A dental implant of the present invention comprises: a first fastening part (150) formed by concavo-convex parts such as a fastening groove recessed in an outward direction at a predetermined position on an inner surface of a shaft hole of a fixture； and a first corresponding fastening part (130) formed on an outer circumferential surface of a fastening leg (122) of a lower fastening shaft part of an abutment, and formed by a fastening protrusion complementarily joined to the first fastening part (150) formed on the inner surface of the shaft hole of the fixture, wherein in the state where the abutment is engaged in the fixture by the complementary engagement of the first fastening part (150) and the first corresponding fastening part (130), a function to prevent rotation of the abutment against the fixture is performed at a rotational force of less than a predetermined level, while at a rotational force of more than a predetermined level, the fastening leg of the lower fastening shaft part of the abutment is elastically bent in an inner diameter direction, and the abutment is rotated in a circumferential direction so that the fastening protrusion of the first corresponding fastening part is separated from the fastening groove of the first fastening part, thereby separating the fixture from the abutment.La présente invention concerne un implant dentaire qui comprend : une première partie de fixation (150) formée par des parties concavo-convexes, telles qu'une rainure de fixation renfoncée dans une direction vers l'extérieur dans une position prédéterminée sur une surface interne d'un trou d'arbre d'un corps d'implant ； et une première partie de fixation correspondante (130) formée sur une surface circonférentielle externe d'une patte de fixation (122) d'une partie d'arbre de fixation inférieure d'une butée, et formée par une saillie de fixation reliée de manière complémentaire à la première partie de fixation (150) formée sur la surface interne du trou d'arbre du co
