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WO2008119119A1 - Boîtier orthodontique - Google Patents

Boîtier orthodontique Download PDF

Info

Publication number
WO2008119119A1
WO2008119119A1 PCT/AU2008/000450 AU2008000450W WO2008119119A1 WO 2008119119 A1 WO2008119119 A1 WO 2008119119A1 AU 2008000450 W AU2008000450 W AU 2008000450W WO 2008119119 A1 WO2008119119 A1 WO 2008119119A1
Authority
WO
WIPO (PCT)
Prior art keywords
base
face
bracket
adjustment
orthodontic bracket
Prior art date
Application number
PCT/AU2008/000450
Other languages
English (en)
Inventor
M. Ali Darendeliler
David Armstrong
Original Assignee
The University Of Sydney
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
Priority claimed from AU2007901705A external-priority patent/AU2007901705A0/en
Application filed by The University Of Sydney filed Critical The University Of Sydney
Publication of WO2008119119A1 publication Critical patent/WO2008119119A1/fr

Links

Classifications

    • 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
    • A61C7/14—Brackets; Fixing brackets to teeth
    • A61C7/146—Positioning or placement of brackets; Tools therefor

Definitions

  • An orthodontic bracket as well as a base and face for the bracket are disclosed.
  • Orthodontic brackets are used in orthodontic treatments. They are bonded to the teeth of a patient using adhesive and feature a groove which receives a wire. Typically, a number of brackets are applied to adjacent teeth and a wire is passed through the grooves of the brackets to effect movement of teeth over a period of time. Initially a flexible wire is used and then, after a time when the teeth have become straighter, a stiff wire is passed through the bracket grooves.
  • bracket If the bracket is not repositioned then compensation bends need to be placed in the arch wire, which is time consuming and increases treatment time.
  • an orthodontic bracket that includes a face and a base. Following the application of sufficient energy, the face is repositionable with respect to the base.
  • a base for an orthodontic bracket the base being adapted such that, following the application of sufficient energy, a face for the bracket can be repositioned with respect to the base.
  • a face for an orthodontic bracket the face being adapted such that, following the application of sufficient energy, the face can be repositioned with respect to a base of the bracket.
  • the base may include a layer of a material which is deformable following application of the sufficient energy.
  • the base may include a substrate which remains in a solid state when the material is in a deformable state.
  • the substrate may be formed from metal.
  • the metal may be selected from nickel phosphor bronze, stainless steel, nickel titanium, titanium or gold alloy.
  • the material for the substrate is not at all limited to a metal and may be formed from eg. a ceramic or polymer, etc that does not deform when the material is in a deformable state.
  • the deformable material may comprise the base, whereby part of the base to which the face is connected deforms with the application of sufficient energy.
  • the deformable material can comprise a polycarbonate, or a polystyrene.
  • other materials can be employed including so-called smart plastics which change shape with the application of light thereto, or which have shape memory in that they can change shape in response to a temperature increase.
  • the material may be of a type that deforms with the application of energy in the form of heat. Alternatively, it may deform in response to an electrical current applied thereto or therethrough, or responsive to incident electromagnetic radiation (such as UV-light), or responsive to a chemical reaction or change of chemical state, etc.
  • the base may include an undercut region which can provide mechanical engagement with the face
  • the face may be repositionable to effect one of more of a vertical adjustment, a mesiodistal adjustment, a tip adjustment, or a bucco-lingual adjustment.
  • the face may also be formed from metal.
  • the metal may again be selected from nickel phosphor bronze or stainless steel.
  • Figure l is a top view of a base for an orthodontic bracket according to a first embodiment
  • Figure 2 is an underside view of the base of Figure 1;
  • Figure 3 is a side view of the base of Figure 1;
  • Figure 4 is another side view of the base of Figure 1;
  • Figure 5 is a side view of a face for an orthodontic bracket according to the first embodiment
  • Figure 6 is another side view of the face of Figure 5;
  • Figure 7 is a top view of the face of Figure 5;
  • Figure 8 is an underside view of the face of Figure 5;
  • Figure 9 is a top view showing the base of Figure 1 assembled with the face of Figure 5;
  • Figure 10 is a side view of Figure 9;
  • Figure 11 is another side view of Figure 9;
  • Figure 12 depicts the opposite side view of Figure 11;
  • Figures 13 A and 13B are respectively perspective and cross-sectional views of the substrate of Figure 1 ;
  • Figure 14 is a perspective view of the face shown in Figure 5;
  • Figure 15 illustrates vertical, mesiodistal and tip adjustments;
  • Figure 16 is a side view of the orthodontic bracket of Figure 9 arranged on a tooth and illustrating schematically a bucco-lingual adjustment of the face with respect to the base;
  • Figure 17 is a front view of the orthodontic bracket of Figure 16 arranged on a tooth and illustrating schematically a tip adjustment by rotating the face with respect to the base.
  • Base 10 for such an orthodontic bracket is shown.
  • Base 10 includes a substrate 11 formed from stainless steel.
  • Substrate 11 includes a recess 12 in which is housed a layer of a material which is deformable after application of sufficient heat energy in the form of polystyrene or polycarbonate 30.
  • Substrate 11 includes a series of projections 14 on one surface. This surface is intended to be bonded to a tooth in use and the projections provide a key for the bonding adhesive to improve bond strength.
  • undercut region 32 is provided about recess 12. This undercut assists to retain the polystyrene and can provide mechanical engagement with a projection 22 of the face 20, by way of the projection becoming partially inserted into the undercut region. Depending upon the position of the face, this can increase the strength of a resulting bracket assembly.
  • the substrate 11 is first cast from stainless steel. A 0.8 mm thick sheet of polystyrene is cut to produce a piece 4mm x 4mm. The piece of polystyrene is placed onto substrate 11 overlying recess 12 and then the two are placed in an oven at 100 degrees centigrade, which is the glass transition temperature of the polystyrene. Once the polystyrene is softened, substrate 11 is removed from the oven, the polystyrene is packed into the undercut region 32 of the substrate, and the polystyrene 30 solidifies in recess 12.
  • Face 20 includes a projection 22 and tie wings 24.
  • the tiewings define grooves 26 which have a generally square cross section. In use, these grooves receive an archwire of square cross section in a conventional manner.
  • the tie wings can include undercuts for the placement of an O-ring to hold the archwire in place.
  • Projection 22 is dimensioned to fit inside recess 12 of base 10 and to fit inside undercut region 32 as may be required, depending upon the position of face 20 with respect to base 10.
  • the face 20 can also be modified to include hooking points for a tooth anchoring assembly. This can anchor the face and thus the tooth orientation with respect to eg. a user's jaw (eg. for facial reconstruction surgery). Hooks at the hooking points can be used for attachment of auxiliaries such as elastics or coil springs to move the teeth.
  • Elastics can be used intra-arch or inter-arch. When coil springs are employed they are used inter-arch.
  • Face 20 is assembled to base 10 by pressing projection 22 into the polystyrene layer 30 whilst the face is being heated.
  • the assembly is then re-introduced into the oven at 100 degrees centigrade for several minutes, removed and then allowed to cool.
  • polystyrene layer 30 hardens.
  • the resulting assembly is an orthodontic bracket 100 and is shown in Figures 9 to 12 and 15 to 17.
  • Orthodontic bracket 100 fits to the teeth of a patient by bonding surface 14 to the teeth in the usual manner.
  • adjustments can be effected without the need to debond the bracket.
  • energy such as heat energy is applied to the bracket to raise the temperature of the polystyrene above its glass transition temperature. This allows deformation of the polystyrene and so the face 20 can be repositioned with respect to the base.
  • the polystyrene cools, it hardens and the groove 26 is fixed in its new position.
  • a bracket 100 is shown affixed to a schematic representation of a tooth 110. Whilst the polystyrene is deformable, the following adjustments can be made: • Vertical adjustment by moving the face in the direction of arrows A
  • the bracket 100 is shown affixed to a tooth T.
  • This Figure illustrates the face 20 being moved bucco-lingually from the base 10 whilst the polystyrene is deformable. This adjustment is desirable in some situations and can be achieved by twisting the wire so that a section is rotated relative to the rest of the wire whilst remaining in the same plane. It can be referred to as "torque” and moves the root buccally (buccal/labial root torque) or lingually/palatally (palatal/lingual root torque). The movement can be considered as a modification of the slot relative to the base so as to effect a change in the torque (buccal/ labial root torque or palatal/lingual root torque).
  • the lines in Figure 16 also demonstrate that the force on the bracket base is not a 100% shear despite a force being applied parallel to the long axis of the teeth.
  • bracket 100 is also shown affixed to a tooth T.
  • This Figure illustrates the face 20 being rotated with respect to the base 10 whilst the polystyrene is deformable.
  • the intermediate material used was polystyrene or polycarbonate.
  • other intermediate materials could be used including poly(vinylchloride), poly(methyl methacrylate), poly(ether ketone), etc.
  • One factor for material selection is that the glass transition temperature of the material is higher than the highest extreme temperature experienced in the mouth, which is approximately 70°C.
  • the intermediate material may optionally be in the form of a so-called “smart plastic” which can automatically change shape in response to energy sources such as eg. light and/or temperature and/or chemical sources.
  • plastics can include molecular "switches” which can comprise photosensitive groups that are grafted onto a polymer network.
  • the resulting photosensitive polymer can have an external stress applied thereto when the bracket is first formed so that, when illuminated with ultraviolet light of a certain wavelength, the molecular switches crosslink, or bind one to another, causing a predetermined shift (eg. one of more of a vertical adjustment, a mesiodistal adjustment, a tip adjustment, an angled adjustment).
  • the substrate and face were formed from stainless steel. Similarly, they could be formed from nickel phosphor bronze.
  • the substrate and face may be formed from materials such as plastic, ceramic or titanium based materials (aesthetic, bio-compatible and anti- allergic).
  • the base is formed entirely from the intermediate material.
  • the base and face are formed entirely from the intermediate material whereby movement of the face is caused by eg. deforming just a certain intermediate region of the material (such as through the use of a smart plastic).

Landscapes

  • Health & Medical Sciences (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 porte sur un boîtier orthodontique (100) présentant une face (20) et une base (10). En appliquant une énergie suffisante, on peut repositionner la face par rapport à la base.
PCT/AU2008/000450 2007-03-30 2008-03-28 Boîtier orthodontique WO2008119119A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007901705 2007-03-30
AU2007901705A AU2007901705A0 (en) 2007-03-30 An orthodontic bracket

Publications (1)

Publication Number Publication Date
WO2008119119A1 true WO2008119119A1 (fr) 2008-10-09

Family

ID=39807717

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000450 WO2008119119A1 (fr) 2007-03-30 2008-03-28 Boîtier orthodontique

Country Status (1)

Country Link
WO (1) WO2008119119A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014036343A1 (fr) * 2012-08-30 2014-03-06 Rahimi Hessam Système de bagues dynamique
US9119693B2 (en) 2012-08-30 2015-09-01 Hessam Rahimi Dynamic bracket system
US9408676B2 (en) 2012-08-30 2016-08-09 Hessam Rahimi Dynamic bracket system
WO2018140771A1 (fr) 2017-01-27 2018-08-02 The University Of North Carolina At Chapel Hill Office Of Commercialization And Economic Development Supports orthodontiques, systèmes et procédés
US20220304778A1 (en) * 2018-04-25 2022-09-29 LightForce Orthodontics Inc. Constant depth fracture groove
US11890157B2 (en) 2018-06-12 2024-02-06 Lightforce Orthodontics, Inc. Ceramic processing and design for the direct manufacture of customized labial and lingual orthodontic clear aligner attachments

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443190A (en) * 1981-10-30 1984-04-17 Kurz Craven H Thermoplastic orthodontic arch wire retaining annular ligature and process
US4597739A (en) * 1985-05-21 1986-07-01 Farel Rosenberg Tow element bracket system for true straight wire orthodontics
US4676746A (en) * 1986-06-03 1987-06-30 Lewis Klapper Adjustable orthodontic bracket assembly
US5954502A (en) * 1998-08-03 1999-09-21 Tuenge; Rodney C. Adjustable orthodontic bracket assembly with continuous adjustment in any one of six planes of motion
US6663385B2 (en) * 2001-12-20 2003-12-16 Harry W. Tepper Orthodontic snap-in bracket

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4443190A (en) * 1981-10-30 1984-04-17 Kurz Craven H Thermoplastic orthodontic arch wire retaining annular ligature and process
US4597739A (en) * 1985-05-21 1986-07-01 Farel Rosenberg Tow element bracket system for true straight wire orthodontics
US4676746A (en) * 1986-06-03 1987-06-30 Lewis Klapper Adjustable orthodontic bracket assembly
US5954502A (en) * 1998-08-03 1999-09-21 Tuenge; Rodney C. Adjustable orthodontic bracket assembly with continuous adjustment in any one of six planes of motion
US6663385B2 (en) * 2001-12-20 2003-12-16 Harry W. Tepper Orthodontic snap-in bracket

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014036343A1 (fr) * 2012-08-30 2014-03-06 Rahimi Hessam Système de bagues dynamique
US9119693B2 (en) 2012-08-30 2015-09-01 Hessam Rahimi Dynamic bracket system
US9192453B2 (en) 2012-08-30 2015-11-24 Hessam Rahimi Dynamic bracket system
US9408676B2 (en) 2012-08-30 2016-08-09 Hessam Rahimi Dynamic bracket system
WO2018140771A1 (fr) 2017-01-27 2018-08-02 The University Of North Carolina At Chapel Hill Office Of Commercialization And Economic Development Supports orthodontiques, systèmes et procédés
EP3573567A4 (fr) * 2017-01-27 2020-10-28 The University of North Carolina at Chapel Hill Supports orthodontiques, systèmes et procédés
US20220304778A1 (en) * 2018-04-25 2022-09-29 LightForce Orthodontics Inc. Constant depth fracture groove
US11872101B2 (en) 2018-04-25 2024-01-16 Lightforce Orthodontics, Inc. Manufacture of patient-specific orthodontic brackets with improved base and retentive features
US12016744B2 (en) * 2018-04-25 2024-06-25 Lightforce Orthodontics, Inc. Constant depth fracture groove
US20240293202A1 (en) * 2018-04-25 2024-09-05 Lightforce Orthodontics, Inc. Systems and methods for orthodontic bracket design
US11890157B2 (en) 2018-06-12 2024-02-06 Lightforce Orthodontics, Inc. Ceramic processing and design for the direct manufacture of customized labial and lingual orthodontic clear aligner attachments

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