US20170196660A1 - Variable cross-sectioned orthodontic archwire equipped with integrated hook - Google Patents

Variable cross-sectioned orthodontic archwire equipped with integrated hook Download PDF

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Publication number
US20170196660A1
US20170196660A1 US15/317,152 US201515317152A US2017196660A1 US 20170196660 A1 US20170196660 A1 US 20170196660A1 US 201515317152 A US201515317152 A US 201515317152A US 2017196660 A1 US2017196660 A1 US 2017196660A1
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United States
Prior art keywords
archwire
loop
hook
cross
region
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.)
Abandoned
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US15/317,152
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English (en)
Inventor
Jong Ho Lee
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.)
Lingualign Corp
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Lingualign Corp
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Publication of US20170196660A1 publication Critical patent/US20170196660A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
    • A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
    • A61C7/20—Arch wires
    • A61C7/22—Tension adjusting means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
    • A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
    • A61C7/20—Arch wires
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
    • A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
    • A61C7/28—Securing arch wire to bracket

Definitions

  • the present invention relates to an orthodontic archwire. More particularly, the present invention relates to a customized archwire for loop or sliding technique.
  • orthodontic therapy is to straighten crooked teeth by bonding brackets to the teeth and placing and ligating an archwire to slots of the brackets, wherein the teeth are corrected by retracting the teeth using a restoring force of the archwire or controlling torque of the archwire.
  • a method for retracting six anterior teeth usually employs a loop technique or a sliding technique.
  • the loop technique includes bending a portion of an archwire to form loops, ligating the archwire to brackets, and anchoring the hooks to the brackets by a ligating wire to produce a retraction force.
  • FIG. 1 is a view illustrating a process of forming a loop according to the related art.
  • a loop 1 ′ is formed by bending a portion of a wire 1 using a tool. If necessary, a wire hook 2 may be mounted to a portion of the wire beside the loop 1 ′.
  • the wire is ligated to brackets 4 bonded to patient's teeth.
  • FIG. 2A shows an early stage before the loop 1 ′ starts activation
  • FIG. 2B shows an advanced stage in which retraction of the teeth is completed.
  • the loop 1 ′ is supposed to be disposed at a center of both brackets. Actually, if the teeth are retracted by about 2 mm, the hook 2 abuts against the bracket 4 , so that the hook is not further retracted. As a result, the hook 2 already mounted should be removed from the wire, and a new hook should be mounted onto the wire beside the loop.
  • FIG. 2C shows a new stage in which activation starts again after the hook 2 is mounted onto the wire.
  • the wire hook 2 is commonly used even in the case of retracting the teeth by the sliding technique.
  • the sliding technique includes ligating an orthodontic archwire to brackets and linking a closed coil spring or an elastic power chain to a hook to produce a retraction force.
  • FIG. 3 shows a process of mounting a wire hook according to the related art.
  • a hook 2 is mounted to a proper location of the archwire 1 , and a closed coil spring is linked to the hook 2 to produce a traction force.
  • an object of the present invention is to provide an archwire which is formed integrally with hooks.
  • Another object of the present invention is to provide an archwire with a varied cross-sectional structure along a region to maximize conformance of a retraction wire.
  • the other object of the present invention is to provide an archwire capable of being customized by determining dimensions and kinds of a loop and a hook from coordinates of a space, from which a tooth is extracted, and bracket bonding locations which are figured out in advance from a setup model of patient's teeth.
  • an archwire with a varied cross section which is formed integrally with a hook, the archwire including: a customized archwire body corresponding to a setup model of patient's teeth; and the hook which protrudes from one side of the archwire body.
  • the hook is formed integrally with the archwire body, and the archwire body is formed in such a way that at least one region has a cross section different from that of other region.
  • the hook has a width which is equal to or smaller than that of a slot of a bracket.
  • the archwire body may be formed integrally with a loop.
  • a cross-sectional area of the loop is variably determined corresponding to the setup model of the patient's teeth, and an interval between the loop and the hook is preferably within 2 mm.
  • a location of each bracket is figured out from the setup model of the patient's teeth.
  • the shape of the archwire is obtained from the data, and then a plate is formed to fabricate the archwire.
  • the loop, the hook and the archwire are flush with each other by forming a plate.
  • the customized archwire with the varied cross section is fabricated by bending the loop at about 70 to 90 degrees according to an oral cavity condition of the patient.
  • a cross-sectional area of a posterior wire region of the archwire body may be configured to be larger than that of an anterior wire region.
  • An inter-bracket region of the archwire body may have a cross-sectional area smaller than that of a portion which is ligated to the slot of the bracket.
  • the archwire body may be formed integrally with a stop.
  • the stop may further protrude from the slot of the bracket as the archwire body is ligated to the slot of the bracket.
  • a portion of the stop protruding from the slot preferably has a T-shape, and one or more stops may be provided which protrude from the slots of the brackets for central incisor, lateral incisor or canine teeth.
  • the stop is fixed by a ligating wire, and serves to limit horizontally sliding movement of the archwire body in the slot of the bracket.
  • the archwire is made from Ti6Al4V-ELI material.
  • the cross-sectional area or cross-sectional shape of the archwire is varied along the region, there is provided the archwire formed integrally with the loop, the hook or the stop.
  • the customized archwire can be fabricated only by easily determining the thickness, the length and the kind of the loop and the hook based on bracket bonding positions which are figured out from the setup model of the patient's teeth, and coordinates of a tooth extracting space.
  • FIG. 1 is a view illustrating a process of forming a loop according to the related art.
  • FIG. 2 is a view illustrating a process of activating the loop according to the related art and a drawback thereof.
  • FIG. 3 is a view illustrating a process of mounting a wire hook according to the related art.
  • FIG. 4 is a view schematically illustrating an archwire with a varied cross section which is formed integrally with hooks according to one embodiment of the present invention.
  • FIG. 5 is an enlarged view illustrating a loop and a hook of the archwire in FIG. 4 .
  • FIG. 6 is an enlarged view illustrating a process of fabricating the archwire in FIG. 4 and a cross-sectional structure thereof.
  • FIG. 7 is an enlarged view illustrating the archwire in FIG. 4 which is ligated to a slot of a bracket.
  • FIG. 8 is a view illustrating examples of loops which can be applied to the present invention and cannot be applied to the present invention.
  • FIG. 9 is a view schematically illustrating an archwire with a varied cross section which is formed integrally with hooks according to another embodiment of the present invention.
  • FIG. 10 is a view illustrating the archwire in FIG. 9 which is ligated to slots of brackets.
  • FIG. 11 is a view of a modified embodiment of the hook.
  • An orthodontic archwire with a varied cross section which is formed integrally with hooks according to the present invention has a cross section varied along a region, contrary to an orthodontic archwire according to the related art.
  • a loop, a hook or a stop can be formed by reducing a cross-sectional area of an inter-bracket region or varying a cross section of a desired region.
  • cross-sectional area can be varied by dividing the wire into an anterior region and a posterior region.
  • the present invention can be applied to a customized orthodontic appliance.
  • the archwire according to the present invention is ligated to a customized bracket.
  • the orthodontic archwire with the varied cross section according to the present invention is formed integrally with at least one hook.
  • the orthodontic archwire has a rectangular wire of a rectangular cross-sectional structure, but a shape of the cross section of the archwire is varied along a region.
  • the orthodontic archwire with a varied cross section which is formed integrally with hooks according to the present invention will now be described in detail with reference to FIGS. 4 to 8 .
  • FIG. 4 is a view schematically illustrating the archwire with the varied cross section which is formed integrally with hooks according to one embodiment of the present invention.
  • the embodiment of the present invention is provided with an integral loop which is further formed within a desired distance from the hook, and can be applied to loop technique.
  • the archwire with the varied cross section which is formed integrally with the hooks according to the embodiment of the present invention at least one hook 120 and at least one loop 130 which are formed integrally with an archwire body 110 .
  • FIG. 4 relates to a customized archwire which is fabricated in view of a position of a bracket for each tooth or the like, in particular, an archwire for lingual orthodontic treatment when seen from the hook 120 facing an internal direction.
  • the orientation of the hook 120 is not limited, and, of course, the embodiment can be used as an archwire for buccolingual orthodontic treatment since the hook faces an external direction.
  • the location of the loop 130 is determined according to a location of a tooth extracting space of a patient.
  • a pair of loops 130 and a pair of hooks 120 are provided to be opposite to each other, but the locations are illustrated to help interesting.
  • the hook 120 and the loop 130 can be provided at only one side, or the location can be changed, according to whether a tooth is extracted or not, or a location where a tooth is extracted.
  • the loop 130 is formed in front of the tooth extracting space. If the loop is activated to retract the teeth, the tooth extracting space is closed. The loop 130 is positioned at the center between both brackets 4 .
  • FIG. 7 shows the state in which the archwire is ligated to the bracket after the tooth is extracted, and it can be recognized that the loop 130 is positioned before the tooth extracting space.
  • FIG. 5 is an enlarged view illustrating the loop and the hook of the archwire in FIG. 4 .
  • the archwire body 110 includes a rectangular cross-sectional structure, and the hook 120 and the loop 130 protrude from any one side among four sides of the archwire body 110 .
  • the hook 120 is arranged to be flush with the archwire body 110 , but the loop 130 is bent upwardly at an angle of about 70 to 90 degrees.
  • FIG. 6 A process of fabricating the archwire with the varied cross section which is formed integrally with the hooks according to the embodiment of the present invention will be more clearly understood from FIG. 6 .
  • FIG. 6 shows the shape of the archwire which is fabricated by shaping a plate of 0.18 inch in thickness.
  • a setup model of a patient is made, and then is converted into 3D data, thereby setting a location of a bracket for each tooth.
  • the location of the loop 130 is determined according to coordinates of the tooth extracting space. A kind of the loop 130 can be selected at this time.
  • FIG. 6 is showed in the shape of a delta loop, but various shapes of loops can be used.
  • FIG. 8 illustrates examples of loops which can be applied to the present invention and cannot be applied to the present invention.
  • FIG. 8A shows the loops including a bull loop, an open vertical loop, an omega loop, and a key hole loop, in order from the left in the figure, as well as the delta loop in FIGS. 4 to 6 , which can be applied to the present invention.
  • a height, a width and a thickness of the loop can be adjusted in order to impart a retraction force to the teeth when the wire is activated by 1 mm to 1.5 mm.
  • the adjustment of the height, the width and the thickness can be determined by simulation using dedicated software, in view of a space in an oral cavity of the patient.
  • an orthodontic wire of the related art is formed by manually bending a wire fabricated by a drawing method, it is not possible to adjust the thickness of the loop.
  • the present invention can achieve the retraction force by adjusting the height or the thickness of the loop, while the width of the loop remains intact.
  • the location and the kind of the hook 120 are set.
  • the hook 120 is set to have a width equal to or smaller than a width of a slot of the bracket 4 .
  • an interval between the hook 120 and the loop 130 is set within the range of 2 mm.
  • the interval between the hook 120 and the loop 130 is designed not to exceed the half thereof.
  • the orientation of the hook 120 can be changed according to the lingual orthodontic treatment or the buccolingual orthodontic treatment, and also can be changed according to the bending direction, i.e., inward bending or outward bending, of the loop 130 .
  • the shape of the archwire body 110 is derived therefrom. Then, locations, sizes and kinds of the hooks 120 and the loops 130 provided on the archwire body 110 are determined according to the tooth extraction and the location of the tooth extraction, and the shape as shown in FIG. 6 is shaped from a plate by electric discharge machining or laser machining.
  • the customized archwire is fabricated, as illustrated in FIG. 4 , by bending the loop 130 in FIG. 5 .
  • the archwire with the varied cross section which is formed integrally with the hooks according to the present invention has the cross-sectional shape varied along the region, as well as having the loops and stops which are formed integrally with the wire, the archwire cannot be fabricated by the drawing or extrusion method, but can be fabricated by the electric discharge machining or the laser machining.
  • TMA titanium molybdenum alloy
  • Ti6Al4V-ELI which is a kind of titanium alloys can be used in order to solve the above problem of the high frictional resistance, as well as being capable of being shaped from a plate.
  • Ti6Al4V-ELI is not used as a material for the orthodontic wire. However, it is proved that the material is suitable for the orthodontic archwire with the varied cross-sectional structure according to the present invention, because of the easy machining and the high compatibility with a human body.
  • Ti6Al4V-ELI has stiffness of about 0.56, which corresponds to a middle level between Nitinol of 0.17 and stainless steel of 1.
  • the archwire with the varied cross section which is formed integrally with the hooks according to the present invention can be fabricated by forming a metal plate made of Ti6Al4V-ELI having a desired thickness (e.g., 0.018 inch). Since the loop 130 is not formed by manually bending the wire, it cannot be applied to an overlapped loop (multi-loop).
  • FIG. 8B shows the loops including a closed helix loop, a double-delta closing loop, a closed horizontal loop, and closed T loop in order from the left in the figure.
  • Any loop which is not overlapped and can be fabricated by forming the plate can be applied to the archwire with the varied cross section which is formed integrally with the hooks according to the present invention. However, if there is an overlapped region, it cannot be applied to the present invention.
  • FIG. 7 shows the archwire according to the embodiment which is ligated to the slot of the bracket and is activated.
  • FIG. 7 illustrates the state in which the archwire with the varied cross section which is formed integrally with the hooks according to the present invention is ligated to the brackets 4 , and it can be recognized that the loop 130 is positioned in front of the tooth extracting region.
  • the archwire body 110 has a height of 0.018 inch which is equal to that of the slot of the bracket 4 , and a width which is equal to or slightly larger than that of the slot of the bracket 4 .
  • the archwire body 110 can have the width of 0.029 inch or 0.035 inch along the region, as illustrated in FIG. 6 .
  • the hook 120 has a height of 0.018 inch which is equal to that of the slot of the bracket 4 , so that the hook 120 does not abut against the slot of the bracket 4 for molar teeth in the process of retracting the anterior teeth.
  • the loop 120 and the hook 130 can be formed to have a sufficient small size, thereby solving a problem in that whenever the teeth are retracted by about 1 to 2 mm, the hook should be detached and mounted onto the wire.
  • the archwire with the varied cross section which is formed integrally with the hooks according to the present invention may include a stop 140 protruding from one side of the archwire body 110 , as illustrated in FIG. 7 .
  • the stop 140 may further protrude from the slot of the bracket, as the archwire body 110 is ligated to the slot of the bracket.
  • the portion protruding from the slot may be formed of a T-shape, as illustrated in FIG. 7 .
  • the stop 140 may be provided at a position corresponding to the slot of the bracket for central incisor, lateral incisor or canine so as to further protrude from the slot of interest.
  • One or more stops may be provided on the wire.
  • the stop 140 is fixed by a ligating wire, as illustrated in FIG. 7 , and serves to limit horizontally sliding movement of the archwire body 110 in the slot of the bracket.
  • the stop 140 is formed integrally with the archwire body 110 .
  • the archwire in FIGS. 4 to 7 is customized for the lingual orthodontic treatment.
  • the portion ligated to the slot of the bracket 4 has the same size (e.g., 0.018 inch in height and 0.025 inch in width) as that of the slot so that the portion can be interference-fitted into the slot.
  • the cross-sectional area of the region between the brackets it is possible to allow the cross-sectional area of the region between the brackets to have the size smaller than the above size.
  • the width of the inter-bracket region can be set to 0.018 inch, while the height is fixed to 0.018 inch.
  • the wire can be designed to have the above size since the bracket ligating position can be figured out in advance through the setup model of the patient.
  • the archwire body 110 may be formed such that an anterior wire region 111 and a posterior wire region 112 have a different cross-sectional area on the basis of the loop 130 .
  • the cross-sectional area of the posterior wire region 112 can be increased by setting the width of the anterior wire region 111 to 0.029 inch and the width of the posterior wire region 112 to 0.035 inch while the height is fixed to 0.018 inch.
  • the loop may not support the force and thus be bent.
  • the archwire is formed integrally with the hook, and can be applied to the sliding technique.
  • FIG. 9 is a view schematically illustrating an archwire with a varied cross section which is formed integrally with hooks according to another embodiment of the present invention.
  • the archwire body 110 is provided with the hook 120 on one side thereof.
  • the archwire body 110 may be divided into an anterior region and a posterior region.
  • the archwire body 110 is divided into a portion which is ligated to posterior brackets, and a portion which is ligated to anterior brackets.
  • the cross-sectional area of the posterior wire region 112 can be set to be larger than that of the anterior wire region 111 .
  • FIG. 10 is a view illustrating the archwire in FIG. 9 which is ligated to the slots of the brackets.
  • the hook 120 faces upward, contrary to the embodiment illustrated in FIG. 7 .
  • An angle or location of the hook 120 may be optionally selected, and the embodiment in FIG. 10 corresponds to an example of the hook 120 commonly used for the sliding technique.
  • FIG. 11 is a view of a modified embodiment of the hook.
  • the hook 120 is ligated and tightened with a ligating wire to activate the loop 130 , and a shape or size of the hook is not limited.
  • FIG. 11 Various shapes of hooks in FIG. 11 can be used.
  • the hook is bent, as illustrated in FIG. 11D , to minimize feeling of irritation and discomfort within the narrow space of the oral cavity.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Public Health (AREA)
  • Dentistry (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Dermatology (AREA)
  • Medicinal Chemistry (AREA)
  • Transplantation (AREA)
US15/317,152 2015-07-07 2015-11-18 Variable cross-sectioned orthodontic archwire equipped with integrated hook Abandoned US20170196660A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2015-0096277 2015-07-07
KR1020150096277A KR101658320B1 (ko) 2015-07-07 2015-07-07 일체형 후크를 갖는 가변단면 아치와이어
PCT/KR2015/012398 WO2017007079A1 (ko) 2015-07-07 2015-11-18 일체형 후크를 갖는 가변단면 아치와이어

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US15/946,984 Continuation US10179036B2 (en) 2015-07-07 2018-04-06 Variable cross-sectioned orthodontic archwire equipped with integrated hook

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US15/946,984 Expired - Fee Related US10179036B2 (en) 2015-07-07 2018-04-06 Variable cross-sectioned orthodontic archwire equipped with integrated hook

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EP (1) EP3320876A4 (ko)
JP (1) JP2018519088A (ko)
KR (1) KR101658320B1 (ko)
CN (1) CN107949340A (ko)
WO (1) WO2017007079A1 (ko)

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US10179036B2 (en) 2019-01-15
KR101658320B1 (ko) 2016-09-20
JP2018519088A (ja) 2018-07-19
EP3320876A1 (en) 2018-05-16
WO2017007079A1 (ko) 2017-01-12
CN107949340A (zh) 2018-04-20
EP3320876A4 (en) 2019-01-30

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