A sinus dental implant includes a main body, an external thread, and a plurality of spiral cutting flutes. The main body has opposite connection end and drilling end. The drilling end has a centered recess surrounded by a drilling zone and communicable with the spiral cutting flutes. The external thread and the spiral cutting flutes are extended in two different spiral directions. The drilling zone is divided by the spiral cutting flutes into a plurality of drilling segments, each of which has two sides located at different heights to thereby include a lower and an upper drilling portion. When the sinus dental implant is implanted into an alveolar hole to contact with a bottom thereof, the lower drilling portions at the drilling end cut the bottom of the alveolar hole slowly, so that the sinus dental implant can drill further in the alveolar hole instead of idling therein.

An externally threaded screw-type self-tapping dental implant includes: two or more external cutting grooves, at least one/one set that cuts in clockwise rotation of the implant, and at least one/another set, that cuts in counterclockwise rotation of the implant; and an internal passage in the implant that includes internal wrench-engaging surfaces and internal threads.

An apparatus and methods are provided for a one-step dental implant that avoids pressure points and heat production within a patient's bone. The dental implant includes a bone cutting portion having a centering tip surrounded by bone cutting edges and soft tissue knives. The centering tip perforates the gingiva while the soft tissue knives dissect the gingiva with a precise circular cut. The bone cutting edges chisel the bone as the dental implant is tightened into the bone. Deflecting sides direct bone powder into axial bone storage areas. A gingival sealing portion includes a cylindrical portion that fits into cortical bone without friction or exerting pressure on the bone. The cylindrical portion removably retains components that include a silicone O-ring. Engaging sections of the cylindrical portion enable driving the dental implant into the patient's bone. Internal threads of the cylindrical portion enable clamping abutments onto the dental implant.