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中华口腔医学研究杂志(电子版) ›› 2011, Vol. 5 ›› Issue (01) : 19 -25. doi: 10.3877/cma.j.issn.1674-1366.2011.01.004

基础研究

唾液对牙釉质酸蚀保护作用的体外实验研究
王萍1, 林焕彩2,()   
  1. 1.510630 广州,中山大学附属第三医院口腔科
    2.510630 广州,中山大学光华口腔医学院·附属口腔医院·口腔医学研究所
  • 收稿日期:2010-05-10 出版日期:2011-02-01
  • 通信作者: 林焕彩

An in vitro study of the salivary protective effect on dental erosion

Ping WANG1, Huan-cai LIN1,()   

  1. 1.Department of Stomatology, the Third Affiliated Hospital, Sun Yat-sen University,Guangzhou 510630, China
  • Received:2010-05-10 Published:2011-02-01
  • Corresponding author: Huan-cai LIN
引用本文:

王萍, 林焕彩. 唾液对牙釉质酸蚀保护作用的体外实验研究[J/OL]. 中华口腔医学研究杂志(电子版), 2011, 5(01): 19-25.

Ping WANG, Huan-cai LIN. An in vitro study of the salivary protective effect on dental erosion[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2011, 5(01): 19-25.

目的

研究酸蚀症儿童唾液和无酸蚀症儿童唾液对牙釉质酸蚀的保护作用及程度。

方法

收集5 名患酸蚀症男童和5 名无酸蚀症男童非刺激性唾液各10 ml。 收集因正畸需要而新鲜拔除的健康青少年前磨牙15 个,制备牙釉质块30 个,随机分成酸蚀症唾液组、无酸蚀症唾液组和去离子水组3 组。 釉质样本分别浸泡在唾液和去离子水内,每天2 次用0.3%的枸橼酸溶液酸蚀5 min,10 d 循环结束后,用原子力显微镜观察釉质表面粗糙度以及显微硬度计进行釉质硬度测量。

结果

去离子水组的釉质样本表面粗糙度大于两个唾液组釉质样本,显微硬度值小于两个唾液组的釉质样本(P<0.001)。 酸蚀症唾液组和无酸蚀症唾液组釉质样本的表面粗糙度值和显微硬度值间差异均无统计学意义(P=0.695,P=0.432)。

结论

唾液对牙釉质酸蚀起到保护作用,有无患酸蚀症的儿童唾液对牙釉质的保护作用无差异。

Objective

To explore the protective effect of salivary on dental enamel against citric acidic erosion between children with and without dental erosion.

Methods

Ten ml of unstimulated whole saliva were collected from 5 boys with dental erosion and 5 boys without dental erosion. Fifteen extracted premolars of adolescent were collected and 30 enamel slices were prepared. The enamel specimens were divided randomly into 3 groups: control group (deionized water), salivary group of children with dental erosion, and salivary group of children without dental erosion. The enamel specimens were immersed into the agents respectively for 10 days and exposed to 0.3% critic acid 5 min twice a day. The surface roughness of all enamel specimens was imaged using an atomic force microscopy and the surface microhardness of enamel was measured using a microhardness tester.

Results

The value of surface roughness of the control group was significantly higher than the two salivary groups, while the value of microhardness of the control group was significantly lower than the two salivary groups (P<0.001). No significant difference was found between erosion salivary group and non-erosion salivary group (P=0.695, P=0.432).

Conclusions

Saliva can protect the enamel against acidic erosion. However, there was no statistically significant difference in protective effect of salivary between children with or without dental erosion.

图1 实验前牙釉质表面形态、三维成像图及表面粗糙度测量 A:二维图像可见抛光时留下的微小划痕; B:三维成像图可见划痕表浅,由于玷污层存在,未见釉柱结构
表1 实验前后牙釉质样本表面粗糙度均值的比较(±s,n=10)
图2 去离子水组牙釉质表面形态、三维成像图及表面粗糙度测量 箭头所示可见釉柱中心轻度凹陷结构(黑箭头),柱间质破坏,柱间隔较宽(白箭头)
图3 酸蚀症唾液组可见釉柱和柱间质破坏不均匀
图4 酸蚀症唾液组大部分釉质表面残留覆盖唾液获得性膜
图5 无酸蚀症唾液组可见釉柱和柱间质破坏不均匀,釉柱中心未见明显的凹陷结构
图6 无酸蚀症唾液组大部分可见表面残留的获得性膜,多数呈多孔结构
表2 实验前后牙釉质样本显微硬度均值的比较(±s,n=10)
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