不同乳制（饮）品对离体乳牙牙釉质脱矿作用的比较研究

目的：比较3种市售乳制（饮）品对离体乳牙牙釉质的脱矿作用，为儿童合理选择饮用乳制（饮）品提供依据。方法将离体乳牙浸泡在奶粉液（奶粉液组）、酸奶（酸奶组）、果汁型乳饮品（果汁型乳饮品组）、蒸馏水（蒸馏水组）等乳制（饮）品中1周，用扫描电镜观察并比较经不同乳制（饮）品浸泡后乳牙牙釉质表面超微结构的改变；用维氏显微硬度仪测定并比较乳牙牙釉质表面显微硬度的变化。结果3种乳制（饮）品均可导致离体乳牙牙釉质表面显微硬度下降（P＜0.05）。不同乳制（饮）品对离体乳牙牙釉质脱矿作用程度不同（F=20.14，P<0.05），果汁型乳饮品浸泡后的乳牙（果汁型乳饮品组）牙釉质表面显微硬度最低，其次是奶粉液组和酸奶组。离体乳牙经3种不同乳制（饮）品浸泡1周后，其釉质表面均有不同程度脱矿现象，扫描电镜下观察可见釉质表面形态不规则，釉柱出现裂纹、空洞等溶解脱矿现象，局部可见蜂窝状或深坑样外观。结论各种乳制（饮）品均可导致乳牙牙釉质不同程度的脱矿，其中果汁型乳饮品脱矿较为严重。

Comparative study of enamel demineralization of different dairy (drink) goods on the primary teeth in vitro

Objective To compare the enamel demineralization effect of different dairy (drink) goods for providing evidence for choosing children dairy (drink) products. Methods Immerse in vitro deciduous teeth in different dairy (drink) goods (milk powder solution group;yogurt group;fruit juice milk drinks group;distilled water group) for a week, the enamel surface ultrastructure in deciduous teeth immersed in different dairy (drink) were observed and compared by scanning electron microscope. Results Three kinds of dairy products (drink) can lead to deciduous teeth enamel surface microhardness decreased (P < 0.05). Different dairy products (drink) on isolated teeth enamel demineralization degree (F=20.14, P<0.05), juice milk drinks after immersion of the enamel surface microhardness of the lowest, followed by milk powder solution group and yogurt group. Deciduous teeth with three different dairy (drink) after 1 weeks of immer-sion, the enamel surface had different degree of demineralization phenomenon, observation showed irregular enamel sur-face morphology under scanning electron microscope, the phenomena of dissolution and removal of cracks, voids and so on, partial visible appearance or honeycomb pit. Conclusion Dairy (drink) product all can lead to a variety of deciduous teeth enamel demineralization of different level fruit juice milk drinks can cause serious demineralization.