Method for manufacturing endodontic instruments
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61C-005/02
B23P-013/00
출원번호
US-0436938
(2003-05-13)
발명자
/ 주소
Lewis, Paul
Hobson, Barry L.
출원인 / 주소
Ultradent Products, Inc.
대리인 / 주소
Workman Nydegger
인용정보
피인용 횟수 :
2인용 특허 :
13
초록▼
A method of manufacturing endodontic files involves a chemical milling process to yield endodontic files having a desired taper. The process involves the steps of (a) providing a metallic rod having a cutting portion with a polygonal cross section; (b) torsioning the rod so as to form helical cuttin
A method of manufacturing endodontic files involves a chemical milling process to yield endodontic files having a desired taper. The process involves the steps of (a) providing a metallic rod having a cutting portion with a polygonal cross section; (b) torsioning the rod so as to form helical cutting surfaces in the cutting portion of the metallic rod; and (c) chemically milling the cutting portion of the rod so as to taper the cutting portion. The rod may be formed of any desirable metallic material, for example stainless steel or a nickel-titanium alloy.
대표청구항▼
1. A method of manufacturing an endodontic instrument for use in performing an endodontic procedure, comprising:(a) forming an intermediate instrument having a cutting portion by at least one of (i) torsioning a metallic rod having a polygonal cross section or (ii) cutting, grinding, laser micromach
1. A method of manufacturing an endodontic instrument for use in performing an endodontic procedure, comprising:(a) forming an intermediate instrument having a cutting portion by at least one of (i) torsioning a metallic rod having a polygonal cross section or (ii) cutting, grinding, laser micromachining, machining, or grit blasting a metallic rod; and(b) chemically milling at least said cutting portion of said intermediate instrument so as to yield an endodontic instrument having a desired taper.2. The method as recited in claim 1, wherein at least a portion of said cutting portion is formed by (c) torsioning a metallic rod having a polygonal cross section so as to form helical cutting edges in said cutting portion.3. The method as recited in claim 2, wherein said polygonal cross section is at least one of a square, a triangle, a polygon having straight surfaces, a polygon having concave surfaces, or a polygon having convex surfaces.4. The method as recited in claim 2, wherein said metallic rod is heated prior to and/or during torsioning.5. The method as recited in claim 4, wherein said metallic rod is heated by RF high frequency induction heating.6. The method as recited in claim 4, wherein said heating is performed in an inert environment.7. The method as recited in claim 6, wherein said inert environment comprises at least one noble gas.8. The method as recited in claim 1, wherein at least a portion of said cutting portion is formed by at least one of cutting, grinding, laser micromachining, machining, or grit blasting.9. The method as recited in claim 1, wherein said chemical milling is performed by progressively inserting and/or withdrawing said cutting portion from a chemical milling composition at a predetermined rate.10. The method as recited in claim 9, wherein said chemical milling composition is acidic.11. The method as recited in claim 10, wherein said chemical milling composition comprises one or more of hydrofluoric acid, nitric acid, water, and a wetting agent.12. The method as recited in claim 9, wherein said chemical milling composition is maintained at a temperature between about 15° and about 105° C.13. The method as recited in claim 9, wherein said chemical milling composition is maintained at a temperature between about 25° and about 90° C.14. The method as recited in claim 9, wherein said chemical milling composition is maintained at a temperature between about 35° and about 65° C.15. The method as recited in claim 9, further comprising soaking at least said cutting portion in said chemical milling composition for a predetermined soak time of between about 1 minute and about 60 minutes.16. The method as recited in claim 15, wherein said soak time is between about 3 minutes and about 30 minutes.17. The method as recited in claim 15, wherein said soak time is between about 5 minutes and about 20 minutes.18. The method as recited in claim 9, wherein said cutting portion of said rod is inserted and/or withdrawn from said chemical milling composition at a rate of between about 0.1 mm per minute and about 6 mm per minute.19. The method as recited in claim 9, wherein said cutting portion of said rod is inserted and/or withdrawn from said chemical milling composition at a rate of between about 0.5 mm per minute and about 3 mm per minute.20. The method as recited in claim 9, wherein said cutting portion of said rod is inserted and/or withdrawn from said chemical milling composition at a rate of between about 0.8 mm per minute and about 1.2 mm per minute.21. The method as recited in claim 1, wherein said chemically milling produces a cutting portion taper of between about 0.02 mm/mm and about 0.06 mm/mm.22. The method as recited in claim 21, wherein said chemically milling produces a cutting portion taper of about 0.0225 mm/mm.23. The method as recited in claim 1, wherein said chemically milling sharpens the cutting surfaces of said cutting portion as said cutting portion is chemically milled.24. The method as recited in claim 1, wherein said chemically milling comprises chemically milling a plurality of intermediate instruments simultaneously.25. A method of manufacturing an endodontic instrument for use in performing an endodontic procedure, comprising:(a) torsioning a metallic rod having a polygonal cross section so as to form an intermediate instrument having a cutting portion with helical cutting edges in said cutting portion; and(b) chemically milling at least said cutting portion of said intermediate instrument so as to yield an endodontic instrument having a desired taper.26. The method as recited in claim 25, wherein said chemically milling sharpens said helical cutting edges as said cutting portion is chemically milled.27. The method as recited in claim 25, further comprising subjecting said metallic rod to at least one of cutting, grinding, laser micromachining, machining, or grit blasting.28. A method of manufacturing an endodontic instrument for use in performing an endodontic procedure, comprising:(a) forming an intermediate instrument having a cutting portion from a metallic rod, at least said cutting portion formed by at least one of cutting, grinding, laser micromachining, machining, or grit blasting; and(b) chemically milling at least said cutting portion of said intermediate instrument so as to yield an endodontic instrument having a desired taper.29. The method as recited in claim 28, wherein said chemically milling sharpens cutting edges of said cutting portion as said cutting portion is chemically milled.30. The method as recited in claim 28, further comprising torsioning said metallic rod to yield helical cutting edges.
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이 특허에 인용된 특허 (13)
Coggins ; Dolphus L. ; Gumbelevicius ; John, Chem-milling of titanium and refractory metals.
Tumminaro ; Jr. Anthony J. (P.O. Box 105 Gardena ND 58739), Solution and process for chemically resharpening smoothing tools, forming tools and cutting tools.
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