An implant (10) includes an implant base having a predetermined diameter, a positioning thread (12) spirally upwardly extended around the periphery thereof and gradually reducing in width in direction from the implant root (11) toward an opposing top side thereof to form a gum-drilling structure, a plurality of spiral grooves (13) equiangularly and upwardly extending around the periphery thereof across the positioning thread to form a plurality of cutting edges (14) at the positioning thread (12) at different elevations, and an arc top (15) located at the top side thereof. The diameter of the implant root (11) and the number of the spiral grooves (13) are determined subject to a predetermined ratio so that the implant (10) can be conveniently and rapidly driven into the dental bone (20) to simultaneously propel the applied bone growth powder/biomedical (22) filler into place, assuring a high level of implant reliability.
