Semester

Summer

Date of Graduation

2010

Document Type

Thesis

Degree Type

MS

College

School of Dentistry

Department

Not Listed

Committee Chair

Mark W. Richards.

Abstract

Objectives. To investigate the effect of acrylic resin thickness and the stud attachment housings on the maximum breaking load, flexural strength and flexural modulus of denture base acrylic resins overlying implant overdenture attachments.;Methods. Fifty-two rectangular specimens were fabricated from high impact denture acrylic resin (Lucitone 199). Forty specimens contain 2.00 mm height Locator attachment titanium denture caps with black processing males, 12 specimens did not include the denture cap. All specimens were fabricated according to ANSI/ADA SPECIFICATION NO. 12-2002 for testing denture base resin with constant measurements of 64 mm in length, 10 mm in width, and variable testing thickness. The specimens were divided into four testing groups according to different thickness of 3, 4, 5, and 6 mm. Each group had 10 specimens with denture cap and 3 specimens without denture cap. Specimens were subjected to 3-point-bending flexural test till fracture using the Instron Universal testing machine. After data collection, mean values and standard deviations were calculated and a two-way analysis of variance (ANOVA) was used to evaluate the effect of denture base thickness, on the flexural strength and modulus of the control and Locator testing specimens.;Results. The data collected showed a positive effect with the use of Locators caps in test specimens on the flexural modulus and maximum displacement. Results showed a positive relationship between maximum load, maximum displacement at break and acrylic thickness. There was no significant effect of different acrylic thicknesses on the flexural strength or flexural modulus.;Conclusions. Evaluation of the available interarch distance, proper diagnosis, and treatment planning is of critical importance to minimize prosthesis complications and failure. Implant-retained overdentures utilizing a low profile stud attachment (Locators by Zest) is a recommended treatment option for patients with compromised interarch space. Implant stud attachment components integrated in denture resin has a positive effect on the flexural modulus. The stiffness of the denture resin increased when Locator caps were contained in the specimens compared to specimens with no caps. There was a positive effect of acrylic thickness on the maximum load at break and maximum displacement. Increase acrylic thickness will lead to higher maximum load and decreased incidence of overdenture fractures.

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