支抗磨牙及支持组织三维光弹应力分析

Stress Analysis of maxillary anchorage molar and its periodentium by three dimensional photoelastic method.

目的 分析中国人上颌第一磨牙在后倾弯作用下,牙及牙周组织的应力分布规律,牙体瞬间旋转中心位置。方法 三维光弹冻结切片法。结果 后倾弯以产生水平推力和近远中向的弯矩为主;同时也产生沿牙长轴的扭矩和冠根向的拉力;牙旋转中心位于三牙根分叉下方附近。结论 支抗磨牙的应力并不仅仅是一种力单独作用的结果,而且是由弯矩、扭矩、推力、压力。

Objective This study was designed to analyse the stress and the instant Center of rotation of maxillary anchorage molar by anchorage bend.Methods three dimensional photoelastic method. Results The main biomechanical effect induced by anchorage bend were push force in horizon plane and bend moment in mesial distal plane, meanwhile rotation moment and pull force in dental Crown root direction found. The Center of rotation located in trifurcation area. Conclusion The stress of anchorage molar and its periodentium was not a singe force but a complex force.