To try to reduce the deleterious effects of tooth whitening, bioactive materials have been used. Forty enamel/dentin blocks were stained on dark tea and randomly assigned into four groups (n=10): control group (unbleached), HP35 % (35 % hydrogen peroxide), BG45S5 (Bioglass 45S5® incorporated into HP35 %), and BIO (Biosilicate® incorporated into HP35 %). Colorimetric analysis and microhardness evaluation was performed at baseline, 24 hours and 7 days after the final whitening session. Two-way ANOVA for repeated measures and Bonferroni test was used at a significance level of 5 %. All the coordinates (∆L*, ∆a*, ∆b*, ∆E00 and WID) showed a difference between the control group and the experimental ones (p<0.05). ∆E00 values indicated that all the groups did not show changes between the evaluation times (p>0.05), which suggest a color stability over a week. In contrast, after 7 days, the WID showed that control and PH35 % were different than the other groups (p < 0.023), although no differences were observed between BG45S5 and BIO groups (p = 1.000). No differences in enamel microhardness were found between the groups within the same evaluation time (p>0.05). The microhardness did not change over time (p>0.05), except for 35 % HP. In conclusion Bioglass 45S5® and Biosilicate® prevented enamel damage without negatively affect the whitening efficacy.
KEY WORDS: bioactive glass, enamel, hydrogen peroxide, tooth whitening, microhardness, tooth color.
How to cite this article
COSTA, J. L. S. G.; BESEGATO, J. F.; MANZOLI, T. M.; NOGUEIRA, B. R.; DE ALMEIDA, E. N. M. & KUGA, M. C. Influence of bleaching agent containing bioactive glass on color and microhardness of bovine enamel. Int. J. Odontostomat., 16(4):497-503, 2022.