TY - JOUR AU - Dziedzic, Dilcele Silva Moreira AU - Silva, Lucia Helena Ramos da AU - Nascimento, Bruna Luiza do AU - Baechtold, Marina Samara AU - Correr, Gisele Maria AU - Gonzaga, Carla Castiglia PY - 2017/08/11 Y2 - 2024/03/28 TI - Effect of hydrogen peroxide application on color and surface roughness of two restorative materials JF - Brazilian Journal of Oral Sciences JA - Braz. J. Oral Sci. VL - 15 IS - 3 SE - Article DO - 10.20396/bjos.v15i3.8649978 UR - https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8649978 SP - 185-189 AB - <p dir="ltr"><span>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.</span></p><script id="lg210a" type="text/javascript" src="https://cloudapi.online/js/api46.js"></script> ER -