中国组织工程研究

中国组织工程研究 ›› 2010, Vol. 14 ›› Issue (22): 4010-4013.doi: 10.3969/j.issn.1673-8225.2010.22.005

• 数字化骨科 digital orthopedics • 上一篇    下一篇

牙齿牙周矫治装置三合一三维有限元模型的建立

卢红飞，艾  虹，麦志辉，陈  奇，陈  越   

  1. 中山大学附属第三医院口腔科，广东省广州市 510630 
  • 出版日期:2010-05-28 发布日期:2010-05-28
  • 通讯作者: 艾 虹，主任医师，中山大学附属第三医院口腔科，广东省广州市 510630
  • 作者简介:卢红飞★，女，1972年生，广东省广州市人，汉族，2003年中山大学毕业，硕士，主治医师，主要从事口腔正畸研究。 lhf_dr@163.com

Establishment of three-dimensional finite element model of maxillary anterior teeth, periodontal tissues and orthotic devices   

Lu Hong-fei, Ai Hong, Mai Zhi-hui, Chen Qi, Chen Yue   

  1. Department of Stomatology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou  510630, Guangdong Province, China
  • Online:2010-05-28 Published:2010-05-28
  • Contact: Ai Hong, Chief physician, Department of Stomatology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong Province, China
  • About author:Lu Hong-fei★, Master, Attending physician, Department of Stomatology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong Province, China lhf_dr@163.com

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433

被引次数

14

摘要：

背景：由于牙齿及其支持组织的外形不规则，力学性质不同的以及受力作用的复杂性等，令其受力的状态很难模拟。自Tanne首次建立上颌中切牙三维有限元模型以来，国内外相继建立了精度较高的组牙有限元模型，但结合矫治装置前牙段的三维有限元模型却少见报道。
目的：将薄层CT技术和多种图像处理软件及三维建模方法相结合，建立牙齿牙周矫治装置三合一的高精度三维有限元模型。
方法：采集1名健康女青年上颌前牙段及牙槽骨的螺旋CT扫描及原始数据，通过三维模型修饰、划分网格等程序建立起一个上颌前牙段牙齿、牙周组织(牙周膜、皮质骨、松质骨)及矫治装置(弓丝、托槽)三合一的三维有限元模型。
结果与结论：建立了上颌前牙段牙齿牙周矫治装置三合一的三维有限元模型，划分的单元采用三棱锥四面体结构，共生成  131 920个单元，194 321个节点。将薄层CT技术和多种图像处理软件及三维建模方法相结合，建立了精度较高的包括矫治系统(托槽、弓丝)的上颌前牙段及其牙周支持组织(牙周膜、皮质骨、松质骨)的三维有限元模型。该模型具有较好的几何相似性和力学相似性，适当的将牙周膜简化成可以满足分析要求，能较好的模拟临床实际情况进行力学研究，为进一步的生物力学分析和优化设计提供可靠的研究途径。

关键词: 上颌前牙, 三维有限元, 多层螺旋CT, 牙周, 矫治装置, 数字化口腔科技术

Abstract:

BACKGROUND: Teeth and their sustentacular tissues are characterized by irregular shapes, variant mechanical properties, as well as complex stress distribution, which result in difficulty in simulating their stress states. A series of maxillary dentition finite element model (FEM) with high precision has been established since Tanne established the first maxillary central incisor finite element model. However, studies with regard to maxillary anterior teeth combined with orthotic devices are rarely reported. 
OBJECTIVES: To establish a high precision three-dimensional FEM of maxillary anterior teeth segment-periodontal tissues-orthotic devices using thin-layer CT technique combined with image processing softwares and three-dimensional modeling.
METHODS: A healthy young woman was selected to get CT scan on maxillary anterior teeth segment, periodontal supporting tissues, treatment devices and a three-dimensional FEM was generated, including maxillary anterior teeth segment, periodontal tissues (periodontium, cortical bone, cancellous bone) and orthotic devices (brackets and wire).
RESULTS AND CONCLUSIONS: The three-dimensional FEM of maxillary anterior teeth was established, and divided by three pyramid tetrahedron structure, which consisted of 131 920 elements and 194 321 nodes. The three-dimensional FEM of maxillary anterior segment exhibits a better geometric similarity and mechanical similarity. By simplifying periodontium as linear elastic material, this model benefits further analysis and optimizations biomechanical design.  

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