Patent ID: 8257081
Filing Date: 2012-09-04
Classification: A61C

Abstract:
1. A dental attachment configured to be embedded in a denture base so as to attach to a keeper by a magnetic attractive force, the keeper including a soft magnetic material and embedded in a tooth root, comprising: an attachment main body including a magnetic body delivering magnetic attractive force; and a cap covering a head portion of the attachment main body and located on a side of the magnetic body opposite to an attractive surface that attaches to the keeper, wherein the cap includes a non-magnetic material and is coupled to the attachment main body so as to be configured to move, while remaining coupled to the attachment main body, between a contacting position (A) at which the cap is in contact with the head portion and an extended position (B) spaced from the contacting position (A) by a distance, a space being provided between the head portion and the cap, in the extended position, wherein the attachment main body further includes a yoke, a portion of the outer peripheral surface of the yoke being straight and without a taper, the yoke including soft magnetic material with a concave part which accommodates the magnetic body, a disk including soft magnetic material which is installed so as to close an opening part of the concave part while the magnetic body is housed in the concave part, and a ring shaped contacting part including the non-magnetic material which connects the disk and the yoke, wherein the cap covers the head portion, which is located on an opposite side of the yoke to the opening part of the concave part of the yoke, wherein the yoke has a collar and a cylindrical outer peripheral surface, said collar protrudes radially outward from the cylindrical outer peripheral surface of the yoke at the edge of the head portion of the yoke, and the cap includes a bottom portion, which faces the head portion of the yoke, and a lateral portion, which faces the cylindrical outer peripheral surface of the yoke and covers the collar, and the lateral portion includes a protruding part protruding inward to the cylindrical outer peripheral surface of the yoke, and the protruding part and the collar are engaged when the cap is located at the extended position (B) and said protruding part and said collar are not engaged when said cap is located at said contacting position (A), and wherein the cap is configured to move, without bias generated by the dental attachment, from the extended position (B) to the contacting position (A) and vice versa.