Department of Restorative Dentistry, School of Dentistry, State University of Western Paraná, Cascavel, Paraná, Brazil.
Division of Dental Materials, Department of Dental Materials, Piracicaba Dental School, State University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil.
Am J Dent. 2021 Apr;34(2):70-74.
To evaluate the effect of two desensitizing agents applied before in-office bleaching, on the degree of whitening and dentin sensitivity.
Participants were randomly assigned to the groups, according to the desensitizing agent used, with n=10 for each one. The bleaching was performed with 35% hydrogen peroxide, divided according to the desensitizing agent used prior to the bleaching procedure: Placebo (PL); Desensibilize KF with potassium nitrate and 0.2% sodium fluoride (PN); and Oxa-Gel with potassium oxalate (PO). The level of color saturation was assessed at the beginning of treatment and after 1 week of its completion by means of comparative method with the aid of a color scale. The degree of sensitivity (DS) was noted by the subjects with the aid of a visual scale throughout the time that the bleaching agent remained in contact with the teeth (5, 10, 15, 20, 25 and 30 minutes) as well as 1, 24 and 48 hours after the end of application. Pain and the degree of color saturation were evaluated using the Shapiro-Wilk test. The DS was assessed by Kruskal-Wallis and Dunn's tests. The color was evaluated by ANOVA and Tukey's HSD.
There was no significant difference in the degree of bleaching among the groups. DS was significantly more accentuated in the 48-hour period. The DS was significantly higher for the PL group and significantly lower for the PO group. The desensitizing agents reduced the DS without affecting the effectiveness of the bleaching treatment.
Both desensitizing agents provided greater control over pain compared to the placebo group. Potassium oxalate showed greater pain control than potassium nitrate. Both desensitizing agents tested did not interfere in the degree of whitening.
评估两种脱敏剂在诊室漂白前应用对美白效果和牙本质敏感性的影响。
根据使用的脱敏剂，将参与者随机分配到各组，每组 n=10。漂白使用 35%过氧化氢，根据在漂白程序前使用的脱敏剂进行分配：安慰剂（PL）；含硝酸钾和 0.2%氟化钠的 Desensibilize KF（PN）；含草酸钾的 Oxa-Gel（PO）。在治疗开始时和治疗完成后 1 周，通过比较法借助颜色标尺评估颜色饱和度水平。通过视觉量表，在漂白剂与牙齿接触的整个时间内（5、10、15、20、25 和 30 分钟）以及在漂白剂应用结束后 1、24 和 48 小时，记录受试者的敏感性程度（DS）。在整个研究期间，疼痛和颜色饱和度使用 Shapiro-Wilk 检验进行评估。DS 使用 Kruskal-Wallis 和 Dunn 检验进行评估。颜色使用 ANOVA 和 Tukey 的 HSD 进行评估。
各组之间的漂白效果没有显著差异。DS 在 48 小时期间更为明显。PL 组的 DS 明显更高，PO 组的 DS 明显更低。脱敏剂降低了 DS，而不影响漂白治疗的效果。
与安慰剂组相比，两种脱敏剂都能更好地控制疼痛。草酸钾比硝酸钾更能控制疼痛。两种测试的脱敏剂均未影响美白效果。
