| 摘要: |
| 目的：建立上颌前牙段及其牙周组织的高质量三维有限元模型。方法：应用薄层CT技术扫描得到的牙齿及牙周组织截面影像的DICOM数据，结合逆向工程软件Geomagic及CAD生成上颌前牙段及其牙周组织的iges曲面模型，利用Hypermesh划分网格并检查单元的质量，生成可分析的三维有限元实体模型。结果和结论：建立了上颌前牙段及其牙周组织（包括牙周膜、牙槽骨）的高质量三维有限元模型，包括640 396个单元，117 889个节点。这种新的建模方法简单易行，适合口腔牙体牙周等复杂组织的建模；所建模型相似性高，可供研究分析在各种不同正畸矫治力系统作用下，上颌前牙段单个牙齿或节段牙齿的生物力学规律。 |
| 关键词: 上颌前牙 有限元模型 3D Nurbs |
| DOI：10.3724/SP.J.1008.2007.01123 |
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| 基金项目: |
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| 3D Nurbs in establishment of three dimensional finite element model of maxillary anterior dentition segment |
| HE Yan1, LI Xiaozhi1, CHEN Zhixiong2, ZENG Minghui1, YANG Guangyin1, WANG Hansi1 |
| (1. Department of Stomatology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China; 2. Department of Civil Engineering, Chongqing University, Chongqing 400045) |
| Abstract: |
| Objective：To search for a new method for establishing high precision 3D finite element model of maxillary anterior dentition segment. Methods: Spiral CT (SCT) scanning was used to obtain the data of digital imaging and communications in medicine (DICOM) of teeth and the periodontal tissues; the data were used to construct the iges NURBS model by combining converse engineering software Geomagic and computeraided design (CAD). The 3D finite element analysis model was created after the unit lattice was meshed and checked by Hypermesh preprocessors. Results and Conclusion: We have successfully established the high quality 3D model of maxillary anterior dentition segment and the periodontal tissues (including periodontal ligament and alveolar bone); the model contained 640 396 tetrahedrons and 117 889 nodes. The present method is easytouse and is suitable for establishing the model for complex tissues like teeth and periodontal tissues. The established model has a high comparability and provides a good basis for studying the biomechanic behavior of maxillary anterior dentition segment under different orthodontic force systems |
| Key words: maxillary anterior dentition finite element model 3D Nurbs |
