| 摘要 |
<p>PURPOSE:To improve a stress dispersing effect to a jaw bone by setting, in a specified range, an angle of the screw head of the screw part of an artificial root of a tooth provided with the screw part implanted in the jaw bone. CONSTITUTION:An artificial root 1 of a tooth is provided with a root part 3 provided with a screw part 2 implanted in a jaw bone, a head part 4 attached with a technical material and a neck part 5 connecting the root part 3 to the head part 4, preferably the root part 3 and the head part 4 are integrally molded as one axis. The root part 3 is provided with a hollow axis body 6 and a spiral- shaped screw part 2 projectingly formed on its perimeter and the screw head angle of the screw part 2 is set in a range from 60 deg. to 70 deg.. The axis body 6 is provided with a central hole 7 and window parts 8 are openingly formed on its right and left sides. And attaching sites of the neck of the neck part 5 with the head part 4 and with the root part 3 are made taper parts 9 which expand gradually toward the head part 4 and the root part 3. Thus, uniform stress dispersion is designed by bufferizing a load like occlusion power or the like appropriately and decreasing the stress concentration of the screw head tip part.</p> |
