In vitro evaluation of visible light-activated titanium dioxide photocatalysis for in-office dental bleaching

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Abstract

The evaluation of the photocatalysis of visible light activated titanium dioxide employed in hydrogen peroxide (H 2 O 2 ) was carried using seven H 2 O 2 solutions (3.5 and 35%) and/or methylene blue (MB), with or without light irradiation (LI); the absorbance of MB was the bleaching indicator. Color analysis was performed on bovine teeth (n=12) using two different concentrations of H 2 O 2 , 6 and 35% associated with titanium dioxide (TiO 2 ). Data were analyzed with one and two-way ANOVA, and significance level of p<0.05. Solutions containing MB, H 2 O 2 at 3.5 or 35%, and TiO 2 , followed by LI, showed significant difference when compared with other groups. Greater MB reduction was found in 35% concentration. H 2 O 2 35%+ TiO 2 gel showed no difference in comparison to control group. All groups for the color analysis assay showed ΔE higher than 3.3. In conclusion, TiO 2 and H 2 O 2 association is a promisor alternative for reducing the clinical time of in-office dental bleaching.

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Cuppini, M., Leitune, V. C. B., De Souza, M., Alves, A. K., Samuel, S. M. W., & Collares, F. M. (2019). In vitro evaluation of visible light-activated titanium dioxide photocatalysis for in-office dental bleaching. Dental Materials Journal, 38(1), 68–74. https://doi.org/10.4012/dmj.2017-199

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