Implant unit

An implant unit comprising:

• a fixture that is capable of being assembled to an alveolar bone, wherein the fixture comprises:
• a body that is capable of being implanted and assembled to the alveolar bone and including a bump formed along outer circumferential surface of a top portion of the body;
• a settling portion that is capable of protruding out of an upper portion of the alveolar bone and extending from the body and including a first coupling structure;
• and
• a stress-reducing groove defined by a space formed in a depth direction of the body between the bump of the body and the settling portion, and the stress-reducing groove dispersing or absorbing a stress transmitted via the settling portion, by allowing a horizontal elastic deformation of the settling portion or a displacement of the fixture due to the stress in a direction vertical to a central axis of the fixture;
• and
• an abutment that comprises a first bump pattern being assembled to the settling portion of the fixture, a second bump pattern that is capable of being assembled to an artificial tooth or a crown and a second coupling structure being assembled to the first coupling structure of the settling portion,
• wherein, in a state where the settling portion and the abutment are assembled to each other, the stress-reducing groove is present between the bump and the settling portion,
• wherein the settling portion comprises a split rivet structure having a plurality of pieces apart from one another and extending from the body,
• wherein the plurality of pieces of the split rivet structure are elastically deformed while assembling the abutment to the fixture,
• wherein areas of the bump, which are capable of being implanted to the alveolar bone, are adapted to 3-dimensionally expand a contact area between the alveolar bone and the bump,
• wherein the bump has a diameter larger than a diameter of the abutment, and protrudes outward with respect to the abutment, and an upper surface of the bump has an exposed portion that is not covered by the abutment,
• wherein the settling portion further comprises an assembling groove formed in the split rivet structure, and a lower end of the stress-reducing groove is located at a position lower than a lower end of the assembling groove.