3种加载方式下正常人下颌骨三维有限元应力分布分析

Stress analysis of the mandible by 3D FEA in normal human being under three loading conditions

目的:分析不同加载状态下正常人下颌骨应力分布的情况和特点。方法:采用螺旋CT扫描、CAD/CAM软件,进行下颌骨有限元建模,并在不同咬合状态下利用ANSYS软件对此模型进行三维有限元应力分析。结果:建立了正常人下颌骨三维有限元模型,在模拟正中、前伸、侧方咬合时,正常人下颌骨不同部位应力分布不均匀,性质不同,然而左右应力分布基本对称,髁突颈部、冠突后侧、下颌角等部位应力值较高。结论:下颌骨的材料性能与应力的大小密切相关。3种不同加载方式的应力分布基本一致,但对颞下颌关节的影响具有差异性。应力集中区位于髁突颈部、冠突后侧、下颌角等部位。

PURPOSE: The condition and character of stress distribution in the mandibular in normal human being during centric, protrusive, laterotrusive occlusion were analysed. METHODS: The three-dimensional finite element model of the mandibular was developed by helica CT scanning and CAD/CAM software ,and Three-dimensional finite element stress analysis was done by ANSYS software.RESULT:three-dimensional finite element model of the mandibular was generated. Under these three occlusal conditions, the stress of various regions in the mandible were distributed unequally, and the stress feature was different;while the stress of corresponding region in bilateral mandibular was in symmetric distribution. The stress value of condyle neck, the posterior surface of coronoid process and mandibular angle were high. CONCLUSION:The material properties of mandible were closely correlated to the value of stress. Stress distribution were similar according to the three different loading patterns, but had different effects on TMJ joint. The concentrated areas of stress were in the condyle neck, the posterior surface of coronoid process and mandibular angle .