两种不同精密附着体义齿单侧载荷的应力研究

目的：研究按扣式和键槽缓压式2种不同的精密附着体修复下颌磨牙游离缺失的应力分布情况。方法：用螺旋CT机对下颌双侧后牙游离缺失的成年健康女性志愿者进行下颌骨扫描，建立下颌骨和附着体系统的三维有限元模型。采用三维有限元分析法分析。结果：在单侧磨牙加轴向力200N时，键槽缓压式精密附着体比按扣式精密附着体对基牙的影响显著减低。在单侧双尖牙加轴向力200N时，无论在舌侧还是在唇侧，对另外两基牙的影响显著减小。结论：无论是按扣式精密附着体还是键槽缓压式精密附着体，无论在磨牙还是在双尖牙施加轴向力，对基牙颊侧的影响比对舌侧的影响小。当在磨牙施加轴向力时，键槽缓压式精密附着体对基牙的影响显著减低，铰链可以起到非常好的缓冲保护效果。

The study of force system intruding of two different precision attachment denture in unilateral load of stress

Objective:To analyze the force system of different precision attachment in mandible distal-extension edentulous by the finite-element model.Methods:With spiral CT machine scanning,three-dimensional finite element model of the mandible with bilateral distal-extension edentulous of adult female volunteers and attachment system were established.stress analysis was then performed.Results:The effects of the attachment of ASC-52 reduced in abutment when the molar was forced 200N.when the molar was forced 200N,the effect of the attachment ASC-52 reduced than revax system.when the premolar was forced 200N,the effect on attachment reduce either liable or lingual.When the double molars were forced 200N,the stress intruding is added in mandible and abutment.Conclusions:The labial effect of abutment is smaller than lingual in the attachment of revax system and the attachment of ASC-52.The affection of the attachment of ASC-52 reduce in the abutment when the molars are forced.