Endodontic instrument and method of fabricating same using...

A - Human Necessities – 61 – C

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A61C 5/02 (2006.01) B21K 5/04 (2006.01)

Patent

CA 2261993

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.

Procédé de fabrication d'un instrument d'endodontie (10), selon lequel une ébauche métallique cylindrique (B) est tout d'abord forgée à froid dans un appareil d'emboutissage rotatif (26) de sorte qu'une partie terminale conique (35) soit obtenue. Cette partie (35) est ensuite usinée de façon qu'au moins une cannelure hélicoïdale (21, 22), qui définit une arête de coupe le long de chacun de ses bords latéraux (24), soit formée sur sa longueur. On a découvert que les opérations combinées de forgeage à froid et d'usinage permettent d'obtenir des instruments plus robustes que ceux produits par des techniques conventionnelles. Les instruments peuvent également être produits plus rapidement et à un coût moindre, ainsi que sans perte de matière brute.

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