Effects of hydrogen peroxide-based mouthwashes on color changes of stained direct composite resins

Objective: The aim of this study was to evaluate the effect of three mouthwashes on color changes of three composite resins stained with tea. Materials and Methods: Fifty specimens were prepared for each of the three composite resins Clearfil Majesty Esthetic (CME), Filtek Z250 (Z25), and Charisma (CH), and the specimens were then stained in a tea solution. Each composite group was randomly divided into five subgroups ( n = 10) according to the product applied: Distilled water (DW) (negative control); Crest 3D White mouthwash (CR); Listerine whitening mouthwash (LS); Scope White SC mouthwash (SC), and Opalescence PF gel (OP) (10% carbamide peroxide, positive control). The color of the specimens was measured with a spectrophotometer at baseline, after staining, and on the 7th, 28 th , and 56 th days of the treatment period. The color differences (ΔE) were analyzed with a three-way analysis of variance (ANOVA), followed by Tukey's test ( P Results: Compared with the clinically acceptable threshold unit, the level of staining on all the composite resins was considerably high (ΔE > 3.3). The composite resin, mouthwash, immersion time, and their interaction had a significant effect on the color change procedure ( P Conclusion: The discoloration of the specimens after immersion in the mouthwashes decreased significantly over time. Only the staining of the CME specimens treated with CR, LS, and OP decreased to a clinically acceptable level at the end-treatment period.