中国组织工程研究 ›› 2011, Vol. 15 ›› Issue (39): 7242-7246.doi: 10.3969/j.issn.1673-8225.2011.39.006

• 数字化骨科 digital orthopedics • 上一篇    下一篇

下颌骨缺损个体化修复体的应力分析与优化设计

龚振宇1,李国华1,许瑞杰2,李涤尘2,周  冰1   

  1. 1解放军南京军区福州总医院口腔科,福建省福州市   350025
    2西安交通大学先进制造研究所,陕西省西安市  710049
  • 收稿日期:2011-04-06 修回日期:2011-06-29 出版日期:2011-09-24
  • 通讯作者: 李国华,博士,副主任医师,解放军南京军区福州总医院口腔科,福建省福州市 350025
  • 作者简介:龚振宇☆,男,1973年生,黑龙江省齐齐哈尔市人,汉族,2004年解放军第四军医大学毕业,博士,副主任医师,主要从事口腔颌面外科学与口腔种植学研究。 zhenyu_gong@yahoo.com.cn
  • 基金资助:

    福建省科技厅青年人才创新基金资助项目(2008F3089;2008F3088)。

Stress analysis and optimization design of titanium framework for repair of individual mandibular defects

Gong Zhen-yu1, Li Guo-hua1, Xu Rui-jie2, Li Di-chen2, Zhou Bing1   

  1. 1Department of Stomatology, Fuzhou General Hospital, Nanjing Military Area Command of Chinese PLA, Fuzhou  350025, Fujian Province, China
    2Institute of Advanced Manufacturing Technique, Xi’an Jiaotong University, Xi’an  710049, Shaanxi Province, China
  • Received:2011-04-06 Revised:2011-06-29 Online:2011-09-24
  • Contact: Li Guo-hua, Doctor, Associate chief physician, Department of Stomatology, Fuzhou General Hospital, Nanjing Military Area Command of Chinese PLA, Fuzhou 350025, Fujian Province, China
  • About author:Gong Zhen-yu☆, Doctor, Associate chief physician, Department of Stomatology, Fuzhou General Hospital, Nanjing Military Area Command of Chinese PLA, Fuzhou 350025, Fujian Province, China zhenyu_gong@yahoo.com.cn
  • Supported by:

    the Innovation Fund for the Youth Talents of Fujian Science and Technology Bureau, No. 2008F3089*, 2008F3088*

摘要:

背景:采用钛网支架整复下颌骨缺损常因设计不合理、固定不当造成修复体松脱甚至折断导致失败。
目的:针对一侧髁状突的下颌骨缺损,探讨使下颌骨断端和修复体应力分布合理的最佳设计方案和固定方式。
方法:建立下颌骨断端的简易三维模型和三种修复体模型,模拟咀嚼运动,施加垂直方向载荷,进行有限元法应力分析。
结果与结论:3种设计方案中,延伸板形态与下颌骨外形一致并包绕下颌骨下缘,并在下颌骨下缘增加固定螺钉的设计,在负荷时修复体变形最小,下颌骨断端及固定螺钉受力也最小。提示在单端固定式下颌骨修复体的设计中,应将延伸板形态设计为与下颌骨外形一致且包绕下颌骨下缘,并有必要增加下颌骨下缘处的固定。

关键词: 下颌骨, 修复体, 内固定, 有限元, 应力分析, 优化

Abstract:

BACKGROUND: With the development of research in the field of bone substitute in recent years, more and more cases of mandibular bone defects were treated with titanium frameworks in plastic surgery. The titanium frameworks became loosen and broken in even worse cases due to unreasonable design and fixation. Therefore stress analysis and structure design and nice fixation were the key to this problem.
OBJECTIVE: To analyze the stress and strain on titanium framework, stump of mandible and fixing screws in load when the defect area includes unilateral condyle.
METHODS: The three-dimensional finite element models of defective mandible and three types of titanium frameworks were established, and then the vertical load were exerted to simulate the mastication movement. Finally, stress and strain situation of different design were analyzed.
RESULTS AND CONCLUSION: Among the three types of frameworks, the one whose contour of extend plate was smooth and continuous with mandible and overcoated the inferior border of mandible got the minimum stress on stump and fixing screw, furthermore the framework got the least distortion. In design of titanium framework fixed unilaterally to repair the mandible bone defects including a condyle, the extend plate should be smooth and continuous with mandible and overcoat the inferior border, moreover, stronger fixation in inferior border of mandible is necessary.

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