Instrument for preparing the root-canal

Details Instrument for preparing the root-canal Instrument for preparing the root-canal

1994-05-13

1996-07-09

O'Connor, Cary E.

Dentistry

Apparatus

Broach

A61C 502

Patent

active

055338976

ABSTRACT:
The invention concerns a dental root-canal preparing instrument with a grip nd a tool held in the grip. The grip comprises a device indicating how often the instrument already was used. The device includes a displaceable element, such as a ring, shiftable along the grip into various discrete positions, with clearances such as annular channels being provided in axially spaced manner to receive the displaceable element. Following each use, the displaceable element is shifted ahead to another discrete position, whereby the number of uses already having taken place is indicated by the present position of the displaceable element.

REFERENCES:
patent: 4165562 (1979-08-01), Sarfatti
patent: 4368251 (1981-05-01), Takasugi et al.

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