Chair: Tetsuo Ohyama (Nihon University)

#8

Investigation of an optimal magnetic attachment structure using three-dimensional finite element method

-An influence of different magnetic assembly and keeper structure on attractive force-

H Nagai .¹, H Kumano. ¹, R Kanbara. ¹,A Andou. ¹, K Tuda. ¹, T Iwata. ¹,

Y Nakamura. ¹, Y Takada.² and Y Tanaka¹.

¹Department of Removable Prosthodontics, School of Dentistry, Aichi-Gakuin University

²Division of Dental Biomaterials, Tohoku University Graduate School of Dentistry

Abstract

Magnetic attachments are designed to exert an attractive force at clinically useful levels. However, more improvement is necessary considering strict clinical conditions. The present study analyzed and investigated magnetic attachments from the point of magnetic circuit using a three-dimensional finite element method to enhance the performance of magnetic attachments.

An analysis model was constructed based on a dental magnetic attachment (GIGAUSS D 600, GC). Round shaped non-magnetic body was embedded in the shield disk of a magnetic assembly and center of the attractive surface of a keeper in the analysis model. Analysis was performed by changing the diameter of a non-magnetic material by 0.05 mm. Magnetic flux density distribution and attractive force were evaluated by the analysis.

An increase in magnetic flux density on the attractive surface was confirmed by embedding a non-magnetic body to a magnetic assembly and a keeper. However, magnetic flux density was oversaturated when it exceeded a certain value. A similar tendency was confirmed in attractive force.

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