正常人上颌骨的生物力学分析

Biomechanical Analysis of the Normal Maxilla

目的建立正常人颅颌面骨三维有限元模型,并对上颌骨进行生物力学分析。方法对正常男性行螺旋CT扫描,应用数字影像传输以及MedGraphics和ANSYS8.0软件建立颅颌面骨三维有限元模型,模拟正常咬力来观察上颌骨的应力分布和位移。结果建立了正常人颅颌面骨三维有限元模型,包括273191个单元和260988个节点。加载后上颌骨表现为压应力,应力集中于尖牙区、第一磨牙上方和蝶骨翼突区,在颧牙槽嵴和尖牙区应力较大,前鼻棘和牙槽突可能发生的位移最大。结论正常人上颌骨三维有限元模型的生物力学分析结果与临床一致,为口腔颌面部肿瘤患者术后上颌骨重建提供了理论依据。

Objective To construct three-dimensional finite element model of normal cranio-maxillofacial bones and to analyse biomechanieal feature of the maxilla. Methods Based on the data of spiral CT scan from a normal male, threedimensional finite element model of cranio-maxillofacial bones was constructed by digital image transfer and software of MedGraphics and ANSYS 8.0. The normal occlusal forces were simulated to observe the stress distribution and deviation of the maxilla. Results Three-dimensional finite element model of normal cranio-maxillofacial bones was constructed. The elements and nodes of the model were 273 191 and 260 988, respectively. The stress of maxilla was pressure after the loads were applied and the stress was concentrated on the areas of canine, first molar and pterygoid process of sphenoid bone. The stress on the areas of zygomatico-alveolar crest and canine was higher than that of other areas. The deviations in the anterior nasal spine and alveolar process were the maximum. Conclusion Biomechanieal analysis of the normal maxilla was in accordance with the clinical research, so it provide basis for reconstruction of maxillectomy defect.