[1]李群,王超,郑玉琪,等.牙本质微裂纹对牙体应力影响的三维有限元研究[J].第三军医大学学报,2017,39(14):1476-1480.
 LI Qun,WANG Chao,ZHENG Yuqi,et al.Three-dimensional finite element analysis of stress status in dentin with microcracks[J].J Third Mil Med Univ,2017,39(14):1476-1480.
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牙本质微裂纹对牙体应力影响的三维有限元研究(/HTML )
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《第三军医大学学报》[ISSN:1000-5404/CN:51-1095/R]

卷:
39卷
期数:
2017年第14期
页码:
1476-1480
栏目:
临床医学
出版日期:
2017-07-30

文章信息/Info

Title:
Three-dimensional finite element analysis of stress status in dentin with microcracks
作者:
李群王超郑玉琪陈亮
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
Author(s):
LI Qun WANG Chao ZHENG Yuqi CHEN Liang

Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Stomatological Hospital of Chongqing Medical University,  Chongqing,401147, China

关键词:
牙体应力牙本质微裂纹根管预备三维有限元法Micro-CT
Keywords:
micro-CT three-dimensional finite element analysis root canal preparation microcracks stress
分类号:
R318.01;R781.2;R781.33
文献标志码:
A
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:
ObjectiveTo 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. MethodsThe 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. ResultsWhen 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. ConclusionRoot 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.

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更新日期/Last Update: 2017-07-24