Dental prosthesis production device and dental prosthesis

A method for production of a dental prosthesis using a production device, comprising:

• providing an implant (40), an abutment (10) having a shape that is compatible with the implant (40) and having a cylindrical section, and a dental structure (28) which can be attached to the cylindrical section of the abutment, wherein the dental structure is made of a dental material, and
• providing a machining tool or CAM device,
• wherein the abutment is mounted on the implant (40) via a releasable connection, having an anti-rotation mechanism (50), and an anti-rotation device (22) being configured between the abutment (10) and the dental structure (28),
• wherein the anti-rotation device forms at least one flute or groove (22) at the cylindrical section of the abutment (10), the at least one flute or groove, in cross-sectional view, curved concavely, the at least one flute or groove extends across at least a part of the height of the cylindrical section to a distal end of the abutment, both the top cylindrical section of the abutment and the at least one flute or groove ending at a rounded edge on the distal end,
• shortening the cylindrical section of the abutment with the machining tool or CAM device such that the at least one flute(s) or groove(s) is/are maintained with the rounded edge and a concave curve after shortening, wherein the shape of the cylindrical section is configured such that the radius of the cylindrical section remains unchanged when the cylindrical section is shortened.