An endosseous dental implant system has an externally threaded root-formed base 2 with self-tapping flutes 5 formed into apical threads of the root-formed base for easy insertion and immediate locking in an osteotomy. The coronal portion of the base has either a male or a female self-locking tapered friction held post that includes an apical anti-rotational polygon 7, 23 to lock a prosthetic attachment to the base once attached.