磷硅酸钠钙对乳牙釉质再矿化作用的研究

目的：研究生物活性材料磷硅酸钠钙（CSP）对人工脱矿的乳牙釉质表面再矿化的作用。方法：收集30颗健康离体乳磨牙，将每颗牙冠沿近远中径和颊舌径分成4个釉质块，每个釉质块随机分为4组（n ＝30）。样本经35％磷酸酸蚀2 min后分别进行如下处理：空白对照（A 组）、0．14％氟化物处理（B 组）、CSP 处理（C 组）、氟化物＋CSP 处理（D 组），每天循环处理2次。在10、30 d 时扫描电镜观察釉质表面形态并测定釉质表面显微硬度值（SMH）。结果：扫描电镜观察显示，10 d 时A 组表面呈脱矿的蜂窝状表现，B、C 组脱矿不明显，D 组可见明显的矿化物沉积。30 d 时 A 组可见明显釉质脱矿和釉柱溶解表现，B、C 和 D 组可见程度不等的再矿化。10 d 时 D 组的 SMH 值高于 A 组（P ＜0．05），30 d 时 B、C、D 组 SMH 值均高于 A组（P ＜0．05），D 组 SMH 值显著高于 B 和 C 组（P ＜0．05）。结论：CSP 和氟化物具有促进乳牙釉质再矿化的作用，CSP 和氟化物联合应用优于二者的单独应用。

The effects of calcium sodium phosphosilicate on the enamel remineralization of primary teeth

Objective:To study the effect of calcium sodium phosphosilicate(CSP)on the enamel remineralization of primary teeth. Methods:30 extracted human healthy primary molars were collected.Each tooth was cut bucco-lingually and mesial-distally into 4 sections.The sections were assigned randomly into 4 groups(n =30).Demineralization and remineralization cyclic model was estab-lished by etching with 35% phosphate acid for 2 min and then treated by unexposure of the sample to nothing(control,group A),so-dium monofluorophosphat(MFP,group B),CSP(group C)and MFP +CSP(group D).The cyclic was repeated twice daily for 30 d. The enamel surface morphology was observed by SEM and the surface microhardness(SMH)was measured.Results:On the tenth day,squamous morphology was observed on the enamel surface of group A and that of group D appeared less demineralization.The SMH value of group D was significant higher than that of group A(P <0.05).On the thirtieth day,obvious demineralization was ob-served in group A.Group B,C and D appeared surface remineralization.The SMH value of group B,C and D was significant higher than that of group A(P <0.05).Highest SMH value was achieved in group D.Conclusion:CSP combined with fluoride is more ef-fective in the enamel remineralization of primary teeth than the single application of them.