Abstract: The present invention is directed to developments in the fields of dentistry and dental surgery, and particularly to an improvement in dental restoration apparatus. Typically, apparatus of this type includes an implant adapted to be implanted in an anchor site fashioned within the bone of the jaw of the patient. In addition, the apparatus includes an abutment ultimately providing support for a tooth restoration. Finally, the apparatus includes a fastener assembly for engaging both the implant and abutment in their mounted orientation, and securing the two structures together in a manner to positively resist relative movement both axially and rotationally.