The present invention relates to a dental implant comprising: a fixture forming an artificial dental root implanted in an alveolar bone and an abutment having the bottom portion thereof coupled to the fixture and the top portion thereof coupled to a crown wherein the fixture and the abutment are resiliently coupled. The fixture has a sloped surface formed by the inner diameter of an arbor hole which decreases in diameter progressively downward from a certain position on the inner surface of the arbor hole and has a first fastening portion formed of at least one concave portion such as a fastening recess along the circumferential direction of the arbor hole from a certain position on the sloped surface. The abutment has a first corresponding fastening portion formed on a lower fastening shaft portion thereof and formed of fastening protrusions that are complementarily coupled to the first fastening portion of the fixture. The present invention provides a dental implant configured such that in a state in which the abutment is coupled inside the fixture by means of the complementary coupling of the first fastening portion and the first corresponding fastening portion when the abutment is rotated in a circumferential direction and the first corresponding fastening portion is disengaged from the first fastening portion the fastening protrusions of the first corresponding fastening portion through the effect of elastic resistance against the sloped surface of the inside of the fixture arbor hole pushes and raises the abutment upward from the fixture and automatically separates the abutment and the fixture.
