WO2016166647A1 - Cutting instrument, in particular a dental cutting instrument - Google Patents

Cutting instrument, in particular a dental cutting instrument Download PDF

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Publication number
WO2016166647A1
WO2016166647A1 PCT/IB2016/052039 IB2016052039W WO2016166647A1 WO 2016166647 A1 WO2016166647 A1 WO 2016166647A1 IB 2016052039 W IB2016052039 W IB 2016052039W WO 2016166647 A1 WO2016166647 A1 WO 2016166647A1
Authority
WO
WIPO (PCT)
Prior art keywords
handle
instrument
active part
cutting instrument
active
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.)
Ceased
Application number
PCT/IB2016/052039
Other languages
French (fr)
Inventor
Alain Delval
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.)
Dentsply Maillefer Instruments Holding SARL
Original Assignee
Maillefer Instruments Holding SARL
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 Maillefer Instruments Holding SARL filed Critical Maillefer Instruments Holding SARL
Priority to BR112017020798-2A priority Critical patent/BR112017020798B1/en
Priority to CN201680021838.6A priority patent/CN107708601B/en
Priority to CA2979631A priority patent/CA2979631C/en
Priority to JP2017554385A priority patent/JP6758319B2/en
Publication of WO2016166647A1 publication Critical patent/WO2016166647A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • A61C3/00—Dental tools or instruments
    • A61C3/02—Tooth drilling or cutting instruments; Instruments acting like a sandblast machine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/16—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans
    • A61B17/1613—Component parts
    • A61B17/1615—Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/16—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans
    • A61B17/1613—Component parts
    • A61B17/1622—Drill handpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/03—Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/28—Details of hard metal, i.e. cemented carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/64—Nickel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/84—Steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/88—Titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/08—Brazed connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/16—Welded connections

Definitions

  • the present invention relates to the field of cutting instruments and in particular instruments intended for the medical field such as dental or surgical instruments. More particularly, the invention is targeted towards a rotary cutting instrument such as a bur.
  • a bur can be used, for example, in the medical field for bone surgery or in the dental field for implantology or in endodontic treatments for drilling root canals, shaping stumps, preparing and trimming crowns, preparing cavities, removing dentine, enamel or restorative materials from the tooth such as amalgams, composites, ceramics or metals.
  • burs at least the active cutting part of which is made of a metal carbide, in particular tungsten carbide.
  • a metal carbide in particular tungsten carbide.
  • This material is used in particular because of its cutting performance and its durability.
  • the carbide does not corrode and is sufficiently hard for it to be used at high speeds, even for cutting bone.
  • Cutting instruments in which the active part is made of carbide include instruments in which the handle is made of stainless steel or instruments in which the whole instrument formed by the active part and the handle is made from a single piece made of a carbide.
  • the aim of the present invention is to provide a cutting instrument, in particular a cutting instrument for dental or surgical use of the bur type, the active part of which is made of carbide, in particular tungsten carbide, and the cutting performance of which is increased.
  • the object of the present invention is a rotary cutting instrument, in particular of the bur type, comprising an active cutting part and a handle, said active part being made of a metal carbide, characterised in that the handle is made of a nickel -titanium alloy; and in that the instrument further comprises an intermediate part made of stainless steel placed between the active part and the handle and metallurgically connected to said active part and to said handle.
  • Figure 1 illustrates an embodiment of the invention having the form of a bur for dental use.
  • the cutting instrument is a dental instrument and in particular a bur 1 used in implantology or during endodontic treatments for drilling root canals, shaping stumps, preparing and trimming crowns, preparing cavities, removing dentine, enamel or restorative materials from the tooth such as amalgams, composites, ceramics or metals.
  • the cutting instrument in accordance with the invention can also be a surgical instrument intended, for example, for bone surgery.
  • the bur 1 comprises an active part 2 and a handle 3 intended to be inserted in a motor, in a hand piece or a contra-angle in order for it to be rotationally driven.
  • the shape of the active part 2, its cutting edges, its length, its geometry, etc. will not be described in more detail herein.
  • the active part 2 is made of a metal carbide and preferably tungsten carbide (WC) whilst the handle 3 is made of a nickel-titanium alloy (NiTi).
  • WC tungsten carbide
  • NiTi nickel-titanium alloy
  • Nickel- titanium alloys are frequently used in the medical and dental fields, in particular owing to their flexibility. Therefore, the alloy composition forming the handle 3 will not be described in more detail herein.
  • an intermediate part 4 is inserted between the active part 2 and the handle 3 of the cutting instrument 1.
  • This intermediate part 4 is made of stainless steel and is suitably metallurgically connected to the handle 3 made of nickel-titanium and to the active part 2 made of a carbide.
  • the intermediate part 4 is brazed to the active part 2 made of a carbide whilst it is welded to the handle 3 made of nickel-titanium.
  • the intermediate part 4, the active part 2 and the handle 3 are metallurgically connected to each other by any suitable means known to the person skilled in the art.
  • the aim of the intermediate part 4 is to allow the connection between the active part 2 made of tungsten carbide and the handle 3 made of nickel-titanium. In fact, it is very difficult to form a metallurgical connection directly between the tungsten carbide and the nickel- titanium.
  • the intermediate part 4 made of stainless steel has a length or thickness between 0.05 and 50 mm, more preferably 1.5 mm. The person skilled in the art is able to determine the suitable length/thickness of the intermediate part 4 allowing an effective connection between the active part 2 made of a carbide and the handle 3 made of nickel-titanium.
  • the instalment in accordance with the present invention has improved cutting performance, in particular compared with instruments in which the handle is made of steel or a carbide: in fact, the handle 3 made of nickel -titanium is more flexible than a handle made of steel or a carbide.
  • This flexibility allows in particular the production of cutting instruments intended for surgery, in which the handle is sufficiently flexible to allow work in a curved canal.
  • the flexibility of the handle generates vibrations along the instrument upon use thereof (rotation), said vibrations increasing the cutting performance of the instrument.
  • a cutting instrument intended in particular for use in the dental or surgical field, which performs well and combines the advantages of an active part made of a carbide and a handle made of nickel-titanium, is thus obtained.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Epidemiology (AREA)
  • Mechanical Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

The present invention relates to a rotary cutting instrument (1), in particular of the bur type, intended for chirurgical or dental use and comprising an active cutting part (2) and a handle (3). Said active part (2) is made of a metal carbide and the handle (3) is made of a nickel- titanium alloy. The instrument further comprises an intermediate part (4) made of stainless steel placed between the active part (2) and the handle (3) and metallurgically connected to said active part (2) and to said handle (3).

Description

CUTTING INSTRUMENT, IN PARTICULAR A DENTAL CUTTING INSTRUMENT
The present invention relates to the field of cutting instruments and in particular instruments intended for the medical field such as dental or surgical instruments. More particularly, the invention is targeted towards a rotary cutting instrument such as a bur.
A bur can be used, for example, in the medical field for bone surgery or in the dental field for implantology or in endodontic treatments for drilling root canals, shaping stumps, preparing and trimming crowns, preparing cavities, removing dentine, enamel or restorative materials from the tooth such as amalgams, composites, ceramics or metals.
In the field of dentistry and bone surgery, it is known to use burs, at least the active cutting part of which is made of a metal carbide, in particular tungsten carbide. This material is used in particular because of its cutting performance and its durability. In fact, in contrast to carbon steel, the carbide does not corrode and is sufficiently hard for it to be used at high speeds, even for cutting bone. Cutting instruments in which the active part is made of carbide include instruments in which the handle is made of stainless steel or instruments in which the whole instrument formed by the active part and the handle is made from a single piece made of a carbide.
The aim of the present invention is to provide a cutting instrument, in particular a cutting instrument for dental or surgical use of the bur type, the active part of which is made of carbide, in particular tungsten carbide, and the cutting performance of which is increased. The object of the present invention is a rotary cutting instrument, in particular of the bur type, comprising an active cutting part and a handle, said active part being made of a metal carbide, characterised in that the handle is made of a nickel -titanium alloy; and in that the instrument further comprises an intermediate part made of stainless steel placed between the active part and the handle and metallurgically connected to said active part and to said handle.
Figure 1 illustrates an embodiment of the invention having the form of a bur for dental use.
In accordance with a preferred embodiment of the invention, the cutting instrument is a dental instrument and in particular a bur 1 used in implantology or during endodontic treatments for drilling root canals, shaping stumps, preparing and trimming crowns, preparing cavities, removing dentine, enamel or restorative materials from the tooth such as amalgams, composites, ceramics or metals. As an alternative, the cutting instrument in accordance with the invention can also be a surgical instrument intended, for example, for bone surgery.
The bur 1 comprises an active part 2 and a handle 3 intended to be inserted in a motor, in a hand piece or a contra-angle in order for it to be rotationally driven. The shape of the active part 2, its cutting edges, its length, its geometry, etc. will not be described in more detail herein.
In accordance with the invention, the active part 2 is made of a metal carbide and preferably tungsten carbide (WC) whilst the handle 3 is made of a nickel-titanium alloy (NiTi). Nickel- titanium alloys are frequently used in the medical and dental fields, in particular owing to their flexibility. Therefore, the alloy composition forming the handle 3 will not be described in more detail herein.
In accordance with the invention, an intermediate part 4 is inserted between the active part 2 and the handle 3 of the cutting instrument 1. This intermediate part 4 is made of stainless steel and is suitably metallurgically connected to the handle 3 made of nickel-titanium and to the active part 2 made of a carbide. Preferably, the intermediate part 4 is brazed to the active part 2 made of a carbide whilst it is welded to the handle 3 made of nickel-titanium.
Generally, the intermediate part 4, the active part 2 and the handle 3 are metallurgically connected to each other by any suitable means known to the person skilled in the art. The aim of the intermediate part 4 is to allow the connection between the active part 2 made of tungsten carbide and the handle 3 made of nickel-titanium. In fact, it is very difficult to form a metallurgical connection directly between the tungsten carbide and the nickel- titanium. Preferably, the intermediate part 4 made of stainless steel has a length or thickness between 0.05 and 50 mm, more preferably 1.5 mm. The person skilled in the art is able to determine the suitable length/thickness of the intermediate part 4 allowing an effective connection between the active part 2 made of a carbide and the handle 3 made of nickel-titanium. The instalment in accordance with the present invention has improved cutting performance, in particular compared with instruments in which the handle is made of steel or a carbide: in fact, the handle 3 made of nickel -titanium is more flexible than a handle made of steel or a carbide. This flexibility allows in particular the production of cutting instruments intended for surgery, in which the handle is sufficiently flexible to allow work in a curved canal. In addition, the flexibility of the handle generates vibrations along the instrument upon use thereof (rotation), said vibrations increasing the cutting performance of the instrument.
A cutting instrument, intended in particular for use in the dental or surgical field, which performs well and combines the advantages of an active part made of a carbide and a handle made of nickel-titanium, is thus obtained.

Claims

Claims
Rotary cutting instrument (1), in particular of the bur type, comprising an active cutting part (2) and a handle (3), said active part (2) being made of a metal carbide, characterised in that the handle (3) is made of a nickel -titanium alloy; and in that the instrument further comprises an intermediate part (4) made of stainless steel placed between the active part (2) and the handle (3) and metallurgically connected to said active part (2) and to said handle (3).
Instrument as claimed in claim 1, characterised in that the active part (2) is made of tungsten carbide.
Instrument as claimed in the preceding claim, characterised in that the intermediate part (4) is welded to the handle (3) and brazed to the active part (2).
Instrument as claimed in any one of the preceding claims, characterised in that the intermediate part (4) has a length between 0.05 and 50 mm.
Instrument as claimed in the preceding claim, characterised in that the intermediate part (4) has a length of 1.5 mm.
PCT/IB2016/052039 2015-04-16 2016-04-11 Cutting instrument, in particular a dental cutting instrument Ceased WO2016166647A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR112017020798-2A BR112017020798B1 (en) 2015-04-16 2016-04-11 rotary cutting instrument, in particular of the drill type for surgical or dental use
CN201680021838.6A CN107708601B (en) 2015-04-16 2016-04-11 Cutting instrument, in particular dental cutting instrument
CA2979631A CA2979631C (en) 2015-04-16 2016-04-11 Cutting instrument, in particular a dental cutting instrument
JP2017554385A JP6758319B2 (en) 2015-04-16 2016-04-11 Cutting tools, especially dental cutting tools

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15163782.4 2015-04-16
EP15163782.4A EP3081186B1 (en) 2015-04-16 2015-04-16 Cutting instrument, in particular a dental cutting instrument

Publications (1)

Publication Number Publication Date
WO2016166647A1 true WO2016166647A1 (en) 2016-10-20

Family

ID=52875602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/052039 Ceased WO2016166647A1 (en) 2015-04-16 2016-04-11 Cutting instrument, in particular a dental cutting instrument

Country Status (7)

Country Link
US (1) US9931178B2 (en)
EP (1) EP3081186B1 (en)
JP (1) JP6758319B2 (en)
CN (1) CN107708601B (en)
BR (1) BR112017020798B1 (en)
CA (1) CA2979631C (en)
WO (1) WO2016166647A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118370614A (en) * 2023-01-29 2024-07-23 山西医科大学第一医院 A root cutting gap increaser

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882198A (en) * 1997-03-28 1999-03-16 Ormco Corporation Endodontic instrument having enhanced compliance at the tip
US20110195377A1 (en) * 2010-02-11 2011-08-11 Sybron Canada Lp Bur and Method of Making Same

Family Cites Families (11)

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EP1237668A1 (en) * 1999-08-30 2002-09-11 Abelity, LLC Barbed endodontic instrument
JP3594867B2 (en) * 2000-01-21 2004-12-02 吉継 寺内 Dental instrument for removing broken pieces
JP4186713B2 (en) * 2003-05-29 2008-11-26 マニー株式会社 Root canal treatment instrument and manufacturing method
CN1853837A (en) * 2005-04-27 2006-11-01 周钟霖 Cutting tool for milling printing circuit board
US20090170053A1 (en) * 2006-05-23 2009-07-02 Nihon University Cutting Bar for Dental Use
US20080318184A1 (en) * 2007-06-13 2008-12-25 Brian Zargari Vibratory Dental Tool
SE533679C2 (en) * 2009-04-07 2010-11-30 Sandvik Intellectual Property Solid step drill
JP5066212B2 (en) * 2010-03-25 2012-11-07 ユニオンツール株式会社 Drilling tool
JP5980115B2 (en) * 2010-06-30 2016-08-31 マニー株式会社 Medical cutting instrument
US20120214125A1 (en) * 2011-02-18 2012-08-23 Ss White Burs, Inc. Endodontic burs, kits, and methods for using endodontic burs
TWM467521U (en) * 2013-07-15 2013-12-11 Tct Global Ltd Drill structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5882198A (en) * 1997-03-28 1999-03-16 Ormco Corporation Endodontic instrument having enhanced compliance at the tip
US20110195377A1 (en) * 2010-02-11 2011-08-11 Sybron Canada Lp Bur and Method of Making Same

Also Published As

Publication number Publication date
CN107708601B (en) 2020-09-08
CA2979631A1 (en) 2016-10-20
BR112017020798A2 (en) 2018-06-26
EP3081186B1 (en) 2018-05-23
JP6758319B2 (en) 2020-09-23
BR112017020798B1 (en) 2021-02-02
CA2979631C (en) 2023-05-23
JP2018514276A (en) 2018-06-07
EP3081186A1 (en) 2016-10-19
CN107708601A (en) 2018-02-16
US20160302882A1 (en) 2016-10-20
US9931178B2 (en) 2018-04-03

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