Dental Materials Journal
Online ISSN : 1881-1361
Print ISSN : 0287-4547
ISSN-L : 0287-4547
Development of Sealed Cup Yoke Type Dental Magnetic Attachment
Osamu OKUNOShin ISHIKAWAFlorentina Takako IIMUROYohsuke KINOUCHIHirohide YAMADATsuyoshi NAKANOHitoshi HAMANAKANobuo ISHIHATAHiroshi MIZUTANIMinoru AI
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1991 Volume 10 Issue 2 Pages 172-184,233

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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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© The Japanese Society for Dental Materials and Devices
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