Endodontic dental instrument

Details Endodontic dental instrument Endodontic dental instrument

1991-04-03

1992-04-21

Mancene, Gene

Dentistry

Apparatus

Broach

A61C 502

Patent

active

051062984

ABSTRACT:
An endodontic instrument is disclosed which comprises an elongate shank having a lower working length. One or more helical flutes are positioned on the working length, and the bottoms of the flutes define a solid core which is cylindrical in one embodiment, and reversely tapered in another embodiment. The solid core permits the working length to permanently twist upon becoming locked in the canal during root canal therapy, and the twists move upwardly from the point of locking engagement until they may be visually and/or tactilely noted by the dentist, and so that the dentist is alerted before breakage occurs.

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patent: 4934934 (1990-06-01), Arpaio, Jr. et al.

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