Endodontic instrument

Details Endodontic instrument Endodontic instrument

1990-06-05

1991-07-30

Wilson, John J.

Dentistry

Apparatus

Broach

433164, 433 81, A61C 502, A61G 502

Patent

active

050356178

ABSTRACT:
An endodontic instrument having a rotatable shank and a working portion which extends along at least a portion of the length of the shank to a tip includes two continuous helical flutes which spiral along the length of the working portion. Each of the helical flutes has a shoulder which generally faces in the same direction along the length of the working portion as the shoulder of the other flute and which has a helical angle which is different from the helical angle of the shoulder of the other flute. In one embodiment, the instrument includes shoulders which generally face in the direction along the working portion toward the tip and is well-suited for thermomechanically condensing gutta-percha in a root canal of a tooth and for cutting dentinal chips from the wall of an extirpated root canal and transporting the cut chips to the terminus of the root canal system. In another embodiment, the instrument includes shoulders which generally face in the direction along the working portion away from the tip and is well-suited for extirpating a root canal as the working portion is either rotated or moved in inserting-withdrawal motions within the canal.

REFERENCES:
patent: 1307446 (1919-06-01), Kerr
patent: 1771182 (1930-07-01), Lentulo
patent: 1969808 (1934-08-01), Lentulo
patent: 4457710 (1984-07-01), McSpadden
patent: 4538989 (1985-09-01), Apairo, Jr. et al.
patent: 4634378 (1987-01-01), Leonard
patent: 4871312 (1989-10-01), Heath
patent: 4904185 (1990-02-01), McSpadden

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