[1]曾绍禹,李珊,杨向红,等.下颌三维有限元建模与动态载荷下的应力分析[J].中国医学物理学杂志,2023,40(5):647-652.[doi:DOI:10.3969/j.issn.1005-202X.2023.05.020]
　ZENG Shaoyu,LI Shan,YANG Xianghong,et al.Three-dimensional finite element modeling of the jaw and a stress analysis under dynamic loading[J].Chinese Journal of Medical Physics,2023,40(5):647-652.[doi:DOI:10.3969/j.issn.1005-202X.2023.05.020]
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下颌三维有限元建模与动态载荷下的应力分析()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
40卷
期数:
2023年第5期
页码:
647-652
栏目:
生物材料与力学
出版日期:
2023-05-26

文章信息/Info

Title:
Three-dimensional finite element modeling of the jaw and a stress analysis under dynamic loading
文章编号:
1005-202X（2023）05-0647-06
作者:
曾绍禹1; 李珊1; 杨向红2; 张顺关1; 汤克彬1
1.昆明理工大学机电工程学院， 云南 昆明 650500； 2.昆明市延安医院口腔科， 云南 昆明 650051
Author(s):
ZENG Shaoyu1;  LI Shan1;  YANG Xianghong2;  ZHANG Shunguan1;  TANG Kebin1
1. Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China 2. Department of Stomatology, Kunming Yanan Hospital, Kunming 650051, China
关键词:
下颌骨; 下牙列; 牙周膜; 有限元建模; 动态加载
Keywords:
Keywords: mandible lower dentition periodontal ligament finite element analysis dynamic loading
分类号:
R318；R782.6
DOI:
DOI:10.3969/j.issn.1005-202X.2023.05.020
文献标志码:
A
摘要:
目的：研究并完善基于锥形束CT（CBCT）图像的牙列、颌骨和牙周膜的三维有限元建模方法，分析模拟咀嚼动态加载时的应力分布。方法：选择一名牙列整齐、无牙体缺失、牙周健康的女性志愿者，用CBCT扫描头骨，从图像中提取下牙列与下颌骨模型，修复缺陷并进行曲面优化，对牙周膜建模并装配各部分构成三维实体模型，接着定义材料属性、划分网格、设置约束、施加载荷，分析牙列与周围骨组织在动态载荷作用下的应力分布。结果：成功构建人体下牙列、牙周膜和下颌骨的三维有限元模型。在动态加载下，等效应力峰值（44.73 MPa）位于下颌第一磨牙牙根处，牙周膜与牙颌骨在斜向载荷下会出现应力集中现象。结论：利用CBCT扫描结合多种软件可建立仿真度良好的下颌三维有限元模型，适用于后续生物力学研究。在Mimics软件中用不同阈值提取模型可使结果更精细。减小颊尖倾斜度降低受到的剪切力可改善应力集中现象。
Abstract:
Abstract: Objective To explore and improve an efficient method for the three-dimensional finite element modeling of dentition, mandible and periodontal ligament using cone beam CT (CBCT) images, and analyze the stress distribution under dynamic loading. Methods The skull of a female with regular dentition, no missing teeth and healthy periodontium was scanned with CBCT. The lower dentition and mandible models which were extracted from the image were processed with defects repair and surface optimization and the periodontal ligament was modeled and assembled with each part to form a three-dimensional solid model. After material property definition, mesh generation, constraint setting and loading, the stress distributions of dentition and surrounding bone tissues under dynamic loading were analyzed. Results The three-dimensional finite element models of lower dentition, periodontal ligament and mandible were successfully constructed. Under dynamic loading, the peak value of equivalent stress (44.73 MPa) was located at the root of mandibular first molar. Stress concentration occurred at periodontal ligament and mandible under oblique loading. Conclusion A three-dimensional finite element model of human jaw can be established using CBCT and a variety of software, and it is suitable for the subsequent biomechanical research. Extracting models with different thresholds in Mimics software can make the results more accurate. Lowering the shear force by decreasing the inclination of buccal cusp can reduce the stress concentration.

备注/Memo

备注/Memo:
【收稿日期】2022-12-26 【基金项目】云南省教育厅科学研究基金（2022Y206） 【作者简介】曾绍禹，硕士研究生，研究方向：医工结合，E-mail: 314034185@qq.com 【通信作者】李珊，研究生导师，副教授，研究方向：数字化设计与制造，E-mail: 624814911@qq.com
更新日期/Last Update: 2023-05-26