Treating the patient with Down syndrome.
Explore the source record for details and available documents.
Adult↗
Biomedical subjects
E S Pilcher
Publications and source records attributed to E S Pilcher.
Students' evaluation of online course materials in fixed prosthodontics: a case study.
PURPOSE: The purpose of this study was to assess a new online course format for dental students. Preclinical Fixed Prosthodontics I is a didactic and laboratory course given in the first year of the dental school curriculum. In the spring semester of 1999, the didactic portion of the course was offered in a web-based format as a supplement to the traditional lecture format. METHODS: The study population was 53 first year dental students at one school. The study design was a one group post test without a control group. The online questionnaire consisted of multiple choice questions, Leikert scale questions and open-ended questions. Data were collected using Filemaker Pro and analyzed using Epilnfo. RESULTS: Student response rate was 96% (52/53). All of the students responded that they felt comfortable with their computer skills in utilizing this course format. Most (96%) responded that the online materials were either very helpful or helpful to them. About half, (54%) recommended that the online format be continued as a supplement to traditional lectures, while 28% recommended replacing traditional lectures with the new format in order to provide more laboratory time in the course. The syllabus, lecture materials, bulletin board and handouts were found to be the most helpful online features. The least helpful features were the listserve, decision tree, and e-mail options. Most frequently mentioned strengths of the online material were listed as 1) the ability to view material at their own pace and at a time convenient to them, 2) quality photographs in lecture materials and 3) online quizzes. Weaknesses of the course were ranked by students as 1) problems with access to the materials and the intranet system, 2) taking quizzes online and 3) difficulty in printing the web-based lecture materials. CONCLUSIONS: The delivery of web-based material as a course supplement in Fixed Prosthodontics I was determined to be an overall success. Fine tuning of problems with access to the materials took place throughout the course. The student feedback will help direct future development of web-based course materials in the dental school curriculum.
Adult↗
Comparison of cutting rates among single-patient-use and multiple-patient-use diamond burs.
PURPOSE: The purpose of this study was to compare the volumetric cutting rates of 6 cylindrical-shaped single-patient-use and 2 cylindrical-shaped multiple-patient-use diamond burs using a machinable ceramic material. The degree of wear among burs from each type was also compared using scanning electron microscopy. MATERIALS AND METHODS: Six types of single-patient-use diamond burs and 2 types of multiple-patient-use diamond burs with similar cylindrical shape and dimensions were selected. Five burs of each type were evaluated using a high-speed handpiece mounted on a custom testing device. Using a 6-mm cutting length of each bur, 20 cuts, each 12.2-mm long, were made at exactly one half the diameter of the bur. Mean volumetric cutting rate through the ceramic substrate for Cuts 1 through 20 was calculated for each bur type in cubic millimeters prepared per second. A repeated measures analysis of variance (alpha = 0.05) and post hoc one-way analysis of variance with Scheffé's test was used to compare cutting rates among bur types for Cuts 2, 10, and 20. The topography of one bur from each group was evaluated with scanning electron microscopy after Cut 2 and again after Cut 20. RESULTS: For Cut 2, the mean cutting rates ranged from 3.3 to 5.3 mm3/s. The mean cutting rates for all bur types decreased approximately 20% by Cut 20. Bur type and length of use significantly influenced cutting rate (p < .002). However, only one type of single-patient-use diamond bur had a significantly lower mean cutting rate after Cut 2, 10, and 20, compared with other single- and multiple-patient-use diamond burs. Scanning electron microscopy showed all burs exhibited wear of diamond particles, as well as loss of diamond particles and binder. CONCLUSIONS: Five of six single-patient-use diamond burs had mean volumetric cutting rates through a ceramic that were similar to 2 multiple-patient-use diamonds for as many as 20 cuts. The gradual reduction in cutting rate during the 20 cuts for all bur types was a result of bur wear.
Analysis of Variance↗
Marginal fit of electroformed ceramometal crowns.
PURPOSE: A method of fabricating ceramometal crowns using gold copings produced by an electroforming process has been described, which purportedly results in restorations exhibiting an excellent marginal fit. This study compares the fit of electroformed ceramometal crowns with ceramometal crowns fabricated using conventional lost wax casting techniques. MATERIALS AND METHODS: Electroformed and conventional ceramometal crowns were fabricated for prepared extracted teeth. Specimens were cemented, embedded in acrylic resin, sectioned, polished, photographed, and measured to compare marginal fit. RESULTS: Marginal fit of electroformed ceramometal crowns was superior to the fit of ceramometal crowns fabricated using conventional casting techniques. The difference was statistically significant at a P = .05 level. CONCLUSIONS: Crowns utilizing copings fabricated by electroforming methods appear to have a fit superior to conventional ceramometal crowns fabricated using copings made by lost wax casting. The ease in laboratory electroforming techniques and the esthetic advantages of a gold-colored coping can be capitalized on without concerns of a poorer fit.
Crowns↗
Evaluation of polycaprolaitone custom tray material.
Custom impression trays are necessary for accurate impressions in fixed prosthodontics when using polysulfide impression materials. These custom impression trays are needed to provide for a uniform thickness of impression material to minimize distortion. Custom impression trays have historically been made from acrylic resin. New materials have been developed as alternatives to acrylic resin, and this study evaluates one product currently available that is composed of polycaprolaitone. This study evaluates the modulus of elasticity of polycaprolaitone as compared with acrylic resin, and also evaluates the amount of permanent deformation of the new material when placed under a load. The elastic modulus of polycaprolaitone was tested using three-point bending of specimens placed in a universal mechanical test system. The elastic modulus of the new material was found to be significantly lower than that of acrylic resin. The next test evaluated the amount of permanent deformation of the polycaprolatione material when specimens approximating the shape and size of custom impression trays were placed under a load. These trays were placed in a universal mechanical test system and differing loads were placed on them. Results showed that although the trays deformed at relatively low loads, all deformation was fully recovered within a clinically insignificant period of time (less than 30 seconds). From these experiments it was concluded that although the polycaprolaitone material has a lower modulus of elasticity and will deform under relatively low loads, the material recovers completely, and thus the deformation would not interfere with the clinical performance of polycaprolaitone as a custom tray material.
Dental Impression Technique↗
Open proximal contact associated with a cast restoration--progressive bone loss: a case report.
A patient presented with early to moderate periodontitis localized around tooth No. 30. This tooth had a cast restoration with an open proximal contact for the previous seven years. Radiographs spanning this time period showed progressive bone loss. Surgical periodontal therapy was performed after correction of the open proximal contact with a provisional restoration. A new porcelain-fused-to-metal crown was placed three months after surgical therapy. The patients has been on a regular six-month recall schedule for three years and has maintained a healthy periodontium. Prior food impaction has been eliminated and the patient is without complaints.
Adult↗