Enossal single tooth implant with twisting prevention

A single tooth implant for a tightly fitting dental prosthesis, said implant comprising:

• a substantially cylindrical basic body insertable in a bore made in a jaw bone, said basic body having an axially extending blind bore extending from one end towards a second end to provide the body with a closed end at said second end and said one end having a coronal front edge extending between an outside surface of the basic body and the blind bore,
• a spacing sleeve having an axially extending passage being attachable to the coronal front edge of the basic body by means of an implant post insertable through the passage and into the blind bore, and
• means for preventing twisting between the spacing sleeve and the basic body,
• said blind bore of said basic body having a positive connection area adjacent the one end comprising at least one connecting element followed by a guidance area of a cylindrical surface which has a first diameter and merges into a centering area of a second diameter smaller than the first diameter,
• said spacing sleeve having a plug portion separated from a fastening end adapted for receiving the prosthesis by an annular shoulder receivable on the coronal front edge when the sleeve is mounted on the basic body with the plug portion inserted into the blind bore,
• said plug portion adjacent the annular shoulder having a positive connecting portion with at least one connecting element, a guidance portion spaced from the positive connecting portion towards an end of the plug portion and then a centering portion adjacent the end of the plug portion,
• said guidance portion of the plug portion having an outer diameter essentially matching the first diameter of the guidance area and said centering portion of the plug portion having an outer diameter essentially matching the second diameter of the centering area,
• said centering portion being receivable in the centering area of the blind bore of the basic body with the guidance portion received in the guidance area of the blind bore and the positive connection portion being disposed in the positive connection area of the blind bore as the shoulder of the spacing sleeve engages the coronal front edge,
• said means for preventing twisting comprising the connecting element of one of the sleeves and basic body being a groove and the connecting element of the other of the sleeve and the basic body being a projection receivable in said groove when the plug portion of the sleeve is inserted in the blind bore with the annular shoulder engaging the coronal front edge.