Fixture for anchoring in bone tissue
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United States of America Patent
Stats
-
Jun 28, 1994
Grant Date -
N/A
app pub date -
May 21, 1992
filing date -
May 25, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fixture intended to be implanted into bone tissue, for example, the bone tissue of a jaw, for anchoring a prothesis, such as a tooth crown. The fixture includes a cylindrical head disposed on the end of a shaft for positionally fixing the prothesis. An upper and lower external thread section is formed on the shaft. The lower external thread section is screwed into a previously prepared hole in the bone tissue, the hole having a diameter that is substantially equal to a core diameter of the shaft. A thread-free zone is located along a mid-section of the shaft. The thread-free zone has a smooth outer surface to avoid the irritation of nerves present in the bone tissue in the vicinity of the fixture. Gently curving transitional portions connect the thread-free zone with the upper and lower external thread sections. The thread-free mid-section and the lower external thread section are provided with a coating of tissue friendly material.
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