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3D Nurbs曲面建模法建立上颌前牙段及其牙周组织的有限元模型
何艳1,李晓智1,陈志雄2,曾明慧1,杨光银1,王汉思1
0
(1.重庆医科大学附属第一医院口腔矫形科,重庆 400016;2. 重庆大学土木工程学院,重庆 400045)
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
基金项目:
3D Nurbs in establishment of three dimensional finite element model of maxillary anterior dentition segment
HE Yan1, LI Xiaozhi1, CHEN Zhixiong2, ZENG Minghui1, YANG Guangyin1, WANG Hansi1
(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 computeraided design (CAD). The 3D finite element analysis model was created after the unit lattice was meshed and checked by Hypermesh preprocessors. 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 easytouse 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