Date of Award

Fall 2005

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Dentistry

First Advisor

Waliszewski, Kenneth J.

Second Advisor

Ziebert, Gerald J.

Third Advisor

Berzins, David W.

Abstract

A provisional restoration is dentistry's way of managing teeth that are being prepared for restorations such as crowns and/or bridges. The physical properties of the dental polymers used for provisional restorations can be altered in order to improve their strength. Investigations have shown the outcome of reinforcement on the fracture resistance of a provisional partial denture fabricated simulating the posterior aspect of the mouth (vertical load, straight segment). No investigations have reported on the occurrence of fiber reinforcement in provisional FPDs simulating the anterior aspect of the mouth (off-vertical axis forces and curved segment). The purpose of this study was to evaluate the outcome of Kevlar fiber reinforcement in provisional restorations located in the anterior segment of the upper maxilla. Two materials were tested, Alike (PMMA) and Integrity (BIS-GMA), to which Kevlair was added. A total of 60 specimens were made; three groups per material, control, fiber placed clinically, and fiber placed with sticks. Each specimen was loaded to failure using an Instron machine. Data was analyzed with two-way ANOVA followed by a post-hoc Tukey test for multiple comparisons. Results are consistent with literature. BIS-GMA displayed more strength than PMMA with no fiber placement. An increase in load to failure when the fiber was incorporated in the PMMA group was observed for the fiber placed clinically group, while the same test showed a drop in the load to failure when the fiber was added to BIS-GMA specimens. For all the specimens with fiber, it was observed that when the catastrophic failure occurred, the two segments remained in one piece.

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