Stress analysis of distal-extension prosthetics with mesial and distal occlusal rest
- VernacularTitle:近远中(牙合)支托对末端游离缺失修复应力分布的影响
- Author:
Wenzhong JIN
;
Qingfeng HUANG
;
Bin WEI
;
Fuqiang ZHANG
;
Wen CUI
;
Chengtao WANG
- Publication Type:Journal Article
- Keywords:
free-end edentulous;
occlusal rest;
finite element analysis
- From:
Journal of Shanghai Jiaotong University(Medical Science)
2009;29(11):1282-1284
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the stress distribution in the abutment and supporting tissues of distal-extension removable partial dentures with mesial and distal occlusal rest under loading. Methods A modular denture model was used to build a model of mandibular dentition defect ( 765┬567 loss) with HyperMesh 7.0 software. Prosthetics with mesial (M model) and distal occlusal rest (D model) were designed with UG 5.0 software, and the finite element models were completed with HyperMesh 7.0 software. The stress distribution was analyzed in the abutment and supporting tissues of distal-extension removable partial dentures with mesial and distal occlusal rest when bilateral vertical forces were applied. Results Compared with M model, D model provided much larger maximum stress in abutments and periodontal membrane. Stress of D model mainly concentrated on roots of 4┬4 , while that of M model uniformly distributed on roots of 43┬34 . The maximum stress of M model was significantly larger than that of D model on the mucosa of edentulous region. The maximum stress on alveolar bone of two models' edentulous region was equal, while the stress of M model distributed more widely. Conclusion It is prior to select mesial occlusal rest in distal-extension removable partial dentures.
