Development of Sealed Cup Yoke Type Dental Magnetic Attachment

Osamu OKUNO; Shin ISHIKAWA; Florentina Takako IIMURO; Yohsuke KINOUCHI; Hirohide YAMADA; Tsuyoshi NAKANO; Hitoshi HAMANAKA; Nobuo ISHIHATA; Hiroshi MIZUTANI; Minoru AI

doi:10.4012/dmj.10.172

Osamu OKUNO, Shin ISHIKAWA, Florentina Takako IIMURO, Yohsuke KINOUCHI, Hirohide YAMADA, Tsuyoshi NAKANO, Hitoshi HAMANAKA, Nobuo ISHIHATA, Hiroshi MIZUTANI, Minoru AI

Author information

Osamu OKUNO
Division of Metallurgy, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
Shin ISHIKAWA
Department of Prosthodontics I, School of Dentistry, Tokyo Medical and Dental University
Florentina Takako IIMURO
Division of Metallurgy, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
Yohsuke KINOUCHI
Department of Electrical Engineering, Faculty of Engineering, Tokushima University
Hirohide YAMADA
Magnetic and Electronic Materials Research Laboratory, Hitachi Metals Ltd.
Tsuyoshi NAKANO
Division of Metallurgy, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
Hitoshi HAMANAKA
Division of Metallurgy, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
Nobuo ISHIHATA
Department of Prosthodontics I, School of Dentistry, Tokyo Medical and Dental University
Hiroshi MIZUTANI
Department of Prosthodontics I, School of Dentistry, Tokyo Medical and Dental University
Minoru AI
Department of Prosthodontics I, School of Dentistry, Tokyo Medical and Dental University

Keywords: Attachment, Magnet, Attractive force

JOURNAL FREE ACCESS

1991 Volume 10 Issue 2 Pages 172-184,233

DOI https://doi.org/10.4012/dmj.10.172

Details

Abstract

The purpose of this study was to develop a small cup type yoke magnetic attachment sealed from oral fluid. The magnetic device forms a closed circuit between the magnet, yokes, and keeper. A3.2mmφ×1.4mm SmCO₅ magnet was put into a cup yoke of 447J1 stainless steel and covered by 447J1 stainless steel disk yoke with a 316L stainless steel ring. To protect the magnet from corrosion, the connection was sealed by laser welding. The optimum dimensions were figured out by a finite element method. The performance of the magnetic attachment was investigated. As a result, a magnet device 4.4mm in diameter and 2.1mm in height was developed. The breakaway retention when the keeper touched it was 341 gf on average.

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