Rotary dental file having a safe breakage point

Details Rotary dental file having a safe breakage point Rotary dental file having a safe breakage point

2007-04-03

2007-04-03

Rodriguez, Cris L. (Department: 3732)

Dentistry

Apparatus

Broach

C433S165000, C433S166000

Reexamination Certificate

active

10836793

ABSTRACT:
An endodontic file (6) including a discontinuity (18) formed within the file shank (7). The discontinuity (18) creates a safe breakage point at which the file (6) will fail prior to a failure occurring at any other point along the length (11) of the file. The safe breakage point prevents the tip (21) of the file (6) from becoming irremovably embedded in a human tooth (12) after file failure. Substantially the entire length (11) of the file (6) remains connected to the tip (21) after file failure, thereby providing a considerable portion of the file which may be gripped and manipulated in order to accomplish file removal. Empirical data is presented to permit proper characterization of the region surrounding the discontinuity (18).

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patent: 6128966 (2000-10-01), Usui et al.
patent: 6955536 (2005-10-01), Buchanan
patent: 2002/0182565 (2002-12-01), Senia et al.

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