#10 Stress Analysis of an Abutment Tooth with Extracoronal Magnetic Attachment -Introduction of Nonlinear Property into Three Dimensional Finite Element Method-
Kanbara R., Nakamura Y., Ohno Y., Ando A., Kumano H., Masuda T., Sakane M., Tanaka Y .
Removable Prosthodontics, School of Dentistry, Aichi-Gakuin University
The finite element method (FEM) has been widely used for dental application in recent years. However, it has been extremely difficult to analyze the oral mucosa and periodontal membrane of the abutment tooth with multiple methods. This includes a simple theoretical analysis, a model experiment, and the FEM for elastic deformation due to their viscoelasticity. The purpose of the present study was to construct a model that simulates human behavior by introducing nonlinear property into the soft tissue of the FEM model. 　    The load was applied on an abutment and the oral mucosa, and the Young modulus and Poison ratios were set so that the vertical displacement of teeth against the applied load is close to the known value. The two-phase conversion was incorporated into the finite element analysis in order to apply nonlinear property to the oral mucosa and periodontal membrane based on these results. 　The analysis result of this analysis model with nonlinear property showed more rational analysis value than conventional models, suggesting the validity of the new simulation model.