Effect of Commercial Whitening Toothpastes on Color Stability and Surface Roughness of Two Different Composite Resins

Objective: The aim of this in vitro study is to compare the effects of different whitening toothpastes on the color stability (CS) and surface roughness (SR) of 2 composite resins. Methods: A hundred disc-shaped specimens were prepared from Filtek Z250 microhybrid and Charisma Topaz nanohybrid composite resins. The discs were divided into 5 subgroups: artificial saliva, Colgate Active Charcoal, Yotuel, Opalescence, and Sensodyne Promine toothpastes. The initial roughness and color values of the samples were measured. In order to evaluate the CS and SR, all specimens were subjected to coffee and brushing cycles. A three-way mixed analysis of variance was used to analyze the data. All analyses were performed considering α = 0.05. Results: While the Z250 composite showed higher ∆E values than the other composite (P < .05), no significant differences were observed between the composites regarding SR (P > .05). Among the whitening toothpaste groups, there were no significant differences in ∆E values (P > .05) except for the control group. After an 8-week cycle, the activated carbon-containing toothpaste group showed a higher SR than the control group (P < .05). Conclusion: All toothpastes were effective in removing discoloration from composite res-ins, depending on the composite resin used. However, the whitening toothpastes tested (after 8 weeks of use) increased surface roughness regardless of the composite resins used, but not more than regular toothpaste (not containing a whitening ingredient).