A research report submitted for partial completion of Masters in Dentistry in Prosthodontics / Purpose: The purpose of this study was to measure and compare the influence of abutment teeth guide planes and partial denture guiding surfaces on the retention of removable partial dentures. Method: An upper typodont model was modified by removing both second premolars and first molars, thus creating two bounded saddles. An impression of the model was made with irreversible hydrocolloid and a cast poured, on which an acrylic resin based removable partial denture (RPD) was made. To this denture a hooking device was added so that the model and denture could be placed on a custom-made platform and jig on a universal testing machine (Instron, UK). The RPD was then removed from the model along its path of insertion (perpendicular to the occlusal plane) as well as at 2° and 5° and the maximum load recorded. The typodont model was then modified by making guide planes on the abutment teeth, and a second RPD made and the procedure repeated. This RPD was then modified by creating guiding surfaces directly against the guide planes using autopolymerising resin, and the procedure again repeated. Each measurement was made 10 times at each path of insertion/withdrawal, resulting in 90 measurements. Results There were some differences between the different paths of withdrawal in each of the three situations, explicable by the lack of ideal contact in the first two dentures, and the much improved contact in the third, which caused the teeth in the model to move on withdrawal. Overall,there were significant differences between the three models. There 5 was a significant increase in retentive force of 1.6 times from denture 1 to denture 2, of 7.6 times from denture 2 to denture 3, and 12.3 times from denture 1 to denture 3. Conclusion This study confirmed that guide planes increase the retention of an RPD, but that when guiding surfaces of the denture are adapted closely to the guide planes on the teeth, there is a considerable increase in retention

Thesis (M.S.)--University of Michigan, Ann Arbor, 1977. / Typescript (photocopy). Includes bibliographical references (leaves 59-61). Also issued in print.

Thesis (M.S.)--University of Michigan, Ann Arbor, 1976. / Typescript (photocopy). Includes bibliographical references (leaves 48-49). Also issued in print.

Thesis (M.S.)--University of Michigan, Ann Arbor, 1977. / Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 59-61).

Thesis (M.S.)--University of Michigan, Ann Arbor, 1976. / Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 48-49).

Thesis (doctoral)--Göteborg University, 1994. / Added t.p. with thesis statement inserted. Includes bibliographical references.

Thesis (doctoral)--Göteborg University, 1994. / Added t.p. with thesis statement inserted. Includes bibliographical references.

This study aims to compare the physical properties of denture base resin after staining by beverages, treatment by four cleaning methods, and selecting the optimal cleaning method. Two hundred and ninety square Lucitone dental acrylic specimens were fabricated. Three relevant experiences are performed. Part I will compare cleaning methods effects on physical properties of denture resin. The purpose of this part is to test the effects of different cleaning methods on the physical properties of the denture resin on ideal condition (without stain). Part II will compare the staining effects on denture resin. The purpose of this part is to find the impact of different dyes on the physical properties of the denture resin without cleaning. Part III will compare staining and cleaning effects on denture resin. The purpose of this part is to select the best cleaning methods with less defect and more efficient for denture cleaning. Significance differences are found between different cleaning methods and stains. For all stain, denture cleanser combined brushing is more efficient to remove the stain than other cleaning methods. However, this method causes significate damage to denture base resin. Meanwhile, ultrasonic combine denture cleanser showed lower changes in surface roughness, weight and thickness, and higher surface hardness. In red wine staining, cleaning denture with ultrasound only showed lower differences and higher surface hardness. Within the scope of this study, the optimal selections of denture base cleaning methods for different stains are suggested. For coffee and tea stains, ultrasonication after cleanser application causes fewer effects on physical properties and better efficiency for stain removal than other cleaning methods. For red wine stains, cleaning dentures with ultrasound only cause a fewer impact on material properties and more efficient stain removal. In the clinic, home-care and cleaning protocol should explain to denture patient at the delivery appointment. Instead of giving the universal instruction, customization cleaning protocols are preferred to individual patients. Social hobbies especially the diet of the patient should be analyzed individually. According to the present study, a customized combined cleaning protocol can recommend to the individual patient and the improvement of denture longevity can be predicted. / 2020-08-06T00:00:00Z

Thesis (M.S.)--University of Michigan, 1979.

Thesis (doctoral)--Katholieke Universiteit, Nijmegen, 1992. / Vita. Includes bibliographical references (p. 229-241).