Is the at-home bleaching treatment applied only on the lingual surface as effective as that on the buccal surface? A randomized clinical trial.

Abstract

This double-blind randomized clinical trial compared the effectiveness and bleaching sensitivity (BS) of at-home dental bleaching performed on the buccal surface and on the lingual surface. Using a split-mouth design, 25 patients were assigned to two bleaching groups: 10% hydrogen peroxide (White Class 10%, FGM) applied once daily for 60min to the buccal surface (BSB) and 10% hydrogen peroxide (White Class 10%, FGM) applied once daily for 60min to the lingual surface (LSB), both for 14days. The color was evaluated before bleaching, after the first and second weeks, and 1month after the bleaching using Vita Classical and Vita Bleachedguide scales and a Vita Easyshade spectrophotometer. BS was recorded daily using a 0-4 numerical rating scale and a 0-10 visual analogue scale. The following statistical tests were used: color changes (Mann-Whitney), absolute risk of BS (McNemar's exact), and the intensity of BS (Mann-Whitney). In all statistical tests, the significance level was 5%. Significant bleaching was observed after the end of bleaching in both groups, with higher bleaching effectiveness for BSB when compared to LSB (p < 0.05). Regarding BS, no significant difference was observed between groups (p = 1.00). The 10% hydrogen peroxide (White Class 10%, FGM) applied in at-home bleaching performed on the lingual surface did not promote a similar result of color change compared to on the buccal surface. Regarding BS, there was no significant difference between the groups. The at-home bleaching performed on the lingual surface promotes a lower result in the color change. BS is similar between the groups. RBR-283byt.