WO2022208148A1 - Instrument endodontique comprenant un outil en plastique et métal - Google Patents

Instrument endodontique comprenant un outil en plastique et métal Download PDF

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Publication number
WO2022208148A1
WO2022208148A1 PCT/IB2021/055900 IB2021055900W WO2022208148A1 WO 2022208148 A1 WO2022208148 A1 WO 2022208148A1 IB 2021055900 W IB2021055900 W IB 2021055900W WO 2022208148 A1 WO2022208148 A1 WO 2022208148A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
cutting element
longitudinal axis
endodontic instrument
cutting
Prior art date
Application number
PCT/IB2021/055900
Other languages
English (en)
Inventor
Gianluca PLOTINO
Eugenio Pedulla'
Original Assignee
Lg Innovation S.R.L.
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 Lg Innovation S.R.L. filed Critical Lg Innovation S.R.L.
Publication of WO2022208148A1 publication Critical patent/WO2022208148A1/fr

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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

  • This invention relates to a tool, an endodontic instrument for cleaning a dental cavity and a method for making the tool.
  • the instrument comprises the use of a tool made of metal material.
  • the tool comprises a propeller designed to come into contact with the dental cavity for cleaning the walls of the dental cavity.
  • the propeller of the instrument by rotating, allows removal of the detritus which is created in the cleaning, operating as a screw feeder.
  • the aim of the invention is to provide a tool, an endodontic instrument and a method for making the tool which overcome the above-mentioned drawbacks of the prior art.
  • the invention provides a tool for an endodontic instrument.
  • the tool comprises a body.
  • the body is elongate along a longitudinal axis between a first end, connectable to the endodontic instrument (that is, to a motor of the endodontic instrument), and a second end, opposite the first end.
  • the tool comprises a cutting element.
  • the cutting element comprises a maintaining portion, connected to the body.
  • the cutting element comprises a cutting portion, protruding from said body in a radial direction, perpendicular to the longitudinal axis of the body.
  • the cutting element extends along the longitudinal axis of the body between a first end, proximal to the first end of the body, and a second end, longitudinally spaced from the first end.
  • the cutting element is made of a metallic material.
  • the body includes a matrix made of plastic material.
  • the maintaining portion of the cutting element is embedded in the matrix.
  • the presence of the plastic matrix allows a flexibility of the tool, reducing the fractures and the micro-fractures.
  • the presence of the cutting element, in particular of the cutting portion allows a high level of cutting and cleaning efficiency. For this reason, the tool is effective and not very subject to failure.
  • the cutting element is a helical blade, having an extension along the longitudinal axis.
  • the helical blade also performs the function of removing detritus from the dental cavity.
  • the blade has a cone or truncated cone cross section, converging in the direction coming out of the longitudinal axis.
  • This feature makes it possible to obtain a connection point between the blade and the body which is thicker and thus more resistant to bending stresses, thus further reducing the possibility of failure of the blade.
  • the maintaining portion comprises one or more slots. Said one or more slots are filled by the plastic material of the matrix of the body.
  • the body comprises a connecting surface, at the first end of the body.
  • the body comprises a lateral surface, on which the cutting tool is embedded.
  • the body comprises a tip surface, at the second end of the body.
  • the tool comprises a pumping hole.
  • the pumping hole includes an inlet opening, preferably made on the connection surface, to connect the pumping hole to a pump of the endodontic instrument.
  • the pumping hole comprises a dispensing opening, made on the lateral surface, for dispensing a fluid.
  • the dental cavity is also cleaned through a flow of washing fluid which facilitates removal of detritus.
  • the pumping of washing fluid may be continuous or intermittent.
  • the pumping hole comprises an additional dispensing opening, to form a plurality of dispensing openings.
  • At least two dispensing openings of said plurality of dispensing openings are spaced along the longitudinal axis. Moreover, at least two dispensing openings of said plurality are angularly spaced relative to the longitudinal axis.
  • the cutting element is defined by a plurality of blades oriented longitudinally and angularly spaced from each other. Each blade extends along the longitudinal axis of the body between a respective first end, proximal to the first end of the body, and a respective second end, proximal to the second end of the body.
  • this invention provides an endodontic instrument for cleaning a dental cavity.
  • the instrument comprises a container, including a connector.
  • the instrument comprises an actuator, located inside the container.
  • the instrument comprises a tool, connected to the connector.
  • the tool is connected to the actuator for being moved.
  • the tool is a tool which includes one or more of the features described in the invention.
  • the endodontic instrument comprises a pump, designed to pump (continuously or intermittently) a washing fluid into the pumping hole of the tool.
  • the invention provides a method for making a tool for an endodontic instrument.
  • the method comprises a step of preparing a cutting element made of metal, comprising a maintaining portion and a cutting portion.
  • the method comprises a step of preparing a body, elongate along a longitudinal axis between a first end, connectable to endodontic instrument, and a second end, opposite the first end.
  • the body has a matrix made of plastic material, with the portion for maintaining the cutting element embedded in the matrix. In that way, the cutting element extends along the longitudinal axis of the body between a first end, proximal to the first end of the body, and a second end, longitudinally spaced from the first end.
  • the body is made by injection co-moulding on the cutting element.
  • the step of moulding the body comprises a step of making a pumping hole including an inlet opening, designed to receive a washing fluid from the endodontic instrument, and a dispensing opening, from which the washing fluid can be dispensed towards a dental cavity.
  • FIG. 1 illustrates an endodontic instrument for cleaning a dental cavity
  • FIG. 2 illustrates an embodiment of a tool of the instrument of Figure 1 ;
  • FIG. 3 illustrates a cross section of a detail of the tool of Figure 2;
  • FIG. 4 illustrates a cross section of a detail of a further embodiment of the tool of Figure 2;
  • FIG. 5 illustrates an enlargement of a detail of a cutting element of Figure 4.
  • FIG. 6 and 7 illustrate perspective views of a first embodiment and a second embodiment, respectively, of the tool of Figure 2.
  • the number 100 indicates an endodontic instrument for filling a dental cavity.
  • the instrument 100 can be used both to perforate a tooth, in order to remove the dental material contained therein or to clean and scrape the walls of a tooth that is already perforated and in which the dental cavity has already been made.
  • the instrument 100 comprises a container 101 , defining an internal space VI.
  • the container 101 comprises a handgrip to be handled by a user.
  • the container 101 is not inside the endodontic instrument, that is to say, it is an outer container 101 which, by means of a dedicated pump, circulates the fluid towards the tooth passing through a cavity made inside the instrument.
  • the connector is elongate along an axis of extension.
  • the instrument 100 comprises an actuator 102.
  • the actuator 102 is preferably a rotary actuator.
  • the actuator 102 is positioned inside the internal space VI.
  • the rotary actuator 102 is connectable to a tool 1 to place it in rotation.
  • the instrument 100 comprises a first button 102', connected to the actuator 102 and selectable for starting or interrupting the actuator on request.
  • the button 102' is positioned on the outer surface of the container 101 so as to be accessible to the user.
  • the instrument 100 comprises a pump 103.
  • the pump 103 is configured to pump a washing fluid into the dental cavity through the tool 1.
  • the pump 103 comprises an activating pushbutton 103', positioned on the outer surface of the container 101 for allowing a user to start or interrupt the pump on request.
  • the activating button 103' could also be a voice actuator (that is, a voice command or a Bluetooth command, connectable to a cordless pedal in such a way as to be able to activate and deactivate even simultaneously whilst a cutting tool is used, without necessarily having to use a hand for pressing a button).
  • a voice actuator that is, a voice command or a Bluetooth command, connectable to a cordless pedal in such a way as to be able to activate and deactivate even simultaneously whilst a cutting tool is used, without necessarily having to use a hand for pressing a button).
  • the pump 103 comprises a connector 103" to an external washing fluid supply.
  • a tank may be present inside the container 101 which contains washing fluid.
  • the instrument 100 comprises a plurality of tanks, each of which comprises a respective washing fluid.
  • the instrument 100 comprises a connection zone ZC, to which the tool 1 is connectable.
  • the invention provides a tool 1.
  • the tool 1 comprises a body 2.
  • the body 2 comprises a matrix made of plastic material.
  • the matrix made of plastic material may be doped with metallic particles of various types, for example to increase the resistance to abrasion of the body 2.
  • the body 2 is an elongate body along a longitudinal axis A between a first end 2A and a second end 2B. According to an embodiment, the body 2 has a cone or truncated cone shape converging in the direction oriented from the first end 2A to the second end 2B.
  • the longitudinal axis A is parallel to the axis of extension of the container 101. According to other embodiments, the longitudinal axis A is inclined relative to the axis of extension of the container 101.
  • the body 2 comprises a connecting surface 21 , oriented towards the connection zone ZC of the container 101.
  • the tool 1 comprises a suction device, configured for sucking the fluid and/or the detritus, raising from the tool 1. More specifically, according to an embodiment, the suction device is a suction ring, positioned at the connection zone ZC and surrounding, at least partly or completely, the body 2 of the tool 1.
  • the body 2 comprises a tip surface 22, oriented in the opposite direction to the connecting surface 21.
  • the body 2 comprises a lateral surface 23, joined to the tip surface 22 and to the connecting surface 21.
  • the body 2 comprises a shank 25.
  • the shank 25 extends along the longitudinal axis A, starting from the first end 2A of the body 2 to an intermediate position 2C, interposed between the first end 2A and the second end 2B.
  • the shank 25 has a cylindrical lateral surface.
  • the tool 1 comprises a cutting element 3.
  • the cutting element 3 is configured to come into contact with the dental cavity and to be inserted into the dental root canals to remove and/or scrape the walls of the dental cavity.
  • the cutting element 3 comprises a maintaining portion 3A, connected to the body 2.
  • the maintaining portion 3A is embedded in the body 2.
  • the maintaining portion 3A is surrounded by the plastic matrix of the body 2.
  • the cutting element 3 comprises a cutting portion 3B.
  • the cutting portion 3B protrudes from the body 2 in a direction coming out of the longitudinal axis A.
  • the maintaining portion 3A and the cutting portion 3B are formed as a single piece and are not two separate parts. They are identified by the fact that one (maintaining portion 3A) is inside the matrix, whilst the other (cutting portion 3B) is outside the plastic matrix.
  • the maintaining portion 3A has a radial extension which is 20% greater than the total radial extension of the cutting element 3.
  • the maintaining portion 3A has a radial extension of between 30% and 60% of the total radial extension of the cutting element 3.
  • the cutting element 3 is a helical blade which extends along the longitudinal direction A between a first end 3A and a second end 3B.
  • the first end 3A is close to the first end 2A of the body 2 (and is therefore close to the container 101 of the instrument 100).
  • the body 2 and the helical blade 3 define a continuous spiral which extends from the first end 2A of the body to the second end 2B of the body.
  • the profile of the helical blade 3 on a radial cutting plane is a cone or truncated cone, converging in the direction coming out from the longitudinal axis A.
  • the cutting element 3 is defined by a plurality of blades 31 spaced at angular intervals from each other. More specifically, according to an embodiment, each blade 31 extends along the longitudinal axis A between a first end 31 A, proximal to the first end of the body 2A, and a second end 31 B, proximal to the second end of the body 2B.
  • Each blade 31 comprises a respective maintaining portion PM and a respective cutting portion PT.
  • said plurality of blades 31 is a plurality of helical blades, which are spaced from each other along the longitudinal axis A and/or angularly relative to the longitudinal axis A.
  • the cutting element 3 extends, along the longitudinal axis A, from the intermediate position 2C of the body 2 to the second end 2B of the body 2. For this reason, the shank 25 does not have the cutting element 3, which is positioned only on the end part (proximal to the tooth) of the body 2.
  • the cutting element 3 comprises one or more slots 32. Said one or more slots are made in the maintaining portion PM of the cutting element 3. Said one or more slots 32 preferably pass through the cutting element 3 in such a way as to allow the plastic matrix to flow through and fill it.
  • the tool 1 comprises a handle 5.
  • the handle 5 is positioned, along the longitudinal axis A, upstream of the first end 2A of the body.
  • the handle 5 is connected to the first end 2A of the body 2.
  • the handle 5 is configured for connecting to the connection zone ZC of the instrument 100.
  • the tool 1 comprises a pumping hole 4, which extends along the longitudinal axis A between an inlet opening 41 and a dispensing opening 42.
  • the inlet opening 41 is made on the connecting surface 21 and is configured to receive the washing fluid from the pump 103 of the instrument 100.
  • the dispensing opening 42 is preferably made in the lateral surface 23 of the body 2. According to an embodiment, the dispensing opening 42 is positioned between two successive propellers of the helical blade.
  • the dispensing opening 42 is positioned in the space between two blades 31.
  • the body 2 comprises a cutting side and a washing side.
  • the cutting side is configured to house the cutting element 3 (which may have the shape of a spiral elongate along the longitudinal direction or a rectilinear shape along the longitudinal direction).
  • the washing side is free of the cutting element 3 and includes said dispensing opening 42, to allow the pumping of the washing fluid.
  • the cutting side and the washing side are offset by 180A from each other along the longitudinal axis A, each extending angularly for 180A.
  • the cutting side has an angular extension between 180A and 270A, whilst the washing side has an angular extension between 180A and 90A.
  • the tool 1 rotating, allows an alternating of the washing and cutting which considerably increases the efficiency of the instrument.

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  • 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)

Abstract

L'invention concerne un outil (1) pour un instrument endodontique (100) comprenant : un corps (2), allongé le long d'un axe longitudinal (A) entre une première extrémité (2A), pouvant être reliée à l'instrument endodontique (100), et une deuxième extrémité (2B), opposée à la première extrémité (2A) ; un élément de coupe (3), comprenant une portion de maintien (PM) relié au corps (2), et une portion de coupe (PT), faisant saillie à partir du corps (2) dans une direction radiale (R), perpendiculaire à l'axe longitudinal (A) du corps (2), l'élément de coupe (3) s'étendant le long de l'axe longitudinal (A) du corps (2) entre une première extrémité (3A), proximale à la première extrémité (2A) du corps (2), et une deuxième extrémité (3B), espacée longitudinalement de la première extrémité (3A). L'élément de coupe (3) est constitué d'un matériau métallique et le corps (2) comprend une matrice en matière plastique. La portion de maintien (PM) de l'élément de coupe (3) est incorporée dans la matrice.
PCT/IB2021/055900 2021-03-29 2021-07-01 Instrument endodontique comprenant un outil en plastique et métal WO2022208148A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202100007664 2021-03-29
IT102021000007664 2021-03-29

Publications (1)

Publication Number Publication Date
WO2022208148A1 true WO2022208148A1 (fr) 2022-10-06

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ID=76807932

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2021/055900 WO2022208148A1 (fr) 2021-03-29 2021-07-01 Instrument endodontique comprenant un outil en plastique et métal

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WO (1) WO2022208148A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5104316A (en) * 1990-04-19 1992-04-14 Mcspadden John T Endodontic instrument
US20020006599A1 (en) * 2000-06-01 2002-01-17 Davidson James A. Break-resistant composite endodontic instrument
US20120276500A1 (en) * 2005-07-18 2012-11-01 Werner Mannschedel Root canal instrument and method of making the root canal instrument

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5104316A (en) * 1990-04-19 1992-04-14 Mcspadden John T Endodontic instrument
US20020006599A1 (en) * 2000-06-01 2002-01-17 Davidson James A. Break-resistant composite endodontic instrument
US20120276500A1 (en) * 2005-07-18 2012-11-01 Werner Mannschedel Root canal instrument and method of making the root canal instrument

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