The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2001
Filed:
Oct. 26, 1999
Applicant:
Inventors:
Farrokh Farzin-Nia, Inglewood, CA (US);
William Otsen, Glendora, CA (US);
Assignee:
Ormco Corporation, Orange, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61C 5/02 ;
U.S. Cl.
CPC ...
A61C 5/02 ;
Abstract
A method of forming a superelastic endodontic file by grinding a superelastic wire to form a file blank, and rotating a first end of the blank while preventing rotation of a second end of the blank is disclosed. The file blank is maintained in the austenite phase until twisted to form a stress induced martensite which is plastically deformed by the twisting. A heat treatment step may be performed prior to twisting, during twisting or after twisting of the preform. The method disclosed allows for increased flexibility in the design of files including the production of a rhomboid superelastic file.