| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a dental root extruder which is small in the difference in magnetic attraction force between gaps 0.2 and 0 mm during an extrusion period, does not incur damage between the dental root and the gingiva, is short in the dental root extrusion period, facilitates keeper adjustment and does not corrode a permanent magnet. SOLUTION: The dental root extruder which is arranged to face the keeper fixed to the dental root and extrudes the dental root by the magnetic attraction force consists of an attraction part 2 and a holder for holding this attraction part 2 at a prescribed position. The attraction part 2 consists of the permanent magnet 21, a nonmagnetic casing 22 consisting of a corrosion resistant nonmagnetic material covering the flanks of this permanent magnet 21 and the opposite surfaces of the keeper and a gap adjusting cap 23 consisting of a corrosion resistance nonmagnetic material which covers the flanks of the nonmagnetic casing 22 and the rear surface of the permanent magnet and is disposed to have a spacing 230 with the rear surface 210 of the permanent magnet 21.</p> |
