Abstract: A helical dental implant has a multi-turn thread around the periphery of the implant body, the thread turns of which body have a variable depth which varies continuously around the periphery of the implant body. The depth of the thread turns runs around the periphery of the implant body in an undulating manner at least once from a minimum depth to a maximum depth, and from there back to a minimum depth. The profile of the thread turns is adapted in its dimension to the size of the osteons of the jaw bone fixed to the implant surface. The implant body has a profiled implant head, a cylindrical thread section and a conical thread section which is designed as self-tapping.

Abstract: A jaw implant has an implant body (30) which is attached by a screw (35) to an implant top portion (34). A borehole in the implant top portion forms a passage for the shaft of the screw and a supporting area for the screw head. The supporting area is designed as a truncated cone (40) and the part of the screw head coming to rest against it is designed as a female taper (39). By tightening the screw, the implant top portion is centered on the implant body without thereby exerting any pressure on the circumference of the implant top portion. The implant top portion is elastically deformable to a predetermined extent under the pressure of the tightened screw in the interface area between the implant body and the implant top portion, so that the interface profile of the implant top portion is adapted to the interface profile of the implant body. The elastically deformed implant top portion creates a restoring force which secures the screw in the tightened state to prevent it from loosening.

Abstract: A temporary attachment for a jaw implant has a molded piece made of an elastic material situated between a base and a head. The molded piece is deformable under the influence of a screw and this deformation is transferred to the surrounding tissue. By repeated tightening of the screw during a healing phase, the gingival tissue can be widened without resulting in tissue injury. Due to the shape of the base or the head, a predetermined deformation can be produced, and may be radially asymmetric. The direction of deformation can also be selected by varying the angular position of the base or the head with respect to the longitudinal axis of the implant.

Abstract: Parts of the surface of a bone implant that come in contact with bone cells are pretreated by sandblasting and/or acid etching and the pretreated microstructure is reshaped to produce a microstructure with an array of densely packed rounded domes separated by rounded lacunae. The size of the domes, the spacing between the domes and the depth of the lacunae are the same order of magnitude as the average size of the bone cells and the cell projections connecting the bone cells. The reshaping may be accomplished by sputtering a cover layer consisting of a biocompatible material onto the pretreated surface parts. A nanostructure comprised of an array of densely packed rounded domes separated by rounded lacunae can further superimposed on the microstructure of the implant surface.

Abstract: The surface of a bone implant disposed with a plurality of grooves (20) along its longitudinal axis or at a sharp angle thereto which form an angle &agr; radial the longitudinal axis (41) of the implant body (11) in at least one of multiple sections (16) and have different depths across their lengths. Said grooves may be configured in wedge or diamond shape or take the form of a curved wedge (231) or of elongated curved segments (251) of varying depths across their lengths and extending in axial, spiraling or crosswise-coiling manner relative the perimeter of the implant. Such a configured surface structure affords an improved deposition of bone tissue osteons. A titanium layer sputtered on the implant surface allows for osteocytes to collect in the troughs thereby created. The surface structure can be utilized preferably in the case of tooth implants but also in other bone implants including those having curved longitudinal axes.

Abstract: A bone implant, in particular a dental implant, has an implant body which is joined to an abutment body. A metal layer is arranged on the surface of the implant body or the abutment body. The metal layer extends over at least a portion of the contact area between the implant body and the abutment body and comprises a lower hardness than the abutment body and/or the implant body in the contact area. The metal layer provides an intimate, jointless and lasting connection between the implant body and the abutment body.

Abstract: The surface of a cylindrical, conical or stepped tooth implant has numerous groove-shaped recesses along its lengthwise axis or at a sharp angle to it. An alternative embodiment provides crosswise groove-shaped recesses at a sharp angle. In another embodiment, the surface of the implant body is divided along its lengthwise axis into numerous sections or steps that are separated by radial bands or transitions. The sections or steps have numerous groove-shaped recesses in their perimeter that follow the lengthwise axis of the implant body or run at a sharp angle or crosswise at a sharp angle. To create the tooth implant, a cylindrical, conical or stepped implant body with a smooth surface is preformed by creating groove-shaped recesses in a material-removing process. The material removing process is advantageously carried out with a digitally-controlled laser beam.

Abstract: A dental implant has a two-sided taper of the head part which is formed by bevels tapering down on both sides of the threaded bore toward the edges of the jaw bone. The bevels form lines of intersection with the circumference of the head part, starting from the edge areas of an end face of the head part and running at a variable height, corresponding to the shape of the upper edges of the jaw bone. A contact body connected to the crown is adapted to the taper at the upper edge of the head of the implant. The two-sided taper may be asymmetrical in design. The surface of the contact body facing the crown corresponds in shape to the head part and has bevels with a corresponding complementary shape. This yields a simplified prosthetic system with integrated security against twisting which has improved mechanical stability in both buccal and lingual directions.