不同抛光方法对邻面去釉后牙釉质的影响

目的:研究不同抛光方法对离体牙邻面去釉区域釉质脱矿程度的影响.方法:选择20颗离体前磨牙作为实验对象,随机将牙的一个邻面作为对照组,另一邻面作为实验组.对照组邻面去釉后进行物理抛光,实验组邻面去釉后进行化学抛光.所有样本进行体外pH循环60d后,利用激光荧光诊断仪对样本实验区釉质脱矿程度进行定量测定,所得数据采用SPSS10.0软件包进行配对t检验.另选取试样通过扫描电镜观察釉质表面形态结构.结果:对照组釉质脱矿程度较实验组更重,两者差异有高度统计学意义(P＜0.01).扫描电镜观察发现,化学抛光后的釉质表面较物理抛光后更平滑.结论:对邻面去釉后的釉质进行化学抛光较物理抛光可提高釉质表面的光滑程度,降低釉质脱矿的风险.

The effect of different polishing methods on enamel after interproximal enamel reduction

PURPOSE: The aim of this study is to compare the effect of the enamel demineralization degree after interproximal enamel reduction (IER) on extracted teeth with different polishing methods. METHODS: 20 extracted premolars were chosen as samples. In one premolar, a randomized approximal surface was selected as control surface while the other as experimental surface. After IER, the control surface was physically polished and the experimental surface was chemically polished. All samples were treated under the pH cycling experiment for 60 days. Then the enamel demineralization degree was measured with laser fluorescence diagnostic equipment. The data was analyzed by paired t test using SPSS10.0 software package. Some samples were selected to observe the enamel surface morphology through scanning electron microscope (SEM). RESULTS: The enamel demineralization degree of the control group increased significantly than that of the experimental group(P<0.01). SEM images demonstrated that the enamel surface was smoother in the experimental group than the control group. CONCLUSION: Compared with physical polishing,chemical polishing can increase the smooth degree of enamel surface and reduce the risk of enamel demineralization after IER.