| 摘要 |
A dental reamer/file instrument having an elongated shank having a proximal end portion, a distal end and an intermediate tapered working portion, the external surface of the shank working portion having three continuous equally spaced helical flutes forming three spiral flanges, each of which, in a plane perpendicular to the length of the shaft is defined in part by a triangular outer working portion having a base width of "A", an apex of each triangular outer portion forming a cutting/scraping edge, each triangular outer working portion being integrally connected to the central core portion by a reduced width neck portion of width "B" and wherein "A" is greater than "B", the triangular outer working portions being rotational flexibility within elastic limits relative to the shaft central core portion.
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