Three-dimensional finite element analysis of stress status in dentin with microcracks

Qun LI; Chao WANG; Yuqi ZHENG; Liang CHEN

doi:10.16016/j.1000-5404.201611090

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Three-dimensional finite element analysis of stress status in dentin with microcracks

Clinical Medicine | 更新时间：2026-01-09

- Three-dimensional finite element analysis of stress status in dentin with microcracks
- Journal of Third Military Medical University Vol. 39, Issue 14, Pages: 1476-1480(2017)
- 作者机构：
  
  401147 重庆，重庆医科大学附属口腔医院，口腔疾病与生物医学重庆市重点实验室，重庆市高校市级口腔生物医学工程重点实验室
- 作者简介：
- 基金信息：
  
  the Science and Technology Projects of Yuzhong District, Chongqing(20140129);the Program for Innovation Team Building at Institutions of Higher Education in Chongqing (2016);the Project of Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education(渝教科〔2014〕55号)
- DOI：10.16016/j.1000-5404.201611090
  CLC： R318.01; R781.2; R781.33
- Received：10 November 2016，
  
  Revised：2017-02-20，
  
  Published：30 July 2017
- 稿件说明：
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Qun LI, Chao WANG, Yuqi ZHENG, et al. Three-dimensional finite element analysis of stress status in dentin with microcracks[J]. Journal of Third Military Medical University, 2017, 39(14): 1476-1480.
DOI：

Qun LI, Chao WANG, Yuqi ZHENG, et al. Three-dimensional finite element analysis of stress status in dentin with microcracks[J]. Journal of Third Military Medical University, 2017, 39(14): 1476-1480. DOI： 10.16016/j.1000-5404.201611090.

摘要

目的

基于三维有限元法研究根管预备过程中硬组织丧失和牙根微裂纹对上颌第二前磨牙的应力影响，为分析临床上根管治疗后患牙根折率增大的成因提供一定的参考。

方法

利用Micro-CT扫描上颌第二前磨牙

结合逆向工程软件建立完整牙体、仅有预备过程中组织丧失的牙体及预备后有不同牙根裂纹的预备后牙体3D模型，研究其在静态载荷下的应力情况。

结果

轴向力作用于完整牙体时，牙本质Von Mises应力集中分布于舌侧颈部；侧向力作用下，Von Mises应力集中分布于加力同侧牙根中上2/3处。轴向力和侧向力作用于预备后无牙根裂纹形成的牙体时，应力分布及应力值与完整牙体相比无明显变化。当牙根裂纹产生时，轴向力作用下应力值相对于预备前无明显变化，应力有向裂纹集中的趋势；侧向力作用下，应力峰值多增大明显，且应力多集中于裂纹局部。

结论

根管预备过程中的组织丧失对牙体应力情况无明显影响；牙根裂纹的产生会导致侧向力作用下应力值明显增大，且应力分布集中区域也多由牙体舌侧颈部转移至裂纹局部，牙根裂纹可能是导致根管预备后根折的重要因素。

Abstract

Objective

To study stress variation in the maxillary second premolars in response to root canal preparation and crack formation after canal enlargement and provide evidence for explaining the high incidence of endodontically treated tooth root fracture.

Methods

The tomographic images of the maxillary second premolars were obtained with micro-CT scanning

and three-dimensional (3D) finite element models of intact teeth

teeth after canal enlargement and teeth with dentinal microcracks after instrumentation were constructed with reverse engineering software. The stress magnitude and distribution in these 3D models were analyzed under static force loading.

Results

When an axial force was loaded on an intact tooth

Von Mises stress was distributed mainly in the cervical area of the lingual surface of the dentin. The application of a lateral force produced Von Mises stress mainly at the coronal two thirds on the same side where the force was loaded. In a tooth with microcracks

an axial force induced no obvious changes in the stress magnitude but caused the area where stress was concentrated to move towards the dentinal cracks; when a lateral force was loaded

the maximal stress increased obviously and the stress tended to be concentrated along the cracks.

Conclusion

Root canal preparation does not produce significant changes in stress of the maxillary second premolars

but the microcracks on the tooth can cause an increase in the stress magnitude along the dentinal cracks and may play a significant role in root fracture of an endodontically treated tooth.

关键词

Keywords

references

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