下颌固定义齿不同桥体跨度下受载的三维有限元分析  

A three-dimensional finite element analysis of stress distribution in mandibular FPDs with different length pontics

作　　者：阎黎津[1] 刘洪臣[1] 白露[2] 王延荣[2] 

机构地区：[1]解放军总医院口腔科,北京100853 [2]北京航空航天大学动力系

出　　处：《中华口腔医学杂志》2004年第2期133-135,共3页Chinese Journal of Stomatology

摘　　要：目的　分析当固定义齿桥体加长时修复体及其基牙支持组织的受力状况。方法　在建立下颌固定义齿三维有限元模型的基础上 ,将桥体的跨度分别加至原长的 2～ 4倍 ,施加相同大小的垂直向载荷 ,利用MARC软件计算并绘制各种情况下的应力分布图像。结果　当固定义齿桥体加长时 ,修复体受载后的应力分布情况不发生改变 ,但最大等效应力相应增加。当桥体跨度增加至原长的3倍时 ,最大VonMises应力为 2 11.30MPa(桥体加载 )。结论　桥体的跨度增加超过约 3个前磨牙宽度时 。Objective To investigate the stress distribution in the mandibular fixed partial denture (FPD) by changing the length of pontics. Methods Based on a 3 DFE model of the mandibular FPD, we analyzed the stress distribution in the mandibular FPDs by loading the same level force at pontics with different lengths that were 2 to 4 times of normal length. Results The distribution trends of the stresses in the mandibular FPDs with differently elongated poincs were similar, but the highest von Mises stress in the bridge was enlarged. Conclusion Damages may develop in the mandibular FDP, when the length of the pontic is longer than 3 times of normal length.

关 键 词：下颌 固定义齿 桥体跨度 三维有限元 牙列缺损 

分 类 号：R783.6[医药卫生—口腔医学]