| 摘要 |
<p>[Problem] To provide an implant screw, whereby it becomes possible to reduce the period between the time of the completion of the implantation of the implant screw into a bone tissue and the time of the occurrence of regeneration of a bone to fix the implant screw to the bone. [Solution] The present invention is an implant screw which has a screw shaft part (3) having a screw thread (3b) formed on the outer periphery thereof, in which the screw shaft part (3) is screwed into a bone in a living body so as to bond the implant screw to the bone. The screw shaft part (3) has a shaft main body (3a) of which the transverse section perpendicular to the shaft axis line has a polygonal shape such as a triangular shape, and the screw thread (3b) is formed spirally and integral with the surface of the shaft main body (3a). This constitution enables the reduction of the mechanical stress against a bone in a site (3s) corresponding to a side of the polygonal shape which is not in contact with the bone, and therefore also enables the early bone regeneration in the site after the implantation of the implant screw into the bone.</p> |
