Resumo

CERQUEIRA, Rayllan Ribeiro de et al. Assessing the effect of a desensitizing agent on dental sensitivity and effectiveness of bleaching. Rev. Assoc. Paul. Cir. Dent. [online]. 2013, vol.67, n.1, pp. 64-67. ISSN 0004-5276.

The aim of this clinical study was to evaluate the bleaching efficiency (BE) and tooth sensitivity (TS) of a desensitizing agent used before in-office bleaching with 20% hydrogen peroxide gel with calcium. It was selected 30 patients, which were randomized into placebo and experimental groups. A placebo or desensitizing gel (Desensibilize KF 2%, FGM) was applied for 10 minutes before in-office bleaching with 20% hydrogen peroxide (Whiteness HP Blue, FGM), in two sessions with one application of 50 minutes. This protocol was repeated on the first and second sessions, with a week of interval between sessions. The patients used a scale of 0 to 4 to write down their tooth sensitivity. The color was registered with a Vita scale before and after each session. The BE was analyzed by ANOVA and Tukey tests. The percentage of patients with TS, as well as TS intensity were analyzed by Fisher's exact and Mann-Whitney tests. At the end of two sessions of dental bleaching, 90% of patients achieved A1/B2 color. In-office bleaching was effective for both groups with color change between 6 and 7 units in Vita scale. It was reported sensitivity in 33.3% of patients from placebo group and 20% from experimental group. The intensity of TS was similar for both groups (p>0.05). The use of a desensitizing agent before in-office dental bleaching using 20% hydrogen peroxide had no effect on BE and did not reduce the prevalence and intensity of tooth sensitivity.

Palavras-chave : Tooth Bleaching; Hydrogen Peroxide; Dentin Sensitivity.