WO2010105069A1 - Brackets orthodontiques jumeaux convertibles - Google Patents

Brackets orthodontiques jumeaux convertibles Download PDF

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Publication number
WO2010105069A1
WO2010105069A1 PCT/US2010/027005 US2010027005W WO2010105069A1 WO 2010105069 A1 WO2010105069 A1 WO 2010105069A1 US 2010027005 W US2010027005 W US 2010027005W WO 2010105069 A1 WO2010105069 A1 WO 2010105069A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
labial
arch wire
pair
cover
Prior art date
Application number
PCT/US2010/027005
Other languages
English (en)
Inventor
Dwight P. Schnaitter
Paul E. Lewis
Original Assignee
Ultradent Products, Inc.
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 Ultradent Products, Inc. filed Critical Ultradent Products, Inc.
Publication of WO2010105069A1 publication Critical patent/WO2010105069A1/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
    • 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
    • A61C7/282—Buccal tubes

Definitions

  • the present invention relates to orthodontic brackets. More specifically, the invention relates to convertible orthodontic brackets having a plurality of selectively removable cover portions that initially cover the arch wire slot.
  • Orthodontics is a specialized field of dentistry that involves the application of mechanical forces to urge poorly positioned or crooked teeth into correct alignment and orientation. Orthodontic procedures can be used for cosmetic enhancement of teeth, as well as medically necessary movement of teeth to correct underbites or overbites. For example, orthodontic treatment can improve the patient's occlusion and/or enhanced spatial matching of corresponding teeth.
  • Orthodontic brackets are small slotted bodies configured for direct attachment to the patient's teeth or, alternatively, for attachment to bands which are, in turn, cemented or otherwise secured around the teeth.
  • a curved arch wire is inserted into the bracket slots.
  • the arch wire acts as a template or track to guide movement of the teeth into proper alignment.
  • End sections of the arch wire are typically captured within tiny appliances known as tube brackets or terminal brackets, which are affixed to the patient's bicuspids and/or molars.
  • the remaining brackets typically include open arch wire slots and apply orthodontic forces by means of ligatures attached to the brackets and arch wire (e.g., by means of tie wings on the brackets).
  • the orthodontic brackets according to the present invention include a bracket base that includes an arch wire slot formed within the base, a first pair of tie wings extending occlusally and gingivally away from the arch wire slot, and a second pair of tie wings extending occlusally and gingivally away from the arch wire slot.
  • the bracket base further includes a first labial web cover that is integrally formed with the first pair of tie wings. The first web cover extends between the first pair of tie wings, covering a first labial portion of the arch wire slot.
  • a second labial web cover is integrally formed with the second pair of tie wings, extending between the second tie wings so as to cover a second labial portion of the arch wire slot.
  • each labial web cover is configured to be selectively removable (e.g., by peeling), exposing the initially covered labial side of the arch wire slot. Either or both removable covers can be selectively removed as desired to provide desired functionality.
  • the bracket base and web covers are advantageously formed as a single integral piece. In one embodiment they are manufactured by machining a suitable metal material, rather than by metal injection molding as is typically used in the manufacture of orthodontic brackets. In metal injection molding, a metal powder mixed with a binder material is injection molded, followed by sintering to drive off the binder, which causes the metal particles to hold together.
  • brackets rather than metal injection molding allows the use of stronger more dense metal materials, provides for a stronger and/or smaller finished product, and allows for greater precision and tighter tolerances with regard to bracket dimensions.
  • the use of stronger metals and more precise dimensional tolerances allows the brackets to have sufficient strength with less metal, allowing the brackets to be significantly smaller than existing brackets formed by metal injection molding.
  • the inventive brackets may preferably be formed of 17-4 and/or 17-7 class stainless steels, which exhibit greater strength and density than classes of stainless steel suitable for use in conventional metal injection molded orthodontic brackets.
  • the strength and density of metal objects formed by metal injection molding is further compromised as a result of micro air pockets present within the finished metal body after sintering.
  • providing two separate labial web covers allows the practitioner to selectively remove only one labial web cover while leaving the other intact.
  • Such a configuration may be useful, for example, when applying corrective forces to correct a severely rotated tooth. It also permits the practitioner to remove both web covers as desired, either initially or following treatment with one web cover removed and one intact.
  • Figure 1 is a perspective view of an exemplary convertible orthodontic bracket
  • Figure 2A is a cross-sectional cut-away view through a first plane on a first side of the bracket of Figure 1 ;
  • Figure 2B is a cross-sectional cut-away view through a second plane on the first side of the bracket of Figure 1 ;
  • Figure 3 is a perspective view of an alternative exemplary convertible orthodontic bracket
  • Figure 4 is a perspective view showing an exemplary convertible orthodontic bracket in use, bonded to a second bicuspid and with both web covers intact;
  • Figure 5A is a perspective view of the exemplary convertible orthodontic bracket of Figure 4, but with one of the labial web covers having been removed and one remaining intact;
  • Figure 5B is a perspective view of the exemplary convertible orthodontic bracket of Figure 5A, but with the remaining labial web cover having been removed.
  • the convertible orthodontic brackets of the present invention include a bracket base with an arch wire slot formed therein, a first pair of tie wings extending occlusally and gingivally away from the slot, a second pair of tie wings extending occlusally and gingivally away from the slot, a first labial web cover integrally formed with and extending between the first pair of tie wings, and a second and separate labial web cover integrally formed with and extending between the second pair of tie wings.
  • the bracket base may advantageously be formed by a machining process, in which the web covers and tie wings are formed by machining a single integral piece of metal. Manufacture by machining allows stronger, more dense metals to be employed than when manufacturing brackets by metal injection molding.
  • Bracket 100 includes a bracket base 102 with bonding pad 104 on the lingual surface of base 102. Bonding pad 104 may be formed integral with the other structures of bracket 100, or may be formed separately and then attached to bracket base 102 (e.g., by welding, brazing, or use of an adhesive).
  • Bracket base 102 includes an arch wire slot 106 formed within base 102 (i.e., first slot portion 106a and second slot portion 106b).
  • Bracket base 102 further includes a first pair of tie wings 108a, 108b and a second pair of tie wings HOa, HOb. Tie wings 108a and HOa extend occlusally away from slot 106, while tie wings 108b and 110b, as well as optional auxiliary hook 112, extend gingivally away from slot 106.
  • Bracket 100 may be characterized as a twin bracket, as it includes two pairs of tie wings (108a, 108b and HOa, 1 10b). An integral selectively removable labial web cover is provided with each pair of tie wings.
  • First tie wings 108a and 108b are formed integral with a first web cover 114a extending occlusally-gingivally between the first tie wings, covering first slot portion 106a of arch wire slot 106.
  • second tie wings 110a and 110b are formed integral with a second web cover 114b extending occlusally-gingivally between the second tie wings, covering the second slot portion 106b of arch wire slot 106.
  • arch wire slot 106 may be discontinuous, including separated first and second slot portions 106a and 106b.
  • bracket base 102 may be configured so as to initially provide a continuous arch wire slot 106 between first tie wings 108a, 108b and second tie wings 1 10a, 110b (e.g., by means of first and second web covers 114a and 114b converging at the center of the bracket, or closer to one side or the other).
  • Labial web covers 114a and 1 14b are each configured to be selectively removable from bracket 100, for example, by peeling away with pliers or other appropriate tool.
  • each labial web cover 114a, 1 14b includes two web regions 116, 118 of reduced cross-sectional thickness interconnecting a thicker central portion between opposite occlusal and gingival tie wing portions.
  • first cover 1 14a includes an occlusal connecting web region 116a of reduced cross-sectional thickness.
  • a gingival connecting web region 118a of reduced cross-sectional thickness is spaced apart from and generally parallel to region 116a.
  • the web regions 116a and 118a are separated by the thickened central portion of labial web cover 114a.
  • Second web cover 114b includes similar connecting web regions 116b and 1 18b defining localized regions of reduced cross- sectional thickness where the labial web cover 114b may be peeled away from bracket 100.
  • bracket 100 When bracket 100 is formed by machining, it is possible to form the connecting web regions so as to include variable thicknesses that change as one moves from the mesial edge towards the distal edge of the connecting web.
  • FIGs 2A-2B illustrate cross-sections at different locations on the mesial side of bracket 100 through tie wings 108a and 108b.
  • the extreme mesial edge of connecting web regions 116a and 118a may be machined so as to provide a minimum thickness, facilitating easier removal of the labial web cover from the mesial edge.
  • a cross section near the distal edge of connecting web regions 116a and 118a may advantageously be provided with greater thickness, providing an overall level of desired strength to the web cover so as to prevent premature and/or unintentional removal of the web.
  • Providing a variable, tapered thickness as illustrated allows a practitioner to begin peeling at the mesial edge, where web thickness is at a minimum, and continuing towards the thicker distal edge.
  • Such a variable tapered web thickness is difficult, if not a practical impossibility, to form using conventional metal injection molding techniques.
  • such a variable tapered thickness would be impractical with a metal injection molded bracket, as the unpredictable shrinkage associated with the manufacturing process would likely make it difficult or impossible to provide desired dimensional tolerances.
  • the amount of peeling force required to remove the web covers is between about 10 and about 30 lbs., more preferably between about 12 and about 28 lbs, and most preferably between about 17 and about 23 lbs.
  • Commercially available metal injection molded brackets are batch tested as a result of the inability to provide tight dimensional tolerances relative to web thickness. For example, such batch testing results in rejection of batches in which the web removal force is less than 10 lbs or greater than 30 lbs. As a result, a significant quantity of the manufactured brackets must be discarded. Any attempt to metal injection mold a bracket including a variable tapered thickness would be impractical, as the rejection rates would likely be even higher.
  • manufacture by machining allows for significantly improved dimensional tolerances, which tolerances directly affect the force required for web removal.
  • the machined brackets could easily be price competitive with existing metal injection molded brackets, but include a much narrower range of force required for web removal (e.g., about 17 lbs to about 23 lbs). Such an improvement would be appreciated by practitioners, as the bracket's performance would be significantly more predictable.
  • the brackets are preferably formed by machining, rather than a metal injection molding process. Machining the brackets rather than metal injection molding allows use of stronger, more dense metal materials, which materials are not suitable for use in metal injection molding. Use of the stronger, more dense metal materials (e.g., 17-4 and/or 17-7 class stainless steels) provides for a stronger, more dense finished product. In addition, 17-4 and 17-7 class stainless steels may be heat treated after machining to further increase strength. Such heat treatments are not possible using classes of stainless steels suitable for use in metal injection molding.
  • metal injection molded brackets are formed from stainless steel powder materials (e.g., 303, 304, and/or 316L class stainless steels) which although they are better suited for powderization and sintering, exhibit less strength and lower density.
  • the strength and density of actual finished brackets formed by metal injection molding is less than the bulk strength and density of the metal materials employed as micro air pockets can form during molding and sintering, and the strength of the finished article may be reduced as the sintering process may result in weak bonding of the metal powder. No such issues occur when machining a bulk metal material.
  • FIG. 1 illustrates such an embodiment of a bracket 100' including perforations 117.
  • Figures 4-5B illustrate an exemplary method of using convertible orthodontic brackets according to the disclosure.
  • bracket 100 is bonded to a patient's tooth (e.g., a bicuspid).
  • convertible twin brackets will be used on bicuspids and/or cuspids during treatment, although they may also be used on other teeth.
  • convertible twin bracket 100 may be bonded to the second bicuspid 150 while arch wire 152 is terminated in a conventional tube bracket 154 bonded to the first molar 156.
  • arch wire 152 is shown as having a relatively thin, rounded cross-section. Such an arch wire is typically used in the early phases of treatment for aligning and leveling teeth through application of relatively gentle, small forces.
  • the round arch wire 152 may be replaced with a somewhat larger rectangular arch wire.
  • a later treatment phase is shown in Figure 5A.
  • one of the labial web covers e.g., mesial web cover 114a
  • the other cover e.g., distal web cover 114b
  • Treatment with a bracket that includes only one labial web cover, with one cover removed, may be advantageous when attempting to correct a severely rotated tooth, as a twin bracket including unremoved web cover 114b effectively creates a fulcrum about which the tooth may be rotated.
  • each thinned connecting web region is advantageously formed so as to be substantially in a plane defined by the occlusal or gingival sidewall of the arch wire slot so that when the labial web cover is removed, no remaining portion of the labial web cover occludes labial access to the arch wire slot.
  • labial web cover 114b may also be removed, allowing treatment to be completed with larger rectangular arch wire 158. Because machined brackets provide for narrower dimensional tolerances and thus web removal force, intraoral removal of the labial web covers 1 14a and 1 14b is less likely to result in debonding of the bracket from the tooth, as might otherwise occur with metal injection molded convertible brackets where the dimensional tolerances (and thus web removal force) varies within a wider range. As shown in Figure 4, the practitioner may rely on the presence of web covers
  • ligatures 160 for ligating the arch wire 152 within the arch wire slot. As the web covers are removed, ligation of the arch wire 154 may be aided or accomplished by ligatures 160, as seen in Figures 5A-5B.

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)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Abstract

La présente invention concerne des brackets orthodontiques convertibles (100) qui comprennent une base de bracket (102) à l'intérieur de laquelle est formée une fente pour fil d'arc (106), une première paire d'ailes d'attache (108a, 108b) s'éloignant de la fente par les côtés occlusal et gingival, une seconde paire d'ailes d'attache (110a, 110b) s'éloignant de la fente (106) par les côtés occlusal et gingival, une première couverture labiale (114a) formée en une seule pièce avec et s'étendant entre les ailes d'attache de la première paire d'ailes d'attache (108a, 108b), et une seconde couverture labiale distincte (114b) formée en une seule pièce avec et s'étendant entre les ailes d'attache de la seconde paire d'ailes d'attache (110a, 110b). Le bracket (100) peut avantageusement être formé par un processus d'usinage, dans lequel les couvertures (114a, 114b) et les ailes d'attache (110a, 110b et 108a, 108b) sont formées à partir d'une seule pièce en métal, en un seul tenant. La fabrication par usinage permet l'utilisation de métaux plus denses et plus résistants que ceux utilisés lors de la fabrication par moulage par injection de métal.
PCT/US2010/027005 2009-03-13 2010-03-11 Brackets orthodontiques jumeaux convertibles WO2010105069A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15987309P 2009-03-13 2009-03-13
US61/159,873 2009-03-13

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WO2010105069A1 true WO2010105069A1 (fr) 2010-09-16

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WO (1) WO2010105069A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019217993A1 (fr) * 2018-05-14 2019-11-21 Erskine Holdco Pty Ltd Dispositif d'ancrage orthodontique

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US10525320B2 (en) 2016-01-07 2020-01-07 John Bert Thomas Practice device for improving volleyball skills
US20200282289A1 (en) * 2019-03-05 2020-09-10 Hannah Rose Behrmann Volleyball setter training glove

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US20040086825A1 (en) * 2002-11-04 2004-05-06 3M Innovative Properties Company Orthodontic appliance with fatigue-resistant archwire retaining latch
US20060003282A1 (en) * 2004-07-02 2006-01-05 Nicholson James A Shape memory self-ligating orthodontic brackets
US20070264606A1 (en) * 2006-04-26 2007-11-15 Rmo, Inc. Orthodontic bracket with removable slot cover

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USD472364S1 (en) * 2002-03-05 2003-04-01 Brigitte Engelhardt Handwarmer
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4927362A (en) * 1988-07-12 1990-05-22 Unitek Corporation Convertible buccal tube
US20040086825A1 (en) * 2002-11-04 2004-05-06 3M Innovative Properties Company Orthodontic appliance with fatigue-resistant archwire retaining latch
US20060003282A1 (en) * 2004-07-02 2006-01-05 Nicholson James A Shape memory self-ligating orthodontic brackets
US20070264606A1 (en) * 2006-04-26 2007-11-15 Rmo, Inc. Orthodontic bracket with removable slot cover

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019217993A1 (fr) * 2018-05-14 2019-11-21 Erskine Holdco Pty Ltd Dispositif d'ancrage orthodontique

Also Published As

Publication number Publication date
US20100229280A1 (en) 2010-09-16

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