应用电子散斑干涉术对下颌单侧游离缺失修复体受载的实验研究

Electronic speckle pattern interferometric analysis on force distribution of different mandibular unilateral free end dentures

目的对下颌单侧游离缺失后三种不同修复体的运动及其受力状态进行试验性研究。方法首次采用电子散斑干涉术（ｅｌｅｃｔｒｏｎｉｃｓｐｅｃｋｌｅｐａｔｅｒｎｉｎｔｅｒｆｅｒｏｍｅｔｒｙ）对单端固定桥、铸造三臂卡环及ＲＰＩ卡环的可摘局部义齿进行垂直加载测试，观察显示的实时散斑干涉条纹图并测量相应各截面牙槽骨的离面位移（ｏｕｔｏｆｐｌａｎｅｄｉｓｐｌａｃｅｍｅｎｔ）。结果表明三种修复体修复后均有利于应力的传递，相应截面牙槽骨的离面位移减少。其中单端固定桥修复后相应牙槽骨的离面位移量最小，ＲＰＩ卡环较三臂卡环可摘局部义齿修复后相应牙槽骨的离面位移量稍大。结论电子散斑干涉术特别适用于测量小而不规则牙槽骨表面的变形情况。合理选择适应证，单端固定桥是一种良好的修复方式。

Objective To study the force distribution of three kinds of mandibular unilateral free end partial denture under vertical loading on the artificial tooth.Methods A fresh mandible with right 2nd and 3rd molars missing was restored with cantilever fixed partial denture (CFD), casting three arm clasp removable partial denture (CCD) and RPI removable partial denture (RPID) respectively. The force distribution on the surface of supporting bone was studied by using electronic speckle pattern interferometry (ESPI). The ESIP was displayed real time and recorded. The fringes determining was prossed by microcomputer image processing. The corresponding out of plane displacement of the supporting bone was measured and analyzed.Results Showed all of the three kinds of dentures contribute to transmit stress to supporting bone. The corresponding out of plane displacement of supporting bone decreased, the degree of decrease was CFD<CCD<RPID in order.Conclusion This finding provides a useful reference for design of denture construction