title: Development of sealed cup yoke type dental magnetic attachment.
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. A 3.2 mm phi x 1.4 mm 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 4.4 mm in diameter and 2.1 mm in height was developed. The breakaway retention when the keeper touched it was 341 gf on average.
authors.affiliation: Tokyo Medical and Dental University.
authors.forename: O
authors.initials: O
authors.lastname: Okuno
authors.forename: S
authors.initials: S
authors.lastname: Ishikawa
authors.forename: F T
authors.initials: FT
authors.lastname: Imuro
authors.forename: Y
authors.initials: Y
authors.lastname: Kinouchi
authors.forename: H
authors.initials: H
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Nakano
authors.forename: H
authors.initials: H
authors.lastname: Hamanaka
authors.forename: N
authors.initials: N
authors.lastname: Ishihata
authors.forename: H
authors.initials: H
authors.lastname: Mizutani
authors.forename: M
authors.initials: M
authors.lastname: Ai
mesh_terms: D003799:Dental Stress Analysis; D003781:Denture Retention; D008280:Magnetics; D012493:Samarium
chemical_list: D012493:Samarium