Color Stability and Surface Roughness of Resin Based Direct and Indirect Restorative Materials

Abstract

Purpose: This study investigated discoloration and surface roughness (Ra) of resin-based computer aided design(CAD)/computer aided manufacturing (CAM) blocks and direct and indirect resin composites after staining with coffee.Materials & Methods: Using a Teflon mold, 60 disc shaped specimens (8×2 mm2) were fabricated from direct (EsteliteAsteria and GrandioSO) and indirect (Gradia Plus) resin composites, and 30 resin CAD/CAM specimens (12×14×2 mm3)were prepared from resin composite CAD/CAM blocks (Vita Enamic, Brilliant Crios, and Cerasmart) (n=10). A contact typeprofilometer was used to determine the Ra of all 60 polished samples. All specimens were thermocycled between 5 and55°C for 3000 cycles, and immersed in coffee solution (37°C) for 1 and 7 days. A spectrophotometer was used todetermine the color change (∆E00) with the CIEDE2000 formula after the specimens were re-polished. One-way analysisof variance (ANOVA) and Tukey multiple comparison test was performed to analyze the data (p