| 摘要 |
PROBLEM TO BE SOLVED: To prevent an attractive force from declining even if a void occurs with a keeper and improve reliability during use by using a cylindrical magnet whose magnetization direction is specified, for a permanent magnet of a magnet structure and providing a columnar internal yoke in the inside and concentrically a cylindrical external yoke in the outside. SOLUTION: In an attachment where an artificial tooth is maintained by using a magnetic attraction between a magnet structure embedded in an artificial tooth and a keeper, the magnet structure is structured by providing a cylindrical eternal magnet 2 magnetized in one direction orthogonal to a face passing the central axis, a columnar internal yoke 1 made from a soft magnetic material to be arranged in the inside, a cylindrical external yoke made from a soft magnetic material arranged in the external wall of the eternal magnet 2 concentrically, thereby flowing a magnetic flux from the external yoke 3 to the keeper and further to the internal yoke at an angle nearly vertical to each other and preventing an attractive force from declining even if a void occurs.
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