| 摘要 |
PROBLEM TO BE SOLVED: To resolve a problem such as a deflection caused by heat contraction on the upper face of a keeper by welding the lower outer peripheral edge of the keeper to the upper peripheral edge of an inner crown in a fitting structure for fitting the keeper serving as a component of a magnetic attachment used for a denture on the inner crown. SOLUTION: A magnetic material attracted to a magnet structural body, e.g. magnetic stainless steel, is used for a keeper 1 serving as a component of a magnetic attachment. An inner crown 2 is formed into a shape inserted into a denture, and it is manufactured with a material such as a gold alloy by casting in consideration of machinability. In fitting the keeper 1 to the inner crown 2, the lower outer peripheral edge of the keeper 1 is welded to the upper peripheral edge of the inner crown 2 by laser welding. It is important to match the inner crown 2 and the keeper 1 at the connection section as close as possible for laser welding, and a plastic for a keeper fixing plane is positioned on the same plane as a surveyor.
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