不同临床设计的ERA附着体义齿修复下颌牙列游离端缺损的三维有限元分析  

Influence of clinic design of the prostheses with ERA attachment for distal extension defect:A three-dimensional finite element analysis

作　　者：李晓娜 刘洋 Hong Guan LI Xiaona LIU Yang Hong Guanz.(116021, Department of Special Clinic Depatment of Prosthodontics, Dalian Stomatological Hospital, China 4222 Queensland, School of Engineering, Griffith University, Gold Coast Campus, Australia)

机构地区：[1]大连市口腔医院特诊科,116021 [2]大连市口腔医院口腔修复科,116021 [3]School of Engineering,Griffith University,Gold Coast Campus

出　　处：《实用口腔医学杂志》2017年第1期95-99,共5页Journal of Practical Stomatology

摘　　要：目的:研究3种不同临床设计ERA附着体义齿修复下颌远中游离端缺损的应力及位移分布。方法:建立ERA附着体义齿修复下颌远中游离端缺损的三维有限元模型,根据临床设计分为基本组、支托组和跨弓组。应用有限元法研究在垂直及45°斜向2种载荷方向100 N的作用下,基牙及基托下黏膜的应力和位移以及基托的位移情况。结果:2种载荷下3组模型均在远中基牙远中邻面肩台出现应力集中,远中基牙预备体咬合面位移最大,支托组基牙位移最大,分别为14.91μm和63.09μ.m,其次为基本组(9.38μm和50.56μm),跨弓组最小(8.85μm和47.31μm)。结论:在本研究条件下,为远中游离端牙列缺损设计基本的ERA附着体义齿更趋于合理。[ Abstract] Objective： To evaluate the stress distribution and displacement pattern in the restoration of Stern-ERA attachment mandi- ble removable partial denture （RPD） with different designs through three-dimensional （3D） finite element （FE） analysis. Methods： 3D-FE models were established based on human CT data End manufaeturer~ catalog. Vertical and 45~ lingual oblique forces of 100 N were applied on the artificial teeth of the RPD. Three ERA attachment partial dentures with different bracing arms were designed, name- ly the basic design, rest bracing arm design and cross-arch bracing arm design. The von Mises stresses and displacements of abutment teeth and mucosa under denture base were analysed. The displacement of denture bases was examined. Results： Under the vertical and oblique loading, the maximum yon Mises stress was found at the distal shoulder on the distal abutment. The maximum displacement was observed at the buccal and distal occlusal surfaces of the distal abutment. The maximum displacement on the abutment was found to be the highest in rest bracing arm design group （14.91 Ixm and 63.09 ixm）, followed by the basic design group （9.38 p^m and 50.56 Ixm） and the cross-arch bracing arm design group exhibited the smallest displacement （8.85 Ixm and 47.31 ~m）. Conclusion： The basic design Stern_ERA attachment for unilateral mandible distal extension defect appears to be more reasonable compared with rest arm and crossing-arch arm design from biomechanical point of view.

关 键 词：有限元分析(FE) 局部义齿 ERA附着体 应力 

分 类 号：R783.6[医药卫生—口腔医学]