A dental implant includes a fixture, an abutment, and a male screw. The fixture includes a lower part, which includes a screw portion and is to be inserted into alveolar bone, an intermediate part which is to come into contact with gingiva, and an upper part which partially or entirely protrudes from the gingiva when the implant is implanted and is coupled with a dental prosthesis. Particularly, a polygonal protruding portion is provided at a top of the upper part of the fixture, which protrudes from the gingiva, and a polygonal insertion portion, into which the polygonal protruding portion is inserted, is formed at a bottom of the abutment coupled with the fixture.
