摘要
目的：探讨3种材质设置的下颌骨模型对牙种植体有限元分析的影响，以期明确正交各向异性的重要性。方法建立含种植体的完整下颌骨三维模型，对下颌骨分别采用各向同性、横观各向同性、正交各向异性模拟建模，并进行有限元分析比较。结果正交各向异性模型骨界面骨皮质等效应力、拉应力和压应力最大值分别是各向同性模型的1.2、1.2和1.1倍；骨松质等效应力、拉应力和压应力最大值分别是各向同性模型的1.6、2.6和3.3倍。正交各向异性模型骨界面骨皮质等效应变、拉应变和压应变最大值分别是各向同性模型的1.1、1.0和1.1倍；骨松质等效应变、拉应变和压应变最大值分别是各向同性模型的2.2、1.8和1.7倍。应力和应变变化的趋势大体上遵循各向同性、横观各向同性、正交各向异性材质顺序递增的规律，以骨松质为显著。另外，从应力和应变分布而言，正交各向异性最均匀，横观各向同性次之，各向同性最不均匀。结论牙种植体有限元分析中不应忽视下颌骨正交各向异性的力学性质。
Objective To investigate the effect of three types of material homogeneities（isotropy, transverse isotropy, and orthotropy） of mandible on the finite element analysis of implant. Methods Three-dimensional model of complete mandible containing an implant was constructed and analyzed with isotropic, transversely isotropic, and orthotropic models, respectively. Results The effective stress, tensile stress, and compressive stress of cortical bone of the orthogonal model were 1.2, 1.2, and 1.1 times larger than that of the isotropic model. The effective stress, tensile stress, and compressive stress of cancellous bone of the orthogonal model were 1.6, 2.6, and 3.3 times larger than that of the isotropic model. The effective strain, tensile strain, and compressive strain of cortical bone of the transversely isotropic model were 1.1, 1.0, and 1.1 times larger than that of the isotropic model. The effective strain, tensile strain, and compressive strain of cortical bone of the orthogonal model were 2.2, 1.8, and 1.7 times larger than that of the isotropic model. The stress and strain of cancellous bone increased when the material homogeneity changed from isotropy to transverse isotropy and to orthotropy. Moreover, in term of stress and strain distribution, the orthotropic modelling of mandible was most uniform followed by the transverse isotropy and the isotropy. Conclusions In the finite element analysis of implant system, the orthotropic property of the mandible can not be neglected.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2016年第10期628-633,共6页
Chinese Journal of Stomatology
关键词
有限元分析
牙种植体
下颌骨
各向异性
Finite element analysis
Dental implants
Mandible
Orthotropy
