Metal working – Method of mechanical manufacture – Dental appliance making
Reexamination Certificate
2008-07-15
2008-07-15
Bryant, David P. (Department: 3726)
Metal working
Method of mechanical manufacture
Dental appliance making
C433S102000, C216S091000
Reexamination Certificate
active
10991178
ABSTRACT:
A method of manufacturing endodontic files involves a chemical milling process to yield endodontic files having a desired taper and/or degree of sharpness. The process involves the steps of (a) forming helical cutting edges in the cutting portion of the metallic rod; and (b) chemically milling the cutting portion of the rod so as to sharpen and/or taper the cutting portion. The rod may be formed of any desirable metallic material, for example stainless steel or a nickel-titanium alloy. The cutting edges may be formed by torsioning, cutting, grinding, machining, laser micromachining, or grit blasting.
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Fischer Dan E.
Hobson Barry L.
Lewis Paul
Afzali Sarang
Bryant David P.
Ultradent Products Inc.
Workman Nydegger
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