两种不同精密附着体义齿的应力分析

Force system intruding of two different procession attachment dentures

目的探讨按扣式和键槽缓压式两种精密附着体修复下颌磨牙游离缺失的应力分布情况。方法采用三维有限元分析法。结果在单侧磨牙加轴向力200 N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200 N时,无论在舌侧,还是在唇侧,对另外两基牙的影响显著减小。与在单侧磨牙施加轴向力200 N时相比,在双侧磨牙同时施加轴向力时,基牙和下颌骨的应力稍稍增大。结论①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。②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。

Objective To explore the force system of different precision attachments in mandible distal-extension edentalous by a finite-element model. Methods The three-dimensional finite element stress analysis method was used. Results Tne effects of attachments of ASC-52 were reduced in abutment when the molar was forced by 200 N. When the molar was forced by 200 N, the effection of the attachment ASC-52 was much more reduced than the attachment of the revax system. When the premolar was forced by 200 N, the effection on attachments was reduced either liable or lingual. When the double molars were forced by 200 N, the stress intruding was added in mandibles and abutnrents. The labial effection of abutments is smaller than hngual in the attachment of the revax system or A^52. The effection of the ASC-52 attachment is reduced in the abutment when the molars are forced.