Abstract
The dental magnetic attachment exerts less force laterally on an abutment tooth than conventional dental attachments, so it has wide application to various prosthesis. However, some defects of MRI are produced due to the magnetism of the keeper. Therefore, three kinds of stainless steel used as dental magnetic keeper and a composite resin fabricated with stainless steel powder as filler were examined to investigate the extent of the distortion of MRI. Factors for examination were differences and size of keepers. The purpose of this study was to explore the possibility of expanding the range of diagnosis with MRI, in relation to improvement of the keeper. The results were as follows:1. The SUS 430 stainless steel, as a material for the dental magnetic keeper, had the least distortion of MRI, and the distortion increased in the order of composite resin, SUS 447 J 1 and AUM 20.2. Keepers that were cut on both sides in parallel, had smaller diameters, or were thinner had less influence.3. In order to minimize the effect on MRI, it was suggested that it may be necessity to investigate materials and miniature the dental magnetic keeper.
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