应用激光全息-散斑技术测量桥基牙旋转角度

The application of laser holograph-speckle interferometry for measuring rotation of abutment teeth

目的通过激光全息-散斑技术,研究双端固定桥桥基牙在咬合时产生的旋转角度及其对桥基牙稳定性的影响。方法对缺失的下颌骨进行固定桥修复。采用激光全息-散斑技术测量分布载荷和集中载荷下桥基牙的旋转角度。结果加载量为9.8～225.4 N 时最大旋转角不超过0.6°,角度变化与加载量无线性关系。结论运用激光全息-散斑技术可测量桥基牙的旋转角度,表面多点接触是导致旋转的主要原因,旋转不影响该类双端固定桥修复患者的日常使用。

Objective To explore the rotation of abutment teeth of fixed partial denture in chewing and to analyze the effect of rotation on the stability of abutment teeth. Methods Left mandible （ without the second premolar and the first molar） was used for specimen. Holograph-speckle interferometry was employed for measuring the rotation angle. Results The maximal rotation angle was no more than 0. 6° and change of the angle was obviously in nonlinearity, when load increased from 9. 8 N to 225.4 N. Conclusions The laser holograph-speckle interferometry could be used to measure rotation of abutment teeth. The intricate surface contacting was the main reason for rotation and this rotation bad no bad effect on abutment teeth of fixed partial denture in daily use.