纤维桩修复不同形态上颌尖牙根管的动力学与疲劳分析

发布时间：2018-04-21 05:06

本文选题：纤维桩 + 牙齿动力学　；参考：《口腔医学研究》2017年08期

【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。
[Abstract]:Objective: to analyze the dynamic and fatigue failure mechanism of normal and funnel-shaped canine canines repaired by fiber post with three dimensional finite element method, and to reveal the mechanism of fatigue failure in the process of tooth restoration. It provides a theoretical basis for the prediction of tooth life and the improvement of fatigue resistance. Methods: two maxillary canine models with root canals were obtained by using MicroCT scanning technique and Mimics UG software. The Nastran module of CAE in UG was used to simulate and analyze the tooth dynamics. The fatigue life of teeth is predicted and analyzed based on the SWT-Smith-Waston-Topper criterion. Results: the fatigue resistance of the teeth repaired with fiber post was better than that of funnel-shaped root canal, and the position of initial fatigue damage was the same as the position of maximum principal stress. The critical line of fatigue safety factor coincides with the transverse broken line of the restored tooth, and the vertical extension line with the maximum strain load coincides with the oblique broken line of the restored tooth. Conclusion 1) the service life of using fiber post to repair maxillary canine canals is longer than that of funnel-shaped canals. Fatigue failure is a comprehensive result of fatigue structural failure and fatigue crack growth. The occurrence probability of transverse fold and oblique fold is different under different use conditions.
【作者单位】：郑州大学第一附属医院;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;
【基金】：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)
【分类号】：R783.3

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