Alternativas para reduzir a sensibilidade dental no clareamento em consultório

Abstract

The objectives of this study were: 1) To evaluate the effect of the application of experimental desensitizing gel vs placebo before in-office dental bleaching, on reducing tooth sensitivity and color change. 2) To evaluate the effect of low power laser in reducing tooth sensitivity resulting from in-office bleaching and color change. For study 1, split mouth, fifty participants with A2 or darker canines were selected and randomly into two groups: application of experimental desensitizing gel (10% calcium gluconate, 0.1% dexamethasone acetate, 10% potassium and 5% glutaraldehyde) and application of placebo gel before in-office bleaching (35% hydrogen peroxide, 1x50 min), for 10 min. TS was assessed immediately and 1 h, 24 h and 48 h after bleaching and recorded by the participants them selves using a 5-point numerical scale (NRS) and visual analogue (VAS 0-10). Color was assessed using visual scales and spectrophotometer initially, one week after each session and thirty days after the completion of bleaching. For study 2, eighty participants were randomized into two groups. Participants in the laser/control group received low-level laser therapy after each in-office bleaching session (35% hydrogen peroxide, 1x50 minutes). SD and color were evaluated in the same way as described for study 1. It was observed after thirty days, in both RCTs performed, significant and similar bleaching between the groups (p > 0.32 for study 1 and p < 0.22 for study 2) and in relation to TS, there was no statistically significant difference between the groups. groups, with OR= 0.65; 0.10 to 4.09; p = 1.0 for study 1 and relative risk of 1.03 (95% CI; 0.94 to 1.11; p = 1.0) for study 2. It can be concluded that the previous application of the experimental desensitizing agent was not effective in reducing the risk and intensity of SD and did not influence the color change of in-office bleaching. Furthermore, the application of the low power laser did not reduce the risk and intensity of SD and did not affect the color change.