Color stability and surface roughness of resin based direct and indirect restorative materials

Purpose: This study investigated discoloration and surface roughness (Ra) of resin-based computer aided design (CAD)/computer manufacturing (CAM) blocks direct indirect resin composites after staining with coffee. Materials & Methods: Using a Teflon mold, 60 disc shaped specimens (8×2 mm2) were fabricated from (Estelite Asteria GrandioSO) (Gradia Plus) composites, 30 CAD/CAM (12×14×2 mm3) prepared composite (Vita Enamic, Brilliant Crios, Cerasmart) (n=10). A contact type profilometer was used to determine the Ra all polished samples. All thermocycled between 5 55°C for 3000 cycles, immersed in coffee solution (37°C) 1 7 days. spectrophotometer color change (∆E00) CIEDE2000 formula re-polished. One-way analysis variance (ANOVA) Tukey multiple comparison test performed analyze data (p<0.05). Results: The lowest degree among materials tested found Vita Enamic block (p<0.001), whereas highest Gradia Plus (p<0.001). There no significant difference seen initial values groups (p=0.249). No improvement observed except Cerasmart polishing. Conclusion: Direct have higher potential over blocks, they are less prone than