The influence of two home-applied bleaching agents on enamel microhardness:: An in situ study
The influence of two home-applied bleaching agents on enamel microhardness:: An in situ study
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DOI：
10.1016/j.jdent.2007.09.011
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发表时间：
2008-01-01
影响因子：
4.4
通讯作者：
Cardoso Vieira, Luiz Clovis
中科院分区：
文献类型：
--
作者：
Maia, Elaine;Baratieri, Luiz Narciso;Cardoso Vieira, Luiz Clovis
目的：本原位研究评价了两种自制漂白剂（10%过氧化脲和7.5%过氧化氢）对釉质显微硬度的影响。方法：从人第三磨牙获得90个釉质板，并在50 g负荷5 s下记录基线努氏硬度测量值。将样本连接到递送给10名志愿者（牙齿供体）的口内装置上，志愿者在整个实验期间每天24小时使用该装置。标本分为三组，两个实验组和一个对照组;在最后一组中，釉质板不提交漂白剂，但只暴露于唾液的作用。为每个志愿者制作了两个定制的托盘，以恢复牙齿和含有釉质板的器具。漂白方案为1小时/天，连续21天。随后，额外的硬度测量recorded.Results：基线和最终显微硬度的平均值分别为：348和352.2; 346.6和354.5; 342和340.8，为对照组，10%过氧化脲和7.5%过氧化氢组，分别。显微硬度平均值的单因素方差分析显示各组之间无统计学显著差异，用7.5%过氧化氢处理的标本显示出显微硬度降低的趋势（p = 0.056）。结论：数据表明，测试的家庭漂白剂没有改变表面釉质显微硬度。(c)2007爱思唯尔有限公司版权所有。
Objective: This in situ study evaluated the influence of two home-applied bleaching agents (10% carbamide peroxide and 7.5% hydrogen peroxide) on enamel microhardness.Methods: Ninety enamel slabs were obtained from human third molars and baseline Knoop hardness measurements were recorded under a 50 g load for 5s. The specimens were attached to intra-oral devices delivered to 10 volunteers (donor of the teeth) who used the devices 24 h/day throughout the experiment. The specimens were divided in three groups, two experimental and one control; in the last group, enamel slabs were not submitted to bleaching agents, but exposed only to the action of saliva. Two custom-made trays were made for each volunteer to recover the teeth and the appliances containing the enamel slabs. The bleaching regimen was 1 h/day for 21 consecutive days. Subsequently, additional hardness measurements were recorded.Results: The mean values of the baseline and final microhardness were: 348 and 352.2; 346.6 and 354.5; 342 and 340.8, for control, 10% carbamide peroxide and 7.5% hydrogen peroxide groups, respectively. One-way ANOVA of the microhardness mean values revealed no statistically significant differences among groups, the specimens treated with 7.5% hydrogen peroxide has shown a tendency (p = 0.056) to microhardness decrease.Conclusions: Data suggested that the tested home bleaching agents did not change the superficial enamel microhardness. (c) 2007 Elsevier Ltd. All rights reserved.