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Quintessence Int 51 (2020), No. 10     16. Oct. 2020
Quintessence Int 51 (2020), No. 10  (16.10.2020)

Page 788-797, doi:10.3290/j.qi.a45173, PubMed:32901243


Bleaching sensitivity with a desensitizing in-office bleaching gel: a randomized double-blind clinical trial
Maran, Bianca Medeiros / Vochikovski, Laína / Hortkoff, Diego Rafael de Andrade / Stanislawczuk, Rodrigo / Loguercio, Alessandro D. / Reis, Alessandra
Objectives: This split-mouth study assessed the bleaching sensitivity (risk and intensity) and color change after in-office bleaching using a desensitizing-containing (5% potassium nitrate) and a desensitizing-free 35% hydrogen peroxide gel. The null hypothesis was that there would be no differences between study groups regarding bleaching sensitivity.
Method and materials: Sixty patients participated in this split-mouth study. The subjects received desensitizing-containing hydrogen peroxide in half of the maxillary arch, and the other half received a desensitizing-free hydrogen peroxide, defined by random sequence, in two dental bleaching sessions. The bleaching sensitivity was evaluated during bleaching and from 1 h to 48 h after each bleaching session using a visual analog scale and numeric rating scale; the McNemar test, the Wilcoxon signed-rank test, and the Student-Newman-Keuls test were used for statistical analysis. The color was measured at baseline and 30 days post-bleaching, evaluated with paired t tests (P = .05).
Results: Statistically similar risks of bleaching sensitivity were observed (P = 1.000), but the intensity of bleaching sensitivity was lower (P < .011) on average by 1.32 visual analog scale units in the group bleached with the desensitizer-containing gel during up to 24 h assessment times. No statistical difference in color change was observed between groups (P > .321).
Conclusion: The incorporation of 5% potassium nitrate into in-office bleaching gels does not reduce the risk of bleaching sensitivity, but it reduces its intensity slightly without jeopardizing color change.

Keywords: dentin sensitivity, hydrogen peroxide, randomized controlled trial, tooth bleaching agents
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