Denture fixing attachment

1. A denture-fixing attachment for freely connecting a denture to a fixture implanted into an alveolar bone in a slanted direction by adjusting a denture angle of the denture with respect to the fixture, the denture-fixing attachment comprising:

a rod-shaped joint member having an upper end for supporting the denture fixed thereto and a locking protruding portion protruding laterally from a lower portion of the joint member; and

an abutment having a coupling portion formed in an outer surface of a lower portion thereof so as to be coupled to a fixture recess formed in the fixture, and a receiving portion formed in an upper portion thereof so as to receive the lower portion of the joint member therein,

wherein the receiving portion of the abutment includes a receiving recess for receiving the lower portion of the joint member inserted thereinto, and a stop protruding portion provided in the receiving portion above the receiving recess and having a guide groove disposed adjacent to the stop protruding portion for guiding coupling movement of the locking protruding portion fitted thereinto,

wherein the guide groove includes a first guide groove part formed in a vertical direction, a second guide groove part formed at an end of the first guide groove part in a horizontal direction, and a third guide groove part formed at an end of the second guide groove part in the vertical direction, and wherein a bottom end of the vertical third guide groove part is open downward along the vertical direction at a distal end thereof, such that the locking protruding portion moves through and out of the guide groove and into the receiving recess as the joint member is inserted thereinto.