Session 1 Chair: Tetsuo Ohyama (Nihon University)



Attractive Force of the Magnetic Attachment Using Three-Dimensional Finite Element Method

-An Influence of Magnetic Circuit-


H. Kumano1, Y. Nakamura1, H. Nagai1, R. Kanbara1, T. Masuda1, K. Hayashi1, Y. Takada2, Y. Ohno1 and Y. Tanaka1


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

2Division of Biomaterials, Tohoku University Graduate School of Dentistry




 Introducing optimal magnetic circuit allows the development of magnetic assembly with a higher clinical value. It has been considered that the finite element method is the best method for optimization of the magnetic circuit. The present study analyzed and evaluated the influence of the difference in magnetic circuit on attractive force and magnetic flux density using a three-dimensional finite element method. The analysis model was 1/4 model, and analysis objects included a keeper and 2 mm peripheral area of the magnetic assembly. In the present study, a total of 21 models were constructed. The diameter of a non-magnetic material in the shield disc of a magnetic assembly was increased by 0.1 mm to 2.0 mm based on the design of the present study. The analysis results showed that attractive force increased until the diameter of a non-magnetic material reached 0.5 mm, peaked at 0.5 mm, and reduced in the diameter larger than 0.5 mm. The present analysis suggested that attractive force of a magnetic attachment increased by adding a proper size of non-magnetic material to the shield disc of a magnetic assembly, and changing magnetic circuit.