Repolishing in situ eroded CAD/CAM restorative materials and human enamel

This study aimed to evaluate the effects of repolishing on surface microhardness (SMH), color change (ΔE), and translucency parameter (TP) previously in situ eroded computer-aided design/computer-aided manufacturing (CAD/CAM) restorative materials human enamel. Each 8 volunteers wore an intraoral appliance containing 3 CAD/CAM material specimens (IPS e.max CAD lithium disilicate ceramic, Lava Ultimate hybrid poly (methyl methacrylate) (PMMA) block) 1 enamel specimen. The were subjected erosion cycles by rinsing with a cola drink (4 × 5 min/day) for 14 days. After erosion, polished silicone polishing system (Ceramister, Shofu Inc, Kyoto, Japan). SMH determined at baseline (T1), after (T2), (T3). ΔE TP values further calculated. data statistically analyzed using repeated-measures analysis variance (ANOVA) Bonferroni's test (α = 0.05). decrease was observed (all P < 0.001), (P 0.016). (ΔE 7.32) 3.19) exceeded clinically unacceptable threshold erosion. repolishing, T3 significantly higher than that T2 0.001). No significant difference found between T3. In conclusion, negatively affected properties appearance Repolishing contributed restoring compromised certain extent. However, did not restore