美白凝胶及酸性饮料对离体牙釉质结构的影响

目的:观察漂白剂对牙齿脱矿的作用.方法:分别用Beyond美白胶贴片、可乐、橙汁在人工唾液中浸泡离体牙,经过即刻,7天,14天后分别用扫描电镜观察分析表面形貌和Ca/P含量变化,显微硬度仪检测釉质改变.结果:处理后3组样品的即刻Ca/P比值和平均显微硬度均降低,且明显小于对照组(P＜0.05);7天后逐渐提高,14天后与对照组差异无统计学意义(P＞0.05).橙汁组的Ca/P比值和平均显微硬度在处理后即刻处理组内对比中略小于漂白和可乐组.结论:漂白剂对人牙釉质有一过性脱矿作用,随着时间推移,釉质可再矿化而修复；漂白剂引起的脱矿与日常饮用的酸性饮料比较属于正常脱矿范围.

Effects of tooth whitening gel and carbonated beverages on surface Properties of dental enamel

Objective： To compare enamel surface morphology, Ca/P content and hardness changes caused by teeth bleaching clip, cola and orange juice through an in vitro study. Method： Sixty teeth were soaked in toothbleaching glue, cola, orange juice, and physiological saline （served as control group）, followed by measurement of enamel surface morphol- ogy, Ca/P content and hardness changes immediately, after 7 days and 14 days respectively. Results： The Ca/P ratio and the average microhardness of all test groups were significantly less than the control group （P〈0.05） after treatment immedi- ately, and no significant difference was observed （P〉 0.05） after 14 days. Ca/P ratio and the average microhardness in or- ange juice group was less than those in bleaching group and cola group. Conclusion： Bleaching agents showed a transient demineralization on human enamel, however, remineralization and repairation would happened with the time goes on. Demineralization caused by bleaching showed relatively normal compared with acidic drinks and daily drinking, even less than orange juice, suggesting that bleaching treatment should avoid drinking orange juice and other acidic beverages to avoid further enamel demineralization.