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The aim of this study was to evaluate the effects of nanofilled protective resin coating (RC) on the surface roughness (Ra) and color stability ( Δ E ) of resin-based restorative materials (RM) (compomer (C), nanofilled composite (NF), and microhybrid composite (MH)) after being submitted to the ultraviolet aging (UV) method. Thirty-six specimens were prepared ( n = 6 for each group). The Ra and ( Δ E ) values and SEM images were obtained before and after UV. Significant interactions were found among the RM-RC-UV procedures for Ra ( P < 0.001 ) . After the specimens were submitted to UV, the Ra values were significantly increased, regardless of the RC procedure (with RC; P < 0.01 for all, without RC; C ( P < 0.01 ) , NF ( P < 0.001 ) , and MH ( P < 0.001 ) ) for each RM. Significant interactions were found between the RM-RC ( P < 0.001 ) procedures for the Δ E values. The Δ E values were increased in each group after applying the RC procedures ( P < 0.001 ) . Protective RC usage for RM could result in material-related differences in Ra and Δ E as with used UV method.

Effects of Protective Resin Coating on the Surface Roughness and Color Stability of Resin-Based Restorative Materials