华西口腔医学杂志

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不同材料不同形态桩核修复上颌中切牙牙本质应力的有限元分析

张旭映1 孙竞2 卢军3   

  1. 1.同济大学附属口腔医院修复科; 2.种植科, 上海200072; 3.解放军第411医院口腔科, 上海200081
  • 收稿日期:2012-04-25 修回日期:2012-04-25 出版日期:2012-04-01 发布日期:2012-04-01
  • 作者简介:张旭映(1969—),女,黑龙江人,主治医师,硕士

Three dimensional finite element analysis on stress distribution in dentin of the maxillary central incisor
restored with different shapes and materials of post

Zhang Xuying1, Sun Jing2, Lu Jun3   

  1. 1. Dept. of Prosthodontics, School of Stomatology, Tongji University, Shanghai 200072, China; 2. Dept. of Dental Implantology, School of Stomatology, Tongji University, Shanghai 200072, China; 3. Dept. of Stomatology, PLA No. 411 Hospital, Shanghai 200081, China
  • Received:2012-04-25 Revised:2012-04-25 Online:2012-04-01 Published:2012-04-01
  • Contact: 孙竞,Tel:021-66313725
  • About author:Zhang Xuying(1969—),女,黑龙江人,主治医师,硕士

摘要:

Sun Jing,Tel:021-66313725

关键词: 桩核, 应力, 三维有限元分析

Abstract:

Objective To investigate the stress distribution in dentin of the maxillary central incisor restored with post-core which is related to different shapes and materials. Methods CT scan, digital-image processing and Unigraphics(UG) software were applied to construct the three-dimensional finite element models of maxillary central incisor restored with cone or column post-core. Based on this model, stress distribution of Von Mises in dentin with three different materials(polyethylene fiber resin, carbon fiber and zirconia) were analyzed respectively. Static loading(100 N) was used on the lingual boundary line between upper-one-third and middle-one-third of maxillary central incisor, the direction of the loading was 45° to the tooth long axis. Results In posts made of zirconia and restored with column post, the stress distribution in dentin was higher than with cone post(P<0.05). In posts made of polyethylene fiber resin or carbon fiber, there was no significant difference between the two post shapes (P>0.05). The elastic modulus of post-core materials affected the stress distribution, and the higher the elastic modulus was, the higher the stress concentrated. Conclusion Cone post excels column post in higher elastic modulus materials. Using the lower elastic modulus materials possibly can avail to the stress distribution and prevent the root breakage. During the root canal preparation, the dentin around the root neck should be conserved as more as possible, especially the dentin in the labial side.

Key words: post-core, stress, three-dimensional finite element analysis