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Effect of hydrogen peroxide application on color and surface roughness of two restorative materials
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Resin-modified glass-ionomer cement. Composite. In vitro bleaching. Color behaviour.

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Dziedzic DSM, Silva LHR da, Nascimento BL do, Baechtold MS, Correr GM, Gonzaga CC. Effect of hydrogen peroxide application on color and surface roughness of two restorative materials. Braz. J. Oral Sci. [Internet]. 2017 Aug. 11 [cited 2023 Sep. 22];15(3):185-9. Available from:


Aim: This study investigated the effect of an in-office bleaching technique on lightness, color and surface roughness of two commercially available materials: a resin-modified glass-ionomer cement and a nanohybrid resin composite. Methods: Twelve disk-shaped specimens were prepared with both materials. The samples were bleached with 35% hydrogen peroxide. Bleaching was tested initially onto a smooth surface and later onto a polished one of the same specimens. The effect of the treatments on lightness and color was verified with a spectrophotometer. Surface roughness was measured with a digital surface roughness tester. The data were statistically analyzed by repeated measures ANOVA and post hoc Tukey’s test (alpha = 0.05). Results: Significant variation in lightness and color was observed on the resin-modified glass-ionomer cement after the first bleaching procedure. Roughness increased significantly only after polishing the resin-modified glass-ionomer cement surface. Composite color variation was evident in the last observation period, but roughness and lightness variation due to bleaching and polishing was not significant. Conclusion: The bleaching treatment caused significant color alterations on the materials tested. This study observed that the application of in-office bleaching onto the glass-ionomer cement promoted clinically observable color alteration, and polishing after bleaching is contraindicated for this material.
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