| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a product that can be firmly fixed in a bone such as an alveolar bone without loosening, and enables the planting and removal to be performed precisely and easily, in a screw implant that can be used for orthodontics and surgery medical purpose, etc.SOLUTION: An area of a following side flank surface forming a screw thread is widened by one time to two times more than the area of an advancing side flank surface, and a taper angle in a taper shape with a screw front side tapered is 0.5°-5.0°. Also, the widening of the area of the following side flank more than the area of the advancing side flank is set by a flank angle and a screw depth of a thread, in which the advancing side flank angle is 5°-20° and the following side flank angle is 20°-40°, and a height of the screw thread is 10-25% less than the outer diameter of the screw thread in the immediate vicinity of the head.</p> |
