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:
May. 20, 2003
Filed:
Sep. 26, 2001
Yuuki Oyamada, Morioka, JP;
Keisuke Ikushima, Tokyo, JP;
GC Corporation, Tokyo, JP;
Abstract
A dental diamond bur is provided, which is applicable for operations including from opening of a pulp chamber to spreading of a root canal orifice to any teeth of anterior teeth and molars; does not cut out a tooth orifice portion more than needed; cuts out a tooth orifice surface into a smooth curve surface form, thereby improving the adhesion between a filler and a tooth in that cut-out site; and is free from occurrence of perforation, in the root canal treatment. The dental diamond bur includes a tip portion that is a body of revolution with a convergent smooth curve, having a diameter in a shank portion side thereof of 0.5 to 0.8 mm and a height of 0.5 to 0.85 mm; and a diamond grains-attached portion that is a body of revolution with an externally convex curve from a rear end of the front end portion toward a shank portion, a maximum diameter portion of the diamond grains-attached portion being positioned in a range of 5.0 to 10.0 mm from the tip of the front end portion, and the tip portion side of the diamond grains-attached portion constituting a smooth surface in which diamond grains are slightly protruded from the shank portion side of the tip portion.