2013 Volume 56 Issue 3 Pages 169-177
Purpose: To determine the localized wear and flexural properties of resin composites for posterior lesions. Methods: Five resin composites, Clearfil AP-X (Kuraray Noritake Dental), Estelite Σ Quick (Tokuyama Dental), Estelite P Quick (Tokuyama Dental), Solare (GC), and Venus Diamond (Heraeus Kulzer, Germany), were used in the current study. Ten specimens of each resin composite were prepared in custom fixtures, and subjected to 400,000 wear machine cycles to simulate localized wear. The total maximum depth and volumetric loss of the wear facets were calculated for each specimen using a profilometer. A three-point bending test was performed to determine the flexural strength, modulus of elasticity and resilience. Values were statistically compared using one-way analysis of variance (ANOVA) followed by Tukey's Honestly Significant Difference (HSD) test. Results: The wear depth ranged from 66.9 to 134.1 μm, and the volumetric loss ranged from 0.015 to 0.074 mm3, with significant differences observed among restorative materials. The flexural strength, elastic modulus, and resilience ranged from 88.9 to 186.6 MPa, from 4.7 to 15.9 GPa, and from 7.7 to 9.7 MJ/m3, respectively. Venus Diamond, which contains nano-hybrid fillers, exhibited the highest value of flexural strength. Conclusion: The wear and flexural properties of the resin composites classified into hybrid or nano-hybrid suggested higher wear resistance and mechanical properties compared to those employing prepolymerized filler particles.
