不同浓度过氧化氢脲凝胶漂白剂对人牙釉质显微硬度的体外作用
In vitro action of various carbamide peroxide gel bleaching agents on the micro hardness of human enamel.
作者信息
Sunil Ch R, Sujana V, Choudary T Manisha, Nagesh B
机构信息
Department of Conservative Dentistry, SIBAR Institute of Dental Sciences, Andhra Pradesh, India.
出版信息
Contemp Clin Dent. 2012 Apr;3(2):193-6. doi: 10.4103/0976-237X.96828.
AIMS AND OBJECTIVES
The study was undertaken to evaluate the effects of different carbamide peroxide based gels on micro hardness of enamel exposed to these agents for a period of 8 h daily for a total of 1 week.
MATERIALS AND METHODS
Thirty enamel specimens of 5 × 5-mm dimensions were sectioned from labial surface of maxillary incisor teeth and were embedded in Bakelite. Each block is polished to facilitate micro hardness testing. Pre-bleaching hardness values of 30 samples were measured using Vickers micro hardness tester. After exposing the specimens for different agents for 8 h daily for 1 week, post-exposure micro hardness values were taken and evaluated.
CONCLUSION
With increase in concentration of carbamide peroxide gel from 10% to 16%, mean micro hardness values decreased but to an insignificant level.
目的
本研究旨在评估不同浓度的过氧化脲凝胶，对每天暴露于这些药剂8小时、共持续1周的牙釉质显微硬度的影响。
材料与方法
从拔除的上颌中切牙唇面切取30个5×5毫米的牙釉质样本，包埋于酚醛树脂中。每个样本块经抛光后，便于进行显微硬度测试。使用维氏显微硬度计测量30个样本漂白前的硬度值。将样本每天暴露于不同药剂8小时，持续1周后，测量并评估暴露后的显微硬度值。
结论
随着过氧化脲凝胶浓度从10%增加到16%，平均显微硬度值下降，但下降幅度不显著。
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