Pinto Cristiane Franco, Oliveira Rogério de, Cavalli Vanessa, Giannini Marcelo
Department of Restorative Dentistry, School of Dentistry of Piracicaba, State University of Campinas.
Braz Oral Res. 2004 Oct-Dec;18(4):306-11. doi: 10.1590/s1806-83242004000400006.
The aim of this study was to evaluate the surface roughness, microhardness and morphology of human enamel exposed to six bleaching agents (at baseline and post-treatment). Human dental enamel samples were obtained from human third molars and randomly divided into seven groups (n = 11): control, Whiteness Perfect--10% carbamide peroxide (10% CP), Colgate Platinum--10% CP, Day White 2Z--7.5% hydrogen peroxide (7.5% HP), Whiteness Super--3% CP, Opalescence Quick--35% CP and Whiteness HP--35% HP. Bleaching agents were applied according to manufacturers' instructions. The control group remained not treated and stored in artificial saliva. Microhardness testing was performed with a Knoop indentor and surface roughness was analyzed with a profilometer. Morphologic observations were carried out with scanning electron microscopy (SEM). Results were statistically analyzed by two-way analysis of variance and Tukey's test (5%), and revealed a significant decrease in microhardness values and a significant increase in surface roughness post-bleaching. Changes in enamel morphology after bleaching were observed under SEM. It was concluded that bleaching agents can alter the microhardness, roughness and morphology of dental enamel surface.
本研究的目的是评估暴露于六种漂白剂（基线和治疗后）的人类牙釉质的表面粗糙度、显微硬度和形态。人类牙釉质样本取自人类第三磨牙，并随机分为七组（n = 11）：对照组、佳洁士美白牙贴——10%过氧化脲（10% CP）、高露洁铂净炫——10% CP、皓齿美白2Z——7.5%过氧化氢（7.5% HP）、超白——3% CP、欧乐-B极致速白——35% CP和美白HP——35% HP。按照制造商的说明使用漂白剂。对照组未进行处理，保存在人工唾液中。使用努氏压头进行显微硬度测试，并用轮廓仪分析表面粗糙度。用扫描电子显微镜（SEM）进行形态学观察。结果采用双向方差分析和Tukey检验（5%）进行统计学分析，结果显示漂白后显微硬度值显著降低，表面粗糙度显著增加。在SEM下观察到漂白后牙釉质形态的变化。得出的结论是，漂白剂会改变牙釉质表面的显微硬度、粗糙度和形态。
