July 2010
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10 Reads
Objectives: The purpose of this study was to evaluate the wear rates of provisional restorative materials by in vitro system. Methods: Disk specimens (3.0mm thick, 8.0mm diameter) were fabricated with tested materials including a chemical-polymerizing acrylic resin with TMPT filler (Provista, Sun Medical), two chemical-polymerizing acrylic resins (Metafast, Sun Medical and UnifastIII, GC), two photo-polymerizing acrylic resins (Unifast LC, GC and Hardbite, Yoshida), and two chemical-polymerizing composite resins (Protemp Plus, 3M ESPE and Luxatemp, DMG). The specimens were secured to brass cups with an auto-cured acrylic and fixed to the UAB wear simulator. Localized wear test was carried out using a hemispherical steel tip and a PMMA/water slurry with 75 N at 1.2 Hz for 100,000 cycles. Wear depths were measured using a non-contact profilometer (Proscan2000, Scantron Industrial). The data (n=5) were statistically analyzed with one-way ANOVA and Tukey's test (=0.05). Results: The results of the wear tests are presented in the table below. Groups with identical letters are not significantly different (p>0.05). Conclusion: The mean wear values of composite materials were significantly lower than all other materials except Provista. The mean wear value of Provista was significantly lower compared to other chemical-polymerizing acrylics. There were no significant differences among two photo-polymerizing acrylics and two chemical-polymerizing acrylics.