Abstract: The invention relates to a method for checking a preparation (14) of a prepared tooth (13) using CAD methods and utilizing a first 3D image (11) of the prepared tooth (13) including at least a portion of its adjacent tooth (2, 3). The subregions (24, 25, 53, 55, 78) of the preparation (14, 110, 130, 140, 152) are marked whose distances (31.2, 32.2, 51, 75) from the adjacent teeth (2, 3), from the desired preparation (5) and/or from a gingival surface (76) and/or the angle (60) thereof and/or the roughness thereof are outside the limits (54, 56, 77, 79) of a respective tolerance range (52).

Abstract: The method is used for automated production of dental prostheses in the form of ceramic restorations or ceramic abutments of dental implants, using a computer-controlled laser for shaping by means of removal of material from a ceramic blank. The special feature is that at least one three-dimensionally contoured surface region of the dental prosthesis (4, 8) is machined out of the ceramic blank (3) by means of an ultra-short-pulse laser (1) and shaped into the predetermined shape. Preferably, the ultra-short-pulse laser is first employed in such a way that the great majority of the material to be removed from the ceramic blank is cut off in pieces by the ultra-short-pulse laser, and then the ultra-short-pulse laser need merely vaporize the remainder in an erosive operation.

Abstract: For non-contact and non-destructive measurement of surfaces of cast models of a tooth in restorative dentistry, a coherent-radar device, whose measurement direction is brought generally into alignment with the insertion or placement direction for the dental restoration is used, with the help of a real-time video image, which is recorded either in the insertion or placement direction. The sample holder is a commercially available magnetic tilting table. A light source can be used, which has a narrow bandwidth of about 3-40 nanometers.

Abstract: The method is used for automated production of dental prostheses in the form of ceramic restorations or ceramic abutments of dental implants, using a computer-controlled laser for shaping by means of removal of material from a ceramic blank. The special feature is that at least one three-dimensionally contoured surface region of the dental prosthesis (4, 8) is machined out of the ceramic blank (3) by means of an ultra-short-pulse laser (1) and shaped into the predetermined shape. Preferably, the ultra-short-pulse laser is first employed in such a way that the great majority of the material to be removed from the ceramic blank is cut off in pieces by the ultra-short-pulse laser, and then the ultra-short-pulse laser need merely vaporize the remainder in an erosive operation.

Abstract: In a two-part dental implant including an implant body and an implant abutment mounted onto the implant body, a metal layer is galvanically deposited on the contact area of the implant body or the abutment and the two are firmly engaged by a mounting screw generating a contact force which is sufficient to cause plastic deformation of the galvanically deposited metal layer which, in this way, fills any gaps between the implant body and the abutment.