Effect of different peroxide bleaching regimens and subsequent fluoridation on the hardness of human enamel and dentin
Effect of different peroxide bleaching regimens and subsequent fluoridation on the hardness of human enamel and dentin
复制标题
DOI：
10.1016/j.prosdent.2004.07.019
复制
发表时间：
2004-10-01
影响因子：
4.6
通讯作者：
Cardash, H
中科院分区：
文献类型：
--
作者：
Lewinstein, I;Fuhrer, N;Cardash, H
问题陈述。通过“办公室”或“家庭”漂白技术漂白牙齿是美白牙齿的流行方法。然而，漂白可能会降低牙釉质和牙本质的表面硬度。本研究的目的是评估（1）不同浓度的2种“办公室漂白”和2种“家庭漂白”剂应用不同时间段对牙釉质和牙本质硬度的影响，以及（2）随后浸入低浓度氟化物溶液对漂白牙釉质和牙本质硬度的影响。取12颗离体人磨牙的牙釉质和牙本质，经纵向切片、研磨、抛光、树脂包埋后，分为4组，每组12颗。在100 g载荷下，对约5 x 5 mm的牙釉质和牙本质区域进行努普硬度值（KHN; kg/mm（2））测试，持续20秒（基线）。将试样在蒸馏水中储存1小时，并作为对照组重复进行显微硬度测试。各组漂白如下：OX组和OQ组分别用Opalescence Xtra（35%过氧化氢）和Opalescence Quick（35%过氧化脲）“在办公室”漂白5、15或35分钟，并在每个时间段结束时重新检测KHN。将“家庭漂白”产品Opalescence F（15%过氧化脲）和Opalescence（10%过氧化脲）以24小时间隔分别施用至组OF和O，14小时施用，然后测试其KHN。将样本浸入0.05%氟化物溶液（Meridol）中5分钟，并重新检测KHN。通过双因素ANOVA和Scheffe事后检验（α = 0.05）分析硬度值。比较各组KHN与基线测量值之间的差异。所有试验组的牙釉质和牙本质的KHN在漂白后均显著降低，这取决于累积的漂白时间。OX组在漂白35分钟后，牙釉质和牙本质的KHN分别减少了25%和22%（P
Statement of problem. Bleaching of teeth by "in-office" or "home" bleaching techniques arc popular methods of whitening teeth. However, bleaching may reduce the surface hardness of enamel and dentin.Purpose. The Purpose of this study was to evaluate (1) the effect of different concentrations of 2 "in-office bleaching" and 2 "home bleaching" agents applied for different time periods on the hardness of enamel and dentin and (2) the effect Of Subsequent immersion in a low-concentration fluoride Solution on the hardness of bleached enamel and dentin.Material and methods. The enamel and dentin of 12 extracted intact human molar teeth were sectioned lengthwise, ground, polished, embedded in acrylic resin and divided into 4 groups each (n=12). An area of approximately 5 x 5 mm of enamel and dentin tested for Knoop hardness number (KHN; kg/mm(2)) at a load of 100 g for 20 seconds (baseline). The specimens were stored in distilled water for I hour and the microhardness testing repeated as a control group. The groups were bleached as follows: Group OX and Group OQ were bleached "in office" with Opalescence Xtra (35% hydrogen peroxide) and Opalescence Quick (35% carbamide peroxide), respectively, for 5, 15, or 35 minutes and retested for KHN at the end of each time period. "Home bleaching" products Opalescence F (15% carbamide peroxide) and Opalescence (10% carbamide peroxide) were applied in 14-hour applications at 24-hour intervals to Groups OF and O, respectively, which were then tested for KHN. Specimens were immersed in 0.05% fluoride Solution (Meridol) for 5 minutes and retested for KHN. The hardness values were analyzed by 2-way ANOVA and Scheffe post hoc test (alpha=.05). Comparisons of KHN between each time and the baseline measurement for each group were of interest.Results. Significant decreases in KHN of enamel and dentin were found after bleaching for all test groups, dependent on the accumulated bleaching time. Group OX showed a 25% KHN reduction for enamel and 22% for dentin after 35 minutes bleaching (P