(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT
`COOPERATION TREATY (PCT)
`
`(19) World Intellectual Property
`Organization
`International Bureau
`
`(43) International Publication Date
`March 22, 2001 (03.22.2001)
`
`(10) International Publication Number
`WO 01/19279 A1
`
`(51) International Patent Classification7: A61C 5/02
`
`(21) International Patent Number:
`
`International Filing Date:
`(22)
`(07.28.2000)
`
`(25) Filing Language:
`
`(26) Publication Language:
`
`PCT/FR00/02162
`
`July 28, 2000
`
`French
`
`French
`
`(30) Priority Data:
`99/11448
`September 10, 1999 (09.10.1999)
`
`FR
`
`(71) Applicant (for all Designated States except USA):
`MICRO-MEGA (SOCIETE ANONYME [LIMITED
`COMPANY]) [FR/FR]; 12 rue du Tunnel, F-25000
`Besançon (FR).
`
`(81) Designated States (national): AE, AG, AL, AM,
`AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN,
`CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD,
`GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP,
`KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG,
`MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU,
`SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG,
`US, UZ, VN, YU, ZA, ZW.
`
`(84) Designated States (regional): ARIPO patent (GH,
`GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW),
`Eurasian patent (AM, AZ, BY, KG, KZ, MD, RU, TJ,
`TM), European patent (AT, BE, CH, CY, DE, DK, ES,
`FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE), OAPI
`patent (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML,
`MR, NE, SN, TD, TG).
`
`Published:
`- With international search report.
`
`(72) Inventor; and
`(75) Inventor/Applicant (for US only): BADOZ, Jean-
`Marie [FR/FR]; Rue de la Chaussée, F-25300 Doubs
`(FR).
`
`the two-letter codes and other
`For the meanings of
`abbreviations, please refer to “Guidance Notes on
`Codes and Abbreviations” shown at the beginning of
`each regular issue of the PCT Gazette.
`
`(74) Agent: POUPON, Michel; Cabinet Michel
`Poupon, 3, rue Ferdinand Brunot, F-88026 Epinal Cedex
`(FR).
`
`(54) Title:
`MAKING SAME
`
`ROOT CANAL INSTRUMENT SUCH AS A ROOT-CANAL REAMER AND METHOD FOR
`
`(57) Abstract: The invention concerns a root-canal instrument (1) such as a
`root-canal reamer, comprising a working section (10) including three flutes (20,
`21, 22) forming three cutting lips (30, 31, 32). The invention is characterized in
`that the three cutting lips (30, 31, 32) are located at the apices of an isosceles
`triangle. The invention further concerns various methods for making the
`inventive root-canal instrument (1).
`
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`1
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`PCT/FR00/02162
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`Root-canal instrument such as a root-canal reamer and method for making same
`The present invention concerns the field of production of endodontic instruments for the
`preparation of root canals, and more specifically root-canal instruments of the root-canal reamer
`type, comprising a working section called a “blade”, including three flutes forming three cutting
`lips.
`
`The prior art already includes root-canal instruments comprising a working section
`including three flutes forming three cutting lips.
`In particular, the prior art includes this type of instrument in French patent applications
`no. 96 04987 and 96 14347.
`The instruments described in the aforementioned patent applications have a circular
`symmetry in the order of three or more, depending on the number of cutting lips on the
`instrument.
`As such, when the instrument is used in rotation in a curved root canal, the instrument
`follows the axis of the canal due to the balance of the forces applied to the instrument.
`This type of instrument is satisfactory except when the canal cannot be treated as a hole
`of circular cross-section. In this latter case, the forces applied during the preparation of the canal
`are no longer balanced and the trajectory of the instrument may deviate with respect to the axis
`of the root canal. This deviation may have very serious consequences, since it can lead to the
`creation of a directional mishap or even a perforation of the canal.
`The present invention is intended to remedy the drawbacks of the prior art by proposing
`an instrument whose blade alleviates this risk. This goal is attained by intentionally breaking the
`circular symmetry of the instrument, so that the tip of the instrument is able to search for the root
`canal and penetrate it naturally, since the bending resistance of the blade is no longer the same in
`all directions.
`in accordance with the invention, comprises a
`instrument,
`the root-canal
`As such,
`working section including three flutes forming three cutting lips, and it is characterized in that
`the three cutting lips are located at the apices of a triangle, which is not equilateral, but rather
`isosceles.
`The present invention also refers to different methods to make the root-canal instrument
`in accordance with the invention.
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`PCT/FR00/02162
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`The invention can be better understood using the description made hereinafter of an
`implementation mode given by way of example but without limitation, in reference to the
`appended figures, in which:
`- Figure 1 shows a cross-section view of a root-canal instrument of the prior art, whose three
`cutting lips are located at the apices of an equilateral triangle;
`- Figure 2 shows a cross-section view of a root-canal instrument in accordance with the present
`invention, obtained by means of a first method for making the same;
`- Figure 3 shows a cross-section view of a root-canal instrument in accordance with the present
`invention, obtained by means of a second method for making the same; and
`- Figure 4 shows a cross-section view of a root-canal instrument in accordance with the present
`invention, obtained by means of a third method for making the same.
`
`In accordance with the present invention, the root-canal instrument (1) is of the root-canal
`reamer type, comprising a working section (10) including three flutes (20, 21, 22) forming three
`cutting lips (30, 31, 32). It is characterized by the fact that the three cutting lips (30, 31, 32) are
`located at the apices of an isosceles triangle.
`
`As with all root-canal instruments of this type, the instrument according to this invention
`possesses a working section (10), also known as a “blade”, whose active part is obtained by
`grinding and has a conical shape also obtained by grinding. The conical shape is obtained most
`frequently by gradually moving the grinding wheel away from the axis of the instrument as one
`moves away from the tip of the instrument.
`A root-canal instrument (0) of the prior art, obtained by milling three identical flutes (20,
`21, 22), forming three cutting lips (30, 31, 32), arranged at 120˚ angles from each other, is shown
`in Figure 1.
`
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`invention also refers to different methods for making the root-canal
`The present
`instrument in accordance with the invention.
`
`25
`
`The first possibility for making the instrument (1) in accordance with the invention
`consists in making two flutes (20, 21) by conducting two successive, identical milling operations,
`at 120˚, and then making the third flute (22) by
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`conducting a third milling at a greater depth than the first two, as shown in Figure 2.
`It is also possible to make the depth of the third flute (22) such that it is greater than that
`of the first two flutes (20, 21) at the tip of the working section (10) of the instrument, then
`becomes identical to the depth of the first two flutes (20, 21).
`The depth of the third flute (22) may become identical to that of the first two flutes (20,
`21) either at the end of the working section (10), or before the end of the working section (10).
`
`A second possibility for making the instrument (1) in accordance with the invention
`consists in making two flutes (20, 21) by conducting two successive, identical milling operations,
`at an angle greater than 120˚, and then making the third flute (22) by conducting a third milling
`operation as a complement to the first two, as shown in Figure 3.
`
`A third possibility for making the instrument (1) in accordance with the invention
`consists in making two flutes (20, 21) by conducting two successive, identical milling operations,
`at an angle less than 120˚, and then making the third flute (22) by conducting a third milling
`operation as a complement to the first two, as shown in Figure 4.
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`4
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`CLAIMS
`
`PCT/FR00/02162
`
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`Root-canal instrument (1) of the root-canal reamer type, comprising a working section
`1 -
`(10) including three flutes (20, 21, 22) forming three cutting lips (30, 31, 32), characterized in
`that the three cutting lips (30, 31, 32) are located at the apices of an isosceles triangle.
`2 -
`Method for making a root-canal instrument (1) in accordance with claim 1, characterized
`by the fact that two flutes (20, 21) are made by conducting two successive, identical milling
`operations, at 120˚ with respect to each other, and then the third flute (22) is made by conducting
`a third milling operation at a greater depth than the first two.
`3 -
`Method for making a root-canal instrument (1) in accordance with claim 2, characterized
`by the fact that the third flute (22) is deeper than the two flutes (20, 21) at the tip of the working
`section (10) of the instrument, then becomes identical to the depth of the first two flutes (20, 21).
`4 -
`Method for making a root-canal instrument (1) in accordance with claim 1, characterized
`by the fact that two flutes (20, 21) are made by conducting two successive, identical milling
`operations, at an angle greater than 120˚ with respect to each other, and then the third flute (22)
`is made by conducting a third milling operation as a complement to the first two.
`5 -
`Method for making a root-canal instrument (1) in accordance with claim 1, characterized
`by the fact that two flutes (20, 21) are made by conducting two successive, identical milling
`operations, at an angle less than 120˚ with respect to each other, and then the third flute (22) is
`made by conducting a third milling operation as a complement to the first two.
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`TRANSPERFECT
`
`City of New York, State of New York, County of New York
`
`], Aurora Landman, hereby certify that the document, “ROOT CANAL
`
`INSTRUMENT SUCH AS A ROOT-CANAL REAMER AND METHOD FOR
`
`MAKING SAME?”is, to the best of my knowledge and belief, a true and accurate
`
`translation from French into English.
`
`Aurora Landman
`
`Swom to before me this
`April 4, 2018
`
`Signature, Notary Public
`
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`Stamp, Notary Public
`
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