Clareamento dental em pacientes com sensibilidade: efeito do uso prévio de dentifrícios dessensibilizantes

Abstract

One of the alternatives proposed to decrease the sensitivity generated by the bleaching procedure is the continuous use of desensitizing dentifrices. This study aimed to evaluate the efficacy of 5% potassium nitrate and sodium fluoride dentifrices in reducing the sensitivity related to tooth whitening. For this, a double blind, randomized and parallel clinical study (examiner and patient) was performed. Thirty-eight patients older than 18 years old and with a history of sensitivity were randomly assigned to two treatments: PNG, which used the dentifrice with potassium nitrate plus sodium fluoride, and SFG, which used the dentifrice only with sodium fluoride. Sensitivity evaluation was performed at different times and between PNG and SFG treatments. We used the five-point verbal scale (NRS) and visual analogue scale (VAS) to measure dental sensitivity, so that temporal and inter-treatment differences were assessed using the Wilcoxon Signed Rank and U Mann-Whitney tests , as well as ANOVA. The post hoc Tukey test was used to evaluate the frequency of pain events in different dental elements. The analysis of dental color variation between the initial and final times was performed using the ANOVA test. In all statistical tests, the level of significance was 5%. The methods used to measure the dental color were the Vita Classical scale and the Easy Shade Spectrophotometer. The analyzes showed no significant differences (p> 0.05) in the efficacy of booth PNG and SFG treatments to reduce the dental sensitivity according to NRS and VAS scales. Significant color change of approximately seven color guide units in the Vita Classical scale as well as the spectrophotometer results showed that there was no significant difference between the effectiveness of dental bleaching from both treatments. Therefore, the treatments had similar efficacy to reduce the post-bleaching dental sensitivity and did not influence the success of dental whitening.