Endodontic files having variable helical angle flutes

Details Endodontic files having variable helical angle flutes Endodontic files having variable helical angle flutes

2007-09-18

2007-09-18

O'Connor, Cary E. (Department: 3732)

Dentistry

Apparatus

Broach

Reexamination Certificate

active

11366059

ABSTRACT:
A rotatable endodontic file for cleaning/shaping a tooth root canal, comprising an elongated shaft having a proximal end portion, a distal end and a tapered working portion having a rotational axis, the working portion extending from the proximal portion to the distal end, the external surface of the shaft working portion having a plurality of at least two spiraled, spaced apart continuous helical flutes, the flutes having therebetween an equal number of spiraled, spaced apart flanges, each flange having in a plane perpendicular the rotational axis an outer end surface forming a continuous spiraled scraping/cutting edge extending the length of the shaft working portion, the flutes having helical angles relative to the rotational axis of between 10° and 30° and wherein the helical angles vary at selected longitudinal locations.

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