An abutment (1) comprises: a base (2) intended to be stopped against a platform (501) of an implant (500), a collar (3) intended to be stopped against a prosthesis, a body (4) disposed between the base (2) and the collar (3) and intended to come in contact with a transmucosal portion of the gingiva, a shank (5) that protrudes in lower position from the base (2) in order to be disposed inside the implant (500), a threaded stem (6) that protrudes in lower position from the shank (5) in order to be screwed inside the implant, and a head (7) that protrudes in upper position from the collar (3) in order to anchor the prosthesis； the body (4) comprises a plurality of ribs (40) that are shaped as collars and alternated with a plurality of grooves (41)； each rib (40) and each groove (41) have a semicircular profile along an axial sectional plane.
