口腔医学研究

口腔医学研究 ›› 2017, Vol. 33 ›› Issue (8): 860-864.DOI: 10.13701/j.cnki.kqyxyj.2017.08.015

• 临床研究论著 • 上一篇    下一篇

纤维桩修复不同形态上颌尖牙根管的动力学与疲劳分析

肖燕1*, 沈凯奇1, 郭嘉1, 张文博2, 刘冰1   

  1. 1. 郑州大学第一附属医院 河南 郑州 450000;
    2. 西北工业大学现代设计与集成制造技术教育部重点实验室 陕西 西安 710000
  • 收稿日期:2017-01-05 出版日期:2017-08-20 发布日期:2017-08-28
  • 通讯作者: 肖燕,E-mail: Xiaoyan@zzu.edu.cn
  • 作者简介:肖燕(1974~ ),女,河南郑州人,副主任医师,硕士生导师,主要从事口腔临床及基础研究工作。
  • 基金资助:
    国家青年自然科学基金项目(编号:81400492);河南省教育厅基础前沿(编号:132300410426)

Dynamic Features and Fatigue Failure of Maxillary Canine Root Canal with Various Profiles after Restored with Fiber Posts.

XIAO Yan1*, SHEN Kai-qi1, GUO Jia1, ZHANG Wen-bo2, LIU Bing1.   

  1. 1. The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China;
    2. The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Ministry of Education, Xi’an 710000, China.
  • Received:2017-01-05 Online:2017-08-20 Published:2017-08-28

PDF (PC)

352

摘要： 目的:利用三维有限元分析方法对纤维桩修复正常和漏斗状根管上颌尖牙进行动力学和疲劳失效机理分析,揭示修复后牙齿在使用过程中发生疲劳失效的机制,为临床上纤维桩修复后牙齿的寿命预测和抗疲劳性的提升提供理论基础。方法:利用MicroCT扫描技术并结合Mimics、UG软件获得两种根管形态的上颌尖牙模型,运用UG中CAE的Nastran模块模拟分析牙体动力学状况,并基于SWT(Smith-Waston-Topper)准则对牙齿疲劳寿命进行预测并对其疲劳失效进行分析。结果:利用纤维桩修复正常形态根管牙齿的抗疲劳性能优于漏斗状根管,牙齿最初发生疲劳损伤的位置与最大主应力位置相同,疲劳安全系数临界线与修复后牙齿的横折线重合,在最大应变下载荷的垂线延伸线与修复后牙齿的斜折线重合。结论:1)利用纤维桩修复上颌尖牙正常形态根管的使用寿命高于漏斗形根管;2)纤维桩修复牙齿的最大主应力所在区域即为牙齿疲劳易损伤区域;3)纤维桩修复牙齿的疲劳失效是疲劳结构性破坏和疲劳裂纹扩展的综合结果,横折和斜折的发生概率在不同使用情况下也不相同。

关键词: 纤维桩, 牙齿动力学, 寿命预测, 失效形式

Abstract: Objective: To analyze the dynamics and fatigue failure mechanisms of the maxillary canine with normal or funnel-shaped root canal restored by fiber posts using the 3D finite element analysis. Methods: The eye tooth model of two root canals was obtained using the Micro CT scan and Mimics and UG software. The Nastran model was used to mimic the dynamic characteristics of the tooth. Smith-Waston-Topper principal was utilized to predict the fatigue life of the teeth, while the fatigue failure was also analyzed. Results: The fatigue resistance of the root canal with normal profile restored by the fiber posts was superior to that of the funnel-shaped root canal. The position of initial fatigue damage was similar to the position with the maximal principal stress. The threshold of the fatigue safety factors was coincidented with the transverse turning curve after repairment. In the presence of maximal strain, the line stretcher of the perpendicular line of the load was coincidented with the oblique turning curve after repairment. Conclusion: The shelf life of the root canal with normal profile was higher than that of the funnel-shaped root canal restored by the fiber posts. The localization of the maximal principal stress restored by fiber posts was the fatigue region susceptible to the injury. The fatigue failure was mainly induced by the fatigue structural damage and extension of the fatigue crack. The possibility of transverse and oblique fold was not the same under various conditions.

Key words: Fiber posts, Tooth dynamics, Shelf life prediction, Failure type

中图分类号: