利用Mimics和Freeform建立中国数字人上颌第一磨牙三维有限元模型  

Establishment and validation of the three-dimensional finite ele-ment model of the maxillary first molar with Mimics and Freeform

作　　者：张美超[1] 刘阳[1] 刘则玉 赵卫东[1] 李鉴轶[1] 姜楠[1] 唐雷[1] 

机构地区：[1]南方医科大学解剖教研室,广东省医学生物力学重点实验室,广州510515 [2]广州番禹人民医院口腔科,广州511400

出　　处：《医用生物力学》2006年第3期208-211,共4页Journal of Medical Biomechanics

基　　金：国家高技术研究发展(863)计划(2001AA231031;2002AA231021);广东省科技重点基金(2002B30611);广东省自然科学基金(04300684)

摘　　要：目的建立数字人上颌第一磨牙三维实体有限元模型,并进行了模型的有效性验证,为有关的修复体制作提供了生物力学了了。方法利用数字人男1号数了集,通过Mimics软件重建牙釉质、牙本质、牙髓三维结构,FreeForm软件对模型进行修饰,以IGES格式导入有限元软件Ansys8.0.完成有限元模型。在模型上进行垂直、侧向加载,分析牙体各部位的应力。结果建立了上颌第一磨牙有限元模型,包括牙釉质、牙本质、牙髓、模拟牙周膜、模拟牙槽槽。模型各部分模格划分模点模模元分模为:牙釉质:8303模点、5092模元,牙本质:104883模点、77357模元,牙髓:19818模点、12116模元,牙周膜:2321模点、2278模元,牙槽槽:31869模点、25264模元。垂直加载和斜向加载结果表明牙根颈1/3处是应力集中部位。结论利用Mimics和Freeform建立上颌第一磨牙三维有限元模型,具有较高的真实性和精确度,能够满足各种牙体生物力学分析的需要。Objective To establish a three-dimensional finite element analysis model of the maxillary first molar and validate the availability of the model in order to provide the biomechanics basis for prosthesis. Methods With the datum from Chinese digital human male No.l, a 3-D structures of enamel, dentin and elements pulp were constructed by the combination of software Mimics9.1 and Freeform. The meshed models were acquired and finished with Ansys 8.0. The stresses of the model were analyzed during the perpendicularity loading and the oblique loading, respectively. Result The model consisted of enamel, dentin, elements pulp, simulated periodontal membrane and simulated alveolar bone. The mesh division and the elements for each part of the model were： 8303 nodes and 5092 elements for ename; 104883 nodes and 77357 elements for dentin; 19818 nodes and 12116 elements for elements pulp; 2321 nodes and 2278 elements for periodontal membrane; 31869 nodes and 25264 elements for alveolar bone. The effect of the perpendicularity loading and the oblique loading indicated that the maximum force was at the 1/3 neck of root. Conclusions Combined usage of Mimics and Freeform, the finite element model constructed has the advantages of intact structure and precise elements which can simulate the natural condition and facilitate the further biomechanical research.

关 键 词：中国数字人 上颌第一磨牙 有限元 重建 

分 类 号：R322[医药卫生—人体解剖和组织胚胎学]