| 摘要 |
A fixture is disclosed, in which a small thread part is formed at an upper side of a fixture, and a large thread part is formed at a lower side of the same, with the leads of the small and large thread parts being same, and with the small thread parts being not overlapped with each other, and with at least two thread parts being formed. When implanting a fixture into an alveolar bone, a cancellous bone with a smooth tissue contacts with a large tread portion of the fixture, so that an engagement force is enhanced. An alveolar bone contacts with a small thread part of the fixture, so that an engagement is enhanced. A bone destroy is prevented by continuously providing a certain stimulation to an alveolar bone. The fixture is stably fixed based on multi-step small thread parts. Since an upper side of the fixture is formed with a certain inclination, mixing of smooth tissue is basically prevented. A cut groove is formed at a lower side of the fixture for a self-tapping of the fixture.
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