patients' individual preferences for foreign dentures and the potential savings. 1?368 individuals between the ages of 30 and 75 years were interviewed within a representative omnibus survey. The evaluation of the individual willingness-to-pay included 4 treatment scenarios, which were assessed by the participants in a "bidding game". Participants could choose between a "crown scenario" and an "implant scenario", both with the subcategories "foreign dentures" and "dental tourism". The direct comparison revealed a preference for the "foreign dentures" option over "dental tourism". Average willingness-to-pay for the dental tourism option in the crown scenario was calculated as 80 Euro, and in the implant scenario as 280 Euro less in comparison with the willingness-to-pay for the foreign dentures option. The willingness to switch to a less expensive dentist was one of the main determinants in the causal explanation for the variance in willingness-to-pay. Quality proved to be the decisive criterion and was indicated by 92.4% participants. A lower price for dentures played a subordinate role and was only stated as the decisive factor by 31.1% participants. In conclusion, the results clearly indicate that the decision for or against foreign dentures and the extent of willingness-to-pay depends on a range of criteria, of which "price" is only one and not the decisive factor. PMID:20571980

Köberlein, J; Klingenberger, D

2011-07-01

294

Photoelastic analysis to compare implant-retained and conventional obturator dentures  

NASA Astrophysics Data System (ADS)

The use of photoelastic analysis contributes to the rehabilitation of patients with oral-sinus-nasal sequelae, which in turn affect important functions such as chewing, swallowing, and speech. The prosthetic rehabilitation with implant-retained dentures is a suitable treatment option. The purpose of this study was to verify, by using a photoelastic analysis, the stress distribution in implant-retained palatal obturator dentures (relined or not) associated with different attachment systems (O-ring, bar-clip, and bar-clip associated with distally placed O-rings). Two photoelastic models were obtained from an experimental maxillary cast presenting an oral-nasal communication. One model had two 13-mm length implants placed on the left region. A total of eight colorless maxillary obturators were fabricated and subsequently four of them were relined with soft silicone soft, and three had attachment systems associated. The assembly (model/attachment system/prosthesis) was positioned in a circular polariscope and a 100-N load was applied at 10 mm/s. The results showed that the denture relining influenced the distribution and amount of stress on the models. The O-ring group displayed the lowest stress levels, followed by bar-clip system associated with distally placed O-rings and bar-clip groups.

Goiato, Marcelo Coelho; Prado Ribeiro, Paula do; Pellizzer, Eduardo Piza; Pesqueira, Aldiéris Alves; Haddad, Marcela Filiè; dos Santos, Daniela Micheline; Moreno, Amália

2012-06-01

295

Comprehensive analysis of repair/reinforcement materials for polymethyl methacrylate denture bases: mechanical and dimensional stability characteristics.  

PubMed

Fracture of complete denture is a common problem as acrylic resins hold inherent limitations. This necessitates affirmation of a selection criterion by evaluating the critical requirements of repair materials. The study intended to evaluate mechanical properties and dimensional stability of common denture base repair and reinforcement materials under standard experimental protocol. Seven types of denture reinforcement materials were chosen. Forty cuboidal samples were made in accordance with ISO 178 for three point bending test and divided to eight groups of five samples each. One group acted as control and samples of seven groups were sectioned and repaired with chosen materials. Five mechanical properties-fracture load, deflection, flexural strength, fracture toughness and elastic modulus were evaluated for all groups. Forty mandibular complete denture specimens were utilized for evaluating fracture load and deflection under loading. Dimensional stability after repair with seven different repair materials was analyzed in two planes (Linear and curvilinear) utilizing separate set of denture samples. Heat cure polymethyl methacrylate with polyethylene fiber was affirmed as material of choice based on this study as it accomplishes the most critical norms of requirement. PMID:24431773

Venkat, R; Gopichander, N; Vasantakumar, M

2013-12-01

296

Influence of high expansion dental stone on the changes in the occlusal vertical dimension of complete dentures.  

PubMed

Although many factors that generate changes in OVD of complete dentures are known, no information is available in the dental literature regarding the effect of using high expansion dental stone (type V) on changes in OVD. This study therefore investigated the effect of a high expansion dental stone on the changes in OVD of complete dentures. A compression moulding technique was used to process twenty sets of simulated upper and lower dentures. Sample was equally divided into two groups: group of type III dental stone (DST III), and group of type V dental stone (DST V). In DST III, the lower, middle and upper parts of flask were filled with type III dental stone; In DST V, the procedure was the same as DST III except for the middle layer that was made of type V high expansion dental stone. Changes in OVD were measured before and after denture processing. A Shapiro-Wilk Normality Test was applied, and then collected data were analysed with t-test statistics for statistically significant differences at the 95% confidence level. The two groups revealed small but statistically significant increase in OVD as a result of processing. The increase in OVD was significantly less in DST V than in DST III. The use of high expansion dental stone can be recommended as investing material to reduce the increase in OVD that occurs after processing complete dentures. PMID:24479215

Salloum, A M

2013-12-01

297

Isolation of epithelial cells from acrylic removable dentures and gender identification by amplification of SRY gene using real time PCR  

PubMed Central

This study evaluates the usefulness of acrylic dentures as the source of DNA for forensic analysis. Thirty-eight samples (21 males and 17 females) were collected and stored for different time periods. The epithelial cells adhered to the dentures were retrieved and the genomic DNA was extracted. All the samples yielded sufficient amount of DNA for analysis irrespective of the storage time. Gender determination was done by amplification of the sex determining region on the Y chromosome (SRY) using real-time polymerase chain reaction with 100% accuracy, within minimal time. With this study, we conclude that saliva-stained acrylic dentures can act as a source of forensic DNA and co-amplification of SRY gene with other routine sex typing markers will give unambiguous gender identification. PMID:21189988

George, Renjith; Sriram, G; Saraswathi, TR; Sivapathasundharam, B

2010-01-01

298

An experimental study on the ergonomics indices of partial pressure suits.  

PubMed

Partial pressure suits (PPSs) are used under high altitude, low-pressure conditions to protect the pilots. However, the suit often limits pilot's mobility and work efficiency. The lack of ergonomic data on the effects of PPSs on mobility and performance creates difficulties for human factor engineers and cockpit layout specialists. This study investigated the effects of PPSs on different ergonomic mobility and performance indices in order to evaluate the suit's impact on pilot's body mobility and work efficiency. Three types of ergonomics indices were studied: the manipulative mission, operational reach and operational strength. Research results indicated that a PPS significantly affects the mobility and operational performance of the wearers. The results may provide mission planners and human factors engineers with better insight into the understanding of pilots' operational function, mobility and strength capabilities when wearing PPS. PMID:23102522

Li, Xianxue; Ding, Li; Hedge, Alan; Hu, Huimin; Qin, Zhifeng; Zhou, Qianxiang

2013-05-01

299

Influence of high expansion dental stone used as investing medium on the changes in occlusal vertical dimension of complete dentures  

PubMed Central

Problem statement Despite advances in materials and techniques, complete dentures made of acrylic resin experience an increase in the occlusal vertical dimension (OVD) during processing. Many factors that affect the OVD of complete dentures are known. However, no study has examined the effect of using high-expansion dental stone (type V) as an investing material on the OVD. Purpose This study investigated the effects of using a high-expansion dental stone as an investing material on changes in the OVD of complete dentures. Material and methods Twenty sets of simulated upper and lower dentures were processed by the compression molding technique. Specimens were equally divided into 2 groups. In the dental stone type III (DST III) group, the lower, middle, and upper parts of a flask were filled with DST III. In the dental stone type V (DST V) group, the procedure was the same as in the DST III group, except that the middle layer was made of high-expansion DST V. Changes in the OVD were measured before and after denture processing. Collected data were analyzed with t-test statistics. Differences were considered statistically significant at the 95% confidence level. Results Both groups showed a small increase in the OVD as a result of processing, but the OVD increase was significantly less in the DST V group compared to the DST III group. Conclusion High-expansion DST V can be recommended as an investing material to reduce the increase in the OVD that may occur while processing complete dentures. PMID:24371379

Salloum, Alaa'a M.

2013-01-01

300

Mathematical Methods for Assessing the Prognostic of Fixed Partial Dentures Resulting from Evaluating a Group of Dental Patients in Romania  

PubMed Central

Based on some mathematical and statistical approaches, our study leads to some conclusions concerning the procedures related to the orodental prosthetics. Occlusal equilibration in orodental prosthetics is a major issue because besides motivating patients for a regular daily oral hygiene, it could significantly increase the longevity of FPR. More dental hygiene information should be given after prosthetic treatment and patients should be motivated to attend recalls on a regular basis for professional teeth-cleaning. Interdental cleaning aids should be explained and the patients have to be motivated to use them at least once a day and the using technique should be individualized. Regarding the application of the deformable models theory, implemented in the context of an expert type software environment, it is known that the fact that modelling by advanced methods and techniques based on the deformable surfaces theory increases the efficiency of the dentofacial prosthetics procedures is a domain of great interest in the actual medical research. PMID:25013455

Mitrea, Alexandru I.; Badea, Iulia Clara; Chifor, Radu; Badea, Mindra Eugenia; Mitrea, Paulina; Popa, Sever; Crisan, Maria; Avram, Ramona

2014-01-01

301

Effect of aging on tear strength and cytotoxicity of soft denture lining materials; in vitro  

PubMed Central

PURPOSE The aim of this in vitro study was to evaluate the effect of aging on the tear strength and cytotoxicity of four soft denture lining materials. MATERIALS AND METHODS Four commonly used soft denture lining materials, (Coe-Comfort™ GC America Inc., Alsip, IL, USA; Coe-Soft™ GC America Inc., Alsip, IL, USA; Visco-gel Dentsply Caulk Milford, DE, USA; and Sofreliner Tough M Tokuyama Dental Corporation Tokyo, Japan) were selected. Sixty trouser-leg designed specimens per lining material were fabricated using a stainless steel mold for tear strength testing. The specimens were divided into non-thermocycling and 1000-, and 3000- thermocycling groups. For the cytotoxicity test, twenty-four disk shaped specimens per material were fabricated using a stainless steel mold. The specimens were soaked in normal saline solution for 24 h, 48 h and 72 h. Cytotoxicity was measured by XTT assay in L929 mouse fibroblasts. Data were analyzed by two way analysis of variance and Dunnett's test (P<.05). RESULTS Before thermocycling, Sofreliner Tough M (10.36 ± 1.00 N) had the highest tear strength value while Coe-Comfort™ (0.46 ± 0.10 N) had the lowest. After 3000 cycles, Sofreliner Tough M (9.65 ± 1.66 N) presented the highest value and Coe-Comfort™ (0.42 ± 0.08 N) the lowest. Sofreliner Tough M, in all incubation periods was the least toxic with significant differences compared to all other materials (P<.05). Coe-Comfort™, Coe-Soft™, and Sofreliner Tough M did not show any significant differences within their material group for all incubation periods. CONCLUSION This in vitro study revealed that aging can affect both the tear strength and cytotoxicity of soft denture materials depending on the composition. PMID:24843396

Landayan, Jordi Izzard Andaya; Manaloto, Adrian Carlos Francisco; Shin, Sang-Wan

2014-01-01

302

An in vitro investigation of water sorption and solubility of two acetal denture base materials.  

PubMed

Acetal resins have been used as an alternative denture base and clasp material recently. The aim of this study was to compare water sorption and water solubility of pink and white acetal resins as compared to a heat-polymerized polymethyl methacrylate resin (PMMA). The tests were performed in accordance with International Standards Organization specification No: 1567. Pink acetal resin showed significantly lower water sorption than heat-polymerized acrylic resin and white acetal resin. PMMA showed significantly higher solubility than pink and white acetal resin. Water sorption and solubility of PMMA, pink and white acetal resins were within the ISO specification limit. PMID:16180637

Arikan, Ayla; Ozkan, Yasemin Kulak; Arda, Tugberk; Akalin, Buket

2005-09-01

303

High-performance liquid chromatographic estimation of eluates from denture base polymers.  

PubMed

A quantitative analytical method using high-performance liquid chromatography is developed to estimate elution profiles of dental acrylic polymers used for denture bases. The method is applied to elution studies in distilled water of resins polymerized by different representative methods. Elution properties or 'leachabilities' vary depending on polymerization conditions. Methyl methacrylate, methacrylic acid and benzoic acid are eluted from autopolymerized resins at the highest eluate concentrations and are followed by heat- and microwave-polymerized resins. These results appear to be comparable to residual amounts of the eluates in resins and their cytotoxic potencies reported. PMID:2732369

Koda, T; Tsuchiya, H; Yamauchi, M; Hoshino, Y; Takagi, N; Kawano, J

1989-04-01

304

The elastomers for complete denture impression: A review of the literature  

PubMed Central

This article reviews the current trends in materials used for complete denture impression. Peer-reviewed articles, published in English and in French between 1954 and 2007, were identified through a MEDLINE search (Pubmed and Elsevier) and a hand search of relevant textbooks and annual publications. Emphasis was made on the characteristics of the elastomers, their manipulation, the different techniques used, and the quality of the impression obtained. The combination of excellent physical properties, handling characteristics, and unlimited dimensional stability assures the popularity of these impression materials. PMID:24151408

Daou, Elie E.

2010-01-01

305

Usage of low-intensity laser radiation for the treatment of the inflammatory processes of the oral cavity mucosa after applying removable plate dentures  

NASA Astrophysics Data System (ADS)

Effective methods of reveling overload zones of the oral mucosa under the bases of plane dentures, the effect of low intensity laser radiation ont he increase of its resistance are discussed. At present removable plate dentures of different modifications to a certain degree restore aesthetic proportions of the face, phonetics and malfunction of the teeth and jaws. Besides, removable bridge are known not to secure even distribution of mastication pressure along the whole dentures bed which results in the development of inflammatory and dystrophic processes, and, finally in the accelerated atrophy of the oral mucosa and bony tissue of the alveolar process of upper and alveolar parts of the mandible. Many papers are devoted to the anti-inflammatory effect of laser therapy. Improvement of metabolic processes and revascularization of the dentures bed mucosa, normalization of the oral microflora structure, anesthetizing effect is noted too. At the same time there are no papers about studying the therapeutic effect of low intensity laser radiation intraumatic dentures stomatitis, inflammation of the oral mucosa in the literature available for us. To increase the functional effectiveness of removable plate dentures, profilaxy of inflammation and dystrophic phenomena and to decrease adaptation period we have developed methods of early detection of overload zone of oral mucosa at the initial stages of acute inflammation with the help of macrohistochemical reaction. Visible with the naked eye for the timely and precise correction of the dentures.

Kalivradzhiyan, Edvard; Lesnykh, Nikolay; Kunin, Vadim; Mutafyan, Mikhail

1995-04-01

306

Efficacy of citric acid denture cleanser on the Candida albicans biofilm formed on poly(methyl methacrylate): effects on residual biofilm and recolonization process  

PubMed Central

Background It is well known that the use of denture cleansers can reduce Candida albicans biofilm accumulation; however, the efficacy of citric acid denture cleansers is uncertain. In addition, the long-term efficacy of this denture cleanser is not well established, and their effect on residual biofilms is unknown. This in vitro study evaluated the efficacy of citric acid denture cleanser treatment on C. albicans biofilm recolonization on poly(methyl methacrylate) (PMMA) surface. Methods C. albicans biofilms were developed for 72 h on PMMA resin specimens (n?=?168), which were randomly assigned to 1 of 3 cleansing treatments (CTs) overnight (8 h). CTs included purified water as a control (CTC) and two experimental groups that used either a 1:5 dilution of citric acid denture cleanser (CT5) or a 1:8 dilution of citric acid denture cleanser (CT8). Residual biofilms adhering to the specimens were collected and quantified at two time points: immediately after CTs (ICT) and after cleaning and residual biofilm recolonization (RT). Residual biofilms were analyzed by quantifying the viable cells (CFU/mL), and biofilm architecture was evaluated by confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Denture cleanser treatments and evaluation periods were considered study factors. Data were analyzed using two-way ANOVA and Tukey’s Honestly Significant Difference (HSD) test (??=?0.05). Results Immediately after treatments, citric acid denture cleansing solutions (CT5 and CT8) reduced the number of viable cells as compared with the control (p?denture cleansers can reduce C. albicans biofilm accumulation and cell viability. However, this CT did not prevent biofilm recolonization. PMID:24957210

2014-01-01

307

Clinical and histopathological changes in palatal mucosa following two treatment modalities in patients wearing maxillary complete dentures with suction cup  

PubMed Central

Aim: The aim of the study was to determine the clinical and histopathological effect on palatal hyperplasia caused by suction cups by different methods of management used for recovery of abused tissues. Materials and Methods: A total of 35 subjects agreed for biopsy procedure, from 50 patients who gave consent for the study. Out of the 35 subjects, 20 were randomly selected for treatment with discontinuation of denture (Group I) and 15 selected for denture relined with tissue conditioner (COE-comfort) (Group II). Punch biopsy procedure was performed on these patients to study the histopathology of the lesion before the two modalities of treatment was administered on them. Results: Inflammation caused by suction cup decreased considerably by both the treatment modalities, i.e., the use of tissue conditioner as well as discontinuation of denture (tissue rest) for a period of 2 weeks. Conclusion: It was concluded that wearing denture day and night considerably increased the severity of inflammatory papillary hyperplasia of palate. Healing was better with tissue conditioner when compared with tissue rest. PMID:24963236

Rao, Yogesh; D'souza, Mariette; Porwal, Amit; Yadav, Pankaj; Kumar, Sheetal; Aggarwal, Amit

2014-01-01

308

Effect of Flask Closure Method and Post-Pressing Time on the Displacement of Maxillary Denture Teeth  

PubMed Central

The purpose of this study was to verify the influence of flask closure methods and post-pressing times on tooth displacement in maxillary dentures. Twenty similar maxillary dentures were made using a heat-polymerized acrylic resin, and randomly assigned to 4 experimental groups (n=5) according to the protocol: 1-conventional flask closure and immediate polymerization; 2- conventional flask closure and polymerization after 6-hour post-pressing time; 3- RS flask closure system and immediate polymerization; and 4- RS flask closure system and polymerization after 6-hour post-pressing time. Three transverse and 2 anteroposterior linear distances between teeth were measured before and after the denture processing with an optical microscope with accuracy of 0.0005mm. Analysis of variance (ANOVA) and Tukey’s test were performed to compare the results. The 6-hour post-pressing time (conventional = 0.44mm and RS = 0.33mm) showed no statistically significant difference in tooth movement, in relation to the flask closure methods, when compared to the immediate time (conventional = 0.40mm and RS = 0.28mm). The RS system standardized the tooth displacement, independently of the post-pressing times. Dimensional changes were more uniform when the dentures were submitted to the 6-hour post-pressing time and RS flask closure method, suggesting that these factors may reduce the magnitude of tooth movement. PMID:19444339

Negreiros, Wagner A; Consani, Rafael L.X; Mesquita, Marcelo F; Sinhoreti, Mario A.C; Faria, Ivan R

2009-01-01

309

INFLUENCE OF THE POLYMERIZATION CYCLE ON THE FLEXURAL STRENGTH OF FOUR DIFFERENT PMMA BASED HEAT-POLYMERIZED DENTURE BASE RESINS  

Microsoft Academic Search

Purpose: PMMA-based heat-polymerized acrylic resins used in the fabrication of denture bases may be cured in different ways. As the polymerization cycle length affects fabrication costs and time, a fast cycle is more advantageous. However, polymerization cycles may influence mechanical properties. Objective: The purpose of this study was to evaluate the influence of the polymerization cycle on the flexural strength

MARCO FERRARI

310

Impact of components of denture acrylic resin on gingival cell growth and sensitivity to Candida albicans adhesion.  

PubMed

The effects of four liquid components of denture acrylic resin on host cell activity and fungal adhesion were investigated in this study. The low concentration (1 micromol l(-1)) of the liquid components caused no change in the activities and morphologies of the gingival fibroblast cells, compared with control and dimethylsulphoxide-exposed cells. However, when the cells were exposed to high concentrations (1 mmol l(-1)) of benzqyl peroxide, morphological change was observed, implying that the exposure of the cells to high concentrations of the liquid components of denture acrylic causes the loss of adhesion proteins from the cells. Thus the amount of Candida adhesion to human gingival cells was analysed, and the adherence of fungi to the cell was significantly reduced when the cells were pre-exposed to methyl methacrylate, hydroquinone and benzoyl peroxide at a concentration of 1 micromol l(-1) (P < 0.01), which did not affect either the cell viability or the cell morphology. These results, taken together, suggested that the renewal of dentures could be a possible therapeutic and/or preventive aid for oral candidosis in denture-wearing patients. PMID:12572719

Makihira, S; Nikawa, H; Nishimura, M; Egusa, H; Sadamori, S; Rahayu, R P; Nishimura, H; Hamada, T

2002-10-01

311

Developing the procedure of modifying the denture soft liner by silver nanoparticles.  

PubMed

Colonization of denture soft lining materials by fungi and denture plaque leads to infections of mucosa. Microorganisms such as Candida albicans colonize not only the surface of the soft liners, but they also penetrate inside those materials. Therefore the use of common disinfectants, e.g., surface active cleaners, is not a perfect solution for keeping a proper hygiene of soft linings. Modifying soft lining by silver nanoparticles (AgNP) seems to be a right way to overcome those problems. The procedure of modifying two-component silicone material by silver nanoparticles (AgNP) is presented in the article. The solubility tests for both material components have been carried out in the first stage of examinations. On the basis of test results, a solvent has been selected, being a dispersion medium for AgNPs and both soft liner components. The effective method for evaporating a solvent from the composition has been developed. Material components with various AgNP concentrations (10, 20, 40, 80, 120 and 200 ppm) have been obtained. Cured samples of the composites have been examined by SEM to confirm the effectiveness of the procedure. PMID:22742207

Chladek, Grzegorz; Barszczewska-Rybarek, Izabela; Lukaszczyk, Jan

2012-01-01

312

Biological effects of soft denture reline materials on L929 cells in vitro  

PubMed Central

Soft denture reline materials have been developed to help patients when their oral mucosa is damaged or affected due to ill-fitting dentures or post-implant surgery. Although reports have indicated that these materials leach monomers and other components that do affect their biocompatibility, there is little information on what cell molecules may be implicated in these material/tissue interactions. The biocompatibility of six soft liners (Ufi Gel P, Sofreliner S, Durabase Soft, Trusoft, Softone and Coe Comfort) was evaluated using a mouse fibroblast cell line, L929. Within 2 h of material disc preparation, each of the materials was exposed by direct contact to L929 cells for periods of 24 and 48 h. The effect of this interaction was assessed by alamarBlue assay (for cell survival). The expression of integrin ?5?1 and transforming growth factor ?1 was also assessed using plate assays such as enzyme-linked immunosorbent assay. Trusoft, Softone and Coe Comfort showed significantly reduced cell survival compared with the other soft lining materials at each incubation period. Furthermore, there were significant differences with these same materials in the expression of both integrin ?5?1 and transforming growth factor ?1. Soft liner materials may affect cell viability and cellular proteins that have important roles in wound healing and the preservation of cell viability and function in the presence of environmental challenges and stresses. PMID:25383166

Chaves, Carolina AL; Vergani, Carlos E; Thomas, Dominique; Young, Anne; Costa, Carlos AS; Machado, Ana L

2014-01-01

313

Conventional versus implant-retained overlay dentures: a pilot study of masseter and anterior temporalis electromyography.  

PubMed

Implant-supported overlay dentures (ISODs) have been widely accepted among patients using conventional removable complete dentures (CRCDs). The present study aimed to comparatively study conventional and ISODs in terms of function and coordination of masticatory muscles using electromyograms. Included were 10 patients with ISODs (each with 2 implants in the intercanine area). The mean wave range (MWR) and frequency (MWF) of masseter and temporalis were recorded with (ISOD) and without (CRCD) ball attachments while maximum clenching on cotton rolls (cotton roll clenching), maximum intercuspal clenching (clenching), and unilateral gum chewing (chewing) using electromyography. Data were analyzed in SPAW using t-paired for matched groups and independent-sample t tests for unmatched ones. The MWF differences were not statistically significant with or without attachments (P > .05). Without attachments in place, the MWF of both masseter and temporalis muscles significantly decreased when patients clenched on cotton rolls (P = .01 and .02, respectively) and when chewing unilaterally (both P = .01). With attachments present, the right and left temporalis muscles did not show identical mean wave ranges while chewing (P = .01). Without attachments, this disharmony was seen in the left and right masseter muscles (P = .03). The MWR of masseter was higher in men while chewing with attachments (P = .02). Without attachments, the MWR of temporalis was higher in women while cotton roll clenching (P = .03) and chewing (P = .02). These findings are seemingly in favor of improved masticatory function and coordination in edentulous patients with the application of ISODs. PMID:25106005

Dakhilalian, Mansour; Rismanchian, Mansour; Fazel, Akbar; Basiri, Keyvan; Azadeh, Hamid; Mahmoodi, Maryam; Fayazi, Sara; Sadr-Eshkvari, Pooyan

2014-08-01

314

Mastication improvement after partial implant-supported prosthesis use.  

PubMed

Partially edentulous patients may be rehabilitated by the placement of removable dental prostheses, implant-supported removable dental prostheses, or partial implant fixed dental prostheses. However, it is unclear the impact of each prosthesis type over the masticatory aspects, which represents the objective of this paired clinical trial. Twelve patients sequentially received and used each of these 3 prosthesis types for 2 months, after which maximum bite force was assessed by a strain sensor and food comminution index was determined with the sieving method. Masseter and temporal muscle thicknesses during rest and maximal clenching were also evaluated by ultrasonography. Each maxillary arch received a new complete denture that was used throughout the study. Data were analyzed by analysis of variance for repeated measures, followed by the Tukey test (p < .05). Maximum bite force and food comminution index increased (p < .0001) after implant-supported dental prosthesis and implant fixed dental prosthesis use, with the higher improvement found after the latter's use. Regardless of implant-retained prosthesis type, masseter muscle thickness during maximal clenching also increased (p < .05) after implant insertion. Partial implant-supported prostheses significantly improved masseter muscle thickness and mastication, and the magnitude of this effect was related to prosthesis type. PMID:24158344

Gonçalves, T M S V; Campos, C H; Gonçalves, G M; de Moraes, M; Rodrigues Garcia, R C M

2013-12-01

315

The effect of orthodontic appliances on the distribution of Candida and plaque in adolescents.  

PubMed

The site prevalence and intra-oral density of Candidal organisms may be increased by local factors including prostheses. However, whether significant changes in Candidal carriage occurs with denture wearing is not clearly established. This study employed the imprint culture technique to assess the effects of fixed and removable orthodontic appliances on oral carriage, site prevalence and intra-oral density of Candida in adolescents. Moreover, alterations in plaque distribution were measured. Groups of 12-16 year olds without or wearing fixed and removable appliances were studied. Imprint cultures were taken from six intra-oral sites and colony counts recorded after 48 hours incubation on selective media. Plaque scores were recorded from non-appliance and removable appliance wearers. The prevalence of Candidal carriage in the groups was not significantly different being 46 per cent of non-appliance, 51 per cent of fixed appliance and 52 per cent of removable appliance wearers. However, the prevalence of Candidal recovery at some sites and Candidal densities at all sites were significantly increased in both fixed and removable appliance wearers. Thus orthodontic appliances may predispose to Candidal proliferation in oral carriers. However, the results do not permit the conclusion that appliances may change non-carriers of Candida to carriers. Plaque distribution was significantly altered in removable appliance wearers when compared with non-appliance wearers as a result of increases in palatal plaque scores. These findings again emphasize the particular need for oral hygiene instruction in patients wearing appliances or partial prostheses. PMID:6954991

Addy, M; Shaw, W C; Hansford, P; Hopkins, M

1982-07-01

316

[Research related to pressures under dentures. The effect of differences in impression pressure with special reference to unilateral mandibular free-end edentulousness].  

PubMed

The purpose of this paper is to investigate the difference of impression pressure under denture bases made by the pressure impression-taking method, which considers the resiliency of ligaments under abutment teeth and mucosa under dentures, and under those made by the non-pressure impression-taking method, and then analyzed its influence on the distribution of pressure curve produced by bite force with the case of unilateral mandibular free-end edentulousness. The findings were as follows: 1. As for the pressures under the dentures, dentures made by the pressure impression-taking method in all cases showed an apparent increase at the mesial part, while at the distal part, a decrease was detected in three out of five patients. 2. The pressure curve caused by bite force tended to rise sharply immediately before the application of maximum bite force. 3. Ratio of pressures resulting from the increased bite force tended to increase with dentures using the non-pressure impression-taking method, while dentures using the pressure impression-taking method showed a clear tendency to equalize toward 0.5, regardless of the values of the bite force. PMID:2489732

Umetsu, N

1989-08-01

317

Effect of composition of experimental fluorinated soft lining materials on bond strength to denture base resin.  

PubMed

The purpose of the present study was to investigate the effect of the composition of experimental fluorinated soft lining materials on bond strength to denture base resin. Vinylidene fluoride/hexafluoro propylene copolymer (2-6F), tridecafluorooctyl methacrylate (13FMA), methoxy diethylene glycol methacrylate (MDGMA), and silica (as filler) were used for fabrication of the experimental soft lining materials. Nine experimental soft lining materials having various compositions of 2-6F, 13FMA, and MDGMA were prepared. Shear and tensile bond strength tests were performed before and after immersion in water. The water sorption for the materials was also measured. An increase in the content of acrylic monomer, MDGMA, in the experimental materials increased the bond strength before immersion in water but reduced the bond strength after immersion in water as compared to that before immersion in water. The inclusion of fluorinated monomer (13FMA) in the materials appeared to affect water sorption. PMID:25273041

Hoshino, Yoshihito; Nakajima, Hiroshi; Akiba, Norihisa; Hibino, Yasushi; Nagasawa, Yuko; Sumi, Yasunori; Minakuchi, Shunsuke

2014-01-01

318

New form of administering chlorhexidine for treatment of denture-induced stomatitis  

PubMed Central

Background: The purpose of this study was to evaluate the release of chlorhexidine as an antifungal drug from doped self-cured poly (methyl methacrylate) (PMMA) acrylic resin and the effect of the drug released on the growth of Candida albicans. Methods: Release of chlorhexidine was evaluated using liquid chromatography, and the effect of the drug on the growth of C. albicans was investigated microbiologically using a “well” technique on Saboraud culture medium inoculated with a resistant strain of C. albicans. Results: Chlorhexidine leached steadily out of the acrylic resin into distilled water at mouth temperature, and the sustained drug release continued throughout the 28-day test period. The drug released also demonstrated antifungal activity against the resistant strain of C. albicans. Conclusion: The findings of this study support the use of chlorhexidine-impregnated self-cured PMMA chair-side resin as a new dosage form for the treatment of denture-induced stomatitis. PMID:21753884

Ryalat, Soukaina; Darwish, Rula; Amin, Wala

2011-01-01

319

[Gingivo-dental sparing strategy of orthodontic treatment (fitting with permanent dentures)].  

PubMed

Development of inflammatory process in the marginal part of the mucosa is caused not only by epithelial injury during tooth preparation and dental plaque accumulation, but by irregular contour and position of the artificial crown edge as well. Clinical, x-ray, and cytoenzymological studies showed that orthodontic treatment with cermet and polyceramic dentures with fixation of the supporting elements at the level of the gingival edge in tissues adjacent to the tooth causes the slightest pathological changes. The compensatory adaptive processes in this area of the buccal mucosa are the most pronounced if preparation of hard dental tissues is combined with closed currettage of periodontal pouches, which was confirmed by remote clinical results and laboratory findings in patients with slight and medium-severe periodontitis. PMID:12931421

Bragin, E A

2003-01-01

320

Partial tooth gear bearings  

NASA Technical Reports Server (NTRS)

A partial gear bearing including an upper half, comprising peak partial teeth, and a lower, or bottom, half, comprising valley partial teeth. The upper half also has an integrated roller section between each of the peak partial teeth with a radius equal to the gear pitch radius of the radially outwardly extending peak partial teeth. Conversely, the lower half has an integrated roller section between each of the valley half teeth with a radius also equal to the gear pitch radius of the peak partial teeth. The valley partial teeth extend radially inwardly from its roller section. The peak and valley partial teeth are exactly out of phase with each other, as are the roller sections of the upper and lower halves. Essentially, the end roller bearing of the typical gear bearing has been integrated into the normal gear tooth pattern.

Vranish, John M. (Inventor)

2010-01-01

321

Mechanical and thermal properties of polyamide versus reinforced PMMA denture base materials  

PubMed Central

PURPOSE This in vitro study intended to investigate the mechanical and thermal characteristics of Valplast, and of polymethyl methacrylate denture base resin in which different esthetic fibers (E-glass, nylon 6 or nylon 6.6) were added. MATERIALS AND METHODS Five groups were formed: control (PMMA), PMMA-E glass, PMMA-nylon 6, PMMA-nylon 6.6 and Valplast resin. For the transverse strength test the specimens were prepared in accordance with ANSI/ADA specification No.12, and for the impact test ASTM D-256 standard were used. With the intent to evaluate the properties of transverse strength, the three-point bending (n=7) test instrument (Lloyd NK5, Lloyd Instruments Ltd, Fareham Hampshire, UK) was used at 5 mm/min. A Dynatup 9250 HV (Instron, UK) device was employed for the impact strength (n=7). All of the resin samples were tested by using thermo-mechanical analysis (Shimadzu TMA 50, Shimadzu, Japan). The data were analyzed by Kruskal-Wallis and Tukey tests for pairwise comparisons of the groups at the 0.05 level of significance. RESULTS In all mechanical tests, the highest values were observed in Valplast group (transverse strength: 117.22 ± 37.80 MPa, maximum deflection: 27.55 ± 1.48 mm, impact strength: 0.76 ± 0.03 kN). Upon examining the thermo-mechanical analysis data, it was seen that the E value of the control sample was 8.08 MPa, higher than that of the all other samples. CONCLUSION Although Valplast denture material has good mechanical strength, its elastic modulus is not high enough to meet the standard of PMMA materials. PMID:23755341

Bolayir, Giray; Boztug, Ali

2013-01-01

322

Conventional vs. implant retained overlay dentures: a clinical trial of masseter and anterior temporalis electromyography.  

PubMed

Abstract Background: Implant supported overlay dentures (ISODs) have been widely accepted among patients using conventional removable complete dentures (CRCDs). The present study aimed to comparatively study conventional and ISODs in terms of function and coordination of masticatory muscles using electromyograms.Materials and methods: Included were 10 patients with ISODs (each with 2 implants in the intercanine area). The mean wave range (MWR) and frequency (MWF) of masseter and temporalis were recorded with (ISOD) and without (CRCD) ball attachments while maximum clenching on cotton rolls (cotton roll clenching), maximum intercuspal clenching (clenching), and unilateral gum chewing (chewing) using electromyography. Data were analyzed in SPAW using t-paired for matched groups and independent sample t-tests for unmatched ones. Results: MWF differences were not statistically significant with or without attachments (p > 0.05). Without attachments in place, MWF of both masseter and temporalis muscles significantly decreased when patients clenched on cotton rolls (p = 0.01 and 0.02, respectively) and when chewing unilaterally (p = 0.01 both). With attachments present, the right and left temporalis muscles did not show identical mean wave ranges while chewing (p = 0.01). Without attachments, this disharmony was seen in the left and right masseter muscles (p = 0.03). MWR of masseter was higher in men while chewing with attachments (p = 0.02). Without attachments, MWR of temporalis was higher in women while cotton roll clenching (p = 0.03) and chewing (p = 0.02). Conclusion: These findings are seemingly in favor of improved masticatory function and coordination in edentulous patients with the application of ISODs. PMID:22506632

Dakhilalian, Mansoor; Rismanchian, Mansoor; Fazel, Akbar; Basiri, Keyvan; Azadeh, Hamid; Mahmoodi, Maryam; Fayazi, Sara; Sadr-Eshkvari, Pooyan

2012-04-16

323

Analysis of the posterior palatal seal and the palatal form as related to the retention of complete dentures.  

PubMed

Dislodging forces were applied at three different locations--anterior, posterior, middle--on acrylic resin bases of uniform thickness. The influence of different posterior palatal seals and the form of the palate were evaluated. A Pearson statistical correlation analysis was performed to correlate these factors. The findings were as follows: 1. The anterior attachment needed for greatest amount of force to dislodge the base; the posterior attachment needed the least. 2. The middle attachment showed more variability of the forces needed to dislodge the bases. It was influenced by the form of the palate, the type of posterior palatal seal, and the weight of the bases. 3. The middle location is the most reliable region for testing the retention of complete dentures. 4. The form of the palate has direct influence on the retention of complete dentures and will aid in the selection of the type of posterior palatal seal needed. PMID:7033511

Colón, A; Kotwal, K; Mangelsdorff, A D

1982-01-01

324

New phosphated poly(methyl methacrylate) polymers for the prevention of denture-induced microbial infection: an in vitro study  

PubMed Central

Purpose Poly(methyl methacrylate) (PMMA) has been widely used as a denture-base acrylic resin due to its excellent physical and mechanical properties. However, the material is highly prone to microbial fouling that often leads to Candida-associated denture stomatitis. Incorporation of phosphate groups into PMMA could facilitate adsorption of salivary antimicrobials and inhibit microbial adherence on the polymer surface. An in vitro study evaluated PMMA polymers containing varying amounts of phosphate group for their efficacy to inhibit Candida albicans adhesion, adsorb salivary histatin 5, and exhibit candidacidal activity. Methods Six PMMA polymers containing 0%, 5%, 15%, 10%, 20%, and 25% of phosphate group were synthesized by bead (suspension) polymerization technique using mixtures of methyl methacrylate and methallyl phosphate as monomers. The efficacy of the polymers to inhibit the adherence of C. albicans was examined by using human saliva-coated polymer beads and radio-labeled C. albicans cells, as compared with that of PMMA. The potency of the phosphated PMMA polymers to adsorb histatin 5 was determined by measuring the radioactivity of the adsorbed labeled-peptide on the polymer surface. The candidacidal activity of the histatin 5-adsorbed polymers was assessed by using the fluorescence technique. The percent release of the fluorescent probe calcein from the C. albicans membrane caused by the disruption of the cell membrane was determined. The data were analyzed statistically by one-way ANOVA followed by Scheffé’s test (? = 0.05 and n = 6). Results The presence of ?15% phosphate content in PMMA significantly reduced the saliva-mediated adhesion of C. albicans. Phosphated PMMA polymers showed significantly enhanced adsorption of histatin 5 in a phosphate density-dependent manner. The candidacidal activity of the histatin 5-bound polymers increased significantly with the increase in the phosphate content of the polymer. Conclusion Phosphated PMMA polymers have the potential to serve as novel denture-base resins, which may reduce C. albicans colonization and prevent denture stomatitis. PMID:23674911

Raj, Periathamby Antony; Dentino, Andrew R

2011-01-01

325

Changes in roughness of denture base and reline materials by chemical disinfection or microwave irradiation. Surface roughness of denture base and reline materials  

PubMed Central

Objective The effect of disinfection by immersion in sodium perborate solution and microwave irradiation on surface roughness of one denture base resin (Lucitone 550 -L), 3 hard chairside reline resins (Tokuyama Rebase II-TR, New Truliner-NT, Ufi Gel hard-UH) and 3 resilient reline materials (Trusoft-T; Sofreliner-S, Dentusil-D) was evaluated. Material and methods Thirty specimens of each material were made and divided into 3 groups: Control - not disinfected; P - daily disinfection by immersing in sodium perborate solution (3.8%); MW - microwave disinfection (6 min/650 W). Roughness measurements were made after polymerization (baseline) and after 1, 3 and 28 days. Roughness differences relative to the baseline readings were analyzed by Student's t-test (P=0.05). Results At baseline, Trusoft showed the highest (P<0.001) mean surface roughness (3.54 µm), and its surface roughness was significantly reduced after 28 days of disinfection by immersion in sodium perborate (P=0.013). Roughness measurements of material Trusoft were not performed after microwave disinfection due to the severe alterations on the surface. In the 3 groups evaluated, changes in roughness were significant for materials Ufi Gel hard (from 0.11 to 0.26 µm; P?0.041) and New Truliner (0.19 to 0.76 µm; P?0.019). The roughness of materials Lucitone 550 (0.37 µm), Tokuyama Rebase II (0.37 µm), Sofreliner (0.49 µm) and Dentusil (0.38 µm) remained unaffected (P>0.05). Conclusions The roughness of the hard reline materials Ufi Gel hard and New Truliner was adversely affected by microwave disinfection, immersion in water or in sodium perborate. Microwave disinfection caused severe alterations on the surface of the resilient liner Trusoft. PMID:21986658

MACHADO, Ana Lucia; GIAMPAOLO, Eunice Teresinha; VERGANI, Carlos Eduardo; de SOUZA, Juliana Feltrin; JORGE, Janaina Habib

2011-01-01

326

Reinforcing effects of different fibers on denture base resin based on the fiber type, concentration, and combination.  

PubMed

The aim of this study was to evaluate the reinforcing effects of three types of fibers at various concentrations and in different combinations on flexural properties of denture base resin. Glass (GL), polyaromatic polyamide (PA) and ultra-high molecular weight polyethylene (PE) fibers were added to heat-polymerized denture base resin with volume concentrations of 2.6%, 5.3%, and 7.9%, respectively. In addition, hybrid fiber-reinforced composite (FRC) combined with either two or three types of fibers were fabricated. The flexural strength, modulus and toughness of each group were measured with a universal testing machine at a crosshead speed of 5 mm/min. In the single fiber-reinforced composite groups, the 5.3% GL and 7.9% GL had the highest flexural strength and modulus; 5.3% PE was had the highest toughness. Hybrid FRC such as GL/PE, which showed the highest toughness and the flexural strength, was considered to be useful in preventing denture fractures clinically. PMID:23207213

Yu, Sang-Hui; Lee, Yoon; Oh, Seunghan; Cho, Hye-Won; Oda, Yutaka; Bae, Ji-Myung

2012-01-01

327

Live broadcast lectures on complete denture prosthodontics at Tokyo Medical and Dental University: comparison of two years.  

PubMed

A live broadcasting system was developed as part of dental education with Information and Communication Technology (ICT) at Tokyo Medical and Dental University. The purpose of this study was to utilize this system in complete denture prosthodontics, especially for the procedure of making a definitive impression with custom tray border molding in edentulous patients, and to evaluate its effectiveness. Live broadcast lectures on complete denture prosthodontics were given to fourth-year students in 2009 (fifty-nine students) and in 2010 (sixty-five students). To evaluate this lecture, a questionnaire was distributed to the students and faculty members after the lecture. Almost all the students and faculty members rated the lecture as good. Students commented that the lecture was "intelligible," "inspiring," "improved understanding," "good because they could ask questions in real time," "helped to know the actual time," "good for all the students to see the same case," and "close to real experience and induced a sense of tension." The results of this study suggested that a live broadcast lecture would help students experience the real clinical situation and aid in teaching complete denture prosthodontics. PMID:23486896

Iwaki, Maiko; Kanazawa, Manabu; Sunaga, Masayo; Kinoshita, Atsuhiro; Minakuchi, Shunsuke

2013-03-01

328

Effectiveness of Different Cleaning Agents against the Colonization of Candida spp and the in Vitro Detection of the Adherence of These Yeast Cells to Denture Acrylic Surfaces  

PubMed Central

Purpose The aim of this study is to examine the effect Klorhex and Fittydent, which are used as cleaning agents on the adhesion of Candida on the surfaces of acrylic denture and palatal mucosa. In addition, ability of yeasts to adhere to acrylic strips was evaluated after applying these agents in vitro. Materials and Methods Each group of 15 patients cleaned their dentures with either Klorhex or with Fittydent. The control group cleaned their dentures with water. Results It was found that 62.2% of the patients had colonies of Candida species on their palatal mucosa which was reduced to 51.1% after using these cleaning agents. The colonization rate with Candida spp on their dentures was reduces from 82.2% to 68.8% using these cleaning agents. The mean adhesion value of the Candida strains isolated from the acrylic strips were found to be 75 cell/strip prior to applying the Klorhex and Fittydent and 37.5 cell/strip and 15 cell/strip after applying these agents, respectively. Conclusion These results showed that Klorhex and Fittydent have a certain preventive effect on the colonization rate of Candida spp on the surface of these dentures, the palatal mucosa, as well as on the acrylic strips in vitro. PMID:18729309

Kalkanci, Ayse; Filiz, Banu; Kustimur, Semra

2008-01-01

329

Partial Derivative Visualization Gallery  

NSDL National Science Digital Library

This resource is a small gallery of demos for illustrating partial derivatives geometrically. These animations can be used by instructors in a classroom setting or by students to aid in acquiring a visualization background for partial derivatives. Two file formats, gif and QuickTime files are used for the animations which can be downloaded.

Roberts, Lila F.; Hill, David R.

2004-11-11

330

Cross-arch arrangement in complete denture prosthesis to manage an edentulous patient with oral submucous fibrosis and abnormal jaw relation.  

PubMed

A patient with oral submucous fibrosis and resorbed ridges poses a challenge for prosthodontic rehabilitation because of the limited mouth opening and fibrotic mucosa. The fabrication of prosthesis is very difficult due to abnormal jaw relations, influencing the long-term prognosis of the patient. To present a case of oral submucous fibrosis with severely resorbed edentulous ridges which was successfully managed by adopting a modified technique in fabricating a complete denture prosthesis. A 55-year-old female patient with completely edentulous maxillary and mandibular arches diagnosed with oral submucous fibrosis was rehabilitated with complete dentures by recording neutral zone for resorbed mandibular ridge and by arranging the posterior teeth in cross arch relation for compensation of the abnormal jaw relations. The cross-arch arrangement of posterior teeth provides a more stable and retentive complete denture prosthesis for patients with severely resorbed ridges and a wider mandibular arch. PMID:25239981

Tambe, Abhijit; Patil, Sanjayagouda B; Bhat, Sudhakara; Badadare, Mokshada M

2014-01-01

331

Impact strength of denture base and reline acrylic resins: An in vitro study  

PubMed Central

This study evaluated the impact strength of a denture base resin (Lucitone 550—L) and four reline resins (Tokuyama Rebase II—T; Ufi Gel Hard—U; New Truliner—NT, and Kooliner—K), both intact and in a reline combination (L/L, L/T, L/U, L/NT, and L/K). For each group (n = 20), half of the specimens were thermocycled before testing. Charpy tests were performed, and the impact strengths were calculated. Data were analyzed by two-way analyses of variance and Tukey’s test (p = 0.05). For the intact groups, mean impact strength values for L (1.65 and 1.50) were significantly higher than those of the reline resins (0.38–1.17). For the relined groups, the highest mean impact strength values were produced by L/T (5.76 and 5.12), L/NT (6.20 and 6.03), and L/K (5.60 and 5.31) and the lowest by L/U (0.76 and 0.78). There were no significant differences between L and L/L. Thermocycling reduced the impact strength of T (from 0.73 to 0.38) and L/L (from 1.82 to 1.56). PMID:22977461

Bochio, Bruna C; Wady, Amanda F; Jorge, Janaina H; Canevarolo, Sebastiao V; Vergani, Carlos E

2012-01-01

332

Silver colloidal nanoparticle stability: influence on Candida biofilms formed on denture acrylic.  

PubMed

Our aim in this study was to evaluate how the chemical stability of silver nanoparticles (SNs) influences their efficacy against Candida albicans and C. glabrata biofilms. Several parameters of SN stability were tested, namely, temperature (50ºC, 70ºC, and 100ºC), pH (5.0 and 9.0), and time of contact (5 h and 24 h) with biofilms. The control was defined as SNs without temperature treatment, pH 7, and 24 h of contact. These colloidal suspensions at 54 mg/L were used to treat mature Candida biofilms (48 h) formed on acrylic. Their efficacy was determined by total biomass and colony-forming unit quantification. Data were analyzed using analysis of variance and the Bonferroni post hoc test (? = 0.05). The temperature and pH variations of SNs did not affect their efficacy against the viable cells of Candida biofilms (P > 0.05). Moreover, the treatment periods were not decisive in terms of the susceptibility of Candida biofilms to SNs. These findings provide an important advantage of SNs that may be useful in the treatment of Candida-associated denture stomatitis. PMID:24951722

Monteiro, Douglas Roberto; Takamiya, Aline Satie; Feresin, Leonardo Perina; Gorup, Luiz Fernando; de Camargo, Emerson Rodrigues; Delbem, Alberto Carlos Botazzo; Henriques, Mariana; Barbosa, Debora Barros

2014-08-01

333

Colour change of soft denture liners after storage in coffee and coke.  

PubMed

This study was to evaluate the colour change of soft denture liners after thermocycling and storage in coffee and coke. Four liners, two silicone-based (Sofreliner S and Reline GS) and two acrylic resin-based (Soft Confort and Dentuflex), were evaluated in this study. Ten samples were obtained for each group. After 2000 cycles of thermocycling with baths of 5°C and 55°C, five samples were stored in coffee and the remaining samples in coke. The colour alteration was evaluated in a reflection spectrophotometer before and after thermocycling, and after 1, 3, 24, 48 and 96h of storage in coffee and coke. Data were submitted to anova and Tukey's HSD test (?=0.05). Thermocycling and storage period represented a higher statistically significant influence for the resin liners than for the silicone materials. Coke did not influence the colour stability of the materials during storage. However, the coffee solution generated statistically significant colour alteration in the material Soft Confort. In the comparison between the coffee and coke solutions, there was no statistically significant difference for colour alteration only for the material Dentuflex. The silicone liners presented better colour stability following thermocycling and storage independent of the solution. The coffee solution was a statistically significant factor for colour alteration of the material Soft Confort. PMID:20082643

Goiato, Marcelo Coelho; Zuccolotti, Bruna Carolina Rossatti; Moreno, Amália; dos Santos, Daniela Micheline; Pesqueira, Aldiéris Alves; Dekon, Stefan Fiuza de Carvalho

2011-06-01

334

The Partial Derivative Machine  

NSDL National Science Digital Library

Research has shown that students struggle to understand the use of partial derivatives in thermodynamics. We have designed an apparatus, which we have called a Partial Derivative Machine, that serves as a mechanical analogue of a thermodynamic system. Using this device, students have a tangible way to wrestle with issues related to partial derivatives and thermodynamics, such as which variables are held fixed, how many variables are independent, and how energy can be added to a system. In this paper, we present a description of the apparatus, an introduction to the associated activities, and an overview of how this apparatus can be connected to thermodynamic systems.

Sherer, Grant; Kustusch, Mary B.; Manogue, Corinne A.; Roundy, David J.

2014-01-31

335

Recurrent partial priapism.  

PubMed

Exploration of an unusual case of a painful, recurrent, perineal mass revealed partial priapism of the right corpora cavernosa. Etiology is speculative and no definitive therapy is offered. PMID:1274013

Gottesman, J E

1976-05-01

336

Partial Testing Design  

Cancer.gov

Statistical Software Partial Testing Design (Written by Stuart G. Baker) New Approach (with ROC curves): See Baker SG, Pinsky P. A proposed design and analysis for comparing digital and analog mammography: special ROC methods for cancer screening. JASA.

337

Partial Derivatives: Geometric Visualization  

NSDL National Science Digital Library

This write-pair-share activity presents Calculus III students with a worksheet containing several exercises that require them to find partial derivatives of functions of two variables. Afterwards, a series of Web-based animations are used to illustrate the surface of each function, the path of the indicated partial derivative for a specified value of the variable and the value of the derivative at each point along the path.

Rutledge, James

338

Peel bond strength of resilient liner modified by the addition of antimicrobial agents to denture base acrylic resin  

PubMed Central

In order to prolong the clinical longevity of resilient denture relining materials and reduce plaque accumulation, incorporation of antimicrobial agents into these materials has been proposed. However, this addition may affect their properties. Objective This study evaluated the effect of the addition of antimicrobial agents into one soft liner (Soft Confort, Dencril) on its peel bond strength to one denture base (QC 20, Dentsply). Material and Methods Acrylic specimens (n=9) were made (75x10x3 mm) and stored in distilled water at 37ºC for 48 h. The drug powder concentrations (nystatin 500,000U - G2; nystatin 1,000,000U - G3; miconazole 125 mg - G4; miconazole 250 mg - G5; ketoconazole 100 mg - G6; ketoconazole 200 mg - G7; chlorhexidine diacetate 5% - G8; and 10% chlorhexidine diacetate - G9) were blended with the soft liner powder before the addition of the soft liner liquid. A group (G1) without any drug incorporation was used as control. Specimens (n=9) (75x10x6 mm) were plasticized according to the manufacturers' instructions and stored in distilled water at 37ºC for 24 h. Relined specimens were then submitted to a 180-degree peel test at a crosshead speed of 10 mm/min. Data (MPa) were analyzed by analysis of variance (?=0.05) and the failure modes were visually classified. Results No significant difference was found among experimental groups (p=0.148). Cohesive failure located within the resilient material was predominantly observed in all tested groups. Conclusions Peel bond strength between the denture base and the modified soft liner was not affected by the addition of antimicrobial agents. PMID:23329241

ALCANTARA, Cristiane S.; de MACEDO, Allana F.C.; GURGEL, Bruno C.V.; JORGE, Janaina H.; NEPPELENBROEK, Karin H.; URBAN, Vanessa M.

2012-01-01

339

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

340

Methanol partial oxidation reformer  

DOEpatents

A partial oxidation reformer is described comprising a longitudinally extending chamber having a methanol, water and an air inlet and an outlet. An igniter mechanism is near the inlets for igniting a mixture of methanol and air, while a partial oxidation catalyst in the chamber is spaced from the inlets and converts methanol and oxygen to carbon dioxide and hydrogen. Controlling the oxygen to methanol mole ratio provides continuous slightly exothermic partial oxidation reactions of methanol and air producing hydrogen gas. The liquid is preferably injected in droplets having diameters less than 100 micrometers. The reformer is useful in a propulsion system for a vehicle which supplies a hydrogen-containing gas to the negative electrode of a fuel cell. 7 figs.

Ahmed, S.; Kumar, R.; Krumpelt, M.

1999-08-17

341

Oxygen partial pressure sensor  

DOEpatents

A method for detecting oxygen partial pressure and an oxygen partial pressure sensor are provided. The method for measuring oxygen partial pressure includes contacting oxygen to a solid oxide electrolyte and measuring the subsequent change in electrical conductivity of the solid oxide electrolyte. A solid oxide electrolyte is utilized that contacts both a porous electrode and a nonporous electrode. The electrical conductivity of the solid oxide electrolyte is affected when oxygen from an exhaust stream permeates through the porous electrode to establish an equilibrium of oxygen anions in the electrolyte, thereby displacing electrons throughout the electrolyte to form an electron gradient. By adapting the two electrodes to sense a voltage potential between them, the change in electrolyte conductivity due to oxygen presence can be measured. 1 fig.

Dees, D.W.

1994-09-06

342

Effect of packing types on the dimensional accuracy of denture base resin cured by the conventional cycle in relation to post-pressing times  

Microsoft Academic Search

This study investigated the dimensional stability of denture bases influenced by packing methods, in relation to post-pressing times, in the Clássico acrylic resin which was prepared according to manufacturer recommendations. Forty maxillary wax bases were made and randomly assigned into 2 groups of 20 specimens each according to the conventional and RS system packing methods. In each method, the specimens

Rafael Leonardo; Xediek CONSANI; Saide Sarckis DOMITTI; Marcelo Ferraz MESQUITA

2004-01-01

343

Fluoride release and recharge characteristics of denture base resins containing surface pre-reacted glass-ionomer filler.  

PubMed

The flexural strength, flexural modulus, and the amount of fluoride released from four experimental denture base resins containing 5, 10, 20 and 30 wt% surface pre-reacted glass-ionomer (S-PRG) filler added to the powder were evaluated. The mean flexural strength of the experimental resins, except the 30 wt%, and the flexural modulus of all the resins, complied with ISO 1567 requirements. In the 20 wt% resin, the amount of fluoride released in the initial phase was 1.88 microg/cm2/day, after which the level decreased. After recharging in a 9000 ppm fluoride solution for eight hours, the level of released fluoride increased markedly to 40.21 microg/cm2/16 hrs. Our results show that fluoride levels increased as a function of the S-PRG filler content. After the almost completely discharged resins were recharged, similar fluoride release occurred again. These results suggest that denture base resins containing S-PRG filler have great recharge and release capabilities which may assist in preventing root caries of abutment teeth. PMID:19496404

Kamijo, Kazuko; Mukai, Yoshiharu; Tominaga, Takatoshi; Iwaya, Izumi; Fujino, Fukue; Hirata, Yukio; Teranaka, Toshio

2009-03-01

344

[Fundamental studies on bearing stress of basal seat under denture. 1. Difference height of ridge and load].  

PubMed

The purpose of this report is to investigate influence of difference in shape of ridge (height) and load (point, direction and strength) on bearing stress of basal seat. The stress against various loads (200-2,000 gf) onto artificial tooth (maxillaly first molar) were measured by using dentures, buried stress sensor, upon simulations of maxillaly edentulous posterior ridges with three types in height (9-15 mm). The summary of results are shown below: 1. When vertical loads onto mesial pit were applied, stress in working was most at ridge. The stronger load was, the more increased stress, and the shorter height of ridge was, the more decreased stress. Stress in balancing was most at palate. The stronger load was and the shorter height was, the more increased stress. 2. When oblique loads onto buccal cusp were applied 30 degrees to vertical, stress in working was most at palate. The stronger loads was, the more increased stress. In balancing, the stronger load was and the shorter height was, the more happened negative atmospheric pressure and breakaway of denture. 3. When oblique loads onto lingual cusp were applied 30 degrees to vertical, stress were most at buccal in working and at palate in balancing. At both areas, the stronger load was and the shorter height was, the more increased stress. PMID:2489692

Fujimori, K

1989-02-01

345

A Multidisciplinary Approach to Full Mouth Rehabilitation and Solving the Dilemma of Wriggling Dentures- A Case Report  

PubMed Central

A successful management of full mouth rehabilitation demands a multi-disciplinary approach for its long lasting success. The present case report is intended to give an insight into the use of multiple treatment modalities to achieve a balanced, efficient and biomechanically successful prosthodontic treatment with acceptable aesthetics. Treatment of a maxillary and mandibular bilateral distal free end edentulous arch along with upper and lower anterior teeth requires plenty of contemporary and conventional prosthodontic treatment modalities. Management of distal extension situation provides complexity of biomechanical problems due to the three dimensional movements of the distal extension denture. A distal most implant can convert a distal extension RPD from a tooth and tissue supported prosthesis to a tooth and implant supported prosthesis which provides a definite stop thus enhancing the retention and stability of the prosthesis, eliminating the problems often associated with a tooth and tissue supported distal extension RPD. How to cite the article: Nidawani P, Galagali G, Reddy ES, Behera SS. A Multidisciplinary Approach to Full Mouth Rehabilitation and Solving the Dilemma of Wriggling Dentures- A Case Report. J Int Oral Health 2014;6(2):136-40. PMID:24876716

Nidawani, Prakash; Galagali, Girish; Reddy, E Srinivas; Behera, Sidhartha S P

2014-01-01

346

Laparoscopic retroperitoneal partial nephrectomy.  

PubMed

To our knowledge we report the initial case of laparoscopic partial nephrectomy performed completely via the retroperitoneal approach. The retroperitoneal space was developed by inflating a balloon. Renal parenchymal hemostasis was obtained by a newly designed double loop apparatus and the argon beam coagulator. Convalescence was rapid and no complications have been noted during a followup of 7 months. PMID:7933195

Gill, I S; Delworth, M G; Munch, L C

1994-11-01

347

Generalized Partial Directed Coherence  

Microsoft Academic Search

This paper re-examines the definition of partial directed coherence (PDC) which was recently introduced as a linear frequency-domain quantifier of the multivariate relationship between simultaneously observed time series for application in functional connectivity inference in neuroscience. The present reappraisal aims at improving PDC's performance under scenarios that involve severely unbalanced predictive modelling errors (innovations noise). The present modification turns out

L. A. Baccald; F. de Medicina

2007-01-01

348

Partial gravity habitat study  

NASA Technical Reports Server (NTRS)

The purpose of this study is to investigate comprehensive design requirements associated with designing habitats for humans in a partial gravity environment, then to apply them to a lunar base design. Other potential sites for application include planetary surfaces such as Mars, variable-gravity research facilities, and a rotating spacecraft. Design requirements for partial gravity environments include locomotion changes in less than normal earth gravity; facility design issues, such as interior configuration, module diameter, and geometry; and volumetric requirements based on the previous as well as psychological issues involved in prolonged isolation. For application to a lunar base, it is necessary to study the exterior architecture and configuration to insure optimum circulation patterns while providing dual egress; radiation protection issues are addressed to provide a safe and healthy environment for the crew; and finally, the overall site is studied to locate all associated facilities in context with the habitat. Mission planning is not the purpose of this study; therefore, a Lockheed scenario is used as an outline for the lunar base application, which is then modified to meet the project needs. The goal of this report is to formulate facts on human reactions to partial gravity environments, derive design requirements based on these facts, and apply the requirements to a partial gravity situation which, for this study, was a lunar base.

Capps, Stephen; Lorandos, Jason; Akhidime, Eval; Bunch, Michael; Lund, Denise; Moore, Nathan; Murakawa, Kiosuke

1989-01-01

349

Partial and Total Differentiation  

Microsoft Academic Search

\\u000a The notion of derivative of a function of one-variable does not really have a solitary analogue for functions of several variables.\\u000a Indeed, for a function of two (or more) variables, there is a plethora of derivatives depending on whether we choose to become\\u000a partial to one of the variables, or opt to move about in a specific direction, or prefer

Sudhir R. Ghorpade; Balmohan V. Limaye

350

Partially Reflected Diffusion  

E-print Network

The radiation (reaction, Robin) boundary condition for the continuum diffusion equation is widely used in chemical and biological applications to express reactive boundaries. The underlying trajectories of the diffusing particles are believed to be partially absorbed and partially reflected at the reactive boundary, however, the relation between the reaction (radiation) constant in the Robin boundary condition and the reflection probability is still unclear. In this paper we clarify the issue by finding the relation between the reaction (radiation) constant and the absorption probability of the diffusing trajectories at the boundary. We analyze the Euler scheme for the underlying It\\^o dynamics, which is assumed to have variable drift and diffusion tensor, with partial reflection at the boundary. Trajectories that cross the boundary are terminated with a given probability and otherwise are reflected in a normal or oblique direction. We use boundary layer analysis of the corresponding Wiener path integral to resolve the non-uniform convergence of the probability density function of the numerical scheme to the solution of the Fokker-Planck equation with the Robin boundary condition, as the time step is decreased. We show that the Robin boundary condition is recovered in the limit iff trajectories are reflected in the co-normal direction. We find the relation of the reactive constant to the termination probability. We show the effect of using the new relation in numerical simulations.

A. Singer; Z. Schuss; D. Holcman

2006-06-19

351

Comparative Evaluation of Tensile Bond Strength between Silicon Soft Liners and Processed Denture Base Resin Conditioned by Three Modes of Surface Treatment: An Invitro Study.  

PubMed

Soft denture liners act as a cushion for the denture bearing mucosa through even distribution of functional load, avoiding local stress concentrations and improving retention of dentures there by providing comfort to the patient. The objective of the present study was to compare and evaluate the tensile bond strengths of silicone-based soft lining materials (Ufi Gel P and GC Reline soft) with different surface pre treatments of heat cure PMMA denture base acrylic resin. Stainless steel dies measuring 40 mm in length; 10 mm in width and 10 mm in height (40 × 10 × 10) were machined to prepare standardized for the polymethyl methacrylate resin blocks. Stainless steel dies (spacer for resilient liner) measuring 3 mm thick; 10 mm long and 10 mm wide were prepared as spacers to ensure uniformity of the soft liner being tested. Two types of Addition silicone-based soft lining materials (room temperature polymerised soft lining materials (RTPSLM): Ufi Gel P and GC Reline soft) were selected. Ufi Gel P (VOCO, Germany), GC Reline soft (GC America) are resilient, chairside vinyl polysiloxane denture reliners of two different manufacturers. A total of 80 test samples were prepared of which 40 specimens were prepared for Group A (Ufi Gel P) and 40 specimens for Group B (GC Reline soft). In these groups, based on Pre-treatment of acrylic resin specimens each group was subdivided into four sub groups of 10 samples each. Sub-group I-without any surface treatment. Sub-group II-sand blasted Sub-group III-treated with Methyl Methacrylate monomer Sub-group IV-treated with chemical etchant Acetone. The results were statistically analysed by Kruscal Wallis test, Mann-Whitney U test, and Independent t test. The specimens treated with MMA monomer wetting showed superior and significant bond strength than those obtained by other surface treatments. The samples belonging to subgroups of GC Reline soft exhibit superior tensile bond strength than subgroups of Ufi Gel P. The modes of failure of all specimens were mostly adhesive in nature. Surface pre treatments by chemical means improved the bond strength between the silicone liners and denture base. PMID:24431747

Surapaneni, Hemchand; Ariga, Padma; Haribabu, R; Ravi Shankar, Y; Kumar, V H C; Attili, Sirisha

2013-09-01

352

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

353

[Posterior glass fiber-reinforced composite resin-bonded fixed partial dentures: A 3-dimensional modeling and finite element numerical analysis].  

PubMed

The method of modeling and mesh generation about 3-unit tooth/restoration complex were established. The three-dimensional finite element models were subjected to four types of occlusal load applied to pontic element to evaluate 3 fiber framework designs and 3 cavities preparation configurations. By comparing the difference of stress distribution, following conclusions were obtained: the principal stress under buccal-lingual cusp load in traditional fiber framework pontic increased by 6.22% compared to that in pure composite resin pontic; optimized fiber framework obviously reduced stress level under any load; modified cavities exhibited better stress transfer and decreased share stress at adhesive interface than traditional cavities. PMID:17002101

Han, Jingyun; Fei, Renyuan; Li, Yansheng; Zhang, Lei

2006-08-01

354

A Prescription for Partial Synchrony  

E-print Network

Algorithms in message-passing distributed systems often require partial synchrony to tolerate crash failures. Informally, partial synchrony refers to systems where timing bounds on communication and computation may exist, but the knowledge...

Sastry, Srikanth

2012-07-16

355

Partial Evaluation Using Dependence Graphs  

Microsoft Academic Search

This thesis describes the use of program dependence graphs, as opposed to control flow graphs, as the basis for the partial evaluation of imperative programs. Partial evaluation is a program specialization operation in which programs with multiple inputs are specialized to take into account known values for some of their inputs. Thus, the result of partially evaluating a program given

Manuvir Das

1998-01-01

356

Free alg's via partial alg's  

E-print Network

Free alg's via functor on partial alg's Dion Coumans and Sam van Gool Free algebra step-by-step Free image-total functor Application to KB Free algebras via a functor on partial algebras Dion Coumans / 16 #12;Free alg's via functor on partial alg's Dion Coumans and Sam van Gool Free algebra step

van Suijlekom, Walter

357

The effect of numbers and locations of retentive holes placed on master casts on reducing the polymerization distortion of the maxillary complete denture.  

PubMed

Polymerization shrinkage is one of the disadvantages ofpolymethyl methacrylate resulting in distortion of resin denture bases. The aim of this study is to analyze the effect of numbers and locations of retentive holes on reducing polymerization distortion. Forty eight master casts were assigned as: control group (A); one anchoring hole (B); three anchoring holes (C); five anchoring holes (D).The gap distances between the denture bases and casts were measured. The data were analyzed with one-way analysis of variance (ANOVA) followed by the Post-Hoc LSD test. Mechanical anchorage reduced the gap distances in lateral and mid-palate significantly; and this decrease was affected by numbers and locations of anchoring holes significantly. PMID:24261106

Golshah, M; Monfared, M S; Najafi-Abrandabadi, S

2013-09-01

358

Partial LLL Reduction  

E-print Network

The Lenstra-Lenstra-Lovasz (LLL) reduction has wide applications in digital communications. It can greatly improve the speed of the sphere decoding (SD) algorithms for solving an integer least squares (ILS) problem and the performance of the Babai integer point, a suboptimal solution to the ILS problem. Recently Ling and Howgrave-Graham proposed the so-called effective LLL (ELLL) reduction. It has less computational complexity than LLL, while it has the same effect on the performance of the Babai integer point as LLL. In this paper we propose a partial LLL (PLLL) reduction. PLLL avoids the numerical stability problem with ELLL, which may result in very poor performance of the Babai integer point. Furthermore, numerical simulations indicated that it is faster than ELLL. We also show that in theory PLLL and ELLL have the same effect on the search speed of a typical SD algorithm as LLL.

Xie, Xiaohu; Borno, Mazen Al

2012-01-01

359

Partial oxidation catalyst  

DOEpatents

A two-part catalyst comprising a dehydrogenation portion and an oxide-ion conducting portion. The dehydrogenation portion is a group VIII metal and the oxide-ion conducting portion is selected from a ceramic oxide crystallizing in the fluorite or perovskite structure. There is also disclosed a method of forming a hydrogen rich gas from a source of hydrocarbon fuel in which the hydrocarbon fuel contacts a two-part catalyst comprising a dehydrogenation portion and an oxide-ion conducting portion at a temperature not less than about 400.degree. C. for a time sufficient to generate the hydrogen rich gas while maintaining CO content less than about 5 volume percent. There is also disclosed a method of forming partially oxidized hydrocarbons from ethanes in which ethane gas contacts a two-part catalyst comprising a dehydrogenation portion and an oxide-ion conducting portion for a time and at a temperature sufficient to form an oxide.

Krumpelt, Michael (Naperville, IL); Ahmed, Shabbir (Bolingbrook, IL); Kumar, Romesh (Naperville, IL); Doshi, Rajiv (Downers Grove, IL)

2000-01-01

360

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

361

Influence of dentures on SAR in the visible Chinese human head voxel phantom exposed to a mobile phone at 900 and 1800 MHz.  

PubMed

To investigate the influence of dentures on electromagnetic energy absorption during the daily use of a mobile phone, a high-resolution head phantom based on the Visible Chinese Human dataset was reconstructed. Simulations on phantoms with various dentures were performed by using the finite-difference time-domain method with a 0.47 wavelength dipole antenna and a mobile phone model as radiation sources at 900 and 1800 MHz. The Specific energy Absorption Rate (SAR) values including 1 and 10 g average SAR values were assessed. When the metallic dental crowns with resonance lengths of approximately one-third to one-half wavelength in the tissue nearby are parallel to the radiation source, up to 121.6% relative enhancement for 1 g average SAR and 17.1% relative enhancement for 10 g average SAR are observed due to the resonance effect in energy absorption. When the radiation sources operate in the normal configuration, the 10 g average SAR values are still in compliance with the basic restrictions established by the Institute of Electrical and Electronic Engineers (IEEE) and the International Commission on Non-Ionizing Radiation Protection (ICNIRP), indicating that the safety limits will not be challenged by the usage of dentures. PMID:22388567

Yu, Dong; Zhang, Ruoyu; Liu, Qian

2012-09-01

362

Experts' understanding of partial derivatives using the Partial Derivative Machine  

E-print Network

Partial derivatives are used in a variety of different ways within physics. Most notably, thermodynamics uses partial derivatives in ways that students often find confusing. As part of a collaboration with mathematics faculty, we are at the beginning of a study of the teaching of partial derivatives, a goal of better aligning the teaching of multivariable calculus with the needs of students in STEM disciplines. As a part of this project, we have performed a pilot study of expert understanding of partial derivatives across three disciplines: physics, engineering and mathematics. Our interviews made use of the Partial Derivative Machine (PDM), which is a mechanical system featuring four observable and controllable properties, of which any two are independent. Using the PDM, we probed expert understanding of partial derivatives in an experimental context in which there is not a known functional form. Through these three interviews, we found that the mathematicians exhibited a striking difference in their underst...

Roundy, David; Dray, Tevian; Manogue, Corinne A; Weber, Eric

2014-01-01

363

Accelerated partial breast irradiation.  

PubMed

Local therapies to treat newly diagnosed breast cancer include a lumpectomy with radiation therapy or a mastectomy. The 20-year data from studies about the safety and efficacy of lumpectomy with full-breast radiation therapy support the safety of this regimen and its role to decrease the risk of ipsilateral recurrence and increase long-term survivorship of women with breast cancer. Accelerated partial breast irradiation (APBI) provides radiation therapy to the tumor bed but spares the remaining breast tissue. APBI accelerates the time required to complete the therapy regimen, with a range of one intraoperative session to five consecutive days compared to five to seven weeks. Several techniques exist to administer APBI, including the insertion of a balloon into the lumpectomy space. Of interest is the widespread use of APBI in community and academic settings that has preceded outcomes of large, randomized clinical trials. Because of selection bias in a number of small, single-institution, nonrandomized studies, published data are of limited value to ensure APBI as a standard of care. PMID:25253109

Bauer, Elfrida; Lester, Joanne L

2014-10-01

364

Partial oxidation process  

SciTech Connect

A continuous process for preventing the build-up of metals from the hydrocarbonaceous fuel feed in a partial oxidation system in which about 80-100 wt. % of the carbon-soot produced is recycled to the gas generator. By the subject process a significantly large portion of the metals and metal compounds i.e. ash in the soot-water feed stream to the decanter become concentrated in the grey water that separates out in the decanter in the carbon recovery section. The concentration of ash suspended in the grey water may be then easily reduced in a solids-liquid separator with or without the addition of a flocculant and prior to recycling a portion of the grey water to the gas quench tank and/or gas scrubber. Further, the ash suspended in the carbon-soot-liquid hydrocarbonaceous fuel stream from the bottom of the liquid organic extractant still may be optionally reduced in another solids-liquid separator prior to recycling a portion of said stream to the gas generator as part of the hydrocarbonaceous reactant fuel feed.

Dille, R.M.; Estabrook, L.E.; Rhodes, H.A.; Richter, G.N.; Rohner, J.G.P.

1984-08-21

365

Trigonometric Integrals via Partial Fractions  

ERIC Educational Resources Information Center

Parametric differentiation is used to derive the partial fractions decompositions of certain rational functions. Those decompositions enable us to integrate some new combinations of trigonometric functions.

Chen, H.; Fulford, M.

2005-01-01

366

Effect of Beverages on the Hardness and Tensile Bond Strength of Temporary Acrylic Soft Liners to Acrylic Resin Denture Base  

PubMed Central

Statement of Problem: Two potential problems commonly identified with a denture base incorporating a resilient liner are failure of the bond between acrylic resin and soft liner material, and loss of resiliency of the soft liner over time. Since patients may drink different beverages, it is important to evaluate their effects on physical properties of soft lining materials. Purpose: The objective of this in vitro study was to evaluate the effect of different beverages on the hardness of two temporary acrylic-based soft lining materials and their bond strength to the denture base resin. Materials and Method: For the hardness test; a total of 80 rectangular specimens (40mm×10mm×3mm) were fabricated from a heat-polymerized polymethylmethacrylate. Two commercially auto-polymerized acrylic resin-based resilient liners; Coe-Soft and Visco-gel were prepared according to the manufacturers’ instructions and applied on the specimens. For the tensile test, 160 cylindrical specimens (30mm×10mm) were prepared. The liners were added between specimens with a thickness of 3 mm. The specimens of both soft liners were divided into 4 groups (n=10) and immersed in distilled water as the control group, Coca-Cola, 8% and 50% ethanol. All groups were stored in separate containers at 37oC for 12 days. All beverages were changed daily. The hardness was determined using a Shore A durometer and tensile bond strength was determined in a ZwickRoell testing machine at a cross-head speed of 5mm/min. The results were analyzed using two-way ANOVA. Results: There was no significant interaction between the soft liners and the drinks for both hardness (p= 0.748) and bond strength (p= 0.902). There were statistically significant differences between all drinks for both hardness (p< 0.001) and bond strength (p< 0.05). Conclusion: Within the limitations of this study, it seems that drinking Coca-Cola and alcoholic beverages would not be potentially causing any problems for the temporary acrylic soft liners. PMID:24724142

Safari, A; Vojdani, M; Mogharrabi, S; Iraji Nasrabadi, N; Derafshi, R

2013-01-01

367

Partial reinforcement in the turtle  

Microsoft Academic Search

Two matched groups of young turtles, Pseudemys scripta elegans, were trained in a simple runway, one with partial and the other with consistent reinforcement, following which both were extinguished. The two groups did not differ significantly in resistance to extinction. This finding constitutes further evidence against the hypothesis that the paradoxical effect of partial reinforcement which is found in higher

Rochelle M. Eskin; M. E. Bitterman

1961-01-01

368

Comparison of Impact Strength and Fracture Morphology of Different Heat Cure Denture Acrylic Resins: An In vitro Study  

PubMed Central

Background: The fracture of acrylic resin denture is rather common occurrence and causes inconvenience to the patients. This study was carried out to evaluate and compare the impact strength and fracture morphology of four different heat cure acrylic materials. Materials and Methods: Acrylic resin specimens were prepared using preformed metal die of dimension 65 × 10 × 3 mm. The specimens were finished, polished and subjected to impact strength evaluation using impact testing machine. The loads at which the specimens fracture are recorded and subjected to statistical analysis. Fracture surface analysis was done. Macroscopic analysis was performed by visual inspection of the fractured surfaces using a stereoscopic microscope. About 5 mm sections of all the fragments were subjected to scanning electron microscopy for microscopic analysis to verify fracture morphology. Results: Mean values of the impact strength were compared by statistical methods. The impact strength data were subjected to variance homogeneity tests. Fracture surface analysis data was analyzed by statistical methods. The mean impact strength of Lucitone 199 was higher than Acrylyn-H, DPI Heat cure & Trevalon. Conclusion: Within the limitations of this study, it was concluded that the impact strength of the acrylic resins is affected by the reinforcement of fibers. Increased intermediate fractures increased impact strength. Brittle fractures morphology showed fewer undercuts and clearer surface. Intermediate fractures morphology showed more undercuts than clear surfaces.

Praveen, B; Babaji, Harsha V; Prasanna, B G; Rajalbandi, Santosh Kumar; Shreeharsha, T V; Prashant, G M

2014-01-01

369

A New Form of Intraoral Delivery of Antifungal Drugs for the Treatment of Denture-Induced Oral Candidosis  

PubMed Central

Objectives To monitor the release of the antifungal drugs Fluconazole, Chlorhexidine and a combination of the two from an auto-polymerized poly (methyl methacrylate) (PMMA) denture base resin; and to investigate the effect of the released drugs upon the growth of Candida albicans. Methods A high performance liquid chromatography-Ultra violet (HPLC-UV) method was used in the analysis of the released drugs into distilled water from PMMA discs doped with the antifungal drugs Fluconazole (10%), Chlorhexidine (10%) and a combination of the two drugs (5% each). The antifungal efficacy of the released drugs was monitored, microbiologically, employing “well” technique on a Saborauds culture medium inoculated with a resistant strain of Candida albicans. Results It was shown that Fluconazole, Chlorhexidine and the combination of the two drugs can be successfully incorporated with PMMA. It was found that the drugs leach steadily out of the PMMA resin into distilled water at mouth temperature and that sustained drug release continued throughout the 28 days test period. It was also shown that the released drugs demonstrated an antifungal activity against the resistant Candida albicans and this was most remarkable in the combined drugs samples. Conclusions The findings of this investigation have a clinical value in terms of their significant contribution to the treatment of fungal infections of the oral cavity. The sustained release of anti-fungal drugs from the PMMA resin clearly constitutes a new dosage form of these drugs via the poly (methyl methacrylate) delivery system. PMID:19826596

Amin, Wala M.; Al-Ali, Muna H.; Salim, Nesreen A.; Al-Tarawneh, Sandra K.

2009-01-01

370

Partial confinement photonic crystal waveguides  

SciTech Connect

One-dimensional photonic crystal waveguides with an incomplete photonic band gap are modeled and proposed for an integration application that exploits their property of partial angular confinement. Planar apodized photonic crystal structures are deposited by plasma enhanced chemical vapor deposition and characterized by reflectivity as a function of angle and polarization, validating a partial confinement design for light at 850 nm wavelength. Partial confinement identifies an approach for tailoring waveguide properties by the exploitation of conformal film deposition over a substrate with angularly dependent topology. An application for an optoelectronic transceiver is demonstrated.

Saini, S.; Hong, C.-Y.; Pfaff, N.; Kimerling, L. C.; Michel, J. [Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2008-12-29

371

Thymectomy through lateralized partial sternotomy  

PubMed Central

A young woman with nonthymomic myasthenia gravis with failure of medical treatment was offered thymectomy through partial sternotomy. Shifting of vertical arm of “L” incision laterally avoids fracture of opposite sternal flange and provides better sternal stability postoperatively. PMID:22022149

Mohite, Prashant N.; Rana, Sandip Singh; Sadasivan, Prasanth; Deshpande, Swapnil

2011-01-01

372

Partial belief and expert testimony  

E-print Network

My dissertation investigates two questions from within a partial belief framework: First, when and how should deference to experts or other information sources be qualified? Second, how closely is epistemology related to ...

Briggs, Rachael (Rachael Amy)

2009-01-01

373

[Hemodynamics in the pulp of abutment teeth after their preparation for metal-ceramic denture restoration at various degree of lateral wall convergence].  

PubMed

Reaction of the pulp to degree-by-degree changes (from 3 to 18 degrees) in inclination of lateral walls of abutment teeth during preparation for cermet dentures was studied by the functional diagnosis methods (electroodontodiagnosis, rheodentography) in 50 patients with intact abutment teeth. Changes in dental pulp electric conductivity and hemodynamics depended on the inclination angle formed during preparation. The optimal safe angle of the lateral wall inclination was determined to be 3-12 degrees. Increase of the angle (> 12 degrees) can lead to traumatic pulpitis. PMID:11548291

Abakarov, S I; Loginova, N K; Sorokin, D V

2001-01-01

374

Scrolling partially ordered event displays  

Microsoft Academic Search

Understanding the partial-order relationship between events is critical to understand the behaviour of a distributed or parallel application. Many problems need to be solved in order to provide an accurate and useful display of a large partial order, such as will occur during the execution of any non-trivial application. A display will most likely resemble a process-time diagram, but the

David Taylor

2005-01-01

375

Influence of acrylamide monomer addition to the acrylic denture-base resins on mechanical and physical properties.  

PubMed

The aim of the study was to evaluate the effect of adding acrylamide monomer (AAm) on the characterization, flexural strength, flexural modulus and thermal degradation temperature of poly(methyl methacrylate) (PMMA) denture-base resins. Specimens (n=10) were fabricated from a conventional heat-activated QC-20 (Qc-) and a microwave heat-activated Acron MC (Ac-) PMMA resins. Powder/liquid ratio followed the manufacturer's instructions for the control groups (Qc-c and Ac-c) and for the copolymer groups, the resins were prepared with 5% (-5), 10% (-10), 15% (-15) and 20% (-20) acrylamide contents, according to the molecular weight ratio, respectively. The flexural strength and flexural modulus were measured by a three-point bending test. The data obtained were statistically analyzed by Kruskal-Wallis test (?=0.05) to determine significant differences between the groups. The chemical structures of the resins were characterized by the nuclear magnetic resonance spectroscopy. Thermal stabilities were determined by thermogravimetric analysis (TGA) with a heating rate of 10 °C?min(-1) from 35 °C to 600 °C. Control groups from both acrylic resins showed the lowest flexural strength values. Qc-15 showed significant increase in the flexural strength when compared to Qc-c (P<0.01). Ac-10 and Ac-15 showed significance when compared to Ac-c (P<0.01). Acrylamide incorporation increased the elastic modulus in Qc-10, Qc-15 and Qc-20 when compared to Qc-c (P<0.01). Also significant increase was observed in Ac-10, Ac-15 and Ac-20 copolymer groups when compared to Ac-c (P<0.01). According to the (1)H-nuclear magnetic resonance (NMR) results, acrylamide copolymerization was confirmed in the experimental groups. TGA results showed that the thermal stability of PMMA is increased by the insertion of AAm. PMID:24030556

Aydogan Ayaz, Elif; Durkan, Rukiye

2013-12-01

376

Influence of acrylamide monomer addition to the acrylic denture-base resins on mechanical and physical properties  

PubMed Central

The aim of the study was to evaluate the effect of adding acrylamide monomer (AAm) on the characterization, flexural strength, flexural modulus and thermal degradation temperature of poly(methyl methacrylate) (PMMA) denture-base resins. Specimens (n=10) were fabricated from a conventional heat-activated QC-20 (Qc-) and a microwave heat-activated Acron MC (Ac-) PMMA resins. Powder/liquid ratio followed the manufacturer's instructions for the control groups (Qc-c and Ac-c) and for the copolymer groups, the resins were prepared with 5% (?5), 10% (?10), 15% (?15) and 20% (?20) acrylamide contents, according to the molecular weight ratio, respectively. The flexural strength and flexural modulus were measured by a three-point bending test. The data obtained were statistically analyzed by Kruskal–Wallis test (?=0.05) to determine significant differences between the groups. The chemical structures of the resins were characterized by the nuclear magnetic resonance spectroscopy. Thermal stabilities were determined by thermogravimetric analysis (TGA) with a heating rate of 10 °C?min?1 from 35 °C to 600 °C. Control groups from both acrylic resins showed the lowest flexural strength values. Qc-15 showed significant increase in the flexural strength when compared to Qc-c (P<0.01). Ac-10 and Ac-15 showed significance when compared to Ac-c (P<0.01). Acrylamide incorporation increased the elastic modulus in Qc-10, Qc-15 and Qc-20 when compared to Qc-c (P<0.01). Also significant increase was observed in Ac-10, Ac-15 and Ac-20 copolymer groups when compared to Ac-c (P<0.01). According to the 1H-nuclear magnetic resonance (NMR) results, acrylamide copolymerization was confirmed in the experimental groups. TGA results showed that the thermal stability of PMMA is increased by the insertion of AAm. PMID:24030556

Aydogan Ayaz, Elif; Durkan, Rukiye

2013-01-01

377

Influence of various metal oxides on mechanical and physical properties of heat-cured polymethyl methacrylate denture base resins  

PubMed Central

PURPOSE To evaluate the effect of various metal oxides on impact strength (IS), fracture toughness (FT), water sorption (WSP) and solubility (WSL) of heat-cured acrylic resin. MATERIALS AND METHODS Fifty acrylic resin specimens were fabricated for each test and divided into five groups. Group 1 was the control group and Group 2, 3, 4 and 5 (test groups) included a mixture of 1% TiO2 and 1% ZrO2, 2% Al2O3, 2% TiO2, and 2% ZrO2 by volume, respectively. Rectangular unnotched specimens (50 mm × 6.0 mm × 4.0 mm) were fabricated and droptower impact testing machine was used to determine IS. For FT, compact test specimens were fabricated and tests were done with a universal testing machine with a cross-head speed of 5 mm/min. For WSP and WSL, discshaped specimens were fabricated and tests were performed in accordance to ISO 1567. ANOVA and Kruskal-Wallis tests were used for statistical analyses. RESULTS IS and FT values were significantly higher and WSP and WSL values were significantly lower in test groups than in control group (P<.05). Group 5 had significantly higher IS and FT values and significantly lower WSP values than other groups (P<.05) and provided 40% and 30% increase in IS and FT, respectively, compared to control group. Significantly lower WSL values were detected for Group 2 and 5 (P<.05). CONCLUSION Modification of heat-cured acrylic resin with metal oxides, especially with ZrO2, may be useful in preventing denture fractures and undesirable physical changes resulting from oral fluids clinically. PMID:24049564

Albayrak, Hamdi; Korkmaz, Turan; Turkyilmaz, Ilser

2013-01-01

378

Partial Recovery of Quantum Entanglement  

E-print Network

Suppose Alice and Bob try to transform an entangled state shared between them into another one by local operations and classical communications. Then in general a certain amount of entanglement contained in the initial state will decrease in the process of transformation. However, an interesting phenomenon called partial entanglement recovery shows that it is possible to recover some amount of entanglement by adding another entangled state and transforming the two entangled states collectively. In this paper we are mainly concerned with the feasibility of partial entanglement recovery. The basic problem we address is whether a given state is useful in recovering entanglement lost in a specified transformation. In the case where the source and target states of the original transformation satisfy the strict majorization relation, a necessary and sufficient condition for partial entanglement recovery is obtained. For the general case we give two sufficient conditions. We also give an efficient algorithm for the feasibility of partial entanglement recovery in polynomial time. As applications, we establish some interesting connections between partial entanglement recovery and the generation of maximally entangled states, quantum catalysis, mutual catalysis, and multiple-copy entanglement transformation.

Runyao Duan; Yuan Feng; Mingsheng Ying

2004-04-07

379

Effect of fiber reinforcement on impact strength of heat polymerized polymethyl methacrylate denture base resin: in vitro study and SEM analysis  

PubMed Central

PURPOSE The aim of this in-vitro investigation was to describe the effect of reinforcement with different fibers on impact strength of heat polymerized polymethyl methacrylate (PMMA) denture base resin and to analyze the effect of surface treatment of the fibers on the impact strength. MATERIALS AND METHODS The specimens were fabricated from the dies formed as per standard ASTM D4812. 2% by weight of glass, polyethylene and polypropylene fibers were incorporated in the PMMA resin. The Izod impact testing was performed on the unnotched specimens and the values obtained were analyzed using appropriate one way ANOVA, followed by unpaired t-test. Fractured ends of the samples were subjected to the SEM analysis. RESULTS The polypropylene fibers with plasma treatment showed the highest impact strength (9.229 × 102 J/m) followed by the plasma treated polyethylene fibers (9.096 × 102 J/m), untreated polypropylene fibers (8.697 × 102 J/m), untreated polyethylene fibers (7.580 × 102 J/m), silane treated glass fibers (6.448 × 102 J/m) and untreated glass fibers (5.764 × 102 J/m). Also the surface treatment of all the fibers has shown the significant improvement in impact strength. Findings of the SEM analysis justified the improvement in impact strength after surface treatment. CONCLUSION Reinforcement with the fiber is an effective method to increase the impact strength of PMMA denture base resin. The surface treatment of fibers further increases the impact strength significantly. PMID:22439098

Dange, Shankar Pandurang; Thakre, Mrunali Balkrushna; Kamble, Vaibhav Deorao

2012-01-01

380

Partial decoherence in mesoscopic systems  

NASA Astrophysics Data System (ADS)

The coupling of a mesoscopic system with its environment usually causes total decoherence: at long times the reduced density matrix of the system evolves in time to a limit that is independent of its initial value, losing all the quantum information stored in its initial state. Under special circumstances, a subspace of the system's Hilbert space remains coherent or ‘decoherence-free’, and the reduced density matrix approaches a non-trivial limit that contains information on its initial quantum state, despite the coupling with the environment. This situation is called ‘partial decoherence’. In this paper, we found the conditions for partial decoherence in a mesoscopic system (with N quantum states) that is coupled to its environment. When the Hamiltonian of the system commutes with the total Hamiltonian, one has ‘adiabatic decoherence’, which yields N - 1 time-independent combinations of the reduced density matrix elements. In the presence of a magnetic flux, one can measure circulating currents around loops in the system even at long times and use them to retrieve information on the initial state. For N = 2, we demonstrate that partial decoherence can happen only under adiabatic decoherence conditions. However, for N > 2 we find partial decoherence even when the Hamiltonian of the system does not commute with the total Hamiltonian, and we obtain the general conditions for such a non-adiabatic partial decoherence. For an electron moving on a ring, with N > 2 single-level quantum dots, non-adiabatic partial decoherence can arise only when the total flux through the ring vanishes (or equals an integer number of flux quanta), and therefore there is no asymptotic circulating current.

Aharony, Amnon; Gurvitz, Shmuel; Tokura, Yasuhiro; Entin-Wohlman, Ora; Dattagupta, Sushanta

2012-11-01

381

Partial pressure analysis of plasmas  

SciTech Connect

The application of partial pressure analysis for plasma diagnostic measurements is reviewed. A comparison is made between the techniques of plasma flux analysis and partial pressure analysis for mass spectrometry of plasmas. Emphasis is given to the application of quadrupole mass spectrometers (QMS). The interface problems associated with the coupling of a QMS to a plasma device are discussed including: differential-pumping requirements, electromagnetic interferences from the plasma environment, the detection of surface-active species, ion source interactions, and calibration procedures. Example measurements are presented from process monitoring of glow discharge plasmas which are useful for cleaning and conditioning vacuum vessels.

Dylla, H.F.

1984-11-01

382

Iron deficiency after partial gastrectomy  

Microsoft Academic Search

Iron-deficiency anaemia will develop in half the males and nearly all females after partial gastrectomy, and in addition to causing the anaemia the sideropenia may cause any general symptoms such as lassitude, failure to maintain weight, or dumping symptoms.The variable response to treatment is due to the fact that ferrous iron is not adequately released from coated tablets taken after

J. R. Hobbs

1961-01-01

383

Myopathy in acquired partial lipodystrophy  

Microsoft Academic Search

We describe two women with acquired partial lipodystrophy, one with significant myopathic symptoms and signs. Muscle biopsy of deltoid and quadriceps was performed in each case. The light microscopy findings were of type 1 and type 2 fibre hypertrophy, with an increase in intracytoplasmic fat in both cases. Electron microscopy showed normal fibres, with accumulations of electron-lucent fat droplets between

Richard W. Orrell; Richard C. Peatfield; Carole E. Collins; David F. Woodrow; Jill Moss

1995-01-01

384

Partial duplication of the scapula  

Microsoft Academic Search

We report an extremely rare case of partial scapular duplication. Mild shoulder area deformity in a newborn prompted further evaluation that included radiography, ultrasonography and spiral CT. These revealed an additional bone in the area of the left shoulder, above the humerus and lateral to the scapula. The accessory bone articulated with the upper part of the glenoid and caused

Natalia Simanovsky; Nurith Hiller; Naum Simanovsky

2006-01-01

385

Partially Opened Oven on Phoenix  

NASA Technical Reports Server (NTRS)

This view from the Robotic Arm Camera on NASA's Phoenix Mars Lander shows partial opening of doors to one of the tiny ovens of the Thermal and Evolved-Gas Analyzer.

Each oven has a pair of spring-loaded doors. Near the center of the image, the partial opening of a pair of doors reveals screen over the opening where a soil sample will be delivered. The door to the right is fully opened and the one to the left is partially deployed. The doors are 10 centimeters (4 inches) long. The opening is 4 centimeters (1.5 inches) wide.

Tests on the Phoenix testbed at the University of Arizona, Tucson, indicate that a soil sample could be delivered into the oven through the partially opened doors. Engineers are also exploring possibilities for opening the doors more completely.This image was taken during Phoenix's eighth Martian day, or sol (June 2, 2008).

The Phoenix Mission is led by the University of Arizona, Tucson, on behalf of NASA. Project management of the mission is by NASA's Jet Propulsion Laboratory, Pasadena, Calif. Spacecraft development is by Lockheed Martin Space Systems, Denver.

2008-01-01

386

Management of partial segmental priapism.  

PubMed

We report the cases of 2 patients with partial segmental priapism. The patients presented with pain, a perineal mass, and proximal segmental corporal thrombosis. Treatment consisted of a proximal corpus cavernosal-spongiosum shunt. Diagnostic considerations, literature review, and treatment options are discussed. PMID:11164175

Lewis, J H; Javidan, J; Keoleian, C M; Shetty, S D

2001-01-01

387

The Partial Naivete Euler Equation  

Microsoft Academic Search

This short paper extends the Harris and Laibson (2001) heuristic derivation of the Hyperbolic Euler Equation to the partial naivete set- ting. The result is used to show that if the coe¢ cient of relative risk aversion exceeds one, saving is increasing in sophistication.

Jeremy Tobacman

388

Broadcasting in Partially Ordered Sets  

Microsoft Academic Search

Let be a partial order on a countable set V such that there exists a minimum element a2 V andfu2 V : u vg is nite for each v2 V. An item of information is to be broadcast to the elements ofV according to the policy in the following sense: a is initially informed and broadcasting to v 6= a

Kyle Siegrist

389

The partial-birth stratagem.  

PubMed

In Wisconsin, physicians stopped performing abortions when a Federal District Court Judge refused to issue a temporary restraining order against the state's newly enacted "partial birth" abortion ban that was couched in such vague language it actually covered all abortions. While ostensibly attempting to ban late-term "intact dilation and extraction," the language of the law did not refer to that procedure or to late terms. Instead, it prohibited all abortions in which a physician "partially vaginally delivers a living child, causes the death of the partially delivered child with the intent to kill the child and then completes the delivery of the child." The law also defined "child" as "a human being from the time of fertilization" until birth. It is clear that this abortion ban is unconstitutional under Row v. Wade, and this unconstitutionality is compounded by the fact that the law allowed no exception to protect a woman's health, which is required by Roe for abortion bans after fetal viability. Wisconsin is only one of about 28 states that have enacted similar laws, and only two have restricted the ban to postviability abortions. Many of these laws have been struck down in court, and President Clinton has continued to veto the Federal partial-birth bill. The Wisconsin Judge acknowledged that opponents of the ban will likely prevail when the case is heard, but his action in denying the temporary injunction means that many women in Wisconsin will not receive timely medical care. The partial birth strategy is really only another anti-abortion strategy. PMID:12348556

1998-06-01

390

The derivative of a function of one variable Partial derivatives  

E-print Network

The derivative of a function of one variable Partial derivatives Partial differential equations Partial Differential Equations Introduction Partial Differential Equations #12;The derivative of a function of one variable Partial derivatives Partial differential equations Review Check your understanding

Lega, Joceline

391

Effect of leaching residual methyl methacrylate concentrations on in vitro cytotoxicity of heat polymerized denture base acrylic resin processed with different polymerization cycles  

PubMed Central

Objectives Residual methyl methacrylate (MMA) may leach from the acrylic resin denture bases and have adverse effects on the oral mucosa. This in vitro study evaluated and correlated the effect of the leaching residual MMA concentrations ([MMA]r) on in vitro cytotoxicity of L-929 fibroblasts. Material and Methods A total of 144 heat-polymerized acrylic resin specimens were fabricated using 4 different polymerization cycles: (1) at 74ºC for 9 h, (2) at 74ºC for 9 h and terminal boiling (at 100ºC) for 30 min, (3) at 74ºC for 9 h and terminal boiling for 3 h, (4) at 74ºC for 30 min and terminal boiling for 30 min. Specimens were eluted in a complete cell culture medium at 37ºC for 1, 2, 5 and 7 days. [MMA]r in eluates was measured using high-performance liquid chromatography. In vitro cytotoxicity of eluates on L-929 fibroblasts was evaluated by means of cell proliferation using a tetrazolium salt XTT (sodium 3´-[1-phenyl-aminocarbonyl)-3,4-tetrazolium]bis(4-methoxy-6-nitro)benzenesulphonic acid) assay. Differences in [MMA]r of eluates and cell proliferation values between polymerization cycles were statistically analyzed by Kruskal-Wallis, Friedman and Dunn's multiple comparison tests. The correlation between [MMA]r of eluates and cell proliferation was analyzed by Pearson's correlation test (p<0.05). Results [MMA]r was significantly (p?0.001) higher in eluates of specimens polymerized with cycle without terminal boiling after elution of 1 and 2 days. Cell proliferation values for all cycles were significantly (p<0.01) lower in eluates of 1 day than those of 2 days. The correlation between [MMA]r and cell proliferation values was negative after all elution periods, showing significance (p<0.05) for elution of 1 and 2 days. MMA continued to leach from acrylic resin throughout 7 days and leaching concentrations markedly reduced after elution of 1 and 2 days. Conclusion Due to reduction of leaching residual MMA concentrations, use of terminal boiling in the polymerization process for at least 30 min and water storage of the heat-polymerized denture bases for at least 1 to 2 days before denture delivery is clinically recommended for minimizing the residual MMA and possible cytotoxic effects. PMID:21956586

BURAL, Canan; AKTAS, Esin; DENIZ, Gunnur; UNLUCERCI, Yesim; BAYRAKTAR, Gulsen

2011-01-01

392

Partial domain wall partition functions  

E-print Network

We consider six-vertex model configurations on an n-by-N lattice, n =wall boundary conditions that we define and call "partial domain wall boundary conditions". We obtain two expressions for the corresponding "partial domain wall partition function", as an (N-by-N)-determinant and as an (n-by-n)-determinant. The latter was first obtained by I Kostov. We show that the two determinants are equal, as expected from the fact that they are partition functions of the same object, that each is a discrete KP tau-function, and, recalling that these determinants represent tree-level structure constants in N=4 SYM, we show that introducing 1-loop corrections, as proposed by N Gromov and P Vieira, preserves the determinant structure.

O. Foda; M. Wheeler

2012-05-20

393

The marketing of partial hospitalization.  

PubMed

Health-care professionals are currently operating in the context of a rapidly changing health-care delivery system, including the move away from inpatient services to outpatient services in order to control costs. Those who practice in partial-hospital settings are in a position to offer effective, cost-efficient services; however, there continue to be obstacles which hinder appropriate utilization of the modality. The development and use of a well-designed marketing plan is one strategy for removing these obstacles. This paper presents a brief overview of the marketing process, ideas for developing a marketing plan, and several examples of specific marketing strategies as well as ways to monitor their effectiveness. Partial-hospital providers must take an active role in answering the calls for alternative sources of psychiatric care. A comprehensive, education-oriented marketing approach will increase the public's awareness of such alternatives and enable programs to survive in a competitive environment. PMID:10293240

Millsap, P; Brown, E; Kiser, L; Pruitt, D

1987-09-01

394

Tree reconstruction from partial orders  

SciTech Connect

The problem of constructing trees given a matrix of interleaf distances is motivated by applications in computational evolutionary biology and linguistics. The general problem is to find an edge-weighted tree which most closely approximates the distance matrix. Although the construction problem is easy when the tree exactly fits the distance matrix, optimization problems under all popular criteria are either known or conjectured to be NP-complete. In this paper we consider the related problem where we are given a partial order on the pairwise distances, and wish to construct (if possible) an edge-weighted tree realizing the partial order. In particular we are interested in partial orders which arise from experiments on triples of species, which determine either a linear ordering of the three pairwise distances (called Total Order Model or TOM experiments) or only the pair(s) of minimum distance apart (called Partial Order Model or POM experiments). The POM and TOM experimental model is inspired by the model proposed by Kannan, Lawler, and Warnow for constructing trees from experiments which determine the rooted topology for any triple of species. We examine issues of construction of trees and consistency of TOM and POM experiments, where the trees may either be weighted or unweighted. Using these experiments to construct unweighted trees without nodes of degree two is motivated by a similar problem studied by Winkler, called the Discrete Metric Realization problem, which he showed to be strongly NP-hard. We have the following results: Determining consistency of a set of TOM or POM experiments is NP-Complete whether the tree is weighted or constrained to be unweighted and without degree two nodes. We can construct unweighted trees without degree two nodes from TOM experiments in optimal O(n{sup 3}) time and from POM experiments in O(n{sup 4}) time.

Kannan, S.K. [Arizona Univ., Tucson, AZ (United States); Warnow, T.J. [Sandia National Labs., Albuquerque, NM (United States)

1993-03-01

395

Tree reconstruction from partial orders  

SciTech Connect

The problem of constructing trees given a matrix of interleaf distances is motivated by applications in computational evolutionary biology and linguistics. The general problem is to find an edge-weighted tree which most closely approximates the distance matrix. Although the construction problem is easy when the tree exactly fits the distance matrix, optimization problems under all popular criteria are either known or conjectured to be NP-complete. In this paper we consider the related problem where we are given a partial order on the pairwise distances, and wish to construct (if possible) an edge-weighted tree realizing the partial order. In particular we are interested in partial orders which arise from experiments on triples of species, which determine either a linear ordering of the three pairwise distances (called Total Order Model or TOM experiments) or only the pair(s) of minimum distance apart (called Partial Order Model or POM experiments). The POM and TOM experimental model is inspired by the model proposed by Kannan, Lawler, and Warnow for constructing trees from experiments which determine the rooted topology for any triple of species. We examine issues of construction of trees and consistency of TOM and POM experiments, where the trees may either be weighted or unweighted. Using these experiments to construct unweighted trees without nodes of degree two is motivated by a similar problem studied by Winkler, called the Discrete Metric Realization problem, which he showed to be strongly NP-hard. We have the following results: Determining consistency of a set of TOM or POM experiments is NP-Complete whether the tree is weighted or constrained to be unweighted and without degree two nodes. We can construct unweighted trees without degree two nodes from TOM experiments in optimal O(n[sup 3]) time and from POM experiments in O(n[sup 4]) time.

Kannan, S.K. (Arizona Univ., Tucson, AZ (United States)); Warnow, T.J. (Sandia National Labs., Albuquerque, NM (United States))

1993-01-01

396

Partial-Equilibrium Welfare Analysis  

Microsoft Academic Search

The use of partial equilibrium models is common, and, typically, efficiency is characterized by maximizing consumer plus producer surplus (or, sometimes, gross consumer surplus). The analysis appeals-implicitly or explicitly-to the concept of efficiency derived from general equilibrium models. Using the tax-reform methodology, it is shown in a simple general equilibrium model that, if the second-best outcome is not the first-best

Charles Blackorby

1999-01-01

397

A comparative evaluation of the dimensional accuracy of heat polymerised PMMA denture base cured by different curing cycles and clamped by R S technique and conventional method - An In-vitro study  

PubMed Central

Background: The aim of this study is to evaluate the dimensional accuracy of heat polymerized PMMA denture base clamped by the conventional method and by R.S technique and cured by a different curing cycle. Materials & Methods: In this study, a total of 40 standardized maxillary record bases were fabricated with seven reference points: Point A - Incisive papilla, Point B & C - Canine region on either side, Point E & G - Midpoint of tuberosities on either side, Point F- Midpoint of the line joining the two tuberosities, Point D- Midpoint between the line joining A and F. Group A: Ten maxillary record bases were fabricated by conventional clamping method and cured by long curing cycle. Group A1: Ten maxillary record bases were fabricated by R.S tension clamping method and cured by long curing cycle. Group B: Ten maxillary record bases were fabricated by conventional clamping method and cured by short curing cycle. Group B1: Ten maxillary record bases were fabricated by R.S tension clamping method and cured by short curing cycle. The distances between the reference points i.e. A-B, A-C, A-D, D-F, B-E, C-G, E-F, F-G, B-D, D-G, CD, D-E of all three thermoplastic denture base plates were measured and recorded with the help of a travelling microscope and were used for comparison with the measured and recorded readings of processed acrylic denture bases. The data obtained was analyzed by using the One Way Analysis of Variance. Results: The overall results of the in vitro study indicate that among all the PMMA bases cured by the two clamping systems and the different curing cycle, group A` was the most dimensionally stable, followed by control group A, then followed by B` and B was most unstable. Conclusion: The study concluded that the denture bases fabricated by the R.S Technique using the long curing cycle would produce the most dimensionally stable PMMA denture bases. How to cite the article: Babu MR, Rao CS, Ahmed ST, Bharat JS, Rao NV, Vinod V. A comparative evaluation of the dimensional accuracy of heat polymerised PMMA denture base cured by different curing cycles and clamped by R S technique and conventional method – An In-vitro study. J Int Oral Health 2014;6(2):68-75. PMID:24876705

Babu, Mandava Ramesh; Rao, C Satyanageswar; Ahmed, Syed Tauqheer; Bharat, J S V; Rao, N Venugopal; Vinod, V

2014-01-01

398

The effect of mechanical and chemical polishing techniques on the surface roughness of heat-polymerized and visible light-polymerized acrylic denture base resins  

PubMed Central

Objective The purpose of this study was to compare the effects of mechanical polishing (MP) and chemical polishing (CP) on the average surface roughness (Ra) of heat-cured (HC) and light-cured (LC) denture base acrylic resins. Methods A total of 120 specimens (30 × 15 × 3 mm) were prepared from one HC and one LC acrylic resin. To remove nodules and gross surface irregularities, all specimens were finished with a lathe-mounted small acrylic bur and 360-grit sandpaper. Ten finished specimens of each acrylic resin were randomly assigned to each of six polishing techniques: Resilit High-luster Polishing Liquid (RHPL), Universal Polishing Paste, Abraso-star K50, pumice, Jet Seal Liquid, or Acrypoint. MP was performed with an automatic polishing machine for 2 min, under 50 rpm and 500 g of load. CP was performed by immersing the HC and LC specimens in preheated methyl methacrylate at 75 ± 1 °C for 10 s. The surface roughness of the acrylic resin specimens was measured with a contact profilometer. The Ra values were analyzed by two-way analysis of variance, post hoc Scheffe's test, and paired t-test (p ? 0.05). Polished and tested acrylic resin surfaces were evaluated by scanning electron microscopy. Results MP was more effective than CP. The smoothest surface was obtained with the use of the RHPL on the LC (0.05 ± 0.01 ?m) or HC (0.07 ± 0.01 ?m) acrylic resin. Two-way ANOVA showed a statistically significant difference between MP and CP. Conclusions MP produced the smoothest surface of denture base acrylic resin. The mean surface roughness values after MP and CP were not influenced by the type of acrylic resin.

Al-Kheraif, Abdul Aziz Abdullah

2014-01-01

399

Quantum Algorithm for Partial Search  

NASA Astrophysics Data System (ADS)

Searching and sorting is used as subroutines in many important algorithms. Grover discovered a quantum algorithm that searches faster than any classical algorithm. If we want less information we can do it faster. Partial search used to find an approximate location of the target item. An example: the exact location of the target item is given by a sequence of many bits, but we want to find only some of them. A partial search considers the following problem: a database is separated into several blocks. We want to find a block with the target item, not the target item itself. Efficiency of search algorithms is measured by number of queries to the oracle [total number of iterations]. Partial search can use the same hardware as the full search. Essential references follow:=> 1) K. Grover, Quantum Mechanics helps in searching for a needle in a haystack, Phys. Rev. Letters, 78(2), 325, 1997. 2) L. K. Grover and J.Radhakrishnan, quant-ph/0407122, 3) V. E. Korepin and L. K. Grover, e-print quant-ph/0504157; Quantum Information Processing, vol. 5, issue 1, page 3, 2006, 4) V. E. Korepin, Journal of Physics A: Math. Gen. vol 38, pages L731-L738, 2005 see also quant-ph/0503238 5) V.E. Korepin, J. Liao, quant-ph/0510179 6) B.-S. Choi, T. A. Walker, S. L. Braunstein, e-print quant-ph/0603136 7) B-S Choi, V. E Korepin, quant-ph/0608106 8) V. E. Korepin, B. C. Vallilo, quant-ph/0609205

Korepin, Vladimir

2007-03-01

400

Partial Observables in Extended Systems  

E-print Network

We consider "unphysical", kinematic observables that do not commute with the constraints of a gauge system in the context of an extension of the system. We show that these observables, while not predictable, can nevertheless be said to have a physical interpretation. They implement Rovelli's concept of partial and relational observables. We investigate the propositional structure of these observables and point out interpretational issues. We find that to make relational statements in the quantum theory one must deal directly with these observables. In particular we argue that in this scenario the spectra of kinematic observables are what is experimentally accessible.

Frank Hellmann

2008-12-03

401

Partial Synchronization on Complex Networks  

E-print Network

Network topology plays an important role in governing the collective dynamics. Partial synchronization (PaS) on regular networks with a few non-local links is explored. Different PaS patterns out of the symmetry breaking are observed for different ways of non-local couplings. The criterion for the emergence of PaS is studied. The emergence of PaS is related to the loss of degeneration in Lyapunov exponent spectrum. Theoretical and numerical analysis indicate that non-local coupling may drastically change the dynamical feature of the network, emphasizing the important topological dependence of collective dynamics on complex networks.

Bin Ao; Zhigang Zheng

2005-12-15

402

Marginal fit of anterior 3-unit fixed partial zirconia restorations using different CAD/CAM systems  

PubMed Central

PURPOSE Few studies have investigated the marginal accuracy of 3-unit zirconia fixed partial dentures (FPDs) fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM) system. The purpose of this study was to compare the marginal fit of zirconia FPDs made using two CAD/CAM systems with that of metal-ceramic FPDs. MATERIALS AND METHODS Artificial resin maxillary central and lateral incisors were prepared for 3-unit FPDs and fixed in yellow stone. This model was duplicated to epoxy resin die. On the resin die, 15 three-unit FPDs were fabricated per group (45 in total): Group A, zirconia 3-unit FPDs made with the Everest system; Group B, zirconia 3-unit FPDs made with the Lava system; and Group C, metal-ceramic 3-unit FPDs. They were cemented to resin dies with resin cement. After removal of pontic, each retainer was separated and observed under a microscope (Presize 440C). Marginal gaps of experimental groups were analyzed using one-way ANOVA and Duncan test. RESULTS Mean marginal gaps of 3-unit FPDs were 60.46 µm for the Everest group, 78.71 µm for the Lava group, and 81.32 µm for the metal-ceramic group. The Everest group demonstrated significantly smaller marginal gap than the Lava and the metal-ceramic groups (P<.05). The marginal gap did not significantly differ between the Lava and the metal-ceramic groups (P>.05). CONCLUSION The marginal gaps of anterior 3-unit zirconia FPD differed according to CAD/CAM systems, but still fell within clinically acceptable ranges compared with conventional metal-ceramic restoration. PMID:24049561

Song, Tae-Jin; Kwon, Taek-Ka; Han, Jung-Suk; Lee, Jai-Bong; Kim, Sung-Hun

2013-01-01

403

LAPAROSCOPIC PARTIAL NEPHRECTOMY FOR HILAR TUMORS  

Microsoft Academic Search

PurposePartial nephrectomy for hilar tumors represents a technical challenge not only for laparoscopic, but also for open surgeons. We report the technical feasibility and perioperative outcomes of laparoscopic partial nephrectomy (LPN) for hilar tumors.

INDERBIR S. GILL; JOSE R. COLOMBO; IGOR FRANK; ALIREZA MOINZADEH; JIHAD KAOUK; MIHIR DESAI

2005-01-01

404

Adult Partial Hospitalization JOHN DEMPSEY HOSPITAL  

E-print Network

Adult Partial Hospitalization Program JOHN DEMPSEY HOSPITAL CONTACT US For further information.uchc.edu. The Adult Partial Hospitalization Program is available Monday through Friday from 9 a.m. to 2:05 p.m. OUR LOCATION AND DIRECTIONS The Adult Partial Hospitalization Program is located on the 5th floor of the John

Oliver, Douglas L.

405

Partial Evaluation for Hierarchies of Logic Theories  

Microsoft Academic Search

We discuss the impact of Partial Evaluation within the framework of structured logic pro- gramming. We dene a general scheme for Partial Evaluation to be applied to a wide class of structuring policies for logic programming, capable of supporting both block- and inheritance- based systems. We show how the properties of soundness and completeness of Partial Evaluation in Logic Programming

Michele Bugliesi; Evelina Lamma; Paola Mello

1990-01-01

406

Project scheduling under partially renewable resource constraints  

Microsoft Academic Search

We consider a generalization of the classical resource constrained project scheduling problem. We introduce so-called partially renewable resources by assuming for each resource a capacity on subsets of periods. The concept of partially renewable resources is a fundamental tool in order to make, e.g., timetabling and shift scheduling aspects, amenable to project scheduling. In addition, partially renewable resources serve to

Jan Böttcher; Andreas Drexl; Rainer Kolisch; Frank Salewski

1999-01-01

407

Partial ACL rupture: an MR diagnosis?  

Microsoft Academic Search

Purpose. We sought to clarify the ability of magnetic resonance imaging (MR) to show partial ante- rior cruciate ligament (ACL) ruptures and to allow dis- tinction of partial from complete ACL ruptures. Materials and methods. Eighty-eight patients were stud- ied by arthroscopy and MR (36 with normal ACLs, 21 with partial ACL ruptures, and 31 with complete ACL ruptures). MR

Lawrence Yao; Amilcare Gentili; Leonard Petrus; Joong K. Lee

1995-01-01

408

What Are Dentures?  

MedlinePLUS

... teeth twice a day with a toothpaste containing fluoride. Use a toothbrush with soft bristles, and try ... a friend Reprint guidelines Sign up for our free weekly eNewsletters here About KidsHealth About Nemours Contact ...

409

Partial solvability from Duality Transformations  

E-print Network

When weak and strong coupling expansions describe different phases, their radii of convergence correspond to the extent of these phases. We study finite size systems for which both series expansions are analytic and must therefore converge to the very same function. Equating these expansions leads to severe constraints which "partially solve" various systems. We examine as concrete test cases (both ferromagnetic and spin-glass) Ising models and gauge type theories on finite periodic hypercubic lattices in 1hardness of general D>2 Ising theories is "localized" to this fraction. When the self-duality of the D=2 Ising model is invoked, the number of requisite coefficients is further halved; all remaining coefficients are determined by linear combinations of this subset. The obtained linear equations imply an extensive set of geometrical relations between the numbers of closed loops/surfaces, etc., of fixed size in general dimensions and relate derived coefficients to polytope volumes. Our analysis sheds light on a connection between solvability and dualities by exhausting all of the relations that dualities imply on series expansion. General self-dualities (for both finite and infinite size systems) solve the "Babbage equation" F(F(z)) = z with F a map relating weak to strong couplings.

Zohar Nussinov; Gerardo Ortiz; Mohammad-Sadegh Vaezi

2013-11-26

410

Representations of partial derivatives in thermodynamics  

NASA Astrophysics Data System (ADS)

One of the mathematical objects that students become familiar with in thermodynamics, often for the first time, is the partial derivative of a multivariable function. The symbolic representation of a partial derivative and related quantities present difficulties for students in both mathematical and physical contexts, most notably what it means to keep one or more variables fixed while taking the derivative with respect to a different variable. Material properties are themselves written as partial derivatives of various state functions (e.g., compressibility is a partial derivative of volume with respect to pressure). Research in courses at the University of Maine and Oregon State University yields findings related to the many ways that partial derivatives can be represented and interpreted in thermodynamics. Research has informed curricular development that elicits many of the difficulties using different representations (e.g., geometric) and different contexts (e.g., connecting partial derivatives to specific experiments).

Thompson, John R.; Manogue, Corinne A.; Roundy, David J.; Mountcastle, Donald B.

2012-02-01

411

Incremental Learning with Partial Instance Memory  

E-print Network

stores some examples (e.g., lair, hillary, flora, darling, MetaL(b), MetaL(ib), aq­pm, aq11­pm) Slide 6 partial memory full instance AQ­PM DARLING AQ­15c C4.5 memory no instance STAGGER Winnow CN2 partial for Partial Memory . lair: the first positive example only . hillary: only the negative examples . darling

Maloof, Mark

412

Classical simulation of partially entangled states  

E-print Network

We investigate the possibility of simulating partially entangled two qubit states by separable states of higher spins. First, we show that all partially entangled isotropic states can be simulated classically. We further investigate partially entangled pure states, and their binary mixtures and find that these systems forbid such a simulation, signifying that separability does not have a universal character in determining the inherent quantum nature of a state.

H. M. Bharath; V. Ravishankar

2012-10-02

413

Partially entangled states bridge in quantum teleportation  

NASA Astrophysics Data System (ADS)

The traditional method for information transfer in a quantum communication system using partially entangled state resource is quantum distillation or direct teleportation. In order to reduce the waiting time cost in hop-by-hop transmission and execute independently in each node, we propose a quantum bridging method with partially entangled states to teleport quantum states from source node to destination node. We also prove that the designed specific quantum bridging circuit is feasible for partially entangled states teleportation across multiple intermediate nodes. Compared to two traditional ways, our partially entanglement quantum bridging method uses simpler logic gates, has better security, and can be used in less quantum resource situation.

Cai, Xiao-Fei; Yu, Xu-Tao; Shi, Li-Hui; Zhang, Zai-Chen

2014-10-01

414

Effect of processing variables (different compression packing processes and investment material types) and time on the dimensional accuracy of polymethyl methacrylate denture bases.  

PubMed

In this study we determined the effect of different compression packing processes, investment materials (a hemihydrate and dental stone) and time on the dimensional accuracy of polymethyl metacrylate denture bases. Square stainless steel plates (15 mm x 15 mm x 5 mm) were prepared to make an acrylic resin specimen. The linear dimensional changes of acrylic resin were determined by measuring the distances of fix points. Measurements were made at 24 hours, 48 hours, 12 days and 30 days after setting with a digital compass. Dimensional changes of test specimens that were obtained with three different flasks and two press techniques were compared by univariate analysis. Measurements of the linear dimensions of specimens cured by different compression packing techniques suggested that differences existed. The time interval differences were not significant. According to the results; flask and investment material types affect the dimensional accuracy of test specimens (p < 0.05). The least dimensional change observed in the specimens was obtained with Type 1 flask-dental stone-manual press combinations. PMID:12873123

Baydas, Seyfettin; Bayindir, Funda; Akyil, M Samil

2003-06-01

415

Quantitative analysis of masseter and temporalis EMGs: a comparison of anterior guided versus balanced occlusal concepts in patients wearing complete dentures.  

PubMed

The lack of easily measurable, objective physiological activity parameters of the masseter and temporalis muscle during jaw movements in humans has led to the consideration to revise data of surface electromyographies (EMGs) by applying a computerized quantification method. The aim of this follow-up analysis was to get quantitative data out of EMG-records of an earlier study. These records were obtained with two different splints, splint 1 providing an anterior front-canine guidance and splint 2 providing bilateral balanced occlusion. Utilizing a computer aided integration method led to numeric results which statistically proves the prediction of the previous investigation. Applying the integration method, the EMG raw signal was transformed into area-values which enabled a statistical work up of the data. Wilcoxon test statistics shows a significant (P<0.05) lower muscle activity in patients wearing dentures providing anterior front-canine guidance compared to those with balanced occlusion. It is concluded that the neuromuscular activity of the elevator muscles is highly reproducible and that the neuromuscular function is similar in edentulous subjects to that found in people with natural teeth. Furthermore, the study statistically proves earlier visual data that all those subjects, whose muscle activities were observed with anterior guidance (splint 1) compared to bilateral balanced occlusion (splint 2) showed significantly lower values with regard to subjects wearing splint 2. PMID:10520148

Grubwieser, G; Flatz, A; Grunert, I; Kofler, M; Ulmer, H; Gausch, K; Kulmer, S

1999-09-01

416

Acute encephalitis with refractory, repetitive partial seizures  

Microsoft Academic Search

Acute encephalitis with refractory, repetitive partial seizures (AERRPS) represents a peculiar form of encephalitis mainly affecting children. They usually present abruptly with seizure or impaired consciousness as well as high-grade fever following antecedent infection. Seizures in AERRPS are almost exclusively of localized origin, whose semiology includes eye deviation, hemifacial twitching, hemiclonic convulsion, and autonomic manifestations. Partial seizures are brief, but

Hiroshi Sakuma

2009-01-01

417

The Fourth Partial Derivative In Transport Dynamics  

E-print Network

A new fourth partial derivative is introduced for the study of transport dynamics. It is a Lagrangian partial derivative following the path of diffusion, not the path of convection. Use of this derivative decouples the effect of diffusion and convection and simplifies the analysis of transport processes.

Trinh Khanh Tuoc

2010-01-11

418

Partial least-squares regression: a tutorial  

Microsoft Academic Search

SUMMARY A tutorial on the partial least-squares (PLS) regression method is provided. Weak points in some other regression methods are outlined and PLS is developed as a remedy for those weaknesses. An algorithm for a predictive PLS and some practical hints for its use are given. The partial least-squares regression method (PLS) is gaining importance in many fields of chemistry;

PAUL GELADI; BRUCE R. KOWALSKI

1986-01-01

419

Partial dearterialization of the liver allograft  

Microsoft Academic Search

The clinical course of five patients with partial dearterialization of their hepatic allografts is described. One patient died and three others suffered serious morbidity as a direct or indirect result of this complication. Partial dearterialization of the liver allograft is a serious and potentially life-threatening complication for which preservation of the complete hepatic arterial supply is important, even if this

K. Yanaga; A. G. Tzakis; T. E. Starzl

1990-01-01

420

Partial hydrogenation of benzene to cyclohexene  

Microsoft Academic Search

We (Asahi Chemical Industy Co., Ltd.) have developed a technology for a highly selective partial hydrogenation of benzene to cyclohexene and succeeded in the commercialization of a new production process for producing cyclohexanol from benzene through cyclohexene. The process has been considered to be difficult for a long time in the industry. Several innovative technologies made the partial hydrogenation reaction

H. Nagahara; M. Ono; M. Konishi; Y. Fukuoka

1997-01-01

421

Partial segmental thrombosis of the corpus cavernosum.  

PubMed

The case of a 32-year-old man with perineal pain and local swelling is presented. Partial segmental thrombosis of the corpus cavernosum was diagnosed and treated conservatively with systemic anticoagulants. Conservative management proved to be a safe and successful therapeutic option in partial thrombosis of the corpus cavernosum. PMID:24578910

G?uchowski, Jaros?aw; B?awat, Adam; Kordasz, Janusz; Jeli?ski, Artur; Lazarczyk, Anna

2011-01-01

422

Partial segmental thrombosis of the corpus cavernosum  

PubMed Central

The case of a 32-year-old man with perineal pain and local swelling is presented. Partial segmental thrombosis of the corpus cavernosum was diagnosed and treated conservatively with systemic anticoagulants. Conservative management proved to be a safe and successful therapeutic option in partial thrombosis of the corpus cavernosum. PMID:24578910

Blawat, Adam; Kordasz, Janusz; Jelinski, Artur; Lazarczyk, Anna

2011-01-01

423

Incremental Learning with Partial Instance Memory  

E-print Network

(e.g., lair, hillary, flora, darling, MetaL(b), MetaL(ib), aq-pm, aq11-pm) Slide 6 partial memory full instance AQ-PM DARLING AQ-15c C4.5 memory no instance STAGGER Winnow CN2 partial · lair: the first positive example only · hillary: only the negative examples · darling: examples near

Maloof, Mark

424

Evaluating Models for Partially Clustered Designs  

ERIC Educational Resources Information Center

Partially clustered designs, where clustering occurs in some conditions and not others, are common in psychology, particularly in prevention and intervention trials. This article reports results from a simulation comparing 5 approaches to analyzing partially clustered data, including Type I errors, parameter bias, efficiency, and power. Results…

Baldwin, Scott A.; Bauer, Daniel J.; Stice, Eric; Rohde, Paul

2011-01-01

425

Partial oxidation process with production of power  

Microsoft Academic Search

Power is developed by an expansion turbine in which the working fluid is a gaseous mixture comprising all of the hot raw gas stream leaving an unpacked partial oxidation gas generator, after removing, if present, a portion of the entrained solids, in admixture with a temperature moderating stream. A molal increase is associated with the partial oxidation process. Power is

E. M. Barber; J. R. Muenger; D. L. Alexander; W. G. Schlinger

1978-01-01

426

[Laparoscopic partial nephrectomy: technique and outcomes].  

PubMed

The indication of laparoscopic partial nephrectomy (LPN) has evolved considerably, and the technique is approaching established status at our institution. Over the past 5 years, the senior author has performed more than 450 laparoscopic partial nephrectomies at the Cleveland Clinic. Herein we present our current technique, review contemporary data and oncological outcomes of LPN. PMID:16884101

Colombo, J R; Gill, I S

2006-05-01

427

Nested hierarchical controller with partial autonomy  

NASA Technical Reports Server (NTRS)

The problem of computer architecture for intelligent robots with partial autonomy is addressed. A robot with partial autonomy is considered a degenerated case of a fully autonomous robot. Thus, the problem of man-machine communication is formulated, and the conditions are determined for generating a language for such a communication. The duties of the master are determined.

Meystel, A.

1987-01-01

428

Arthroscopic surgery for partial rotator cuff tears  

Microsoft Academic Search

Rotator cuff pathology is one of the most common disorders of the shoulder. However, partial rotator cuff tears, treatment, and natural history are still in a state of flux. We believe that partial rotator cuff tears should be treated surgically when the rotator cuff is torn more than 50% of the thickness or when substantial thinning of the rotator cuff

Richard C Lehman; Clayton R Perry

2003-01-01

429

Partial cubes: structures, characterizations, and constructions  

E-print Network

Partial cubes: structures, characterizations, and constructions Sergei Ovchinnikov San Francisco cubes are isometric subgraphs of hypercubes. Structures on a graph defined by means of semicubes, and Djokovi´c's and Winkler's relations play an important role in the theory of partial cubes

Ovchinnikov, Sergei

430

Mechanizing the Traditional Approach to Partial Functions ?  

E-print Network

Mechanizing the Traditional Approach to Partial Functions ? William M. Farmer The MITRE Corporation, 202 Burlington Road, Bedford, MA 01730-1420, USA Abstract. In traditional mathematics it is legitimate the presence of nondenoting terms. This paper shows how this traditional approach to partial func- tions can

Farmer, William M.

431

The partial metrics system: modeling the stepwise refinement process using partial metrics  

Microsoft Academic Search

The Partial Metrics System design is explained, with an emphasis on the refinement process. A model, with its three phases, shows that the pseudocode refinement process can be monitored in partial metric terms.

Robert G. Reynolds

1987-01-01

432

Automated Ocular Localization in Thermographic Sequences of Contact Lens Wearer  

Microsoft Academic Search

\\u000a Nowadays, infrared (IR) imaging is widely used in the detection of breast cancer, eye abnormalities, impotency, and blood\\u000a flow in the muscles. An algorithm to correctly localize the eye and cornea in IR thermogram of contact lenser using gradient\\u000a vector flow (GVF) snake coupled with target tracking function was used in a sequence of thermogram images. The target tracking\\u000a function

Jen-Hong Tan; E. Y. K. Ng; U Rajendra Acharya; Jasjit S. Suri

433

Do tinted spectacle lens wearers have a different personality?  

PubMed

The wearing of tinted spectacle lenses is considered by some health care workers to be a marker of psychopathology or a hypochondriacal personality type. The purpose of this study was to determine whether there is a relationship between the wearing of tinted spectacle lenses and personality type in physically healthy subjects. The Sixteen Personality Factor Questionnaire 5th Edition, a multidimensional standardized self-report inventory, was used to determine the personality type of 98 participants. Twenty currently wore tinted spectacle lenses for reasons other than ocular disease, sun protection, outdoor or indoor glare reduction, pattern sensitive epilepsy, migraines, reading difficulties or fashion. The remainder did not wear tinted spectacle lenses for any purpose other than sun protection. Tinted lens wear and no tinted lens wear groups were age and gender matched. There was no statistically significant difference in five global personality factors between the no-tint and tint groups: extraversion (p = 0.31), anxiety (p = 0.75), tough-mindedness (p = 0.96), independence (p = 0.63), and self-control (p = 0.87). This suggests that the use of tinted lenses by physically healthy people is unlikely to be an indicator of personality type. PMID:17324204

Eperjesi, F

2007-03-01

434

Realizing Physical Approximation of the Partial Transpose  

E-print Network

The partial transpose by which a subsystem's quantum state is solely transposed is of unique importance in quantum information processing from both fundamental and practical point of view. In this work, we present a practical scheme to realize a physical approximation to the partial transpose using local measurements on individual quantum systems and classical communication. We then report its linear optical realization and show that the scheme works with no dependence on local basis of given quantum states. A proof-of-principle demonstration of entanglement detection using the physical approximation of the partial transpose is also reported.

Hyang-Tag Lim; Yong-Su Kim; Young-Sik Ra; Joonwoo Bae; Yoon-Ho Kim

2011-04-15

435

Method for partially coating laser diode facets  

NASA Technical Reports Server (NTRS)

Bars of integral laser diode devices cleaved from a wafer are placed with their p regions abutting and n regions abutting. A thin BeCu mask having alternate openings and strips of the same width as the end facets is used to mask the n region interfaces so that multiple bars can be partially coated over their exposed p regions with a reflective or partial reflective coating. The partial coating permits identification of the emitting facet from the fully coated back facet during a later device mounting procedure.

Dholakia, Anil R. (Inventor)

1990-01-01

436

Midwest Partial Differential Equations Conference: Abstracts  

E-print Network

Georg Dolzmann, "A 2D compressible membrane theory as a Gamma-limit of a ... on smooth and finite-valued energies to the case incompressible materials. ... any two partial derivatives on the (harmonic) Newtonian potential give rise to a ...

437

Speculative parallelization of partially parallel loops  

E-print Network

with even one cross- processor flow dependence because we have to re-execute sequentially. Moreover, the existing, partial parallelism of loops is not exploited. We demonstrate a generalization of the speculative doall parallelization tech- nique, called...

Dang, Francis Hoai Dinh

2009-05-15

438

Partially quenched QCD and staggered fermions  

E-print Network

We summarize results for partially quenched chiral perturbation theory and indicate an application to staggered fermion QCD in which the square root of the determinant is taken to reduce the number of flavors from four to two.

C. Bernard; M. Golterman

1993-12-01

439

Preconditioning techniques for stochastic partial differential equations  

E-print Network

This thesis is about preconditioning techniques for time dependent stochastic Partial Differential Equations arising in the broader context of Uncertainty Quantification. State-of-the-art methods for an efficient integration ...

Spantini, Alessio

2013-01-01

440

Color Discriminability for Partially Seeing Children  

ERIC Educational Resources Information Center

Investigated was whether partially seeing children see the Snellen E, printed in selected colored inks on various colored backgrounds, at different distances in terms of initial recognition and best focus. (Author)

Myers, William A.

1971-01-01