Effect of Delaying Toothbrushing During Bleaching on Enamel Surface Roughness: An In Vitro Study

Abstract

SUMMARY This study aimed to evaluate the effect of toothbrushing on enamel surface roughness at three different intervals after daily bleaching treatment. Eighty enamel slabs were initially evaluated for surface roughness and then randomly divided into four groups. The bleaching procedure was carried out for 21 days, six hours daily. In the control group (group 1), the specimens were not brushed after bleaching, but in groups 2–4, they were brushed with toothpaste immediately, one hour, or two hours after bleaching, respectively. Then the specimens were stored in artificial saliva. Enamel surface roughness was reevaluated at the end of the period. Kruskal-Wallis and Mann-Whitney U tests showed statistically significant differences in the means of surface roughness values between the immediately brushed group and the three other groups (p<0.001). Daily toothbrushing immediately after bleaching increased enamel surface roughness; however, postponing the procedure for one or two hours after daily bleaching and exposing the specimens to artificial saliva during the study period resulted in enamel surface roughness comparable to that of the control group.

Effect of an in-Office Bleaching Agent Containing Two Different Concentrations of Titanium Dioxide Nano Particles on the Color and Surface Roughness of Enamel.

“…These results were in accordance with previous studies (18)(19)(20) . They concluded that using bleaching gels with higher peroxide concentrations might cause surface alterations to the superficial enamel affecting its roughness.…”

Toothbrushing abrasion susceptibility of enamel and dentin bleached with calcium-supplemented hydrogen peroxide gel

“…Since abrasivity was the determining factor for surface roughness, postponing the brushing procedure 1 h after bleaching did not excert a protective effect for minimizing the surface roughness effects, contrarily as reported previously [39]. The irregularities caused by brushing probably were coarser than the supposed repairing action of saliva over the surface morphologic irregularities of bleached enamel and dentin.…”

Effect of coffe and a cola-based soft drink on the color stability of bleached bovine incisors considering the time elapsed after bleaching

“…Therefore, it can be hypothesized that prolonged exposure to a CBSD after dental whitening could further increase enamel roughness and decrease hardness. In a similar way, it has been observed that toothbrushing immediately after dental bleaching may increase enamel roughness 19 and that postponing oral hygiene for one or two hours after bleaching is advised 20 . It should be noted that if samples were stored in artificial saliva after bleaching, their ability of being stained could be reduced due to the potential remineralizing effect this solution.…”