Abstract: A dental implant (1) has a cylindrical body (2), with a rounded apical end (3) provided with formations (4, 5, 6, 7, 8) permitting internal bony regeneration firmly securing the implant (1). A basal end (9) forms a polygonal nut (10). The cylindrical body (2) has a succession of alternate flat parts (15, 16, 17, 18) and externally screw-threaded parts (11, 12, 13, 14), extending lengthwise of the body of the implant (1). The external threading increases the contact surface with the bone (20). The threaded parts (11, 12, 13, 14) are disposed at the periphery of circular sectors of the cylindrical body (2) and the flat parts (15, 16, 17, 18) are provided by the bottoms of longitudinal grooves. There are two wide threaded parts (11, 12) for self-tapping and/or retention in already-tapped bone (20) and two narrow threaded parts (13, 14) serving as guide rails during impacting and permitting the escape of chips during self-tapping.