Abstract
A dental magnetic attachment is a denture retainer with a permanent magnet. It is suggested that it possesses many advantages compared with the conventional mechanical attachment which has often caused trouble in durability for retentive force as well as in esthetics. However it has not been put into practical use because of an attractive force shortage and corrosion of the magnet in the oral cavity. An advanced type of dental magnetic attachment has been developed with a sandwiched type of magnetic circuit in which a rare earth magnet is sandwiched by a pare of yokes. The attachment has a higher attractive force more than 4.9 N in spite of its small size. The magnet is sealed with a stainless steel cap laser-welded to the yoke so as to be perfectly protected against corrosion.
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