| 摘要 |
A dental implant including an engagement portion provided in a head portion to be engaged with an engagement member to rotate the parts, wherein the engagement portion is a hole having a lateral cross-sectional shape of double squares in which two squares with the same shape having a common central axis are superimposed at a relative angle of from 20° to 45°. By use of the dental implant, even when an engagement portion provided in a head portion to be engaged with an engagement member to rotate the parts is partly damaged by an excessive torque or the like at the time of operation once effected, it is possible to fasten again the parts with the screw and release the parts from the screw, and the operability during engagement with the engagement member is good. |
