Mounting interface between a superstructure support carrying a superstructure (100, 120) - having a continuous, bent recess - and an implant body having an internal thread with the aid of a screw bolt, - wherein the superstructure support and the implant body have an at least partially complementary coupling geometry (15, 44) to ensure the torsion resistance of the assembly interface, - wherein the recess of the superstructure support is open towards the superstructure (100, 120) and the implant body, - wherein an internal drive-thread is arranged in the recess in its region facing the implant body, - wherein the screw bolt has two external threads (71, 81) arranged one behind the other with or without spacing, of which the first is an external drive-thread and the second is an external clamping-thread, - wherein both external threads (71, 81) have different pitches, - wherein the external drive-thread fits into the internal drive-thread of the recess of the superstructure support and the external clamping-thread fits into the internal clamping-thread of the implant body, - wherein the screw bolt has an intermediate region between the external clamping-thread and the external drive-thread, wherein either - the intermediate region is composed of a cylindrical journal and a stop flange which can be placed against a flat stop collar, wherein the stop collar forms a transition between the internal drive thread and a cylindrical bore of the recess, or - wherein the intermediate region is formed without a stop collar and wherein the internal drive-thread is adjoined by a cylindrical rear grip bore which merges into a stop zone in the form of a constriction which widens in the direction of the rear grip bore, so that the screw bolt can be screwed into the superstructure support from the internal drive-thread before the superstructure support is fastened to the implant body to such an extent that its external drive thread leaves the internal drive thread again in order to enter the rear-grip bore,and wherein a thread-less cylindrical pin of the screw bolt fits through the constriction with little play. - wherein the superstructure support and the implant body have an at least partially complementary coupling geometry (15, 44) to ensure the torsion resistance of the assembly interface, - wherein the recess of the superstructure support is open towards the superstructure (100, 120) and the implant body, - wherein an internal drive-thread is arranged in the recess in its region facing the implant body, - wherein the screw bolt has two external threads (71, 81) arranged one behind the other with or without spacing, of which the first is an external drive-thread and the second is an external clamping-thread, - wherein both external threads (71, 81) have different pitches, - wherein the external drive-thread fits into the internal drive-thread of the recess of the superstructure support and the external clamping-thread fits into the internal clamping-thread of the implant body, - wherein the screw bolt has an intermediate region between the external clamping-thread and the external drive-thread, wherein either - the intermediate region is composed of a cylindrical journal and a stop flange which can be placed against a flat stop collar, wherein the stop collar forms a transition between the internal drive thread and a cylindrical bore of the recess, or - wherein the intermediate region is formed without a stop collar and wherein the internal drive-thread is adjoined by a cylindrical rear grip bore which merges into a stop zone in the form of a constriction which widens in the direction of the rear grip bore, so that the screw bolt can be screwed into the superstructure support from the internal drive-thread before the superstructure support is fastened to the implant body to such an extent that its external drive thread leaves the internal drive thread again in order to enter the rear-grip bore,and wherein a thread-less cylindrical pin of the screw bolt fits through the constriction with little play.