Comparative Effect of Casein Phosphopeptide Amorphous Calcium Phosphate and Resin Infiltrant on Brown Spot Color Parameters after Using 20% Carbamide Peroxide

Background and Aim: Tooth-colored restorations are the current strategy for treatment of aesthetically unpleasant brown spots (BSs). Considering the importance of conservative dentistry, this study aimed to assess the effect of resin infiltrant (RI) and casein phosphopeptide amorphous calcium phosphate (CPP-ACP) after the application of 20% carbamide peroxide (CP) on BS color parameters in the esthetic zone. Materials and Methods: This experimental study was conducted on 70 extracted sound human teeth with BSs. The specimens were first subjected to the application of 20% CP and were then randomly divided into two groups of CPP-ACP and RI. Specimens were subjected to colorimetry before the intervention, after bleaching and after the application of RI or CPP-ACP using a spectrophotometer. Data were statistically analyzed using SPSS version 20, paired t-test, independent t-test and repeated measures ANOVA with p 0.05 level of significance. Results: CP (20%) significantly increased the L* and b* and decreased the a* parameter (p 0.001). CPP-ACP caused no change in a* and b* parameters of BS (p 0.05); however, the L* significantly increased (p 0.001). RI significantly decreased the a* parameter (p 0.001); but the reduction in L* and increase in b* were not significant (p 0.05). Comparison of the two groups revealed that only the color change (ΔE) during the bleaching procedure was significant (p 0.001). ΔE of BS and the adjacent enamel did not change significantly in any step of the procedure in the two groups (p 0.05). Conclusion: Based on the results, aesthetically unpleasant BSs on teeth may be treated using a bleaching agent along with RI or CPP-ACP. RI seems to have a superior efficacy in increasing the translucency compared to CPP-ACP.