A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
83/15
A61C 3/00 (2006.01) A61C 5/04 (2006.01)
Patent
CA 1192426
DENTAL INSTRUMENT ABSTRACT OF THE DISCLOSURE An instrument particularly adapted for thermomechanically condensing a thermoplastic material such as gutta percha in the root canal of a tooth through the rotative action of the instru- ment is disclosed. The instrument comprises an elongated member including a shank at one end and a working portion at its other end. The working portion is tapered along at least part of its length. The working portion includes at least two oppositely disposed, continuous helical flutes formed in at least a portion of the tapered length of the shank defining at least two oppositely disposed helical shoulders. The shoulders face away from the shank and make an angle with the longitudinal axis of the working portion of from about 90° to 80° and each of the continuous spiraled flutes make from about 1.0 to 3.5 spirals per millimeter along the longitudinal axis of the working portion of the instrument. Preferably, the tapered end of the working portion is provided with a generally cylindrical, smooth walled pilot having a generally blunt end projecting coaxially from the tapered end of the working portion.
411308
Dentsply International Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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