The present invention relates to a fixture which is placed in an alveolar bone to form an artificial root and an upper part is combined with a prosthesis (crown or denture) and a lower end is resiliently deformed by a resilient bending and restoring force in a central axis direction The dental implant according to claim 1, wherein the first fastening part (150) comprises a concave-convex part such as a concave part recessed outward at a predetermined position of the inner surface of the shaft hole of the fixture, A first corresponding coupling part 130 composed of a coupling protrusion complementary to the first coupling part 150 formed on the inner surface of the shaft hole of the fixing body is formed on the outer circumferential surface of the coupling leg 122 of the lower coupling shaft part , The first fastening portion is formed at least one along the circumferential direction of the inner surface of the shaft hole of the fixture and is not formed in a ring shape over the entire circumferential direction, When the abutment is pushed into the shaft hole of the fixed body and fastened, the abutment is fastened to the fastening body only at a certain angle, and when the abutment is rotated in the circumferential direction by a certain rotational force, And the abutment of the first abutment portion 150 and the first abutting engagement portion 130 prevents the abutment rotation against the abutment against the abutment against the abutting abutment against the abutting abutment And the fastening legs of the lower fastening shaft portion of the abutment portion are elastically bent in the inner diameter direction when the rotation force is greater than a predetermined level and the abutment protrusion of the first corresponding fastening portion rotates in the circumferential direction, Thereby separating the fixture from the groove and separating the fastener from the fastener.본 발명은 치조골에 식립되어 인공치근을 형성하는 고정체(fixture)와, 상단부는 보철물(Crown 또는 Denture)과 결합되고 하단부는 중심축 방향으
