Kitagawa Tsuyoshi, Tanimoto Yasuhiro, Odaki Misako, Nemoto Kimiya, Aida Masahiro
Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba 271-8587 Japan.
J Biomed Mater Res B Appl Biomater. 2005 Nov;75(2):457-63. doi: 10.1002/jbm.b.30328.
The objective of this study was to investigate the influence of implant/abutment joint designs on abutment screw loosening in a dental implant system, using nonlinear dynamic analysis of the finite element method (FEM). This finite element simulation study used two dental implant systems: the Ankylos implant system (Degusa Dental, Hanau, German) with a taper joint (taper joint-type model), and the Bränemark implant system (Nobel Biocare, Gothenburg, Sweden) with an external hex joint (external hex joint-type model). The nonlinear dynamic analysis was performed using three-dimensional finite element analysis. In comparing the movement of the taper type-joint model and external hex type-joint model, it was found that the external hex type-joint model had greater movement than the taper type-joint model. The external hex joint-type model showed rotation movement, whereas the movement of the taper joint-type model showed no rotation. It was concluded that the nonlinear dynamic analysis used in this study clearly demonstrated the differences in rotation of components in dental implant systems with taper or external hex joints.
本研究的目的是使用有限元法（FEM）的非线性动态分析，研究牙科种植系统中种植体/基台连接设计对基台螺钉松动的影响。这项有限元模拟研究使用了两种牙科种植系统：具有锥形连接的Ankylos种植系统（德国Degusa Dental公司，哈瑙）（锥形连接型模型），以及具有外六角连接的Bränemark种植系统（瑞典诺贝尔生物公司，哥德堡）（外六角连接型模型）。使用三维有限元分析进行非线性动态分析。在比较锥形连接型模型和外六角连接型模型的运动时，发现外六角连接型模型的运动比锥形连接型模型更大。外六角连接型模型显示出旋转运动，而锥形连接型模型的运动则没有旋转。得出的结论是，本研究中使用的非线性动态分析清楚地证明了具有锥形或外六角连接的牙科种植系统中部件旋转的差异。
