| 摘要 |
<p>A method of fabricating an endodontic instrument (10), wherein a cylindrical metal blank (B) is first cold forged in a rotary swaging machine (26) to form a tapered end portion (35). Thereafter, the tapered end portion (35) is machined to form at least one helical flute (21, 22) along its length, with the helical flute (21, 22) defining a cutting edge (24) along each side edge thereof. The combination of the cold forging and machining operations has been found to produce instruments which are stronger than instruments produced by conventional practices. Also, the instruments may be produced more quickly and thus at less expense, and they may be produced without loss of raw material.</p> |
