Department of Prosthodontics and Integrated Clinics, College of Dentistry, Ibirapuera University, São Paulo, Brazil.
Braz Oral Res. 2011 Nov-Dec;25(6):562-7. doi: 10.1590/s1806-83242011000600015.
Acid erosion is a superficial loss of enamel caused by chemical processes that do not involve bacteria. Intrinsic and extrinsic factors, such as the presence of acid substances in the oral cavity, may cause a pH reduction, thus potentially increasing acid erosion. The aim of this study was to evaluate the microhardness of bleached and unbleached bovine enamel after immersion in a soda beverage, artificial powder juice and hydrochloric acid. The results obtained for the variables of exposure time, acid solution and substrate condition (bleached or unbleached enamel) were statistically analyzed by the ANOVA and Tukey tests. It was concluded that a decrease in microhardness renders dental structures more susceptible to erosion and mineral loss, and that teeth left unbleached show higher values of microhardness compared to bleached teeth.
酸蚀是一种由非细菌参与的化学过程导致的牙釉质浅表丧失。内在和外在因素，如口腔中酸性物质的存在，可能导致 pH 值降低，从而潜在地增加酸蚀的风险。本研究的目的是评估在苏打饮料、人工粉末果汁和盐酸中浸泡后漂白和未漂白牛牙釉质的显微硬度。通过方差分析和 Tukey 检验对暴露时间、酸溶液和基底条件（漂白或未漂白牙釉质）的变量进行了统计分析。结论是，显微硬度的降低使牙结构更容易受到侵蚀和矿物质损失的影响，并且未漂白的牙齿比漂白的牙齿显示出更高的显微硬度值。
