Metal tools and implements – making – File cutting – Process
Patent
1985-05-14
1986-09-16
Parker, Roscoe V.
Metal tools and implements, making
File cutting
Process
76101D, B24B 326
Patent
active
046115080
ABSTRACT:
An improved endodontic instrument includes a tapered working portion defined on a flexible shaft. The working portion includes a plurality of spiral rotationally bi-directional cutting edges thereon. The instrument includes a tapered tip defined on the flexible shaft and intersecting an end of each of the cutting edges of the working portion. The tapered tip has a greater angle of taper than does the tapered working portion. The tapered tip is shaped such that the sharp cutting points which are normally present at an intersection between the ends of the cutting edges and a standard 75.degree. included angle conically tapered tip are substantially eliminated so that lateral transportation of the instrument when cutting a curved root canal is reduced as compared to an otherwise similar instrument having a standard 75.degree. included angle conically tapered tip.
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Brochure of Unitek Corporation entitled "Unitek's New Generation Endodontic Files and Reamers", 1980.
Endodontics, Second Edition, John Ide Ingle, D.D.S., M.S.D., and Edward Edgerton Beveridge, D.D.S., M.S.D., pp. 168-215 (1976).
Franklin S. Weine, D.D.S., M.S.D.; Robert F. Kelly, D.D.S.; and Peter J. Lio, D.D.S., M.S., Maywood, Illinois, Journal of Endodontics, "The Effect of Preparation Procedures on Original Canal Shape and on Apical Foramen Shape", vol. 1, No. 8, Aug. 1975, pp. 255-262.
Franklin S. Weine, D.D.S., M.S.D.; Robert F. Kelly, D.D.S.; and Kenneth E. Bray, D.D.S., M.S., Maywood, Illinois, Journal of Endodontics, "Effect of Preparation with Endodontic Handpieces on Original Canal Shape", vol. 2, Nos. 10, Oct. 1976, pp. 298-303.
Exhibit A, Photograph of Unitek Brand Size 70 File.
Exhibit B, Photograph of Kerr Brand Size 70 File.
Exhibit C, Photograph of Star Brand Size 25 File.
Exhibit D, Photograph of Star Brand Size 70 File.
Exhibit E, Photograph of Star Brand Size 40 Reamer.
Exhibit F, Photograph of Star Brand Size 70 Reamer.
Exhibit G, Photograph of Union Broach Brand Size 55 File.
Exhibit H, Photograph of Healthco Brand Size 35 File.
Exhibit I, Photograph of Hygenic Brand Size 35 File.
Exhibit J, Photograph of Kerr K-Flex Brand Size 70 File.
Exhibit K, Photograph of Union Broach Brand Size 80 File.
Exhibit L, Photograph of Burns Unifile Brand Size 60 File.
Exhibit "A" to Supplemental Information Disclosure Statement--English Translations of certain portions of German Pat. No. 2,935,998.
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