A dental implant comprising an implant body which has an asymmetric root portion receivable in an asymmetric open root cavity of the patient and engagement means on the asymmetric root portion to at least in part engage a surface of the root cavity so as to prevent or inhibit unintentional extraction. The asymmetric root portion is complementarily shaped to fit the said asymmetric open root cavity, thus substantially dispensing with the need for protracted preparation of the root cavity and providing substantially immediate stability for the prosthetic tooth.
