ROBERT D MASON
Paramedic in Tallahassee, FL

7677296, Mar 16, 2010

Mar 23, 2007

11/726905

Robert M. Mason - Tallahassee FL, US

Cloudland Institute LLC - Lookout Mountain GA

B22D 30/00, A61C 5/02

164122, 298961

An endodontic file () is provided particularly adapted for the removal of tooth structure, decayed or damaged nerve tissues or dentine material on the interior walls of a root canal or dentine and/or enamel from the external tooth wall. The endodontic instrument includes a shaft () having a shank portion () and a generally elongated working portion (). The working portion preferably includes cutting or abrading features () adapted upon rotation and/or reciprocation of the instrument to cut, abrade or remove tissue from the interior walls of a root canal or dentine and/or enamel from the external tooth wall. The working portion extends from a proximal end () adjacent the shank portion to a distal end () terminating at a tip (). The entire instrument and/or at least the working portion thereof is formed of an amorphous or essentially amorphous material having no or essentially no detectable crystalline structure and/or from a nanocrystalline material having an average crystalline grain size less than about 1 μm. The instrument may be formed by conventional grinding operations or by direct casting, forging or molding, in a manner producing an integral as-molded instrument having one or more sharp cutting edges.

2004012, Jun 24, 2004

Sep 3, 2003

10/654260

Robert Mason - Tallahassee FL, US

A61C005/02

433/102000

An endodontic file () is provided particularly adapted for the removal of tooth structure, decayed or damaged nerve tissues or dentine material on the interior walls of a root canal or dentine and/or enamel from the external tooth wall. The endodontic instrument includes a shaft () having a shank portion () and a generally elongated working portion (). The working portion preferably includes cutting or abrading features () adapted upon rotation and/or reciprocation of the instrument to cut, abrade or remove tissue from the interior walls of a root canal or dentine and/or enamel from the external tooth wall. The working portion extends from a proximal end () adjacent the shank portion to a distal end () terminating at a tip (). The entire instrument and/or at least the working portion thereof is formed of an amorphous or essentially amorphous material having no or essentially no detectable crystalline structure and/or from a nanocrystalline material having an average crystalline grain size less than about 1 m. The instrument may be formed by conventional grinding operations or by direct casting, forging or molding, in a manner producing an integral as-molded instrument having one or more sharp cutting edges. The instrument is inexpensive to manufacture and exhibits improved cutting-edge sharpness, wear resistance, lubriciousness and resistance to breakage.