Patent ID: 7654824

Claim:
An extension piece for a dental implant comprising: a head part which serves as a basis for a retention element, the head part having one end and a remote end, a threaded stem arranged at said one end of the head part with which the extension piece can be screwed into the dental implant, the head part being of substantially cylindrical design and having at said remote end at least one reference form, which defines the circumferential position of the extension piece and by which reference form the circumferential position of the extension piece can be transferred to a working model, the head part having, between the reference form and the threaded stem, a plurality of non-cylindrical gripping surfaces by which the extension piece can be gripped and screwed into the dental implant with a tool engaging on the gripping surfaces, the reference form comprising a semicyclindrical outer circumferential surface of a semicircular cylinder extending parallel to the screw axis of the extension piece and a substantially diagonally cut reference surface, and wherein a bevel is provided between the reference surface and the semicylindrical outer circumferential surface.