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Sample records for dental articulators

  1. The use of articulators in UK dental schools.

    PubMed

    Hindle, J R; Craddock, H L

    2006-11-01

    The increasing complexity of many restorative procedures often involves articulation of study and working casts to ensure accurate fabrication of restorations. Correct selection and use of articulators can be crucial to successful restoration. The aim of this paper is to determine which articulators are recommended for various restorative procedures in UK dental schools, for use by undergraduate students. A questionnaire-based study of all UK dental schools was carried out, with a 100% response rate. Recommended articulator application for specified procedures was established from the literature and questionnaire results were compared with this. The results indicated that dental schools in the UK generally teach appropriate articulator use for most procedures. However, there are some limited areas of what may be argued to be inappropriate recommendation in some establishments.

  2. Virtual articulator for the analysis of dental occlusion: an update.

    PubMed

    Maestre-Ferrín, Laura; Romero-Millán, Javier; Peñarrocha-Oltra, David; Peñarrocha-Diago, María

    2012-01-01

    The future of dental practice is closely linked to the utilization of computer-based technology, specifically virtual reality, which allows the dental surgeon to simulate true life situations in patients. The virtual articulator has been designed for the exhaustive analysis of static and dynamic occlusion, with the purpose of substituting mechanical articulators and avoiding their errors. These tools will help both odontologists and dental prosthetists to provide the best individualized treatment for each patient. The present review analyzes the studies published in the literature on the design, functioning and applications of virtual articulators. A Medline-PubMed search was made of dental journals, with the identification of 137 articles, of which 16 were finally selected. The virtual articulator can simulate the specific masticatory movement of the patient. During mandibular animation, the program calculates the sites where the opposing teeth come into contact. The studies made to assess the reliability of the virtual articulator show good correspondence in visualization of the number and position of the dynamic contacts. The virtual articulator is a precise tool for the full analysis of occlusion in a real patient.

  3. Articulated dental cast analysis of asymptomatic and symptomatic populations.

    PubMed

    Cordray, Frank E

    2016-06-30

    Dental instrumentation has long provided insight into the mechanism of musculo-skeletal function of the gnathic system. While large population studies associate dental arch displacement (DAD), especially laterally, with symptoms, mandibular condyle displacement (CD) resulting from DAD has not been targeted as possibly etiologic in the production of common muscle contraction headache (CMCH) and temporo-mandibular dysfunction (TMD). The objective was to evaluate the three-dimensional nature of DAD and CD between the seated condylar position (SCP) and the intercuspal position (ICP) and to compare results derived from large deprogrammed asymptomatic and symptomatic populations. A total of 1 192 sets of dental casts collected from asymptomatic and symptomatic populations were articulated in the SCP. The initial occlusal contact, DAD, and condylar displacement were evaluated for frequency, direction, and magnitude of displacement between the SCP and ICP. The data revealed significant displacement between the SCP and ICP of the condyles (displaced most frequently inferior (down) and posterior (distal)) and substantially increased frequency and magnitude of displacement of the dental arches (with posterior premature occlusal contacts, increased overjet, decreased overbite, midline differences, and occlusal classification changes) in symptomatic subjects. These discrepancies were statistically significant and clinically significant. The data support the concept of increased DAD and CD with dysfunction. Transverse condylar displacement, commonly presenting with dental cross bite, may be associated with CMCH and TMD. Displacement of the mandibular condyle may be an etiologic factor in CMCH and dysfunction of the temporo-mandibular joint.

  4. Articulated dental cast analysis of asymptomatic and symptomatic populations

    PubMed Central

    Cordray, Frank E

    2016-01-01

    Dental instrumentation has long provided insight into the mechanism of musculo-skeletal function of the gnathic system. While large population studies associate dental arch displacement (DAD), especially laterally, with symptoms, mandibular condyle displacement (CD) resulting from DAD has not been targeted as possibly etiologic in the production of common muscle contraction headache (CMCH) and temporo-mandibular dysfunction (TMD). The objective was to evaluate the three-dimensional nature of DAD and CD between the seated condylar position (SCP) and the intercuspal position (ICP) and to compare results derived from large deprogrammed asymptomatic and symptomatic populations. A total of 1 192 sets of dental casts collected from asymptomatic and symptomatic populations were articulated in the SCP. The initial occlusal contact, DAD, and condylar displacement were evaluated for frequency, direction, and magnitude of displacement between the SCP and ICP. The data revealed significant displacement between the SCP and ICP of the condyles (displaced most frequently inferior (down) and posterior (distal)) and substantially increased frequency and magnitude of displacement of the dental arches (with posterior premature occlusal contacts, increased overjet, decreased overbite, midline differences, and occlusal classification changes) in symptomatic subjects. These discrepancies were statistically significant and clinically significant. The data support the concept of increased DAD and CD with dysfunction. Transverse condylar displacement, commonly presenting with dental cross bite, may be associated with CMCH and TMD. Displacement of the mandibular condyle may be an etiologic factor in CMCH and dysfunction of the temporo-mandibular joint. PMID:27357324

  5. Articulated dental cast analysis of asymptomatic and symptomatic populations.

    PubMed

    Cordray, Frank E

    2016-01-01

    Dental instrumentation has long provided insight into the mechanism of musculo-skeletal function of the gnathic system. While large population studies associate dental arch displacement (DAD), especially laterally, with symptoms, mandibular condyle displacement (CD) resulting from DAD has not been targeted as possibly etiologic in the production of common muscle contraction headache (CMCH) and temporo-mandibular dysfunction (TMD). The objective was to evaluate the three-dimensional nature of DAD and CD between the seated condylar position (SCP) and the intercuspal position (ICP) and to compare results derived from large deprogrammed asymptomatic and symptomatic populations. A total of 1 192 sets of dental casts collected from asymptomatic and symptomatic populations were articulated in the SCP. The initial occlusal contact, DAD, and condylar displacement were evaluated for frequency, direction, and magnitude of displacement between the SCP and ICP. The data revealed significant displacement between the SCP and ICP of the condyles (displaced most frequently inferior (down) and posterior (distal)) and substantially increased frequency and magnitude of displacement of the dental arches (with posterior premature occlusal contacts, increased overjet, decreased overbite, midline differences, and occlusal classification changes) in symptomatic subjects. These discrepancies were statistically significant and clinically significant. The data support the concept of increased DAD and CD with dysfunction. Transverse condylar displacement, commonly presenting with dental cross bite, may be associated with CMCH and TMD. Displacement of the mandibular condyle may be an etiologic factor in CMCH and dysfunction of the temporo-mandibular joint. PMID:27357324

  6. In Vitro Evaluation of New Approach to Digital Dental Model Articulation

    PubMed Central

    Chang, Yu-Bing; Xia, James J.; Gateno, Jaime; Xiong, Zixiang; Teichgraeber, John F.; Lasky, Robert E.; Zhou, Xiaobo

    2015-01-01

    Purpose The purpose of the present study was to evaluate the accuracy of our newly developed approach to digital dental model articulation. Materials and Methods Twelve sets of stone dental models from patients with craniomaxillofacial deformities were used for validation. All the models had stable occlusion and no evidence of early contact. The stone models were hand articulated to the maximal intercuspation (MI) position and scanned using a 3-dimensional surface laser scanner. These digital dental models at the MI position served as the control group. To establish an experimental group, each mandibular dental model was disarticulated from its original MI position to 80 initial positions. Using a regular office personal computer, they were digitally articulated to the MI position using our newly developed approach. These rearticulated mandibular models served as the experimental group. Finally, the translational, rotational, and surface deviations in the mandibular position were calculated between the experimental and control groups, and statistical analyses were performed. Results All the digital dental models were successfully articulated. Between the control and experimental groups, the largest translational difference in mandibular position was within 0.2 mm ± 0.6 mm. The largest rotational difference was within 0.1° ± 1.1°. The averaged surface deviation was 0.08 ± 0.07. The results of the Bland and Altman method of assessing measurement agreement showed tight limits for the translational, rotational, and surface deviations. In addition, the final positions of the mandibular articulated from the 80 initial positions were absolutely agreed on. Conclusion The results of our study have demonstrated that using our approach, the digital dental models can be accurately and effectively articulated to the MI position. In addition, the 3-dimensional surface geometry of the mandibular teeth played a more important role in digital dental articulation than the

  7. An Articulation Model in Dental Assisting for the Commonwealth of Pennsylvania. A Continuation.

    ERIC Educational Resources Information Center

    Sylves, Jane M.; Boody, Sandra

    A curriculum development project was conducted to generate additional competency-based modules to be used within the articulation model for Pennsylvania dental assisting programs, established in 1988. Project activities included reviewing, modifying, and providing parallel competency-based structure for the courses at the A.W. Beattie Technical…

  8. Effect of different dental articulating papers on SEMG activity during maximum clenching.

    PubMed

    Augusti, Davide; Augusti, Gabriele; Re, Dino; Dellavia, Claudia; Giannì, Aldo Bruno

    2015-08-01

    This study evaluated the influence of two different occlusal indicators (articulating papers of 40μm and 200μm) on muscular activity of the temporalis anterior (TA) and superficial masseter (MS) during maximum voluntary clenches (MVC), using surface electromyography (SEMG). It was hypothesized that an articulating paper positioned between dental arches during MVC elicits a different muscular activity compared with the occlusion on natural dentition (without the occlusal indicator). 30 healthy adult subjects with a complete, natural dentition were recruited; SEMG activity was recorded in the following experimental conditions: MVC with cotton rolls for standardization purposes; MVC on natural dentition; MVC onto the 40μm or 200μm paper indicator positioned on right or left side of the dental arch. Percentage Overlapping Coefficient (POC; separate values obtained for TA and MS), antero-posterior coefficient (APC) and total muscle activities (IMP) were the analyzed SEMG parameters. The use of an occlusal indicator statistically changed POC_TA, POC_MS and IMP median values (p<0.05). Both 40μm and 200μm occlusal papers did not significantly affect APC values (P=0.86). A pronounced asymmetric muscular activity has been recorded with the introduction of an interocclusal media. All indices of muscular activity did not differ between sexes (Kruskal Wallis test, P>0.05). In conclusion, the examined articulating papers affected two specific SEMG parameters (POC and IMP); the recorded muscular activity with the occlusal indicator varied regardless left or right side positioning, and independently from tested paper thicknesses.

  9. Impact of arbitrary and mean transfer of dental casts to the articulator on centric occlusal errors.

    PubMed

    Morneburg, Thomas R; Pröschel, Peter A

    2011-06-01

    When fabricating dental restorations, casts are usually transferred to the articulator based on arbitrary hinge axes or mean values instead of true hinge axis points. Using arbitrary hinge axis points or mean values can lead to occlusal errors if the vertical relation is changed in the articulator (e.g., when a centric record is used). This study predicted the probability of occlusal errors occurring in a group of subjects when casts are mounted based on arbitrary hinge axis points or mean values. In 57 healthy volunteers, true hinge axis points, arbitrary hinge axis points, right infraorbital point, maxillary incisal point, and the palatal cusps of the second molars were determined. Mean hinge axis points were established based on Balkwill angles between 17° and 25°. Occlusal errors evoked by cast mounting in relation to arbitrary or mean axes compared to true hinge axes were calculated. Errors were determined for vertical relation settings of 2 and 4 mm. With 2 mm vertical relation, occlusal errors ≥340 µm occurred with a 10% probability with arbitrary hinge axis mounting. At the same probability level, the error increased moderately to ≥440 µm with mean value mounting and a Balkwill angle of 17°. With a Balkwill angle of 25° occlusal errors ≥1,120 µm occurred with 10% probability. Occlusal errors increased considerably with a vertical relation setting of 4 mm. If vertical relation shall be altered, a transfer of the casts according to arbitrary hinge axes is recommended. If casts are transferred according to mean values, errors are bigger depending on the articulator used.

  10. Changes in Finnish dental consonant articulation in cleft lip/palate children between 6 and 8 years of age.

    PubMed

    Laitinen, J; Ranta, R; Pulkkinen, J; Paaso, M; Haapanen, M L

    2000-01-01

    The aim of this study was to clarify changes in the occurrence of misarticulations of dental consonants /r/, /s/ and /l/ between 6 and 8 years of age in cleft-affected Finnish children and to compare the effects of gender and to estimate if spacing due to changing of maxillary incisors could explain changes in articulation of these sounds. The subjects were 133 (47 girls, 86 boys) Finnish-speaking non-syndromic children with isolated cleft palate (n = 34), cleft lip/alveolus (n = 49), unilateral (n = 33), and bilateral (n = 17) cleft lip and palate. The results showed that there were no statistically significant differences between genders according to changes in articulation abilities by the age of 8 years. Eighty-one percent of the subjects with misarticulations at the age of 6 years still misarticulated at 8 years of age, and 16% of the subjects without misarticulations at the age of 6 years misarticulated at the age of 8 years; /s/ and /l/ misarticulations were eliminated more often than /r/ errors. New misarticulations were diagnosed at the age of 8 years in the same way in the groups with (14%) and without (16%) misarticulations at the age of 6 years. Dental arch spacing due to changing of maxillary incisors does not seem to explain new misarticulations of /r/, /s/ and /l/ sounds estimated at the age of 8 years.

  11. The articulator: a diagnostic instrument.

    PubMed

    Millstein, Philip L

    2002-01-01

    The success of dental restorations depends on how we view the existing occlusion. Clinicians may be confounded with what aspects of the occlusion will contribute to the success of a restoration. This information can be reviewed with the dental laboratory when it is stored in a dental articulator in the form of dental casts with simulated movements.

  12. Occlusion: 3. Articulators and related instruments.

    PubMed

    Milosevic, Alex

    2003-11-01

    Dental articulators are instruments that reproduce jaw movements to varying degrees of accuracy. This article aims to give an overview of the various types of articulator and describe their applications and limitations.

  13. Waveguide and articulated arm for Er:YAG laser system: shape and depth of laser cavity in hard dental tissues

    NASA Astrophysics Data System (ADS)

    Jelinkova, Helena; Dostalova, Tatjana; Miyagi, Mitsunobu; Wang, You; Shi, Yi-Wei; Dolezalova, Libuse; Hamal, Karel; Krejsa, Otakar; Kubelka, Jiri; Prochazka, Stanislav

    1998-04-01

    The aim of our study was to verify the efficiency of delivery systems for Er:YAG laser radiation which could be used in dentistry. The influence of increasing energy and number of pulses on a profile and depth of drilled holes was investigated. Er:YAG laser was operating in a free-running mode, generating a length of pulses 200 microsecond with a maximum energy of 500 mJ. The delivery systems investigated were an articulated arm and a fluorocarbon polymer-coated silver hollow glass waveguide. The prepared hard tissues were a sliced part of enamel, dentine and ivory. The laser radiation was directed on them by focusing optics (CaF2 lens) together with the cooling water to ensure that the tissues will not be burned. For the evaluation of shapes, depth and profiles of the prepared cavities the metallographic microscope, x-ray microtomograph and scanning electron microscope were used. From the results it was observed that the profile and depth of the cavities prepared by the laser radiation delivered by the various systems (waveguide or articulated arm) are not the same. The laser radiation delivered by waveguide produces a larger diameter cavity with a lower depth. The holes are smoother and without side effects.

  14. 21 CFR 872.6140 - Articulation paper.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 8 2011-04-01 2011-04-01 false Articulation paper. 872.6140 Section 872.6140 Food... DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6140 Articulation paper. (a) Identification. Articulation paper is a device composed of paper coated with an ink dye intended to be placed between...

  15. 21 CFR 872.3150 - Articulator.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 8 2011-04-01 2011-04-01 false Articulator. 872.3150 Section 872.3150 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3150 Articulator. (a) Identification. An articulator is...

  16. 21 CFR 872.3150 - Articulator.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Articulator. 872.3150 Section 872.3150 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3150 Articulator. (a) Identification. An articulator is...

  17. 21 CFR 872.6140 - Articulation paper.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Articulation paper. 872.6140 Section 872.6140 Food... DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6140 Articulation paper. (a) Identification. Articulation paper is a device composed of paper coated with an ink dye intended to be placed between...

  18. 21 CFR 872.6140 - Articulation paper.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 21 Food and Drugs 8 2013-04-01 2013-04-01 false Articulation paper. 872.6140 Section 872.6140 Food... DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6140 Articulation paper. (a) Identification. Articulation paper is a device composed of paper coated with an ink dye intended to be placed between...

  19. 21 CFR 872.6140 - Articulation paper.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 8 2014-04-01 2014-04-01 false Articulation paper. 872.6140 Section 872.6140 Food... DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6140 Articulation paper. (a) Identification. Articulation paper is a device composed of paper coated with an ink dye intended to be placed between...

  20. 21 CFR 872.6140 - Articulation paper.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 21 Food and Drugs 8 2012-04-01 2012-04-01 false Articulation paper. 872.6140 Section 872.6140 Food... DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6140 Articulation paper. (a) Identification. Articulation paper is a device composed of paper coated with an ink dye intended to be placed between...

  1. Face bow and articulator for planning orthognathic surgery: 2 articulator.

    PubMed

    Walker, Fraser; Ayoub, Ashraf F; Moos, Khursheed F; Barbenel, Joseph

    2008-10-01

    Patients who require orthognathic surgery may have asymmetry of the position of the temporomandibular joints relative to the maxilla, which is impossible to reproduce on the current semiadjustable articulators used for surgical planning. We describe a highly-adjustable spirit level orthognathic face bow that allows records to be made of patients with asymmetrical maxillae. The orthognathic articulator also allows the position of the condylar components of the articulator to be adjusted in three dimensions. The use of the new face bow and articulator made it possible to mount the dental casts of asymmetrical faces to reproduce their clinical appearance. The devices were evaluated by comparing the measurements of anatomical variables obtained from cephalometric radiographs with equivalent values obtained from the orthognathic articulator and casts mounted on the articulator. Although the measurements showed significant intersubject variability, the angle between the horizontal and maxillary occlusal plane, occlusal cant angle, and intercondylar widths, were not significantly different.

  2. Advancing Health Promotion in Dentistry: Articulating an Integrative Approach to Coaching Oral Health Behavior Change in the Dental Setting

    PubMed Central

    Howard, Anita R.

    2015-01-01

    Oral health is managed based on objective measures such as the presence and severity of dental caries and periodontal disease. In recent years, oral health researchers and practitioners have shown increasing interest in a widened array of physical, psychological, and social factors found to influence patients’ oral health. In this article, we introduce a behavior change coaching approach that can be used to enhance psychosocial diagnosis and client-centered delivery of health-promoting interventions. Briefly, this health coaching approach is based on an interactive assessment (both physical and psychological), a non-judgmental exploration of patients’ knowledge, attitudes, and beliefs, a mapping of patient behaviors that may contribute to disease progression, gauging patient motivation, and tailoring health communication to encourage health-promoting behavior change. Developed in a clinical setting, this coaching model is supported by interdisciplinary theory, research, and practice on health behavior change. We suggest that, with supervision, this coaching process may be learned. PMID:26457237

  3. The virtual articulator.

    PubMed

    Bisler, A; Bockholt, U; Kordass, B; Suchan, M; Voss, G

    2002-01-01

    The virtual articulator (VA) is intended for use as a tool for the analysis fo the complex static and dynamic occlusal relations. Its chief application is in individual diagnosis and the simulation of the mechanical articulator. As entry data, the VA requires digital, 3-dimensional representations of the jaws and patient-specific data on jaw movement. It then simulates jaw movement and provides a dynamic visualization of the occlusal contacts. If no patient-specific data are available, the modus operandi of the mechanical articulator can be simulated. Virtual reality (VR) techniques applied in computer-aided diagnosis are revolutionizing medical routine in many disciplines. Particularly in the field of dental engineering, VR combined with CAD/CAM technology has great potential in implant planning and design in terms of greater precision and shorter treatment duration. The geometry of teeth can be digitized, the implant models can be designed with specialized CAD systems, and the final implants can be manufactured with a CNC machine. In this context, the virtual articulator completes the digital manufacturing process.

  4. Intersegmental Articulation.

    ERIC Educational Resources Information Center

    CATESOL Journal, 1996

    1996-01-01

    This English-as-a-Second Language (ESL) journal periodically devotes entire issues to specific themes. The theme of this issue is "Intersegmental Articulation" (especially in California schools). Articles include: "Why Is ESL a Burning Issue?" (Robby Ching, Anne Ediger, Debbie Poole); "Challenges Facing California ESL Students and Teachers across…

  5. Dental Training Films.

    ERIC Educational Resources Information Center

    Veterans Administration Medical Center, Washington, DC.

    This dental training films catalog is organized into two sections. Section I is a category listing of the films by number and title, indexed according to generalized headings; categories are as follow: anatomy, articulator systems, complete dentures, dental assisting, dental laboratory technology, dental materials, dental office emergencies,…

  6. The Role of Virtual Articulator in Prosthetic and Restorative Dentistry

    PubMed Central

    Aljanakh, Mohammad

    2014-01-01

    Virtual reality is a computer based technology linked with the future of dentistry and dental practice. The virtual articulator is one such application in prosthetic and restorative dentistry based on virtual reality that will significantly reduce the limitations of the mechanical articulator, and by simulation of real patient data, allow analyses with regard to static and dynamic occlusion as well as to jaw relation. It is the purpose of this article to present the concepts and strategies for a future replacement of the mechanical articulator by a virtual one. Also, a brief note on virtual reality haptic system has been highlighted along with newly developed touch enabled virtual articulator. PMID:25177664

  7. The role of virtual articulator in prosthetic and restorative dentistry.

    PubMed

    Koralakunte, Pavankumar Ravi; Aljanakh, Mohammad

    2014-07-01

    Virtual reality is a computer based technology linked with the future of dentistry and dental practice. The virtual articulator is one such application in prosthetic and restorative dentistry based on virtual reality that will significantly reduce the limitations of the mechanical articulator, and by simulation of real patient data, allow analyses with regard to static and dynamic occlusion as well as to jaw relation. It is the purpose of this article to present the concepts and strategies for a future replacement of the mechanical articulator by a virtual one. Also, a brief note on virtual reality haptic system has been highlighted along with newly developed touch enabled virtual articulator.

  8. Articulating feedstock delivery device

    DOEpatents

    Jordan, Kevin

    2013-11-05

    A fully articulable feedstock delivery device that is designed to operate at pressure and temperature extremes. The device incorporates an articulating ball assembly which allows for more accurate delivery of the feedstock to a target location. The device is suitable for a variety of applications including, but not limited to, delivery of feedstock to a high-pressure reaction chamber or process zone.

  9. Functional occlusion: II. The role of articulators in orthodontics.

    PubMed

    Clark, J R; Hutchinson, I; Sandy, J R

    2001-06-01

    Opinion is divided on whether there is a place for the use of semi-adjustable dental articulators in orthodontics. In this review we explore the validity and reproducibility of the techniques involved in mounting study models on a semi-adjustable dental articulator. We also look at the role of articulated study models in orthodontic diagnosis and treatment planning, in the finishing stages of orthodontics and in planning for orthognathic surgery. We report that each of the many stages involved in mounting study models on a semi-adjustable articulator is a potential source of error and that only if the technique is carried out with a high degree of accuracy is it worth the additional chairside time.

  10. Bilateral balanced articulation: science or dogma?

    PubMed

    Farias-Neto, Arcelino; Carreiro, Adriana da Fonte Porto

    2014-06-01

    For more than a hundred years, it has been supposed that canine guidance should be avoided in conventional complete dentures, since it would result in denture instability. Thus, bilateral balanced articulation has been held by many authors as fundamental for treatment success. However, randomized clinical trials have shown that balanced articulation is not as important as previously thought. The issue about which occlusal concept is the most appropriate for individual needs is clinically and economically relevant for both the dentist and dental technician. Therefore, the purpose of this study is to provide an evidence-based update on complete denture occlusion. Clinical Relevance: The issue about which occlusal concept is the most appropriate for individual needs is clinically and economically relevant. PMID:25073224

  11. Articulating Business Education Curricula.

    ERIC Educational Resources Information Center

    McEwen, Beryl C.

    1998-01-01

    Responses from 75 of 108 business educators indicated that most students took business courses to develop both job and personal-use skills; more than 50% were college bound. A substantial overlap between skills taught in secondary and postsecondary business shows a strong possibility for curriculum articulation. (SK)

  12. Articulation Costing. Phase II

    ERIC Educational Resources Information Center

    British Columbia Council on Admissions and Transfer, 2004

    2004-01-01

    Within the British Columbia post-secondary system, significant numbers of students transfer among colleges, institutes, universities and university colleges. These transfers may be handled individually student by student or through a set of articulation agreements administered and facilitated by the British Columbia Council on Admissions and…

  13. Articulation in Education.

    ERIC Educational Resources Information Center

    Buffer, Loretta C.; And Others

    One of a series of papers on critical issues in vocational-technical education, this paper discusses problems and possible solutions to the need for special consideration of individual needs as students migrate within and between educational programs. Articulation is required so that students may move from program to program, or from institution…

  14. Motor coordination of articulators depends on the place of articulation.

    PubMed

    Inoue-Arai, Maristela Sayuri; Ono, Takashi; Honda, Ei-ichi; Kurabayashi, Tohru; Moriyama, Keiji

    2009-05-16

    Although the sounds/p/and/k/are both voiceless plosives, they have different places of articulation: bilabial and velar, respectively. The purpose of this study was to determine the relationship among articulators in plosives with reference to their place of articulation. Ten healthy subjects repeated bilabial and velar plosives in synchronization with magnetic resonance scanning. Each run was measured using a gradient echo sequence. Several linear and angular variables were defined to delineate the individual movements of articulators and to determine the temporal relationships among articulators. These variables showed distinctive changes depending on the place of articulation. In addition, movement of the velum was significantly correlated with that of the lips and the anterior part of the tongue in the bilabial plosive and with the posterior part of the tongue in the velar plosive. We conclude that unitary motor coordination of articulators depends on the place of articulation. PMID:19126418

  15. Evaluation of an improved orthognathic articulator system: 1. Accuracy of cast orientation.

    PubMed

    Paul, P E; Barbenel, J C; Walker, F S; Khambay, B S; Moos, K F; Ayoub, A F

    2012-02-01

    A systematic study was carried out using plastic model skulls to quantify the accuracy of the transfer of face bow registration to the articulator. A standard Dentatus semi-adjustable articulator system was compared to a purpose built orthognathic articulator system by measuring the maxillary occlusal plane angles of plastic model skulls and of dental casts mounted on the two different types of articulators. There was a statistically significant difference between the two systems; the orthognathic system showed small random errors, but the standard system showed systematic errors of up to 28°.

  16. Improved digital transfer of the maxillary cast to a virtual articulator.

    PubMed

    Solaberrieta, Eneko; Otegi, Jose Ramon; Mínguez, Rikardo; Etxaniz, Olatz

    2014-10-01

    The clinical procedure described provides a quantifiable, repeatable, and reliable method of transferring the location of the maxillary dental arch from the patient directly to a virtual articulator (virtual facebow transfer) by means of reverse engineering devices to design a customized dental restoration. This procedure allows the dentist and the dental laboratory technician to work in a fully digital environment without having to mount stone casts on a mechanical articulator. In addition, specific suggestions are provided for designing the transfer device to enhance patient comfort during the data transfer process and reduce deviation.

  17. Intelligent Articulated Robot

    NASA Astrophysics Data System (ADS)

    Nyein, Aung Kyaw; Thu, Theint Theint

    2008-10-01

    In this paper, an articulated type of industrial used robot is discussed. The robot is mainly intended to be used in pick and place operation. It will sense the object at the specified place and move it to a desired location. A peripheral interface controller (PIC16F84A) is used as the main controller of the robot. Infrared LED and IR receiver unit for object detection and 4-bit bidirectional universal shift registers (74LS194) and high current and high voltage Darlington transistors arrays (ULN2003) for driving the arms' motors are used in this robot. The amount of rotation for each arm is regulated by the limit switches. The operation of the robot is very simple but it has the ability of to overcome resetting position after power failure. It can continue its work from the last position before the power is failed without needing to come back to home position.

  18. The psychoacoustics of musical articulation

    NASA Astrophysics Data System (ADS)

    Spiegelberg, Scott Charles

    This dissertation develops psychoacoustical definitions of notated articulations, the necessary first step in articulation research. This research can be useful to theorists interested in timbre analysis, the psychology of performance, analysis and performance, the psychology of style differentiation, and performance pedagogy. An explanation of wavelet transforms precedes the development of new techniques for analyzing transient sounds. A history of timbre perception research reveals the inadequacies of current sound segmentation models, resulting in the creation of a new model, the Pitch/Amplitude/Centroid Trajectory (PACT) model of sound segmentation. The new analysis techniques and PACT model are used to analyze recordings of performers playing a melodic fragment in a series of notated articulations. Statistical tests showed that the performers generally agreed on the interpretation of five different articulation groups. A cognitive test of articulation similarity, using musicians and non-musicians as participants, revealed a close correlation between similarity judgments and physical attributes, though additional unknown factors are clearly present. A second psychological test explored the perceptual salience of articulation notation, by asking musically-trained participants to match stimuli to the same notations the performers used. The participants also marked verbal descriptors for each articulation, such as short/long, sharp/dull, loud/soft, harsh/gentle, and normal/extreme. These results were matched against the results of Chapters Five and Six, providing an overall interpretation of the psychoacoustics of articulation.

  19. Articulation Telecommunication Project 1998 Report.

    ERIC Educational Resources Information Center

    British Columbia Council on Admissions and Transfer, Vancouver.

    The Articulation Committee Telecommunication project was undertaken to assess how communications technologies are currently being used to facilitate articulation committee business across the province of British Columbia (BC). The project provided an opportunity to determine the level of use of communications technologies such as e-mail, list…

  20. Your Students: Global or Articulated?

    ERIC Educational Resources Information Center

    Judd, Wallace P.

    1973-01-01

    This article discusses the psychological concept of differentiation,'' its two extremes (global and articulated), and the effects this trait can have on a child's education (articulated children break down their environment into functional and perceptual components while the global person does not change the framework of his perceptions). (JA)

  1. Articulating Success in West Virginia

    ERIC Educational Resources Information Center

    D'Antoni, Kathy J.; Coulson, Gene

    2008-01-01

    Two years in West Virginia, college filing cabinets were stacked high with articulation agreements. College faculty members were traveling to and from area high schools in an effort to develop and finalize articulation agreements; all part of the process. And to what end? Less than 1 percent of students in the state were taking advantage of the…

  2. A newer approach in positioning teeth for dental prosthetics using lateral cephalometric, trans-cranial radiographs, and the Denar-Witzig articulator: a case of hypodontia in an adolescent patient.

    PubMed

    Chapra, A; White, G E

    2001-01-01

    Traditionally in full denture prosthetics, anterior teeth are set on the models, independent of the effects on the face. More enlightened dentists, will then adjust the wax-up for speech, and some effects on the lips. Consideration is infrequently given to restoring the face by repositioning the teeth and mandible. Rarely is thought given to the effects of occlusion on the posture of the body. This report uses several techniques to restore facial esthetics and body posture. The techniques used include a cephalometric radiograph, transcranial radiographs, an articulator that has an adjustable "TMJ" (Denar-Witzig), and Symmetrigraf Posture Chart. This clinical report describes a newer approach in the positioning of maxillary anterior teeth for a patient with hypodontia and nail dysplasia syndrome, and the overall effect of this approach on the face and posture of the patient. Conventionally the precise form of the maxillary wax rim is fabricated with considerable variation from technician to another, based on the technicians training. This variation is evident on the position of the labial aspect of the rim horizontally and vertically. The wax rim is then further adjusted chair side based on subjective evaluation of the face. The maxillary anterior teeth position is established without considering that the lip position is not yet accustomed to the wax rim.

  3. Direct transfer of the position of digitized casts to a virtual articulator.

    PubMed

    Solaberrieta, Eneko; Mínguez, Rikardo; Barrenetxea, Lander; Etxaniz, Olatz

    2013-06-01

    This article describes a digital technique to transfer the location of digitized casts obtained directly from the patient to a virtual articulator (digital/virtual facebow transfer). The primary advantage of this technique is that it allows the dentist and the dental laboratory technician to work in a fully digital environment without having to mount stone casts on a physical articulator. This results in a significant time reduction and a higher degree of accuracy in the cast location.

  4. Improving the digital workflow: direct transfer from patient to virtual articulator.

    PubMed

    Solaberrieta, Eneko; Minguez, Rikardo; Etxaniz, Olatz; Barrenetxea, Lander

    2013-01-01

    When designing a custom-made dental restoration, using a digital workflow represents an important advance over mechanical tools such as facebows or mechanical articulators. When using virtual scanning procedures, there is a direct transfer from the patient to the articulator. This paper presents a novel methodology to design custom-made restorations. This new approach permits the transfer of all data directly from the patient to the virtual articulator, always taking into account the kinematics of the mandible. Rapid further developments can be expected in the near future.

  5. Dental Amalgam

    MedlinePlus

    ... Products and Medical Procedures Dental Devices Dental Amalgam Dental Amalgam Share Tweet Linkedin Pin it More sharing options Linkedin Pin it Email Print Dental amalgam is a dental filling material which is ...

  6. Articulation Agreements Ease the Way.

    ERIC Educational Resources Information Center

    Reese, Susan

    2002-01-01

    Articulation agreements between secondary and postsecondary institutions often provide for granting college credit for course work completed at another institution. They have been described as programs designed to create pathways of learning that ease the transition of students from secondary to postsecondary levels. (JOW)

  7. Fluid simulation with articulated bodies.

    PubMed

    Kwatra, Nipun; Wojtan, Chris; Carlson, Mark; Essa, Irfan; Mucha, Peter J; Turk, Greg

    2010-01-01

    We present an algorithm for creating realistic animations of characters that are swimming through fluids. Our approach combines dynamic simulation with data-driven kinematic motions (motion capture data) to produce realistic animation in a fluid. The interaction of the articulated body with the fluid is performed by incorporating joint constraints with rigid animation and by extending a solid/fluid coupling method to handle articulated chains. Our solver takes as input the current state of the simulation and calculates the angular and linear accelerations of the connected bodies needed to match a particular motion sequence for the articulated body. These accelerations are used to estimate the forces and torques that are then applied to each joint. Based on this approach, we demonstrate simulated swimming results for a variety of different strokes, including crawl, backstroke, breaststroke, and butterfly. The ability to have articulated bodies interact with fluids also allows us to generate simulations of simple water creatures that are driven by simple controllers. PMID:19910662

  8. Transforming Articulation Barriers in Nursing.

    ERIC Educational Resources Information Center

    Waters, Verle

    Barriers to educational mobility for nurses have existed since the mid-1960s. In 1963, the National League for Nursing (NLN) adopted a position that ruled out articulation of any kind between associate degree in nursing (ADN) and bachelors in science in nursing (BSN) programs. In the mid-1970s, a countermovement took shape, supporting open…

  9. LST secondary mirror articulation mechanism

    NASA Technical Reports Server (NTRS)

    1974-01-01

    The analysis, design, manufacture, test, and delivery of one secondary mirror articulation mechanism for the large space telescope (LST) are reported. The mechanism provides angular freedom about two axes that are perpendicular to the optical axis of the secondary mirror. Motion in each axis is controlled from two sources; one source provides alignment, the other source provides stabilization. Two articulation mechanism configurations were evaluated. In one configuration the stabilization system was assembled with piezoelectric actuators. In the second configuration the stabilization system utilized flexure torque motor actuators. The alignment system was the same for both configurations. System testing confirmed performance that met or exceeded all operational requirements. The two types of stabilization actuators had different performance characteristics. Both types demonstrated position resolution and frequency response better than specified limits.

  10. Boom and chassis articulation joints

    NASA Technical Reports Server (NTRS)

    Murphy, Joel T., Jr.; Nguyen, Vien; Turner, Bonnie; Wheeler, Bobby; Williams, Kimberlyn

    1992-01-01

    The primary goal of our design project was to develop articulation joints for the chassis and boom of the proof-of-concept lunar vehicle. This is an ongoing project and the work of previous student groups was extensively reviewed. Some of the ideas generated are variations of past proposals. Although the project is funded by NASA/USRA, it is totally a student design effort.

  11. Illinois Articulation Initiative in Nursing Education.

    ERIC Educational Resources Information Center

    Illinois State Board of Higher Education, Springfield.

    As part of the statewide Illinois Articulation Initiative, a panel was formed in October 1993 to develop a model articulated nursing curriculum and minimum nursing competencies. This report presents the findings, conclusions, and recommendations of the panel. Following a brief introduction, the history of articulation efforts and policies in…

  12. Articulation Visibility at Two-Year Colleges

    ERIC Educational Resources Information Center

    Fincher, Mark; Sharp, Lance; Burks, James; Lyon, Kelly; Parker, Mitchell; Ward, Justin; Hall, Ashia; Wilson, Vicki; Washington, Brittany

    2014-01-01

    Articulation between two-year colleges and universities provides a critical opportunity for potential students. Most institutions declare their support of articulation; however, the visibility of this support to potential students is inconsistent at best. Articulation agreements that are visible and easily understood by potential students serve as…

  13. Stimulus Picture Identification in Articulation Testing

    ERIC Educational Resources Information Center

    Mullen, Patricia A.; Whitehead, Robert L.

    1977-01-01

    Compared with 20 normal speaking and 20 articulation defective Ss (7 and 8 years old) was the percent of correct initial identification of stimulus pictures on the Goldman-Fristoe Test of Articulation with the percent correct identification on the Arizona Articulation Proficiency Scale. (Author/IM)

  14. Articulation in Prader-Willi Syndrome.

    ERIC Educational Resources Information Center

    Defloor, Truus; Van Borsel, John; Curfs, Leopold

    2002-01-01

    This study examined articulation in 13 Dutch individuals (ages 7-29, IQs 38-83) with Prader-Willi syndrome using a picture naming test with transcribed samples subjected to analyses for articulation errors. Results suggest that the impaired articulation found is a function of IQ and that with increasing age, phonological problems gradually resolve…

  15. Influence of Articulating Paper Thickness on Occlusal Contacts Registration: A Preliminary Report.

    PubMed

    Brizuela-Velasco, Aritza; Álvarez-Arenal, Ángel; Ellakuria-Echevarria, Joseba; del Río-Highsmith, Jaime; Santamaría-Arrieta, Gorka; Martín-Blanco, Nerea

    2015-01-01

    The objective of this preliminary study was to determine if the occlusal contact surface registered with an articulating paper during fixed prosthodontic treatment was contained within the area marked on a thicker articulating paper. This information would optimize any necessary occlusal adjustment of a prosthesis' veneering material. A convenience sample of 15 patients who were being treated with an implant-supported fixed singleunit dental prosthesis was selected. Occlusal registrations were obtained from each patient using 12-μm, 40-μm, 80-μm, and 200-μm articulating paper. Photographs of the occlusal registrations were obtained, and pixel measurements of the surfaces were taken and overlapped for comparison. The results showed that the thicker the articulating paper, the larger the occlusal contact area obtained. The differences were statistically significant. In all cases, the occlusal registrations obtained with the thinnest articulating paper were contained within the area marked on the thickest articulating paper. The results suggested that the use of thin articulating papers (12-μm or 40-μm) can avoid unnecessary grinding of veneering material or teeth during occlusal adjustment. PMID:26218017

  16. Influence of Articulating Paper Thickness on Occlusal Contacts Registration: A Preliminary Report.

    PubMed

    Brizuela-Velasco, Aritza; Álvarez-Arenal, Ángel; Ellakuria-Echevarria, Joseba; del Río-Highsmith, Jaime; Santamaría-Arrieta, Gorka; Martín-Blanco, Nerea

    2015-01-01

    The objective of this preliminary study was to determine if the occlusal contact surface registered with an articulating paper during fixed prosthodontic treatment was contained within the area marked on a thicker articulating paper. This information would optimize any necessary occlusal adjustment of a prosthesis' veneering material. A convenience sample of 15 patients who were being treated with an implant-supported fixed singleunit dental prosthesis was selected. Occlusal registrations were obtained from each patient using 12-μm, 40-μm, 80-μm, and 200-μm articulating paper. Photographs of the occlusal registrations were obtained, and pixel measurements of the surfaces were taken and overlapped for comparison. The results showed that the thicker the articulating paper, the larger the occlusal contact area obtained. The differences were statistically significant. In all cases, the occlusal registrations obtained with the thinnest articulating paper were contained within the area marked on the thickest articulating paper. The results suggested that the use of thin articulating papers (12-μm or 40-μm) can avoid unnecessary grinding of veneering material or teeth during occlusal adjustment.

  17. Lunar articulated remote transportation system

    NASA Technical Reports Server (NTRS)

    1990-01-01

    The students of the Florida A&M/Florida State University College of Engineering continued their design from 1988 to 1989 on a first generation lunar transportation vehicle for use on the surface of the Moon between the years 2010 and 2020. Attention is focused on specific design details on all components of the Lunar Articulated Remote Transportation System (Lunar ARTS). The Lunar ARTS will be a three-cart, six-wheeled articulated vehicle. Its purpose will be the transportation of astronauts and/or materials for excavation purposes at a short distance from the base (37.5 km). The power system includes fuel cells for both the primary system and the back-up system. The vehicle has the option of being operated in a manned or unmanned mode. The unmanned mode includes stereo imaging with signal processing for navigation. For manned missions the display console is a digital readout displayed on the inside of the astronaut's helmet. A microprocessor is also on board the vehicle. Other components of the vehicle include a double wishbone/flexible hemispherical wheel suspension; chassis; a steering system; motors; seat retraints; heat rejection systems; solar flare protection; dust protection; and meteoroid protection. A one-quarter scale dynamic model has been built to study the dynamic behavior of the vehicle. The dynamic model closely captures the mechanical and electrical details of the total design.

  18. Lunar articulated remote transportation system

    NASA Technical Reports Server (NTRS)

    Beech, Geoffrey; Conley, Gerald; Diaz, Claudine; Dimella, Timothy; Dodson, Pete; Hykin, Jeff; Richards, Byron; Richardson, Kroy; Shetzer, Christie; Vandyke, Melissa

    1990-01-01

    A first generation lunar transportation vehicle was designed for use on the surface of the Moon between the years 2010 and 2020. Attention is focussed on specific design details on all components of the Lunar Articulated Remote Transportation System (Lunar ARTS). The Lunar ARTS will be a three cart, six-wheeled articulated vehicle. It's purpose will be for the transportation of astronauts and/or materials for excavation purposes at a short distance from the base (37.5 kilometers). The power system includes fuel cells for both the primary system and the back-up system. The vehicle has the option of being operated in a manned or unmanned mode. The unmanned mode includes stereo imaging with signal processing for navigation. For manned missions the display console is a digital readout displayed on the inside of the asronaut's helmet. A microprocessor is also on board the vehicle. Other components of the vehicle include: a double wishbone/flexible hemispherical wheel suspension; chassis; a steering system; motors; seat restraints, heat rejection systems; solar flare protection; dust protection; and meteoroid protection. A one-quarter scale dynamic model was built to study the dynamic behavior of the vehicle. The dynamic model closely captures the mechanical and electrical details of the total design.

  19. Translation and articulation in biological motion perception.

    PubMed

    Masselink, Jana; Lappe, Markus

    2015-08-01

    Recent models of biological motion processing focus on the articulational aspect of human walking investigated by point-light figures walking in place. However, in real human walking, the change in the position of the limbs relative to each other (referred to as articulation) results in a change of body location in space over time (referred to as translation). In order to examine the role of this translational component on the perception of biological motion we designed three psychophysical experiments of facing (leftward/rightward) and articulation discrimination (forward/backward and leftward/rightward) of a point-light walker viewed from the side, varying translation direction (relative to articulation direction), the amount of local image motion, and trial duration. In a further set of a forward/backward and a leftward/rightward articulation task, we additionally tested the influence of translational speed, including catch trials without articulation. We found a perceptual bias in translation direction in all three discrimination tasks. In the case of facing discrimination the bias was limited to short stimulus presentation. Our results suggest an interaction of articulation analysis with the processing of translational motion leading to best articulation discrimination when translational direction and speed match articulation. Moreover, we conclude that the global motion of the center-of-mass of the dot pattern is more relevant to processing of translation than the local motion of the dots. Our findings highlight that translation is a relevant cue that should be integrated in models of human motion detection. PMID:26270192

  20. Articulation index and hearing handicap.

    PubMed

    Holcomb, L M; Nerbonne, M A; Konkle, D F

    2000-04-01

    This investigation examined the relationship between perceived hearing handicap and the Articulation Index (AI) and the extent to which this relationship was influenced by the variables age, gender, degree of hearing loss, and audiometric slope. Subject age, gender, pure-tone thresholds, and scores for the Self-Assessment of Communication (SAC) and the Significant Other Assessment of Communication (SOAC) were extracted retrospectively from 373 patient files (194 males, 179 females). Correlation analysis revealed a significant (p < .01) negative relationship between AI values and both measures of hearing handicap, and also indicated that SAC/SOAC total scores correlated significantly (p < .01) with each other. Partial correlation analyses revealed that degree of hearing loss was the only variable under study that had substantial influence on the strength of AI/hearing handicap correlations. PMID:10783925

  1. The Articulation Committee Companion: 2011 Edition--A Resource for BC's Articulation Committees

    ERIC Educational Resources Information Center

    Finlay, Finola, Ed.; Orum, Jennifer, Ed.

    2011-01-01

    The Articulation Committee Companion is designed to serve as both an introductory resource for new articulation committee members and as an ongoing reference for committees. The Companion includes a brief overview of the province's articulation committees and their essential role in the post-secondary system. In addition, the Companion outlines…

  2. Dental Sealants

    MedlinePlus

    ... Data & Statistics > Find Data by Topic > Dental Sealants Dental Sealants Main Content Dental sealants are thin plastic coatings that protect the chewing surfaces of children’s back teeth from tooth decay. Overall, the prevalence of sealants ...

  3. Linearized motion estimation for articulated planes.

    PubMed

    Datta, Ankur; Sheikh, Yaser; Kanade, Takeo

    2011-04-01

    In this paper, we describe the explicit application of articulation constraints for estimating the motion of a system of articulated planes. We relate articulations to the relative homography between planes and show that these articulations translate into linearized equality constraints on a linear least-squares system, which can be solved efficiently using a Karush-Kuhn-Tucker system. The articulation constraints can be applied for both gradient-based and feature-based motion estimation algorithms and to illustrate this, we describe a gradient-based motion estimation algorithm for an affine camera and a feature-based motion estimation algorithm for a projective camera that explicitly enforces articulation constraints. We show that explicit application of articulation constraints leads to numerically stable estimates of motion. The simultaneous computation of motion estimates for all of the articulated planes in a scene allows us to handle scene areas where there is limited texture information and areas that leave the field of view. Our results demonstrate the wide applicability of the algorithm in a variety of challenging real-world cases such as human body tracking, motion estimation of rigid, piecewise planar scenes, and motion estimation of triangulated meshes.

  4. Status Report on the Illinois Articulation Initiative.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    The Illinois Articulation Initiative is a comprehensive statewide effort among colleges and universities to enhance the transfer process for students among all sectors of higher education in Illinois. One of the main features of the initiative is the general education core curriculum and a list of statewide articulated general education courses…

  5. Sources and Information: Revitalizing Articulation and Transfer.

    ERIC Educational Resources Information Center

    Palmer, James C.

    1982-01-01

    Reviews recent ERIC documents and journal articles dealing with the articulation and transfer process. Focuses on the status of the community college transfer function, the success of community college transfer students at four-year colleges, educational articulation, and experiential learning. Includes an extensive bibliography. (DMM)

  6. Dental Procedures.

    PubMed

    Ramponi, Denise R

    2016-01-01

    Dental problems are a common complaint in emergency departments in the United States. There are a wide variety of dental issues addressed in emergency department visits such as dental caries, loose teeth, dental trauma, gingival infections, and dry socket syndrome. Review of the most common dental blocks and dental procedures will allow the practitioner the opportunity to make the patient more comfortable and reduce the amount of analgesia the patient will need upon discharge. Familiarity with the dental equipment, tooth, and mouth anatomy will help prepare the practitioner for to perform these dental procedures. PMID:27482994

  7. Articulation effects in melody recognition memory.

    PubMed

    Wee Hun Lim, Stephen; Goh, Winston D

    2013-09-01

    Various surface features-timbre, tempo, and pitch-influence melody recognition memory, but articulation format effects, if any, remain unknown. For the first time, these effects were examined. In Experiment 1, melodies that remained in the same, or appeared in a different but similar, articulation format from study to test were recognized better than were melodies that were presented in a distinct format at test. A similar articulation format adequately induced matching processes to enhance recognition. Experiment 2 revealed that melodies rated as perceptually dissimilar on the basis of the location of the articulation mismatch did not impair recognition performance, suggesting an important boundary condition for articulation format effects on memory recognition-the matching of the memory trace and recognition probe may depend more on the overall proportion, rather than the temporal location, of the mismatch. The present findings are discussed in terms of a global matching advantage hypothesis. PMID:23410265

  8. [The temporo-mandibular articulation].

    PubMed

    Dargaud, J; Vinkka-Puhakka, H

    2004-04-01

    The standing posture of humans has created both morphological and functional adaptations in the temporo-mandibular joint and the masticatory function. This biped state is the one of the most important characteristic of human evolution. It is furthermore the agent determining most of the functional changes in the whole body. This survey will be carried out in several levels including, a descriptive anatomy, biomechanics, radiological imaging, functioning in the articulation of TMJ. The descriptive anatomic picture will be obtained by the traditional dissection techniques. 20 TMJ joints are dissected from 10 cadavers: 7 cadavers, 65-75 year old, 3 cadavers, 60-65 year old. The x-rays are lateral view and the subjects of the radiological imaging are young's, adults and olds: 1, 3 y-old Male; 1, 7 y-old Female; 1, 14 y-old Female; 10, 19-23 y-old Male; 1, 26 y-old Female; 1, 34 y-old Male; 1, 75 y-old Female. The anatomic elements in the TMJ well resembled the ones described in the literature of the capsule, the ligament, the masticator muscles (masseter, temporal, medial and lateral pterygoids). The temporo-mandibular ligament proved to be difficult to separate from the capsule in some of the specimens. Sometimes it was not always found after a dissection.

  9. Large planar maneuvers for articulated flexible manipulators

    NASA Technical Reports Server (NTRS)

    Huang, Jen-Kuang; Yang, Li-Farn

    1988-01-01

    An articulated flexible manipulator carried on a translational cart is maneuvered by an active controller to perform certain position control tasks. The nonlinear dynamics of the articulated flexible manipulator are derived and a transformation matrix is formulated to localize the nonlinearities within the inertia matrix. Then a feedback linearization scheme is introduced to linearize the dynamic equations for controller design. Through a pole placement technique, a robust controller design is obtained by properly assigning a set of closed-loop desired eigenvalues to meet performance requirements. Numerical simulations for the articulated flexible manipulators are given to demonstrate the feasibility and effectiveness of the proposed position control algorithms.

  10. Don't Hesitate--Articulate.

    ERIC Educational Resources Information Center

    Ervin, Gerard L.

    1980-01-01

    A three-stage program is described that a secondary school teacher can follow to establish and maintain contact with a nearby college language department. The program would facilitate articulation between secondary school and college. (Author/AMH)

  11. 21 CFR 872.3150 - Articulator.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... mechanical device intended to simulate movements of a patient's upper and lower jaws. Plaster casts of the... the patient's jaws. An articulator is intended to fit dentures or provide orthodontic treatment....

  12. Transfer and Articulation: Gaining Institutional Support and Developing Regional Relationships.

    ERIC Educational Resources Information Center

    Cipres, Elizabeth L.; Parish, Cynthia L.

    At Mount San Antonio College (MSAC) in Walnut, California, a full-time classified position of Articulation Specialist was created in 1989 to help the college's articulation officer establish the necessary articulation agreements for facilitating the transfer of MSAC students to four-year institutions. In addition, articulation officers from the 13…

  13. [The controversy of routine articulator mounting in orthodontics].

    PubMed

    Wang, Li; Han, Xianglong; Bai, Ding

    2013-06-01

    Articulators have been widely used by clinicians of dentistry. But routine articulator mounting is still controversial in orthodontics. Orthodontists oriented by gnathology approve routine articulator mounting while nongnathologic orthodontists disapprove it. This article reviews the thoughts of orthodontist that they agree or disagree with routine articulator mounting based on the considerations of biting, temporomandibular disorder (TMD), periodontitis, and so on.

  14. Dental Hygienists

    MedlinePlus

    ... anatomy, patient management, and periodontics, which is the study of gum disease. High school students interested in becoming dental hygienists should take courses in biology, chemistry, and math. Most dental hygiene programs also require applicants to have completed at ...

  15. Dental sealants

    MedlinePlus

    ... this page: //medlineplus.gov/ency/patientinstructions/000779.htm Dental sealants To use the sharing features on this ... case a sealant needs to be replaced. How Dental Sealants Are Applied Your dentist applies sealants on ...

  16. The Articulation Committee Companion: 2009 Edition. A Resource for BC's Articulation Committees

    ERIC Educational Resources Information Center

    Finlay, Finola, Ed.; Orum, Jennifer, Ed.

    2009-01-01

    The British Columbia Council on Admissions and Transfer (BCCAT) has designed The Articulation Committee Companion to serve as both an introductory resource for new members and as an ongoing reference for committees. The Companion includes a brief overview of the province's articulation committees and their essential role in the post-secondary…

  17. Gender Issues and Language Articulation; a Brief Look at Pros of Gender Neutral Language Articulation

    ERIC Educational Resources Information Center

    Ebrahimi, Pouria

    2009-01-01

    As with the language articulated by learners--in both oral and written form--the supremacy of a masculine language use is witnessed. This brings to light the fact that gender has been excessively an unobserved factor in the process of language teaching. Although learners are apparently used to forming masculine-centered articulation, non-sexist…

  18. Articulated Instruction Objectives Guide for Drafting. Final Document for Articulation of Drafting.

    ERIC Educational Resources Information Center

    Henderson, Wm. Edward, Jr.

    Intended for use in competency-based and criterion-referenced vocational programs, this articulated, performance-based instruction objectives guide for Drafting I is designed for reference use in the articulation of drafting programs at the secondary and postsecondary levels. It consists of a description of the development of the guide, 14…

  19. Articulation in Business Education for Secondary and Postsecondary Levels. Office Procedures Articulation Guide.

    ERIC Educational Resources Information Center

    Formby, Ronnie J.

    Focusing on courses in office procedures, this guide is one of a set of four articulation guides designed for articulating between secondary and postsecondary business education courses. (The other three guides focus on courses in typewriting, accounting, and shorthand.) Each guide presents a general course description, outlines of the major units…

  20. Articulation in Business Education for Secondary and Postsecondary Levels. Accounting Articulation Guide.

    ERIC Educational Resources Information Center

    Formby, Ronnie J.

    Focusing on courses in accounting, this guide is one of a set of four articulation guides designed for articulating between secondary and postsecondary business education courses. (The other three guides focus on courses in typewriting, shorthand, and office procedures.) Each guide presents a general course description, outlines of the major units…

  1. Effects of surround articulation on lightness depend on the spatial arrangement of the articulated region

    NASA Astrophysics Data System (ADS)

    Zemach, Iris K.; Rudd, Michael E.

    2007-07-01

    We investigated the effect of surround articulation on the perceived lightness of a target disk. Surround articulation was manipulated by varying either the number of wedges in a surround consisting of wedges of alternating luminance or the number of checks in a surround consisting of a radial checkerboard pattern. In most conditions, increased articulation caused incremental targets to appear lighter and decremental targets to appear darker. But increasing the surround articulation in a way that did not increase the number of target-coaligned edges in the display did not affect the target lightness. We propose that the effects of surround articulation depend on the relationship between the orientations and contrast polarities of the target edges and those of edges present within the surround.

  2. Cognitive predictors of articulation in writing.

    PubMed

    Wormack, L

    1979-06-01

    Among 106 college students scores on a spontaneous 20-min. essay were regressed on referents of verbal and visual spatial ability. 26% of the variability in writing articulation among males was accounted for by the regression of graded writing scores against logical relations and embedded figures tests. 82% of the variability in writing ability among (females was accounted for by the regression of graded writing scores on visual closure, reading comprehension, spatial visualization, and embedded figures tests. The use of verbal and visual sptial referents as predictors of the degree of articulation in spontaneous writing samples consistent with sex-specific models of.cerebral lateralization was described.

  3. Dental OCT

    NASA Astrophysics Data System (ADS)

    Colston, Bill W.; Sathyam, Ujwal S.; Dasilva, Luiz B.; Everett, Matthew J.; Stroeve, Pieter; Otis, L. L.

    1998-09-01

    We present here the first in vivo optical coherence tomography (OCT) images of human dental tissue. A novel dental optical coherence tomography system has been developed. This system incorporates the interferometer sample arm and transverse scanning optics into a handpiece that can be used intraorally to image human dental tissues. The average imaging depth of this system varied from 3 mm in hard tissues to 1.5 mm in soft tissues. We discuss the application of this imaging system for dentistry and illustrate the potential of our dental OCT system for diagnosis of periodontal disease, detection of caries, and evaluation of dental restorations.

  4. Articulation Workshop in Drafting. Final Report.

    ERIC Educational Resources Information Center

    Catonsville Community Coll., MD.

    Drafting students from vocational/technical and high schools frequently repeat the same experiences and courses and work with the same instructional materials when they enroll in college engineering drawing, and architecture programs. In order to minimize needless repetition and address the problem of articulation between such schools and the…

  5. Downward Articulation: The Bad and the Good.

    ERIC Educational Resources Information Center

    Berejikian, Harry

    These descriptions of articulation efforts between five community colleges and their feeder high schools were drawn from previous reports and from interviews with community college administrators. Interviews at two Los Angeles (California) community colleges revealed an attitude of unconcern toward maintaining a supply of high school graduates;…

  6. Thank God for Babel: Analysis, Articulation, Antimony.

    ERIC Educational Resources Information Center

    Nyberg, David

    1981-01-01

    Three approaches to philosophical inquiry (analysis, articulation, antimony) are explored in a commentary on "Philosophy and Education: Eightieth Yearbook of the National Society for the Study of Education." A discussion of the sometimes-contradictory school role in providing both educational excellence and socialization illustrates how these…

  7. Illinois Articulation Initiative: Policy and Procedures Manual.

    ERIC Educational Resources Information Center

    Illinois State Board of Higher Education, Springfield.

    This Policy and Procedures Manual was prepared by the Illinois Articulation Initiative (IAI) Technical Task Force to assist college and university administrators, faculty members, and other staff participating in the IAI. The preface contains background information on the IAI, whose goal is to facilitate inter-institutional transfer, and its…

  8. Articulation Management for Intelligent Integration of Information

    NASA Technical Reports Server (NTRS)

    Maluf, David A.; Tran, Peter B.; Clancy, Daniel (Technical Monitor)

    2001-01-01

    When combining data from distinct sources, there is a need to share meta-data and other knowledge about various source domains. Due to semantic inconsistencies and heterogeneity of representations, problems arise in combining multiple domains when the domains are merged. The knowledge that is irrelevant to the task of interoperation will be included, making the result unnecessarily complex. This heterogeneity problem can be eliminated by mediating the conflicts and managing the intersections of the domains. For interoperation and intelligent access to heterogeneous information, the focus is on the intersection of the knowledge, since intersection will define the required articulation rules. An algebra over domain has been proposed to use articulation rules to support disciplined manipulation of domain knowledge resources. The objective of a domain algebra is to provide the capability for interrogating many domain knowledge resources, which are largely semantically disjoint. The algebra supports formally the tasks of selecting, combining, extending, specializing, and modifying Components from a diverse set of domains. This paper presents a domain algebra and demonstrates the use of articulation rules to link declarative interfaces for Internet and enterprise applications. In particular, it discusses the articulation implementation as part of a production system capable of operating over the domain described by the IDL (interface description language) of objects registered in multiple CORBA servers.

  9. Articulated Multimedia Physics, Lesson 9, Universal Gravitation.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the ninth lesson of the Articulated Multimedia Physics Course, instructional materials relating to universal gravitation are presented in this study guide. The subject is concerned with the quantitative meaning of the law of universal gravitation and its applications in astronomy. The content is arranged in scrambled form, and the use of matrix…

  10. Articulated Multimedia Physics, Lesson 10, Circular Motion.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the tenth lesson of the Articulated Multimedia Physics Course, instructional materials relating to circular motion are presented in this study guide. The topics are concerned with instantaneous velocity, centripetal force, centrifugal force, and satellite paths. The content is arranged in scrambled form, and the use of matrix transparencies is…

  11. Articulated Multimedia Physics, Lesson 7, Combining Forces.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the seventh lesson of the Articulated Multimedia Physics Course, instructional materials are presented in this study guide with relation to the force combination. The topics are concerned with the definition and units of forces, sliding forces on inclined planes, and the equilibrant of two or more forces. The content is arranged in scrambled…

  12. ARTICULATION OF FOREIGN LANGUAGE INSTRUCTION IN UTAH.

    ERIC Educational Resources Information Center

    HOWE, ELLIOT C.

    THE FIVE DIVISIONS OF THIS MONOGRAPH ARE DEVOTED TO THE DIFFICULTIES OF ESTABLISHING SUCCESSFUL ARTICULATION IN PRESENT FOREIGN LANGUAGE PROGRAMS. PARTS I AND II ARE A DESCRIPTION OF THE PROBLEMS AND SUGGESTED SOLUTIONS AS VIEWED BY A FLES TEACHER, A JUNIOR HIGH SCHOOL TEACHER, A SENIOR HIGH SCHOOL TEACHER, AND A COLLEGE TEACHER. ADDITIONAL…

  13. Characterization of articulated vehicles using ladar seekers

    NASA Astrophysics Data System (ADS)

    Wellfare, Michael R.; Norris-Zachery, Karen

    1997-08-01

    Many vehicle targets of interest to military automatic target recognition (ATR) possess articulating components: that is, they have components that change position relative to the main body. Many vehicles also have multiple configurations wherein one or more devices or objects may be added to enhance specific military or logistical capabilities. As the expected target set for military ATR becomes more comprehensive, many additional articulations and optional components must be handled. Mobile air defense units often include moving radar antennae as well as turreted guns and missile launchers. Surface-to-surface missile launchers may be encountered with or without missiles, and with the launch rails raised or lowered. Engineers and countermine vehicles have a tremendous number of possible configurations and even conventional battle tanks may very items such as external reactive armor, long- range tanks, turret azimuth, and gun elevation. These changes pose a significant barrier to the target identification process since they greatly increase the range of possible target signatures. When combined with variations already encountered due to target aspect changes, an extremely large number of possible signatures is formed. Conventional algorithms cannot process so many possibilities effectively, so in response, the matching process is often made less selective. This degrades identification performance, increase false alarm rates, and increases data requirements for algorithm testing and training. By explicitly involving articulation in the detection and identification stages of an ATR algorithm, more precise matching constraints can be applied, and better selectivity can be achieve. Additional benefits include the measurement of the position and orientation of articulated components, which often has tactical significance. In this paper, the result of a study investigating the impact of target articulation in ATR for military vehicles are presented. 3D ladar signature

  14. The history of articulators: the "Articulator Wars" phenomenon with some circumstances leading up to it.

    PubMed

    Starcke, Edgar N; Engelmeier, Robert L; Belles, Donald M

    2010-06-01

    At the dawn of the 20th century, all was not well with the practice of "plate prostheses." Removable prosthodontics had been degrading for several decades and was now generally in low esteem, even though there had been many significant advances. W. E. Walker had introduced adjustable condylar guides, George Snow, the facebow, and Carl Christensen, a method for clinically measuring the condylar inclines. Nevertheless, the average practicing dentist was still using simple hinge articulators and was apathetic to the deplorable state of the artificial teeth available; however, this was all going to change dramatically when two dentists, Alfred Gysi and J. Leon Williams, working together between 1910 and 1914, presented to the profession the "Trubyte Artificial Tooth System" that embodied both a typal system for selecting anterior teeth and new posterior occlusal carvings that made possible, for the first time, the articulation of artificial teeth. This incited many of prosthetic dentistry's elite to introduce their own theories of mandibular movement and the articulators that they designed to reflect those theories. The intense debates that ensued, both in the meeting halls and in the literature, were numerous and lasted for decades. At the time, the "Articulator Wars" had both positive and negative consequences. Today, with many of the "Articulator Wars" issues remaining as part of the practice of dentistry, the "Articulator Wars" can be considered a phenomenon of enlightenment.

  15. Dental Implants

    MedlinePlus

    ... Procedures Dental Implants Dentures Direct Bonding Implants versus Bridges Orthodontics and Aligners Periodontal Plastic Surgery Porcelain Crowns Porcelain Fixed Bridges Porcelain Veneers Repairing Chipped Teeth Teeth Whitening Tooth- ...

  16. [Dental implants in tooth grinders].

    PubMed

    Lobbezoo, F; Brouwers, J E; Cune, M S; Naeije, M

    2004-03-01

    Bruxism (tooth grinding and clenching) is generally considered a contraindication for dental implants, although the evidence is usually based on clinical experience only. So far, studies to the possible cause-and-effect relationship between bruxism and implant failure do not yield consistent and specific outcomes. This is partly due to the large variation in the technical and the biological aspects of the investigations. Although there is still no proof that bruxism causes overload of dental implants and their suprastructures, a careful approach is recommended. Practical advices as to minimize the chance of implant failure are given. Besides the recommendation to reduce or eliminate bruxism itself, these advices concern the number and dimensions of the implants, the design of the occlusion and articulation patterns, and the use of a hard nightguard. PMID:15058243

  17. The LPN-ADN articulation project.

    PubMed

    Perlich, L J; Hopkin, L A; Kalunian, K; LeGault, G; Fried, M

    1989-01-01

    Faced with a staffing situation where RN positions were needed but there were more LPN positions than were needed. Tucson Medical Center began an LPN-ADN articulation project to rectify the situation without resorting to layoffs. With the cooperation of a local junior college, LPNs are enrolled in ADN programs that provide a more flexible work/study situation. This article describes the program and the results thus far.

  18. Existence of equilibria in articulated bearings

    NASA Astrophysics Data System (ADS)

    Buscaglia, G.; Ciuperca, I.; Hafidi, I.; Jai, M.

    2007-04-01

    The existence of equilibrium solutions for a lubricated system consisting of an articulated body sliding over a flat plate is considered. Though this configuration is very common (it corresponds to the popular tilting-pad thrust bearings), the existence problem has only been addressed in extremely simplified cases, such as planar sliders of infinite width. Our results show the existence of at least one equilibrium for a quite general class of (nonplanar) slider shapes. We also extend previous results concerning planar sliders.

  19. The Perceived Effects of State Governance Decentralization on Baccalaureate Articulation

    ERIC Educational Resources Information Center

    Falconetti, Angela M. Garcia

    2009-01-01

    Almost all community colleges provide baccalaureate degree access through the implementation of articulated programs of study called 2 + 2 agreements. Articulation agreements are designed to ensure that associate degree courses apply toward upper-level baccalaureate study. Florida has a long-standing statewide articulation policy that was highly…

  20. Articulation in Schoolchildren and Adults with Neurofibromatosis Type 1

    ERIC Educational Resources Information Center

    Cosyns, Marjan; Mortier, Geert; Janssens, Sandra; Bogaert, Famke; D'Hondt, Stephanie; Van Borsel, John

    2012-01-01

    Several authors mentioned the occurrence of articulation problems in the neurofibromatosis type 1 (NF1) population. However, few studies have undertaken a detailed analysis of the articulation skills of NF1 patients, especially in schoolchildren and adults. Therefore, the aim of the present study was to examine in depth the articulation skills of…

  1. Dental Hygienist.

    ERIC Educational Resources Information Center

    Ohio State Univ., Columbus. Center on Education and Training for Employment.

    This document, which is designed for use in developing a tech prep competency profile for the occupation of dental hygienist, lists technical competencies and competency builders for 13 units pertinent to the health technologies cluster in general and 9 units specific to the occupation of dental hygienist. The following skill areas are covered in…

  2. Dental Implants.

    PubMed

    Zohrabian, Vahe M; Sonick, Michael; Hwang, Debby; Abrahams, James J

    2015-10-01

    Dental implants restore function to near normal in partially or completely edentulous patients. A root-form implant is the most frequently used type of dental implant today. The basis for dental implants is osseointegration, in which osteoblasts grow and directly integrate with the surface of titanium posts surgically embedded into the jaw. Radiologic assessment is critical in the preoperative evaluation of the dental implant patient, as the exact height, width, and contour of the alveolar ridge must be determined. Moreover, the precise locations of the maxillary sinuses and mandibular canals, as well as their relationships to the site of implant surgery must be ascertained. As such, radiologists must be familiar with implant design and surgical placement, as well as augmentation procedures utilized in those patients with insufficient bone in the maxilla and mandible to support dental implants.

  3. Dental OCT

    NASA Astrophysics Data System (ADS)

    Wilder-Smith, Petra; Otis, Linda; Zhang, Jun; Chen, Zhongping

    This chapter describes the applications of OCT for imaging in vivo dental and oral tissue. The oral cavity is a diverse environment that includes oral mucosa, gingival tissues, teeth and their supporting structures. Because OCT can image both hard and soft tissues of the oral cavity at high resolution, it offers the unique capacity to identity dental disease before destructive changes have progressed. OCT images depict clinically important anatomical features such as the location of soft tissue attachments, morphological changes in gingival tissue, tooth decay, enamel thickness and decay, as well as the structural integrity of dental restorations. OCT imaging allows for earlier intervention than is possible with current diagnostic modalities.

  4. Dental Fluorosis

    MedlinePlus

    ... when children regularly consume fluoride during the teeth-forming years, age 8 and younger. Most dental fluorosis ... over a long period when the teeth are forming under the gums. Only children aged 8 years ...

  5. Static balancing of planar articulated robots

    NASA Astrophysics Data System (ADS)

    Quaglia, Giuseppe; Yin, Zhe

    2015-12-01

    Static balancing for a manipulator's weight is necessary in terms of energy saving and performance improvement. This paper proposes a method to design balancing devices for articulated robots in industry, based on robotic dynamics. Full design details for the balancing system using springs are presented from two aspects: One is the optimization for the position of the balancing system; the other is the design of the spring parameters. As examples, two feasible balancing devices are proposed, based on different robotic structures: The first solution consists of linkages and springs; the other consists of pulleys, cross mechanisms and (hydro-) pneumatic springs. Then the two solutions are compared. Pneumatic, hydro-pneumatic and mechanical springs are discussed and their parameters are decided according to the requirements of torque compensation. Numerical results show that with the proper design using the methodology presented in this paper, an articulated robot can be statically balanced perfectly in all configurations. This paper therefore provides a design method of the balancing system for other similar structures.

  6. Design of a wheeled articulating land rover

    NASA Astrophysics Data System (ADS)

    Stauffer, Larry; Dilorenzo, Mathew; Yandle, Barbara

    1994-01-01

    The WALRUS is a wheeled articulating land rover that will provide Ames Research Center with a reliable, autonomous vehicle for demonstrating and evaluating advanced technologies. The vehicle is one component of the Ames Research Center's on-going Human Exploration Demonstration Project. Ames Research Center requested a system capable of traversing a broad spectrum of surface types and obstacles. In addition, this vehicle must have an autonomous navigation and control system on board and its own source of power. The resulting design is a rover that articulates in two planes of motion to allow for increased mobility and stability. The rover is driven by six conical shaped aluminum wheels, each with an independent, internally coupled motor. Mounted on the rover are two housings and a removable remote control system. In the housings, the motor controller board, tilt sensor, navigation circuitry, and QED board are mounted. Finally, the rover's motors and electronics are powered by thirty C-cell rechargeable batteries, which are located in the rover wheels and recharged by a specially designed battery charger.

  7. Articulation rate across dialect, age, and gender.

    PubMed

    Jacewicz, Ewa; Fox, Robert A; O'Neill, Caitlin; Salmons, Joseph

    2009-07-01

    The understanding of sociolinguistic variation is growing rapidly, but basic gaps still remain. Whether some languages or dialects are spoken faster or slower than others constitutes such a gap. Speech tempo is interconnected with social, physical and psychological markings of speech. This study examines regional variation in articulation rate and its manifestations across speaker age, gender and speaking situations (reading vs. free conversation). The results of an experimental investigation show that articulation rate differs significantly between two regional varieties of American English examined here. A group of Northern speakers (from Wisconsin) spoke significantly faster than a group of Southern speakers (from North Carolina). With regard to age and gender, young adults read faster than older adults in both regions; in free speech, only Northern young adults spoke faster than older adults. Effects of gender were smaller and less consistent; men generally spoke slightly faster than women. As the body of work on the sociophonetics of American English continues to grow in scope and depth, we argue that it is important to include fundamental phonetic information as part of our catalog of regional differences and patterns of change in American English.

  8. A survey on the utilization of disposable quadrant articulators.

    PubMed

    Thornton, Linda J

    2002-01-01

    This study evaluated utilization of the six most popular disposable quadrant articulators presently used in crown fabrication. Most general practitioners and crown and bridge laboratory technicians reported that they frequently or always used disposable quadrant articulators for single units and simple three-unit fixed partial dentures. All evaluated articulators demonstrated an inability to maintain and repeat the centric stop position. The disposable quadrant articulator, used in combination with dual-arch impressions, is a viable method for fabricating single and short-span restorations. While a nonrepeatable centric stop was present in all six articulators evaluated, the method was considered a time-efficient and cost-saving alternative to traditional all-metal simple-hinge articulators.

  9. CSI design of articulated space structures. [Controls Structures Interaction

    NASA Technical Reports Server (NTRS)

    Kelkar, Atul G.; Koganti, Gopichand; Alberts, Thomas E.; Hou, Gene; Woodard, Stanley E.

    1992-01-01

    Integrated control and structural design of flexible spacecraft with articulated appendages is considered. A procedure is proposed by which the resulting design is optimal with respect to a measure of performance for all possible system articulation conditions. The controller design is of the dynamic dissipative type which provides guaranteed closed-loop stability. The procedure is demonstrated for a simple multibody flexible spacecraft model with an articulated appendage.

  10. Human object articulation for CCTV video forensics

    NASA Astrophysics Data System (ADS)

    Zafar, I.; Fraz, M.; Edirisinghe, Eran A.

    2013-03-01

    In this paper we present a system which is focused on developing algorithms for automatic annotation/articulation of humans passing through a surveillance camera in a way useful for describing a person/criminal by a crime scene witness. Each human is articulated/annotated based on two appearance features: 1. primary colors of clothes in the head, body and legs region. 2. presence of text/logo on the clothes. The annotation occurs after a robust foreground extraction based on a modified approach to Gaussian Mixture model and detection of human from segmented foreground images. The proposed pipeline consists of a preprocessing stage where we improve color quality of images using a basic color constancy algorithm and further improve the results using a proposed post-processing method. The results show a significant improvement to the illumination of the video frames. In order to annotate color information for human clothes, we apply 3D Histogram analysis (with respect to Hue, Saturation and Value) on HSV converted image regions of human body parts along with extrema detection and thresholding to decide the dominant color of the region. In order to detect text/logo on the clothes as another feature to articulate humans, we begin with the extraction of connected components of enhanced horizontal, vertical and diagonal edges in the frames. These candidate regions are classified as text or non-text on the bases of their Local Energy based Shape Histogram (LESH) features combined with KL divergence as classification criteria. To detect humans, a novel technique has been proposed that uses a combination of Histogram of Oriented Gradients (HOG) and Contourlet transform based Local Binary Patterns (LBP) with Adaboost as classifier. Initial screening of foreground objects is performed by using HOG features. To further eliminate the false positives due to noise form background and improve results, we apply Contourlet-LBP feature extraction on the images. In the proposed method

  11. Highly accurate articulated coordinate measuring machine

    DOEpatents

    Bieg, Lothar F.; Jokiel, Jr., Bernhard; Ensz, Mark T.; Watson, Robert D.

    2003-12-30

    Disclosed is a highly accurate articulated coordinate measuring machine, comprising a revolute joint, comprising a circular encoder wheel, having an axis of rotation; a plurality of marks disposed around at least a portion of the circumference of the encoder wheel; bearing means for supporting the encoder wheel, while permitting free rotation of the encoder wheel about the wheel's axis of rotation; and a sensor, rigidly attached to the bearing means, for detecting the motion of at least some of the marks as the encoder wheel rotates; a probe arm, having a proximal end rigidly attached to the encoder wheel, and having a distal end with a probe tip attached thereto; and coordinate processing means, operatively connected to the sensor, for converting the output of the sensor into a set of cylindrical coordinates representing the position of the probe tip relative to a reference cylindrical coordinate system.

  12. Flutter of articulated pipes at finite amplitude

    NASA Technical Reports Server (NTRS)

    Rousselet, J.; Herrmann, G.

    1977-01-01

    The plane motion of an articulated pipe made of two segments is examined and the flow velocity at which flutter manifests itself is sought. The pressure in the reservoir feeding the pipe is kept constant. In contrast to previous works, the flow velocity is not taken as a prescribed parameter of the system but is left to follow the laws of motion. This approach requires a nonlinear formulation of the problem and the equations of motion are solved using Krylov-Bogoliubov's method. A graph of the amplitude of the limit cycles, as a function of the fluid-system mass ratio, is presented and conclusions are drawn as to the necessity of considering nonlinearities in the analysis.

  13. Dental Calculus Arrest of Dental Caries

    PubMed Central

    Keyes, Paul H.; Rams, Thomas E.

    2016-01-01

    Background An inverse relationship between dental calculus mineralization and dental caries demineralization on teeth has been noted in some studies. Dental calculus may even form superficial layers over existing dental caries and arrest their progression, but this phenomenon has been only rarely documented and infrequently considered in the field of Cariology. To further assess the occurrence of dental calculus arrest of dental caries, this study evaluated a large number of extracted human teeth for the presence and location of dental caries, dental calculus, and dental plaque biofilms. Materials and methods A total of 1,200 teeth were preserved in 10% buffered formal saline, and viewed while moist by a single experienced examiner using a research stereomicroscope at 15-25× magnification. Representative teeth were sectioned and photographed, and their dental plaque biofilms subjected to gram-stain examination with light microscopy at 100× magnification. Results Dental calculus was observed on 1,140 (95%) of the extracted human teeth, and no dental carious lesions were found underlying dental calculus-covered surfaces on 1,139 of these teeth. However, dental calculus arrest of dental caries was found on one (0.54%) of 187 evaluated teeth that presented with unrestored proximal enamel caries. On the distal surface of a maxillary premolar tooth, dental calculus mineralization filled the outer surface cavitation of an incipient dental caries lesion. The dental calculus-covered carious lesion extended only slightly into enamel, and exhibited a brown pigmentation characteristic of inactive or arrested dental caries. In contrast, the tooth's mesial surface, without a superficial layer of dental calculus, had a large carious lesion going through enamel and deep into dentin. Conclusions These observations further document the potential protective effects of dental calculus mineralization against dental caries. PMID:27446993

  14. Articulation Agreements between High Schools, Community Colleges, and Universities.

    ERIC Educational Resources Information Center

    Illinois Community Coll. Board, Springfield.

    Designed to assist college officials in developing and revising articulation agreements, this report describes specific program articulation efforts between Illinois high schools, community colleges, and public and private universities. Data presented were drawn from a survey of 102 public and private community colleges, which resulted in 94…

  15. 2 + 2 + 2 Articulation: A Partnership for Excellence.

    ERIC Educational Resources Information Center

    American River Coll., Sacramento, CA.

    To facilitate articulation agreements with local high schools, the American River College (ARC) created the Articulation Council composed of members of the college administration and the administrations of several local high school districts. From this committee, secondary school/college faculty committees were formed to examine articulation…

  16. The Illinois Articulation Initiative: Annual Report, 2002-2003.

    ERIC Educational Resources Information Center

    Illinois State Board of Higher Education, Springfield.

    This document consists of two reports on Illinois higher education. The first, "The Illinois Articulation Initiative: Annual Report 2002-2003," discusses the current status of the Illinois Articulation Imitative (IAI), which was designed to ease transfer for students among Illinois colleges and universities. May 2003 marked the end of the fifth…

  17. The Oklahoma PN/ADN Articulation Project Report.

    ERIC Educational Resources Information Center

    Oklahoma State Regents for Higher Education, Oklahoma City.

    In response to a critical nursing shortage in the state of Oklahoma, the Oklahoma Practical Nursing (PN)/Associate Degree Nursing (ADN) Articulation Project Coordinating Committee was formed in spring 1990 to develop a proposal for program articulation. A curriculum matrix was designed and adopted for use by five regional subcommittees which…

  18. Perceived Articulation Uniformity between Trumpet and Violin Performances

    ERIC Educational Resources Information Center

    Cooper, Shelly C.; Hamann, Donald L.

    2010-01-01

    Directors strive for a unified sound throughout their wind and orchestra ensembles. Articulation affects sound uniformity among winds and strings. This baseline study examined whether a trumpet player could better match a violin player's articulation, as perceived by participants listening to a recording of two performances, when: (a) performing…

  19. Perceptual Learning of Co-Articulation in Speech

    ERIC Educational Resources Information Center

    Connine, Cynthia M.; Darnieder, Laura M.

    2009-01-01

    Four experiments investigated the novel issue of learning to accommodate the co-articulated nature of speech. Experiment 1 established a co-articulatory mismatch effect for a set of vowel-consonant (VC) syllables (reaction times were faster for co-articulation matching than for mismatching stimuli). A rhyme judgment training task on words…

  20. Articulation and Transfer: Critical Contributions to Lifelong Learning.

    ERIC Educational Resources Information Center

    Kintzer, Frederick C.

    Articulation can be understood as the processes and relationships involved in the vertical and lateral movement of students throughout a formal education system. Transfer, or the mechanics of credit, course, and curriculum exchange, is one process of articulation, while lifelong learning incorporates experiential learning and continuing education…

  1. Foreign Language Articulation in High Schools and Colleges.

    ERIC Educational Resources Information Center

    Smith, Marina V.

    A conference workshop for foreign language teachers on improving articulation between high schools and colleges, and the efforts resulting from the articulation in one district, are described by a participant from a community college. The session brought together 30 teachers committed to taking responsibility for colleague cooperation in their…

  2. Articulating Vocational Education at the Postsecondary Level: A National Study

    ERIC Educational Resources Information Center

    Bushnell, David S.

    1978-01-01

    The project director reports on the AACJC/AVA national joint study of articulation practices at twenty-two sites randomly selected from a list of 140 recommended locations. Visitation teams conducted interviews to document the extent of articulation among institutions offering vocational and technical education at the secondary and postsecondary…

  3. Competency-Based Route to Vertical Curriculum Articulation.

    ERIC Educational Resources Information Center

    Burger, Laura; And Others

    What competency-based instruction is and how it can help improve vertical articulation between the curriculum of secondary and postsecondary vocational-technical education programs in Minnesota is the focus of this booklet. Explanation consists of responses to the following questions: (1) What is vertical curriculum articulation? (2) What is…

  4. Sealants and dental caries

    PubMed Central

    O’Donnell, Jean A.; Modesto, Adriana; Oakley, Marnie; Polk, Deborah E.; Valappil, Benita; Spallek, Heiko

    2013-01-01

    Background The authors conducted a qualitative study of private-practice dentists in their offices by using vignette-based interviews to assess barriers to the use of evidence-based clinical recommendations in the treatment of noncavitated carious lesions. Methods The authors recruited 22 dentists as a convenience sample and presented them with two patient vignettes involving noncavitated carious lesions. Interviewers asked participants to articulate their thought processes as they described treatment recommendations. Participants compared their treatment plans with the American Dental Association’s recommendations for sealing noncavitated carious lesions, and they described barriers to implementing these recommendations in their practices. The authors recorded and transcribed the sessions for accuracy and themes. Results Personal clinical experience emerged as the determining factor in dentists’ treatment decisions regarding noncavitated carious lesions. Additional factors were lack of reimbursement and mistrust of the recommendations. The authors found that knowledge of the recommendations did not lead to their adoption when the recommendation was incongruent with the dentist’s personal experience. Conclusions The authors found that ingrained practice behavior based on personal clinical experience that differed substantially from evidence-based recommendations resulted in a rejection of these recommendations. Practical Implications Attempts to improve the adoption of evidence-based practice must involve more than simple dissemination of information to achieve a balance between personal clinical experience and scientific evidence. PMID:23543700

  5. Dental Assistant.

    ERIC Educational Resources Information Center

    Michigan State Univ., East Lansing. Coll. of Agriculture and Natural Resources Education Inst.

    This curriculum guide, developed for use in dental assistant education programs in Michigan, describes a task-based curriculum that can help a teacher to develop a classroom management system where students learn by doing. It is based on task analysis and reflects the skills, knowledge, and attitudes that employers expect entry-level dental…

  6. Program to Program Articulation: Progress, Perceptions, and Procedures for Articulation from Two-Year Programs to Four-Year Programs.

    ERIC Educational Resources Information Center

    Sullivan, Brenda L.

    The primary purpose of this study was to investigate the perception of two-year and four-year college students, faculty, and chief administration officers related to current articulation practices. The study also aimed to determine the desired components for a successful articulation and transfer system, and to identify any significant differences…

  7. Locus equations derived from compensatory articulation.

    PubMed

    Sussman, H M; Fruchter, D; Cable, A

    1995-05-01

    Locus equations are linear regressions of the onset of F2 transitions on their offsets. These functions vowel-normalize the F2 transitions such that they are able to characterize consonantal place categories. The purpose of this research was to determine if compensatory articulation due to bite blocks would alter the normally linear relationship between F2 transition onset and offset frequencies or alter the differential slopes and y intercepts of locus equations as a function of stop place. Six speakers, three male and three female, each produced /bVt/, /dVt/, and /gVt/ tokens for ten vowel contexts under normal and bite block conditions. Extremely linear and practically identical scatterplots were obtained in the two speaking conditions. No adaptation to the bite blocks was found when comparing locus equations derived from the initial versus the final bite block trial. Results are discussed in relation to the "orderly output constraint," which postulates a perceptual function for linearly related F2 transition end points within consonantal place categories.

  8. Vocal Tract Articulation in Zebra Finches

    PubMed Central

    Ohms, Verena R.; Snelderwaard, Peter Ch.; ten Cate, Carel; Beckers, Gabriël J. L.

    2010-01-01

    Background Birdsong and human vocal communication are both complex behaviours which show striking similarities mainly thought to be present in the area of development and learning. Recent studies, however, suggest that there are also parallels in vocal production mechanisms. While it has been long thought that vocal tract filtering, as it occurs in human speech, only plays a minor role in birdsong there is an increasing number of studies indicating the presence of sound filtering mechanisms in bird vocalizations as well. Methodology/Principal Findings Correlating high-speed X-ray cinematographic imaging of singing zebra finches (Taeniopygia guttata) to song structures we identified beak gape and the expansion of the oropharyngeal-esophageal cavity (OEC) as potential articulators. We subsequently manipulated both structures in an experiment in which we played sound through the vocal tract of dead birds. Comparing acoustic input with acoustic output showed that OEC expansion causes an energy shift towards lower frequencies and an amplitude increase whereas a wide beak gape emphasizes frequencies around 5 kilohertz and above. Conclusion These findings confirm that birds can modulate their song by using vocal tract filtering and demonstrate how OEC and beak gape contribute to this modulation. PMID:20689831

  9. Nasal reconstruction with articulated irradiated rib cartilage

    SciTech Connect

    Murakami, C.S.; Cook, T.A.; Guida, R.A. )

    1991-03-01

    Nasal structural reconstruction is a formidable task in cases where there is loss of support to both the nasal dorsum and tip. A multitude of surgical approaches and materials have been used for the correction of the saddle-nose deformity with varying degrees of success. Articulated irradiated rib cartilage inserted through an external rhinoplasty approach was used to reconstruct nasal deformities in 18 patients over a 6-year period. Simultaneous use of a midline forehead flap to reconstruct the overlying soft tissue was required in four cases. Follow-up ranged from 1 to 6 years (mean, 2.8 years). Results were rewarding in most cases with marked improvement in nasal support and airway. Revision and/or replacement secondary to trauma or warping of the graft was required in four cases. None of the patients exhibited infection, extrusion, or noticeable resorption. A description of the surgical technique, review of all the cases, and recommendation for continued use of this graft material are discussed.

  10. Consonant recognition and the articulation index

    NASA Astrophysics Data System (ADS)

    Allen, Jont B.

    2005-04-01

    The purpose of this paper is to provide insight into how speech is processed by the auditory system, by quantifying the nature of nonsense speech sound confusions. (1) The Miller and Nicely [J. Acoust. Soc. Am. 27(2), 338-352 (1955)] confusion matrix (CM) data are analyzed by plotting the CM elements Si,j(SNR) as a function of the signal-to-noise ratio (SNR). This allows for the robust clustering of perceptual feature (event) groups, not robustly defined by a single CM table, where clusters depend on the sound order. (2) The SNR is then re-expressed as an articulation index (AI), and used as the independent variable. The normalized log scores log(1-Si,i(AI)) and log(Si,j(AI)), j≠i, then become linear functions of AI, on log-error versus AI plots. This linear dependence may be interpreted as an extension of the band-independence model of Fletcher. (3) The model formula for the average score for the finite-alphabet case Pc(AI,H)=∑i=1NSi,i/N is then modified to include the effect of entropy H. Due to the grouping of sounds with increased SNR (and AI), the sound-group entropy Hg plays a key role in this performance measure. (4) A parametric model for the confusions Si,j(AI,Hg) is then described, which characterizes the confusions between competing sounds within a group. .

  11. A USPL functional system with articulated mirror arm for in-vivo applications in dentistry

    NASA Astrophysics Data System (ADS)

    Schelle, Florian; Meister, Jörg; Dehn, Claudia; Oehme, Bernd; Bourauel, Christoph; Frentzen, Mathias

    Ultra-short pulsed laser (USPL) systems for dental application have overcome many of their initial disadvantages. However, a problem that has not yet been addressed and solved is the beam delivery into the oral cavity. The functional system that is introduced in this study includes an articulated mirror arm, a scanning system as well as a handpiece, allowing for freehand preparations with ultra-short laser pulses. As laser source an Nd:YVO4 laser is employed, emitting pulses with a duration of tp < 10 ps at a repetition rate of up to 500 kHz. The centre wavelength is at 1064 nm and the average output power can be tuned up to 9 W. The delivery system consists of an articulated mirror arm, to which a scanning system and a custom made handpiece are connected, including a 75 mm focussing lens. The whole functional system is compact in size and moveable. General characteristics like optical losses and ablation rate are determined and compared to results employing a fixed setup on an optical table. Furthermore classical treatment procedures like cavity preparation are being demonstrated on mammoth ivory. This study indicates that freehand preparation employing an USPL system is possible but challenging, and accompanied by a variety of side-effects. The ablation rate with fixed handpiece is about 10 mm3/min. Factors like defocussing and blinding affect treatment efficiency. Laser sources with higher average output powers might be needed in order to reach sufficient preparation speeds.

  12. Gust Mitigation of Micro Air Vehicles Using Passive Articulated Wings

    PubMed Central

    Slegers, Nathan

    2014-01-01

    Birds and insects naturally use passive flexing of their wings to augment their stability in uncertain aerodynamic environments. In a similar manner, micro air vehicle designers have been investigating using wing articulation to take advantage of this phenomenon. The result is a class of articulated micro air vehicles where artificial passive joints are designed into the lifting surfaces. In order to analyze how passive articulation affects performance of micro air vehicles in gusty environments, an efficient 8 degree-of-freedom model is developed. Experimental validation of the proposed mathematical model was accomplished using flight test data of an articulated micro air vehicle obtained from a high resolution indoor tracking facility. Analytical investigation of the gust alleviation properties of the articulated micro air vehicle model was carried out using simulations with varying crosswind gust magnitudes. Simulations show that passive articulation in micro air vehicles can increase their robustness to gusts within a range of joint compliance. It is also shown that if articulation joints are made too compliant that gust mitigation performance is degraded when compared to a rigid system. PMID:24516368

  13. Gust mitigation of micro air vehicles using passive articulated wings.

    PubMed

    Oduyela, Adetunji; Slegers, Nathan

    2014-01-01

    Birds and insects naturally use passive flexing of their wings to augment their stability in uncertain aerodynamic environments. In a similar manner, micro air vehicle designers have been investigating using wing articulation to take advantage of this phenomenon. The result is a class of articulated micro air vehicles where artificial passive joints are designed into the lifting surfaces. In order to analyze how passive articulation affects performance of micro air vehicles in gusty environments, an efficient 8 degree-of-freedom model is developed. Experimental validation of the proposed mathematical model was accomplished using flight test data of an articulated micro air vehicle obtained from a high resolution indoor tracking facility. Analytical investigation of the gust alleviation properties of the articulated micro air vehicle model was carried out using simulations with varying crosswind gust magnitudes. Simulations show that passive articulation in micro air vehicles can increase their robustness to gusts within a range of joint compliance. It is also shown that if articulation joints are made too compliant that gust mitigation performance is degraded when compared to a rigid system. PMID:24516368

  14. Excitability of hand motor areas during articulation of syllables.

    PubMed

    Komeilipoor, Naeem; Tiainen, Mikko; Tiippana, Kaisa; Vainio, Martti; Vainio, Lari

    2016-05-01

    It is known that articulating different syllables is linked to different grasp actions, e.g. [ti] is linked to precision grip, and [kɑ] to power grip. The aim of the present study was to test whether articulating or hearing these syllables would result in an increased activity in the representation of hand muscles involved in these two actions in a muscle-specific manner. To this end, we used transcranial magnetic stimulation (TMS) to investigate changes in the excitability of the left primary motor cortex (M1) innervating hand muscles while participants articulated or listened to meaningless syllables, listened to a metronome, or observed a fixation cross. The motor-evoked potentials of two hand muscles associated with either a precision or power grip exhibited significantly greater amplitudes during articulation than in passive listening, metronome, and fixation cross conditions. Moreover, these muscles exhibited similar patterns of excitability during articulation regardless of which syllable was articulated. The increased excitability of the left M1 hand area during articulation, but not during perception of the syllables, might be due to the cortico-cortical interaction between the motor representations of oral organs with the hand area. PMID:27057730

  15. Dental practice in Paris.

    PubMed

    Baron, Pierre

    2003-01-01

    This describes dental practice and the availability of dental patent remedies in Paris. Accounts of legal disputes, from original sources, illustrate the status and social history of some of the most wealthy dental practitioners in Paris during the Revolution.

  16. American Dental Association

    MedlinePlus

    ... Public Prevention Summit ADA Find-a-Dentist Health Literacy in Dentistry Volunteer Efforts Dental Benefit Plan Information ... on Sleep Bruxism Rethinking Dental Insurance Oral Health Literacy's Role in Missed Appointments Dental Implant Failure Rate ...

  17. The Modified Semidirect Onlay Technique With Articulated Elastic Model.

    PubMed

    Papazoglou, Efstratios; Diamantopoulou, Sofia

    2015-12-01

    The modified semidirect onlay technique with articulated elastic model involves the fabrication of a stone model that is quickly mounted on an articulator and it includes an elastic part that enables the fabrication of a restoration with proper occlusal anatomy. The technique overcomes the disadvantages of the direct technique such as polymerization shrinkage stress and difficulty in achieving proper contours and, compared to the indirect technique, treatment is completed in a single appointment, without laboratory cost. The novelty of the technique is that, since the restoration is fabricated on an articulated model it eliminates time for occlusal adjustments. PMID:26767243

  18. Patterns of articulation abilities in speakers with cleft palate.

    PubMed

    Van Demark, D R; Morris, H L; Vandehaar, C

    1979-07-01

    The purpose of this study was to report the articulation scores of 351 subjects with cleft palate from the ages of 2-6 to 18-0. Analysis of the data indicate that, as a group, subjects with cleft palate are retarded in articulation skills. However, they continue to improve in this regard past the age at which normal speakers have achieved articulation maturation. This information should be compared with that acquired from other centers in order to determine how typical these findings are.

  19. The Modified Semidirect Onlay Technique With Articulated Elastic Model.

    PubMed

    Papazoglou, Efstratios; Diamantopoulou, Sofia

    2015-12-01

    The modified semidirect onlay technique with articulated elastic model involves the fabrication of a stone model that is quickly mounted on an articulator and it includes an elastic part that enables the fabrication of a restoration with proper occlusal anatomy. The technique overcomes the disadvantages of the direct technique such as polymerization shrinkage stress and difficulty in achieving proper contours and, compared to the indirect technique, treatment is completed in a single appointment, without laboratory cost. The novelty of the technique is that, since the restoration is fabricated on an articulated model it eliminates time for occlusal adjustments.

  20. Dental implants in patients with bruxing habits.

    PubMed

    Lobbezoo, F; Brouwers, J E I G; Cune, M S; Naeije, M

    2006-02-01

    Bruxism (teeth grinding and clenching) is generally considered a contraindication for dental implants, although the evidence for this is usually based on clinical experience only. So far, studies to the possible cause-and-effect relationship between bruxism and implant failure do not yield consistent and specific outcomes. This is partly because of the large variation in the literature in terms of both the technical aspects and the biological aspects of the study material. Although there is still no proof for the suggestion that bruxism causes an overload of dental implants and of their suprastructures, a careful approach is recommended. There are a few practical guidelines as to minimize the chance of implant failure. Besides the recommendation to reduce or eliminate bruxism itself, these guidelines concern the number and dimensions of the implants, the design of the occlusion and articulation patterns, and the protection of the final result with a hard occlusal stabilization splint (night guard). PMID:16457676

  1. Dental students--dental advocates.

    PubMed

    Bensch, Brittany

    2010-01-01

    Student advocacy and involvement in the political process is built into the structure of the American Student Dental Association (ASDA), especially in its Legislative Grassroots Network and an internal communication network among students to ensure political awareness. Students are concerned with such issues as a universally accepted, non-patient-based licensure process, mid-level providers, loan availability and tax deductibility, financial support for schools, and service early in one's professional career (giving forward rather than giving back). Through collaboration with the American Dental Education Association and with many state associations, students participate in lobbying, awareness campaigns, and behind the scenes as legislative aids. Although students share the same love for the profession that animates established practitioners, they are perceived by legislators as being different. Students are involved in the legislative process because it represents their future.

  2. Dental students--dental advocates.

    PubMed

    Bensch, Brittany

    2010-01-01

    Student advocacy and involvement in the political process is built into the structure of the American Student Dental Association (ASDA), especially in its Legislative Grassroots Network and an internal communication network among students to ensure political awareness. Students are concerned with such issues as a universally accepted, non-patient-based licensure process, mid-level providers, loan availability and tax deductibility, financial support for schools, and service early in one's professional career (giving forward rather than giving back). Through collaboration with the American Dental Education Association and with many state associations, students participate in lobbying, awareness campaigns, and behind the scenes as legislative aids. Although students share the same love for the profession that animates established practitioners, they are perceived by legislators as being different. Students are involved in the legislative process because it represents their future. PMID:21314046

  3. The Crucial Role of Faculty in Transfer Articulation.

    ERIC Educational Resources Information Center

    Berger, Renee; Ruiz, Aida M. Ortiz

    1988-01-01

    Describes the Hostos Community College (HCC) articulation model, which involved faculty, student services, and administrators developing course equivalency listings; faculty development activities; acquiring and computerizing student information; creating faculty and alumni advisement programs; establishing discipline-based transfer tracts…

  4. King County Metro Transit Hybrid Articulated Buses: Final Evaluation Results

    SciTech Connect

    Chandler, K.; Walkowicz, K.

    2006-12-01

    Final technical report compares and evaluates new diesel and diesel hybrid-electric articulated buses operated as part of the King County Metro Transit (KC Metro) fleet in Seattle, Washington. The evaluation lasted 12 months.

  5. Modification of consonant speech-sound articulation in young children.

    PubMed

    Johnston, J M; Johnston, G T

    1972-01-01

    A series of three experiments was performed in a classroom setting with small groups of young children with severe articulation problems. Variations on a basic token reinforcement procedure were demonstrated in each experiment. A combined multiple baseline/reversal design showed effective experimenter control of rates of correct and incorrect consonant sound articulation in all cases. In addition, the data in each experiment showed the problems of obtaining stimulus generalization of the high rates of correct articulation to non-training settings. The third experiment demonstrated a procedure for producing such generalization by making each child a discriminative stimulus for correct articulaton by the other child, thus maintaining high levels of correct articulation for each child when in the presence of the other. PMID:16795346

  6. Finding Strong Bridges and Strong Articulation Points in Linear Time

    NASA Astrophysics Data System (ADS)

    Italiano, Giuseppe F.; Laura, Luigi; Santaroni, Federico

    Given a directed graph G, an edge is a strong bridge if its removal increases the number of strongly connected components of G. Similarly, we say that a vertex is a strong articulation point if its removal increases the number of strongly connected components of G. In this paper, we present linear-time algorithms for computing all the strong bridges and all the strong articulation points of directed graphs, solving an open problem posed in [2].

  7. Sinkage and slippage estimation for an articulated vehicle

    NASA Astrophysics Data System (ADS)

    Wilcox, Brian H.

    2002-07-01

    This paper describes an approach to estimating in real-time the degree to which an articulated robotic vehicle is undergoing wheel slip and/or sinkage in soft terrain. Robotic vehicles generally have hazard avoidance sensors which measure the shape of the sensible surface, and these can be used to predict what the articulation pose of the vehicle will be as it moves over the surface. An articulated vehicle (one with three or more wheels on each side) can directly measure the shape of the loadbearing surface by combining inclination and articulation sensing. Delays between the actual articulations and the expectations can be explained by wheel slippage. Differences between the expectation and the actual articulations can be explained by sinkage below the sensed surface. If one assumes that successive wheels on each side follow the same profile as the front wheel (sinking the same amount, if any, into the soil), then it is possible to estimate sinkage and slippage separately. A Maximum-A-Posteriori estimation procedure formalizing this heuristic approach is developed and simulated, and the results presented and discussed.

  8. Weaker dental enamel explains dental decay.

    PubMed

    Vieira, Alexandre R; Gibson, Carolyn W; Deeley, Kathleen; Xue, Hui; Li, Yong

    2015-01-01

    Dental caries continues to be the most prevalent bacteria-mediated non-contagious disease of humankind. Dental professionals assert the disease can be explained by poor oral hygiene and a diet rich in sugars but this does not account for caries free individuals exposed to the same risk factors. In order to test the hypothesis that amount of amelogenin during enamel development can influence caries susceptibility, we generated multiple strains of mice with varying levels of available amelogenin during dental development. Mechanical tests showed that dental enamel developed with less amelogenin is "weaker" while the dental enamel of animals over-expressing amelogenin appears to be more resistant to acid dissolution.

  9. Dental education in Colombia

    PubMed Central

    Jaramillo, Jorge A.; Pulido, Jairo H. Ternera; Núñez, Jaime A. Castro; Bird, William F.; Komabayashi, Takashi

    2014-01-01

    This article describes Colombia's development of formal dentistry, its dental school system, curriculum, and dental licensure, and current issues in oral health care. In 1969, there were only 4 dental schools in Colombia; at this writing there are 21. Five dental schools are public and the other 16 are private. Nearly all classes are conducted in Spanish. Undergraduate pre-dental coursework is not a prerequisite for dental school in Colombia. To obtain licensure, Colombian dental students must complete 5 years of study in dental school, earn a diploma, and work for the government for 1 year. There are approximately 41,400 dentists in Colombia, and the number is increasing quickly. However, the unemployment rate among dentists is very high, even though graduation from dental school is extremely difficult. Although the 1,100:1 ratio of citizens to dentists is considered satisfactory, access to dental care is limited due to the high rate of poverty. PMID:20339245

  10. Atypical Forensic Dental Identifications.

    PubMed

    Cardoza, Anthony R; Wood, James D

    2015-06-01

    Forensic dental identification specialists are typically the last conventional option for postmortem identification. Forensic dental identification is most often accomplished by comparing radiographs of the decedent's teeth with the dental radiographs obtained from the dentist of the suspected victim. Unfortunately, antemortem dental radiographs are not always available. When presented with this challenge, the authors of this article have been successful in completing identifications using means other than dental radiographic comparison. PMID:26126345

  11. Atypical Forensic Dental Identifications.

    PubMed

    Cardoza, Anthony R; Wood, James D

    2015-06-01

    Forensic dental identification specialists are typically the last conventional option for postmortem identification. Forensic dental identification is most often accomplished by comparing radiographs of the decedent's teeth with the dental radiographs obtained from the dentist of the suspected victim. Unfortunately, antemortem dental radiographs are not always available. When presented with this challenge, the authors of this article have been successful in completing identifications using means other than dental radiographic comparison.

  12. A newer technique to program a semi adjustable articulator

    PubMed Central

    Venkateshwaran, R.; Karthigeyan, Suma; Manoharan, P. S.; Konchada, Jagadish; Ramaswamy, Manikandan; Bhuminathan

    2014-01-01

    Introduction: The difficulty in reproducing accurate angle of condylar guidance in semi-adjustable articulators. Purpose: The purpose of this study was to determine the correlation between the angle of horizontal condylar inclination obtained on a semi-adjustable articulator and the corresponding angle traced on a temporomandibular joint (TMJ) radiograph in completely edentulous subject. Materials and Methods: The horizontal condylar inclination angle was obtained in a semi-adjustable articulator by means of height tracer (extra oral tracing device) and interocclusal records to program the articulator in 21 subjects. TMJ radiograph were recorded by the same operator with same orthopantomogram (OPG) machine (planmeca). Tracings of inclines of articular eminence on the radiograph were compared with the angle obtained on a semi-adjustable articulator. Each measurement was made using manual methods of measuring angle. The results were subjected to the Pearson correlation statistical analysis (α =0.01). Results: The outline of the articular eminence in a TMJ tomogram radiographic image was identified and traced. A significant correlation was found between the horizontal condylar inclination on a semi-adjustable and the corresponding TMJ tomogram radiographic image for both right (R = 0.789; P = 0.001) and left (i = 0.747; P = 0.004) sides. Conclusion: The articular eminence traced on a TMJ tomogram image represents the horizontal condylar inclination with a mean difference of 5° in 21 subjects evaluated. PMID:25210356

  13. Articulated open nozzle high pressure unit fuel injector

    SciTech Connect

    Perr, J.P.

    1991-12-31

    This patent describes an open nozzle unit fuel injector for use in an internal combustion engine of the type having a drive train associated with each unit injector to synchronously control each unit injector. It comprises an injector body having an axial bore open from an end of the injector body and at least one injection orifice passing through a tip of the cup from the axial bore, a plunger assembly reciprocably movably disposed within the axial bore for movement between a retracted position and an advanced position under the influence of a drive train to be associated with the unit fuel injector, the plunger assembly including a plunger, an articulated tip, a connection means for connecting the articulated tip to the plunger while permitting axial movement therebetween and for allowing pressure of a trapped volume of fuel between the plunger and the articulated tip to hold the articulated tip in a closed position following termination of an injection event so as to avoid secondary injection, and a means for absorbing an over-travel imparted to the plunger by the associated drive train such that the pressure of the trapped volume of fuel is regulated without the provision of means for spilling the trapped volume, whereby the articulated tip does not experience the over-travel.

  14. Dental hyponatraemia.

    PubMed

    Simpson, R M

    2011-08-01

    A 14-year-old girl developed dental pain and was treated for acute infected pulpitis of her right upper lateral incisor with drilling and filling. The pain continued and was helped by analgesia, sucking ice cubes and drinking cold water. Forty-eight hours later, she became confused and disoriented. She started to vomit and complained of headache. Investigations revealed hyponatraemia with normal serum potassium levels and initially normal urinary sodium excretion. Over the next 24 hours, she passed 5.45 L of urine and her serum sodium rose from 125 to 143 mmol/L. Self-induced water intoxication has been described during drinking games and initiation ceremonies, but this would appear to an unusual cause. Conservative management proved successful in allowing this girl to recover without sequelae. PMID:21873727

  15. Articulation of undergraduate and graduate education in public health.

    PubMed

    Lee, Joel M

    2008-01-01

    The rapid growth of individual undergraduate courses, minors, and baccalaureate degrees in public health presents a new issue for graduate public health education: how does a graduate or professional program address previously completed undergraduate public health course work? A review of college directories found listings for 154 North American baccalaureate degrees in public health, public health education, and public health nursing. This article addresses the purposes of public health undergraduate education as (1) general liberal arts education, (2) education complementary to other non-public health graduate degrees, (3) preprofessional education, and (4) professional education preparing undergraduates for entry-level careers. Following a discussion of reasons to consider articulation of undergraduate and graduate degrees, as well as barriers to articulation, the article presents potential strategies for articulation and future issues to consider in addressing admission of undergraduate public health students to master of public health programs.

  16. Design of a singularity-free articulated arm subassembly

    SciTech Connect

    Remis, S.J.; Stanisic, M.M. . Aerospace and Mechanical Engineering Dept.)

    1993-12-01

    Adding a redundant degree of freedom to the shoulder pointing system complex of an articulated arm subassembly makes it possible to achieve a maximal workspace that is free of singularities. This paper derives a functional constraint between three of the four joints of this new type of arm, achieving a singularity-free workspace encompassing the entire reachable volume between the maximal- and minimal-reach surfaces. The large volume of dexterous workspace is verified by animation of the resulting arm design. Graphical results from the animation are presented comparing the dexterous workspace of this new arm to that of the standard nonredundant articulated arm subassembly such as found in the Puma manipulator.

  17. [Determination and practical application of articulator related individual functional parameters. New method of measurement: virtual articulator and face-bow].

    PubMed

    Géza, Kiss; Péter, Kiss; Miklós, Pácz

    2007-06-01

    The aim of each occlusal surface reconstruction is to take the functionally developed biomorphologic aspects into consideration while restoring occlusal conditions. In order to fulfil these conditions, it is necessary to represent individual mandible movement as accurately as possible. In addition to physiological knowledge, it is indispensable for us to be able to simulate spatial mandible movement and determine individual parameters in an utmost precise way. By correcting projecting mistakes, the articulator should reproduce static and dynamic occlusal conditions according to reality. This is a difficult task. The advance of technology, spreading of computers and the idea of 'virtual articulator' have all helped to fulfil all these conditions by quick digital data processing instead of complicated and slow mechanical gadgets. The aim of our publication is to present the programming possibilities of the articulator of individual value belonging to the system and the advantages of the method.

  18. Dental Auxiliary Occupations. Interim Report.

    ERIC Educational Resources Information Center

    Kingston, Richard D.

    As part of a dental auxiliaries project, a Dental Auxiliary National Technical Advisory Committee was established, and its major undertaking was to assist in the development of a functional inventory for each of the three dental auxiliary occupations (dental assisting, dental hygiene, and dental laboratory technology). The analysis consisted of…

  19. American Dental Education Association

    MedlinePlus

    ... Diversity and Inclusion ADEA Commission on Change and Innovation in Dental Education What is ADEA CCI? ADEA ... Education, 2016–2017 Beyond the Crossroads: Change and Innovation in Dental Education ADEA Guidelines for Ethical Academic ...

  20. Dental x-rays

    MedlinePlus

    X-ray - teeth; Radiograph - dental; Bitewings; Periapical film; Panoramic film; Digital image ... dentist's office. There are many types of dental x-rays. Some of them are: Bitewing. Shows the crown ...

  1. Stuart Hall and the Theory and Practice of Articulation

    ERIC Educational Resources Information Center

    Clarke, John

    2015-01-01

    In this article, I argue that the idea of articulation links three different dimensions of Stuart Hall's work: it is central to the work of cultural politics, to the work of hegemony and to his practice of embodied pedagogy. I claim that his approach to pedagogy entails the art of listening combined with the practice of theorising in the service…

  2. Frequency of Consonant Articulation Errors in Dysarthric Speech

    ERIC Educational Resources Information Center

    Kim, Heejin; Martin, Katie; Hasegawa-Johnson, Mark; Perlman, Adrienne

    2010-01-01

    This paper analyses consonant articulation errors in dysarthric speech produced by seven American-English native speakers with cerebral palsy. Twenty-three consonant phonemes were transcribed with diacritics as necessary in order to represent non-phoneme misarticulations. Error frequencies were examined with respect to six variables: articulatory…

  3. Identifying Individual Excellence: The Dependable Strengths Articulation Process.

    ERIC Educational Resources Information Center

    Boivin-Brown, Allen; Haldane, Jean; Forster, Jerald

    This paper was written to describe the essential tasks of a process known as Dependable Strengths Articulation (DSA) and how career development practitioners can acquire the skills to use the process. DSA, when combined with practices known as Job Magnet, helps participants identify their individual excellence and then use this knowledge to…

  4. Articulated Multimedia Physics, Lesson 8, The Laws of Motion.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the eighth lesson of the Articulated Multimedia Physics Course, instructional materials are presented in this study guide with relation to the laws of motion. The topics are concerned with the relation between force, dynamic properties of objects, and Newton's laws. The content is arranged in scrambled form, and the use of matrix transparencies…

  5. Air Conditioning and Refrigeration Program Articulation, 1981-1982.

    ERIC Educational Resources Information Center

    Dallas County Community Coll. District, TX.

    Based on a survey of high school programs and courses in the Dallas County Community College District (DCCCD), this articulated program is designed to prepare students for entry-level employment in the air conditioning and refrigeration industry, including residential and commercial air conditioning and commercial refrigeration. The skills and…

  6. College Student Access: How Articulation Agreements Support Rural Students

    ERIC Educational Resources Information Center

    Jaeger, Audrey J.; Dunstan, Stephany Brett; Dixon, Karrie Gibson

    2015-01-01

    Students from rural areas face additional burdens, such as affordability, academic preparation, and lack of college-going resources that make seeking, enrolling, and attending college more difficult. Community colleges offer hope to achieve a college degree for many rural students, and well-developed articulation agreements can be one way of…

  7. PAATCH: Program of Auditory Articulation Therapy for Children.

    ERIC Educational Resources Information Center

    Hill, Diane Pagnotto

    This manual describes auditory training activities that de-emphasize production work for articulation-impaired preschoolers. The goal of these activities is to remove the burden of producing sounds so that the clinician can train the child's ear so that the child will eventually be ready and able to produce sounds at an age-appropriate level. The…

  8. Family History in Patients Who Present with Functional Articulation Disorders

    ERIC Educational Resources Information Center

    Alaraifi, Jehad Ahmad; Kamal, Sana Mohammed; Qa'dan, Wa'el Nafith; Haj-Tas, Maisa Atef

    2014-01-01

    This study aimed to examine family history of functional articulation disorders (FAD) among Jordanian patients who present with FAD, as well as to investigate the relation of other factors related to the disorder (age, gender, genetic connection between parents, sounds affected, and type of disorder). A convenience sample of 45 patients (ages…

  9. The Pump-Valve Model of Speech Articulation.

    ERIC Educational Resources Information Center

    Dew, Donald

    The traditional respiration-phonation-articulation-resonation model of speech production which permeates introductory literature is not the only suitable model of this process. The pump-valve model, which derives from the acoustic theory of speech production, is a viable alternative. This newer model is also consistent with modern theories. It…

  10. The Effect of Articulation Style on Perception of Modulated Tempo

    ERIC Educational Resources Information Center

    Geringer, John M.; Madsen, Clifford K.; MacLeod, Rebecca B.; Kevin Droe

    2006-01-01

    We investigated the effect of legato and staccato articulation styles on the perception of modulated tempos. Ninety music majors served as participants. Listeners heard music examples that had been selected from two pieces, each of which included staccato and legato passages. Excerpts were presented to listeners in three conditions of tempo…

  11. The Illinois Articulation Initiative: The Transferable General Education Core Curriculum.

    ERIC Educational Resources Information Center

    Illinois State Board of Higher Education, Springfield.

    The Illinois Board of Higher Education has endorsed a four-step plan to accelerate implementation of its policies on transfer and articulation. The plan involved calling for all community colleges to adopt the Illinois Community College Board's (ICCB's) Model Associate in Arts (AA) and Associate in Science (AS) Degree Requirements; developing a…

  12. Survey of Speech Articulation Disorders Among Military Dependent Children.

    ERIC Educational Resources Information Center

    Gordon, Don E.

    Reported was a study involving 20,000 (army) military dependent children (MDC) attending 75 schools in seven school systems throughout the continental United States during 1971. Testing of 412 randomly selected MDC using the Goldman-Fristoe Test of Articulation revealed a significant correlation and associative factor between MDC speech…

  13. College Level One: Articulation, Equity, and Literacy Issues. Workshop Report.

    ERIC Educational Resources Information Center

    Bisgaard, Soren; Brillhart, Lia V.; Burgess, Ann B.; Cramer, Jane Harris; Denton, Denice D.; Downer, Janice D.; Dunwoody, Sharon L.; Ellis, Arthur B.; Hewson, Peter W.; Secada, Walter G.; Tobias, Sheila

    This document reports on a workshop entitled "Articulation, Equity, and Literacy Issues" hosted by the College Level One (CL-1) project of the National Institute for Science Education (NISE). CL-1 identifies important issues in undergraduate education and determines the best strategies for addressing them. Workshop discussions examine curriculum…

  14. Articulated Multimedia Physics, Lesson 13, Internal Energy, Heat, and Temperature.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the thirteenth lesson of the Articulated Multimedia Physics Course, instructional materials are presented in this study guide with relation to internal energy, heat, and temperature. The topics are concerned with collisions, thermometers, friction forces, degrees Centigrade and Fahrenheit, calories, Brownian motion, and state changes. The…

  15. Frida Kahlo: Visual Articulations of Suffering and Loss.

    ERIC Educational Resources Information Center

    Nixon, Lois LaCivita

    1996-01-01

    Illustrates the value of interdisciplinary approaches to patient care by exploring visual articulations of suffering as rendered by one artist. Makes general observations about the nature of humanities courses offered to medical students and depicts a visual portrayal of an illness story representing personal perspectives about patient suffering…

  16. Theme: Tech Prep--Articulation, Curriculum Change, Implementation Strategies.

    ERIC Educational Resources Information Center

    Thuemmel, William L.; And Others

    1994-01-01

    Theme issue includes the following: "Tech Prep (TP)--Articulation Check!" (Thuemmel); "Delivering an Education That Works" (Perry); "TP: A Flood of Change" (Mahler, Vold); "Implementation Strategies for TP" (Harris, Birkenholz); and "Making Transitions in Agricultural Education through TP" (Sutphin). (SK)

  17. CURRICULUM ARTICULATION IN FOREIGN LANGUAGES, GRADES FOUR THROUGH TWELVE.

    ERIC Educational Resources Information Center

    RUSSO, BEN J.

    AN ORGANIZATIONAL PLAN BASED ON THE USE OF SCHEDULE MODULES OFFERS A SYSTEMATIC APPROACH TO THE DEVELOPMENT OF A WELL-ARTICULATED FOREIGN LANGUAGE PROGRAM FROM ELEMENTARY THROUGH HIGH SCHOOL. A THREE-TRACK SEQUENCE IS SUITABLE FOR SCHOOL DISTRICTS WISHING TO PROVIDE SUCH A PROGRAM. WITH THIS PLAN STUDENTS CAN BEGIN FOREIGN LANGUAGE STUDY IN GRADE…

  18. Articulation Rate in Childhood and Adolescence: Hebrew Speakers

    ERIC Educational Resources Information Center

    Amir, Ofer; Grinfeld, Doreen

    2011-01-01

    This study aimed to quantify articulation rate among Hebrew speaking children and adolescents across a wide age range, and to assess whether age-related differences vary according to metric. One hundred and forty children, in seven age groups, participated in this cross-sectional study. All children were recorded during conversation and a picture…

  19. Explaining Behavior through Observational Investigation and Theory Articulation

    ERIC Educational Resources Information Center

    Smith, Brian K.; Reiser, Brian J.

    2005-01-01

    Conducting observational investigations of behaviors and processes is an important method for generating scientific knowledge. This article describes a methodology for assisting students in the processes of observational inquiry and theory articulation and its instantiation in a set of digital video tools. We describe a high school biology…

  20. Explaining Behavior Through Observational Investigation and Theory Articulation

    ERIC Educational Resources Information Center

    Smith, Brian K.; Reiser, Brian J.

    2005-01-01

    Conducting observational investigations of behaviors and processes is an important method for generating scientific knowledge. This article describes a methodology for assisting students in the processes of observational inquiry and theory articulation and its instantiation in a set of digital video tools. We describe a high school biology…

  1. Forest Technician. 2+2 Articulated Curriculum in Agricultural Technology.

    ERIC Educational Resources Information Center

    York, Walter

    This 2+2 articulated curriculum for the occupation of forest technician includes the following: program results and benefits; job description--forest technician; curriculum objective; duty and task listings for forest technician; recommended secondary and postsecondary course options flowchart; recommended student prerequisites; basic outlines for…

  2. Articulated Multimedia Physics, Lesson 1, Measurement and Unit Systems.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the first lesson of the Articulated Multimedia Physics Course, instructional materials are presented in this study guide with relation to measurement and unit systems. An introduction is given for the realm of mechanics. The subject content is provided in scrambled form, and the use of matrix transparencies is required for students to control…

  3. ARTICULATOR-RELATED REGISTRATION AND ANALYSIS OF SAGITTAL CONDYLAR INCLINATION.

    PubMed

    Cimić, Samir; Simunković, Sonja Kraljević; Suncana Simonić Kocijan; Matijević, Jurica; Dulcić, Niksa; Catić, Amir

    2015-12-01

    The purpose of this investigation was to study sagittal condylar inclination values within a uniform sample (Angle class I occlusion) using 'articulator-related registration' and Camper's plane as a reference plane. The study was performed on a sample of 58 Angle class I subjects (mean age 25.1, SD 3.1). Measurements were performed with an ultrasonic jaw tracking device with six degrees of freedom. After a paraocclusal tray was fixed in the mouth, each subject had to make three protrusive movements and three right and left laterotrusive movements. From protrusive movements the software of the device automatically calculated the left and the right sagittal condylar inclination values used for setting of the articulator. The mean sagittal condylar inclinationvalue was 41.0° (SD 10.5) for the right joint and 40.7° (SD 9.8) for the left joint. The maximum value was 65.0° for the right and 68.6° for the left joint, and the minimum value was 13.7° for the right and 21.7° for the left joint. The results of this study suggested the average articulator setting for sagittal condylar inclination for fully dentate adult subjects to be 40° in relation to Camper's plane. This is especially important for the articulators that are set up in relation to Camper's plane.

  4. The Relationship of Intonation to First Vowel Articulation in Infants.

    ERIC Educational Resources Information Center

    Engel, Walburga von Raffler

    Assuming that an infant's first stage of verbal communication is melodic and the result of controlling the motion of the vocal cords, a question arises concerning the second stage in development. Is it the shaping of the oral cavity of the direction of the articulators? The author's observation of an infant through his first year of development…

  5. Visual Word Recognition during Reading Is Followed by Subvocal Articulation

    ERIC Educational Resources Information Center

    Eiter, Brianna M.; Inhoff, Albrecht W.

    2010-01-01

    Three experiments examined whether the identification of a visual word is followed by its subvocal articulation during reading. An irrelevant spoken word (ISW) that was identical, phonologically similar, or dissimilar to a visual target word was presented when the eyes moved to the target in the course of sentence reading. Sentence reading was…

  6. Grammatically Underdetermined Theme-Rheme Articulation. ROLIG Papir 49.

    ERIC Educational Resources Information Center

    Fretheim, Thorstein

    This study shows that utterances ending in an extra-clausal response particle provide interesting evidence in favor of the hypothesis that theme-rheme articulation in Norwegian utterances is grammatically underdetermined. First, a review of the approach used in the study of the functions of Norwegian intonational phrasing is provided. In this…

  7. Articulated Multimedia Physics, Lesson 11, Impulse and Momentum.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the eleventh lesson of the Articulated Multimedia Physics Course, instructional materials are presented in this study guide with relation to impulse and momentum. The topics are concerned with "quantity of motion," unit conversion, and related conservation laws. The content is arranged in scrambled form, and the use of matrix transparencies is…

  8. Trade and Industry Articulation Project: Final Report, 1981-82.

    ERIC Educational Resources Information Center

    Stewart, Betsy; And Others

    A project was undertaken at Cerritos College (CC) to establish a statewide model for the development of articulated trade and industry curriculum materials and methods that would allow students to move from the secondary to the college level without loss of time or resources. Six subject areas were chosen: auto body, automotive, drafting,…

  9. The Multidimensional Problem of Articulation and Transfer. ERIC Digest.

    ERIC Educational Resources Information Center

    Kintzer, Frederick C.

    Transfer (i.e., the movement of students and of their academic credits from one school to another) and articulation (i.e., services for transfer students) can no longer be thought of solely in terms of the linear progression of community college students to four-year institutions. While definitions and counting procedures vary considerably among…

  10. Articulated Multimedia Physics, Lesson 12, Work, Energy, and Power.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the twelfth lesson of the Articulated Multimedia Physics Course, instructional materials are presented in this study guide with relation to work, energy, and power. The topics are concerned with kinetic and potential energy, energy transfer in free falling bodies, and conservation laws. The content is arranged in scrambled form, and the use of…

  11. Articulating Domestic and Global University Descriptors and Indices of Excellence

    ERIC Educational Resources Information Center

    Lindsay, Beverly

    2012-01-01

    At the 2010 American Educational Research Association (AERA) annual conference, a featured invited session focused on "How professors think: inside the curious world of academic judgment." Harvard University professor and author, Michele Lamont, articulated a thoughtful precis of her book. Her material concentrates on the "curious" world of…

  12. Dental laser technology.

    PubMed

    Fasbinder, Dennis J

    2008-10-01

    Dental technology is rapidly affecting the treatment options available to patients. Dental lasers are an innovative technology for both hard- and soft-tissue treatment applications. The ability to recontour soft tissues efficiently and predictably with immediate hemostatsis and minimal postoperative sequelae is of value to both the dentist and the patient. This article reviews the principles of dental lasers, criteria to consider when selecting a dental laser, and some of their clinical applications.

  13. Vocal tract articulation revisited: the case of the monk parakeet

    PubMed Central

    Ohms, Verena R.; Beckers, Gabriël J. L.; ten Cate, Carel; Suthers, Roderick A.

    2012-01-01

    SUMMARY Birdsong and human speech share many features with respect to vocal learning and development. However, the vocal production mechanisms have long been considered to be distinct. The vocal organ of songbirds is more complex than the human larynx, leading to the hypothesis that vocal variation in birdsong originates mainly at the sound source, while in humans it is primarily due to vocal tract filtering. However, several recent studies have indicated the importance of vocal tract articulators such as the beak and oropharyngeal–esophageal cavity. In contrast to most other bird groups, parrots have a prominent tongue, raising the possibility that tongue movements may also be of significant importance in vocal production in parrots, but evidence is rare and observations often anecdotal. In the current study we used X-ray cinematographic imaging of naturally vocalizing monk parakeets (Myiopsitta monachus) to assess which articulators are possibly involved in vocal tract filtering in this species. We observed prominent tongue height changes, beak opening movements and tracheal length changes, which suggests that all of these components play an important role in modulating vocal tract resonance. Moreover, the observation of tracheal shortening as a vocal articulator in live birds has to our knowledge not been described before. We also found strong positive correlations between beak opening and amplitude as well as changes in tongue height and amplitude in several types of vocalization. Our results suggest considerable differences between parrot and songbird vocal production while at the same time the parrot's vocal articulation might more closely resemble human speech production in the sense that both make extensive use of the tongue as a vocal articulator. PMID:22162856

  14. Vocal tract articulation revisited: the case of the monk parakeet.

    PubMed

    Ohms, Verena R; Beckers, Gabriël J L; ten Cate, Carel; Suthers, Roderick A

    2012-01-01

    Birdsong and human speech share many features with respect to vocal learning and development. However, the vocal production mechanisms have long been considered to be distinct. The vocal organ of songbirds is more complex than the human larynx, leading to the hypothesis that vocal variation in birdsong originates mainly at the sound source, while in humans it is primarily due to vocal tract filtering. However, several recent studies have indicated the importance of vocal tract articulators such as the beak and oropharyngeal-esophageal cavity. In contrast to most other bird groups, parrots have a prominent tongue, raising the possibility that tongue movements may also be of significant importance in vocal production in parrots, but evidence is rare and observations often anecdotal. In the current study we used X-ray cinematographic imaging of naturally vocalizing monk parakeets (Myiopsitta monachus) to assess which articulators are possibly involved in vocal tract filtering in this species. We observed prominent tongue height changes, beak opening movements and tracheal length changes, which suggests that all of these components play an important role in modulating vocal tract resonance. Moreover, the observation of tracheal shortening as a vocal articulator in live birds has to our knowledge not been described before. We also found strong positive correlations between beak opening and amplitude as well as changes in tongue height and amplitude in several types of vocalization. Our results suggest considerable differences between parrot and songbird vocal production while at the same time the parrot's vocal articulation might more closely resemble human speech production in the sense that both make extensive use of the tongue as a vocal articulator.

  15. Accreditation in Dental Hygiene.

    ERIC Educational Resources Information Center

    National Commission on Accrediting, Washington, DC.

    The Council on Dental Education cooperates with the American Dental Hygienists' Association in developing educational requirements for schools of dental hygiene. To be eligible for accreditation, schools must operate on a non-profit basis. A school applying for accreditation completes a previsitation questionnaire concerning its program. The…

  16. Dental records: An overview

    PubMed Central

    Charangowda, B K

    2010-01-01

    Dental records consist of documents related to the history of present illness, clinical examination, diagnosis, treatment done, and the prognosis. A thorough knowledge of dental records is essential for the practicing dentist, as it not only has a forensic application, but also a legal implication with respect to insurance and consumerism. This article reviews the importance of dental records in forensics. PMID:21189983

  17. Dental Manpower Fact Book.

    ERIC Educational Resources Information Center

    Ake, James N.; Johnson, Donald W.

    Statistical data on many aspects of dental and allied dental personnel supply, distribution, characteristics, and education and on certain other aspects of dental services are presented and discussed. The data on dentist supply show the national trend in the supply of active dentists since 1950 and the concurrent changes in dentist-to-population…

  18. Dental Laboratory Technology.

    ERIC Educational Resources Information Center

    Department of the Air Force, Washington, DC.

    The Air Force dental laboratory technology manual is designed as a basic training text as well as a reference source for dental laboratory technicians, a specialty occupation concerned with the design, fabrication, and repair of dental prostheses. Numerous instructive diagrams and photographs are included throughout the manual. The comprehensive…

  19. DENTAL SCHOOL PLANNING.

    ERIC Educational Resources Information Center

    GALAGAN, DONALD J.

    THIS DISCUSSION PRESENTS A COMPLETE PICTURE OF THE CURRENT STATE OF DENTAL EDUCATION WITH SUGGESTIONS FOR MEETING THE DEMANDS FOR DENTAL STAFF AND FACILITIES. THE AREAS INVESTIGATED ARE (1) OBJECTIVES IN DENTAL EDUCATION--COURSES, TEACHING MODES, INNOVATIONS IN CURRICULUM, COORDINATION OF BASIC AND CLINICAL INSTRUCTION, (2) FACILITY…

  20. Weaker dental enamel explains dental decay.

    PubMed

    Vieira, Alexandre R; Gibson, Carolyn W; Deeley, Kathleen; Xue, Hui; Li, Yong

    2015-01-01

    Dental caries continues to be the most prevalent bacteria-mediated non-contagious disease of humankind. Dental professionals assert the disease can be explained by poor oral hygiene and a diet rich in sugars but this does not account for caries free individuals exposed to the same risk factors. In order to test the hypothesis that amount of amelogenin during enamel development can influence caries susceptibility, we generated multiple strains of mice with varying levels of available amelogenin during dental development. Mechanical tests showed that dental enamel developed with less amelogenin is "weaker" while the dental enamel of animals over-expressing amelogenin appears to be more resistant to acid dissolution. PMID:25885796

  1. Weaker Dental Enamel Explains Dental Decay

    PubMed Central

    Vieira, Alexandre R.; Gibson, Carolyn W.; Deeley, Kathleen; Xue, Hui; Li, Yong

    2015-01-01

    Dental caries continues to be the most prevalent bacteria-mediated non-contagious disease of humankind. Dental professionals assert the disease can be explained by poor oral hygiene and a diet rich in sugars but this does not account for caries free individuals exposed to the same risk factors. In order to test the hypothesis that amount of amelogenin during enamel development can influence caries susceptibility, we generated multiple strains of mice with varying levels of available amelogenin during dental development. Mechanical tests showed that dental enamel developed with less amelogenin is “weaker” while the dental enamel of animals over-expressing amelogenin appears to be more resistant to acid dissolution. PMID:25885796

  2. The pregnant dental patient.

    PubMed

    Singh, Medha

    2012-01-01

    When dealing with a pregnant patient, the dental practitioner should keep in mind the various physiological changes that occur in the pregnant female and the potential effects on the fetus in using various types of local anesthesia. This article reviews the current considerations in the use of local anesthesia in the pregnant dental patient, and the safety of local anesthetics, their dosage, and any adverse effect on mother and fetus. It also discusses various dental procedures and the trimester during which they can be performed. Lastly, this article talks about the complications that can occur with a pregnant dental patient in the dental chair.

  3. Description and Documentation of the Dental School Dental Delivery System.

    ERIC Educational Resources Information Center

    Chase, Rosen and Wallace, Inc., Alexandria, VA.

    A study was undertaken to describe and document the dental school dental delivery system using an integrated systems approach. In late 1976 and early 1977, a team of systems analysts and dental consultants visited three dental schools to observe the delivery of dental services and patient flow and to interview administrative staff and faculty.…

  4. Population ageing and dental care.

    PubMed

    Harford, Jane

    2009-04-01

    Population ageing is a fact in both developed and developing countries. The concern about population ageing largely arises from the combination of a greater number of older people requiring greater amounts of healthcare services and pensions, and relatively fewer people working to pay for them. Oral health and dental care are important aspects of health and health care. Lower rates of edentulism and an ageing population mean that older people will feature more prominently in dental services. Traditionally, economic studies of ageing have focused on the fiscal implications of ageing, projecting the increased burden on health and welfare services that accompanies ageing. It assumed that ageing is the major driver of recent changes and those past trends will simply be amplified by faster population ageing in the future. Less work has been done to understand other past drivers of increased healthcare spending and their implications for the future. The conclusion of these reports is usually that population ageing is unaffordable with current policy settings. They have proposed policies to deal with population ageing which focused on increasing workforce participation and worker productivity to increase the tax base and reducing entitlements. However, the affordability question is as much political as a numerical. There are no clearly articulated criteria for affordability and little opportunity for public discourse about what citizens are willing to pay in taxes to support an ageing population. While the reports do not necessarily reflect public opinion, they will certainly shape it. Predicting the future for oral health is more fraught than for general health, as oral health is in the midst of an epidemiological transition from high rates of edentulism and tooth loss to low rates. Changes in the pattern of dental expenditure in the past do not mirror the experience of rapid increases in per capita expenditure on older age groups as regards general health. Dentistry

  5. Design and Construction of Passively Articulated Ornithopter Wings

    NASA Astrophysics Data System (ADS)

    Mastro, Alexander Timothy

    Birds, bats, and insects are able to fly efficiently and execute impressive in-flight, landing, and takeoff maneuvers with apparent ease through actuation of their highly articulated wings. This contrasts the approach used to enable the flight of comparatively simple man-made rotary and fixed wing aircraft. The complex aerodynamics underlying flapping-based flight pose an everpresent challenge to scientists hoping to reveal the secrets of animal flight. Despite this, interest in engineering aircraft on the bird and insect scale is higher than ever. Herein, I present my attempt to design and construct bioinspired passively articulated ornithopter wings. Two different hinge-based joint design concepts are investigated across several design iterations. The advantages and disadvantages of each implementation are discussed. Finally, the necessary instrumentation to analyze the performance of the wings is designed and fabricated, followed by testing of the wings.

  6. Attitude Dynamics and Control of Solar Sails with Articulated Vanes

    NASA Technical Reports Server (NTRS)

    Mettler, Edward; Acikmese, A. Behcet; Ploen, Scott R.

    2005-01-01

    In this paper we develop a robust nonlinear algorithm for the attitude control of a solar sailcraft with M single degree-of-freedom articulated control vanes. A general attitude controller that tracks an admissible trajectory while rejecting disturbances such as torques due to center-of-mass to center-of-pressure offsets is applied to this problem. We then describe a methodology based on nonlinear programming to allocate the required control torques among the control vanes. A simplified allocation strategy is then applied to a solar sail with four articulated control vanes, and simulation results are given. The performance of the control algorithm and possible limitations of vane-only control are then discussed.

  7. Gender recognition from unconstrained and articulated human body.

    PubMed

    Wu, Qin; Guo, Guodong

    2014-01-01

    Gender recognition has many useful applications, ranging from business intelligence to image search and social activity analysis. Traditional research on gender recognition focuses on face images in a constrained environment. This paper proposes a method for gender recognition in articulated human body images acquired from an unconstrained environment in the real world. A systematic study of some critical issues in body-based gender recognition, such as which body parts are informative, how many body parts are needed to combine together, and what representations are good for articulated body-based gender recognition, is also presented. This paper also pursues data fusion schemes and efficient feature dimensionality reduction based on the partial least squares estimation. Extensive experiments are performed on two unconstrained databases which have not been explored before for gender recognition.

  8. Cerec omnicam and the virtual articulator--a case report.

    PubMed

    Fritzsche, G

    2013-01-01

    This case report demonstrates how two opposing teeth were restored with full crowns using Cerec software version 4.2 (pre-release version). In addition, an anterior tooth was provided with a veneer. The situation was scanned with the Cerec Omnicam. The new virtual articulator was used for the design to obtain correct dynamic contacts. The Cerec Omnicam can scan the entire situation prior to preparation without the help of an assistant, as no surface pretreatment is necessary. The locations of the occlusal contacts can be marked with articulating paper and are indicated on the virtual models. Selective deletion of individual areas allows the prepared teeth to be rescanned, considerably speeding up the workflow. A video demonstration is available of the acquisition and design procedure.

  9. A survey of degree completion programs in dental hygiene education.

    PubMed

    Portillo, Karen M; Rogo, Ellen J; Calley, Kristin H; Cellucci, Leigh W

    2013-05-01

    The purpose of this descriptive study was to identify specific information related to U.S. dental hygiene baccalaureate degree completion programs. Learning experiences, assessment methods, and baccalaureate institutional partnerships were assessed. Of the sixty dental hygiene programs that offer a degree completion program, the forty-two that met the inclusion criteria (including having operated for at least three years) were invited to participate in a thirty-eight item online survey. A 62 percent (n=26) response rate was obtained. Learning experiences in responding programs included core dental hygiene courses, general education courses, and elective dental hygiene courses. Emphasis areas offered by various programs were in the specialty areas of education, public or community health, and research. Respondents reported that their graduates were employed in multiple settings (65 percent; n=17), with 19 percent (n=5) reporting employment in the combined grouping of private practice, education, and public health. Institutional partnerships included articulation agreements (88 percent; n=21), community college baccalaureate (8 percent; n=2), and university extension (4 percent; n=1) models. The findings of this study provide a baseline for assessing the educational composition and design of U.S. dental hygiene degree completion programs. However, results of this study showed inconsistencies among learning experiences that might raise concerns when considering students' level of preparation for graduate education and future leadership roles in the profession.

  10. Parameter and state estimation for articulated heavy vehicles

    NASA Astrophysics Data System (ADS)

    Cheng, Caizhen; Cebon, David

    2011-02-01

    This article discusses algorithms to estimate parameters and states of articulated heavy vehicles. First, 3- and 5-degrees-of-freedom linear vehicle models of a tractor semitrailer are presented. Vehicle parameter estimation methods based on the dual extended Kalman filter and state estimation based on the Kalman filter are presented. A program of experimental tests on an instrumental heavy goods vehicle is described. Simulation and experimental results showed that the algorithms generate accurate estimates of vehicle parameters and states under most circumstances.

  11. Efficient Reorientation Maneuvers for Spacecraft with Multiple Articulated Payloads

    NASA Technical Reports Server (NTRS)

    Mcclamroch, N. Harris

    1993-01-01

    A final report is provided which describes the research program during the period 3 Mar. 1992 to 3 Jun. 1993. A summary of the technical research questions that were studied and of the main results that were obtained is given. The specific outcomes of the research program, including both educational impacts as well as research publications, are listed. The research is concerned with efficient reorientation maneuvers for spacecraft with multiple articulated payloads.

  12. The Future of Dental Education.

    ERIC Educational Resources Information Center

    Simonsen, Richard J.

    1994-01-01

    The author, a representative of the American Dental Trade Association, identifies major challenges facing dental education in the areas of predoctoral dental education, postdoctoral dental education, and continuing dental education. Ten recommendations address preclinical and clinical courses, licensing examinations, mandatory continuing…

  13. [Conceptual parameters of the facial arc and articulators adapted for black Africans].

    PubMed

    N'Dindin, A C; Djeredou, K B; N'Dindin-Guinan, B; Assi, K D

    2005-12-01

    Articulators and facial arc always used in dentistry are not adapted to African black people. Their use provokes many errors in the setting of models on articulators. In this work, authors propose facial arc and articulator parameters conceptions that are suited to black Africans.

  14. Trends in Articulation Arrangements for Technical and Vocational Education in the South East Asian Region.

    ERIC Educational Resources Information Center

    Haas, Adrian R.

    Trends in articulation arrangements for technical and vocational education (TVE) in the South East Asia region were studied. A key feature of articulation is the existence of pathways that allow graduates of one course of study to progress to other courses. Effective articulation opens up advancement for individuals and helps to create a flexible…

  15. Locus equations are an acoustic expression of articulator synergy

    PubMed Central

    Iskarous, Khalil; Fowler, Carol A.; Whalen, D. H.

    2010-01-01

    The study investigated the articulatory basis of locus equations, regression lines relating F2 at the start of a Consonant-Vowel (CV) transition to F2 at the middle of the vowel, with C fixed and V varying. Several studies have shown that consonants of different places of articulation have locus equation slopes that descend from labial to velar to alveolar, and intercept magnitudes that increase in the opposite order. Using formulas from the theory of bivariate regression that express regression slopes and intercepts in terms of standard deviations and averages of the variables, it is shown that the slope directly encodes a well-established measure of coarticulation resistance. It is also shown that intercepts are directly related to the degree to which the tongue body assists the formation of the constriction for the consonant. Moreover, it is shown that the linearity of locus equations and the linear relation between locus equation slopes and intercepts originates in linearity in articulation between the horizontal position of the tongue dorsum in the consonant and to that in the vowel. It is concluded that slopes and intercepts of acoustic locus equations are measures of articulator synergy. PMID:20968373

  16. Compliant articulation structure using superelastic NiTiNOL

    NASA Astrophysics Data System (ADS)

    Liu, Jiening; Hall, Benjamin; Frecker, Mary; Reutzel, Edward W.

    2013-09-01

    A device that can provide articulation to surgical tool tips is needed in natural orifice transluminal endoscopy surgery (NOTES). In this paper, we propose a compliant articulation structure that uses superelastic NiTiNOL to achieve a large deflection angle and force in a compact size. Six geometric parameters are used to define this structure, and constraints based on the fabrication process are imposed. Using finite element analysis, a family of designs is evaluated in terms of the free deflection angle and blocked force. The same family of designs is evaluated for both NiTiNOL and stainless steel. It can be seen that significant benefits are observed when using NiTiNOL compared to 316 stainless steel; a maximum free deflection angle of 64.8° and maximum blocked force of 24.7 N are predicted. The structures are designed to avoid stress concentrations, and design guidelines are recommended. The meso-scale articulation structure is fabricated using both a Coherent Avia Q-switched, 355 nm laser and a Myachi Unitek 200 W single mode pulsed fiber laser with active water cooling. Select fabricated structures are then tested to validate the finite element models.

  17. Primary face motor area as the motor representation of articulation.

    PubMed

    Terao, Yasuo; Ugawa, Yoshikazu; Yamamoto, Tomotaka; Sakurai, Yasuhisa; Masumoto, Tomohiko; Abe, Osamu; Masutani, Yoshitaka; Aoki, Shigeki; Tsuji, Shoji

    2007-04-01

    No clinical data have yet been presented to show that a lesion localized to the primary motor area (M1) can cause severe transient impairment of articulation, although a motor representation for articulation has been suggested to exist within M1. Here we describe three cases of patients who developed severe dysarthria, temporarily mimicking speech arrest or aphemia, due to a localized brain lesion near the left face representation of the human primary motor cortex (face-M1). Speech was slow, effortful, lacking normal prosody, and more affected than expected from the degree of facial or tongue palsy. There was a mild deficit in tongue movements in the sagittal plane that impaired palatolingual contact and rapid tongue movements. The speech disturbance was limited to verbal output, without aphasia or orofacial apraxia. Overlay of magnetic resonance images revealed a localized cortical region near face-M1, which displayed high intensity on diffusion weighted images, while the main portion of the corticobulbar fibers arising from the lower third of the motor cortex was preserved. The cases suggest the existence of a localized brain region specialized for articulation near face-M1. Cortico-cortical fibers connecting face-M1 with the lower premotor areas including Broca's area may also be important for articulatory control. PMID:17380243

  18. Functional Organization of Human Sensorimotor Cortex for Speech Articulation

    PubMed Central

    Bouchard, Kristofer E.; Mesgarani, Nima; Johnson, Keith; Chang, Edward F.

    2013-01-01

    Speaking is one of the most complex actions we perform, yet nearly all of us learn to do it effortlessly. Production of fluent speech requires the precise, coordinated movement of multiple articulators (e.g., lips, jaw, tongue, larynx) over rapid time scales. Here, we used high-resolution, multi-electrode cortical recordings during the production of consonant-vowel syllables to determine the organization of speech sensorimotor cortex in humans. We found speech articulator representations that were somatotopically arranged on ventral pre- and post-central gyri and partially overlapping at individual electrodes. These representations were temporally coordinated as sequences during syllable production. Spatial patterns of cortical activity revealed an emergent, population-level representation, which was organized by phonetic features. Over tens of milliseconds, the spatial patterns transitioned between distinct representations for different consonants and vowels. These results reveal the dynamic organization of speech sensorimotor cortex during the generation of multi-articulator movements underlying our ability to speak. PMID:23426266

  19. Visual word recognition during reading is followed by subvocal articulation.

    PubMed

    Eiter, Brianna M; Inhoff, Albrecht W

    2010-03-01

    Three experiments examined whether the identification of a visual word is followed by its subvocal articulation during reading. An irrelevant spoken word (ISW) that was identical, phonologically similar, or dissimilar to a visual target word was presented when the eyes moved to the target in the course of sentence reading. Sentence reading was further accompanied by either a sequential finger tapping task (Experiment 1) or an articulatory suppression task (Experiment 2). Experiment 1 revealed sound-specific interference from a phonologically similar ISW during posttarget viewing. This interference was absent in Experiment 2, where similar and dissimilar ISWs impeded target and posttarget reading equally. Experiment 3 showed that articulatory suppression left the lexical processing of visual words intact and that it did not diminish the influence of visual word recognition on eye guidance. The presence of sound-specific interference during posttarget reading in Experiment 1 is attributed to deleterious effects of a phonologically similar ISW on the subvocal articulation of a target. Its absence in Experiment 2 is attributed to the suppression of a target's subvocal articulation. PMID:20192542

  20. What is dental ecology?

    PubMed

    Cuozzo, Frank P; Sauther, Michelle L

    2012-06-01

    Teeth have long been used as indicators of primate ecology. Early work focused on the links between dental morphology, diet, and behavior, with more recent years emphasizing dental wear, microstructure, development, and biogeochemistry, to understand primate ecology. Our study of Lemur catta at the Beza Mahafaly Special Reserve, Madagascar, has revealed an unusual pattern of severe tooth wear and frequent tooth loss, primarily the result of consuming a fallback food for which these primates are not dentally adapted. Interpreting these data was only possible by combining our areas of expertise (dental anatomy [FC] and primate ecology [MS]). By integrating theoretical, methodological, and applied aspects of both areas of research, we adopted the term "dental ecology"-defined as the broad study of how teeth respond to the environment. Specifically, we view dental ecology as an interpretive framework using teeth as a vehicle for understanding an organism's ecology, which builds upon earlier work, but creates a new synthesis of anatomy and ecology that is only possible with detailed knowledge of living primates. This framework includes (1) identifying patterns of dental pathology and tooth use-wear, within the context of feeding ecology, behavior, habitat variation, and anthropogenic change, (2) assessing ways in which dental development and biogeochemical signals can reflect habitat, environmental change and/or stress, and (3) how dental microstructure and macro-morphology are adapted to, and reflect feeding ecology. Here we define dental ecology, provide a short summary of the development of this perspective, and place our new work into this context.

  1. Dental hygiene in Slovakia.

    PubMed

    Luciak-Donsberger, C; Krizanová, M

    2004-08-01

    This article reports on the development of the dental hygiene profession in Slovakia from a global perspective. The aim is to inform about current developments and to examine, how access to qualified dental hygiene care might be improved and how professional challenges might be met. For an international study on dental hygiene, secondary source data were obtained from members of the House of Delegates of the International Federation of Dental Hygienists (IFDH) or by fax and e-mail from experts involved in the national professional and educational organization of dental hygiene in non-IFDH member countries, such as Slovakia. Responses were followed-up by interviews, e-mail correspondence, visits to international universities, and a review of supporting studies and reference literature. Results show that the introduction of dental hygiene in Slovakia in 1992 was inspired by the delivery of preventive care in Switzerland. Initiating local dentists and dental hygienists strive to attain a high educational level, equitable to that of countries in which dental hygiene has an established tradition of high quality care. Low access to qualified dental hygiene care may be a result of insufficient funding for preventive services, social and cultural lack of awareness of the benefits of preventive care, and of limitations inherent in the legal constraints preventing unsupervised dental hygiene practice. These may be a result of gender politics affecting a female-dominated profession and of a perception that dental hygiene is auxiliary to dental care. International comparison show that of all Eastern European countries, the dental hygiene profession appears most advanced in Slovakia. This is expressed in high evidence-based academic goals, in extensive work with international consultants from the Netherlands and Switzerland, in annual congresses of high professional quality, and in the establishment of a profession, which has not been introduced in all Western EU countries

  2. Meeting Dental Health Needs Through Dental Education

    ERIC Educational Resources Information Center

    Morris, Alvin L.

    1972-01-01

    Dental health needs of the country cannot be met through education of more dentists. Rather, we must educate auxiliaries to perform many of the intraoral procedures now regarded the sole responsibility of dentists. (SB)

  3. Employment of Dental Hygienists as Dental Educators.

    ERIC Educational Resources Information Center

    Fong, Cynthia; Odrich, Johanna

    1987-01-01

    A study of the use of dental hygienists to teach periodontics, preventive dentistry, community dentistry, and public health courses looked at employment patterns and practices and the qualifications of the teachers. (MSE)

  4. Case based dental radiology.

    PubMed

    Niemiec, Brook A

    2009-02-01

    Dental radiology is quickly becoming integral to the standard of care in veterinary dentistry. This is not only because it is critical for proper patient care, but also because client expectations have increased. Furthermore, providing dental radiographs as a routine service can create significant practice income. This article details numerous conditions that are indications for dental radiographs. As you will see, dental radiographs are often critical for proper diagnosis and treatment. These conditions should not be viewed as unusual; they are present within all of our practices. When you choose not to radiograph these teeth, you leave behind painful pathology. Utilizing the knowledge gained from dental radiographs will both improve patient care and increase acceptance of treatment recommendations. Consequently, this leads to increased numbers of dental procedures performed at your practice. PMID:19410233

  5. [Determination of dental age].

    PubMed

    Willems, Guy

    2005-01-01

    A review of the most commonly used dental age estimating techniques is generated. The most important issue for the forensic odontologist involved in dental age estimation is to employ as many of these methods as possible by performing repetitive measurements and calculations of different age-related parameters. That is the only way in order to try and establish reliable dental age estimations. In particular, a special chapter is attributed to the complex problem of determining the age of majority. PMID:16370435

  6. Dental Implant Systems

    PubMed Central

    Oshida, Yoshiki; Tuna, Elif B.; Aktören, Oya; Gençay, Koray

    2010-01-01

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

  7. Computer-aided dental prostheses construction using reverse engineering.

    PubMed

    Solaberrieta, E; Minguez, R; Barrenetxea, L; Sierra, E; Etxaniz, O

    2014-01-01

    The implementation of computer-aided design/computer-aided manufacturing (CAD/CAM) systems with virtual articulators, which take into account the kinematics, constitutes a breakthrough in the construction of customised dental prostheses. This paper presents a multidisciplinary protocol involving CAM techniques to produce dental prostheses. This protocol includes a step-by-step procedure using innovative reverse engineering technologies to transform completely virtual design processes into customised prostheses. A special emphasis is placed on a novel method that permits a virtual location of the models. The complete workflow includes the optical scanning of the patient, the use of reverse engineering software and, if necessary, the use of rapid prototyping to produce CAD temporary prostheses.

  8. Dynamics and control of robotic aircraft with articulated wings

    NASA Astrophysics Data System (ADS)

    Paranjape, Aditya Avinash

    There is a considerable interest in developing robotic aircraft, inspired by birds, for a variety of missions covering reconnaissance and surveillance. Flapping wing aircraft concepts have been put forth in light of the efficiency of flapping flight at small scales. These aircraft are naturally equipped with the ability to rotate their wings about the root, a form of wing articulation. This thesis covers some problems concerning the performance, stability and control of robotic aircraft with articulated wings in gliding flight. Specifically, we are interested in aircraft without a vertical tail, which would then use wing articulation for longitudinal as well as lateral-directional control. Although the dynamics and control of articulated wing aircraft share several common features with conventional fixed wing aircraft, the presence of wing articulation presents several unique benefits as well as limitations from the perspective of performance and control. One of the objective of this thesis is to understand these features using a combination of theoretical and numerical tools. The aircraft concept envisioned in this thesis uses the wing dihedral angles for longitudinal and lateral-directional control. Aircraft with flexible articulated wings are also investigated. We derive a complete nonlinear model of the flight dynamics incorporating dynamic CG location and the changing moment of inertia. We show that symmetric dihedral configuration, along with a conventional horizontal tail, can be used to control flight speed and flight path angle independently of each other. This characteristic is very useful for initiating an efficient perching maneuver. It is shown that wing dihedral angles alone can effectively regulate sideslip during rapid turns and generate a wide range of equilibrium turn rates while maintaining a constant flight speed and regulating sideslip. We compute the turning performance limitations that arise due to the use of wing dihedral for yaw control

  9. Occupational Program Articulation. A Report of a Study Prepared by the Task Force on Occupational Program Articulation. National Council for Occupational Education. Monograph Series Volume 12, Number 1.

    ERIC Educational Resources Information Center

    National Council for Occupational Education, Inc., Wausau, WI.

    In 1989, a survey was conducted of two-year postsecondary institutions to gather information designed to identify and define articulation activities, evaluate these articulation efforts, and identify model programs. The survey was mailed to 675 institutions, generating 205 usable responses for a response rate of 30%. Major findings of the survey…

  10. Simulation of dental collisions and occlusal dynamics in the virtual environment.

    PubMed

    Stavness, I K; Hannam, A G; Tobias, D L; Zhang, X

    2016-04-01

    Semi-adjustable articulators have often been used to simulate occlusal dynamics, but advances in intra-oral scanning and computer software now enable dynamics to be modelled mathematically. Computer simulation of occlusal dynamics requires accurate virtual casts, records to register them and methods to handle mesh collisions during movement. Here, physical casts in a semi-adjustable articulator were scanned with a conventional clinical intra-oral scanner. A coordinate measuring machine was used to index their positions in intercuspation, protrusion, right and left laterotrusion, and to model features of the articulator. Penetrations between the indexed meshes were identified and resolved using restitution forces, and the final registrations were verified by distance measurements between dental landmarks at multiple sites. These sites were confirmed as closely approximating via measurements made from homologous transilluminated vinylpolysiloxane interocclusal impressions in the mounted casts. Movements between the indexed positions were simulated with two models in a custom biomechanical software platform. In model DENTAL, 6 degree-of-freedom movements were made to minimise deviation from a straight line path and also shaped by dynamic mesh collisions detected and resolved mathematically. In model ARTIC, the paths were further constrained by surfaces matching the control settings of the articulator. Despite these differences, the lower mid-incisor point paths were very similar in both models. The study suggests that mathematical simulation utilising interocclusal 'bite' registrations can closely replicate the primary movements of casts mounted in a semi-adjustable articulator. Additional indexing positions and appropriate software could, in some situations, replace the need for mechanical semi-adjustable articulation and/or its virtual representation. PMID:26685912

  11. Simulation of dental collisions and occlusal dynamics in the virtual environment.

    PubMed

    Stavness, I K; Hannam, A G; Tobias, D L; Zhang, X

    2016-04-01

    Semi-adjustable articulators have often been used to simulate occlusal dynamics, but advances in intra-oral scanning and computer software now enable dynamics to be modelled mathematically. Computer simulation of occlusal dynamics requires accurate virtual casts, records to register them and methods to handle mesh collisions during movement. Here, physical casts in a semi-adjustable articulator were scanned with a conventional clinical intra-oral scanner. A coordinate measuring machine was used to index their positions in intercuspation, protrusion, right and left laterotrusion, and to model features of the articulator. Penetrations between the indexed meshes were identified and resolved using restitution forces, and the final registrations were verified by distance measurements between dental landmarks at multiple sites. These sites were confirmed as closely approximating via measurements made from homologous transilluminated vinylpolysiloxane interocclusal impressions in the mounted casts. Movements between the indexed positions were simulated with two models in a custom biomechanical software platform. In model DENTAL, 6 degree-of-freedom movements were made to minimise deviation from a straight line path and also shaped by dynamic mesh collisions detected and resolved mathematically. In model ARTIC, the paths were further constrained by surfaces matching the control settings of the articulator. Despite these differences, the lower mid-incisor point paths were very similar in both models. The study suggests that mathematical simulation utilising interocclusal 'bite' registrations can closely replicate the primary movements of casts mounted in a semi-adjustable articulator. Additional indexing positions and appropriate software could, in some situations, replace the need for mechanical semi-adjustable articulation and/or its virtual representation.

  12. Education About Dental Hygienists' Roles in Public Dental Prevention Programs: Dental and Dental Hygiene Students' and Faculty Members' and Dental Hygienists' Perspectives.

    PubMed

    Pervez, Anushey; Kinney, Janet S; Gwozdek, Anne; Farrell, Christine M; Inglehart, Marita R

    2016-09-01

    In 2005, Public Act No. 161 (PA 161) was passed in Michigan, allowing dental hygienists to practice in approved public dental prevention programs to provide services for underserved populations while utilizing a collaborative agreement with a supervising dentist. The aims of this study were to assess how well dental and dental hygiene students and faculty members and practicing dental hygienists have been educated about PA 161, what attitudes and knowledge about the act they have, and how interested they are in additional education about it. University of Michigan dental and dental hygiene students and faculty members, students in other Michigan dental hygiene programs, and dental hygienists in the state were surveyed. Respondents (response rate) were 160 dental students (50%), 63 dental hygiene students (82%), 30 dental faculty members (26%), and 12 dental hygiene faculty members (52%) at the University of Michigan; 143 dental hygiene students in other programs (20%); and 95 members of the Michigan Dental Hygienists' Association (10%). The results showed that the dental students were less educated about PA 161 than the dental hygiene students, and the dental faculty members were less informed than the dental hygiene faculty members and dental hygienists. Responding dental hygiene faculty members and dental hygienists had more positive attitudes about PA 161 than did the students and dental faculty members. Most of the dental hygiene faculty members and dental hygienists knew a person providing services in a PA 161 program. Most dental hygiene students, faculty members, and dental hygienists wanted more education about PA 161. Overall, the better educated about the program the respondents were, the more positive their attitudes, and the more interested they were in learning more. PMID:27587574

  13. Instabilities of a spatial system of articulated pipes conveying fluid

    NASA Technical Reports Server (NTRS)

    Bohn, M. P.; Herrmann, G.

    1974-01-01

    A spatial system of two articulated pipes conveying fluid is examined analytically and experimentally. As the flow rate is increased, stable equilibrium may be lost by either divergence (static buckling) or by flutter (oscillations with increasing amplitude), depending upon the value of an angle beta which measures the 'out-of-planeness' of the system. It is found that in the range O less than beta less than 90 deg there exists a transition value below which stability is lost by flutter and above which stability is lost by divergence.

  14. Articulated primary mirror /APM/ for the Solar Optical Telescope /SOT/

    NASA Technical Reports Server (NTRS)

    Gowrinathan, S.; Gottesman, J.

    1981-01-01

    Allowing the location of the primary vs secondary mirrors to be movable in space, the articulated primary mirror (APM) was designed as an inexpensive alternative, providing stable imagery, for the Solar Optical Telescope (SOT). Requirements of high resolution in the sub-arc-second region, and the ability to point the telescope through the Instrument Pointing System (IPS) were satisfied. Alignment sensors, contained within the subsystem, locate the points of coincidence of the foci of the primary and secondary optics (conic foci). These are utilized as inputs for subsystem actuators to correct via the digital controller algorithm.

  15. Articulated limiter blade for a tokamak fusion reactor

    DOEpatents

    Doll, D.W.

    1982-10-21

    A limiter blade for a large tokomak fusion reactor includes three articulated blade sections for enabling the limiter blade to be adjusted for plasmas of different sizes. Each blade section is formed of a rigid backing plate carrying graphite tiles coated with titanium carbide, and the limiter blade forms a generally elliptic contour in both the poloidal and toroidal directions to uniformly distribute the heat flow to the blade. The limiter blade includes a central blade section movable along the major radius of the vacuum vessel, and upper and lower pivotal blade sections which may be pivoted by linear actuators having rollers held to the back surface of the pivotal blade sections.

  16. Articulated limiter blade for a tokamak fusion reactor

    DOEpatents

    Doll, David W.

    1985-01-01

    A limiter blade for a large tokomak fusion reactor includes three articulated blade sections for enabling the limiter blade to be adjusted for plasmas of different sizes. Each blade section is formed of a rigid backing plate carrying graphite tiles coated with titanium carbide, and the limiter blade forms a generally elliptic contour in both the poloidal and toroidal directions to uniformly distribute the heat flow to the blade. The limiter blade includes a central blade section movable along the major radius of the vacuum vessel, and upper and lower pivotal blade sections which may be pivoted by linear actuators having rollers held to the back surface of the pivotal blade sections.

  17. Evolution of Autonomous Self-Righting Behaviors for Articulated Nanorovers

    NASA Technical Reports Server (NTRS)

    Tunstel, Edward

    1999-01-01

    Miniature rovers with articulated mobility mechanisms are being developed for planetary surface exploration on Mars and small solar system bodies. These vehicles are designed to be capable of autonomous recovery from overturning during surface operations. This paper describes a computational means of developing motion behaviors that achieve the autonomous recovery function. It proposes a control software design approach aimed at reducing the effort involved in developing self-righting behaviors. The approach is based on the integration of evolutionary computing with a dynamics simulation environment for evolving and evaluating motion behaviors. The automated behavior design approach is outlined and its underlying genetic programming infrastructure is described.

  18. Articulated limiter blade for a tokomak fusion reactor

    SciTech Connect

    Doll, D. W.

    1985-07-30

    A limiter blade for a large tokomak fusion reactor includes three articulated blade sections for enabling the limiter blade to be adjusted for plasmas of different sizes. Each blade section is formed of a rigid backing plate carrying graphite tiles coated with titanium carbide, and the limiter blade forms a generally elliptic contour in both the poloidal and toroidal directions to uniformly distribute the heat flow to the blade. The limiter blade includes a central blade section movable along the major radius of the vacuum vessel, and upper and lower pivotal blade sections which may be pivoted by linear actuators having rollers held to the back surface of the pivotal blade sections.

  19. A blind algorithm for recovering articulator positions from acoustics

    SciTech Connect

    Hogden, John E

    2009-01-01

    MIMICRI is a signal-processing algorithm that has been shown to blindly infer and invert memoryless nonlinear functions of unobservable bandlimited signals, such as the mapping from the unobservable positions of the speech articulators to observable speech sounds. We review results of using MIMICRI on toy problems and on human speech data. We note that MIMICRI requires that the user specify two parameters: the dimensionality and pass-band of the unobservable signals. We show how to use cross-validation to help estimate the passband. An unexpected consequence of this work is that it helps separate signals with overlapping frequency bands.

  20. [Prosthetic treatment of mandibular pseudarthrosis using an articulated prosthesis].

    PubMed

    Sidibe, C A; Razouk, O; Dichamp, J; Bertrand, J C; Vaillant, J M

    1994-01-01

    Two cases with complete loss of the tooth-bearing portion of the mandible were repaired with a prosthesis. This type of defect can involve the loss of a large number of teeth and aggression to the remaining teeth must be limited as much as possible. A two-part "articulated" prosthesis with two rings appears to be the best adapted system. This method takes into account the requirements of for additional conventional prostheses and thus makes it possible to save the remaining teeth.

  1. Dental Assisting Program Guide.

    ERIC Educational Resources Information Center

    Georgia Univ., Athens. Dept. of Vocational Education.

    This program guide contains the standard dental assisting curriculum for technical institutes in Georgia. The curriculum encompasses the minimum competencies required for entry-level dental assistants, and includes job skills in the technical areas of preventive dentistry; four-handed dentistry; chairside assisting with emphasis in diagnostics,…

  2. Dental Charting. Student's Manual.

    ERIC Educational Resources Information Center

    Weaver, Trudy Karlene; Apfel, Maura

    This manual is part of a series dealing with skills and information needed by students in dental assisting. The individualized student materials are suitable for classroom, laboratory, or cooperative training programs. This student manual contains four units covering the following topics: dental anatomical terminology; tooth numbering systems;…

  3. Dental Laboratory Technician.

    ERIC Educational Resources Information Center

    Ohio State Univ., Columbus. Center on Education and Training for Employment.

    This document, which is designed for use in developing a tech prep competency profile for the occupation of dental laboratory technician, lists technical competencies and competency builders for 13 units pertinent to the health technologies cluster in general and 8 units to the occupation of dental laboratory technician. The following skill areas…

  4. The future dental workforce?

    PubMed

    Gallagher, J E; Wilson, N H F

    2009-02-28

    The Editor-in-Chief of the BDJ has previously raised important questions about dental workforce planning and the implications for dental graduates of recent changes and pressures. It is now time to revisit this issue. Much has changed since the last workforce review in England and Wales, and the rate of change is in all probability set to increase. First, at the time of writing this paper the momentous step of including dental care professionals (DCPs) on General Dental Council (GDC) registers in the United Kingdom has recently been completed. Second, the Scope of Practice of all dental professionals has been under consultation by the General Dental Council, and research evidence suggests that greater use should be made of skill-mix in the dental team. Third, within England, Lord Darzi has just published the 'Final Report of the NHS Next Stage Review', which emphasises 'quality care' and 'team-working' as key features of healthcare; this report was accompanied by an important document entitled 'A High Quality Workforce', in which plans for local workforce planning within the NHS are outlined, placing responsibilities at national, local and regional levels. Fourth, policy makers across the UK are wrestling with addressing oral health needs, promoting health and facilitating access to dental care, all of which have implications for the nature and shape of the dental workforce. Fifth, with the impact of globalisation and European policies we are net gainers of dentists as well as having more in training. Sixth, although there have been reviews and policy initiatives by regulatory, professional and other bodies in support of shaping the dental workforce, there has been little serious consideration of skill-mix and funding mechanisms to encourage team-working. Together, these events demand that we enter a fresh debate on the future dental workforce which should extend beyond professional and national boundaries and inform workforce planning. This debate is of great

  5. The future dental workforce?

    PubMed

    Gallagher, J E; Wilson, N H F

    2009-02-28

    The Editor-in-Chief of the BDJ has previously raised important questions about dental workforce planning and the implications for dental graduates of recent changes and pressures. It is now time to revisit this issue. Much has changed since the last workforce review in England and Wales, and the rate of change is in all probability set to increase. First, at the time of writing this paper the momentous step of including dental care professionals (DCPs) on General Dental Council (GDC) registers in the United Kingdom has recently been completed. Second, the Scope of Practice of all dental professionals has been under consultation by the General Dental Council, and research evidence suggests that greater use should be made of skill-mix in the dental team. Third, within England, Lord Darzi has just published the 'Final Report of the NHS Next Stage Review', which emphasises 'quality care' and 'team-working' as key features of healthcare; this report was accompanied by an important document entitled 'A High Quality Workforce', in which plans for local workforce planning within the NHS are outlined, placing responsibilities at national, local and regional levels. Fourth, policy makers across the UK are wrestling with addressing oral health needs, promoting health and facilitating access to dental care, all of which have implications for the nature and shape of the dental workforce. Fifth, with the impact of globalisation and European policies we are net gainers of dentists as well as having more in training. Sixth, although there have been reviews and policy initiatives by regulatory, professional and other bodies in support of shaping the dental workforce, there has been little serious consideration of skill-mix and funding mechanisms to encourage team-working. Together, these events demand that we enter a fresh debate on the future dental workforce which should extend beyond professional and national boundaries and inform workforce planning. This debate is of great

  6. Nonlinearity between acoustics and articulation in Hungarian transparent vowels

    NASA Astrophysics Data System (ADS)

    Benus, Stefan; Kirke, Karen D.; Gafos, Adamantios I.

    2001-05-01

    We present novel results from the acoustic and articulatory investigation of the production of the transparent vowels (TVs) /i/, /i:/, /e:/ in Hungarian (colon denotes length). The acoustic measurements of the front-back distinction (second formant, the difference of the first and second formants [Ladefoged, 1993]) show that the effect of adjacent back vowels on the front quality of the TVs is only weakly significant. The articulatory measurements of the same data, however, show that adjacent back vowels cause highly significant retraction of the tongue body during the production of the front TVs. The significance of this finding lies in its relevance to the relationship between phonetics and phonology. Our results demonstrate that minor phonetic differences in articulation, impossible to access by traditional theory, correlate with full-fledged phonological alternation of suffix selection in Hungarian. Traditional phonological accounts predict no effect of continuous phonetic details on discrete phonological generalizations. This is supported in our acoustic data but contrasts with our articulatory findings. In the paper we propose a dynamic model where phonological transparency is directly related to nonlinearity between acoustics and articulation [Stevens, 1989; Wood, 1979]. [Work supported by NIH.

  7. Hybrid markerless tracking of complex articulated motion in golf swings.

    PubMed

    Fung, Sim Kwoh; Sundaraj, Kenneth; Ahamed, Nizam Uddin; Kiang, Lam Chee; Nadarajah, Sivadev; Sahayadhas, Arun; Ali, Md Asraf; Islam, Md Anamul; Palaniappan, Rajkumar

    2014-04-01

    Sports video tracking is a research topic that has attained increasing attention due to its high commercial potential. A number of sports, including tennis, soccer, gymnastics, running, golf, badminton and cricket have been utilised to display the novel ideas in sports motion tracking. The main challenge associated with this research concerns the extraction of a highly complex articulated motion from a video scene. Our research focuses on the development of a markerless human motion tracking system that tracks the major body parts of an athlete straight from a sports broadcast video. We proposed a hybrid tracking method, which consists of a combination of three algorithms (pyramidal Lucas-Kanade optical flow (LK), normalised correlation-based template matching and background subtraction), to track the golfer's head, body, hands, shoulders, knees and feet during a full swing. We then match, track and map the results onto a 2D articulated human stick model to represent the pose of the golfer over time. Our work was tested using two video broadcasts of a golfer, and we obtained satisfactory results. The current outcomes of this research can play an important role in enhancing the performance of a golfer, provide vital information to sports medicine practitioners by providing technically sound guidance on movements and should assist to diminish the risk of golfing injuries.

  8. Variability in English vowels is comparable in articulation and acoustics

    PubMed Central

    Noiray, Aude; Iskarous, Khalil; Whalen, D. H.

    2014-01-01

    The nature of the links between speech production and perception has been the subject of longstanding debate. The present study investigated the articulatory parameter of tongue height and the acoustic F1-F0 difference for the phonological distinction of vowel height in American English front vowels. Multiple repetitions of /i, ɪ, e, ε, æ/ in [(h)Vd] sequences were recorded in seven adult speakers. Articulatory (ultrasound) and acoustic data were collected simultaneously to provide a direct comparison of variability in vowel production in both domains. Results showed idiosyncratic patterns of articulation for contrasting the three front vowel pairs /i-ɪ/, /e-ε/ and /ε-æ/ across subjects, with the degree of variability in vowel articulation comparable to that observed in the acoustics for all seven participants. However, contrary to what was expected, some speakers showed reversals for tongue height for /ɪ/-/e/ that was also reflected in acoustics with F1 higher for /ɪ/ than for /e/. The data suggest the phonological distinction of height is conveyed via speaker-specific articulatory-acoustic patterns that do not strictly match features descriptions. However, the acoustic signal is faithful to the articulatory configuration that generated it, carrying the crucial information for perceptual contrast. PMID:25101144

  9. The oldest articulated chondrichthyan from the Early Devonian period.

    PubMed

    Miller, Randall F; Cloutier, Richard; Turner, Susan

    2003-10-01

    Chondrichthyans (including living sharks, skates, rays and chimaeras) have a fossil record of scales and dermal denticles perhaps dating back to the Late Ordovician period, about 455 million years ago. Their fossil tooth record extends to the earliest Devonian period, almost 418 million years ago, whereas the oldest known articulated shark remains date from the Early Devonian period, about 394 million years ago. Here we report the discovery of an articulated shark that is almost 409 million years old from the Early Devonian (early Emsian) period of New Brunswick, Canada. The specimen, identified as Doliodus problematicus (Woodward), sheds light on the earliest chondrichthyans and their interrelationships with basal jawed vertebrates. This species has been truly problematic. Previously known only from isolated teeth, it has been identified as an acanthodian and a chondrichthyan. This specimen is the oldest shark showing the tooth families in situ, and preserves one of the oldest chondrichthyan braincases. More notably, it shows the presence of paired pectoral fin-spines, previously unknown in cartilaginous fishes. PMID:14523444

  10. Rethinking care through social reproduction: articulating circuits of migration.

    PubMed

    Kofman, Eleonore

    2012-01-01

    Care has come to dominate much feminist research on globalized migrations and the transfer of labor from the South to the North, while the older concept of reproduction had been pushed into the background but is now becoming the subject of debates on the commodification of care in the household and changes in welfare state policies. This article argues that we could achieve a better understanding of the different modalities and trajectories of care in the reproduction of individuals, families, and communities, both of migrant and nonmigrant populations by articulating the diverse circuits of migration, in particular that of labor and the family. In doing this, I go back to the earlier North American writing on racialized minorities and migrants and stratified social reproduction. I also explore insights from current Asian studies of gendered circuits of migration connecting labor and marriage migrations as well as the notion of global householding that highlights the gender politics of social reproduction operating within and beyond households in institutional and welfare architectures. In contrast to Asia, there has relatively been little exploration in European studies of the articulation of labor and family migrations through the lens of social reproduction. However, connecting the different types of migration enables us to achieve a more complex understanding of care trajectories and their contribution to social reproduction. PMID:22611577

  11. Interacting effects of syllable and phrase position on consonant articulation

    NASA Astrophysics Data System (ADS)

    Byrd, Dani; Lee, Sungbok; Riggs, Daylen; Adams, Jason

    2005-12-01

    The complexities of how prosodic structure, both at the phrasal and syllable levels, shapes speech production have begun to be illuminated through studies of articulatory behavior. The present study contributes to an understanding of prosodic signatures on articulation by examining the joint effects of phrasal and syllable position on the production of consonants. Articulatory kinematic data were collected for five subjects using electromagnetic articulography (EMA) to record target consonants (labial, labiodental, and tongue tip), located in (1) either syllable final or initial position and (2) either at a phrase edge or phrase medially. Spatial and temporal characteristics of the consonantal constriction formation and release were determined based on kinematic landmarks in the articulator velocity profiles. The results indicate that syllable and phrasal position consistently affect the movement duration; however, effects on displacement were more variable. For most subjects, the boundary-adjacent portions of the movement (constriction release for a preboundary coda and constriction formation for a postboundary onset) are not differentially affected in terms of phrasal lengthening-both lengthen comparably.

  12. Hybrid markerless tracking of complex articulated motion in golf swings.

    PubMed

    Fung, Sim Kwoh; Sundaraj, Kenneth; Ahamed, Nizam Uddin; Kiang, Lam Chee; Nadarajah, Sivadev; Sahayadhas, Arun; Ali, Md Asraf; Islam, Md Anamul; Palaniappan, Rajkumar

    2014-04-01

    Sports video tracking is a research topic that has attained increasing attention due to its high commercial potential. A number of sports, including tennis, soccer, gymnastics, running, golf, badminton and cricket have been utilised to display the novel ideas in sports motion tracking. The main challenge associated with this research concerns the extraction of a highly complex articulated motion from a video scene. Our research focuses on the development of a markerless human motion tracking system that tracks the major body parts of an athlete straight from a sports broadcast video. We proposed a hybrid tracking method, which consists of a combination of three algorithms (pyramidal Lucas-Kanade optical flow (LK), normalised correlation-based template matching and background subtraction), to track the golfer's head, body, hands, shoulders, knees and feet during a full swing. We then match, track and map the results onto a 2D articulated human stick model to represent the pose of the golfer over time. Our work was tested using two video broadcasts of a golfer, and we obtained satisfactory results. The current outcomes of this research can play an important role in enhancing the performance of a golfer, provide vital information to sports medicine practitioners by providing technically sound guidance on movements and should assist to diminish the risk of golfing injuries. PMID:24725790

  13. Articulated registration: elastic registration based on a wire-model

    NASA Astrophysics Data System (ADS)

    Martin-Fernandez, Miguel A.; Munyoz-Moreno, Emma; Martin-Fernandez, Marcos; Alberola-Lopez, Carlos

    2005-04-01

    In this paper we propose a new method of elastic registration of anatomical structures that bears an inner skeleton, such as the knee, hand or spine. Such a method has to deal with great degrees of variability, specially for the case of inter-subject registration; but even for the intra-subject case the degree of variability of images will be large since the structures we bear in mind are articulated. Rigid registration methods are clearly inappropriate for this problem, and well-known elastic methods do not usually incorporate the restriction of maintaining long skeletal structures straight. A new method is therefore needed to deal with such a situation; we call this new method "articulated registration". The inner bone skeleton is modeled with a wire model, where wires are drawn by connecting landmarks located in the main joints of the skeletal structure to be registered (long bones). The main feature of our registration method is that within the bone axis (specifically, where the wires are) an exact registration is guaranteed, while for the remaining image points an elastic registration is carried out based on a distance transform (with respect to the model wires); this causes the registration on long bones to be affine to all practical purposes, while the registration of soft tissue -- far from the bones -- is elastic. As a proof-of-concept of this method we describe the registration of hands on radiographs.

  14. Articulated navigation testbed (ANT): an example of adaptable intrinsic mobility

    NASA Astrophysics Data System (ADS)

    Brosinsky, Chris A.; Hanna, Doug M.; Penzes, Steven G.

    2000-07-01

    An important but oft overlooked aspect of any robotic system is the synergistic benefit of designing the chassis to have high intrinsic mobility which complements rather than limits, its system capabilities. This novel concept continues to be investigated by the Defence Research Establishment Suffield (DRES) with the Articulated Navigation Testbed (ANT) Unmanned Ground Vehicle (UGV). The ANT demonstrates high mobility through the combination of articulated steering and a hybrid locomotion scheme which utilizes individually powered wheels on the edge of rigid legs; legs which are capable of approximately 450 degrees of rotation. The configuration can be minimally configured as a 4x4 and modularly expanded to 6x6, 8x8, and so on. This enhanced mobility configuration permits pose control and novel maneuvers such as stepping, bridging, crawling, etc. Resultant mobility improvements, particularly in unstructured and off-road environments, will reduce the resolution with which the UGV sensor systems must perceive its surroundings and decreases the computational requirements of the UGV's perception systems1 for successful semi-autonomous or autonomous terrain negotiation. This paper reviews critical vehicle developments leading up to the ANT concept, describes the basis for its configuration and speculates on the impact of the intrinsic mobility concept for UGV effectiveness.

  15. Cementless Revision Total Hip Arthroplasty with Ceramic Articulation

    PubMed Central

    Yang, Jong-Hyuck; Yang, Seong-Jo; Kang, Joon-Soon

    2015-01-01

    Purpose The results of ceramic-on-ceramic (CoC) bearing surfaces in primary total hip arthroplasty (THA) were well known. However, it was not known in revision THA. The purpose of this study is to report the results of revision THA with ceramic articulation. Materials and Methods A total of 112 revision THAs were evaluated. The mean age at the time of surgery was 51.6 years (27.7 to 84.2 years). The mean duration of the follow-up periods was 6.3 years (2.3 to 11.4 years). Results The Harris hip scores improved from an average of 56.2 at the index surgery to an average of 93.3 at the last follow-up (P<0.001). None of hips showed osteolysis or ceramic head fracture. One hip showed aseptic loosening in the acetabular component with squeaking that caused a re-revision. There were nine cases of dislocation. The survivorship at 5 years was 94.5% (95% confidence interval, 87.9% to 97.6%) with revision for any reason as the endpoint and 100% with femoral revision. Conclusion The ceramic articulation is one of good bearing options for revision THA in patients with a long life expectancy. PMID:27536630

  16. The oldest articulated chondrichthyan from the Early Devonian period.

    PubMed

    Miller, Randall F; Cloutier, Richard; Turner, Susan

    2003-10-01

    Chondrichthyans (including living sharks, skates, rays and chimaeras) have a fossil record of scales and dermal denticles perhaps dating back to the Late Ordovician period, about 455 million years ago. Their fossil tooth record extends to the earliest Devonian period, almost 418 million years ago, whereas the oldest known articulated shark remains date from the Early Devonian period, about 394 million years ago. Here we report the discovery of an articulated shark that is almost 409 million years old from the Early Devonian (early Emsian) period of New Brunswick, Canada. The specimen, identified as Doliodus problematicus (Woodward), sheds light on the earliest chondrichthyans and their interrelationships with basal jawed vertebrates. This species has been truly problematic. Previously known only from isolated teeth, it has been identified as an acanthodian and a chondrichthyan. This specimen is the oldest shark showing the tooth families in situ, and preserves one of the oldest chondrichthyan braincases. More notably, it shows the presence of paired pectoral fin-spines, previously unknown in cartilaginous fishes.

  17. What is dental ecology?

    PubMed

    Cuozzo, Frank P; Sauther, Michelle L

    2012-06-01

    Teeth have long been used as indicators of primate ecology. Early work focused on the links between dental morphology, diet, and behavior, with more recent years emphasizing dental wear, microstructure, development, and biogeochemistry, to understand primate ecology. Our study of Lemur catta at the Beza Mahafaly Special Reserve, Madagascar, has revealed an unusual pattern of severe tooth wear and frequent tooth loss, primarily the result of consuming a fallback food for which these primates are not dentally adapted. Interpreting these data was only possible by combining our areas of expertise (dental anatomy [FC] and primate ecology [MS]). By integrating theoretical, methodological, and applied aspects of both areas of research, we adopted the term "dental ecology"-defined as the broad study of how teeth respond to the environment. Specifically, we view dental ecology as an interpretive framework using teeth as a vehicle for understanding an organism's ecology, which builds upon earlier work, but creates a new synthesis of anatomy and ecology that is only possible with detailed knowledge of living primates. This framework includes (1) identifying patterns of dental pathology and tooth use-wear, within the context of feeding ecology, behavior, habitat variation, and anthropogenic change, (2) assessing ways in which dental development and biogeochemical signals can reflect habitat, environmental change and/or stress, and (3) how dental microstructure and macro-morphology are adapted to, and reflect feeding ecology. Here we define dental ecology, provide a short summary of the development of this perspective, and place our new work into this context. PMID:22610892

  18. Individual tooth macrowear pattern guides the reconstruction of Sts 52 (Australopithecus africanus) dental arches.

    PubMed

    Benazzi, Stefano; Kullmer, Ottmar; Schulz, Dieter; Gruppioni, Giorgio; Weber, Gerhard W

    2013-02-01

    The functional restoration of the occlusal relationship between maxillary and mandibular tooth rows is a major challenge in modern dentistry and maxillofacial surgery. Similar technical challenges are present in paleoanthropology when considering fragmented and deformed mandibular and maxillary fossils. Sts 52, an Australopithecus africanus specimen from Sterkfontein Member 4, represents a typical case where the original shape of the dental arches is no longer preserved. It includes a partial lower face (Sts 52a) and a fragmented mandible (Sts 52b), both incomplete and damaged to such an extent to thwart attempts at matching upper and lower dentitions. We show how the preserved macro wear pattern of the tooth crowns can be used to functionally reconstruct Sts 52's dental arches. High-resolution dental stone casts of Sts 52 maxillary and mandibular dentition were mounted and repositioned in a dental articulator. The occlusal relationship between antagonists was restored based on the analysis of the occlusal wear pattern of each preserved tooth, considering all dental contact movements represented in the occlusal compass. The reconstructed dental arches were three-dimensional surface scanned and their occlusal kinematics tested in a simulation. The outcome of this contribution is the first functional restoration of A. africanus dental arches providing new morphometric data for specimen Sts 52. It is noteworthy that the method described in this case study might be applied to several other fossil specimens.

  19. Health Instruction Packages: Permanent Teeth, Dental Deposits, and Dental Instruments. Dientes Permanentes, Depositos Dentales y Instrumentos Dentales.

    ERIC Educational Resources Information Center

    Lind, Patricia; Germano, Catherine

    These five learning modules use text interspersed with illustrations and reinforcement exercises to instruct dental aide and dental hygiene students about jaw bones and gums, dental deposits, and dental instruments. The first four modules were prepared by Patricia Lind in both Spanish and English. "The Gum and Bone of Permanent Teeth" ("La Encia y…

  20. Dental journals: yesterday and today.

    PubMed

    Woodmansey, Karl

    2012-10-01

    Today's dentists may subscribe to, or receive complimentarily, a number of periodical publications containing technical professional information. Dental journals are the prime example: providing timely, reliable and useful information. The development of dental journals is a component of the evolution of scientific communication. This article reviews the origins and evolution of dental journals, including the Texas Dental Journal. PMID:23311024

  1. Dynamics and control of robotic aircraft with articulated wings

    NASA Astrophysics Data System (ADS)

    Paranjape, Aditya Avinash

    There is a considerable interest in developing robotic aircraft, inspired by birds, for a variety of missions covering reconnaissance and surveillance. Flapping wing aircraft concepts have been put forth in light of the efficiency of flapping flight at small scales. These aircraft are naturally equipped with the ability to rotate their wings about the root, a form of wing articulation. This thesis covers some problems concerning the performance, stability and control of robotic aircraft with articulated wings in gliding flight. Specifically, we are interested in aircraft without a vertical tail, which would then use wing articulation for longitudinal as well as lateral-directional control. Although the dynamics and control of articulated wing aircraft share several common features with conventional fixed wing aircraft, the presence of wing articulation presents several unique benefits as well as limitations from the perspective of performance and control. One of the objective of this thesis is to understand these features using a combination of theoretical and numerical tools. The aircraft concept envisioned in this thesis uses the wing dihedral angles for longitudinal and lateral-directional control. Aircraft with flexible articulated wings are also investigated. We derive a complete nonlinear model of the flight dynamics incorporating dynamic CG location and the changing moment of inertia. We show that symmetric dihedral configuration, along with a conventional horizontal tail, can be used to control flight speed and flight path angle independently of each other. This characteristic is very useful for initiating an efficient perching maneuver. It is shown that wing dihedral angles alone can effectively regulate sideslip during rapid turns and generate a wide range of equilibrium turn rates while maintaining a constant flight speed and regulating sideslip. We compute the turning performance limitations that arise due to the use of wing dihedral for yaw control

  2. Dental student debt.

    PubMed

    Mannion, H; Bedi, R

    1995-09-01

    The aim of this investigation is to provide information about the financial status of dental students enrolled on the Bachelor of Dental Surgery degree course at the University of Birmingham. All undergraduate dental students enrolled during the academic year 1993-94 were asked to participate in the study. The pre-tested questionnaire, which was given to all students, covered personal details, expenditure levels, income, loans, overdrafts, use of government schemes ('top-up loans'), and so on. The questionnaire was completed by 115 dental students (response rate 47%). The results showed that dental students' debts increased each year throughout the course. A top-up loan (range 700 Pounds-850 Pounds) had been taken out by 36% of students. The financial status of 9% of students was severe enough to warrant their eligibility for awards from access funds. Credit cards were possessed by 52% of the surveyed students, and although only half of these owed money, 22% owed between 500 Pounds and 2000 Pounds. Personal overdrafts were held by 56% of respondents. A total of 17% of students engaged in weekly part-time employment. The average debt for final year students was 1200 Pounds. Dental students' estimates of the level of debt they were likely to incur was greater than the actual debt presently experienced by final year students. In conclusion, this preliminary study showed that most dental students incur debt during their undergraduate course and that this debt increases during the course.

  3. High-Performance 3D Articulated Robot Display

    NASA Technical Reports Server (NTRS)

    Powell, Mark W.; Torres, Recaredo J.; Mittman, David S.; Kurien, James A.; Abramyan, Lucy

    2011-01-01

    In the domain of telerobotic operations, the primary challenge facing the operator is to understand the state of the robotic platform. One key aspect of understanding the state is to visualize the physical location and configuration of the platform. As there is a wide variety of mobile robots, the requirements for visualizing their configurations vary diversely across different platforms. There can also be diversity in the mechanical mobility, such as wheeled, tracked, or legged mobility over surfaces. Adaptable 3D articulated robot visualization software can accommodate a wide variety of robotic platforms and environments. The visualization has been used for surface, aerial, space, and water robotic vehicle visualization during field testing. It has been used to enable operations of wheeled and legged surface vehicles, and can be readily adapted to facilitate other mechanical mobility solutions. The 3D visualization can render an articulated 3D model of a robotic platform for any environment. Given the model, the software receives real-time telemetry from the avionics system onboard the vehicle and animates the robot visualization to reflect the telemetered physical state. This is used to track the position and attitude in real time to monitor the progress of the vehicle as it traverses its environment. It is also used to monitor the state of any or all articulated elements of the vehicle, such as arms, legs, or control surfaces. The visualization can also render other sorts of telemetered states visually, such as stress or strains that are measured by the avionics. Such data can be used to color or annotate the virtual vehicle to indicate nominal or off-nominal states during operation. The visualization is also able to render the simulated environment where the vehicle is operating. For surface and aerial vehicles, it can render the terrain under the vehicle as the avionics sends it location information (GPS, odometry, or star tracking), and locate the vehicle

  4. A maximum likelihood approach to estimating articulator positions from speech acoustics

    SciTech Connect

    Hogden, J.

    1996-09-23

    This proposal presents an algorithm called maximum likelihood continuity mapping (MALCOM) which recovers the positions of the tongue, jaw, lips, and other speech articulators from measurements of the sound-pressure waveform of speech. MALCOM differs from other techniques for recovering articulator positions from speech in three critical respects: it does not require training on measured or modeled articulator positions, it does not rely on any particular model of sound propagation through the vocal tract, and it recovers a mapping from acoustics to articulator positions that is linearly, not topographically, related to the actual mapping from acoustics to articulation. The approach categorizes short-time windows of speech into a finite number of sound types, and assumes the probability of using any articulator position to produce a given sound type can be described by a parameterized probability density function. MALCOM then uses maximum likelihood estimation techniques to: (1) find the most likely smooth articulator path given a speech sample and a set of distribution functions (one distribution function for each sound type), and (2) change the parameters of the distribution functions to better account for the data. Using this technique improves the accuracy of articulator position estimates compared to continuity mapping -- the only other technique that learns the relationship between acoustics and articulation solely from acoustics. The technique has potential application to computer speech recognition, speech synthesis and coding, teaching the hearing impaired to speak, improving foreign language instruction, and teaching dyslexics to read. 34 refs., 7 figs.

  5. Articulatory drift in the speech of children with articulation and phonological disorders.

    PubMed

    Gibbon, Fiona E; Wood, Sara E

    2002-08-01

    This study used electropalatography to identify articulatory drift in alveolar stops (/t/ and /d/) produced by 10 children with functional articulation and phonological disorders. Drift involves an abnormal change in place of articulation that occurs during stop closure. An index was used to measure drift, with higher values indicating greater drift. The results showed that drift was higher for children who produced undifferentiated gestures (articulations with increased tongue-palate contact). Drift is an important characteristic of articulation because it is believed to reflect impaired speech motor control. In addition, drift could explain some perceptually based speech errors that are frequently reported in functional disorders. PMID:12365267

  6. The History of Articulators: The Wonderful World of "Grinders," Part III.

    PubMed

    Starcke, Edgar N; Engelmeier, Robert L

    2016-02-01

    This is the third article in a three-part series on the history of denture occlusal grinders. The first article reviewed the earliest attempts to "grind in" denture occlusion by hand manipulating simple articulators with special features to those more complex devices powered by hand cranks. The second article explored devices that were motor driven, either those with cast holders to grind the occlusion of processed dentures or those designed to utilize an articulator's condylar or incisal controls for that purpose. This article examines those articulators that have a rotary occlusal grinder as an essential feature. Additionally, this article reviews those grinding devices produced as attachments for popular contemporary articulators.

  7. The oldest articulated osteichthyan reveals mosaic gnathostome characters.

    PubMed

    Zhu, Min; Zhao, Wenjin; Jia, Liantao; Lu, Jing; Qiao, Tuo; Qu, Qingming

    2009-03-26

    The evolutionary history of osteichthyans (bony fishes plus tetrapods) extends back to the Ludlow epoch of the Silurian period. However, these Silurian forms have been documented exclusively by fragmentary fossils. Here we report the discovery of an exceptionally preserved primitive fish from the Ludlow of Yunnan, China, that represents the oldest near-complete gnathostome (jawed vertebrate). The postcranial skeleton of this fish includes a primitive pectoral girdle and median fin spine as in non-osteichthyan gnathostomes, but a derived macromeric squamation as in crown osteichthyans, and substantiates the unexpected mix of postcranial features in basal sarcopterygians, previously restored from the disarticulated remains of Psarolepis. As the oldest articulated sarcopterygian, the new taxon offers insights into the origin and early divergence of osteichthyans, and indicates that the minimum date for the actinopterygian-sarcopterygian split was no later than 419 million years ago.

  8. Functional Segregation of Cortical Regions Underlying Speech Timing and Articulation.

    PubMed

    Long, Michael A; Katlowitz, Kalman A; Svirsky, Mario A; Clary, Rachel C; Byun, Tara McAllister; Majaj, Najib; Oya, Hiroyuki; Howard, Matthew A; Greenlee, Jeremy D W

    2016-03-16

    Spoken language is a central part of our everyday lives, but the precise roles that individual cortical regions play in the production of speech are often poorly understood. To address this issue, we focally lowered the temperature of distinct cortical regions in awake neurosurgical patients, and we relate this perturbation to changes in produced speech sequences. Using this method, we confirm that speech is highly lateralized, with the vast majority of behavioral effects seen on the left hemisphere. We then use this approach to demonstrate a clear functional dissociation between nearby cortical speech sites. Focal cooling of pars triangularis/pars opercularis (Broca's region) and the ventral portion of the precentral gyrus (speech motor cortex) resulted in the manipulation of speech timing and articulation, respectively. Our results support a class of models that have proposed distinct processing centers underlying motor sequencing and execution for speech. PMID:26924439

  9. The oldest articulated osteichthyan reveals mosaic gnathostome characters.

    PubMed

    Zhu, Min; Zhao, Wenjin; Jia, Liantao; Lu, Jing; Qiao, Tuo; Qu, Qingming

    2009-03-26

    The evolutionary history of osteichthyans (bony fishes plus tetrapods) extends back to the Ludlow epoch of the Silurian period. However, these Silurian forms have been documented exclusively by fragmentary fossils. Here we report the discovery of an exceptionally preserved primitive fish from the Ludlow of Yunnan, China, that represents the oldest near-complete gnathostome (jawed vertebrate). The postcranial skeleton of this fish includes a primitive pectoral girdle and median fin spine as in non-osteichthyan gnathostomes, but a derived macromeric squamation as in crown osteichthyans, and substantiates the unexpected mix of postcranial features in basal sarcopterygians, previously restored from the disarticulated remains of Psarolepis. As the oldest articulated sarcopterygian, the new taxon offers insights into the origin and early divergence of osteichthyans, and indicates that the minimum date for the actinopterygian-sarcopterygian split was no later than 419 million years ago. PMID:19325627

  10. Speech processing in children with functional articulation disorders.

    PubMed

    Gósy, Mária; Horváth, Viktória

    2015-03-01

    This study explored auditory speech processing and comprehension abilities in 5-8-year-old monolingual Hungarian children with functional articulation disorders (FADs) and their typically developing peers. Our main hypothesis was that children with FAD would show co-existing auditory speech processing disorders, with different levels of these skills depending on the nature of the receptive processes. The tasks included (i) sentence and non-word repetitions, (ii) non-word discrimination and (iii) sentence and story comprehension. Results suggest that the auditory speech processing of children with FAD is underdeveloped compared with that of typically developing children, and largely varies across task types. In addition, there are differences between children with FAD and controls in all age groups from 5 to 8 years. Our results have several clinical implications.

  11. Fully articulated four-point-bend loading fixture

    NASA Technical Reports Server (NTRS)

    Calomino, Anthony M. (Inventor)

    1991-01-01

    A fully articulated four-point bend loading fixture for Modulus of Rupture (MOR) and fracture toughness specimens utilizes an upper loading plate in combination with a lower loading plate. The lower plate has a pair of spring loaded ball bearings which seat in V-shaped grooves located in the upper plate. The ball bearings are carried in the arms of the lower plate. A load is applied to the specimen through steel rollers, one large roller and one smaller roller each located on both the upper and lower plates. The large rollers have needle roller bearings which enable a single loading roller to rotate relative to the plate to which it is attached.

  12. Articulations of Health and Poverty Among Women on WIC.

    PubMed

    Yehya, Nadine A; Dutta, Mohan J

    2015-01-01

    With the global financial meltdown, the crisis of poverty has deepened in communities across the United States. This essay reports results from a culture-centered project on fostering spaces for listening to the voices of the poor in CrossRoads County, Indiana. It highlights the intersections of health and poverty as they emerge from the narratives of mothers utilizing the Supplemental Nutrition Program for Women, Infants, and Children (WIC). Depression, humiliation, and inaccessibility to health care and healthy living outline the struggles of women as they negotiate their access to health. The articulations of agency are situated around competing cultural narratives that, on the one hand, draw on the threads of individual responsibility which resonate through mainstream discourses of poverty in the United States and, on the other hand, interrogate the structural erasure of the basic capacities of health. PMID:25412104

  13. Accurate positioning of long, flexible ARM's (Articulated Robotic Manipulator)

    NASA Technical Reports Server (NTRS)

    Malachowski, Michael J.

    1988-01-01

    An articulated robotic manipulator (ARM) system is being designed for space applications. Work being done on a concept utilizing an infinitely stiff laser beam for position reference is summarized. The laser beam is projected along the segments of the ARM, and the position is sensed by the beam rider modules (BRM) mounted on the distal ends of the segments. The BRM concept is the heart of the system. It utilizes a combination of lateral displacements and rotational and distance measurement sensors. These determine the relative position of the two ends of the segments with respect to each other in six degrees of freedom. The BRM measurement devices contain microprocessor controlled data acquisition and active positioning components. An indirect adaptive controller is used to accurately control the position of the ARM.

  14. Measurement uncertainty analysis on laser tracker combined with articulated CMM

    NASA Astrophysics Data System (ADS)

    Zhao, Hui-ning; Yu, Lian-dong; Du, Yun; Zhang, Hai-yan

    2013-10-01

    The combined measurement technology plays an increasingly important role in the digitalized assembly. This paper introduces a combined measurement system consists of a Laser tracker and a FACMM,with the applications in the inspection of the position of the inner parts in a large-scale device. When these measurement instruments are combined, the resulting coordinate data set contains uncertainties that are a function of the base data sets and complex interactions between the measurement sets. Combined with the characteristics of Laser Tracker and Flexible Articulated Coordinate Measuring Machine (FACMM),Monte-Claro simulation mothed is employed in the uncertainty evaluation of combined measurement systems. A case study is given to demonstrate the practical applications of this research.

  15. Speech articulator measurements using low power EM-wave sensors

    SciTech Connect

    Holzrichter, J.F.; Burnett, G.C.; Ng, L.C.; Lea, W.A.

    1998-01-01

    Very low power electromagnetic (EM) wave sensors are being used to measure speech articulator motions as speech is produced. Glottal tissue oscillations, jaw, tongue, soft palate, and other organs have been measured. Previously, microwave imaging (e.g., using radar sensors) appears not to have been considered for such monitoring. Glottal tissue movements detected by radar sensors correlate well with those obtained by established laboratory techniques, and have been used to estimate a voiced excitation function for speech processing applications. The noninvasive access, coupled with the small size, low power, and high resolution of these new sensors, permit promising research and development applications in speech production, communication disorders, speech recognition and related topics. {copyright} {ital 1998 Acoustical Society of America.}

  16. Health inequalities in England: advocacy, articulation and action.

    PubMed

    Adshead, Fiona; Thorpe, Allison

    2009-01-01

    There is a long history of people expressing concern about the health, lifestyle and well-being of our population--and of proposals for action to address the inequitable experiences between groups within this population. Over time, our understanding of both the problem and its causal connections has changed considerably. This is reflected within an increasingly explicit articulation of the issues and a progressively more sophisticated and determined cross-sectoral approach to tackling health inequalities. This paper reflects on the progress we have made in England in addressing this challenge, suggesting that we need to engage more proactively with our population and with our international partners, taking a systematic partnership approach to inform policy, practice and delivery on the ground.

  17. [Articulation between child and adolescent mental health services].

    PubMed

    Delfini, Patricia Santos de Souza; Reis, Alberto Olavo Advincula

    2012-02-01

    The objective of this paper was to describe and analyze the articulation between children and adolescent mental health care interventions undertaken by teams working under the Family Health Strategy (FHS) and Psychosocial Care Centers for Children and Adolescents (CAPSI). In order to achieve these objectives, semi-structured interviews were conducted with five CAPSI and 13 FHS managers from five different regions of the city of São Paulo, Brazil. The 18 interviews were transcribed and analyzed froma hermeneutic perspective. It was found that interactions between the FHS and CAPSI occur mainly through referral of cases, matrix support or partnerships in cases concerning CAPSI. Obstacles, such as a lack of human resources, productivity goals and lack of training in mental health of FHS professionals were mentioned. The referral system and passing responsibility for mental health cases to specialized services and the hegemonic biomedical model and the fragmentation of care are common place in these services.

  18. Articulated Arm Coordinate Measuring Machine Calibration by Laser Tracker Multilateration

    PubMed Central

    Majarena, Ana C.; Brau, Agustín; Velázquez, Jesús

    2014-01-01

    A new procedure for the calibration of an articulated arm coordinate measuring machine (AACMM) is presented in this paper. First, a self-calibration algorithm of four laser trackers (LTs) is developed. The spatial localization of a retroreflector target, placed in different positions within the workspace, is determined by means of a geometric multilateration system constructed from the four LTs. Next, a nonlinear optimization algorithm for the identification procedure of the AACMM is explained. An objective function based on Euclidean distances and standard deviations is developed. This function is obtained from the captured nominal data (given by the LTs used as a gauge instrument) and the data obtained by the AACMM and compares the measured and calculated coordinates of the target to obtain the identified model parameters that minimize this difference. Finally, results show that the procedure presented, using the measurements of the LTs as a gauge instrument, is very effective by improving the AACMM precision. PMID:24688418

  19. Articulations of Health and Poverty Among Women on WIC.

    PubMed

    Yehya, Nadine A; Dutta, Mohan J

    2015-01-01

    With the global financial meltdown, the crisis of poverty has deepened in communities across the United States. This essay reports results from a culture-centered project on fostering spaces for listening to the voices of the poor in CrossRoads County, Indiana. It highlights the intersections of health and poverty as they emerge from the narratives of mothers utilizing the Supplemental Nutrition Program for Women, Infants, and Children (WIC). Depression, humiliation, and inaccessibility to health care and healthy living outline the struggles of women as they negotiate their access to health. The articulations of agency are situated around competing cultural narratives that, on the one hand, draw on the threads of individual responsibility which resonate through mainstream discourses of poverty in the United States and, on the other hand, interrogate the structural erasure of the basic capacities of health.

  20. Economic impact of dental hygienists on solo dental practices.

    PubMed

    Lazar, Vickie F; Guay, Albert H; Beazoglou, Tryfon J

    2012-08-01

    The fact that a significant percentage of dentists employ dental hygienists raises an important question: Are dental practices that utilize a dental hygienist structurally and operationally different from practices that do not? This article explores differences among dental practices that operate with and without dental hygienists. Using data from the American Dental Association's 2003 Survey of Dental Practice, a random sample survey of U.S. dentists, descriptive statistics were used to compare selected characteristics of solo general practitioners with and without dental hygienists. Multivariate regression analysis was used to estimate the effect of dental hygienists on the gross billings and net incomes of solo general practitioners. Differences in practice characteristics--such as hours spent in the practice and hours spent treating patients, wait time for a recall visit, number of operatories, square feet of office space, net income, and gross billings--were found between solo general practitioners who had dental hygienists and those who did not. Solo general practitioners with dental hygienists had higher gross billings. Higher gross billings would be expected, as would higher expenses. However, net incomes of those with dental hygienists were also higher. In contrast, the mean waiting time for a recall visit was higher among dentists who employed dental hygienists. Depending on personal preferences, availability of qualified personnel, etc., dentists who do not employ dental hygienists but have been contemplating that path may want to further research the benefits and opportunities that may be realized.

  1. The complete mitochondrial genome of Articulate Brachiopod Terebratal ia transversa

    SciTech Connect

    Helfenbein, Kevin G.; Brown, Wesley M.; Boore, Jeffrey L.

    2001-07-01

    We have sequenced the complete mitochondrial DNA (mtDNA) of the articulate brachiopod Terebratalia transversa. The circular genome is 14,291 bp in size, relatively small compared to other published metazoan mtDNAs. The 37 genes commonly found in animal mtDNA are present; the size decrease is due to the truncation of several tRNA, rRNA, and protein genes, to some nucleotide overlaps, and to a paucity of non-coding nucleotides. Although the gene arrangement differs radically from those reported for other metazoans, some gene junctions are shared with two other articulate brachiopods, Laqueus rubellus and Terebratulina retusa. All genes in the T. transversa mtDNA, unlike those in most metazoan mtDNAs reported, are encoded by the same strand. The A+T content (59.1 percent) is low for a metazoan mtDNA, and there is a high propensity for homopolymer runs and a strong base-compositional strand bias. The coding strand is quite G+T-rich, a skew that is shared by the confamilial (laqueid) specie s L. rubellus, but opposite to that found in T. retusa, a cancellothyridid. These compositional skews are strongly reflected in the codon usage patterns and the amino acid compositions of the mitochondrial proteins, with markedly different usage observed between T. retusa and the two laqueids. This observation, plus the similarity of the laqueid non-coding regions to the reverse complement of the non-coding region of the cancellothyridid, suggest that an inversion that resulted in a reversal in the direction of first-strand replication has occurred in one of the two lineages. In addition to the presence of one non-coding region in T. transversa that is comparable to those in the other brachiopod mtDNAs, there are two others with the potential to form secondary structures; one or both of these may be involved in the process of transcript cleavage.

  2. Dental care - child

    MedlinePlus

    ... Zakher B, Mitchell JP, Pappas M. Preventing dental caries in children <5 years: systematic review updating USPSTF ... chap 7. Ng MW, Chase I. Early childhood caries: risk-based disease prevention and management. Dent Clin ...

  3. Dental mesenchymal stem cells.

    PubMed

    Sharpe, Paul T

    2016-07-01

    Mammalian teeth harbour mesenchymal stem cells (MSCs), which contribute to tooth growth and repair. These dental MSCs possess many in vitro features of bone marrow-derived MSCs, including clonogenicity, expression of certain markers, and following stimulation, differentiation into cells that have the characteristics of osteoblasts, chondrocytes and adipocytes. Teeth and their support tissues provide not only an easily accessible source of MSCs but also a tractable model system to study their function and properties in vivo In addition, the accessibility of teeth together with their clinical relevance provides a valuable opportunity to test stem cell-based treatments for dental disorders. This Review outlines some recent discoveries in dental MSC function and behaviour and discusses how these and other advances are paving the way for the development of new biologically based dental therapies. PMID:27381225

  4. Glossary of Dental Terms

    MedlinePlus

    ... geta poker friv Home InfoBites Find an AGD Dentist Your Family's Oral Health About the AGD Dental ... and shape of teeth performed by a general dentist | More Edentulous having lost most or all of ...

  5. Infant dental care (image)

    MedlinePlus

    Even though newborns and infants do not have teeth, care of the mouth and gums is important. ... sugar water. As the child grows, establishing proper dental hygiene will promote healthy teeth and gums which ...

  6. Dental Care in Pregnancy

    MedlinePlus

    ... for you and your baby and contain less sugar that can damage your teeth. Water or low-fat milk hydrates you and contains little or no sugar. For More Information American Dental Association: Pregnancy http : / / ...

  7. Dental arch asymmetry

    PubMed Central

    Al-Zubair, Nabil Muhsen

    2014-01-01

    Objective: This study was conducted to assess the dental arch asymmetry in a Yemeni sample aged (18-25) years. Materials and Methods: The investigation involved clinical examination of 1479 adults; only 253 (129 females, 124 males) out of the total sample were selected to fulfill the criteria for the study sample. Study models were constructed and evaluated to measure mandibular arch dimensions. Three linear distances were utilized on each side on the dental arch: Incisal-canine distance, canine-molar distance and incisal-molar distance, which represent the dental arch segmental measurements. Results: When applying “t-test” at P < 0.05, no significant differences were found between the right and left canine-molar, incisal-canine and incisal-molar distances in both dental arches for both sexes. The greater variation (0.30 mm) was observed between right and left canine-molar distance in the maxillary dental arch in male and the smaller (0.04 mm) in the mandibular dental arch between the right and left canine-molar distance in females. Conclusion: The findings of the present study revealed a symmetrical pattern of dental arches, since the right and left sides showed no statistically significant difference. In general, it can be observed that the measurements related to the central incisors and canines have the widest range of reading and give the impression that the location of central incisor and canines to each other and to other teeth is the strongest factor in determining the dental arch asymmetry. PMID:24966774

  8. Dental (Odontogenic) Pain

    PubMed Central

    Renton, Tara

    2011-01-01

    This article provides a simple overview of acute trigeminal pain for the non dentist. This article does not cover oral mucosal diseases (vesiculobullous disorders) that may cause acute pain. Dental pain is the most common in this group and it can present in several different ways. Of particular interest for is that dental pain can mimic both trigeminal neuralgia and other chronic trigeminal pain disorders. It is crucial to exclude these disorders whilst managing patients with chronic trigeminal pain. PMID:26527224

  9. Dental operatory water lines.

    PubMed

    Beierle, J W

    1993-02-01

    Water samples were collected from dental handpiece and air-water syringe lines at various times during the day and cultured for the presence and prevalence of various microbes. It was found that the longer a dental unit was out of use, the greater the microbial build-up in water lines. However, purging lines for two to three minutes at the start of the day and between patients significantly reduced microbial presence.

  10. Portable Dental System

    NASA Technical Reports Server (NTRS)

    1980-01-01

    Portable dental system provides dental care in isolated communities. System includes a patient's chair and a dentist's stool, an X-ray machine and a power unit, all of which fold into compact packages. A large yellow "pumpkin" is a collapsible compressed air tank. Portable system has been used successfully in South America in out of the way communities with this back-packable system, and in American nursing homes. This product is no longer manufactured.

  11. Method for analyzing articulated torques of heavy-duty six-legged robot

    NASA Astrophysics Data System (ADS)

    Zhuang, Hongchao; Gao, Haibo; Ding, Liang; Liu, Zhen; Deng, Zongquan

    2013-07-01

    The accuracy of an articulated torque analysis influences the comprehensive performances of heavy-duty multi-legged robots. Currently, the extremal estimation method and some complex methods are employed to calculate the articulated torques, which results in a large safety margin or a large number of calculations. To quickly obtain accurate articulated torques, an analysis method for the articulated torque is presented for an electrically driven heavy-duty six-legged robot. First, the rearmost leg that experiences the maximum normal contact force is confirmed when the robot transits a slope. Based on the ant-type and crab-type tripod gaits, the formulas of classical mechanics and MATLAB software are employed to theoretically analyze the relevant static torques of the joints. With the changes in the joint angles for the abductor joint, hip joint, and knee joint, variable tendency charts and extreme curves are obtained for the static articulated torques. Meanwhile, the maximum static articulated torques and the corresponding poses of the robot are also obtained. According to the poses of the robot under the maximum static articulated torques, ADAMS software is used to carry out a static simulation analysis. Based on the relevant simulation curves of the articulated torques, the maximum static articulated torques are acquired. A comparative analysis of the maximum static articulated torques shows that the theoretical calculation values are higher than the static simulation values, and the maximum error value is approximately 10%. The proposed method lays a foundation for quickly determining accurate articulated torques to develop heavy-duty six-legged robots.

  12. Saliva and dental erosion

    PubMed Central

    BUZALAF, Marília Afonso Rabelo; HANNAS, Angélicas Reis; KATO, Melissa Thiemi

    2012-01-01

    Dental erosion is a multifactorial condition. The consideration of chemical, biological and behavioral factors is fundamental for its prevention and therapy. Among the biological factors, saliva is one of the most important parameters in the protection against erosive wear. Objective This review discusses the role of salivary factors on the development of dental erosion. Material and Methods A search was undertaken on MEDLINE website for papers from 1969 to 2010. The keywords used in the research were "saliva", "acquired pellicle", "salivary flow", "salivary buffering capacity" and "dental erosion". Inclusion of studies, data extraction and quality assessment were undertaken independently and in duplicate by two members of the review team. Disagreements were solved by discussion and consensus or by a third party. Results Several characteristics and properties of saliva play an important role in dental erosion. Salivary clearance gradually eliminates the acids through swallowing and saliva presents buffering capacity causing neutralization and buffering of dietary acids. Salivary flow allows dilution of the acids. In addition, saliva is supersaturated with respect to tooth mineral, providing calcium, phosphate and fluoride necessary for remineralization after an erosive challenge. Furthermore, many proteins present in saliva and acquired pellicle play an important role in dental erosion. Conclusions Saliva is the most important biological factor affecting the progression of dental erosion. Knowledge of its components and properties involved in this protective role can drive the development of preventive measures targeting to enhance its known beneficial effects. PMID:23138733

  13. New Dental Accreditation Standard on Critical Thinking: A Call for Learning Models, Outcomes, Assessments.

    PubMed

    Johnsen, David C; Williams, John N; Baughman, Pauletta Gay; Roesch, Darren M; Feldman, Cecile A

    2015-10-01

    This opinion article applauds the recent introduction of a new dental accreditation standard addressing critical thinking and problem-solving, but expresses a need for additional means for dental schools to demonstrate they are meeting the new standard because articulated outcomes, learning models, and assessments of competence are still being developed. Validated, research-based learning models are needed to define reference points against which schools can design and assess the education they provide to their students. This article presents one possible learning model for this purpose and calls for national experts from within and outside dental education to develop models that will help schools define outcomes and assess performance in educating their students to become practitioners who are effective critical thinkers and problem-solvers.

  14. 42 CFR Appendix G to Part 75 - Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 42 Public Health 1 2010-10-01 2010-10-01 false Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography G Appendix G to Part 75 Public Health PUBLIC HEALTH SERVICE...—Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography The following...

  15. 42 CFR Appendix G to Part 75 - Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 42 Public Health 1 2011-10-01 2011-10-01 false Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography G Appendix G to Part 75 Public Health PUBLIC HEALTH SERVICE...—Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography The following...

  16. 42 CFR Appendix G to Part 75 - Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 42 Public Health 1 2013-10-01 2013-10-01 false Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography G Appendix G to Part 75 Public Health PUBLIC HEALTH SERVICE...—Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography The following...

  17. 42 CFR Appendix G to Part 75 - Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 42 Public Health 1 2014-10-01 2014-10-01 false Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography G Appendix G to Part 75 Public Health PUBLIC HEALTH SERVICE...—Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography The following...

  18. 42 CFR Appendix G to Part 75 - Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 42 Public Health 1 2012-10-01 2012-10-01 false Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography G Appendix G to Part 75 Public Health PUBLIC HEALTH SERVICE...—Standards for Licensing Dental Hygienists and Dental Assistants in Dental Radiography The following...

  19. Influence of dental materials on dental MRI

    PubMed Central

    Tymofiyeva, O; Vaegler, S; Rottner, K; Boldt, J; Hopfgartner, AJ; Proff, PC; Richter, E-J; Jakob, PM

    2013-01-01

    Objectives: To investigate the potential influence of standard dental materials on dental MRI (dMRI) by estimating the magnetic susceptibility with the help of the MRI-based geometric distortion method and to classify the materials from the standpoint of dMRI. Methods: A series of standard dental materials was studied on a 1.5 T MRI system using spin echo and gradient echo pulse sequences and their magnetic susceptibility was estimated using the geometric method. Measurements on samples of dental materials were supported by in vivo examples obtained in dedicated dMRI procedures. Results: The tested materials showed a range of distortion degrees. The following materials were classified as fully compatible materials that can be present even in the tooth of interest: the resin-based sealer AH Plus® (Dentsply, Maillefer, Germany), glass ionomer cement, gutta-percha, zirconium dioxide and composites from one of the tested manufacturers. Interestingly, composites provided by the other manufacturer caused relatively strong distortions and were therefore classified as compatible I, along with amalgam, gold alloy, gold–ceramic crowns, titanium alloy and NiTi orthodontic wires. Materials, the magnetic susceptibility of which differed from that of water by more than 200 ppm, were classified as non-compatible materials that should not be present in the patient’s mouth for any dMRI applications. They included stainless steel orthodontic appliances and CoCr. Conclusions: A classification of the materials that complies with the standard grouping of materials according to their magnetic susceptibility was proposed and adopted for the purposes of dMRI. The proposed classification can serve as a guideline in future dMRI research. PMID:23610088

  20. An Ultrasonographic Investigation of Cleft-Type Compensatory Articulations of Voiceless Velar Stops

    ERIC Educational Resources Information Center

    Bressmann, Tim; Radovanovic, Bojana; Kulkarni, Gajanan V.; Klaiman, Paula; Fisher, David

    2011-01-01

    Ultrasound imaging was used to investigate the articulation of the voiceless velar stop [k] in five speakers with compensatory articulation related to cleft palate. The perceptual evaluation of the acoustic realization and the visual assessment of the tongue movement for the target sound were made by three examiners. The analysis revealed a…

  1. Changes in Articulator Movement Variability during Phonemic Development: A Longitudinal Study

    ERIC Educational Resources Information Center

    Grigos, Maria I.

    2009-01-01

    Purpose: The present study explored articulator movement variability during voicing contrast acquisition. The purpose was to examine whether oral articulator movement trajectories associated with the production of voiced/voiceless bilabial phonemes in children became less variable over time. Method: Jaw, lower lip, and upper lip movements were…

  2. Direct Magnitude Estimation of Articulation Rate in Boys with Fragile X Syndrome

    ERIC Educational Resources Information Center

    Zajac, David J.; Harris, Adrianne A.; Roberts, Joanne E.; Martin, Gary E.

    2009-01-01

    Purpose: To compare the perceived articulation rate of boys with fragile X syndrome (FXS) with that of chronologically age-matched (CA) boys and to determine segmental and/or prosodic factors that account for perceived rate. Method: Ten listeners used direct magnitude estimation procedures to judge the articulation rates of 7 boys with FXS only, 5…

  3. 2 (Secondary) + 2 (Postsecondary) Articulated Curriculum for Health Occupations: A How-To-Manual.

    ERIC Educational Resources Information Center

    Lovelace, Bill E.; And Others

    This manual addresses specific aspects of the development and implementation of articulated vocational programs between high schools and colleges. The approach presented in the manual was derived from research and the experiences of the Paris Junior College (Texas) project staff who developed a "2 + 2" articulated career ladder curriculum for…

  4. Articulation Rate and Its Relationship to Disfluency Type, Duration, and Temperament in Preschool Children Who Stutter

    ERIC Educational Resources Information Center

    Tumanova, Victoria; Zebrowski, Patricia M.; Throneburg, Rebecca N.; Kayikci, Mavis E. Kulak

    2011-01-01

    The purpose of this study was to examine the relationship between articulation rate, frequency and duration of disfluencies of different types, and temperament in preschool children who stutter (CWS). In spontaneous speech samples from 19 CWS (mean age = 3:9; years:months), we measured articulation rate, the frequency and duration of (a) sound…

  5. Effects of Articulation Styles on Perception of Modulated Tempos in Violin Excerpts

    ERIC Educational Resources Information Center

    Geringer, John M.; Madsen, Clifford K.; Macleod, Rebecca B.

    2007-01-01

    We investigated effects of legato, staccato and pizzicato articulation styles on the perception of modulated tempos. Seventy-two music majors served as participants. Two solo violin excerpts were chosen with contrasting rhythmic rates and were recorded in all three articulation styles. Examples were presented to listeners in three conditions of…

  6. The Articulation of Korean Coronal Obstruents: Data from Heritage Speakers and Second Language Learners

    ERIC Educational Resources Information Center

    Ko, Insung

    2013-01-01

    This study investigated where the consonantal constrictions take place when Korean coronal obstruents are articulated since there is disagreement over the place of articulation of these consonants. Unlike other studies in Korean phonetics, which focus on various acoustic features, the current study used static palatography (SPG) in the form of…

  7. Vowel and Consonant Lessening: A Study of Articulating Reductions and Their Relations to Genders

    ERIC Educational Resources Information Center

    Lin, Grace Hui Chin; Chien, Paul Shih Chieh

    2011-01-01

    Using English as a global communicating tool makes Taiwanese people have to speak in English in diverse international situations. However, consonants and vowels in English are not all effortless for them to articulate. This phonological reduction study explores concepts about phonological (articulating system) approximation. From Taiwanese folks'…

  8. Articulation and Noncomprehension Signaling in Adolescent and Adult Males with Down Syndrome and Fragile X Syndrome

    ERIC Educational Resources Information Center

    Fedak, Larissa Ann

    2012-01-01

    The purpose of this study was to determine whether or not decreased articulation of speech played a role in the ability of an individual with Down syndrome or Fragile X syndrome to signal noncomprehension and whether the two groups differed in their levels of articulation of speech and noncomprehension signaling ability. The research was conducted…

  9. Articulation and Transfer: How Successful Is It in Missouri and Maryland?

    ERIC Educational Resources Information Center

    Goff, Donald Gary

    This report examines the articulation and transfer policies of Maryland and Missouri and reviews the extent to which these guidelines provide for a seamless transition between community colleges and state universities. The author begins by defining the key concepts relevant to this study (e.g., transfer, articulation, native student, transfer…

  10. The Development and Implementation of an Articulation Model Between the Intermediate School and Feeder Elementary Schools.

    ERIC Educational Resources Information Center

    Kilpatrick, John W.

    This practicum developed a model of vertical articulation between elementary feeder schools and an intermediate school. The program and model were developed after a formal needs assessment was carried out to determine articulation problems. After problems were determined, objectives were formulated and strategies developed. Objectives that…

  11. SCECAMP: Systemwide Career Education Cluster-Based Articulated Model Program (K-College Level). Final Report.

    ERIC Educational Resources Information Center

    New York City Board of Education, Brooklyn, NY. Center for Career and Occupational Education.

    The Systemwide Career Education Cluster-Based Articulated Model Program (SCECAMP) was designed to build and expand upon the successful career education projects and innovative programs pre-existing in the New York City school system. The project encouraged participating schools to articulate fully toward the end of providing students with…

  12. History of dental hygiene research.

    PubMed

    Bowen, Denise M

    2013-01-01

    Dental hygiene is defined as the science and practice of the recognition, treatment and prevention of oral diseases. The history of dental hygiene research is considered in the context of the development of the discipline and an emerging infrastructure. Research-related events supporting the growth and maturation of the profession are considered from the early years to the most recent. The benefits of preventive oral health services provided by dental hygienists have been supported by research, and the practice of dental hygiene has expanded as a result of research findings since its inception 100 years ago. Dental hygienists' engagement in research, however, did not begin until the 1960s as research associates or administrators, primarily with dental researchers as primary investigators. The Journal of Dental Hygiene (JDH) has provided information for dental hygiene practice since 1927, and has been the primary venue for dissemination of dental hygiene research since 1945. Graduate education in dental hygiene at the master's degree level and the work of early dental hygiene researchers led to the first conference on dental hygiene research in 1982. Over 30 years later, dental hygiene has established a meta-paradigm and defined conceptual models, built an initial infrastructure to support research endeavors and contributed much to the development of dental hygiene as a unique discipline. A doctoral degree in the discipline, continued theory-based research, initiatives to foster collaborations between dental hygiene and other researchers and enhanced capabilities to attract funding to support large scale studies are goals that must be attained through the efforts of future researchers to address the needs for additional development in the discipline of dental hygiene. Dental hygiene research supports the growing discipline and its value to society. PMID:24046337

  13. History of dental hygiene research.

    PubMed

    Bowen, Denise M

    2013-01-01

    Dental hygiene is defined as the science and practice of the recognition, treatment and prevention of oral diseases. The history of dental hygiene research is considered in the context of the development of the discipline and an emerging infrastructure. Research-related events supporting the growth and maturation of the profession are considered from the early years to the most recent. The benefits of preventive oral health services provided by dental hygienists have been supported by research, and the practice of dental hygiene has expanded as a result of research findings since its inception 100 years ago. Dental hygienists' engagement in research, however, did not begin until the 1960s as research associates or administrators, primarily with dental researchers as primary investigators. The Journal of Dental Hygiene (JDH) has provided information for dental hygiene practice since 1927, and has been the primary venue for dissemination of dental hygiene research since 1945. Graduate education in dental hygiene at the master's degree level and the work of early dental hygiene researchers led to the first conference on dental hygiene research in 1982. Over 30 years later, dental hygiene has established a meta-paradigm and defined conceptual models, built an initial infrastructure to support research endeavors and contributed much to the development of dental hygiene as a unique discipline. A doctoral degree in the discipline, continued theory-based research, initiatives to foster collaborations between dental hygiene and other researchers and enhanced capabilities to attract funding to support large scale studies are goals that must be attained through the efforts of future researchers to address the needs for additional development in the discipline of dental hygiene. Dental hygiene research supports the growing discipline and its value to society.

  14. Comparative study of condylar inclination settings in two types of semiadjustable articulators.

    PubMed

    Zabarović, Domagoj; Vojvodić, Denis; Katanec, Davor; Jerolimov, Vjekoslav; Carek, Vlado; Vusić, Josip

    2009-06-01

    The purpose of this study was to research the possible influence of difference in construction of mechanical joint in arcon and nonarcon articulators, upon the adjustment of condylar inclination by intraoral protrusive record. The determination of condylar inclination by protrusive record in two types of articulators was performed on 30 examinees, and the adjustment of condylar inclination in each articulator was done for left and right joint. In arcon articulator the measured values for condylar inclination were higher and the mean difference for right joint was 7.4 degrees, and for the left joint 7.2 degrees The found differences are statistically significant for both, left and right joint, at the level of P < 0.001. There is possible influence of difference in construction of mechanical joint upon the adjustment of condylar inclination by intraoral protrusive record. The arcon articulator, due to constant relation between occlusal plane and mechanical fossa, reproduces the movements more accurately.

  15. Evaluation of an improved orthognathic articulator system. 2. Accuracy of occlusal wafers.

    PubMed

    Paul, P E; Barbenel, J C; Walker, F S; Khambay, B S; Moos, K F; Ayoub, A F

    2012-02-01

    The errors produced by occlusal wafers constructed on casts of the teeth mounted on a standard articulator and an improved orthognathic articulator were investigated by carrying out simulated orthognathic surgery on plastic skulls. The wafers were used to relocate the position of the maxillae of the skulls. The vertical and horizontal displacements of the maxillae were determined from measurements of the positions of markers on the skull and teeth. Comparison of the magnitudes of the actual and intended movements showed that wafers constructed on the standard articulator had systematic prediction errors of up to 5mm, but the improved orthognathic articulator showed much smaller random errors. There was a statistically significant improvement in overall accuracy in predicting maxillary Le Fort I position with the use of the improved orthognathic articulator which the authors recommend for clinical use.

  16. Bulimia and Anorexia Nervosa in Dental and Dental Hygiene Curricula.

    ERIC Educational Resources Information Center

    Gross, Karen B. W.; And Others

    1990-01-01

    Dentists and dental hygienists are in a unique position to identify an eating disorder patient from observed oral manifestations and to refer the patient for psychological therapy. The inclusion of information on general and oral complications of bulimia and anorexia nervosa in dental and dental hygiene curriculum was examined. (MLW)

  17. Dental practice network of U.S. dental schools.

    PubMed

    Fisher, Monica A; Beeson, Dennis C; Hans, Mark G

    2009-12-01

    As dental schools incorporate training in evidence-based dentistry (EBD) into their curricula, students must learn how to critically evaluate systematic reviews and meta-analyses. It is important that dental education in the United States support the American Dental Association's position statement on EBD, which defines "best evidence" as data obtained from all study designs. Given that much evidence is missing when EBD is derived from Cochrane Systematic Reviews' randomized clinical trials, we propose the creation of a dental practice network of U.S. dental schools. We developed an electronic clinical dentistry research database for EBD using Epi-Info (available at www.cdc.gov/epiinfo/downloads.htm). As a free, public use software, Epi-Info provides the foundation for the development of clinical research databases that can increase the research capacity through multisite studies designed to generate outcomes data on the effectiveness of dental treatment. The creation of a dental practice network of dental schools with their large number of patients would expand the research capacity for EBD practice and advance the EBD science regarding the effectiveness of dental treatment. The next step is to link clinical dental researchers/educators at multiple dental schools through a collaborative clinical research network, so that the findings can be applied to the EBD component of problem-based learning curricula of dental education.

  18. Dental Implantology in U.S. Dental Schools.

    ERIC Educational Resources Information Center

    Bavitz, J. Bruce

    1990-01-01

    The results of a survey of 44 dental schools corroborate the belief that dental implantology is gaining widespread acceptance in U.S. dental schools. Currently, predoctoral students have limited clinical participation. Most programs have taken the position that clinical techniques are best taught within the existing specialties at a graduate…

  19. Curriculum Guidelines foe Dental Nutrition.

    ERIC Educational Resources Information Center

    Journal of Dental Education, 1989

    1989-01-01

    The American Association of Dental Schools' curriculum guidelines for dental nutrition include an overview of the curriculum, primary educational objectives, suggested prerequisites, a core content outline, and suggestions for sequencing and faculty qualifications. (MSE)

  20. Dental Health and Orthodontic Problems

    MedlinePlus

    ... Text Size Email Print Share Dental Health and Orthodontic Problems Page Content Article Body Dental Health Twin ... color can be tinted to match the teeth. Orthodontic Problems Crooked teeth, overbites and underbites are best ...

  1. Vocal-tract filtering by lingual articulation in a parrot.

    PubMed

    Beckers, Gabriël J L; Nelson, Brian S; Suthers, Roderick A

    2004-09-01

    Human speech and bird vocalization are complex communicative behaviors with notable similarities in development and underlying mechanisms. However, there is an important difference between humans and birds in the way vocal complexity is generally produced. Human speech originates from independent modulatory actions of a sound source, e.g., the vibrating vocal folds, and an acoustic filter, formed by the resonances of the vocal tract (formants). Modulation in bird vocalization, in contrast, is thought to originate predominantly from the sound source, whereas the role of the resonance filter is only subsidiary in emphasizing the complex time-frequency patterns of the source (e.g., but see ). However, it has been suggested that, analogous to human speech production, tongue movements observed in parrot vocalizations modulate formant characteristics independently from the vocal source. As yet, direct evidence of such a causal relationship is lacking. In five Monk parakeets, Myiopsitta monachus, we replaced the vocal source, the syrinx, with a small speaker that generated a broad-band sound, and we measured the effects of tongue placement on the sound emitted from the beak. The results show that tongue movements cause significant frequency changes in two formants and cause amplitude changes in all four formants present between 0.5 and 10 kHz. We suggest that lingual articulation may thus in part explain the well-known ability of parrots to mimic human speech, and, even more intriguingly, may also underlie a speech-like formant system in natural parrot vocalizations.

  2. Component modes damping assignment methodology for articulated, multiflexible body structures

    NASA Technical Reports Server (NTRS)

    Lee, Allan Y.

    1993-01-01

    To simulate the dynamical motion of articulated, multiflexible body structures, one can use multibody simulation packages such as DISCOS. To this end, one must supply appropriate reduced-order models for all of the flexible components involved. The component modes projection and assembly model reduction (COMPARE) methodology is one way to construct these reduced-order component models, which when reassembled capture important system input-to-output mapping of the full-order model at multiple system configurations of interest. In conjunction, we must also supply component damping matrices which when reassembled generate a system damping matrix that has certain desirable properties. The problem of determining the damping factors of components' modes to achieve a given system damping matrix is addressed here. To this end, we must establish from first principles a matrix-algebraic relation between the system's modal damping matrix and the components' modal damping matrices. An unconstrained/constrained optimization problem can then be formulated to determine the component modes' damping factors that best satisfy that matrix-algebraic relation. The effectiveness of the developed methodology, called ModeDamp, has been successfully demonstrated on a high-order, finite element model of the Galileo spacecraft.

  3. Missile guidance law design using adaptive cerebellar model articulation controller.

    PubMed

    Lin, Chih-Min; Peng, Ya-Fu

    2005-05-01

    An adaptive cerebellar model articulation controller (CMAC) is proposed for command to line-of-sight (CLOS) missile guidance law design. In this design, the three-dimensional (3-D) CLOS guidance problem is formulated as a tracking problem of a time-varying nonlinear system. The adaptive CMAC control system is comprised of a CMAC and a compensation controller. The CMAC control is used to imitate a feedback linearization control law and the compensation controller is utilized to compensate the difference between the feedback linearization control law and the CMAC control. The online adaptive law is derived based on the Lyapunov stability theorem to learn the weights of receptive-field basis functions in CMAC control. In addition, in order to relax the requirement of approximation error bound, an estimation law is derived to estimate the error bound. Then the adaptive CMAC control system is designed to achieve satisfactory tracking performance. Simulation results for different engagement scenarios illustrate the validity of the proposed adaptive CMAC-based guidance law.

  4. The Iowa Articulation Norms Project and its Nebraska replication.

    PubMed

    Smit, A B; Hand, L; Freilinger, J J; Bernthal, J E; Bird, A

    1990-11-01

    The purpose of the Iowa Articulation Norms Project and its Nebraska replication was to provide normative information about speech sound acquisition in these two states. An assessment instrument consisting of photographs and a checklist form for narrow phonetic transcription was administered by school-based speech-language pathologists to stratified samples of children in the age range 3-9 years. The resulting data were not influenced by the demographic variables of population density (rural/urban), SES (based on parental education), or state of residence (Iowa/Nebraska); however, sex of the child exerted a significant influence in some of the preschool age groups. The criteria used to determine acceptability of a production appeared to influence outcomes for some speech sounds. Acquisition curves were plotted for individual phoneme targets or groups of targets. These curves were used to develop recommended ages of acquisition for the tested speech sounds, with recommendations based generally on a 90% level of acquisition. Special considerations were required for the phonemes /ng s z/.

  5. Haptic perception with an articulated, sensate robot hand

    SciTech Connect

    Stansfield, S.A.

    1990-03-01

    In this paper we present a series of haptic exploratory procedures, or EPs, implemented for a multi-fingered, articulated, sensate robot hand. These EPs are designed to extract specific tactile and kinesthetic information form an object via their purposive invocation by an intelligent robotic system. Taken together, they form and active robotic touch perception system to be used both in extracting information about the environment for internal representation and in acquiring grasps for manipulation. The haptic system presented utilizes and integrated robotic system consisting of PUMA 560 robot arm, a JPL/Stanford robot hand, with joint torque sensing in the fingers, a wrist force/torque sensor, and 256 element, spatially-resolved fingertip tactile array. We describe the EPs implemented for this system and provide experimental results which illustrate how they function and how the information which they extract may be used. In addition to the sensate hand and arm, the robot also contains structured-lighting vision and a Prolog-based reasoning system capable of grasp generation and object categorization. We present a set of simple tasks which show how both grasping and recognition may be enhanced by the addition of active touch perception. 34 refs., 23 figs.

  6. Concepts first, jargon second improves student articulation of understanding.

    PubMed

    McDonnell, Lisa; Barker, Megan K; Wieman, Carl

    2016-01-01

    In this experiment, students in a large undergraduate biology course were first exposed to the concepts without new technical vocabulary ("jargon") in a pre-class reading assignment. Their learning of the concepts and jargon was compared with that of an equivalent group of students in another section of the same course, whose pre-class reading presented both the jargon and concepts together in the traditional manner. Both groups had the same active-learning classes with the same instructor, and then completed the same post-test. Although the two groups performed the same on the multiple choice questions of the post-test, the group exposed to concepts first and jargon second included 1.5 times and 2.5 times more correct arguments on two free-response questions about the concepts. The correct use of jargon between the two groups was similar, with the exception of one jargon term that the control group used more often. These results suggest that modest instructional changes whereby new concepts are introduced in a concepts-first, jargon-second manner can increase student learning, as demonstrated by their ability to articulate their understanding of new concepts. PMID:26537537

  7. Decoding of Covert Vowel Articulation Using Electroencephalography Cortical Currents

    PubMed Central

    Yoshimura, Natsue; Nishimoto, Atsushi; Belkacem, Abdelkader Nasreddine; Shin, Duk; Kambara, Hiroyuki; Hanakawa, Takashi; Koike, Yasuharu

    2016-01-01

    With the goal of providing assistive technology for the communication impaired, we proposed electroencephalography (EEG) cortical currents as a new approach for EEG-based brain-computer interface spellers. EEG cortical currents were estimated with a variational Bayesian method that uses functional magnetic resonance imaging (fMRI) data as a hierarchical prior. EEG and fMRI data were recorded from ten healthy participants during covert articulation of Japanese vowels /a/ and /i/, as well as during a no-imagery control task. Applying a sparse logistic regression (SLR) method to classify the three tasks, mean classification accuracy using EEG cortical currents was significantly higher than that using EEG sensor signals and was also comparable to accuracies in previous studies using electrocorticography. SLR weight analysis revealed vertices of EEG cortical currents that were highly contributive to classification for each participant, and the vertices showed discriminative time series signals according to the three tasks. Furthermore, functional connectivity analysis focusing on the highly contributive vertices revealed positive and negative correlations among areas related to speech processing. As the same findings were not observed using EEG sensor signals, our results demonstrate the potential utility of EEG cortical currents not only for engineering purposes such as brain-computer interfaces but also for neuroscientific purposes such as the identification of neural signaling related to language processing. PMID:27199638

  8. Maintaining proper dental records.

    PubMed

    Leeuw, Wilhemina

    2014-01-01

    Referred to as Standard of Care, the legal duty of a dentist requires exercising the degree of skill and care that would be exhibited by other prudent dentists faced with the same patient-care situation. Primarily, the goal of keeping good dental records is to maintain continuity of care. Diligent and complete documentation and charting procedures are essential to fulfilling the Standard of Care. Secondly, because dental records are considered legal documents they help protect the interest of the dentist and/or the patient by establishing the details of the services rendered. Patients today are better educated and more assertive than ever before and dentists must be equipped to protect themselves against malpractice claims. Every record component must be handled as if it could be summoned to a court room and scrutinized by an attorney, judge or jury. Complete, accurate, objective and honest entries in a patient record are the only way to defend against any clinical and/or legal problems that might arise. Most medical and dental malpractice claims arise from an unfavorable interaction with the dentist and not from a poor treatment outcome. By implementing the suggestions mentioned in this course, dental health care professionals can minimize the legal risks associated with the delivery of dental care to promote greater understanding for patients of their rights and privileges to their complete record. PMID:24834675

  9. Dental ethics and emotional intelligence.

    PubMed

    Rosenblum, Alvin B; Wolf, Steve

    2014-01-01

    Dental ethics is often taught, viewed, and conducted as an intell enterprise, uninformed by other noncognitive factors. Emotional intelligence (EQ) is defined distinguished from the cognitive intelligence measured by Intelligence Quotient (IQ). This essay recommends more inclusion of emotional, noncognitive input to the ethical decision process in dental education and dental practice.

  10. Dental Assistant Specialist. (AFSC 98150).

    ERIC Educational Resources Information Center

    Eling, David R.

    This four-volume student text is designed for use by Air Force personnel enrolled in a self-study extension course for dental assistant specialists. Covered in the individual volumes are an introduction to dental services (the mission and organization of medical/dental service, career ladder progressions, medical readiness/wartime training, and…

  11. Dental operatory design and equipment.

    PubMed

    Floyd, M

    1993-08-01

    Improving and expanding the dental services of a practice can involve purchasing new equipment and even modifying or expanding the physical plant. Operatory design is important to the efficiency with which dental procedures can be performed. Equipment purchases to outfit the dental operatory should be made based on the specific needs and functions of a practice.

  12. Dental obturation materials

    NASA Astrophysics Data System (ADS)

    Stockton, Elizabeth; Chudej, Lauren; Bilyeu, Brian; Brostow, Witold

    2006-10-01

    During the last decades, people have tried to develop a better material for use in dental obturation materials. This new material should meet the following requirements: durability, wear resistance, biocompatibility and chemical adhesion to dentin enamel. Wear resistance is very important and it is related with the service life of dental replacements. We have obtained aesthetically promising novel nano composites that can be used as dental replacements. The main objective of this work is to study the scratch and wear resistance of these nano composites. To meet this goal, scratch tests are performed using a micro scratch tester machine (CSEM), where a diamond indenter is used to make the scratch and the penetration of this indenter is measured with high resolution (7nm). We will be looking at the penetration depth (Rp) and the residual (or healing) depth (Rh) to calculate the percent recovery. These measurements represent the scratch resistance of the material.

  13. Dental amalgam: An update

    PubMed Central

    Bharti, Ramesh; Wadhwani, Kulvinder Kaur; Tikku, Aseem Prakash; Chandra, Anil

    2010-01-01

    Dental amalgam has served as an excellent and versatile restorative material for many years, despite periods of controversy. The authors review its history, summarize the evidence with regard to its performance and offer predictions for the future of this material. The PubMed database was used initially; the reference list for dental amalgam featured 8641 articles and 13 publications dealing with recent advances in dental amalgam. A forward search was undertaken on selected articles and using some author names. For the present, amalgam should remain the material of choice for economic direct restoration of posterior teeth. When esthetic concerns are paramount, tooth-colored materials, placed meticulously, can provide an acceptable alternative. All alternative restorative materials and procedures, however, have certain limitations. PMID:21217947

  14. Dental pulp stem cells

    PubMed Central

    Ashri, Nahid Y.; Ajlan, Sumaiah A.; Aldahmash, Abdullah M.

    2015-01-01

    Inflammatory periodontal disease is a major cause of loss of tooth-supporting structures. Novel approaches for regeneration of periodontal apparatus is an area of intensive research. Periodontal tissue engineering implies the use of appropriate regenerative cells, delivered through a suitable scaffold, and guided through signaling molecules. Dental pulp stem cells have been used in an increasing number of studies in dental tissue engineering. Those cells show mesenchymal (stromal) stem cell-like properties including self-renewal and multilineage differentiation potentials, aside from their relative accessibility and pleasant handling properties. The purpose of this article is to review the biological principles of periodontal tissue engineering, along with the challenges facing the development of a consistent and clinically relevant tissue regeneration platform. This article includes an updated review on dental pulp stem cells and their applications in periodontal regeneration, in combination with different scaffolds and growth factors. PMID:26620980

  15. Dental Implant Complications.

    PubMed

    Liaw, Kevin; Delfini, Ronald H; Abrahams, James J

    2015-10-01

    Dental implants have increased in the last few decades thus increasing the number of complications. Since many of these complications are easily diagnosed on postsurgical images, it is important for radiologists to be familiar with them and to be able to recognize and diagnose them. Radiologists should also have a basic understanding of their treatment. In a pictorial fashion, this article will present the basic complications of dental implants which we have divided into three general categories: biomechanical overload, infection or inflammation, and other causes. Examples of implant fracture, loosening, infection, inflammation from subgingival cement, failure of bone and soft tissue preservation, injury to surround structures, and other complications will be discussed as well as their common imaging appearances and treatment. Lastly, we will review pertinent dental anatomy and important structures that are vital for radiologists to evaluate in postoperative oral cavity imaging.

  16. Accurate recovery of articulator positions from acoustics: New conclusions based on human data

    SciTech Connect

    Hogden, J.; Lofqvist, A.; Gracco, V.; Zlokarnik, I.; Rubin, P.; Saltzman, E.

    1996-09-01

    Vocal tract models are often used to study the problem of mapping from the acoustic transfer function to the vocal tract area function (inverse mapping). Unfortunately, results based on vocal tract models are strongly affected by the assumptions underlying the models. In this study, the mapping from acoustics (digitized speech samples) to articulation (measurements of the positions of receiver coils placed on the tongue, jaw, and lips) is examined using human data from a single speaker: Simultaneous acoustic and articulator measurements made for vowel-to-vowel transitions, /g/ closures, and transitions into and out of /g/ closures. Articulator positions were measured using an EMMA system to track coils placed on the lips, jaw, and tongue. Using these data, look-up tables were created that allow articulator positions to be estimated from acoustic signals. On a data set not used for making look-up tables, correlations between estimated and actual coil positions of around 94{percent} and root-mean-squared errors around 2 mm are common for coils on the tongue. An error source evaluation shows that estimating articulator positions from quantized acoustics gives root-mean-squared errors that are typically less than 1 mm greater than the errors that would be obtained from quantizing the articulator positions themselves. This study agrees with and extends previous studies of human data by showing that for the data studied, speech acoustics can be used to accurately recover articulator positions. {copyright} {ital 1996 Acoustical Society of America.}

  17. Cross-language differences of articulation rate and its transfer into Japanese as a second language.

    PubMed

    Amino, Kanae; Osanai, Takashi

    2015-04-01

    Recently, the articulation rate has been attracting attention in forensic speech investigation as an acoustic feature that varies across speakers, dialects, and languages. The present study investigates how cross-language differences in the articulation rate are transferred into Japanese as a second language. Participants were speakers of Japanese, Chinese, Korean, and Thai. They were recorded while they read a passage in their native language and in Japanese. Local and global articulation rates were calculated based on the number of syllables as well as the number of morae for Japanese speech. When we compared the articulation rate of the native languages, Japanese was the fastest, then Korean, Chinese, and Thai in that order. Also, a significant positive correlation was observed between the articulation rate of the native language and that of the second language. A gender difference was found in the articulation rate of some languages, with males speaking faster than females. The effect of age was limited to Thai speakers only. Accent discrimination and identification experiments were conducted and the results revealed that native and non-native accents could be correctly discriminated just by the articulation rate.

  18. The perceived clarity of children's speech varies as a function of their default articulation rate

    PubMed Central

    Redford, Melissa A.

    2014-01-01

    The current study investigated whether variation in children's default articulation rate might reflect individual differences in the development of articulatory timing control, which predicts a positive correlation between rate and perceived clarity (motor skills hypothesis), or whether such variation is better attributed to speech external factors, which predicts that faster rates result in poorer target attainment (undershoot hypothesis). Two different speech samples were obtained from 54 typically developing children (5;2 – 7;11). Six utterances were extracted from each sample and measured for articulation rate and segmental duration. Fourteen adult listeners rated the utterances for clarity (enunciation). Acoustic correlates of perceived clarity, pitch, and vowel quality were also measured. The findings were that age-dependent and individual differences in children's default articulation rates were due to segmental articulation and not to suprasegmental changes. The rating data indicated that utterances produced at faster rates were perceived as more clearly articulated than those produced at slower rates, regardless of a child's age. Vowel quality measures predicted perceived clarity independently of articulation rate. Overall, the results support the motor skills hypothesis: Faster default articulation rates emerge from better articulatory timing control. PMID:24815275

  19. Dental Support Organizations.

    PubMed

    Dufurrena, Quinn

    2015-01-01

    The Association of Dental Support Organizations is a recently formed association of 33 companies representing a range of management and support services for dental practices. These organizations do not engage in the practice of dentistry, although in some cases they operate as holding companies for practices that do, thus separating the legal responsibility of providing treatment from the management and flow of funds. This report summarizes some of the recent trends in oral health care and dentists' practice patterns that are prompting the increased prevalence of this model. The general functioning of the DSO model is described, including some common variations, and the core values of ADSO are featured. PMID:26455048

  20. Performance of Dental Ceramics

    PubMed Central

    Rekow, E.D.; Silva, N.R.F.A.; Coelho, P.G.; Zhang, Y.; Guess, P.; Thompson, V.P.

    2011-01-01

    The clinical success of modern dental ceramics depends on an array of factors, ranging from initial physical properties of the material itself, to the fabrication and clinical procedures that inevitably damage these brittle materials, and the oral environment. Understanding the influence of these factors on clinical performance has engaged the dental, ceramics, and engineering communities alike. The objective of this review is to first summarize clinical, experimental, and analytic results reported in the recent literature. Additionally, it seeks to address how this new information adds insight into predictive test procedures and reveals challenges for future improvements. PMID:21224408

  1. [Hardening of dental instruments].

    PubMed

    Gerasev, G P

    1981-01-01

    The possibility of prolonging the service life of stomatological instruments by the local hardening of their working parts is discussed. Such hardening should be achieved by using hard and wear-resistant materials. The examples of hardening dental elevators and hard-alloy dental drills are given. New trends in the local hardening of instruments are the treatment of their working parts with laser beams, the application of coating on their surface by the gas-detonation method. The results of research work and trials are presented.

  2. Dental education: a leadership challenge for dental educators and practitioners.

    PubMed

    Roth, Kathleen

    2007-08-01

    By all outward signs, the dental profession is prospering. However, signs of a looming crisis in dental education threaten the future effectiveness of the profession. Transforming dental education through the application of principles espoused by the ADEA Commission on Change and Innovation in Dental Education (CCI) is essential for securing the future of the profession. To meet the future oral health needs of the public, dental schools must retain their research mission and prepare students for evidence-based practice. To accomplish this, both the curricular content and the environment and approach to dental education must change. Besides the knowledge and abilities needed to care for a more diverse and aging population, future practitioners must possess tools needed to thrive in the world of small business and have the ethical foundation to conduct themselves as responsible professionals. Ensuring the future of the profession is a leadership challenge to be shared by both dental educators and practitioners.

  3. 75 FR 16511 - Pentron Clinical Technologies, a Wholly-Owned Subsidiary of Kerr Dental/Sybron Dental...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-01

    ... such as dental prosthetics, dental composites, dental impressions, dental adhesives, and other dental... prosthetics, dental composites, dental impressions, dental adhesives, and other dental materials to Mexicali... the Federal Register on February 16, 2010 (75 FR 7037). At the request of the State Agency,...

  4. Very fast motion planning for highly dexterous-articulated robots

    NASA Technical Reports Server (NTRS)

    Challou, Daniel J.; Gini, Maria; Kumar, Vipin

    1994-01-01

    Due to the inherent danger of space exploration, the need for greater use of teleoperated and autonomous robotic systems in space-based applications has long been apparent. Autonomous and semi-autonomous robotic devices have been proposed for carrying out routine functions associated with scientific experiments aboard the shuttle and space station. Finally, research into the use of such devices for planetary exploration continues. To accomplish their assigned tasks, all such autonomous and semi-autonomous devices will require the ability to move themselves through space without hitting themselves or the objects which surround them. In space it is important to execute the necessary motions correctly when they are first attempted because repositioning is expensive in terms of both time and resources (e.g., fuel). Finally, such devices will have to function in a variety of different environments. Given these constraints, a means for fast motion planning to insure the correct movement of robotic devices would be ideal. Unfortunately, motion planning algorithms are rarely used in practice because of their computational complexity. Fast methods have been developed for detecting imminent collisions, but the more general problem of motion planning remains computationally intractable. However, in this paper we show how the use of multicomputers and appropriate parallel algorithms can substantially reduce the time required to synthesize paths for dexterous articulated robots with a large number of joints. We have developed a parallel formulation of the Randomized Path Planner proposed by Barraquand and Latombe. We have shown that our parallel formulation is capable of formulating plans in a few seconds or less on various parallel architectures including: the nCUBE2 multicomputer with up to 1024 processors (nCUBE2 is a registered trademark of the nCUBE corporation), and a network of workstations.

  5. The effects of Le Fort I osteotomy with maxillary movement on articulation, resonance, and velopharyngeal function.

    PubMed

    Kummer, A W; Strife, J L; Grau, W H; Creaghead, N A; Lee, L

    1989-07-01

    Articulation, resonance, and velopharyngeal function were evaluated before and after Le Fort I maxillary advancement in 16 patients (seven with cleft lip and palate, one with cleft lip only, and eight without clefts). On the postoperative evaluation, seven of 11 patients with preoperative articulation errors showed an improvement in articulation after surgery. Two patients without clefts showed slight changes in nasal resonance, and two patients (one with cleft lip and palate and one with cleft lip only) developed mild nasal emission. Nine patients showed diminished velopharyngeal contact during speech on videofluoroscopic studies. Compensatory changes in velopharyngeal function were also observed, which included velar stretching and lengthening and increased lateral pharyngeal wall movement.

  6. Deep water drilling and production Articulated Column - Water depth 350m

    SciTech Connect

    Baduel, F.; Figenschou, A.

    1985-01-01

    An Articulated Tower for drilling and production in the Norwegian Sea for 350m water depth is presented. Main features are: Christmas trees at the deck-level, 17,000 tonnes deck payload, limited motions, steel structure including main float and lattice, low stressed mechanical articulation with anti-torque device and controlled bending risers. The extensive study has considered in detail the behaviour in extreme conditions, the fatigue of main structural parts and risers, operating procedures, fabrication and installation. General results are given concerning behaviour, structural design, articulation, bending riser, fabrication and installation. A fabrication and installation schedule is also given.

  7. Drugs that promote dental caries.

    PubMed

    2015-02-01

    Dental caries result from erosion of tooth enamel or cementum by acidic substances produced by bacteria found in dental plaque. Caries can lead to pulp necrosis and tooth loss. Risk factors include certain dietary habits, poor oral hygiene, and dry mouth. Diabetes and Sjogren's syndrome can also promote dental caries. Psychotropic substances such as cocaine, methamphetamine, heroin and cannabis can promote dental caries. Many medicinal drugs facilitate the formation of dental caries, through various mechanisms; they include formulations with a high sugar content; drugs that cause dry mouth (especially antimuscarinics); drugs that lower the buccal pH (inhaled powders, etc.); and drugs that cause demineralisation (tetracyclines, etc.). In practice, patients (and parents) should be informed that some drugs can increase the risk of dental caries. They should be encouraged to adapt and reinforce dental hygiene, and advised to visit a dentist regularly. PMID:25802916

  8. Drugs that promote dental caries.

    PubMed

    2015-02-01

    Dental caries result from erosion of tooth enamel or cementum by acidic substances produced by bacteria found in dental plaque. Caries can lead to pulp necrosis and tooth loss. Risk factors include certain dietary habits, poor oral hygiene, and dry mouth. Diabetes and Sjogren's syndrome can also promote dental caries. Psychotropic substances such as cocaine, methamphetamine, heroin and cannabis can promote dental caries. Many medicinal drugs facilitate the formation of dental caries, through various mechanisms; they include formulations with a high sugar content; drugs that cause dry mouth (especially antimuscarinics); drugs that lower the buccal pH (inhaled powders, etc.); and drugs that cause demineralisation (tetracyclines, etc.). In practice, patients (and parents) should be informed that some drugs can increase the risk of dental caries. They should be encouraged to adapt and reinforce dental hygiene, and advised to visit a dentist regularly.

  9. Review of Spaceflight Dental Emergencies

    NASA Technical Reports Server (NTRS)

    Menon, Anil

    2012-01-01

    All exploration class missions--extending beyond earth's orbit--differ from existing orbital missions by being of longer duration and often not having a means of evacuation. If an exploration mission extends beyond a year, then there will be a greater lapse since the crewmembers last terrestrial dental exams, which routinely occur each year. This increased time since professional dental care could increase the chance of a dental emergency such as intractable pain, dental decay requiring a temporary filling, crown replacement, exposed pulp, abscess, tooth avulsion, or toothache. Additionally, any dental emergency will have to be treated in-flight with available resources and personnel who may not have extensive training in dental care. Thus, dental emergencies are an important risk to assess in preparation for exploration missions.

  10. Dental amalgam and mercury

    SciTech Connect

    Mackert, J.R. Jr. )

    1991-08-01

    This paper looks at the issues of the current amalgam controversy: the daily dose of mercury from amalgam, hypersensitivity to mercury, claims of adverse effects from amalgam mercury and alleged overnight 'cures.' In addition, the toxicity and allergenicity of the proposed alternative materials are examined with the same kind of scrutiny applied by the anti-amalgam group to dental amalgam. 100 references.

  11. FATIGUE OF DENTAL CERAMICS

    PubMed Central

    Zhang, Yu; Sailer, Irena; Lawn, Brian R

    2013-01-01

    Objectives Clinical data on survival rates reveal that all-ceramic dental prostheses are susceptible to fracture from repetitive occlusal loading. The objective of this review is to examine the underlying mechanisms of fatigue in current and future dental ceramics. Data/sources The nature of various fatigue modes is elucidated using fracture test data on ceramic layer specimens from the dental and biomechanics literature. Conclusions Failure modes can change over a lifetime, depending on restoration geometry, loading conditions and material properties. Modes that operate in single-cycle loading may be dominated by alternative modes in multi-cycle loading. While post-mortem examination of failed prostheses can determine the sources of certain fractures, the evolution of these fractures en route to failure remains poorly understood. Whereas it is commonly held that loss of load-bearing capacity of dental ceramics in repetitive loading is attributable to chemically-assisted 'slow crack growth' in the presence of water, we demonstrate the existence of more deleterious fatigue mechanisms, mechanical rather than chemical in nature. Neglecting to account for mechanical fatigue can lead to gross overestimates in predicted survival rates. Clinical significance Strategies for prolonging the clinical lifetimes of ceramic restorations are proposed based on a crack-containment philosophy. PMID:24135295

  12. Dental Issues & Down Syndrome

    MedlinePlus

    ... dental school, has extra training in caring for patients with disabilities. The Special Care Dentistry Association is a resource to find a dentist ... for children who grind their teeth, because the risk of the child choking on the mouthguard if it breaks ... Academy of Pediatric Dentistry www.aapd.org Find a dentist at www. ...

  13. Dental Health in TSC

    MedlinePlus

    ... to occur in nearly 100% of the TSC population. Not all dental pits are cavities; they are just areas where enamel did not form, but can be an area where food can build up and start a cavity. Gums The gums may have small areas of growth called gingival fibromas , which are mostly harmless and ...

  14. Skylab Dental Examination

    NASA Technical Reports Server (NTRS)

    1973-01-01

    Skylab 2 Commander Charles Conrad is seen undergoing a dental examination by the Medical Officer, Joseph Kerwin in the Skylab Medical Facility. In the absence of an examination chair, Conrad simply rotated his body to an upside down position to facilitate the procedure.

  15. Dental Optical Coherence Tomography

    PubMed Central

    Hsieh, Yao-Sheng; Ho, Yi-Ching; Lee, Shyh-Yuan; Chuang, Ching-Cheng; Tsai, Jui-che; Lin, Kun-Feng; Sun, Chia-Wei

    2013-01-01

    This review paper describes the applications of dental optical coherence tomography (OCT) in oral tissue images, caries, periodontal disease and oral cancer. The background of OCT, including basic theory, system setup, light sources, spatial resolution and system limitations, is provided. The comparisons between OCT and other clinical oral diagnostic methods are also discussed. PMID:23857261

  16. Ethics of dental health screening.

    PubMed

    Janakiram, Chandrashekar; Taha, Farheen

    2016-01-01

    Screening is the detection of disease at a point in its natural history when it is not yet symptomatic. In the natural history of dental caries, for example, the incipient lesions are at a reversible stage, which is a pre-symptomatic or an unrecognised symptomatic disease. Ideally, this is the stage during which screening should identify the risk of dental caries; however, presently, the so-called dental screening employed identifies the clinical cavitation of the tooth, which is very obvious to the individual. The individual already knows that he/she has dental caries and needs treatment, which the screening personnel (dental doctor) explains again during the screening procedure. Is it ethical to call such an event screening? The mushrooming of dental teaching hospitals has promoted regular screening of dental diseases among the communities and schoolchildren through their community dentistry-related activities. More often, it is a dental "check-up" that is carried out on the pretext of screening for dental diseases. Though the basic intention of this activity is to promote awareness of dental diseases and promote good health, there is also a hidden agenda to it. An artificial demand for dental care is created that is easily capitalised on by the dental teaching institutions to enhance its clinical activity. Dental screening is doing more harm than good as patients are made aware of the diseases for which they may not be able to afford treatment. This narrative review gives an account of the scientific evidence on screening for oral diseases, the current practices in screening and the ethical dilemmas of dental screening programmes. PMID:27474698

  17. Cells in monkey STS responsive to articulated body motions and consequent static posture: a case of implied motion?

    PubMed

    Jellema, Tjeerd; Perrett, David I

    2003-01-01

    We show that populations of visually responsive cells in the anterior part of the superior temporal sulcus (STSa) of the macaque monkey code for the sight of both specific articulated body actions and the consequent articulated static body postures. We define articulated actions as actions where one body part (e.g. a limb or head) moves with respect to the remainder of the body which remains static; conversely non-articulated actions are actions where the equivalent body parts do not move with respect to each other but move as one. Similarly, articulated static body postures contain a torsion or rotation between parts, while non-articulated postures do not. Cells were tested with the sight of articulated and non-articulated actions followed by the resultant articulated or non-articulated static body postures. In addition, the static body postures that formed the start and end of the actions were tested in isolation. The cells studied did not respond to the sight of non-articulated static posture, which formed the starting-point of the action, but responded vigorously to the articulated static posture that formed the end-point of the action. Other static postures resembling the articulated end-point posture, but which were in a more relaxed muscular state (i.e. non-articulated), did not evoke responses. The cells did not respond to body actions that were less often associated with the effective static articulated postures. Our results suggest that the cells' responses were related to the implied action rather than the static posture per se. We propose that the neural representations in STSa for actual biological motion may also extend to biological motion implied from static postures. These representations could play a role in producing the activity in the medial temporal/medial superior temporal (V5(MT)/MST) areas reported in fMRI studies when subjects view still photographs of people in action. PMID:14527537

  18. Development of an inexpensive optical method for studies of dental erosion process in vitro

    NASA Astrophysics Data System (ADS)

    Nasution, A. M. T.; Noerjanto, B.; Triwanto, L.

    2008-09-01

    Teeth have important roles in digestion of food, supporting the facial-structure, as well as in articulation of speech. Abnormality in teeth structure can be initiated by an erosion process due to diet or beverages consumption that lead to destruction which affect their functionality. Research to study the erosion processes that lead to teeth's abnormality is important in order to be used as a care and prevention purpose. Accurate measurement methods would be necessary as a research tool, in order to be capable for quantifying dental destruction's degree. In this work an inexpensive optical method as tool to study dental erosion process is developed. It is based on extraction the parameters from the 3D dental visual information. The 3D visual image is obtained from reconstruction of multiple lateral projection of 2D images that captured from many angles. Using a simple motor stepper and a pocket digital camera, sequence of multi-projection 2D images of premolar tooth is obtained. This images are then reconstructed to produce a 3D image, which is useful for quantifying related dental erosion parameters. The quantification process is obtained from the shrinkage of dental volume as well as surface properties due to erosion process. Results of quantification is correlated to the ones of dissolved calcium atom which released from the tooth using atomic absorption spectrometry. This proposed method would be useful as visualization tool in many engineering, dentistry, and medical research. It would be useful also for the educational purposes.

  19. Perceptual, durational and tongue displacement measures following articulation therapy for rhotic sound errors.

    PubMed

    Bressmann, Tim; Harper, Susan; Zhylich, Irina; Kulkarni, Gajanan V

    2016-01-01

    Outcomes of articulation therapy for rhotic errors are usually assessed perceptually. However, our understanding of associated changes of tongue movement is limited. This study described perceptual, durational and tongue displacement changes over 10 sessions of articulation therapy for /ɹ/ in six children. Four of the participants also received ultrasound biofeedback of their tongue shape. Speech and tongue movement were recorded pre-therapy, after 5 sessions, in the final session and at a one month follow-up. Perceptually, listeners perceived improvement and classified more productions as /ɹ/ in the final and follow-up assessments. The durations of VɹV syllables at the midway point of the therapy were longer. Cumulative tongue displacement increased in the final session. The average standard deviation was significantly higher in the middle and final assessments. The duration and tongue displacement measures illustrated how articulation therapy affected tongue movement and may be useful for outcomes research about articulation therapy. PMID:26979162

  20. The modification of multiple articulation errors based on distinctive feature theory.

    PubMed

    Costello, J; Onstine, J M

    1976-05-01

    The effectiveness of articulation remediation procedures based on distinctive feature theory was evaluated through the administration of an articulation program designed for this purpose. Two preschool children with multiple phoneme errors which could be described by a distinctive feature analysis were the subjects. Both children substituted stop phonemes for most continuant phonemes. Each child was individually administered the distinctive feature program which is described in full. Data are presented which indicate the adequacy of the treatment program, the acquisition of correct articulation of the two directly treated target phonemes, and the concurrent improvement of five other nontreated error phonemes. Such across-phoneme generalization was predicted by distinctive feature theory. Certain modifications in the treatment program are suggested and theoretical/empirical questions regarding articulation remediation from a distinctive features viewpoint are discussed.

  1. Performance of Children with Good and Poor Articulation on Tasks of Tongue Placement.

    ERIC Educational Resources Information Center

    Jordan, Linda Smith; And Others

    1978-01-01

    The study determined whether first grade children (nine with good and nine with poor articulation skills) could learn to replicate four positions of lingual-palatal contact with and without topical anesthesia that eliminated touch-pressure sensations. (Author)

  2. Direct and indirect measures of speech articulator motions using low power EM sensors

    SciTech Connect

    Barnes, T; Burnett, G; Gable, T; Holzrichter, J F; Ng, L

    1999-05-12

    Low power Electromagnetic (EM) Wave sensors can measure general properties of human speech articulator motions, as speech is produced. See Holzrichter, Burnett, Ng, and Lea, J.Acoust.Soc.Am. 103 (1) 622 (1998). Experiments have demonstrated extremely accurate pitch measurements (< 1 Hz per pitch cycle) and accurate onset of voiced speech. Recent measurements of pressure-induced tracheal motions enable very good spectra and amplitude estimates of a voiced excitation function. The use of the measured excitation functions and pitch synchronous processing enable the determination of each pitch cycle of an accurate transfer function and, indirectly, of the corresponding articulator motions. In addition, direct measurements have been made of EM wave reflections from articulator interfaces, including jaw, tongue, and palate, simultaneously with acoustic and glottal open/close signals. While several types of EM sensors are suitable for speech articulator measurements, the homodyne sensor has been found to provide good spatial and temporal resolution for several applications.

  3. Articulating the signs of danger: lay experiences of post-Chernobyl radiation risks and effects.

    PubMed

    Kuchinskaya, Olga

    2011-05-01

    This essay examines lay experiences of radiation--the hazard imperceptible with unaided senses--and how these experiences are shaped. Analysis is conducted on the basis of participant observation and interviews in Belarusian rural areas affected after the 1986 Chernobyl nuclear accident. I argue that radiation risks and health effects are not always obvious or immediately observable for those experiencing them, and they should be articulated. The paper compares various opportunities for articulation, including the context of radiological testing and administrative contexts, and describes the kinds of articulations they make possible. I conclude that limited opportunities for articulation result in limited lay recognition of radioactive contamination and their own health effects. The analysis implies that affected lay populations cannot always be assumed to be the most risk-conscious and hold special knowledge about radiation effects independently of scientific and administrative definitions of it.

  4. The history of articulators: the Contributions of Rudolph L. Hanau and his company--part I.

    PubMed

    Engelmeier, Robert L; Belles, Donald M; Starcke, Edgar N

    2010-07-01

    This article is a historical review of the last decade of Rudolph Hanau's life. It covers his introduction to dentistry and explores his prolific articulator designs and contributions to the prosthodontic literature.

  5. [Comparative study of two Arcon articulators with different transference face bows].

    PubMed

    Jiménez-Castellanos Ballesteros, E; López López, M

    1989-11-01

    This paper is about the possible influence that the use of two different face archs on the transference of the upper model, should have in the later regulation of the semiadjustable articulator Arcon type.

  6. Dental Therapy Assistant: Attitudes of Army Dentists.

    ERIC Educational Resources Information Center

    Heid, Theodore H.; Bair, Jeffrey H.

    The U. S. Army Dental Corps has implemented a formal program based on the concept that dental care can be more efficiently and effectively provided with treatment teams composed of one dental officer, two dental therapy assistants, one basic assistant, and the shared support of other auxiliary personnel. Such a team will use three dental treatment…

  7. 21 CFR 872.3240 - Dental bur.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... materials intended for use in the fabrication of dental devices. (b) Classification. Class I (general... 21 Food and Drugs 8 2012-04-01 2012-04-01 false Dental bur. 872.3240 Section 872.3240 Food and... DENTAL DEVICES Prosthetic Devices § 872.3240 Dental bur. (a) Identification. A dental bur is a...

  8. 21 CFR 872.3100 - Dental amalgamator.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... and dental alloy particles, such as silver, tin, zinc, and copper. The mixed dental amalgam material... 21 Food and Drugs 8 2012-04-01 2012-04-01 false Dental amalgamator. 872.3100 Section 872.3100 Food... DEVICES DENTAL DEVICES Prosthetic Devices § 872.3100 Dental amalgamator. (a) Identification. A...

  9. 21 CFR 872.3100 - Dental amalgamator.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... and dental alloy particles, such as silver, tin, zinc, and copper. The mixed dental amalgam material... 21 Food and Drugs 8 2014-04-01 2014-04-01 false Dental amalgamator. 872.3100 Section 872.3100 Food... DEVICES DENTAL DEVICES Prosthetic Devices § 872.3100 Dental amalgamator. (a) Identification. A...

  10. 21 CFR 872.3240 - Dental bur.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... materials intended for use in the fabrication of dental devices. (b) Classification. Class I (general... 21 Food and Drugs 8 2013-04-01 2013-04-01 false Dental bur. 872.3240 Section 872.3240 Food and... DENTAL DEVICES Prosthetic Devices § 872.3240 Dental bur. (a) Identification. A dental bur is a...

  11. 21 CFR 872.3240 - Dental bur.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... materials intended for use in the fabrication of dental devices. (b) Classification. Class I (general... 21 Food and Drugs 8 2014-04-01 2014-04-01 false Dental bur. 872.3240 Section 872.3240 Food and... DENTAL DEVICES Prosthetic Devices § 872.3240 Dental bur. (a) Identification. A dental bur is a...

  12. 21 CFR 872.3100 - Dental amalgamator.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... and dental alloy particles, such as silver, tin, zinc, and copper. The mixed dental amalgam material... 21 Food and Drugs 8 2013-04-01 2013-04-01 false Dental amalgamator. 872.3100 Section 872.3100 Food... DEVICES DENTAL DEVICES Prosthetic Devices § 872.3100 Dental amalgamator. (a) Identification. A...

  13. Dental Health - Multiple Languages: MedlinePlus

    MedlinePlus

    ... 繁體中文 (Chinese - Traditional) PDF California Dental Association Dental Tourism English 牙科旅行 - 繁體中文 (Chinese - Traditional) PDF California Dental ... NEEG MOB - Hmoob (Hmong) California Dental Association Dental Tourism English Kev Kho Hniav Txawv Teb Chaws - Hmoob ( ...

  14. Role of Bed Design and Head-of-Bed Articulation on Patient Migration.

    PubMed

    Davis, Kermit G; Kotowski, Susan E

    2015-01-01

    The ramifications of patient migration toward the foot of the bed in intensive care units are not well understood. Migration may cause shear and friction between the patient and the mattress, reduce elevation of the patient's torso, and require frequent repositioning of the patient. This study assesses how bed design impacts both the amount of migration that patients undergo during head section articulation to 30° and 45° and the extent of torso compression following the articulation.

  15. Design for functional occlusal surface of CAD/CAM crown using VR articulator.

    PubMed

    Ikawa, Tomoko; Ogawa, Takumi; Shigeta, Yuko; Kasama, Shintaro; Hirabayashi, Rio; Fukushima, Shunji; Hattori, Asaki; Suzuki, Naoki

    2011-01-01

    In this present study, we introduce an approach that utilizes the VR articulator to mimic lateral excursions and design a functional occlusal surface. We then take the resultant occlusal surface from this approach and compare it with a conventional method. As a result, we developed a novel CAD/CAM system which can render a functional occlusal surface, via a VR articulator. The marginal fit and occlusion in our CAD/CAM crown was sufficient to apply to the clinic.

  16. Production and perception of legato, portato, and staccato articulation in saxophone playing

    PubMed Central

    Hofmann, Alex; Goebl, Werner

    2014-01-01

    This paper investigates the production and perception of different articulation techniques on the saxophone. In a production experiment, two melodies were recorded that required different effectors to play the tones (tongue-only actions, finger-only actions, combined tongue and finger actions) at three different tempi. A sensor saxophone reed was developed to monitor tongue-reed interactions during performance. In the slow tempo condition, combined tongue-finger actions showed improved timing, compared to the timing of the tongue alone. This observation supports the multiple timer hypothesis where the tongue's timekeeper benefits from a coupling to the timekeeper of the fingers. In the fast tempo condition, finger-only actions were less precise than tongue-only actions and timing precision of combined tongue-finger actions showed the higher timing variability, close to the level of finger-only actions. This suggests that the finger actions have a dominant influence on the overall timing of saxophone performance. In a listening experiment we investigated whether motor expertise in music performance influences the perception of articulation techniques in saxophone performance. Participants with different backgrounds in music making (saxophonists, musicians not playing the saxophone, and non-musicians) attended an AB-X listening test. They had to discriminate between saxophone phrases played with different articulation techniques (legato, portato, staccato). Participants across all three groups discriminated the sound of staccato articulation well from the sound of portato articulation and legato articulation. Errors occurred across all groups of listeners when legato articulation (no tonguing) and portato articulation (soft tonguing) had to be discriminated. Saxophonists' results were superior compared to the results of the other two groups, suggesting that expertise in saxophone playing facilitated the discrimination task. PMID:25076918

  17. Prevalence of Dental Fear and Anxiety amongst Patients in Selected Dental Clinics in Ghana

    ERIC Educational Resources Information Center

    Ofori, Marian A.; Adu-Ababio, F.; Nyako, E. A.; Ndanu, Tom A.

    2009-01-01

    Objective: To find out the prevalence of dental anxiety and fear amongst patients in various selected dental clinics in Accra, Ghana. Study design: Dental patients (n = 279) who had either been exposed to dental treatments or had no prior dental exposure, attending four selected dental clinics in Accra were randomly sampled. They were interviewed…

  18. Dental extractions using improvised equipment.

    PubMed

    Iserson, Kenneth V

    2013-12-01

    Extracting a tooth is the final treatment for multiple dental problems. Persons who are not dentists, however, have little experience with tooth extractions. When a remote setting makes it impossible to send a patient for optimal dental treatment, the clinician may need to extract teeth, sometimes using improvised equipment. The following cases of two patients with three carious, painful molars describe such a situation. The non-dental clinicians had to improvise not only appropriate dental tools, but also personal protective equipment, a functional suction machine, medications for a dental block, a dental chair, and dental consent forms and follow-up instructions in the patients' language. In these cases, they also communicated with their patients through a translator. To prepare to do tooth extractions in remote settings, clinicians should learn and practice dental blocks and review extraction techniques before they deploy. If they must do an extraction, clinicians should use the closest approximation available to the appropriate dental tools. When done correctly, a dental extraction can take some time and should not be rushed. PMID:24076092

  19. Changes in Vowel Articulation with Subthalamic Nucleus Deep Brain Stimulation in Dysarthric Speakers with Parkinson's Disease

    PubMed Central

    Langlois, Mélanie; Prud'Homme, Michel; Cantin, Léo

    2014-01-01

    Purpose. To investigate changes in vowel articulation with the electrical deep brain stimulation (DBS) of the subthalamic nucleus (STN) in dysarthric speakers with Parkinson's disease (PD). Methods. Eight Quebec-French speakers diagnosed with idiopathic PD who had undergone STN DBS were evaluated ON-stimulation and OFF-stimulation (1 hour after DBS was turned off). Vowel articulation was compared ON-simulation versus OFF-stimulation using acoustic vowel space and formant centralization ratio, calculated with the first (F1) and second formant (F2) of the vowels /i/, /u/, and /a/. The impact of the preceding consonant context on articulation, which represents a measure of coarticulation, was also analyzed as a function of the stimulation state. Results. Maximum vowel articulation increased during ON-stimulation. Analyses also indicate that vowel articulation was modulated by the consonant context but this relationship did not change with STN DBS. Conclusions. Results suggest that STN DBS may improve articulation in dysarthric speakers with PD, in terms of range of movement. Optimization of the electrical parameters for each patient is important and may lead to improvement in speech fine motor control. However, the impact on overall speech intelligibility may still be small. Clinical considerations are discussed and new research avenues are suggested. PMID:25400977

  20. Using articulated scene models for dynamic 3d scene analysis in vista spaces

    NASA Astrophysics Data System (ADS)

    Beuter, Niklas; Swadzba, Agnes; Kummert, Franz; Wachsmuth, Sven

    2010-09-01

    In this paper we describe an efficient but detailed new approach to analyze complex dynamic scenes directly in 3D. The arising information is important for mobile robots to solve tasks in the area of household robotics. In our work a mobile robot builds an articulated scene model by observing the environment in the visual field or rather in the so-called vista space. The articulated scene model consists of essential knowledge about the static background, about autonomously moving entities like humans or robots and finally, in contrast to existing approaches, information about articulated parts. These parts describe movable objects like chairs, doors or other tangible entities, which could be moved by an agent. The combination of the static scene, the self-moving entities and the movable objects in one articulated scene model enhances the calculation of each single part. The reconstruction process for parts of the static scene benefits from removal of the dynamic parts and in turn, the moving parts can be extracted more easily through the knowledge about the background. In our experiments we show, that the system delivers simultaneously an accurate static background model, moving persons and movable objects. This information of the articulated scene model enables a mobile robot to detect and keep track of interaction partners, to navigate safely through the environment and finally, to strengthen the interaction with the user through the knowledge about the 3D articulated objects and 3D scene analysis. [Figure not available: see fulltext.

  1. Dental care demand among children with dental insurance.

    PubMed Central

    Grembowski, D; Conrad, D A; Milgrom, P

    1987-01-01

    As the number of families with dental insurance and expenditures for dental care has increased over the past two decades, so has interest in determining cost-sharing effects on dental demand among insureds. Using a representative sample of Pennsylvania Blue Shield children insureds during 1980, we estimate cost-sharing effects on dental demand for basic (diagnostic, preventive, restorative, endodontic, and extraction services) and orthodontic care. Results indicate that cost-sharing has little influence on the probability of using any dental services and basic expenditures. However, the probability of using orthodontic services decreases 2.1 percent when the proportion of orthodontic expenditures paid by the parent increases 10 percent. By reducing the cost of care, cost-sharing reduces social class differences in dental demand common in unisured populations, likely producing public oral health benefits. PMID:2952622

  2. Dental therapists in general dental practices: an economic evaluation.

    PubMed

    Beazoglou, Tryfon J; Lazar, Vickie F; Guay, Albert H; Heffley, Dennis R; Bailit, Howard L

    2012-08-01

    Dental access disparities are well documented and have been recognized as a national problem. Their major cause is the lack of reasonable Medicaid reimbursement rates for the underserved. Specifically, Medicaid reimbursement rates for children average 40 percent below market rates. In addition, most state Medicaid programs do not cover adults. To address these issues, advocates of better oral health for the underserved are considering support for a new allied provider--a dental therapist--capable of providing services at a lower cost per service and in low-income and rural areas. Using a standard economic analysis, this study estimated the potential cost, price, utilization, and dentist's income effects of dental therapists employed in general dental practices. The analysis is based on national general dental practice data and the broadest scope of responsibility for dental therapists that their advocates have advanced, including the ability to provide restorations and extractions to adults and children, training for three years, and minimum supervision. Assuming dental therapists provide restorative, extraction, and pulpal services to patients of all ages and dental hygienists continue to deliver all hygiene services, the mean reduction in a general practice costs ranges between 1.57 and 2.36 percent. For dental therapists treating children only, the range is 0.31 to 0.47 percent. The effects on price and utilization are even smaller. In addition, the effects on most dentists' gross income, hours of work, and net income are negative. The estimated economic impact of dental therapists in the United States on private dental practice is very limited; therefore, the demand for dental therapists by private practices also would probably be very limited.

  3. Predicting dental avoidance among dentally fearful Australian adults.

    PubMed

    Armfield, Jason M

    2013-06-01

    Dental fear is related to poorer oral health outcomes, and this might be explained by the less frequent dental visiting of many fearful people. The objectives of this study were to investigate differences between dentally fearful people who regularly attend the dentist and fearful people who infrequently visit the dentist. A random sample of 1,082 Australians ≥ 15 yr of age completed a mailed questionnaire (response rate = 71.6%), and 191 dentate, high-fear adults (≥ 18 yr of age) were selected for further analysis. Dental avoidance was recorded if a person was currently avoiding or delaying dental care and if he/she had not been to a dentist in the previous 2 yr. Among the selected dentally fearful adults, dental avoidance was predicted by smoking status, toothbrushing frequency, coping strategy use, perceptions of dental visits as uncontrollable and unpredictable, and by anxiety relating to numbness, not knowing what the dentist is going to do, and cost. In a multivariate logistic regression model, smoking, toothbrushing, coping, and anxiety about numbness and cost remained as statistically significant predictors, with the model accounting for 30% of the variance. While several variables were associated with dental avoidance among fearful adults, the nature and causal directions of these associations remain to be established.

  4. Dental problems in athletes.

    PubMed

    Inouye, Jill; McGrew, Chris

    2015-01-01

    Orofacial injuries and diseases occur in athletes, and they may not always have access to dentists. Therefore team physicians should be aware of the common injuries and initial management. Treatment of dental injuries will depend on whether the teeth are primary or permanent. The most common type of fracture is crown fracture, but there are other dental injuries that can lead to future complications if not treated promptly and monitored closely. Tooth avulsions need to be handled properly, and athletes should see a dentist as soon as possible. Despite the urgency of some injuries, other orofacial injuries or diseases, such as lacerations and caries, should not be overlooked. Proper education and use of mouth guards can assist athletes in reducing their risk of orofacial injuries. PMID:25574879

  5. Dental Assisting Education in California.

    ERIC Educational Resources Information Center

    California State Dept. of Education, Sacramento. Bureau of Industrial Education.

    A survey of 22 dental assisting programs showed an average of 1,124 hours of instruction in dental assisting for 15 four-semester, 955 for three three-semester, and 1,042 for four two-semester programs. The average instructional hours for the four-semester programs were 48 in introduction to dental assisting, 179 in the life sciences, 221 in the…

  6. Fluorescence of dental porcelain.

    PubMed

    Monsénégo, G; Burdairon, G; Clerjaud, B

    1993-01-01

    This study of the fluorescence of natural enamel and of dental ceramics shows the fluorescence of ceramics not containing rare earths decreases when the color saturation increases; the fluorescence of samples of the same shade guide are not homogenous; some guides show a strong green fluorescence; and two shade guides of the same origin can present completely different fluorescence. The cementing medium can affect the fluorescence of a ceramic prosthesis. PMID:8455155

  7. Harvesting dental stem cells - Overview

    PubMed Central

    Sunil, P. M.; Manikandan, Ramanathan; Muthumurugan; Yoithapprabhunath, Thukanayakanpalayam Ragunathan; Sivakumar, Muniapillai

    2015-01-01

    Dental stem cells have recently become one of the widely researched areas in dentistry. Ever since the identification of stem cells from various dental tissues like deciduous teeth, dental papilla, periodontal ligament and third molars, storing them for future use for various clinical applications was being explored. Dental stem cells were harvested and isolated using various techniques by different investigators and laboratories. This article explains the technical aspects of preparing the patient, atraumatic and aseptic removal of the tooth and its safe transportation and preservation for future expansion. PMID:26538883

  8. Dental injuries during general anaesthesia.

    PubMed

    Chadwick, R G; Lindsay, S M

    1996-04-01

    Although most anaesthetic textbooks cite dental injury as a complication of endotracheal intubation few studies have examined the extent and nature of the problem. Such damage however, formed the basis for one-third of all confirmed or potential anaesthetic claims notified to the Medical Protection Society between 1977 and 1986. This article seeks to explore the extent of the problem, outline predisposing factors, summarise current prophylactic measures and make recommendations to reduce the overall incidence. Increased awareness of the problem, by both anaesthetists and dental surgeons, coupled with appropriate prophylactic measures may result in a reduced incidence of dental injury arising from general anaesthesia. Given the high incidence of dental damage we recommend that all patients undergoing a surgical operation under endotracheal intubation should have a pre-operative dental check wherever possible. Clearly, the first dental examination would be conducted by an anaesthetist familiar with the predisposing factors. Where he/she considers there to be a higher than average risk of dental damage occurring during intubation a more specialised examination should be conducted by a dental surgeon. It may, where appropriate, be possible for remedial dental treatment to be carried out and customised mouth guards to be constructed prior to the operation. Obviously such recommendations have certain financial implications and would have to be subject to controlled cost-benefit analysis before their widespread application. PMID:8935289

  9. Coinsurance effects on dental prices.

    PubMed

    Grembowski, D; Conrad, D A

    1986-01-01

    For many Americans the cost of dental services represents a barrier to receiving regular dental care and maintaining proper oral health. The recent growth of the dental insurance industry, however, may partly offset this price barrier among insureds. Our purpose is to examine the relationship between coinsurance and dental prices for 16 dental services among a sample of Pennsylvania Blue Shield (PBS) adult insureds. The dependent price measure is the annual average gross price paid for 16 specific preventive, restorative, periodontic, endodontic, prosthodontic, and surgical dental services. Independent variables in the price model include the insured's age, education, coinsurance rates, time costs, market area, non-wage income, oral health status, area dentist-population ratio and usual source of care. Data sources are 1980 PBS claims and coinsurance rate data and a mail survey of sampled insureds. OLS regression analysis reveals that the model's independent variables explain little dental price variation. No variable is consistently significant across services, but market area, coinsurance rates, and time costs alternately dominate across equations. These results suggest that, among adult insureds, coinsurance and time costs influence dental fees in a minority of dental services. Insurance reduces the patient's sensitivity to money price, and non-price factors correspondingly seem to become more important in patient search.

  10. Sparse appearance model-based algorithm for automatic segmentation and identification of articulated hand bones

    NASA Astrophysics Data System (ADS)

    Reda, Fitsum A.; Peng, Zhigang; Liao, Shu; Shinagawa, Yoshihisa; Zhan, Yiqiang; Hermosillo, Gerardo; Zhou, Xiang Sean

    2014-03-01

    Automatic and precise segmentation of hand bones is important for many medical imaging applications. Although several previous studies address bone segmentation, automatically segmenting articulated hand bones remains a challenging task. The highly articulated nature of hand bones limits the effectiveness of atlas-based segmentation methods. The use of low-level information derived from the image-of-interest alone is insufficient for detecting bones and distinguishing boundaries of different bones that are in close proximity to each other. In this study, we propose a method that combines an articulated statistical shape model and a local exemplar-based appearance model for automatically segmenting hand bones in CT. Our approach is to perform a hierarchical articulated shape deformation that is driven by a set of local exemplar-based appearance models. Specifically, for each point in the shape model, the local appearance model is described by a set of profiles of low-level image features along the normal of the shape. During segmentation, each point in the shape model is deformed to a new point whose image features are closest to the appearance model. The shape model is also constrained by an articulation model described by a set of pre-determined landmarks on the finger joints. In this way, the deformation is robust to sporadic false bony edges and is able to fit fingers with large articulations. We validated our method on 23 CT scans and we have a segmentation success rate of ~89.70 %. This result indicates that our method is viable for automatic segmentation of articulated hand bones in conventional CT.

  11. Priorities for future innovation, research, and advocacy in dental restorative materials.

    PubMed

    Watson, T; Fox, C H; Rekow, E D

    2013-11-01

    Innovations in materials science, both within and outside of dentistry, open opportunities for the development of exciting direct restorative materials. From rich dialog among experts from dental and non-dental academic institutions and industry, as well as those from policy, research funding, and professional organizations, we learned that capitalizing on these opportunities is multifactorial and far from straightforward. Beginning from the point when a restoration is needed, what materials, delivery systems, and skills are needed to best serve the most people throughout the world's widely varied economic and infrastructure systems? New research is a critical element in progress. Effective advocacy can influence funding and drives change in practice and policy. Here we articulate both research and advocacy priorities, with the intention of focusing the energy and expertise of our best scientists on making a difference, bringing new innovations to improve oral health. PMID:24129817

  12. Evaluation of senior Brazilian dental students about mouth preparation and removable partial denture design.

    PubMed

    Neto, Arcelino Farias; Duarte, Antônio Ricardo Calazans; Shiratori, Fábio Kenji; de Alencar e Silva Leite, Pedro Henrique; Rizzatti-Barbosa, Célia Marisa; Bonachela, Wellington Cardoso

    2010-11-01

    This study aimed to evaluate the knowledge of senior dental students about mouth preparation and removable partial denture (RPD) design. Two hundred sixty-six senior students from eleven dental schools in the State of São Paulo, Brazil, comprised the sample. The subjects examined two partially edentulous casts mounted on a semiadjustable articulator, answered a questionnaire regarding the treatment plan, and drew the RPD design. The casts consisted of Kennedy Class III, modification 1 maxillary arch and Class II mandibular arch. Ninety percent of the students believed that mouth preparation should be performed although no one was able to name all necessary procedures. For the maxillary arch, 12 percent of the denture designs were completely appropriate, 51 percent were partially appropriate, and 37 percent were inappropriate. For the mandibular arch, the results were 3 percent, 40 percent, and 57 percent, respectively.

  13. Structural characterization of a first-generation articulated-truss joint for space crane application

    NASA Technical Reports Server (NTRS)

    Sutter, Thomas R.; Wu, K. Chauncey; Riutort, Kevin T.; Laufer, Joseph B.; Phelps, James E.

    1992-01-01

    A first-generation space crane articulated-truss joint was statically and dynamically characterized in a configuration that approximated an operational environment. The articulated-truss joint was integrated into a test-bed for structural characterization. Static characterization was performed by applying known loads and measuring the corresponding deflections to obtain load-deflection curves. Dynamic characterization was performed using modal testing to experimentally determine the first six mode shapes, frequencies, and modal damping values. Static and dynamic characteristics were also determined for a reference truss that served as a characterization baseline. Load-deflection curves and experimental frequency response functions are presented for the reference truss and the articulated-truss joint mounted in the test-bed. The static and dynamic experimental results are compared with analytical predictions obtained from finite element analyses. Load-deflection response is also presented for one of the linear actuators used in the articulated-truss joint. Finally, an assessment is presented for the predictability of the truss hardware used in the reference truss and articulated-truss joint based upon hardware stiffness properties that were previously obtained during the Precision Segmented Reflector (PSR) Technology Development Program.

  14. Scan-based volume animation driven by locally adaptive articulated registrations.

    PubMed

    Rhee, Taehyun; Lewis, J P; Neumann, Ulrich; Nayak, Krishna S

    2011-03-01

    This paper describes a complete system to create anatomically accurate example-based volume deformation and animation of articulated body regions, starting from multiple in vivo volume scans of a specific individual. In order to solve the correspondence problem across volume scans, a template volume is registered to each sample. The wide range of pose variations is first approximated by volume blend deformation (VBD), providing proper initialization of the articulated subject in different poses. A novel registration method is presented to efficiently reduce the computation cost while avoiding strong local minima inherent in complex articulated body volume registration. The algorithm highly constrains the degrees of freedom and search space involved in the nonlinear optimization, using hierarchical volume structures and locally constrained deformation based on the biharmonic clamped spline. Our registration step establishes a correspondence across scans, allowing a data-driven deformation approach in the volume domain. The results provide an occlusion-free person-specific 3D human body model, asymptotically accurate inner tissue deformations, and realistic volume animation of articulated movements driven by standard joint control estimated from the actual skeleton. Our approach also addresses the practical issues arising in using scans from living subjects. The robustness of our algorithms is tested by their applications on the hand, probably the most complex articulated region in the body, and the knee, a frequent subject area for medical imaging due to injuries.

  15. Acoustic cues discriminating german obstruents in place and manner of articulation.

    PubMed

    Hoelterhoff, Julia; Reetz, Henning

    2007-02-01

    This study focuses on the extraction of robust acoustic cues of labial and alveolar voiceless obstruents in German and their acoustic differences in the speech signal to distinguish them in place and manner of articulation. The investigated obstruents include the affricates [pf] and [ts], the fricatives [f] and [s] and the stops [p] and [t]. The target sounds were analyzed in word-initial and word-medial positions. The speech data for the analysis were recorded in a natural environment, deliberately containing background noise to extract robust cues only. Three methods of acoustic analysis were chosen: (1) temporal measurements to distinguish the respective obstruents in manner of articulation, (2) static spectral characteristics in terms of logarithmic distance measure to distinguish place of articulation, and (3) amplitudinal analysis of discrete frequency bands as a dynamic approach to place distinction. The results reveal that the duration of the target phonemes distinguishes these in manner of articulation. Logarithmic distance measure, as well as relative amplitude analysis of discrete frequency bands, identifies place of articulation. The present results contribute to the question, which properties are robust with respect to variation in the speech signal.

  16. In-Flight Position Calibration of the Cassini Articulated Reaction Wheel Assembly

    NASA Technical Reports Server (NTRS)

    Brown, Todd S.

    2012-01-01

    NASA's long-lived Cassini-Huygens spacecraft is currently in its 14th year of flight and in the midst of its second, and final, extended mission. Cassini is a massive interplanetary spacecraft that is three axis stabilized and can maintain attitude control using either its reaction control system thrusters or using reaction wheel control. Cassini has four identical reaction wheels, of which three are mutually orthogonal and have a fixed orientation. The fourth reaction wheel has an articulation motor that allows this reaction wheel to be aligned with the momentum direction of any of the other three fixed reaction wheels. The articulation motor allows this reaction wheel to be used as a replacement for any of the other three wheels without any performance degradation. However, due to limitations in the design of this backup system, there are few telemetric indications of the orientation of this reaction wheel following an articulation. This investigation serves to outline the procedures that have been developed by the Cassini Attitude and Articulation Control Subsystem to calibrate the position of the articulated reaction wheel assembly in the event that the momentum direction of this reaction wheel must be reoriented.

  17. Development of a novel articulator that reproduced jaw movement with six-degree-of-freedom.

    PubMed

    Nishigawa, Keisuke; Satsuma, Toyoko; Shigemoto, Shuji; Bando, Eiichi; Nakano, Masanori; Ishida, Osamu

    2007-06-01

    A novel robotic articulator that reproduced a six-degree-of-freedom jaw movement was developed and tested. A precise six-axis micro-positioning stage was employed for this articulator. A high-resolution jaw-tracking device measured the functional jaw movement of the patient and a six-axis micro-positioning stage reproduced recorded jaw movement data. A full veneer crown restoration was fabricated with this articulator system. A working cast was mounted on the positioning stage of the articulator. An occlusal table with soft wax was attached on the cast tooth die, and the jaw movements were reproduced to create a functionally generated path on the occlusal table. The finished occlusal record was used to obtain the wax pattern for the crown. In this subject, no intra-oral occlusal adjustment was necessary for setting the finished full veneer crown. Since this articulator could perform a precise reproduction of the dynamic jaw motion during the functional jaw movement, this system has potential to improve accuracy of the prosthetic teeth occlusion.

  18. [Effect of interocclusal records on the condylar path of the articulator].

    PubMed

    Angyal, János; Bukovinszki, Katalin; Keszthelyi, Gusztáv

    2002-04-01

    Although there are studies on materials used for interocclusal records, there are no scientific data how the condylar path is influenced by the positional interocclusal records. The purpose of this in vitro study was to determine the effects of different interocclusal mediums on condylar inclination of the articulator. The materials selected for this experiment were: two addition type silicone pastes, two silicone putty materials and two waxes. The samples of protrusive records were performed on a Quick-Master semiadjustable articulator (FAG Dentaire). The same pre-established eminentia angles were used during the experiment for each type of materials. To improve the control of the condylar angles a protractor was mounted to the upper member of the articulator at right angels to each condylar fossa housing. A stylus moving simultaneously with the condylar fossa marked the eminentia angle on the protractor. 108 interocclusal records were performed and in 24 hours they were returned to the articulator. Then the articulator was adjusted and the settings of the eminentia angle were recorded. Numerical deviations between the pre-established and the adjusted settings in degrees were subjected to statistical analysis. The results indicated that these deviations for addition type silicones were significantly smaller than that of the other materials. The two waxes proved to be the least accurate materials. It is concluded that the condylar inclination is influenced by the properties of the registration materials, which may increase the shortcomings of the protrusive bite records.

  19. The Costs of Dental Education.

    ERIC Educational Resources Information Center

    D'Eustachio, Richard W.

    1993-01-01

    This brief statement offers 10 questions for consideration by American Dental Association (ADA) officials and others concerned with the burdensome indebtedness graduates often incur for their dental education. Questions ask for assessments in such areas as school operating costs, tuition, school support, loan forgiveness, and how the ADA can help…

  20. Dosimetric considerations in dental applications

    NASA Technical Reports Server (NTRS)

    Goble, J. C.

    1978-01-01

    The integration of the Lixiscope into dental procedures was studied and compared with conventional dental radiographic techniques. It was found that through the use of intraoral sealed sources in conjunction with microchannel plate technology, the Lixiscope gives increased diagnostic information with decreased radiation dosage.

  1. Dental Chairside Technique. Student's Manual.

    ERIC Educational Resources Information Center

    Apfel, Maura; Weaver, Trudy Karlene

    This manual is part of a series dealing with skills and information needed by students in dental assisting. The individualized student materials are suitable for classroom, laboratory, or cooperative training programs. This student manual contains four units covering the following topics: local anesthesia; dental office emergencies; oral hygiene;…

  2. [Biomechanics of single dental implants].

    PubMed

    Zagorskiĭ, V A; Zagorskiĭ, V V

    2013-01-01

    Bone tissues of human skull, jawbones and hard dental tissues were formed formed by the influence of chewing loads which are functional irritants used for maintaining their physical qualities. Knowledge of tensions and deformations in bony structures allows to increase their joint work with dental implants installed.

  3. Dental Assisting Competencies. Final Report.

    ERIC Educational Resources Information Center

    Richards, Beverly; And Others

    This document contains dental assisting competencies and competency-based performance objectives, learning activities, resources, and evaluation procedures for each competency that was adapted and developed by instructors of dental assisting to suit the needs and legal parameters of Pennsylvania. The competencies and associated elements are…

  4. Dental Laboratory Technology Program Guide.

    ERIC Educational Resources Information Center

    Georgia Univ., Athens. Dept. of Vocational Education.

    This program guide contains the standard dental laboratory technology curriculum for both diploma programs and associate degree programs in technical institutes in Georgia. The curriculum encompasses the minimum competencies required for entry-level workers in the dental laboratory technology field. The general information section contains the…

  5. Emerging Dental Specialties and Ethics.

    PubMed

    Brown, Ronald S; Mashni, Michael

    2015-01-01

    This paper discusses ethical dimensions related to the formal recognition of emerging dental specialties. It explores several issues related to the potential emergence of several new dental specialty areas. There are good reasons that dentistry should open the door to these new specialties, and patients would benefit. The ethical considerations for and against formal acceptance are examined.

  6. Emerging Dental Specialties and Ethics.

    PubMed

    Brown, Ronald S; Mashni, Michael

    2015-01-01

    This paper discusses ethical dimensions related to the formal recognition of emerging dental specialties. It explores several issues related to the potential emergence of several new dental specialty areas. There are good reasons that dentistry should open the door to these new specialties, and patients would benefit. The ethical considerations for and against formal acceptance are examined. PMID:26697653

  7. Teaching Photography in Dental Schools.

    ERIC Educational Resources Information Center

    Chuman, Ted A.; Hummel, Susan K.

    1992-01-01

    Two surveys investigated the extent of photography instruction in dental schools. The first survey of 53 schools revealed that 36% had formal dental photography programs. Of 21 photography instructors surveyed in the second study, 67% had no formal training, many knew little about texts or resources, and techniques and knowledge varied. (MSE)

  8. Health Instruction Packages: Dental Assisting.

    ERIC Educational Resources Information Center

    McEnery, Paula

    Text, illustrations, and exercises are utilized in this set of four learning modules to instruct dental assisting students in various office skills. The first module, "Dental Office Telephone Techniques," examines the qualities of a good telephone voice and demeanor and provides guidelines for taking a message and handling various telephone…

  9. Dentistry and Dental Hygiene Handbook.

    ERIC Educational Resources Information Center

    New York State Education Dept., Albany. Office of the Professions.

    The handbook contains laws, rules, and regulations of the New York State Education Department that govern dentistry and dental hygiene practice in the state. It describes licensure requirements and includes complete application forms and instructions for obtaining license and first registration as a dentist and dental hygienist. Applicants are…

  10. Clinical Guidelines. Dental Hygiene Program.

    ERIC Educational Resources Information Center

    Branson, Bonnie

    This manual contains information concerning the policies and procedures of the Southern Illinois University-Carbondale Dental Hygiene Clinic. The manual is presented in a question/answer format for the information and convenience of dental hygiene students in the program, and is intended to answer their questions concerning clinical policies and…

  11. Dental Health: The Basic Facts

    MedlinePlus

    ... after breakfast and before bedtime n Using a tooth-paste with fluoride in it n Flossing daily n Using a tongue scraper or brushing the tongue daily Dental Health | 1 n ... reporting any bleeding gums, tooth or jaw pain or tooth sensitivity Routine dental ...

  12. Dental visits, dental health status and need for dental treatment in a Danish industrial population.

    PubMed

    Petersen, P E

    1983-01-01

    The purpose of the present investigation was to study the utilization of dental services, the distribution of dental diseases and treatment needs in a Danish industrial population. The study covered the male population at a Danish shipyard, and a sample of 988 workers and clerical and managerial staff was drawn by stratified random sampling. 841 persons were interviewed regarding dental visits and attitudes towards dental health services and data on dental health and treatment needs were collected. 61% of the participants aged 15-64 years made regular dental visits at least once a year. The percentages of regular visitors varied according to age and occupation, from 68 to 82% among clerical staff to 34 to 51% among workers. The mean DMF-T increased from 16.6 in the age group 15-24 to 27.0 among the 55-64-year-olds. Untreated dental decay was predominant among workers and persons never seeing a dentist, whereas there were more filled teeth and fewer missing teeth among staff and regular visitors. The periodontal status was less satisfactory in the older age groups and among workers, and most denture wearers were found in the age group 35-64 and among workers. Concordant to the findings on dental health status, dental treatment needs due to caries and periodontal disease as well as prosthetic treatment needs varied according to age, occupation and dental visits. More radical treatment types were needed in the older age groups, among workers and non-regular visitors. The present study seems to indicate that dental diseases in the adult Danish population are not under control.

  13. Dental, Dental Hygiene, and Graduate Students' and Faculty Perspectives on Dental Hygienists' Professional Role and the Potential Contribution of a Peer Teaching Program.

    PubMed

    McComas, Martha J; Inglehart, Marita R

    2016-09-01

    The changing role of dental hygienists deserves dental and dental hygiene educators' attention. The first aim of this survey study was to assess University of Michigan dental, dental hygiene, and graduate students' and faculty members' perceptions of dental hygienists' roles; their attitudes and behaviors related to clinical interactions between dental and dental hygiene students; and perceived benefits of engaging dental hygiene students as peer teachers for dental students. The second aim was to assess whether one group of dental students' experiences with dental hygiene student peer teaching affected their perceptions of the dental hygiene profession. Survey respondents were 57 dental hygiene students in all three years of the program (response rate 60% to 100%); 476 dental students in all four years (response rate 56% to 100%); 28 dental and dental hygiene graduate students (response rate 28%); and 67 dental and dental hygiene faculty members (response rate 56%). Compared to the other groups, dental students reported the lowest average number of services dental hygienists can provide (p≤0.001) and the lowest average number of patient groups for which dental hygienists can provide periodontal care (p<0.001). Dental students also had the least positive attitudes about clinical interactions between dental hygiene and dental students (p<0.001) and perceived the fewest benefits of dental hygiene student peer teaching (p<0.001) before experiencing peer teaching. After experiencing dental hygiene student peer teaching, the dental students' perceptions of dental hygienists' roles, attitudes about clinical interactions with dental hygienists, and perceived benefits of dental hygiene student peer teachers improved and were more positive than the responses of their peers with no peer teaching experiences. These results suggest that dental hygiene student peer teaching may improve dental students' perceptions of dental hygienists' roles and attitudes about

  14. Dental, Dental Hygiene, and Graduate Students' and Faculty Perspectives on Dental Hygienists' Professional Role and the Potential Contribution of a Peer Teaching Program.

    PubMed

    McComas, Martha J; Inglehart, Marita R

    2016-09-01

    The changing role of dental hygienists deserves dental and dental hygiene educators' attention. The first aim of this survey study was to assess University of Michigan dental, dental hygiene, and graduate students' and faculty members' perceptions of dental hygienists' roles; their attitudes and behaviors related to clinical interactions between dental and dental hygiene students; and perceived benefits of engaging dental hygiene students as peer teachers for dental students. The second aim was to assess whether one group of dental students' experiences with dental hygiene student peer teaching affected their perceptions of the dental hygiene profession. Survey respondents were 57 dental hygiene students in all three years of the program (response rate 60% to 100%); 476 dental students in all four years (response rate 56% to 100%); 28 dental and dental hygiene graduate students (response rate 28%); and 67 dental and dental hygiene faculty members (response rate 56%). Compared to the other groups, dental students reported the lowest average number of services dental hygienists can provide (p≤0.001) and the lowest average number of patient groups for which dental hygienists can provide periodontal care (p<0.001). Dental students also had the least positive attitudes about clinical interactions between dental hygiene and dental students (p<0.001) and perceived the fewest benefits of dental hygiene student peer teaching (p<0.001) before experiencing peer teaching. After experiencing dental hygiene student peer teaching, the dental students' perceptions of dental hygienists' roles, attitudes about clinical interactions with dental hygienists, and perceived benefits of dental hygiene student peer teachers improved and were more positive than the responses of their peers with no peer teaching experiences. These results suggest that dental hygiene student peer teaching may improve dental students' perceptions of dental hygienists' roles and attitudes about

  15. Biostatistical consultation for dental research.

    PubMed

    Clive, Jonathan

    2002-01-01

    Dental science researchers do not really need a detailed, ready-at-hand knowledge of statistics to design and perform high quality scientific research. Although the acquisition and utilization of such knowledge by dental researchers is not discouraged, it is proposed that it is more important for dental researchers to be committed to developing and maintaining a long term, ongoing, interactive consulting relationship with a biostatistician. The nature of this relationship will depend in large part on the complexity of the dental research being conducted. While the statistical consultant will assist in interpreting analytic results for the dental researcher, the latter will need to provide extensive input in assisting in the estimation of sample size and power, and for expressing scientific hypotheses in statistical terms so that the appropriate data analytic methodology can be specified.

  16. Current trends in dental implants

    PubMed Central

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

    2014-01-01

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

  17. Current trends in dental implants.

    PubMed

    Gaviria, Laura; Salcido, John Paul; Guda, Teja; Ong, Joo L

    2014-04-01

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

  18. Nanotechnology for dental implants.

    PubMed

    Tomsia, Antoni P; Lee, Janice S; Wegst, Ulrike G K; Saiz, Eduardo

    2013-01-01

    With the advent of nanotechnology, an opportunity exists for the engineering of new dental implant materials. Metallic dental implants have been successfully used for decades, but they have shortcomings related to osseointegration and mechanical properties that do not match those of bone. Absent the development of an entirely new class of materials, faster osseointegration of currently available dental implants can be accomplished by various surface modifications. To date, there is no consensus regarding the preferred method(s) of implant surface modification, and further development will be required before the ideal implant surface can be created, let alone become available for clinical use. Current approaches can generally be categorized into three areas: ceramic coatings, surface functionalization, and patterning on the micro- to nanoscale. The distinctions among these are imprecise, as some or all of these approaches can be combined to improve in vivo implant performance. These surface improvements have resulted in durable implants with a high percentage of success and long-term function. Nanotechnology has provided another set of opportunities for the manipulation of implant surfaces in its capacity to mimic the surface topography formed by extracellular matrix components of natural tissue. The possibilities introduced by nanotechnology now permit the tailoring of implant chemistry and structure with an unprecedented degree of control. For the first time, tools are available that can be used to manipulate the physicochemical environment and monitor key cellular events at the molecular level. These new tools and capabilities will result in faster bone formation, reduced healing time, and rapid recovery to function.

  19. Adaptation of an articulated fetal skeleton model to three-dimensional fetal image data

    NASA Astrophysics Data System (ADS)

    Klinder, Tobias; Wendland, Hannes; Wachter-Stehle, Irina; Roundhill, David; Lorenz, Cristian

    2015-03-01

    The automatic interpretation of three-dimensional fetal images poses specific challenges compared to other three-dimensional diagnostic data, especially since the orientation of the fetus in the uterus and the position of the extremities is highly variable. In this paper, we present a comprehensive articulated model of the fetal skeleton and the adaptation of the articulation for pose estimation in three-dimensional fetal images. The model is composed out of rigid bodies where the articulations are represented as rigid body transformations. Given a set of target landmarks, the model constellation can be estimated by optimization of the pose parameters. Experiments are carried out on 3D fetal MRI data yielding an average error per case of 12.03+/-3.36 mm between target and estimated landmark positions.

  20. Punishment contingencies for the reduction of incorrect responses during articulation instruction.

    PubMed

    Costello, J; Ferrer, J

    1976-03-01

    A comparison was made between the effects of punishment combined with positive reinforcement and reinforcement alone for the reduction of incorrect articulation responses. Three different punishers (a buzzer, response cost, and "No!") were studied for six young children while they were receiving programmed articulation instruction. The results indicated (1) that punishment in combination with positive reinforcement was generally more effective than positive reinforcement alone; (2) that whether or not a particular stimulus acted as a punisher could be determined only be empirical demonstration; and (3) that the introduction of punishment contingencies did not produce increased rates of disruptive, off-task behaviors. Conversely, off-task behaviors tended to increase in rate when punishement contingencies for articulation responses were removed. PMID:965504

  1. Relationships between Speech Intelligibility and Word Articulation Scores in Children with Hearing Loss

    PubMed Central

    Ertmer, David J.

    2012-01-01

    Purpose This investigation sought to determine whether scores from a commonly used word-based articulation test are closely associated with speech intelligibility in children with hearing loss. If the scores are closely related, articulation testing results might be used to estimate intelligibility. If not, the importance of direct assessment of intelligibility would be reinforced. Methods Forty-four children with hearing losses produced words from the Goldman-Fristoe Test of Articulation-2 and sets of 10 short sentences. Correlation analyses were conducted between scores for seven word-based predictor variables and percent-intelligible scores derived from listener judgments of stimulus sentences. Results Six of seven predictor variables were significantly correlated with percent-intelligible scores. However, regression analysis revealed that no single predictor variable or multi- variable model accounted for more than 25% of the variability in intelligibility scores. Implications The findings confirm the importance of assessing connected speech intelligibility directly. PMID:20220022

  2. [The organization of specialized care in case of pathology of foot and talocrural articulation].

    PubMed

    Pakhomov, I A

    2010-01-01

    The nozoological structure of podiatric pathology in Novosibirsk oblast is represented mainly by the injuries of talocrural articulation (39.2% of examined patients), deformation of foot (20.7%) and degenerative lesion of foot (15.9%), fractures of heel bone (4.2%). This pathology has higher social significance. The main cause of disability is the deforming arthritis of talocrural articulation (48.5%) and subtalar articulation (20.3%). The model of specialized podiatric care was developed and approved in the functioning of Novosibirsk specialized podiatric center. The model includes outpatient, diagnostic, treatment, rehabilitation stages. The implementation of this approach permits to avoid the re-appealability to municipal medical care system and application to the specialized medical institution. This approach precipitates the period of care delivering and decreases the possibility of disabling patients due to non-effective treatment of podiatric pathology in common curative institution.

  3. Articulation in early and late bilinguals' two languages: evidence from functional magnetic resonance imaging.

    PubMed

    Frenck-Mestre, Cheryl; Anton, Jean Luc; Roth, Muriel; Vaid, Jyotsna; Viallet, François

    2005-05-12

    The network of cortical and subcortical regions that contribute to articulation was examined in bilinguals using functional magnetic resonance imaging. Participants were all fluent in French and English: half were bilingual from birth and half were 'late bilinguals' who had learned French after the age of 12. Overt articulation resulted in the bilateral activation of the motor cortex, basal ganglia and cerebellum, and also the supplementary motor area, independent of the language spoken. Furthermore, the threshold and extent of the network involved in articulation was identical for the two bilingual groups with the exception of greater variation in the left putamen for the late bilinguals. These data challenge claims that age of acquisition results in fundamental differences in the neural substrates that subserve language in bilinguals.

  4. Development of a Wave Energy -Responsive Self-Actuated Blade Articulation Mechanism for an OWC Turbine

    SciTech Connect

    Francis A. Di Bella

    2010-06-01

    The Phase I SBIR effort completed the feasibility design, fabrication, and wind tunnel testing of a self-actuated blade articulation mechanism that uses a torsion bar and a lightweight airfoil to affect the articulation of the Wells airfoil. The articulation is affected only by the air stream incident on the airfoil. The self-actuating blade eliminates the complex and costly linkage mechanism that is now needed to perform this function on either a variable pitch Wells-type or Dennis-Auld air turbine. Using the results reported by independent researchers, the projected improvement in the Wells-type turbine efficiency is 20-40%, in addition to an increase in the operating air flow range by 50-100%, therefore enabling a smaller or slower single turbine to be used.

  5. Dental impression materials.

    PubMed

    Perry, Rachel

    2013-01-01

    It is clear that many impression materials are available to the veterinary dentist. They each have different inherent properties, handling characteristics, and indications for use. A thorough understanding of these concepts is essential if the veterinarian and laboratory technician are to produce meaningful and accurate reproductions of oral structures. New products are constantly being introduced to the dental market, with fantastic claims for ease of use and reproduction of detail. The reader is urged to seek independent research findings when assessing such claims, and make decisions founded in the highest possible levels of evidence.

  6. Dental impression materials.

    PubMed

    Perry, Rachel

    2013-01-01

    It is clear that many impression materials are available to the veterinary dentist. They each have different inherent properties, handling characteristics, and indications for use. A thorough understanding of these concepts is essential if the veterinarian and laboratory technician are to produce meaningful and accurate reproductions of oral structures. New products are constantly being introduced to the dental market, with fantastic claims for ease of use and reproduction of detail. The reader is urged to seek independent research findings when assessing such claims, and make decisions founded in the highest possible levels of evidence. PMID:24006720

  7. The american dental dream.

    PubMed

    Hodges, Nathan

    2015-01-01

    The American Dental Dream-the cultural desire for straight, white teeth-is difficult, if not impossible, for poor and working-class people to achieve. Using ethnographic fiction, autoethnography, poetry, and qualitative interviewing, I brush away the taken-for-granted assumptions about teeth. I explore the personal, relational, and structural consequences of this cultural desire, and show how social class writes itself on our bodies. I write these culture-centered teeth tales to show how one might cope with their teeth. PMID:25257392

  8. The american dental dream.

    PubMed

    Hodges, Nathan

    2015-01-01

    The American Dental Dream-the cultural desire for straight, white teeth-is difficult, if not impossible, for poor and working-class people to achieve. Using ethnographic fiction, autoethnography, poetry, and qualitative interviewing, I brush away the taken-for-granted assumptions about teeth. I explore the personal, relational, and structural consequences of this cultural desire, and show how social class writes itself on our bodies. I write these culture-centered teeth tales to show how one might cope with their teeth.

  9. The Prevalence of Dental Anxiety in Patients of a University Dental Clinic

    ERIC Educational Resources Information Center

    Woodmansey, Karl F.

    2005-01-01

    Dental anxiety remains a pervasive barrier to dental treatment for many individuals, including college-age patients. In this article, the author reviews dental anxiety and examines the usefulness of assessment instruments for identifying dental anxiety. Using 2 unique assessment instruments, he examines the prevalence of dental anxiety in his…

  10. Dental biometrics: alignment and matching of dental radiographs.

    PubMed

    Chen, Hong; Jain, Anil K

    2005-08-01

    Dental biometrics utilizes dental radiographs for human identification. The dental radiographs provide information about teeth, including tooth contours, elative positions of neighboring teeth, and shapes of the dental work (e.g., crowns, fillings, and bridges). The proposed system has two main stages: feature extraction and matching. The feature extraction stage uses anisotropic diffusion to enhance the images and a Mixture of Gaussians model to segment the dental work. The matching stage has three sequential steps: tooth-level matching, computation of image distances, and subject identification. In the tooth-level matching step, tooth contours are matched using a shape registration method, and the dental work is matched on overlapping areas. The distance between the tooth contours and the distance between the dental work are then combined using posterior probabilities. In the second step, the tooth correspondences between the given query (postmortem) radiograph and the database (antemortem) radiograph are established. A distance based on the corresponding teeth is then used to measure the similarity between the two radiographs. Finally, all the distances between the given postmortem radiographs and the antemortem radiographs that provide candidate identities are combined to establish the identity of the subject associated with the postmortem radiographs.

  11. [Dental prostheses and dental impressions from a hygienic viewpoint].

    PubMed

    Engelhardt, J P

    1986-12-01

    Dentures, dental impressions, removable orthodontic appliances and all dental technical devices, which are part of any dental treatment are parts as well of a potential crosscontamination chain in dental treatment. Most of those items do not tolerate heat as a sure sterilization medium. For disinfection, chemical disinfectant solutions may be used as far as they work properly and as they are tolerated by the materials in question. Though, one can report some progress in disinfection of dentures and impressions, there are still questions open depending on safety and/or compatibility of the particular materials. For disinfection of removable dentures chlorine-yielding preparations such as Maranon can be recommended. Peracid preparations, such as Sekusept, Sekusept steril and Dentavon may be useful for disinfection of dental impressions. To do the possible means to reduce the infection risk for all persons involved in the dental treatment, patient, dentist, dental technician and all auxiliary persons. This includes both, active hygiene provisions as sterilization and disinfection, as well as possible passive self protection.

  12. Undergraduate dental English education in Japanese dental schools.

    PubMed

    Rodis, Omar M M; Matsumura, Seishi; Kariya, Naoyuki; Nishimura, Michiko; Yoshida, Toshiko

    2013-05-01

    Dental schools in Japan are among many worldwide whose medium of instruction is not in English. With advances in science, technology, and communication, the demand for the globalization of professions increases. At present, dental schools in Asia, the Middle East, and Europe have started revising their dental curricula to either include English courses for dentistry or offer a full English dental curriculum. In Japan, dental English courses started to be introduced into curricula in the early 1990s. However, a survey conducted in 1999 found that English courses were not offered in Japan's twenty-nine dental schools and there was no consensus as to what such courses should include or when and how they should be taught. Ten years after that survey, the survey results reported in this article found that the problems reported in the 1999 survey still exist. Additionally, there are still differences among schools offering English courses in terms of the timing and contents of the courses. Since teachers and school officials will have an important role in curriculum development, this article recommends that a fact-finding meeting with educators, school, and education officials be initiated to discuss, develop, and implement a core curriculum for these dental English courses.

  13. [The primary study of articulation effect on the adults with cleft palate undergoing palatopharyngoplasty

    PubMed

    Yang, Y; Yao, L H; Wang, G M; Yu, C Q

    1997-03-01

    A retrospective study was performed in 15 adults with cleft palate who operated with palato-pharyngoplasty.Using frequency spectrum analyser to describe their Chinese vowel frequency spectrum curve character.Their articulation effect after sugery was analyzed.The result shows:The excellent rate of the articulation on effect appears 46.67%.The author believes that:the palato-pharyngoplasty can be utilized as a manner to cure the adults with cleft palate and the advanced effect is needed to be continuously studied. PMID:15159955

  14. [Research and implement of the primary motion simulation based on virtual articulator].

    PubMed

    Dai, Ning; Zhou, Yongyao; Liao, Wenhe; Cheng, Xiaosheng; Yu, Qing

    2007-10-01

    This paper presents our work on the research process of virtual articulator simulation. Firstly, plaster models of upper jaw and low jaw are measured by 3D-optical measuring system and processed to get the available data. Secondly, complex physical modeling of the jaw motion is simplified and decomposed to a series of position transform, such as translation, rotation, etc.. Thirdly, opening/closing movement and laterotrusion is simulated by real-time updating display. Fourthly, the efficient collision detection algorithm is applied to dynamically compute occlusal contact regions and cutaway view. Finally, the current shortage of the virtual articulator simulation is discussed in detail and research prospect is forecasted.

  15. The history of articulators: the wonderful world of "grinders," Part 2.

    PubMed

    Starcke, Edgar N; Engelmeier, Robert L

    2012-04-01

    This is the second article in a three-part series on the history of denture grinding devices. The first article reviewed the earliest attempts to mechanically grind the occlusion of artificial teeth from the manipulation of simple articulators to very elaborate and complex machines powered by hand cranks. This article explores motor-driven grinders, most driven by way of a belt-driven pulley powered by an external source. A few were self-contained; that is, the motor was mounted on the grinder base. There were basically two types of grinders: those with cast holders for mounting processed dentures and those with provisions for using articulators for that purpose.

  16. Trends in Dentistry and Dental Education.

    ERIC Educational Resources Information Center

    Valachovic, Richard W.; Weaver, Richard G.; Sinkford, Jeanne C.; Haden, N. Karl

    2001-01-01

    Compiled from many of the surveys that the American Dental Education Association routinely publishes, along with data from surveys conducted by the American Dental Association and U.S. Department of Health and Human Services, presents statistical tables and descriptive text on trends among dental patients, among dental practitioners, and in dental…

  17. Dental Therapy Assistant: Effect on Team Productivity.

    ERIC Educational Resources Information Center

    Heid, Theodore H.

    The U.S. Army Dental Corps has implemented a formal program based on the concept that dental care can be more efficiently and effectively provided with treatment teams composed of one dental officer, two dental therapy assistants (DTAs), one basic assistant, and the shared support of other auxiliary personnel. Such a team will use three dental…

  18. Sources of Dental Health Teaching Aids.

    ERIC Educational Resources Information Center

    Crawford, Jean H.

    1982-01-01

    Sources of dental health education teaching aids which are available for free or at minimal cost include: (1) The American Dental Health Association; (2) state and local departments of public health; (3) schools of dentistry, dental hygiene, and dental assisting; and (4) the Educator's International Guide. (JN)

  19. 21 CFR 872.3240 - Dental bur.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Dental bur. 872.3240 Section 872.3240 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3240 Dental bur. (a) Identification. A dental bur is a...

  20. 21 CFR 872.3240 - Dental bur.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 8 2011-04-01 2011-04-01 false Dental bur. 872.3240 Section 872.3240 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3240 Dental bur. (a) Identification. A dental bur is a...

  1. 21 CFR 872.6390 - Dental floss.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Dental floss. 872.6390 Section 872.6390 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6390 Dental floss. (a) Identification. Dental floss is...

  2. 21 CFR 872.3700 - Dental mercury.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Dental mercury. 872.3700 Section 872.3700 Food and... DENTAL DEVICES Prosthetic Devices § 872.3700 Dental mercury. (a) Identification. Dental mercury is a device composed of mercury intended for use as a component of amalgam alloy in the restoration of...

  3. Developing core dental public health competencies for predoctoral dental and dental hygiene students.

    PubMed

    Mascarenhas, Ana Karina; Atchison, Kathryn Ann

    2015-01-01

    Dental professionals are an "underutilized" workforce, when it comes to advocating for prevention and wellness in populations. The goal of this HRSA-funded project is to develop dental public health (DPH) competencies and curriculum for US predoctoral dental and dental hygiene programs. These competencies and accompanying curriculum are designed to better prepare the oral health workforce to meet the needs of the entire population, including the chronically underserved, those challenged by poor health literacy, or communities encountering barriers to accessing oral health care. By increasing the DPH competency of all graduating dental providers, in population-based approaches to preventing oral diseases rather than the existing exclusive focus on treatment, the number of providers who can respond to a population or the public's unmet needs and challenges, both in private practices and publicly supported clinics, will increase. This paper describes the competency development process and the eight competencies that were identified. PMID:26630639

  4. Developing core dental public health competencies for predoctoral dental and dental hygiene students.

    PubMed

    Mascarenhas, Ana Karina; Atchison, Kathryn Ann

    2015-01-01

    Dental professionals are an "underutilized" workforce, when it comes to advocating for prevention and wellness in populations. The goal of this HRSA-funded project is to develop dental public health (DPH) competencies and curriculum for US predoctoral dental and dental hygiene programs. These competencies and accompanying curriculum are designed to better prepare the oral health workforce to meet the needs of the entire population, including the chronically underserved, those challenged by poor health literacy, or communities encountering barriers to accessing oral health care. By increasing the DPH competency of all graduating dental providers, in population-based approaches to preventing oral diseases rather than the existing exclusive focus on treatment, the number of providers who can respond to a population or the public's unmet needs and challenges, both in private practices and publicly supported clinics, will increase. This paper describes the competency development process and the eight competencies that were identified.

  5. Sugars and dental caries.

    PubMed

    Touger-Decker, Riva; van Loveren, Cor

    2003-10-01

    A dynamic relation exists between sugars and oral health. Diet affects the integrity of the teeth; quantity, pH, and composition of the saliva; and plaque pH. Sugars and other fermentable carbohydrates, after being hydrolyzed by salivary amylase, provide substrate for the actions of oral bacteria, which in turn lower plaque and salivary pH. The resultant action is the beginning of tooth demineralization. Consumed sugars are naturally occurring or are added. Many factors in addition to sugars affect the caries process, including the form of food or fluid, the duration of exposure, nutrient composition, sequence of eating, salivary flow, presence of buffers, and oral hygiene. Studies have confirmed the direct relation between intake of dietary sugars and dental caries across the life span. Since the introduction of fluoride, the incidence of caries worldwide has decreased, despite increases in sugars consumption. Other dietary factors (eg, the presence of buffers in dairy products; the use of sugarless chewing gum, particularly gum containing xylitol; and the consumption of sugars as part of meals rather than between meals) may reduce the risk of caries. The primary public health measures for reducing caries risk, from a nutrition perspective, are the consumption of a balanced diet and adherence to dietary guidelines and the dietary reference intakes; from a dental perspective, the primary public health measures are the use of topical fluorides and consumption of fluoridated water.

  6. [Dental anatomy of dogs].

    PubMed

    Sarkisian, E G

    2014-12-01

    The aim of the research was to investigate dog teeth anatomy as animal model for study of etiopathogenesis of caries disease and physiological tooth wear in human. After examining the dog's dental system, following conclusions were drawn: the dog has 42 permanent teeth, which are distributed over the dental arches not equally, and so the upper dentition consists of 20, and the lower of 22 teeth. The largest are considered upper fourth premolar and lower first molars, which are called discordant teeth. Between discordant teeth and fangs a dog has an open bite, which is limited to the top and bottom conical crown premolar teeth. Thus, in the closed position of the jaws, behind this occlusion is limited by discordant teeth, just in contact are smaller in size two molars. Only large dog's molars in a valid comparison can be likened to human molars, which allows us to use them in an analog comparison between them with further study of the morphological features ensure durability short-crown teeth and their predisposition to caries.

  7. Nanoindentation of dental composites.

    PubMed

    Drummond, James L

    2006-07-01

    The intent of this project was to evaluate the elastic modulus and hardness of four composites with different fillers, a microfill, a hybrid, a dental resin cement, and a fiber filler, using nanoindentation. An indentation load of 0.001 N was used and 100 indents per specimen were taken. The elastic modulus measured for the Choice composite was 30.2-30.3 GPa, 15.9-16.0 GPa for Micronew, 24.6-27.1 GPa for Renew, and 36.4-47.1 GPa for Restolux. The statistical analysis indicated a significant difference in the elastic modulus for all four composites. Micronew had the lowest hardness (1.2-1.3 GPa) followed by Renew (1.6-1.8 GPa), Choice (2.6-2.8 GPa), and Restolux (2.7-4.0 GPa). The statistical analysis indicated a significant difference between Choice and Restolux from Micronew and Renew, with Renew and Micronew not being significantly different from each other. Nanoindentation of dental composites, using a 10 x 10 matrix of indentations, resulted in a wide range of measured values for the elastic modulus and hardness because of the size of the filler particle, the location of the indenter within the filler particle, the composition of the filler particles, and the location of the indenter within the filler/resin matrix.

  8. Nanotechnology and dental implants.

    PubMed

    Lavenus, Sandrine; Louarn, Guy; Layrolle, Pierre

    2010-01-01

    The long-term clinical success of dental implants is related to their early osseointegration. This paper reviews the different steps of the interactions between biological fluids, cells, tissues, and surfaces of implants. Immediately following implantation, implants are in contact with proteins and platelets from blood. The differentiation of mesenchymal stem cells will then condition the peri-implant tissue healing. Direct bone-to-implant contact is desired for a biomechanical anchoring of implants to bone rather than fibrous tissue encapsulation. Surfaces properties such as chemistry and roughness play a determinant role in these biological interactions. Physicochemical features in the nanometer range may ultimately control the adsorption of proteins as well as the adhesion and differentiation of cells. Nanotechnologies are increasingly used for surface modifications of dental implants. Another approach to enhance osseointegration is the application of thin calcium phosphate (CaP) coatings. Bioactive CaP nanocrystals deposited on titanium implants are resorbable and stimulate bone apposition and healing. Future nanometer-controlled surfaces may ultimately direct the nature of peri-implant tissues and improve their clinical success rate.

  9. Nanotechnology and Dental Implants

    PubMed Central

    Lavenus, Sandrine; Louarn, Guy; Layrolle, Pierre

    2010-01-01

    The long-term clinical success of dental implants is related to their early osseointegration. This paper reviews the different steps of the interactions between biological fluids, cells, tissues, and surfaces of implants. Immediately following implantation, implants are in contact with proteins and platelets from blood. The differentiation of mesenchymal stem cells will then condition the peri-implant tissue healing. Direct bone-to-implant contact is desired for a biomechanical anchoring of implants to bone rather than fibrous tissue encapsulation. Surfaces properties such as chemistry and roughness play a determinant role in these biological interactions. Physicochemical features in the nanometer range may ultimately control the adsorption of proteins as well as the adhesion and differentiation of cells. Nanotechnologies are increasingly used for surface modifications of dental implants. Another approach to enhance osseointegration is the application of thin calcium phosphate (CaP) coatings. Bioactive CaP nanocrystals deposited on titanium implants are resorbable and stimulate bone apposition and healing. Future nanometer-controlled surfaces may ultimately direct the nature of peri-implant tissues and improve their clinical success rate. PMID:21253543

  10. Sensitivity of spectral moments to Swedish dental versus American English alveolar word-initial /t/ bursts

    NASA Astrophysics Data System (ADS)

    Buder, Eugene H.; Parham, Douglas F.; Stoel-Gammon, Carol

    2003-04-01

    Previous investigations comparing Swedish dental versus American English alveolar /t/ production found many acoustic differences in both adults and 30-month-old children [C. Stoel-Gammon, K. Williams, and E. H. Buder, ``Cross-language differences in phonological acquisition: Swedish and American /t/,'' Phonetica 51, 146-158 (1994)]. The primary differences in the word initial consonants included the second spectral moment (``spectral SD''), VOT, and burst intensity. However, subsequent studies demonstrated that spectral SD and other moments measures were sensitive to recording environment and correlated with other production characteristics. Moreover, measurements of spectral SD differed across these languages in other stop bursts such as /p/ and /k/. These observations raised questions regarding the true sensitivity of this measure in place of articulation for /t/. To examine these questions, the current work examines stop burst characteristics of two adult male native speakers of Swedish and American English recorded in an anechoic chamber with digital equipment. Results suggest that the primary variation of spectral SD in /t/ bursts is attributable to the dental versus the alveolar place of articulation. However, the results indicate that spectral moment measures are also generally sensitive to burst intensity, which may be unrelated to place but still language-specific. [Work supported by NICHD R01-HD32065.

  11. Initial dental needs and a projection of needed dental capacity in the Iowa Department of Corrections.

    PubMed

    Ringgenberg, Wendy J

    2011-04-01

    The dental health data for the Iowa Department of Corrections (IDOC) inmate population were analyzed to better understand dental health issues experienced by inmates and IDOC's system for responding to those dental needs. Each inmate is given a dental health assessment upon admission to Iowa's prison system. These data were analyzed for frequency of dental health needs and frequency of dental health services. In addition, emergency dental health services were analyzed. The findings show that each inmate has approximately 7.6 dental codes, including the initial exam, dental services provided, and dental needs not yet addressed. When reviewing only dental needs (and not the initial exam), 32% (5,110) identified dental needs were completed and 66% (10,572) were not.

  12. Roughness Measurement of Dental Materials

    NASA Astrophysics Data System (ADS)

    Shulev, Assen; Roussev, Ilia; Karpuzov, Simeon; Stoilov, Georgi; Ignatova, Detelina; See, Constantin von; Mitov, Gergo

    2016-06-01

    This paper presents a roughness measurement of zirconia ceramics, widely used for dental applications. Surface roughness variations caused by the most commonly used dental instruments for intraoral grinding and polishing are estimated. The applied technique is simple and utilizes the speckle properties of the scattered laser light. It could be easily implemented even in dental clinic environment. The main criteria for roughness estimation is the average speckle size, which varies with the roughness of zirconia. The algorithm used for the speckle size estimation is based on the normalized autocorrelation approach.

  13. Head and neck cancer, dental implants, and dental oncology.

    PubMed

    Garg, Arun; Guez, Ghislaine

    2011-01-01

    Head and neck cancer is a real presence in the dental-implant world--patients who undergo surgery, chemotherapy, and/or radiation often seek the assistance of dental-implant practitioners to restore them to better function; other patients who have had implants in place for years will return with questions regarding how their treatment will be affected by the presence of their dental implant. As oral-cancer treatment modalities are rapidly changing, practitioners struggle to keep up with the literature surrounding this important subset of the dental-implant population. This month, we look at the numbers of patients suffering from oral cancers, consider the different treatment options for patients with oral cancers, and investigate the role that implants play in improving therapeutic outcomes or changing treatment course.

  14. Increasing dental student diversity through the UNLV Dental Prospects Program.

    PubMed

    McClain, Mildred A; Jones, Francis R; McClain, Clifford R; Curd, Francis M

    2013-05-01

    Adequately providing for the health care of the growing minority population in the United States requires increased racial and ethnic diversity of the health care workforce. Long-term diversity in the dental profession depends on a more diverse student population in dental schools. The University of Nevada, Las Vegas School of Dental Medicine's (UNLV SDM) Dental Prospects Club is a predental education program that has increased the number of underrepresented minority and disadvantaged students in the school by concentrating on outreach, recruitment, and retention initiatives. The approaches used by the club members and faculty advisors to increase the number of underrepresented minority students recruited to and enrolled in the UNLV SDM are discussed in this report. Also described are the strategies, methods, internal infrastructure, and organizational support used to increase the number of underrepresented minority students at the school.

  15. The Effect of Otitis Media on Articulation in Children with Cerebral Palsy.

    ERIC Educational Resources Information Center

    Van der Vyver, Marguerite; And Others

    1988-01-01

    A study involving 20 Afrikaans-speaking children with cerebral palsy found that recurrent otitis media in early childhood had a negative effect on articulation abilities of the 7 to 11-year-old children but that other factors such as intelligence also played a role. (JDD)

  16. Dreams Worth Pursuing: How College Students Develop and Articulate Their Purpose in Life

    ERIC Educational Resources Information Center

    Schluckebier, Michael Edward

    2013-01-01

    The purpose of this study was to describe the experiences undergraduate students cite as helping them develop and articulate their purpose in life. Purpose in life, as a construct, is associated with many positive attributes associated with life in general, and the college experience specifically; however, it is also closely related to other…

  17. Interinstitutional Collaboration Practices between Virginia Community Colleges and High Schools Involved in Dual Enrollment Articulation Agreements

    ERIC Educational Resources Information Center

    Caradona, Sally Lynn

    2012-01-01

    The purpose of this study was to build on the previous work of articulation practices of Virginia's public school divisions and community colleges participating in dual enrollment partnerships, and to understand the role of the community college in initiating, developing, and implementing dual enrollment programs. The primary focus involved…

  18. Articulated Curriculum for Agricultural Occupations. 2 + 2. Second Year Final Report.

    ERIC Educational Resources Information Center

    Daingerfield-Lone Star Independent School District, Daingerfield, TX.

    The Agriculture 2+2 Curriculum Development Project was an articulated training program linking the last 2 years of secondary and the first 2 years of postsecondary training designed to prepare students for employment in 3 or more agricultural technology occupations. The curriculum provided for the development of saleable skills after grade 12 and…

  19. Competencies Needed for Articulation among and between Post-Secondary Vocational Food Technology Programs in Texas.

    ERIC Educational Resources Information Center

    Glosson, Linda R.; Schrock, Jay R.

    A study examined the competencies needed for articulation among and between postsecondary vocational food technology programs in Texas. A two-round Delphi survey was used to collect data from the instructors and coordinators of food service programs in Texas postsecondary institutions during the 1984-85 school year. Thirty-five of the 71 persons…

  20. Learning Together? Experiences on a China-U.K. Articulation Program in Engineering

    ERIC Educational Resources Information Center

    Hou, Junxia; McDowell, Liz

    2014-01-01

    This article reports some of the findings of a longitudinal ethnographic research study on the intercultural transition experiences of 50 engineering students in a China-U.K. articulation program. It focuses on the interaction between these students and the U.K.-based cohort, mainly home students. The findings indicate that lack of suitable…

  1. Cognitive Levels Regarding Articulation Marks among Violin Students in Department of Music Education in Gazi University

    ERIC Educational Resources Information Center

    Taninmis, Gamze Elif

    2016-01-01

    The purpose of this study is to determine violin students' cognitive levels about articulation marks in Department of Music Education, Fine Arts Education, Gazi Faculty of Education, Gazi University (GUGEF), and to identify the variables on which the cognitive levels vary. It is a descriptive research considering the study purpose, method and…

  2. Allied Health Education/Transfer of Credit: Recommendations of the North Carolina Articulation Project.

    ERIC Educational Resources Information Center

    Boatman, Ralph H., Ed.; Huther, John W., Ed.

    The North Carolina Allied Health Articulation Project was launched to develop procedures which would enable an individual to transfer credit from an allied health education program in one setting to some program in higher education. In 1972-73, study committees were appointed to deal with the allied health professions of physical therapy,…

  3. The Negotiation and Articulation of Identity, Position and Ethos in Joint Church Academies

    ERIC Educational Resources Information Center

    Green, Elizabeth

    2014-01-01

    This paper summarises the key findings of a research project into the identity, position and ethos of jointly sponsored church academies. The research sought to investigate how joint church academies are situated within the field, how they relate to existing academies and the maintained church school sector and how they articulate their vision and…

  4. Gender Equality in Media Content and Operations: Articulating Academic Studies and Policy--A Presentation

    ERIC Educational Resources Information Center

    Lourenço, Mirta Edith

    2016-01-01

    In this article, Mirta Lourenço explains the prospects when higher education studies interface with UNESCO for policy change. The baseline is that education institutions' articulation with media organizations, media professionals, policy-makers, and civil society groups is essential to achieve gender equality in and through media.

  5. Improving Articulation and Transfer Relationships. New Directions for Community Colleges, Number 39.

    ERIC Educational Resources Information Center

    Kintzer, Frederick C., Ed.

    1982-01-01

    With the intent of revitalizing the study of educational articulation and transfer, this collection of essays describes and assesses the current status of transfer education, points to particular problems and concerns, and highlights specific techniques, activities, and practices. The volume includes "The Transfer Function--One of Many," by…

  6. Lubrication Specialist: Task List and Competency Record. Developed for Vocational-Technical Curriculum Articulation in Minnesota.

    ERIC Educational Resources Information Center

    Minnesota State Dept. of Education, St. Paul. Div. of Vocational and Technical Education.

    Intended for the vocational instructor, the booklet presents a task list and competency record for the occupational program of lubrication specialist. The list was developed by a working committee of auto mechanics instructors and industry representatives throughout the state of Minnesota for use in program articulation between secondary and…

  7. Misspoken in Arizona: Latina/o Students Document the Articulations of Racism

    ERIC Educational Resources Information Center

    Cammarota, Julio

    2014-01-01

    This article reports on racism expressed by school personnel (administrators and teachers) and experienced by Latina/o students at a high school located in Tucson, Arizona. Students in a specialized social science research program, called the Social Justice Education Project (SJEP), documented personal encounters with racist articulations at their…

  8. Being Nature: Interspecies Articulation as a Species-Specific Practice of Relating to Environment

    ERIC Educational Resources Information Center

    Rautio, Pauliina

    2013-01-01

    Rather than categorically teaching us ways to be less anthropocentric, environmental education could be about educating us of the ways in which we already are nature as human animals. In this paper, one species-specific practice of human relating to environment--interspecies articulation--is argued as one way of being nature. Interspecies…

  9. The IPA Categories "Pharyngeal" and "Epiglottal": Laryngoscopic Observations of Pharyngeal Articulations and Larynx Height.

    ERIC Educational Resources Information Center

    Esling, John H.

    1999-01-01

    Reexamines the sounds produced at the pharyngeal place of articulation to review the linguistic phonetic realizations of sounds that have been labeled "pharyngeal" and those that have been labeled "epiglottal," and to investigate the production of a series of pharyngeal sounds under conditions of larynx raising and larynx lowering. (Author/VWL)

  10. Articulated, Performance-Based Instruction Guide for Drafting II. Final Document. Revised.

    ERIC Educational Resources Information Center

    Henderson, William Edward, Jr.

    Developed during a project designed to provide continuous, performance-based vocational training at the secondary and postsecondary levels, this instructional guide is intended to help teachers implement a laterally and vertically articulated secondary level drafting II program. Introductory materials include a description of Drafting II,…

  11. PAATCH: Program of Auditory Articulation Therapy for Children. Expanded Version. New Carryover Home Activities.

    ERIC Educational Resources Information Center

    Hill, Diane Pagnotto

    This program of auditory articulation therapy de-emphasizes production-oriented therapy in working with unintelligible 3-to-6-year-old children. It proposes auditory training activities, which train the child's ears on all sounds in error in order to facilitate readiness for correct production of sounds. Production training is then suggested for…

  12. Articulated Multimedia Physics, Lesson 6, Uniformly Accelerated Motion of Bodies Starting From Rest.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the sixth lesson of the Articulated Multimedia Physics Course, instructional materials are presented in this study guide with relation to the uniformly accelerated motion of bodies starting from rest. The objective is to teach students how a complete set of equations of motion is derived and how to use them. Free falling bodies near the Earth's…

  13. A Flexible Approach to Learning: Articulating Courses. Mendip Papers MP 058.

    ERIC Educational Resources Information Center

    McLachlan, J. E.; Wood, Vivienne

    Students and the institution have benefited through the installation of a flexible approach to learning that focuses on a portfolio of articulating courses in the accounting area of the Business School at Napier University, Edinburgh, Scotland. A suite of courses offers students with different abilities and resources a number of options that lead…

  14. Articulating Secondary and Post-Secondary Vocational Education Curricula. Final Report.

    ERIC Educational Resources Information Center

    Farning, Max; And Others

    A study was conducted to develop a procedure by which secondary and postsecondary articulation could be improved in a selected trade and industrial program (welding). Thirteen high school teachers were surveyed using a list of 560 tasks to determine what high school programs they were teaching. Results of this survey were used to develop a…

  15. Articulation to and from the Applied Associate Degree: Challenges and Opportunities

    ERIC Educational Resources Information Center

    Ignash, Jan M.

    2012-01-01

    This chapter discusses the "tangled knot" of articulating associate degrees in applied fields and reviews sample programs from applied associate (A.A.S.) to baccalaureate degrees using three distinct pathways, comparing the resulting A.A.S. to baccalaureate degree pathways to similar B.A. or B.S. programs. It focuses predominantly on curricular…

  16. Encouraging Student Reflection and Articulation Using a Learning Companion: A Commentary

    ERIC Educational Resources Information Center

    Goodman, Bradley; Linton, Frank; Gaimari, Robert

    2016-01-01

    Our 1998 paper "Encouraging Student Reflection and Articulation using a Learning Companion" (Goodman et al. 1998) was a stepping stone in the progression of learning companions for intelligent tutoring systems (ITS). A simulated learning companion, acting as a peer in an intelligent tutoring environment ensures the availability of a…

  17. Articulation Rate and Vowel Space Characteristics of Young Males with Fragile X Syndrome: Preliminary Acoustic Findings

    ERIC Educational Resources Information Center

    Zajac, David J.; Roberts, Joanne E.; Hennon, Elizabeth A.; Harris, Adrianne A.; Barnes, Elizabeth F.; Misenheimer, Jan

    2006-01-01

    Purpose: Increased speaking rate is a commonly reported perceptual characteristic among males with fragile X syndrome (FXS). The objective of this preliminary study was to determine articulation rate--one component of perceived speaking rate--and vowel space characteristics of young males with FXS. Method: Young males with FXS (n = 38), …

  18. Transfer and Articulation Issues between California Community Colleges and California State University

    ERIC Educational Resources Information Center

    Tucker, Linda

    2013-01-01

    Purpose: The primary purpose of this study was to discover common transfer and articulation practices and to determine what practices aid in the implementation of the STAR Act between California Community Colleges and the California State University. The review of literature revealed a lack of research on the application of practices in transfer…

  19. Implementing Transfer and Articulation: A Case Study of Community Colleges and State Universities

    ERIC Educational Resources Information Center

    Senie, Kathryn C.

    2016-01-01

    This study examined the cultural aspects of a transfer articulation policy between public community colleges and state universities enacted by a newly consolidated state governing board for higher education in a northeastern state. A qualitative multisite case study design explored how key stakeholders, faculty, administrators and staff viewed the…

  20. Articulation of Industrial R&D with Higher Education in the Telecommunications Sector in South Africa

    ERIC Educational Resources Information Center

    Paterson, Andrew

    2005-01-01

    This article shows how and why particular higher education?industry research and development networks articulate with the South African telecommunications sector. The range of competing and complementary data telecommunications technologies available in the South African market provide varying opportunities for enterprises to engage in R&D. Two…

  1. The Impact of Dual and Articulated Credit on College Readiness and Retention in Four Community Colleges

    ERIC Educational Resources Information Center

    Kim, JoHyun; Bragg, Debra D.

    2008-01-01

    Using Astin's I-E-O model, relationships among the input (I) variables of gender, high school percentile rank, Tech Prep participation, and high school course-taking; environmental (E) variables of academic, career and technical education (CTE), and total dual credit and articulated credit; and output (O) variables of college readiness and total…

  2. Improving Access to the Baccalaureate: Articulation Agreements and the National Science Foundation's Advanced Technological Education Program

    ERIC Educational Resources Information Center

    Zinser, Richard W.; Hanssen, Carl E.

    2006-01-01

    This article presents an analysis of national data from the Advanced Technological Education (ATE) program regarding articulation agreements for the transfer of 2-year technical degrees to baccalaureate degrees. Quantitative and qualitative data are illustrated to help explain the extent to which ATE projects improve access to universities for…

  3. Feasibility of an LPN to ADN Articulation Program at LSUA. Vocational Education Research.

    ERIC Educational Resources Information Center

    Louisiana State Univ., Alexandria.

    A feasibility study examined the need for and likelihood of success for a Licensed Practical Nurse (LPN) to Associate Degree in Nursing (ADN) articulation program for Louisiana State University (LSU) at Alexandria. Following a literature search on the theoretical establishment and implementation of such a program, three schools with successful…

  4. The Angle of Articulation in Textual Movement. Cognitive Science Research No. 60.

    ERIC Educational Resources Information Center

    Bierschenk, Bernhard

    Natural systems are self-organizing and stratify according to the angular articulation of their movements. In particular, movement is relative to the levels that define its behavior space. As natural phenomenon, text production is self-referential, In generating information, the intention of the producer of a text becomes specified. Specifying of…

  5. Disorders of Articulation. Prentice-Hall Foundations of Speech Pathology Series.

    ERIC Educational Resources Information Center

    Carrell, James A.

    Designed for students of speech pathology and audiology and for practicing clinicians, the text considers the nature of the articulation process, criteria for diagnosis, and classification and etiology of disorders. Also discussed are phonetic characteristics, including phonemic errors and configurational and contextual defects; and functional…

  6. Effects of Abnormal Oral Reflexes on Speech Articulation in Persian Speaking Children with Spastic Cerebral Palsy

    PubMed Central

    DADGAR, Hooshang; HADIAN, Mohammad Reza; LIRA, Ortega Adriana

    2016-01-01

    Objective The purpose of this study was to investigate the relationship between the presence of abnormal oral reflexes and speech sound production in children with severe cerebral palsy. Materials & Methods Seven oral reflexes such as, rooting, mouth-opening, biting, chewing, lip, tongue, and suckling were examined in 52Persian-speaking monolingual children with spastic cerebral palsy (ages 5-10 yr).Phonetic information tests were administered to investigate their ability for articulation of the speech sounds. Results A significant relationship between three (i.e. the chewing, lip, and biting reflexes) out of the seven abnormal oral reflexes and the speech articulation was noticed. The presence of the chewing reflex was associated with deficits in production of /s, z, š,č/ sounds. The lip reflex was associated with deficits in the production of /p, m, r, j, f, č/ sounds. The biting reflex was associated with deficits in the production of /z, l, y and š/ sounds. No significant relationship was found between the rooting, mouth-opening, tongue, and suckling reflexes and sound articulation. Conclusion The presence of abnormal reflexes in the children with spastic cerebral palsy would suggest a correlation between these reflexes and sound articulation in Iranian children with spastic cerebral palsy. Hence, these observations might suggest some disturbances in normal speech development. PMID:27375753

  7. The difference practice makes: Evidence, articulation, and affect in HIV prevention.

    PubMed

    Race, Kane

    2014-06-01

    This paper considers the difference that a conception of sex as social practice has made to the relations articulated in HIV social research in Australia. In defining sexual practice as "fluid, embedded in specific social formations, and involving the negotiation of meaning" (Kippax & Stephenson, 2005), social researchers put their own research categories and questions at risk by constructing situations in which the objects of research were given occasions to counter researchers' presumptions through the use of their own categories. Taking this risk produced sharp insights about the evolving dynamics of gay sexuality in this context and produced distinctive, interesting findings. It enabled the articulation of the practice of negotiated safety and later strategies of HIV risk reduction emerging from gay men's practice, for example. I draw on Latour's (2004) concept of articulation to make sense of these innovations and cut through some of the key distinctions that organize HIV research: qualitative/quantitative; social/biomedical; subject/ object; human/nonhuman; interpretations/evidence. Rather than rest on the organizing power of these distinctions, keeping HIV prevention effective, engaging and interesting will require specific attention to the embodied articulation of HIV relations in the present.

  8. The Acoustic Properties of Vowels: A Tool for Improving Articulation and Comprehension of English

    ERIC Educational Resources Information Center

    McCombs, Candalene J.

    2006-01-01

    Correct pronunciation is often a later step in the process of teaching English as a second language. However, a focus on the correct articulation of vowels can significantly improve listening and comprehension skills as well as articulatory skills. Vowels and consonants differ in their acoustic properties. Unlike consonants, vowel sounds are…

  9. Is Tongue Strength an Important Influence on Rate of Articulation in Diadochokinetic and Reading Tasks?

    ERIC Educational Resources Information Center

    Neel, Amy T.; Palmer, Phyllis M.

    2012-01-01

    Purpose: The purpose of this study was to assess the relationship between tongue strength and rate of articulation in 2 speech tasks, diadochokinetic rates and reading aloud, in healthy men and women between 20 and 78 years of age. Method: Diadochokinetic rates were measured for the syllables /p[wedge]/, /t[wedge]/, /k[wedge]/, and…

  10. Advancing Articulation: Models of College-University Collaboration in Canadian Higher

    ERIC Educational Resources Information Center

    Kirby, Dale

    2008-01-01

    This paper reports on the results of an analysis of program articulation between the college and university sectors in Canada. The Canadian post-secondary system is best described as a binary system with discrete university and non-university sectors. While there are complex sectoral differences between the two institutional types in terms of…

  11. 2+2 Statewide Articulation Policy, Student Persistence, and Success in Florida Universities

    ERIC Educational Resources Information Center

    Garcia Falconetti, Angela M.

    2009-01-01

    The reported study in this paper examined the continuing viability of Florida's 2+2 articulation agreement by comparing academic success and persistence among Florida public community college graduates (n = 1,738) and native (n = 874) juniors at three universities. Discriminant analysis yielded statistically significant differences. Transfer…

  12. Jazz Style and Articulation: How to Get Your Band or Choir to Swing

    ERIC Educational Resources Information Center

    Tolson, Jerry

    2012-01-01

    The interpretation of jazz style is crucial to the element of swing in any jazz ensemble performance. Today, many charts for both large and small instrumental and vocal jazz ensembles are well marked with articulations and expression markings. However, in some cases, there is nothing to guide the musician. This article addresses some common jazz…

  13. Face bow and articulator for planning orthognathic surgery: 1 face bow.

    PubMed

    Walker, Fraser; Ayoub, Ashraf F; Moos, Khursheed F; Barbenel, Joseph

    2008-10-01

    Orthognathic surgery that involves movement of the maxilla relative to the skull is usually planned using casts mounted on an articulator. Accurate positioning of the maxilla relative to the skull is essential for reliable planning, but current methods of mounting casts on articulators are inaccurate and unreliable. We propose that the casts should be mounted using the relation between the horizontal plane and the resting head position to define the position of the skull. A photographic study of 10 subjects confirmed the reproducibility of the head position and its relation to the horizontal plane. A face bow incorporating a circular spirit level was used to transfer the relation between the horizontal and the maxillary dentition to a semiadjustable articulator. The angle between the horizontal and maxillary occlusal planes was measured from six lateral cephalograms and compared with those of casts mounted on a semiadjustable articulator using a face bow with either an orbital pointer or a spirit level. The face bow with a spirit level produced considerably more accurate results.

  14. The Somatotopy of Speech: Phonation and Articulation in the Human Motor Cortex

    ERIC Educational Resources Information Center

    Brown, Steven; Laird, Angela R.; Pfordresher, Peter Q.; Thelen, Sarah M.; Turkeltaub, Peter; Liotti, Mario

    2009-01-01

    A sizable literature on the neuroimaging of speech production has reliably shown activations in the orofacial region of the primary motor cortex. These activations have invariably been interpreted as reflecting "mouth" functioning and thus articulation. We used functional magnetic resonance imaging to compare an overt speech task with tongue…

  15. Articulated Multimedia Physics, MBO List. Measurable Behavioral Objectives, Lessons 1 through 14.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    A list of measurable behavioral objectives (MBO) is presented in this booklet for use throughout the Articulated Multimedia Physics Course. The objectives are divided into terminal and enabling objectives. Computer analyses of student's achievement are given in the form of the MBO number. The objectives are grouped into 14 lessons: measurement and…

  16. Articulated Multimedia Physics, Lesson 14, Gases, The Gas Laws, and Absolute Temperature.

    ERIC Educational Resources Information Center

    New York Inst. of Tech., Old Westbury.

    As the fourteenth lesson of the Articulated Multimedia Physics Course, instructional materials are presented in this study guide with relation to gases, gas laws, and absolute temperature. The topics are concerned with the kinetic theory of gases, thermometric scales, Charles' law, ideal gases, Boyle's law, absolute zero, and gas pressures. The…

  17. Transfer and Articulation in the 1990s: California in the Larger Picture.

    ERIC Educational Resources Information Center

    California State Postsecondary Education Commission, Sacramento.

    This report puts California's current efforts to find solutions to its problems of transfer and articulation in the broader context of national concerns. Following a brief summary and overview, part 1 sets forth a seris of conclusions and six recommendations for action by the University of California, the California State University, the…

  18. Enhancing Articulation and Transfer. New Directions for Community Colleges, Number 61.

    ERIC Educational Resources Information Center

    Prager, Carolyn, Ed.

    1988-01-01

    This collection of essays offers a variety of perspectives on academic and procedural aspects of transfer and articulation activities. The volume includes articles on state, regional, and foundation-sponsored efforts to improve transfer processes, as well as essays concerned with programs to create vehicles and channels for interinstitutional…

  19. Articulated, Performance-Based Instruction Objectives Guide for Automotive Mechanics. Final Document. Revised.

    ERIC Educational Resources Information Center

    Henderson, William Edward, Jr.

    Developed during a project designed to provide continuous, performance-based vocational training at the secondary and postsecondary levels, this instructional guide is intended to help teachers implement a laterally and vertically articulated secondary level automotive mechanics program. Introductory materials include descriptions of Automotive…

  20. Automotive Mechanic: Task List and Competency Record. Developed for Vocational-Technical Curriculum Articulation in Minnesota.

    ERIC Educational Resources Information Center

    Minnesota State Dept. of Education, St. Paul. Div. of Vocational and Technical Education.

    Intended for the vocational instructor, the booklet presents a task list and competency record for the occupational program of automotive mechanic. The list was developed by a working committee of auto mechanics instructors and industry representatives throughout the state of Minnesota for use in program articulation between secondary and…