| 摘要 |
This invention relates to a dental reamer used in dental treatment for forming a root canal, in which the dental reamer prevents digging into a root canal wall and deviation even when attached to a handpiece and driven by an engine. With this reamer, a spiral working portion is formed by grinding and cutting away a tapered rod with two oppositely faced lines, and then, the ground material left with two arcs and a center of a circle is inserted into a molding space comprised of a pair of holding jigs and support jigs to perform the twist-process. In association with the twist-process, a cutting portion and a flank portion are formed on both ends of the working portion. <IMAGE> |
