杆卡附着体下颌种植覆盖义齿牙槽骨的三维光弹应力分析  

Three-dimensional photoelastic analysis of edentulous alveolar bone supported with bar-clip retained mandibular implant-supported overdentures

作　　者：佘文珺[1] 张青青[2] 谢俊良[1] 刘韫嘉 焦婷[1] 

机构地区：[1]上海交通大学医学院附属第九人民医院口腔修复科.上海市口腔医学重点实验室,上海200011 [2]上海浦东新区人民医院口腔科,上海201200

出　　处：《临床口腔医学杂志》2015年第4期209-212,共4页Journal of Clinical Stomatology

基　　金：上海市科学技术委员会资助(08DZ2271100);上海市重点学科建设项目(S30206);上海市重点(特色)学科建设项目资助(T0202);上海市卫生局局级课题资助(2011120)

摘　　要：目的:研究杆卡附着体下颌种植覆盖义齿在各种咬合状态时下颌牙槽骨的应力分布。方法:制作杆卡附着体下颌种植覆盖义齿光弹模型,采用三维冷冻光弹法分析正中、前伸、侧向咬合状态下种植体周围与余留牙槽嵴的应力。结果:三种咬合状态下,种植体颈部和尖周牙槽骨应力值较大,尖周应力值大于颈部应力值;余留牙槽嵴最大应力值出现在磨牙区。侧向牙合工作侧各牙位切片的最大应力值出现于唇颊侧,平衡侧各牙位切片的最大应力值出现于舌侧;前伸牙合侧切牙区唇侧应力最大,中线区及后牙区应力最大值出现于舌侧。结论:杆卡式种植覆盖义齿在正中、前伸、侧向咬合状态下,种植体周围骨组织应力值较大,不利于种植体的健康,因此应用杆卡式附着体时,可考虑增加种植体,扩大基托面积,依据平衡牙合排牙以分散牙合力。Objective：To study stress distribution of mandible under implant-retained overdenture with bar-clip at-tachment. Method：Photoelastic models of epoxy were fabricated .Force was applied in conditions of centric , lateral and protrusive occlusion. Stress distribution of mandible was studied with three-dimensional photoelastic analysis. Result：In these three occlusions stress was concentrated around the cervical and apical alveolar of implants ,and the stress around the apical part was higher. Moreover maximum stress of residual alveolar ridge was observed on the molar area. In lateral occlu-sion the stress was focused on the buccal alveolar for working side and on the lingual side for balanced side. In protrusive occlusion the stress was focused on the lingual side of middle incisor and molars ,but the buccal side of lateral incisor. Conclusion：It is not benefit for the implant of implant-retained overdenture with bar-clip attachment that stress was fo-cused around the cervical and apical alveolar of implants in centric,lateral and protrusive occlusion. For disperse bite force, we should increase implants ,extend denture base and arrange artificial teeth according balanced occlusion theory.

关 键 词：杆卡附着体 种植覆盖全口义齿 三维光弹应力分析 

分 类 号：R783.6[医药卫生—口腔医学]