Abstract
Provisional restorations are used to prevent damage from occurring during the interim period between tooth preparation and fitting a definitive restoration, and to ensure occlusion and aesthetics. Maintaining long term stability of provisional restorations in an oral environment is required for complex treatment. Recently, bis-acryl base resins containing inorganic fillers have been made available to develop long term stability in an oral environment. Although there are several pieces of research that refer to their mechanical properties, little is known about their long term stability and erosive wear behavior. The purpose of this study was to determine the long term stability and erosive wear behavior of provisional resins. During the course of this research, we compared the following properties; flexural strength after thermal cycling, water sorption, density, tooth-brushing abrasion, and the sliding-impact wear of bis-acryl provisional resins compared with PMMA resins. The results were as follows: 1. Bis-acryl provisional resins reveal a significantly higher flexural strength and elastic modulus in comparison to PMMA provisional resins. 2. Bis-acryl provisional resins reveal a significantly lower water sorption than that of PMMA provisional resins. On the other hand, bis-acryl provisional resins demonstrate a higher density in comparison to PMMA provisional resins. 3. From results obtained in a tooth-brushing abrasion test, bis-acryl provisional resins demonstrate a significantly lower abrasion rate in comparison to PMMA provisional resins. 4. From results obtained in a sliding-impact wear test, bis-acryl provisional resins demonstrate a significantly lower abrasion rate and depth of wear in comparison to PMMA provisional resins.