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Effectiveness of and dental sensitivity to at-home bleaching with 4% and 10% hydrogen peroxide: A randomized, triple-blind clinical trial

Abstract:

Objectives: To evaluate the risk for and intensity of tooth sensitivity and color change of athome dental bleaching with 4% and 10% hydrogen peroxide (HP). Methods: For this study, 78 patientswere selected according to the inclusion and exclusion criteria and randomized into two groups: HP 4 (White Class 4%, FGM) and HP 10 (White Class 10%, FGM). In both groups, the at-home bleaching was performed for a period of 30 minutes twiceadayfortwoweeks.The colorwasassessed by Vita Classical, Vita Bleachedguide 3D-MASTER and spectrophotometer Vita Easyshade (Vita Zahnfabrik) at baseline, during bleaching (firstandsecondweeks)andafterbleaching(one month).Patients recordedtheir toothsensitivity using a numeric rating scale (0-4) and visual analog scale (0-10). Data from color change (DeltaEdata)was submitted to two-way analysis of variance. The color change data in Delta SGU from the two shade guide units were compared with the Mann Whitney test. The risk of tooth sensitivity was evaluated by x2 test and the intensity of tooth sensitivity from both scales was evaluated by aMann-Whitney test (α=0.05).