EP1357851A2 - Limes dentaires a angles de depouille multiples - Google Patents

Limes dentaires a angles de depouille multiples

Info

Publication number
EP1357851A2
EP1357851A2 EP02707719A EP02707719A EP1357851A2 EP 1357851 A2 EP1357851 A2 EP 1357851A2 EP 02707719 A EP02707719 A EP 02707719A EP 02707719 A EP02707719 A EP 02707719A EP 1357851 A2 EP1357851 A2 EP 1357851A2
Authority
EP
European Patent Office
Prior art keywords
file
taper
files
flute portion
flute
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02707719A
Other languages
German (de)
English (en)
Other versions
EP1357851A4 (fr
Inventor
Leonard Stephen Buchanan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1357851A2 publication Critical patent/EP1357851A2/fr
Publication of EP1357851A4 publication Critical patent/EP1357851A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/40—Implements for surgical treatment of the roots or nerves of the teeth; Nerve needles; Methods or instruments for medication of the roots
    • A61C5/42—Files for root canals; Handgrips or guiding means therefor

Definitions

  • the present invention relates generally to endodontic instruments and, more particularly, to root canal files used in the cleaning of material present in the root canal of a human tooth and for enlarging and shaping the root canal so that it may be prepared for filling.
  • a relatively common but difficult dental procedure is the shaping, cleaning, and filling of the root canal of a patient's tooth.
  • a hole is first cut in the crown or exposed portion of the tooth, typically either in the biting surface of the tooth, for posterior teeth, or in the side of the tooth on the interior of the jaw for incisor teeth.
  • Small endodontic instruments known generally as root canal files are then used to clean out the material present in the root canal, and to impart a tapered shape to the root canal so that filling material may be inserted into the root canal to seal it.
  • each file in one set of the known prior art has an identical taper from one end to the other of the cutting flutes portion.
  • the taper is 0.32 millimeters on every file over the standard 16 mm length of cutting flutes, or 0.02 mm of taper/mm of flute length. This taper is sometimes referred to as a standard ISO (International Standards Organization) taper.
  • the size number characterizing the file is the diameter of the file at the tip in hundredths of a millimeter, and the diameter of the file at the large end is thus 0.32 millimeters greater than this tip diameter.
  • a complete set will include sizes 06, 08, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 110, 120, 130, and 140, while sizes 08-60 will typically be used.
  • Some manufacturers make certain half-sizes, or off-standard sizes. Root canals are seldom straight and there is always the possibility of causing irreversible damage to roots and root canals during shaping procedures, depending on the thinness of the root and severity and location of the root canal curvatures. If too large a file is advanced too far into a curved root canal, it may easily cut through the side of the root, which is referred to as a perforation of the root, and usually the tooth must then be extracted.
  • step-back One technique used with a conventional set of files having identical tapers to clean and shape the root canal is referred to as the "step-back" technique.
  • a series of file sizes from 08 to 60 (12 instruments) are introduced into the canal from smallest to largest with each successively larger file being used farther back from the end of the canal.
  • Gates-Glidden or Peezo burs are similarly used in this step-back manner, comprising a total of 16 to 18 instruments.
  • step-back procedure An improvement of the step-back procedure is disclosed in my patent 6,053,735, entitled ROOT CANAL PREPARATION METHOD, the disclosure of which is incorporated herein by reference as though set out in haec verba.
  • the disclosed improved endodontic procedure includes using either files or burs in a first crown-down procedure, then using the instruments in a reverse sequence in a serial step-back procedure, followed by finishing preparation of the root canal with selected instruments in a second crown-down procedure.
  • Either conventional root canal files of standard taper or variably-tapered files may be used.
  • the Greater Taper SystemTM includes sets of shaping files with similar non-ISO tapers which vary by evenly or proportionally increasing tip diameters.
  • shaping files of the Greater Taper SystemTM can be safely used in curved canals and/or thin roots in spite of their greater rates of taper. This is accomplished very effectively by the specification of progressively shorter flute lengths as files in a set have progressively greater tapers, thereby limiting their maximum flute diameters. Without this feature, the shank-end flute diameters of variably-tapered shaping files become wider and stiffer as the tapers of these instruments increase, and their potential for lateral perforation or weakening of the root increases as well.
  • I . . . . shank which substantially improve efficiency in preparing a root canal.
  • This multi-tapered file can be used to advantage in each of the procedures described hereinabove, as well as in other procedures in the general field of endodontics.
  • particular arrangements of the present invention comprise tapered root canal files having at least two different angles or degrees of taper along different portions of their flute sections.
  • one particular file in accordance with the present invention comprises a first portion adjacent the tip of the file which has a 0.12 taper. This extends over a selected distance back from the tip to a second portion adjacent the shank in which the taper changes to a 0.02 taper (the standard ISO taper) .
  • This file is one of a set of four, all having the same lengths from file to file for the first and second portions, respectively, and the same 0.02 taper for the second portions, but in which the taper of the first portion diminishes from file to file.
  • the first file is that having the 0.12 taper for the first portion.
  • the next file has 0.10 taper for the first portion with the third and fourth files having a first portion taper of 0.08 and 0.06, respectively.
  • a second set of files is exactly like the just- mentioned set in all respects except for the taper in the second portion being established at 0.04 mm/mm. For purposes of distinguishing nomenclature, these two sets of files will be designated as being in a first Group of files.
  • a third Group comprises a single set of four files which, like the first Group files, have equal lengths from file to file of the first and second portions respectively.
  • the taper of the second portion varies inversely with the variation in taper of the first portion from file to file. That is, as the taper of the first portion of the Group III files diminishes from 0.12 for the first file through 0.10 and 0.08 to 0.06 for the fourth file, the taper of the second portion increases from 0.01 mm/mm for the first file through 0.02 and 0.03 to 0.04 mm/mm for the fourth file.
  • the files of a fourth Group are like the files of the second Group in that the lengths of the first and second portions vary from file to file; i.e., beginning with the first file, which has the shortest first portion and thus the longest second portion, the length of the first portion increases from file to file while the length of the second portion decreases correspondingly.
  • the taper of the first portion reduces from file to file, starting with a 0.12 taper, and reducing progressively to 0.06 taper in the fourth file.
  • the taper of the second portion increases from file to file as the taper of the first portion reduces.
  • the tapers of the second portion are increasing from file to file.
  • the taper of the second portion is 0.01.
  • the taper of the second portion is 0.02.
  • the second portion taper is 0.03.
  • the fourth file has a first portion taper of 0.06 while the taper of the second portion is 0.04.
  • arrangements in accordance with the present invention provide multi-tapered sets of four files each. They may extend to sets of five or six, where appropriate. For purpose of disclosure, these are organized in Groups I-IV. Some of the Groups comprise two sets of files; some comprise a single set, each having at least two portions of distinctly different tapers. In each set, the tapers of the first portions vary from one file to the next, beginning with a taper of 0.12 for the maximum taper file and decreasing successively through 0.10 and 0.08 to the minimum taper file of 0.06 in the first portion. Where the sets extend to five or six files, the minimum taper of the first portion is 0.04 or 0.02, respectively. In Groups I and II, one set comprises files having a standard taper of 0.02 in the second portions thereof, while the other set provides a taper of 0.04 in the second portions of the files.
  • the groups may also be distinguished by the respective lengths of the two portions of a particular file.
  • the first portions of the files are all the same length.
  • the lengths of the second portions are also consistent from file to file.
  • the length of the first portion is shortest for the greatest taper (0.12) and increases correspondingly as the taper of the first portion of the files reduces to the minimum taper at 0.06, with the lengths of the second portions being adjusted accordingly.
  • the tapers of the second portions of the files in a given set are not fixed but vary inversely with the tapers of the first portions; i.e., as the tapers of the first portions reduce from file to file, the tapers of the second portions increase.
  • this multi-taper feature in the various versions described above in files having various types or forms of flutes, such as the K-type files and the Hedstrom-type files described hereinabove.
  • the multi-taper feature of the present invention may be incorporated in files having one or more helicoidal flutes or in files having at least a single axial cutting edge.
  • One particular benefit of these particular arrangements in accordance with the present invention stems from their ability to clean out and shape the coronal portion of a root canal, after which the flute portion adjacent the shank takes over the shaping of the remaining portion of the root canal, maintaining the desired taper of the second portion of the selected file as the file is moved farther into the root canal.
  • FIG. 1 is a schematic view of a root canal in a tooth, with a portion to be removed during root canal shaping procedures shown in broken lines;
  • FIG. 2 shows a conventional ISO file of the prior art
  • FIGS. 3A-3D are schematic views of a first Group of four multi-taper files in accordance with the present invention.
  • FIGS. 4A-4D are schematic views of a second Group of four multi-taper files in accordance with the present invention.
  • FIGS. 5A-5D are schematic views of a third Group of four multi-taper files in accordance with the present invention.
  • FIGS. 6A-6D are schematic views of a fourth Group of four multi-taper files in accordance with the present invention.
  • FIGS. 7A-7D are schematic cross-sectional views of four different cross-sectional shapes for the cutting flutes of the multi-taper files of the present invention.
  • a tooth 10 is shown located in the bone 12 of a patient's jaw.
  • the tooth 10 is an incisor, and the opening in the crown of the tooth 10 is cut on the side of the tooth in the interior, which opening is generally indicated at 14.
  • the tooth 10 has a nerve canal 16 extending to the tip of the tooth which is embedded in the bone 12. In the preparation of a root canal, the nerve canal 16 and surrounding portion within the broken outline 14 is to be removed, for subsequent filling with materials used in completion of the root canal.
  • FIG. 2 shows a conventional root canal file of the prior art having a handle 22 supporting the file 20.
  • the file has a flute length X, a shank diameter Y and a tip diameter Z.
  • X 16 mm
  • Y 0.32 mm plus Z
  • Z varies with the size of the file, beginning at 0.06 mm for the smallest file and increasing to 1.4 mm for the largest file.
  • the smallest file has a sharp tip 24, which is needed since each successive file in the series has a larger diameter at the tip.
  • FIGS. 3A-3D schematically represent sets of four multi-tapered files 31, 32, 33 and 34 in accordance with the present invention.
  • Each of the files is shown with a first portion A adjacent the tip 40 and a second portion B remote from the tip, extending back to the shank, not shown.
  • the portions A and B have different tapers in the same file and the taper in the first portion also varies from file to file.
  • file 31 the taper of the first portion is 0.12.
  • file 32 the taper of the first portion is 0.10.
  • file 33 the taper of the first portion is 0.08.
  • file 34 the taper of the first portion is 0.06.
  • the taper of the first portion may be 0.04 or 0.02, as appropriate.
  • the same variation of taper of the first portion from file to file of a given set applies to all of the file sets disclosed herein.
  • the taper of the second portion B is 0.02 mm/mm.
  • the taper of the second portion B is 0.04 mm/mm.
  • the files of FIGS. 3A-3D are the Group I files discussed hereinabove.
  • FIGS.4A-4D schematically represent different sets of files from those of FIGS. 3A-3D. These are the Group II files discussed above.
  • FIGS. 4A-4D show files 41, 42, 43 and 44 in a multi-tapered configuration.
  • each of the files 41-44 there is a first portion A adjacent the tip 50 and a second portion B remote from the tip, extending to the shank.
  • each of the first portions is a different length from those of the other first portions, being shortest for the file 41 which has the greatest taper of the first portion A (0.12) and increasing successively for files 42, 43 and 44 as the taper of the first portion diminishes.
  • one set of files 41-44 has a taper of 0.02 mm/mm for the second portion B whereas another set has a taper of 0.04 mm/mm for the second portion B.
  • the respective lengths of the first and second portions of the files of the files of the present invention are determined on the basis of a number of factors, such as the material of the files (whether nickel titanium, stainless steel or some other material) , the specific tapers of the first and second portions, file diameters, and the like. Selection of the length L of the first portion fixes the length of the second portion as 16-L A (for a file having a flute length of 16 mm. ) .
  • FIGS. 5A-5D schematically represent another set of four multi-tapered files 51, 52, 53 and 54 in accordance with the present invention.
  • Each of the files is shown with a first portion A adjacent the tip 60 and a second portion B remote from the tip, extending back to the shank, not shown.
  • the portions A and B have different tapers in the same file and the taper in the first portion also varies from file to file.
  • file 51 the taper of the first portion is 0.12.
  • file 52 the taper of the first portion is 0.10.
  • file 53 the taper of the first portion is 0.08.
  • file 54 the taper of the first portion is 0.06.
  • the taper of the second portion varies from file to file, increasing in taper as the taper of the first portion reduces.
  • the taper of the second portion is 0.01 mm/mm; for the file 52, it is 0.02; for the file 53 it is 0.03; and for the file 54 the taper of the second portion is 0.04 mm/ram.
  • the files of FIGS. 5A-5D are the Group III files discussed hereinabove.
  • FIGS. 6A-6D schematically represent still another set of files in accordance with the invention, the Group IV files discussed above.
  • FIGS. 6A-6D show files 61, 62, 63 and 64 in a multi-tapered configuration.
  • each of the files 61-64 there is a first portion A adjacent the tip 70 and a second portion B remote from the tip, extending to the shank.
  • each of the first portions is a different length from those of the other first portions, being shortest for the file 61 which has the greatest taper of the first portion A (0.12) and increasing successively for files 62, 63 and 64 as the taper of the first portion diminishes, beginning at 0.10 for file 61 and extending to 0.06 for file 64.
  • Smaller tapers of 0.04 and 0.02 may be provided in fifth and sixth files, as appropriate, if desired.
  • the ratio of taper of the first portion to taper of the second portion ranges between 3 and 6 for the set of Group I files with a second portion taper of 0.02. Where the smallest taper of the first portion is 0.02, the range of taper ratios is from 1 to 6.
  • the taper of the second portion varies from file to file, increasing in taper as the taper of the first portion reduces.
  • the taper of the second portion is 0.01 mm/mm; for the file 62, it is 0.02; for the file 63 it is 0.03; and for the file 64 the taper of the second portion is 0.04 mm/mm.
  • multi-tapered files in accordance with the invention for the preparation of root canals in teeth, a better result can be obtained in less time and with resort to a lesser number of files.
  • one of the multi-tapered files is driven deeper into the root of a tooth, different portions of the cutting flute at different depths of the file become effective to shape the root canal to a finished configuration in preparation for receiving the gutta percha or other filling materials.
  • the files may be of different shapes and cross- sectional configurations, corresponding but not limited to the shapes represented schematically in FIGS. 7A, 7B, 7C and 7D.
  • FIG. 7A shows an instrument 120 in cross section with three cutting edges 122, 124 and 126. Between the cutting edges 122, 124 and 126 are three faces 123, 125 and 127, respectively. These faces are generally shaped in cross section to provide a positive rake angle or improved cutting edges at 122, 124 and 126.
  • FIG. 7B shows an instrument 130 in cross section with three cutting edges 132, 134 and 136. Between the cutting edges are three faces 133, 135 and 137. Each of the faces is concave in cross section with a radial land as the flute edge.
  • the configuration of FIG. 7B provides improved cutting edges 132, 134 or 136, with reduced manufacturing costs compared to FIG. 7A.
  • FIG. 7C shows, in cross section, an instrument 140.
  • T/his instrument has a triangular cross section with planar faces 143, 145 and 147 between cutting edges 142, 144 and 146.
  • FIG. 7D shows, in cross section, an instrument 150.
  • This instrument unlike the others, has two opposed cutting surfaces 152, 154.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Neurosurgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

Cette invention concerne une série de limes à angles de dépouille multiples pour applications d'endodontie. Ces limes comprennent au moins deux parties : une première partie adjacente à la pointe et une deuxième partie adjacente à la tige. Les deux parties présentent des angles de dépouille différents. Les limes sont fournies par jeux d'au moins quatre limes avec, sur toutes les limes, l'angle de dépouille de la première partie allant en diminuant progressivement de la première à la dernière lime du jeu. Dans certains jeux, les angles de dépouille des secondes parties sont les mêmes et correspondent à l'un de deux angles prédéterminés. Sur d'autres jeux, les angles de dépouille des seconde parties vont en augmentant de lime en lime au fur et à mesure que les angles de dépouille des premières parties diminuent.
EP02707719A 2001-02-05 2002-02-05 Limes dentaires a angles de depouille multiples Withdrawn EP1357851A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US26606601P 2001-02-05 2001-02-05
US266066P 2001-02-05
PCT/US2002/003516 WO2002062251A2 (fr) 2001-02-05 2002-02-05 Limes dentaires a angles de depouille multiples

Publications (2)

Publication Number Publication Date
EP1357851A2 true EP1357851A2 (fr) 2003-11-05
EP1357851A4 EP1357851A4 (fr) 2005-09-28

Family

ID=23013016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02707719A Withdrawn EP1357851A4 (fr) 2001-02-05 2002-02-05 Limes dentaires a angles de depouille multiples

Country Status (9)

Country Link
EP (1) EP1357851A4 (fr)
JP (1) JP2004522524A (fr)
KR (1) KR20030084918A (fr)
CN (1) CN1527685A (fr)
BR (1) BR0206749A (fr)
CA (1) CA2436300A1 (fr)
IL (1) IL157042A0 (fr)
MX (1) MXPA03006928A (fr)
WO (1) WO2002062251A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2482320C (fr) * 2002-04-19 2010-02-09 Georg T. Wondrak Procedes de modulation de la phototoxicite
US20050186534A1 (en) * 2004-02-25 2005-08-25 Roane James B. Endodontic instrument set and method of using the same
US7967605B2 (en) * 2004-03-16 2011-06-28 Guidance Endodontics, Llc Endodontic files and obturator devices and methods of manufacturing same
ES2706048T3 (es) * 2007-08-01 2019-03-27 Mani Inc Fresa de acero inoxidable
CH707745B1 (fr) * 2013-03-12 2017-05-31 Fkg Dentaire S A Instrument endodontique, notamment pour l'alésage d'un canal radiculaire.
JP7218094B2 (ja) * 2018-04-10 2023-02-06 マニー株式会社 歯科用ファイル
WO2020045491A1 (fr) 2018-08-29 2020-03-05 マニー株式会社 Lime dentaire
CN110525101B (zh) * 2019-09-13 2021-03-23 台州市皓仔邦工业设计有限公司 模具雕刻三角凿子

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4850867A (en) * 1988-02-05 1989-07-25 Board Of Regents, The University Of Texas System Endodontic instrument
DE19723695A1 (de) * 1997-06-05 1998-12-10 Hoppe Wolfgang Dr Med Dent Uni Wurzelkanalinstrument
US5855479A (en) * 1994-02-14 1999-01-05 Wong; Nelson J. Step-back eliminating tapered dental cutting instruments for improved root canal treatment and method
US6106296A (en) * 1995-01-17 2000-08-22 Tulsa Dental Products Inc. Method of endodontic preparation of a root canal and a file set for use in the method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4611508A (en) * 1983-02-08 1986-09-16 Roane James B Endodontic instrument

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4850867A (en) * 1988-02-05 1989-07-25 Board Of Regents, The University Of Texas System Endodontic instrument
US5855479A (en) * 1994-02-14 1999-01-05 Wong; Nelson J. Step-back eliminating tapered dental cutting instruments for improved root canal treatment and method
US6106296A (en) * 1995-01-17 2000-08-22 Tulsa Dental Products Inc. Method of endodontic preparation of a root canal and a file set for use in the method
DE19723695A1 (de) * 1997-06-05 1998-12-10 Hoppe Wolfgang Dr Med Dent Uni Wurzelkanalinstrument

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO02062251A2 *

Also Published As

Publication number Publication date
JP2004522524A (ja) 2004-07-29
BR0206749A (pt) 2004-02-10
WO2002062251A9 (fr) 2003-01-30
CA2436300A1 (fr) 2002-08-15
EP1357851A4 (fr) 2005-09-28
CN1527685A (zh) 2004-09-08
IL157042A0 (en) 2004-02-08
KR20030084918A (ko) 2003-11-01
WO2002062251A3 (fr) 2002-10-10
WO2002062251A2 (fr) 2002-08-15
MXPA03006928A (es) 2004-10-15

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