do Carmo Públio Juliana, D'Arce Maria B F, Ambrosano Gláucia M B, Aguiar Flávio H B, Lovadino José R, Paulillo Luís A M S, Lima Débora A N L
Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas - UNiCAMP, Piracicaba, São Paulo, Brazil.
J Investig Clin Dent. 2015 May;6(2):133-40. doi: 10.1111/jicd.12074. Epub 2013 Dec 20.
In the present study, we evaluated the efficacy of bleaching on enamel and opposite dentin surfaces using 35% hydrogen peroxide (HP) with the prior application of a desensitizing agent.
Thirty bovine dental fragments, with thicknesses of 1 mm enamel and 1.75 mm dentin, were stained in a solution of black tea. The fragments were randomly divided into three groups (n = 10) according to the following protocols: (a) 2% neutral fluoride + bleaching; (b) desensitizing agent + bleaching; and (c) without desensitizer + bleaching. The bleaching efficacy was evaluated four times: after staining with tea (baseline) and after each of the 3 weeks of bleaching, by means of the CIE Lab method using a reflectance spectrophotometer. The data coordinate L* was evaluated by an analysis of repeated measures with PROC MIXED and Tukey-Kramer's test. The ΔE values were subjected to anova and Tukey's test (α = 0.05).
The 35% HP treatment showed greater efficacy on deep dentin after removal of the enamel stains, with increasing means during all times in all treatments.
The use of a desensitizing agent prior to the bleaching session did not affect the mechanism of action of 35% HP with regard to tooth depth.
在本研究中，我们评估了在预先使用脱敏剂的情况下，使用35%过氧化氢（HP）对牙釉质和相对的牙本质表面进行漂白的效果。
将30个牛牙碎片（牙釉质厚度为1毫米，牙本质厚度为1.75毫米）在红茶溶液中染色。根据以下方案将碎片随机分为三组（n = 10）：（a）2%中性氟化物+漂白；（b）脱敏剂+漂白；（c）不使用脱敏剂+漂白。通过使用反射分光光度计的CIE Lab方法，在茶染色后（基线）以及漂白的3周中的每一周后，对漂白效果进行了四次评估。使用PROC MIXED和Tukey-Kramer检验通过重复测量分析来评估数据坐标L*。对ΔE值进行方差分析和Tukey检验（α = 0.05）。
在去除牙釉质污渍后，35% HP处理对深层牙本质显示出更大的效果，在所有处理的所有时间内平均值都在增加。
在漂白疗程之前使用脱敏剂不会影响35% HP对牙齿深度的作用机制。
