Abstract: A tooth-root implant of high fatigue strength, intended for a two-stage implantation technique, comprises a sleeve (1) which, in its inner region, has retention means (6b), on which a pressure plate (2a) rests loosely. An insertable superstructure bearing (3) is arranged on the pressure plate (2a) and is surrounded, at least partially, by a plastic casing (4). A screw plug (5) is also provided which closes off the upper part of the sleeve (1) in such a way that positive contact is made.

Abstract: An auditory ossicle prosthesis is described, comprising a plate (1), a shaft (2) applied eccentrically to the underside (3) of the plate and a groove (7) set into the top side (8) of the plate. The plate (1) has a mirror symmetric configuration with respect to at least one symmetry plane (5) perpendicular to the plane of the plate (8). The shaft (2) is applied so that its contact surface (4) is located on the trace (5) of the (principal) symmetry plane (5) of the plate (1), but at least removed from the boundary area of the plate (1) by one half of the shaft cross section. Preferably, the axis (9) of the shaft (2) includes with the normal (10) of the underside (3) of the plate an angle .alpha. of the order of magnitude of .alpha.=15.degree..+-.5.degree.. The groove (7) is arranged in the top side (8) of the plate, in its front half and aligned perpendicularly to the symmetry plane (5) of the prosthesis. The prosthesis may consist of a single piece or of two pieces. It consists of a bioactive material.