Eficácia do laser de baixa potência no tratamento de sensibilidade pós clareamento dentário: revisão sistemática

Abstract

One of the main side effects of tooth whitening is sensitivity. Thus, several strategies have been proposed to control this adverse effect. This systematic review aimed to analyze the effectiveness of photobiomodulation in the treatment of dentin hypersensitivity after tooth bleaching. A search was performed in six databases (BVS, PubMed, Scopus, Web of Science, Scielo, Cochrane library) up to August 2022. Only studies with a randomized clinical trial design or split-mouth that performed in-office bleaching on patients were included. , evaluated post-bleaching sensitivity, and used a low-power laser. The search was not limited by language or time. Due to the great heterogeneity observed between the studies, the data were analyzed descriptively. Of the 483 records found, 368 remained after removing duplicates. Thus, 20 articles were accessed in full and only eight met the eligibility criteria and were included in this review. Most of the studies (n=6; 75%) were split-mouth clinical trials, with the vast majority of them (n=7/87.5%) carried out in Brazil. Six studies used hydrogen peroxide at a concentration of 35%. Considering the eight studies included in this review, only one study did not find a significant reduction in sensitivity after performing tooth bleaching in at least one of the periods evaluated. This reduction was observed at different periods varying between the included studies. In general, after the fourth day of in-office bleaching, no sensitivity was observed, even in the placebo group. The moment of laser application (before/after whitening) does not seem to influence the effectiveness of the treatment. Thus, given the limitations of the present study, we observed that laser photobiomodulation seems to have a positive effect in preventing sensitivity after tooth bleaching. This effect seems to occur only in the first few days after applying the gel.