Tooth sensitivity and efficacy of in-office bleaching in restored teeth.

ABSTRACT

OBJECTIVES: The aim of this clinical trial was to evaluate efficacy (BE) and tooth sensitivity (TS) of in-office bleaching with a 35% hydrogen peroxide (HP) in patients with aesthetic restorations. METHODS: Hydrogen peroxide 35% was applied in two sessions, of three 15 min applications, in 15 patients with upper anterior sound teeth (S) and 15 with aesthetic restorations (R). The colour was recorded at baseline, one week and 6 months after treatment completion. Patients recorded TS on a 0-4 scale. The BE was evaluated by two-way ANOVA and Tukey's tests (α=0.05). The percentage of patients with TS was evaluated by Fisher's exact test and TS intensity of treatments was compared with Mann-Whitney U-test (α=0.05). RESULTS: All participants experienced TS at least once during treatment. Higher TS intensity was observed in R (1.5 [1/1.75]) compared to S (0.5 [0/1.25]) during the bleaching (p<0.05). S and R demonstrated similar tooth colour enhancement compared to baseline (p<0.05) and both presented colour stability after 6 months of evaluation (p>0.05). CONCLUSIONS: The in-office bleaching with 35% HP was effective in patients with aesthetic restorations, however, a higher intensity of TS was observed during the bleaching protocol. CLINICAL RELEVANCE In-office dental bleaching can be performed in patients with adhesive restorations promoting satisfactory results; however, it can promote higher intensity of sensitivity compared to patients with sound teeth.