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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; 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

Definitions

• the present invention relates to an endodontic instrument for boring a tooth of a patient, in particular a root canal boring instrument, said instrument having a longitudinal axis and having a working zone corresponding to a first end, said end. free of the instrument, this working area being arranged to form and / or shape and / or cut the inner wall of said root canal, said working area being connected to a holding tip arranged to be fixed on a support which corresponds to a second end of the instrument.
• the cleaning and shaping of the root canals of a tooth in order to receive filling substances is carried out by the use of boring instruments having an active part, said working part, which purpose of shaping, cutting and cleaning the inner walls of the root canal to prepare it for receiving treatment materials and a
• Most dental canal boring instruments include an active portion, referred to as a sectional section, having a conical envelope and one or more cutting edges helically wound along said active portion.
• This helical size of the instrument is essential to allow the evacuation of dentine debris to the outside of the root canal.
• the tapered portion of the instrument which is the work area, may experience a sheathing phenomenon of winding material torn from the channel along the helix and forming a sheath. which renders the instrument totally ineffective.
• this instrument when this instrument is introduced in the canal and rotated by a handpiece equipped with an electric motor, it may happen that it is screwed into the channel, which has the effect of blocking it, this blocking up to its break.
• Japanese Publication JP 59 019120 discloses an instrument that has a work area that includes adjacent straight segments that alternate with twisted sectors. However, these segments have uniform sections along their length, and the flutes do not fit within a conical envelope. In addition, the cross-sections of the instrument in the work area do not have variations that are both beneficial to the function "material cut of the channel wall” and to the function "evacuation of the cut material along of this wall ".
• Another quality that a good endodontic instrument must have is the efficiency of the cut. This property makes it possible to work in the dentine without causing too much heating, not to smooth the canal walls and thus to block the tubulis of the dental root with infected debris. Good cutting efficiency also allows the instrument to work with less torsional stress, which reduces the risk of breakage of the instrument in use. In addition, good cutting efficiency allows the operator to work with a lower working torque, resulting in increased patient safety in case of torsional breakage. Finally good cutting efficiency allows a faster root treatment that avoids excessive cyclic fatigue in the curvatures of the root canals that the instrument must follow during operation.
• the present invention proposes to make such an instrument that meets these two somewhat antinomic requirements while maintaining an effective cutting function and anti-screwing function in order to provide professionals with safe tools that enable them to perform the following tasks. required tasks and to ensure patient safety,
• the endodontic instrument for the boring of root canals according to the invention, as defined in the preamble and characterized in that said flutes are integrally located on and within a conical envelope whose section tapers progressively from said second end to said first end of the instrument, and in that said work area is subdivided into adjacent segments in which flutes alternately have a straight sector and a helically twisted sector and are arranged in such a way that their edges are located either on said conical envelope or inside said conical envelope at the level of the straight sectors and at the level of twisted sectors.
• the edge of each corresponding flute of the right sector is located on the conical envelope and the edge of each corresponding flute of the twisted sector is located inside said envelope. conical.
• the edge of each corresponding flute of the straight sector is located inside the conical envelope and the edge of each corresponding flute of the twisted sector is located on said conical envelope.
• said working area of the instrument comprises at least two flutes.
• the cross section of the working area at the right sector has a surface greater than the cross section of the working area at the adjacent twisted sector.
• the cross section of the working area at the right sector has a surface smaller than the cross section of the working area at the adjacent twisted sector.
• said cross-section of the work area at the right sector and at the twisted sector may have an equilateral triangle shape centered on said central axis or a center-shaped square shape. said central axis.
• the number of segments of the instrument is advantageously between one and five.
• the cross-section of the instrument in the portions where the ridges are located on said conical envelope and the portions where the ridges are located within said conical envelope has a surface difference of between 5 and 50%.
• FIGS. 1A, 1B, 1C and 1D show an instrument of the prior art as defined by Swiss Patent No. 692,484, FIGS. 2A, 2B, 2C and 2D represent an instrument of the art prior art as defined by French Patent No. 01 02452,
• FIG. 3A is a plan view illustrating the instrument according to the invention with its so-called working zone and its holding tip
• FIG. 3B is an enlarged partial view of the working zone of the instrument 30 of FIG. 3A
• FIGS. 3C and 3D are views in cross-section, respectively along the lines AA and BB illustrated in FIGS. 3A and 3B, in a first embodiment of the instrument
• FIGS. 3E and 3F are cross-sectional views, respectively along the lines A-A and B-B illustrated in FIGS. 3A and 3B, in an alternative embodiment of the instrument of FIG. 3A
• FIG. 4A is a plan view illustrating a second embodiment of the instrument according to the invention
• FIG. 4B is an enlarged partial view of the working area of the instrument of FIG. 4A
• FIG. 4A is a plan view illustrating a second embodiment of the instrument according to the invention
• FIG. 4B is an enlarged partial view of the working area of the instrument of FIG. 4A
• Figures 4C and 4D are cross-sectional views respectively along the lines A-A and B-B shown in Figures 4A and 4B.
• the root canal bore instrument 1 of a tooth of a patient which corresponds to the prior art defined by the patent.
• No. 692 484 comprises a working zone 2 arranged to form and / or shape and / or cut the inner wall of a root canal, this working zone being provided with a holding tip 3 arranged to be fixed on a support (not shown).
• the working zone consists of three flutes 2a, 2b and 2c which wind around a central axis and whose edges 4a, 4b and 4c are positioned on a conical envelope 5 whose section is reduced from the end near the holding tip 2 to the tip 6 of the instrument 1.
• the flutes 2a, 2b and 2c all have straight sections S which are, for example, delimited between the transverse section lines AA and BB in FIGS. 1A and 1B.
• Figures 1A and 1B respectively correspond to the cross sections of the instrument at the cutting lines AA and BB. It will be noted that the ridges 4a, 4b and 4c of the flutes 2a, 2b and 2c are always positioned on the conical envelope 5 of the working zone 2 of the instrument 1. It is this particularity that characterizes this instrument.
• the instrument 101 for boring root canals of a tooth of a patient comprises a working zone 102 arranged to form and / or shape and / or cut the inner wall of said root canal, this working zone being provided with a holding tip 103 arranged to be fixed on a support (not shown) .
• the working zone consists of three flutes 102a, 102b and 102c which wind around a central axis and whose edges 104a, 104b and
• 104c are positioned either on a conical casing 105 whose section is reduced from the near end of the retaining piece 103 towards the tip 106 of the instrument 101, or inside this casing.
• the flutes 102a, 102b and 102c all have continuously curved sections which are illustrated in the enlarged view of Figure 2B.
• Figures 2C and 2D respectively correspond to the cross sections of the instrument at the cutting lines A-A and B-B. It should be noted that the ridges 104a, 104b and 104c of the flutes 102a, 102b and 102c are positioned on the conical envelope 105 of the working area 102 of the instrument 101 at the cross section AA and the inside of this conical envelope 105 at the location of the cross section BB. It is this characteristic that characterizes this instrument.
• FIGS 3A, 3B. 3C, 3D, 3E and 3F illustrate an instrument 20 according to the invention 30 which comprises, like the instruments described below, a working zone 21 arranged to form and / or shape and / or cut the inner wall of said root canal, this working area being provided with a holding tip 23 arranged to be fixed on a support (not shown).
• This instrument can be used in rotary motion, driven by a mechanical handpiece or by an axial movement back and forth.
• the working zone 21 may consist of three flutes 22a, 22b and 22c or four flutes 22'a, 22'b, 22'c and 22'd that wind around a central axis and whose edges 24a , 24b and 24c or 24'a, 24'b, 24'c and 24'd are either positioned on a conical envelope 25 whose section is reduced from the end near the holding tip 23 towards the point 26 of the instrument 20, are positioned inside this envelope 25.
• FIG. 3B illustrates an enlarged view of a part of the working zone 21.
• the views 3C and 3E correspond to sectional views of two variants of the instrument 20 along the transverse line A-A. In one case, the instrument has three flutes and in the other it has four flutes.
• the views of FIGS. 3D and 3F correspond to sectional views of these two variants of the instrument 20 along the transverse line B-B.
• the working zone 21 is in fact subdivided into segments S in which the flutes alternately have a straight sector S1 and a helically twisted sector and S2 which are arranged in such a way that their edges are located either on said conical envelope or on the other side. inside said conical envelope at the level of the straight sectors S1 or at the level of the twisted sectors S2.
• each segment S of the three flutes 22a, 22b and 22c or the four flutes 22'a, 22'b, 22'c and 22'd comprises straight sectors S1 and twisted sectors. in helix S2 which
• Each segment has a straight sector and a twisted sector. Edges 24a, 24b and 24c of the flutes 22a, 22b and 22c at the section line BB of the straight sectors are positioned inside the conical envelope 25, as shown in FIG. 3D so that their cross-section It has a reduced area relative to that of the twisted sectors, which are called active sectors, the edges of which are positioned on the conical envelope 25, as shown in FIG. 3C.
• the latter shows the sectional view of the working zone 21 at the cutting line A-A.
• the straight sections of reduced section allow a good evacuation of the material torn from the walls of the canal
• FIGS. 3E and 3F An alternative embodiment of the instrument of the invention is illustrated by FIGS. 3E and 3F showing sectional views at the lines AA and B-B, respectively, of the working zone 21 having four flutes 22'a, 22'b, 22'c and 22'd.
• the findings are identical to those made for segments with three flutes.
• FIGS 4A, 4B. 4C and 4D illustrate an instrument 30 according to the invention which comprises, as the instruments described below, a working zone 31 arranged to form and / or shape and / or cut the inner wall of said root canal, this working zone being provided a holding tip 33 arranged to be fixed on a support (not shown).
• This instrument can be
• the working zone may consist of three flutes 32a, 32b and 32c that wind around an axis central and whose edges 34a, 34b and 34c are either positioned on a conical envelope 35, whose section is reduced from the end near the holding tip 32 to the tip 36 of the instrument 30, or positioned at the inside this envelope.
• Three flutes or
• the endodontic instrument is made in such a way that the number of segments (S) is between one and five.
• the cross-section of the instrument in the portions where the ridges (24a, 24b, 24c; 34a, 34b, 34c) are located on said conical shell (25; 35) and the portions where the ridges (24a, 24b, 24c, 34a, 34b, 34c) are located within said conical shell has a surface difference of between 5 and 50%. This reduction in area in the areas where the edges are internal to the envelope must be below a weakening threshold of the instrument, but nevertheless sufficient to promote the evacuation of material.
• the active cutting and machining sectors of the root canal comprise a straight segment S which is positioned on the conical envelope 35, whereas in the sectors of evacuation of the material cut by the active sectors. the edges are positioned inside said envelope 35.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=47172180

Family Applications (1)

Country Status (8)

Families Citing this family (2)

Family Cites Families (6)

• 2012
  • 2012-06-26 CH CH00898/12A patent/CH706647B1/fr unknown
• 2013
  • 2013-06-25 JP JP2015518750A patent/JP2015524681A/ja active Pending
  • 2013-06-25 CA CA2877389A patent/CA2877389C/fr active Active
  • 2013-06-25 EP EP13744417.0A patent/EP2863829A1/fr not_active Withdrawn
  • 2013-06-25 US US14/408,341 patent/US9724174B2/en active Active
  • 2013-06-25 CN CN201380040240.8A patent/CN104736101B/zh active Active
  • 2013-06-25 WO PCT/CH2013/000113 patent/WO2014000116A1/fr active Application Filing
• 2015
  • 2015-08-31 HK HK15108446.6A patent/HK1207814A1/xx unknown

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events