System assembly interface with a multi-part superstructure carrier (20, 21a-21d; 221-223; 240-243) carrying a superstructure (1, 2) and an implant body having an internal clamping thread, wherein a part of the superstructure carrier (20, 21a-21d; 221-223; 240-243) is arranged on the implant body via an implant screw bolt (60, 61), - wherein the superstructure carrier (20, 21a-21d; 221-223; 240-243) consists of a superstructure main carrier (20, 21a-21d) and of an attachment carrier (221-223; 240-243) detachably screwed to it, - wherein the superstructure main carrier (20, 21a-21d) has a recess open towards the attachment carrier (221-223; 240-243) and towards the implant body, - wherein an internal drive thread is arranged in the recess in its region facing the implant body, - wherein the implant screw bolt (60, 61) has two external threads (71, 81) arranged one behind the other with or without spacing, of which the first is a drive external thread and the second is a clamping external thread, - wherein both external threads (71, 81) have different pitches with the same or different pitch signs, - wherein the external drive thread fits into the internal drive thread of the recess of the superstructure main carrier (20, 21a-21d) and the external clamping thread fits into the internal clamping thread of the implant body, - wherein the attachment carrier (221-223; 240-243) has a recess open towards the superstructure (1, 2) and the main superstructure carrier (20, 21a-21d), - wherein a drive internal thread is arranged in the recess in its region facing the superstructure main carrier (20, 21a-21d), - wherein between the respective superstructure main carrier (20, 21a-21d) and the attachment carrier (221-223; 240-243) placed thereon there is an attachment screw bolt with an opposing external drive thread and external clamping thread, and - wherein the external drive thread of the attachment bolt engages in the internal drive thread of the attachment carrier (241 - 243). - wherein the superstructure carrier (20, 21a-21d; 221-223; 240-243) consists of a superstructure main carrier (20, 21a-21d) and of an attachment carrier (221-223; 240-243) detachably screwed to it, - wherein the superstructure main carrier (20, 21a-21d) has a recess open towards the attachment carrier (221-223; 240-243) and towards the implant body, - wherein an internal drive thread is arranged in the recess in its region facing the implant body, - wherein the implant screw bolt (60, 61) has two external threads (71, 81) arranged one behind the other with or without spacing, of which the first is a drive external thread and the second is a clamping external thread, - wherein both external threads (71, 81) have different pitches with the same or different pitch signs, - wherein the external drive thread fits into the internal drive thread of the recess of the superstructure main carrier (20, 21a-21d) and the external clamping thread fits into the internal clamping thread of the implant body, - wherein the attachment carrier (221-223; 240-243) has a recess open towards the superstructure (1, 2) and the main superstructure carrier (20, 21a-21d), - wherein a drive internal thread is arranged in the recess in its region facing the superstructure main carrier (20, 21a-21d), - wherein between the respective superstructure main carrier (20, 21a-21d) and the attachment carrier (221-223; 240-243) placed thereon there is an attachment screw bolt with an opposing external drive thread and external clamping thread, and - wherein the external drive thread of the attachment bolt engages in the internal drive thread of the attachment carrier (241 - 243).