Patent ID: 6315563
Filing Date: 2001-11-13
Classification: A61C

Abstract:
An enossal single-tooth implant for a tight-fitting dental prosthesis having an abutment and an essentially cylindrical base member insertable into a bore introduced into a jawbone, said base member having a blind bore open toward one end of the base member and extending toward a closed end of the base member, said abutment being attachable to a face edge of the base member and being secured against twisting, said abutment having a centering collar at a first end insertable into a hollow cylindrical ring recess provided adjacent the one end of the base member, and a fastening head for the dental prosthesis separated from the centering collar by a shoulder receivable on the end face of the base member, said abutment having a through center bore for the acceptance of an abutment screw that penetrates through the abutment and can be introduced into the blind bore of the base member, said base member having a positive lock region in the ring recess comprising at least one base member positive lock element acting in a circumferential direction and the centering collar having a positive lock section of at least one abutment positive lock element complementary to the base member positive lock element, said positive lock region and positive lock section coacting to prevent twisting between the abutment and base member, the ring recess having a centering region arranged inward toward the closed end from the positive lock region, a circumferential guide surface of the positive lock region lying closest to the longitudinal center axis of the ring recess lies on a cylinder surface whose diameter is larger than the diameter of the centering region, the abutment positive lock element being provided spaced toward the first end from the shoulder on the cylindrical outside wall of the centering collar, the circumferential surface of the positive lock section lying closest to the longitudinal center axis of the centering collar lies on a cylindrical surface, whose diameter essentially corresponds to that of the cylindrical surface on which the circumferential guide surface of the positive lock region lying closest to the longitudinal center axis of the ring recess, a cylindrical centering section being arranged between the positive lock section and the first end of the abutment, the outside diameter of the centering section essentially coinciding with the inside diameter of the centering region of the base member, the improvements comprising the positive lock region being arranged inward of the end face of the base member, the end face of the base member merging with an annular base member sealing surface, which is fashioned concavely in a radial cross-section into a circumferential guide surface of the positive lock region, the positive lock section being arranged spaced from the shoulder toward the first end, the abutment having a cylindrical boundary surface between the positive lock section and said shoulder, the diameter of said boundary surface corresponding to the diameter of the centering collar and the cylindrical positive lock section outside of the abutment positive lock element, the shoulder extending from the boundary surface comprising an shell-shaped annular channel that forms a partially toroidal abutment sealing surface, the base member sealing surface and the abutment sealing surface interacting with one another to form an essentially toroidal seal chamber for the at least approximately complete acceptance of a seal ring and the seal ring composed essentially of elastically deformable material being received in said seal chamber.