Wear resistance of CAD/CAM composite resin blocks

Abstract

Purpose: The aim of the study was to investigate twoand three-body wear resistance of CAD/CAM composite resin blocks. Methods and materials: Six composite resins (AVE, BLO, CER, GRA, KZR, and ULT), one hybrid ceramic (ENA) and one feldspar ceramic (VIT) block materials for CAD/CAM were examined. Six specimens each were tested in a ball-on-disc wear device fitted with a zirconia ball (50N load, 1.2Hz) in water for two-body and in poppy seed slurry for three-body wear evaluation. Volume loss after 10k cycles was quantified using a digital CCD microscope. Statistical analysis: ANOVA and Tukey’s multiple comparisons (a=0.05). Results: Two-body wear for composite resin blocks was small, hybrid ceramic and ceramic blocks showed larger volume loss. Three-body wear was very low for all materials. All CAD/CAM composite resin block materials investigated displayed lowwear compared to previous data reported for direct posterior composites carrying out the same wear test. Conclusion:The blockmaterials are considered suitable for fabrication of single full crown restorations on premolar teeth.