Development of sealed cup yoke type dental magnetic attachment.
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.
Okuno
O
O
Tokyo Medical and Dental University.
Ishikawa
S
S
Imuro
F T
FT
Kinouchi
Y
Y
Yamada
H
H
Nakano
T
T
Hamanaka
H
H
Ishihata
N
N
Mizutani
H
H
Ai
M
M
D003799:Dental Stress Analysis; D003781:Denture Retention; D008280:Magnetics; D012493:Samarium
D012493:Samarium