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 Session 3Chair: Masatake Akutagawa (The University of Tokushima)

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Mechanical Analysis of Extracoronal Magnetic Attachment using Three-dimensional Finite Element Method®


Y. Ohno, R. Kanbara, Y. Nakamura, T. Masuda, H. Kumano, K. Hayashi, H. Nakamura, T. Iwai,

Y. Takada1, Y. Tanaka

Department of Removable Proshodontics, School of Dentistry Aichi-Gakuin University

1Division of Dental Biomaterials, Tohoku University Graduate School of Dentistry


 Magnetic attachments were originally developed to apply for non-vital teeth. Plastic patterns for extracoronal attachments were developed to expand clinical applications including vital teeth. In clinical setting, a load is indirectly transmitted to the inferior part of extracoronal magnetic attachments through housings with groove joints. Therefore, a load is applied not only to the neck of extracoronal magnetic attachments, but also to grooves and housing joints. Although Shoji from the Department of Removable Prosthodontics, School of Dentistry, Aichi-Gakuin University, reported the results of strength test of extracoronal attachments with housings in 20th Japanese Society of Magnetic Applications in Dentistry, there is no theoretical validation. Our department has performed the elastic stress analysis of extracoronal magnetic attachments. However, the mechanism of plastic deformation remains to be elucidated.

 The purpose of the present study was to investigate the mechanical strength of extracoronal magnetic attachments using a three-dimensional finite element method to compare the results with the actual measurement data. The housing with joints were attached to extracoronal magnetic attachments.



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