A coupling device for securing a dental restoration prosthesis to a maxillary implant anchorage, the coupling device comprising:
- a body extending in a longitudinal direction with a foot end and a head end, the body defining a through-hole extending from the foot end to the head end and designed to receive a fixing screw, the foot end being designed to bear on the maxillary implant anchorage, the body having an external cross-section decreasing from the foot end to the head end, wherein an external wall of the body is not circular to form a first part of an external anti-rotation device designed to prevent rotation between the prosthesis relative and the coupling device
- wherein the external anti-rotation device extends from the foot end;
- a stop designed to block a screw head of said fixing screw to fix the coupling device to the maxillary implant anchorage;
- a blocker fixed to the body, the blocker is deformable and has a retracted position and an extended position, the extended position having a larger external cross-section than the cross-section of the retracted position wherein, in the extended position, the blocker is designed to be inserted into at least one recess of a prosthesis covering the coupling device to immobilize the prosthesis on the coupling element along said longitudinal direction, wherein the blocker has a resting position which is the extended position for fixedly mounting the prosthesis on the coupling device in the absence of the fixing screw;
- wherein an internal face of the body defines a cavity designed to receive a head projecting from the maxillary implant anchorage, the cavity having a cross-section decreasing from the foot end to a top face, the through hole opening into the top face for the passage of the fixing screw and the foot zone forming a ring around the head, the cavity facing the first part of the external anti-rotation device perpendicularly to the longitudinal direction;
- wherein the stop is arranged between the blocker and the cavity in the longitudinal direction.