Regresar

Comparison of the effects of inoffice bleaching times on whitening and tooth sensitivity: A single blind, randomized clinical trial

Abstract:

Objectives: The objective of the present study was to compare the bleaching efficacy (BE) and tooth sensitivity (TS) of in-office bleaching applied under different time protocols. Methods and Materials: Fifty-three patients were randomly distributed into three groups: the bleaching agent was applied in one (1315), two (2315), or three (3315) 15-minute applications. The labial surfaces of the anterior teeth were bleached using a 35% hydrogen peroxide gel. Two bleaching sessions with a one-week interval between were performed. The shade evaluation was performed with a visual shade guide and spectrophotometer before and 30 days after bleaching. Participants recorded TS with a five-point verbal scale. Color change was analyzed by one-way analysis of variance and Tukey tests. The absolute risk of TS and TS intensity were evaluated by the Fisher exact and Friedman/Kruskal-Wallis tests, respectively (a= 0.05). Results: Significant whitening was observed in all groups, with statistically lower BE for the 1315 group (p,0.05). The absolute risk of TS (95% confidence interval) was lower for the 1315 group than for the other groups (p,0.05). The TS intensity of the 3315 group was statistically higher than that associated with the other protocols (p,0.05). Conclusions: A single 15-minute application produced less TS but reduced BE. The protocol with 2315 produced a degree of BE similar to that of the 3315 group, but with reduced overall TS intensity.