Abstract: Suprastructure for a dental implant is provided with a false stump defining a prosthesis base plate, a shank for anchoring the false stump, with the shank including partially extending slots forming surface segments capable of radial expansion, a hollow core opening at a free end of the false stump and including a converging ramp at the free end, a series of balls positioned in the hollow core, with one of the balls abutting against the converging ramp so as to be retained thereby and to exert a spacing pressure onto the surface segments, and a screw abutting against a first ball of the series of balls to cause the balls to be moved against the converging ramp. The suprastructure can be used in combination with a tubular implantal stump adapted to be anchored in the osseous site and to accommodate the shank of the suprastructure.