上海交通大学学报（医学版）

›› 2009, Vol. 29 ›› Issue (11): 1282-.

• 专题报道（口腔修复学） • 上一篇    下一篇

近远中(牙合)支托对末端游离缺失修复应力分布的影响

金文忠1, 黄庆丰1, 魏 斌1, 张富强1, 崔 雯2, 王成焘2   

  1. 上海交通大学 1. 医学院第九人民医院口腔医学院 口腔修复科 上海市口腔医学重点实验室, 上海 200011；2. 机械与动力工程学院 生物医学制造与生命质量工程研究所, 上海 200240
  • 出版日期:2009-11-25 发布日期:2009-11-24
  • 通讯作者: 张富强, 电子信箱: fredzc@online.sh.cn。
  • 作者简介:金文忠(1982—), 男, 住院医师, 硕士；电子信箱: mitenike_kim@hotmail.com。
  • 基金资助:

    “十一五”国家科技支撑计划重点项目（2007BAI18B05）；上海市科学技术委员会资助项目（08DZ2271100）；上海市重点（特色）学科建设项目（T0202）

Stress analysis of distal-extension prosthetics with mesial and distal occlusal rest

JIN Wen-zhong1, HUANG Qing-feng1, WEI Bin1, ZHANG Fu-qiang1, CUI Wen2, WANG Cheng-tao2   

  1. 1. Department of Prosthodontics, Shanghai Key Laboratory of Stomatology, College of Stomatology, The Ninth People's Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200011, China；2. Institute of Biomedical Manufacturing and Life Quality Engineering, School of Mechanical Enginieering, Shanghai Jiaotong University, Shanghai 200240, China
  • Online:2009-11-25 Published:2009-11-24
  • Supported by:

    The Eleventh Five Year Plan National Key Science and Technology Project, 2007BAI18B05; Shanghai Science and Technology Committee Foundation, 08DZ2271100; Shanghai Leading Academic Discipline Fund, T0202

PDF (PC)

1499

摘要：

目的 研究下颌末端游离缺失修复中近中与远中(牙合)支托设计对加载时基牙及支持组织应力分布的影响。方法 将初始模型导入HyperMesh 7.0 软件建立下颌双侧末端游离缺失模型（765-567缺失），模型导入UG 5.0软件设计近中支托与远中支托修复方案，导入HyperMesh 7.0软件进行修复方案的有限元网格划分，分别建立近中(牙合)支托（M模型）与远中（D模型）(牙合)支托修复有限元模型。分析和比较两种模型在双侧垂直加载时基牙及支持组织最大应力及其分布情况。结果 在基牙及其牙周膜，D模型基牙牙冠、牙根及牙周膜的最大应力均显著大于M模型； D模型应力分布主要集中于4-4牙根，M模型43-34牙根应力分布较为均匀。在缺牙区黏膜，M模型最大应力显著大于D模型， 两种修复方案模型应力分布分别位于4-4远中位置和76-67位置。两种修复方案模型缺牙区牙槽骨最大应力接近，其中M模型应力分布更广泛。结论 采用常规可摘局部义齿修复末端游离缺失时，应优先选择近中(牙合)支托设计。

关键词: 末端游离缺失, (牙合)支托, 有限元分析

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.

Key words: free-end edentulous, occlusal rest, finite element analysis