冠外弹性附着体义齿修复游离端缺牙的有限元分析  

Finite element analysis of extracoronal resilient attachment prosthesis in distal extension situation

作　　者：王慧媛 陈吉华 张玉梅 艾林[2] 

机构地区：[1]第四军医大学口腔医院修复科,西安710032 [2]解放军第451医院口腔科

出　　处：《实用口腔医学杂志》2011年第4期512-517,共6页Journal of Practical Stomatology

基　　金："十一五"国家科技支撑计划重点项目课题(编号:2007BAI18B05)

摘　　要：目的:观察冠外弹性附着体(extracoronal resilient attachment,ERA)运动的力学特点及其对游离端义齿支持组织的影响。方法:建立ERA附着体义齿修复牙列游离端缺损的有限元建模,观察在相同的附着体结构下,阴阳极之间的连接方式和载荷因素对义齿支持组织EQV应力(equivalent stress)的影响。结果:附着体刚性与弹性连接方式下的应力分布规律相同,但颊舌向载荷下,弹性组的基牙牙周组织应力较刚性组小,而缺牙区牙槽嵴远中区域的应力较大(P<0.05)。弹性组中的附着体在颊舌向载荷下的转动达到最大值。结论:ERA附着体通过义齿基托部分的旋转和下沉运动,使部分力转移至缺牙区牙槽嵴的远中区域;其在侧运动中的缓冲作用优势明显。Objective： To study the biomechanical characteristics and the effects of extracoronal resilient attachment（ERA） denture on supporting tissues for distal extension prosthesis.Methods： Finite element models were constructed with the same ERA attachment structure,and equivalent（EQV） stress of component connection and loading on supporting tissues were observed.Results： Stress distribution in the rigid and nonrigid group was similar but stress of nonrigid group was lower in periodontal tissue than that of the rigid group from buccolingual loading,and higher in edentulous alveolar ridge（P0.05）.In resilient connection,denture movement showed the most displacement under buccolingual loading.Conclusion： An extracoronal resilient attachment may reduce the stress on the terminal abutment by allocating more loads to the distal area of edentulous ridge,probably because of attachment rotation and vertical movement.The effect was most obvious in lateral loading.

关 键 词：有限元分析 游离端义齿 ERA附着体 

分 类 号：R783.6[医药卫生—口腔医学]