Abstract
Introduction: The use of dental composites has become increasingly common due to their aesthetic appeal and high durability. However, achieving color stability in composites remains one of the main challenges. On the other hand, the use of whitening toothpaste may affect the properties of composites. This study aimed to investigate the impact of hydrogen peroxide-containing whitening toothpaste on color change and surface roughness of Extra Bleach, Bleach, and A1 composites. Methods & Materials: This experimental study was conducted with a quantitative research design. Samples of Extra Bleach, Bleach, and A1 composites were randomly divided into three groups. Color changes (ΔE) were measured using a spectrophotometer, and surface roughness (Ra) was measured using a laser profilometer. The data were analyzed using appropriate statistical tests. Results: There was a significant difference in surface roughness between the three composite groups. Additionally, this difference was significant between 1A and BW, as well as between 1A and XBW (but no significant difference was found between BW and XBW). The XBW shade showed the greatest increase in surface roughness, while 1A exhibited the smallest increase. Regarding color stability, the color change observed in all three composites was significant. The lowest ΔE was seen in 1A, while the highest ΔE was observed in XBW. Conclusion: Hydrogen peroxide-containing whitening toothpaste increases surface roughness, with a greater increase in Bleach composites. The best color stability was seen in the 1A composite, followed by BW, and the least stability was observed in XBW. Bleach composites have lower strength and color stability compared to the 1A composite.