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 andvalidate the availability of the model in order to provide the biomechanics basis for prosthesis. Methods With the datumfrom Chinese digital human male No.1, a 3-D structures of enamel, dentin and elements pulp were constructed by thecombination of software Mimics9.1 and Freeform. The meshed models were acquired and finished with Ansys 8.0. Thestresses of the model were analyzed during the perpendicularity loading and the oblique loading, respectively. ResultThe model consisted of enamel, dentin, elements pulp, simulated periodontal membrane and simulated alveolar bone. Themesh division and the elements for each part of the model were: 8303 nodes and 5092 elements for ename; 104883 nodesand 77357 elements for dentin; 19818 nodes and 12116 elements for elements pulp; 2321 nodes and 2278 elements forperiodontal membrane; 31869 nodes and 25264 elements for alveolar bone. The effect of the perpendicularity loading andthe oblique loading indicated that the maximum force was at the 1/3 neck of root. Conclusions Combined usage ofMimics and Freeform, the finite element model constructed has the advantages of intact structure and precise elementswhich can simulate the natural condition and facilitate the further biomechanical research.

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)