WO1997042906A1 - Bracket orthodontique alignable a ligature automatique - Google Patents

Bracket orthodontique alignable a ligature automatique Download PDF

Info

Publication number
WO1997042906A1
WO1997042906A1 PCT/US1997/007912 US9707912W WO9742906A1 WO 1997042906 A1 WO1997042906 A1 WO 1997042906A1 US 9707912 W US9707912 W US 9707912W WO 9742906 A1 WO9742906 A1 WO 9742906A1
Authority
WO
WIPO (PCT)
Prior art keywords
bracket
bracket assembly
poπion
roof
slide
Prior art date
Application number
PCT/US1997/007912
Other languages
English (en)
Inventor
Saeed Saghafi
William Nichols
Myron Swensen
Original Assignee
'a' Company Orthodontics
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 'a' Company Orthodontics filed Critical 'a' Company Orthodontics
Priority to EP97925510A priority Critical patent/EP0955937A4/fr
Publication of WO1997042906A1 publication Critical patent/WO1997042906A1/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
    • A61C7/28—Securing arch wire to bracket
    • A61C7/287—Sliding locks

Definitions

  • This invention relates to improvements devices used in orthodontic treatment and, more particularly, to alignable, self ligating orthodontic brackets.
  • Brackets are often attached to a patient's teeth in orthodontic treatment. These brackets are engaged by a resilient archwire that exerts forces on them.
  • each bracket is bonded to the patient's teeth, so forces applied to the brackets by the archwire are transferred to the teeth to move them.
  • each bracket includes a slot which receives the archwire.
  • brackets In an attempt to facilitate archwire retention, many brackets include projections. These projections facilitate holding down the archwire within the slot by means of wires (ligatures) or elastomeric O-rings.
  • wires ligatures
  • O-rings elastomeric O-rings.
  • ligatures wires
  • O-rings elastomeric O-rings
  • a self ligating bracket requires a lockable closure for the archwire slot.
  • the closure should ideally leave the top and bottom of the bracket, including the projections conventionally used for anchoring ligatures, free to receive other attachments or auxiliary devices.
  • the Wildman patent in an attempt to address these issues, discloses a slidable closure that engages the front of the archwire. The closure is recessed from the front surfaces of the bracket. Unfortunately this recessed closure requires the archwire to be fully recessed within the slot before the closure can be moved into place over the archwire. Given the small size of orthodontic brackets, this arrangement makes it difficult to confirm visually that the archwire is properly seated within the slot.
  • the sliding closure is desirable because it reduces the time required for opening and closing the archwire slot during periodic adjustment of the archwire and brackets.
  • the bracket is designed to mount an archwire flush with its anterior surface. This facilitates visual positioriing of the archwire during orthodontic treatment.
  • the sliding closure is permanently retained on the bracket during use, whether left open or closed. This guards against accidental release of the closure while the bracket is worn on a tooth.
  • the bracket includes the usual tying extensions and the closure leaves these fully accessible to other orthodontic attachments.
  • the Damon bracket has certain disadvantages: First, the slides of the closure are engaged by guides along the full length and across the full width of each slides. This is disadvantageous as a substantial amount of metal to metal contact exists. This contact increases the friction between the slides and the bracket body and makes the closure difficult to open and shut.
  • bracket is mounted on a square pad for bonding to a tooth.
  • Square pads as described in US 4,415,330 (Daisley, et al.), have the disadvantage that they are difficult to align on the tooth for a self-ligating bracket.
  • Orthodontists wishing to maximize the number of patients whose needs they address, must decrease the length of time any given patient spends in their offices. If a bracket is to address this need, therefore, it must be easy and quick to align on the tooth as well as be configured to quickly receive and retain an archwire.
  • this invention provides for a self-locking orthodontic bracket which includes a base for attachment to a tooth bonding pad and transversely spaced tying lugs that project from the base.
  • the bracket defines an anterior surface interrupted by an archwire slot.
  • a slide mounted on the bracket includes a movable roof that slides over and covers the archwire slot to retain an archwire therein.
  • the slide is supported on the bracket by a pair of runners that slidably engages ledges formed in opposed side surfaces of the bracket.
  • the roof of the slide is connected to the runners by two legs which straddle the main body of the bracket.
  • the legs are bent downwardly inward to bias runners of the slide into contact with ledges and/or the outside surfaces of the bracket.
  • An inner acute angle formed between a runner and corresponding leg is preferably about 83° to 85°.
  • Each ledge also defines an included acute angle, preferably one to four degrees less than the runner-leg angle of the slide, so that when the slide is positioned on the bracket body the metal-to-metal contact between the ledge/outer surface of the bracket and the runners of the slide is minimized.
  • the engaging surfaces of the ledge contacting edge of each runner are preferably chamfered (i.e., rounded) to reduce sharp edge contact between the runner and the bracket body. This reduces sticking and particle generation.
  • a semi-circular cutout can be formed in the engaging surface of each runner. Particles generated between the runners and the bracket body ledges can then fall through the cutout.
  • the bracket is preferably mounted on a generally parallelogram-shaped tooth bonding pad such that its axis pe ⁇ endicular to the archwire slot is at an angle y relative to one of the pairs of the edges of the bonding pad.
  • the angle ⁇ is variable and is typically selected based on the idealized angle ⁇ of the long axis of the tooth to be treated with respect to the occlusal plane of the mouth.
  • the pad may also include score marks and other formations at its upper and lower edges to assist in pad alignment with the tooth axis.
  • FIG. 1 is a partially cut away elevational view of an assembled bracket with the slide in a closed position;
  • FIG. 2 is a cross-sectional perspective view of the body of the bracket of
  • FIG. 1 with the slide removed.
  • FIG. 3 is a side view of the bracket in FIG. 1;
  • FIG. 4 is a side view of the bracket in FIG. 1 with the slide in an open position;
  • FIG. 5 is a top perspective view of the slide for the bracket according to the invention;
  • FIG. 6 is a partially cut-away, top view of the slide of FIG. 5;
  • FIG. 7 is a partially cut-away, elevational view of the slide of FIG. 5;
  • FIG. 8 is a sectional view of the slide taken along line 8-8 in FIG. 6;
  • FIG. 9 is an elevational view of a spring suitable for use with the bracket of the invention;
  • FIG. 10 is a sectional view of a fully assembled bracket taken along line 10-10 in FIG. 1;
  • FIG. 11 is a sectional view similar to FIG. 10 , but showing the slide in an open position
  • FIG. 12 is a sectional view taken along line 12-12 in FIG. 3;
  • FIGS. 13 is a plan view of the bracket (in outline) positioned on a non- square bonding pad according to the invention;
  • FIG. 14 is a perspective view of the bracket mounted on a bonding pad for mounting to an upper tooth.
  • FIG. 15 is a schematic illustration of the use of the bracket and pad combination of the invention during alignment and positioning on a tooth.
  • the front or anterior surfaces of a bracket are those directed outwardly from a supporting tooth. Conversely, the rear or posterior surfaces are those which face toward the tooth. Dimensions along the bracket parallel to the incisal or occlusal line are referred to as its width and as being transverse and dimensions extending pe ⁇ endicularly to the incisal/occlusal line are referred to as the height.
  • the upright surfaces across the width of the bracket are its side surfaces and the surfaces along the top and bottom of the bracket are its incisal, occlusal or the gingival surfaces.
  • the bracket 5 of this invention is generally illustrated in FIG. 1 and its constituent parts are illustrated in detail with reference to FIGS. 1-12.
  • the bracket 5 includes a supporting body or base 10 with a posterior surface 11 for attachment to a pad (not shown in these figures).
  • the pad, in rum, is used to bond the bracket 5 to a tooth.
  • the bracket body 10 can be approximately 0.120 inches wide and 0.140 inches high.
  • the bracket 5 can be 0.100 inches wide with the same height. This narrower bracket 5 allows for a more exposed wire between the brackets 5, a feature that, in turn, allows for more flex in the wire.
  • the bracket 5 is shown as a "Siamese" bracket, having two adjacent pairs of tying lugs or projections 12 each protruding about
  • the bracket 5 also includes outer side surfaces 15 and an anterior surface 17.
  • the anterior surface 17 is interrupted by a generally rectangular, transverse archwire slot 18.
  • the archwire slot 18, which is about 0.028 inches deep, spans the full width of the bracket 5 and is sized to snugly receive an archwire (not shown).
  • the slot 18 will be about 0.018 to 0.022 inches high.
  • the anterior corners of the slot 18 are formed with rounded or chamfered edges 19. These chamfered edges 19 assist in receiving and guiding the archwire into the slot 18.
  • slot 18 is rectangular and is designed to receive a complementary rectangular archwire, it is to be understood that the slot 18 can be configured to receive archwires with round or other cross-sectional shapes.
  • the archwire slot 18 can be covered with a slidable slide 21 which includes a roof portion 24 that spans across and beyond the entire slot 18.
  • the roof portion's 24 dimension taken pe ⁇ endicular to the longitudinal axis of the slot width is about 0.058 inches and thus greater than the corresponding dimension of the archwire slot 18.
  • the slide 21 also includes a pair of runners 22 each engaging the posterior surfaces of a ledge 23 extending along each side 15 of the bracket 5.
  • the ledges 23 preferably extend along the full height of the bracket 5, as can be seen from FIGS. 3 and 4. As can be seen, the runners 22 and the ledges 23 are parallel to the anterior surface 17 of the bracket 5.
  • the supported roof portion 24 slides with its inner surface parallel to and flush against the anterior surface 17 of the bracket 5.
  • the roof portion 24 remains adjacent to the anterior surface 17 of the bracket 5 regardless of whether the slide 21 is in its open or closed positions shown respectively in FIGS. 3 and 4.
  • the open position is with the roof portion 24 clear of the archwire slot 18 and the closed position is with the roof po ⁇ ion 24 overlapping the full width and height of the slot 18.
  • the roof portion 24 together with the slot 18 define a fully enclosed "tube" for retaining an archwire across the bracket 5.
  • the posterior surface 11 of the body 10 of the bracket 5 is generally concave.
  • This concave shape is further defined by a compound curvature comprising, say, a first radius of curvature R, of about 0.750 inches and a second radius of curvature R 2 of about 0.178 inches.
  • R t is the scalar value of the vector R'
  • R 2 is the scalar value of the vector R' 2 .
  • R' translates circumferentially in a plane that is substantially parallel to the longitudinal axis 88 (see Figure 15) of a patient's tooth and R' 2 translates cicumferentially in a plane that is substantially pe ⁇ endicular to the plane swept out by R',.
  • R t and R 2 are very specific to both the tooth curvature and the specific tooth aligning prescription being followed by the orthodontist. Accordingly, the dimensions for R, and R 2 given above must be seen only as exemplary and are provided here primarily as a cross reference to the radii of curvature given in the later description of the tooth bonding pad.
  • each runner 22 is structurally connected to the roof portion 24 by an associated rigid leg 30.
  • Each leg 30 is offset from the center line of the slide 21 so that there is adequate clearance across the full height of the archwire slot 18 when the slide 21 is in its closed position. Thus, transverse sliding movement of the runners 22 and legs 30 does not block or restrict access to any portion of the open transverse archwire slot 18.
  • the posterior surface of the roof portion 24 includes two stamped-in detents 32, the function which will be described in detail below with reference to FIGS. 10 to 12.
  • Each detent 32 is about 0.10 inches deep with one sloping long side 33 parallel to a generally vertical long side 34.
  • Each detent 32 also has a generally flat roof portion parallel to the top of the roof portion 24. Typically, each detent 32 is about 0.072 inches long and 0.020 inches wide where it opens out. As the detents 32 are stamped into the roof portion 24, two associated ridges 32' are defined on the anterior surface of the roof portion 24.
  • the rigid legs 30 and the runners 22 of the slide 21 are arranged in a unique manner.
  • the legs 30 Prior to installing the slide 21 on the bracket 5, the legs 30 are sloped downwardly inward at an angle ⁇ to the vertical.
  • the angle ⁇ may vary from slide 21 to slide 21 and depends on the distance ⁇ between the inner engaging surfaces 25 of the runners 22. Typically the angle ⁇ is about 7°.
  • the legs 30 are forced slightly outward at their free ends so that the angle ⁇ tends to zero. This is illustrated in FIG. 12. This arrangement ensures that the runners 22 are biased inwardly into engagement with the outer sides 15 of the bracket 5.
  • the runners 22 define an included acute angle ⁇ to their respective supporting legs 30.
  • This angle ⁇ is typically in the range of 75° to 89° and preferably about 83° to 85°.
  • This configuration is particularly advantageous because, when the slide 21 is in place on the bracket body 10, the legs 30 are practically parallel with the sides 15 of the bracket 5, and only the inner engaging surfaces 25 of the runners 22 engage the ledge 23. This edge contact is instead of the entire runner surface being engaged as in the prior art. Thus the amount of metal-to-metal contact is reduced and the slide 21 slides relatively easily between the open and closed positions.
  • each ledge 23 slopes inwardly upward to define an included acute angle ⁇ with the side 15 of the bracket 5.
  • This configuration allows the slide 21 to better orient in the sliding direction to minimize twisting or rotating of the runner 22 with respect to the bracket 5.
  • the angle ⁇ is typically greater than the acute angle ⁇ by about 1 to 4 degrees. This ensures that the advantageous edge contact between the runners 22 and the ledge 23/side 15 is maintained.
  • the edges of the engaging surface 25 can be formed as chamfered edges 25'. This prevents a sha ⁇ edge of the engaging surface 25 from engaging the bracket body 10, and reduces unwanted sticking which may result from sha ⁇ edge contact.
  • the chamfered edges 25' also reduce the amount of particles that would be formed from the sha ⁇ edge contact that would otherwise occur.
  • leading ends 22' of runners 22 may be chamfered thus forming a chamfered leading end 22".
  • the chamfered leading ends 22" make it easier for the orthodontist to attach the slide 21 to the bracket body 10. More particularly, runners 22 with chamfered leading ends 22" permit the runners 22 to engage to the ledges 23 more readily than without the chamfers. Similar to the chamfered edges 25', the chamfered leading ends 22" also reduce unwanted sticking and particle lodging between the runners 22 and the ledges 23.
  • FIGS. 5 and 6 Another embodiment of the invention (see FIGS. 5 and 6), utilizes a semi ⁇ circular recess 26 to facilitate removal of particles that can lodge between the runner 22 and the ledge 23. Use of runners 22 having the recess 26 is also optional.
  • the slide 21 is fabricated independently from the bracket 5 and is attached to the bracket 5 prior to installation of the bracket 5 on a tooth. While the slide 21 is normally retained on the bracket 5 during its use, it can be forced free from the bracket 5 for replacement pu ⁇ oses or when use of the slide 21 is not required.
  • the design of the bracket 5 and slide 21 is such that removal of the slide 21 can only be achieved by substantial prying movement, such as might be applied through use of a sealer or by cutting one of the legs 30.
  • the spring 28 is a resilient spring formed from a length of wire and can have various cross-sectional shapes, such as circular, oval, square and rectangular.
  • the spring 28 includes a bent section 35 that normally extends beyond the anterior surface 17 across the bracket 5. This allows the slide 21 to be releasably maintained in an open or a closed position by engagement of the spring 28 within detent 32.
  • the spring 28 can be constructed of any suitable metallic or non-metallic material capable of deformation between a normal extended condition and a compressed condition as the slide 21 moves over it.
  • each detent 32 includes an inclined surface 33 and a generally flat po ⁇ ion parallel to the anterior surface 17 as well as a wall 34.
  • This wall 34 serves as a stop when engaged by the spring 28 and the position of the wall 34 defines the closed and open positions of slide 21, as respectively illustrated in FIGS. 10 and 11.
  • the inclined surface 33 of the detent 32 assists in providing tactile "feel" to the slide movement, thereby guiding the user to the locked open or locked closed position of the slide 21 , i.e., where the spring 28 engages one of the walls 34.
  • the forces exe ⁇ ed on slide 21 by the engaged bent end section 35 also maintain the slide 21 in one or the other of its alternate positions.
  • the above described design of the slide 21 has a number of advantages.
  • the sliding suppo ⁇ provided to the slide 21 in a direction parallel to the anterior surface 17 of the bracket 5 assures that forces applied to the bracket 5 by the archwire will not result in accidental release of the slide 21 from the bracket 5 when installed in the mouth of a patient. Any outwardly directed forces exe ⁇ ed by the archwire on the slide 21 will be resisted by the stiff structure of slide 21, runners 22 and legs 30. These elements, therefore, should be constructed to withstand any foreseeable outward archwire forces without substantial deformation.
  • the spring 28 and the complementary detents 32 must be designed to hold slide 21 in a locked position after installation in the mouth.
  • the preferred transverse orientation of the spring 28 permits it to provide substantial resistance to cover movement during normal usage of the bracket 5 within the mouth of a patient.
  • the slide 21 still remains readily releasable to specifically directed forces applied by professionals during installation and adjustment of the bracket 5 and archwire.
  • bracket 5 and slide 21 combination are mounted on a tooth bonding pad 50.
  • the bonding pad 50 is formed to approximate a parallelogram.
  • three of the pad's 50 edges correspond to two sho ⁇ edges, respectively, the mesial and distal edges 52 of the pad 50, and one long edge (or "occlusal" edge 54) of a parallelogram.
  • the remaining edge, the illustrated gingival edge, is defined by two sloping sides 56 of a relatively flat triangle.
  • the apex 57 of the triangle is slightly rounded. When attached to a tooth, the apex 57 is configured so that it always "points" towards the gingiva.
  • the bracket 5 is mounted onto the pad 50, as shown, with its horizontal centerline coinciding with the pad's 50 horizontal centerline 60, i.e., the centerline parallel to the occlusal edge 54.
  • Figure 14 shows a perspective view of the bracket 5 mounted on the pad 50, the arrangement shown as would be for attaching to an upper tooth of a patient. Because, as described above, the apex 57 always points towards the gingiva when the pad 50 is attached to a tooth, the cavity 31 in the bracket 5 will be nearer the pad occlusal edge 54 than will be the slot 18 when the pad 50/bracket 5 combination is attached to the tooth. By contrast, for a lower tooth attachment (configuration not shown in the figures), the bracket 5 is mounted on the pad 50 such that the cavity 31 is closer to the gingiva than is the slot 18.
  • the bracket 5 is not fully “squared” on the pad 50. Instead it can be arranged so that its outer surfaces 15 define an angle 90°- ⁇ to the pad's 50 central ve ⁇ ical axis which is parallel to its mesial and distal edges 52. Thus, although the geometric centers and the horizontal center lines of both bracket 5 and pad 50 coincide, they are rotated in plane by the angle 90°- ⁇ with respect to each other.
  • the angle ⁇ may vary.
  • the pad 50 is relatively small, typically having a height 62 of about 0.140 inches and a width 64 of about 0.168 inches. It is generally domed shaped with a uniform thickness.
  • the lower, tooth engaging surface is concave with a compound curvature defined by two radii of curvature R P! and R ⁇ .
  • and R n are the scalar values of the vectors R' P1 and respectively.
  • R' P] translates circumferentially in a plane that is substantially parallel to the mesial and distal edges 52 of the pad 50 and R' ⁇ translates circumferentially in a plane that is substantially parallel to the pad occlusal edge 54 of the pad 50.
  • the scalar values R PI and Rp 2 are related to the scalar values Ri and R 2 defining the compound curvature of the posterior surface 11 of the body 10 of the bracket 5 (see FIGS. 11 and 12).
  • the values of R P1 and R ⁇ are each less than the respective values of R, and R 2 by an amount approximately equal to the thickness of the pad 50 (which is typically 0.0120 inches). Therefore, in this non-limiting example, R P1 is about 0.738 inches and R ⁇ is about 0.166 inches. Accordingly, the bracket 5 is able to mate snugly with the upper surface of the pad 50 when the two are secured to each other.
  • R P1 and R n are prescription and tooth dependent and can vary considerably from the dimensions given.
  • the dimensions of the pad can vary and the mesial and distal edges could be longer than the pad occlusal edge 54.
  • the angles between the pad occlusal edge 54 and mesial and distal edges 52, could also be close to, or exactly,
  • the concave shape of the tooth engaging the surface of the pad 50 provides better tooth bonding at the tooth and pad interface. Bonding can be further enhanced by providing the pad 50 with a roughened or mesh-covered bonding surface. In addition, the shape of the pad 50 assists the orthodontic practitioner in aligning the bracket 5 on a tooth. This feature is illustrated with reference to FIG. 15.
  • the goal of orthodontic treatment is to move each tooth in the mouth to a pa ⁇ icular predetermined, idealized position in the arch and to define a predetermined, idealized angle between its long axis and the mouth's occlusal plane.
  • the tooth In reality, the tooth is not in its idealized position and its crown axis is not at its idealized angle to the occlusal plane.
  • the tooth long axis can best be approximated by visualizing the long axis of the crown, the only visual component of the tooth. It is also convenient to define the occlusal edge of an individual tooth and to bear in mind that, in untreated teeth, this edge will typically not coincide with the mouth's occlusal plane.
  • a tooth 80 includes a crown 82 and a root 84 having an apex 86.
  • the tooth 80 is said to have a tooth long axis 88 which extends from the apex 86 to the tip 90 of the crown 82.
  • the long axis 88 of the tooth 80 is shown disposed at an acute angle ⁇ with respect to the occlusal edge 92 of the tooth 80.
  • the figure also shows an occlusal plane 93.
  • the tooth's occlusal edge 92 is both angled to and ve ⁇ ically displaced from the occlusal plane 93.
  • the bracket 5 and pad 50 combination of the invention are schematically shown bonded to the tooth 80 with the pad's 50 axis 70 aligned along the long axis 88 of the tooth 80 and the pad occlusal edge 54 parallel to the tooth's 80 occlusal edge 92.
  • the pa ⁇ icular configuration of the pad 50 facilitates this arrangement.
  • the pad's 50 mesial and distal edges 52 define two parallel lines straddling the tooth long axis 88. Positioning these two edges parallel to the long axis 88 can therefore be accomplished visually.
  • the apex 57 of the pad 50 can be placed on a ridge of the tooth crown. This ridge closely approximates the tooth long axis 88. When the apex 57 is aligned with the crown ridge of the tooth, the pad 50 and the bracket 5 are properly aligned with the tooth long axis. Alignment is further facilitated by visual inspection of the pad occlusal edge 54, which should be aligned parallel to the occlusal edge 92 of the tooth 80.
  • the pad 50 may also contain a score mark 72 on the axis 70 of the pad 50 (see FIG. 15).
  • the pad 50 and the bracket 5 are correctly aligned with the tooth long axis 88 when both the score mark 72 and apex 57 are aligned with the crown ridge of the tooth 80.
  • the score mark 72 can therefore be used to further facilitate alignment.
  • the orthodontic practitioner selects a bracket 5 in which the angle y or its complement corresponds to a specific prescription for the specific tooth.
  • the tooth 80 will not be in its idealized position, placing and aligning this selected bracket 5 on the tooth 80, as described above, will result in the archwire slot 18 being angled with respect to the mouth's occlusal plane 93.
  • a straight (unbent) archwire placed in the slot 18 and in similar slots in other brackets 5 will bear against the side walls of the slot 18 to cause it to tend to move.
  • These forces are transmitted to the tooth 80 via the pad 50 and cause the tooth 80 to move towards its idealized position.
  • the pa ⁇ icular configuration of the bracket 5 described above also makes aligning of brackets 5 on adjacent teeth easier.
  • the orthodontic practitioner may choose to align the pad occlusal edge 54 of adjacent brackets 5 with each other. More usually though, the practitioner will visually align the archwire slots 18 of adjacent brackets 5. In the unusual event that the slide 21 is in its closed position prior to placing the bracket 5 on the tooth
  • the archwire slot 18 will be hidden from view. Under normal circumstances this will make alignment of the archwire slots 18 difficult. This difficulty does not, however, arise with the bracket 5 and slide 21 combinations of the invention.
  • the formation of the detents 32 in the roof po ⁇ ion 24 of the slide 21 leaves bumps or ridges 32' protruding beyond the anterior surface of the roof po ⁇ ion 24.
  • the upper one of the ridges 32' is parallel with, and generally centered over, the longitudinal axis of the slot 18 when the slide 21 is closed.
  • this ridge 32' could be used to assist in the alignment of the bracket 5.
  • the bracket shown includes lugs for tying wires and other attachment devices.
  • the basic features of the invention can be applied to bracket structures having no lugs.
  • the configurations of these extensions, when present, can take any desired conventional or unconventional form.
  • the extensions at the top and bottom of the bracket can be located in different planes.
  • the extensions at the top of the bracket can be located in a plane different from that of the extensions at the bottom of the bracket.
  • the extensions might also have the same or a different configuration at the top of the bracket than at the bottom of the bracket.
  • the illustrated bracket and slide combination can be bonded directly to a pad, as shown, or can be mounted on a tooth band for attachment to a tooth.
  • the present bracket can be made from any suitable material, including metals, plastics and ceramics, as well as a combination of such materials.
  • the bracket and slide have generally been designed to be fabricated of metal, but the choice of materials is not critical to understanding or using this invention. The only limitation with regard to materials is the ability to efficiently fabricate or mold the bracket and slide as a cooperative mechanism to engage an archwire during orthodontic procedures.

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

Un bracket orthodontique (5) alignable à ligature automatique comprend une base (10) destinée à être fixée sur une plaquette (50) de fixation à une dent et des taquets d'attache (12) espacés transversalement et dépassant de la base (10). Le bracket (5) définit une surface antérieure (17) interrompue par une fente (18) d'arc en fil métallique. Une coulisse (21) montée sur le bracket (5) comprend un toit mobile (24), lequel recouvre par glissement la fente (18) de l'arc en fil métallique afin d'y maintenir ledit arc en fil métallique. La coulisse (21) est portée sur le bracket (5) par une paire de pattes (22) venant en contact coulissant avec des rebords (23) formés dans des surfaces latérales opposées (15) du bracket (5). Le toit (24) de la coulisse (21) est relié aux pattes (22) par deux pieds (30) à califourchon sur le corps principal (10) du bracket (5). Les pieds (30) sont courbés vers le bas intérieurement afin d'amener les pattes (22) en contact avec leurs rebords respectifs (23). De préférence, le bord (25') de la surface intérieure (25) de chaque patte (22) est arrondi afin de réduire le contact des arêtes vives entre les pattes (22) et le corps (10) du bracket. On réduit ainsi le blocage et la génération de particules. De plus, les extrémités avant (22') des pattes (22) sont de préférences arrondies (22'') rendant ainsi plus aisé le processus de mise en place des pattes (22) sur les rebords (23). Le bracket (5) est monté sur une plaquette de fixation (50), ladite plaquette de fixation (50) présentant, de préférence, deux bords parallèles et un troisième bord pointu. Les bords parallèles et le bord pointu facilitent l'alignement lorsque la plaquette (50) et le bracket (5) sont fixés à une dent.
PCT/US1997/007912 1996-05-10 1997-05-09 Bracket orthodontique alignable a ligature automatique WO1997042906A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97925510A EP0955937A4 (fr) 1996-05-10 1997-05-09 Bracket orthodontique alignable a ligature automatique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1753596P 1996-05-10 1996-05-10
US60/017,535 1996-05-10

Publications (1)

Publication Number Publication Date
WO1997042906A1 true WO1997042906A1 (fr) 1997-11-20

Family

ID=21783141

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/007912 WO1997042906A1 (fr) 1996-05-10 1997-05-09 Bracket orthodontique alignable a ligature automatique

Country Status (2)

Country Link
EP (1) EP0955937A4 (fr)
WO (1) WO1997042906A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999040871A1 (fr) * 1998-02-17 1999-08-19 Damon Family Limited Partnership Verrou orthodontique a ligature autonome
FR2774892A1 (fr) * 1998-02-17 1999-08-20 Damon Family Lp Ensemble a support orthodontique a ligature automatique
WO2003051223A1 (fr) * 2001-12-14 2003-06-26 3M Innovative Properties Company Appareil d'orthodontie pourvu d'une rainure de retenue linguale
EP1876991A2 (fr) * 2005-04-08 2008-01-16 Lancer Orthodontics Ensemble crochet auto-ligaturant bas profil et procede d'utilisation
WO2010083491A1 (fr) 2009-01-16 2010-07-22 Ormco Corporation Brackets orthodontiques et procédé de correction de dents mal positionnées
WO2010105301A1 (fr) * 2009-03-18 2010-09-23 Goldschmied Proprietary Limited Bracket orthodontique et fil métallique pour arc
US10751150B2 (en) 2005-01-11 2020-08-25 Ormco Corporation Self-ligating orthodontic bracket

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4415330A (en) 1979-05-04 1983-11-15 Sybron Corporation Orthodontic bracket assembly
US4659309A (en) * 1985-04-25 1987-04-21 American Orthodontics Corporation Orthodontic bracket with rhomboidal profile
US4712999A (en) * 1986-09-10 1987-12-15 Farel Rosenberg Convertible, self-ligating, archwire positioning orthodontic bracket
US5022854A (en) 1988-12-16 1991-06-11 Ortho Organizers Orthodontic bracket
US5094614A (en) 1991-03-08 1992-03-10 Wildman Alexander J Miniature self-locking labial bracket
US5466151A (en) 1993-04-08 1995-11-14 Damon Family Limited Partnership Spring-locked orthodontic bracket

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4415330A (en) 1979-05-04 1983-11-15 Sybron Corporation Orthodontic bracket assembly
US4659309A (en) * 1985-04-25 1987-04-21 American Orthodontics Corporation Orthodontic bracket with rhomboidal profile
US4659309B1 (en) * 1985-04-25 1993-05-18 American Orthodontics Corporation Orthodontic bracket with rhomboidal profile
US4712999A (en) * 1986-09-10 1987-12-15 Farel Rosenberg Convertible, self-ligating, archwire positioning orthodontic bracket
US5022854A (en) 1988-12-16 1991-06-11 Ortho Organizers Orthodontic bracket
US5094614A (en) 1991-03-08 1992-03-10 Wildman Alexander J Miniature self-locking labial bracket
US5466151A (en) 1993-04-08 1995-11-14 Damon Family Limited Partnership Spring-locked orthodontic bracket

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0955937A4 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2774892A1 (fr) * 1998-02-17 1999-08-20 Damon Family Lp Ensemble a support orthodontique a ligature automatique
US6071118A (en) * 1998-02-17 2000-06-06 Damon Family Limited Partnership Self-ligating orthodontic bracket
WO1999040871A1 (fr) * 1998-02-17 1999-08-19 Damon Family Limited Partnership Verrou orthodontique a ligature autonome
WO2003051223A1 (fr) * 2001-12-14 2003-06-26 3M Innovative Properties Company Appareil d'orthodontie pourvu d'une rainure de retenue linguale
US6733285B2 (en) 2001-12-14 2004-05-11 3M Innovative Properties Company Orthodontic appliance with lingual retaining groove
US10751150B2 (en) 2005-01-11 2020-08-25 Ormco Corporation Self-ligating orthodontic bracket
US11065088B2 (en) 2005-01-11 2021-07-20 Ormco Corporation Self-ligating orthodontic bracket
EP1876991A4 (fr) * 2005-04-08 2009-06-03 Lancer Orthodontics Ensemble crochet auto-ligaturant bas profil et procede d'utilisation
EP1876991A2 (fr) * 2005-04-08 2008-01-16 Lancer Orthodontics Ensemble crochet auto-ligaturant bas profil et procede d'utilisation
EP2387370A4 (fr) * 2009-01-16 2015-08-26 Ormco Corp Brackets orthodontiques et procédé de correction de dents mal positionnées
US9492247B2 (en) 2009-01-16 2016-11-15 Ormco Corporation Orthodontic bracket and method of correcting malpositioned teeth
WO2010083491A1 (fr) 2009-01-16 2010-07-22 Ormco Corporation Brackets orthodontiques et procédé de correction de dents mal positionnées
WO2010105301A1 (fr) * 2009-03-18 2010-09-23 Goldschmied Proprietary Limited Bracket orthodontique et fil métallique pour arc

Also Published As

Publication number Publication date
EP0955937A1 (fr) 1999-11-17
EP0955937A4 (fr) 2002-10-23

Similar Documents

Publication Publication Date Title
US11166790B2 (en) Orthodontic bracket
EP1836990B1 (fr) Support orthodontique à ligature automatique et à profil bas
US5356288A (en) Dual orthodontic bracket
US20230200948A1 (en) Self-ligating orthodontic bracket
US7621743B2 (en) Orthodontic bracket
US4103423A (en) Orthodontic bracket
US4248588A (en) Orthodontic bracket and arch wire
EP2020949B1 (fr) Bracket orthodontique à couvercle de ligature rotatif
EP2919701B1 (fr) Bracket orthodontique auto-ligaturant
US5322435A (en) Orthodontic bracket
US7780443B2 (en) Self-ligating bracket with rotary cover
US4664626A (en) System for automatically preventing overtipping and/or overuprighting in the begg technique
US4427381A (en) Combination light wire and edgewise appliance
CA1131055A (fr) Appareil d'orthodontie pouvant etre employe avec des fils legers ou des fils rectangulaires
US5044946A (en) Universal orthodontic rotation wedge
JPH0371896B2 (fr)
WO1996000533A1 (fr) Cerclage orthodontique a serrage par ressort
US5540586A (en) Elastomeric orthodontic ligatures
US7001179B2 (en) Orthodontic bracket and clip
EP0955937A1 (fr) Bracket orthodontique alignable a ligature automatique
US5302116A (en) Orthodontic bracket
CA1116895A (fr) Appareil orthodontique
CA1255933A (fr) Bracket orthodontique
EP0750478B1 (fr) Cerclage orthodontique a serrage par ressort

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref country code: US

Ref document number: 1997 970136

Date of ref document: 19971113

Kind code of ref document: A

Format of ref document f/p: F

AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1997925510

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 97540975

Format of ref document f/p: F

WWP Wipo information: published in national office

Ref document number: 1997925510

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1997925510

Country of ref document: EP