Abstract: The invention relates to a surgical tool (1) for cutting a helical groove in a bone with a body (2) receiving at least a portion of a drive shaft (9) and a tool part (3) held on same comprising a functional element (5) that produces the groove in the bone by oscillating. The tool part (3) comprises a projecting, rotatable shaft (4) at whose end opposite the body (2) the pin (5) constituting the functional element extends through an aperture (8) out of the shaft (4) that, in order to remove material of the bone, can oscillate longitudinally. The shaft (4) is coupled in such a way with the drive shaft (9) that the latter exerts torque on the shaft (4) and the pin (5) at least indirectly, at least one wing (6) projecting radially from the shaft (4) that extends at a spacing beginning behind the pin (5) in the peripheral direction of the shaft (4) helically in the direction of the body (2).

Abstract: An endosseous jaw implant for insertion into a cavity formed in a jaw bone has a central implant body onto which at least one anchor wing is integrally molded. The anchor wing has a wedge-shaped cross section, and at least a front edge and/or a back face or an axis of the center of gravity of the anchor wing extends secantally away from the implant body.

Abstract: Disclosed is a device (1) for creating a screw-shaped, especially a worm-shaped recess in a bone. In order to design a device (1) of said type which allows the recess to be quickly and safely introduced, a driving mechanism (3 to 9, 18 to 23) is proposed which applies torques (M1, M3) to the tool (13) via the shaft (9), said torques (M1, M3) extending in the direction of rotation of the tool (13). The first torque (M1) has an at least nearly constant quantity while the second torque (M3) is greater than the first torque (M1) and continuously changes the direction of rotation thereof when material is removed.

Abstract: In a jaw implant, an anchoring part (1) is designed in the manner of a helix (3), in which the size ratio of external diameter (Da) to core diameter (Di) is equal to or greater than 2. The invention also proposes a two-step method, and a device for carrying out the method using a special tool, in order to produce a helical recess in the jaw bone into which the anchoring part (1) can be screwed.