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:
Aug. 22, 2000
Filed:
Jul. 18, 1997
William B Johnson, Tulsa, OK (US);
Tulsa Dental Products Inc., Tulsa, OK (US);
Abstract
A method of cleaning and shaping a root canal in a tooth in preparation for filling the root canal with a filler material, such as gutta percha, as a part of an endodontic procedure includes the step of inserting into the root canal a tapered file having a spiraled scraping edge formed thereon, the scraping edge having a neutral rake angle, the file having a taper of about 0.04% such that, as a sequence of files of the same characteristics but having different tip diameters are employed, the root canal is shaped and cleaned from the coronal area towards the tooth apex in contrast to the traditional endodontic procedure wherein root canals have been shaped and cleaned in the step back method beginning with the root canal apex and progressing towards the coronal area.