不同牙根长度对双套冠覆盖义齿基牙受力的影响  

The influence of different root length on stress distribution in the bone around abutment root of telescopic overdenture

作　　者：潘韶霞[1] 冯海兰[1] 尹亚梅[1] 

机构地区：[1]北京医科大学口腔医学院修复科,100081

出　　处：《中华口腔医学杂志》2000年第1期67-68,I007,共3页Chinese Journal of Stomatology

基　　金：国家教委博士点项目基金!(9501016)

摘　　要：目的　分析下颌双套冠覆盖义齿牙槽骨吸收程度不同对其应力分布的影响。方法　用三维有限元法 ,分析牙根长度不同时基牙的应力分布。结果　随着牙根周围牙槽骨高度下降 ,基牙根周骨内最大压应力值增加 ,应力集中范围增大 ;但在牙槽骨吸收至根尖 1/ 3的范围内 ,应力值均小于正常情况下牙周膜可耐受的最大压应力值。结论　下颌根周牙槽骨吸收至根尖 1/ 3(根长约 4～ 5mm)的尖牙 ,在行截冠术和完善的牙体治疗后 ,如能保持合理的冠根比 。Objective To investigate the influence of bone height around the roots on stress distribution in a mandible with two canines remained and covered with an telescopic overdenture. Methods Three dimensional finite element method. Results As the height of the bone around the roots decreased, the stress increased. But the maximum stress in the bone in this study is lower than that in the bone around the canine under normal condition. Conclusion In the mandible, when the alveolar bone resorption reaches the apical 1/3 of canine (root length 4,5 mm), if part of the tooth crown was removed, to make an acceptable crown/root ratio, so the canine can be used as the abutment of an overdenture.

关 键 词：覆盖义齿 双套冠 三维有限元法 义齿 

分 类 号：R783.6[医药卫生—口腔医学]