A dental implant system has an implant member, an abutment member and a transfer key with cooperatively engaging structures for aligning and orienting an abutment assembled on the implant member and for preparing a dental impression and mold which represents the implantation site and its relationship to adjacent teeth structures. The dental implant system includes an O-ring type abutment assembly with a reduced footprint, a surgical screw and bone screw insertion tool, a healing abutment that need not be removed during an impression taking procedure, and an implant coding system for selecting and identifying dental implants and implant analogs.