A keeper for an implant comprising (a) a keeper body made of a soft-magnetic material, which comprises a recess for receiving a head of an abutment having a female thread, and a female thread extending along a center axis to have communication with the recess and having a larger nominal diameter than that of the female thread of the abutment and (b) a stepped screw member comprising a small-diameter screw portion threadably engageable with the female thread of the abutment, and a large-diameter screw portion threadably engageable with the female thread of the keeper body the keeper body being strongly fixed to the abutment by the stepped screw member, when the keeper body is rotated in a threadably engaging direction, after the female thread of the abutment threadably engages the small-diameter screw portion, and after the female thread of the keeper body threadably engages the large-diameter screw portion.(a) 암나사부를 가지는 교각치의 헤드부를 지지하는 오목부와, 오목부와 연통되도록 중앙축선을 따라 설치되고, 교각치의 암나사부보다 큰 호칭 직경을 가지는 암나사부를 가지는 연자성 재료로 이루어지는 키퍼 본체와, (b) 교각치의 암나사부와 나사결합되는 소경 나사부와, 키퍼 본체의 암나사부와 나사결합되는 대경 나사부를 가지는 2단식 나사 부재를 구비하고, 교각치의 암나사부에 소경 나사부를 나사결합시키고, 키퍼 본체의 암나사부에 대경 나사부를 나사결합시킨 후, 키퍼 본체를 나사장착 방향으로 회전시키면, 2단식 나사 부재에 의해 키퍼 본체가 교각치에 견고하게 체결 장착되는 것을 특징으로 하는 임플란트용 키퍼.
