Finite element analysis with the three dimensional mimic osseointegrated implant model.

本研究的目的是开发一种新的三维（3D）模拟模型的骨结合种植体与详细的笔种植体骨结构的有限元分析（FEA）。根据猴体内两个骨整合种植体周围骨结构的3D计算机图形，通过从颊舌连续研磨表面以75 μ m间隔积累的数据构建模拟模型（Akagawa等人，J Prosthet Dent，1992）。对照模型由均匀松质骨包围的种植体构建。在植入物顶部施加143 N的垂直载荷，并将模拟模型中的诱导应力与对照模型中的诱导应力进行比较。两种模型的应力分布存在显著差异。在模拟模型中，应力分布在皮质骨（3.0-18.0 MPa）和松质骨（0.8-13.7 MPa）区域。而在对照模型中，应力集中在种植体颈部周围的皮质骨中（3.8-13.9 MPa），而松质骨中几乎没有应力（1.0-3.5 MPa）。这些结果表明，使用种植体被均匀松质骨包围的模型对研究结果进行仔细解释是必要的，并且这种新开发的模拟骨整合种植体模型可能对种植体生物力学有用。

The purpose of this study was to develop a new three-dimensional (3D) mimic model of an osseointegrated implant with detailed pen-implant bone structures for finite element analysis (FEA). Mimic models were constructed based on the 3D computer graphics of bone structure around two osseointegrated implants in a monkey by the data accumulated from buccolingual serial ground surfaces at 75-mu m interval (Akagawa et al, J Prosthet Dent, 1992). Control models were constructed with the implant surrounded by uniform cancellous bone. A vertical load of 143 N was applied at the top of the implant and induced stresses in the mimic model was compared with that in the control models. Remarkable 'differences of stress distribution in these two models were detected. In the mimic model, stresses were distributed in both cortical (3.0-18.0 MPa) and cancellous (0.8-13.7 MPa) bone areas. However, in the control model, stresses were concentrated in the cortical bone around at the implant neck (3.8-13.9 MPa) while little stress was induced in the cancellous bone (1.0-3.5 MPa). These results suggest that careful interpretation of the results from the studies with the use of the model where the implant was surrounded by uniform cancellous bone is necessary and that this newly developed mimic osseointegrated implant model may be useful for implant biomechanics.