UNIMPEDED DISTALIZING JIG

Abstract

An unimpeded distalizing jig, comprising a pair of tooth bond pads, an intra dental arch telescoping assembly, comprising a rod-like insertion and a tubular shell, which constrains the rod-like insertion to move with respect to the tubular shell along an elongated axis, which may be a radial path; and a force generating structure configured to supply an off-axis distalizing force to the intra dental arch telescoping assembly, such that the distalizing force is provided to the posterior tooth substantially without applying an anteriorizing force on the anterior tooth. The force generating structure may be an elastic band fixed by a hook to the tubular shell on one side, and to a molar on an opposing dental arch on the other side.

Claims

1. An unimpeded distalizing jig, comprising: a rod having a first tooth fixation mechanism; a tube having a second tooth fixation mechanism and a hook element configured to receive a force from an elastic; and the tube being sealed around the rod to form a displaceable telescoping mechanism with the rod constrained to move within the tube.

2. The unimpeded distalizing jig according to claim 1, wherein at least one of the first and second tooth fixation mechanisms comprises a universal joint.

3. The unimpeded distalizing jig according to claim 1, wherein the first tooth fixation mechanism comprises a rigid fixation and the second tooth fixation mechanism comprises a universal joint.

4. The unimpeded distalizing jig according to claim 1, wherein the tube is adapted to be connected to a distal tooth through the second tooth fixation mechanisms and the rod is adapted to be connected to the anterior tooth through the first tooth fixation mechanisms.

5. The unimpeded distalizing jig according to claim 1, further comprising the elastic loop.

6. The unimpeded distalizing jig according to claim 1, further comprising an elastic band retaining attachment pad configured for bonding to a molar.

7. The unimpeded distalizing jig according to claim 1, wherein the telescoping mechanism is curved.

8. The unimpeded distalizing jig according to claim 1, further comprising an O-ring at an open end of the tube, configured to seal the tube around the rod.

9. The unimpeded distalizing jig according to claim 1, wherein the tube has a weep hole.

10. The unimpeded distalizing jig according to claim 1, further comprising an O-ring at an open end of the tube, configured to seal the tube around the rod.

11. A method for unimpeded distalization, comprising: affixing a pair of tooth fixation mechanisms comprising a first tooth fixation mechanism attached to an anterior tooth and a second tooth fixation mechanism attached to a posterior tooth on the same dental arch; connecting the pair of tooth fixation mechanisms with an intra dental arch telescoping assembly, comprising a rod displaceable in a tube, the tube being sealed around the rod to form a telescoping mechanism, and a hook element configured to receive a force from an elastic; and generating a distalizing force on the hook element to displace the posterior tooth through the second tooth fixation mechanism, substantially without applying an anteriorizing force on the anterior tooth through the first tooth fixation mechanism.

12. The method according to claim 11, wherein the second tooth fixation mechanism comprises a universal joint affixed to a posterior tooth.

13. The method according to claim 12, wherein the first tooth fixation mechanism comprises a rigid fixation affixed to an anterior tooth.

14. The method according to claim 11, wherein the hook element receives a force from an elastic loop attached to an opposite dental arch, to provide an intra dental arch distalization force.

15. The method according to claim 11, wherein the intra dental arch telescoping structure is curved, to provide a radial movement of the rod in the tube.

16. The method according to claim 11, further comprising an O-ring at an open end of the tube, configured to seal the tube around the rod.

17. The method according to claim 11, wherein the tube comprises a weep hole.

18. An orthodontic distalizing appliance, comprising: a rod having an adhesive tooth fixation pad; a tube, having a universal joint linkage to an adhesive tooth fixation pad; the rod being sealed ay an opening of the tube and being operable to form a displaceable telescoping assembly; and a hook, affixed to the tube, configured to supply a distalizing force from an elastic band to separate the adhesive tooth fixation pad of the rod and the adhesive tooth fixation pad of the tube.

19. The orthodontic distalizing appliance according to claim 18, wherein the tube is curved, and adapted to be connected to the posterior tooth, and the rod is curved and is adapted to be connected to the anterior tooth.

20. The orthodontic distalizing appliance according to claim 19, further comprising an elastic band attachment adapted for mounting on an opposed dental arch with respect to the anterior tooth and the posterior tooth.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIGS. 1-2 show views of a prior art distalizer according to U.S. Pat. No. 7,985,070;

[0037] FIGS. 3-5 show views of a prior art distalizer according to U.S. Pat. No. 6,976,839;

[0038] FIG. 6 shows an exploded view of an orthodontic device and method for treating malocculsions;

[0039] FIG. 7 shows a schematic side view of an embodiment of the present invention FIG. 8 shows a side view of an assembly according to the present invention;

[0040] FIG. 9 shows a top view of a tooth bonding pad with a universal joint according to the present invention;

[0041] FIG. 10 shows a side view of a tubular component according to the present invention;

[0042] FIG. 11 shows a side exploded view of a tubular component, O-ring, rod with tooth bonding pad, and tooth bonding pad with a universal joint according to the present invention;

[0043] FIGS. 12-14 show side assembled views of a tubular component, rod with tooth bonding pad, and tooth bonding pad with a universal joint according to the present invention, in various states of telescoping action; and

[0044] FIGS. 15-17 show photos of the distalizing jig according to the present invention with elastic installed and uninstalled, wherein FIGS. 15 and 16 represent the tooth positioning prior to distalization, and FIG. 17 represents the tooth positioning after the desired distalization.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0045] The unimpeded distalizing jig according to the present invention, as depicted in FIG. 7, has three components.

[0046] FIG. 7 shows an embodiment of the invention in a use configuration. The first component, also as shown in FIG. 9 is a bondable pad 6 that is attached to, e.g., the labial surface of the first permanent molar 1. The bondable pad 6 has a recess to receive an end 7 of the second component, which is a cylindrical-tube 8 also shown in FIG. 10, that can rotate within the bondable pad 6, akin to a ball-in-socket joint. The cylindrical-tube 8 allows for the introduction of the third component, which is a rod-like structure 11, also shown in FIGS. 11-14, which has on its end opposite the ball 7 another bondable pad 9 that can be bonded or secured to the anterior stabilizing unit 2. An elastic band 14 retaining attachment pad 5 is bonded to a tooth, e.g., a molar on the other dental arch. An anchor unit 4 is established by providing a mechanical construct, such as a custom-fitted clear plastic sleeve that collectively unites all of the opposing dentition as a singular entity, e.g., similar to an Essix® (Colgate) retainer unit.

[0047] After installation, the unimpeded distalizing jig appears as shown in FIG. 15. An elastic band 14 fixation is attached to the bondable pad provided on a tooth on the opposing dental arch, to supply the distalization force, as shown in FIGS. 7 and 16. This is a standard elastic fixation type.

[0048] The practitioner performing the installation can cut this rod to size, as predicated by the existing distance between the involved molar benefactor and its associated anterior, stabilizing unit 2.

[0049] The cylindrical-tube 8 may have a Teflon O-ring 12, as shown in FIG. 11, incorporated on its open end 13, which has an internal diameter that will match the diameter of the rod-like structure 11 insert associated with the anterior bondable pad 9. The purpose of the O-ring 12 is to establish an integrated seal between the interactive components, thus allowing for telescopic extension without adding appreciable resistance to the orthodontic force delivery system. Along with the incorporation of this O-ring 12, it may be necessary to include a weep hole distal to the opened end of the cylindrical-tube 8 (not shown) to allow for the escape of fluids and saliva that inadvertently find entry into the cylindrical-tube 8. In general, the rod-like structure 11 in the cylindrical-tube 8 (cylinder) acts as a constraint that permits radial forces with respect to the ball like end 7-in-socket-like portion of the bondable pad 6 fixture, thus prohibiting the introduction of a misaligned force, such that a dental elastic band 14 attached between the hook 10 on the cylindrical-tube 8 and the elastic band 14 retaining attachment pad 5 on the other dental arch, effectively applies this force without inducing a significant off-axis component. For example, if the mean angle between the elastic band 14 retaining attachment pad 5 and the hook 10 is 15 degrees, the components of the force in the vertical axis is ˜26%, and along the horizontal axis is 97%. Thus, the cylindrical-tube 8 allows the hook 10 to be displaced anteriorly with respect to the bondable pad 6, to achieve a small angle. Meanwhile, the bondable pad 9 does not see the horizontal force at all, due to the telescoping members, and sees only a portion of the vertical force. For example, if the horizontal distance between the elastic band 14 retaining attachment pad 5 and the hook 10 is 80% of the distance to the bondable pad 9, then the vertical force will by only about 20% of the elastic force.

[0050] The O-ring 12 also avoids lodging of food in the cylinder, which can lead to loss of radial freedom of movement and bacterial overgrowth.

[0051] In general, the cylindrical-tube 8 need not be linear (e.g., consistent with FIG. 10), and rather may be curved along its axis as shown particularly in FIGS. 11-14 and 17, to accommodate the curved layout of the teeth in the mouth, and the intended force vector on the molar benefactor. Advantageously, the cylindrical-tube 8 is toroidal, and the rod-like structure 11 has a corresponding radius of curvature. The axis of the force will then be aligned with the tangent of the curve of the rod-like structure 11 at the point of contact with the O-ring 12. The circular curvature will tend to avoid binding as might be observed with non-circular profiles, though the constraint is actually that, over the expected range of movement, that the rod-like structure 11 not bind within the cylindrical-tube 8 sleeve, For example, if the cylindrical-tube 8 has a sidewall cutout, the rod-like structure 11 could extend through the cutout to avoid binding, and this need not in that case have the same radius of curvature. However, a sidewall cutout would reduce strength, permit intrusion of food, and is unnecessary.

[0052] A small hook 10 extends inferiorly from the anterior open-end of the cylindrical-tube 8 when the apparatus is installed on the maxillary arch (as shown in FIGS. 15-16), and superiorly when the apparatus is installed on the mandibular arch (not shown). When the elastic band 14 is engaged from the aforementioned hook 10 to the hook on the elastic band 14 retaining attachment pad 5 on the opposing dental arch serving as the anchor unit, as shown in FIGS. 7 and 15, the forces will be directed primarily to the molar 1 benefactor to promote both its intended distal rotation and translation according to the axis of the cylindrical-tube 8. The cylindrical-tube 8 is designed to move away, or in distal direction (see arrow 3 in FIG. 6), from the anterior stabilizing unit 2 in a telescoping motion, thereby reducing the resistance that the anterior stabilizing unit 2 would adversely add to the desired distalization of the molar 1 benefactor.

[0053] It is noted that the tube and rod may be reversed from the preferred layout, with a rod fixed posteriorly and a tube fixed anteriorly. However, this arrangement requires that the elastic band hook be attached to the rod.

[0054] Of course, alternate elastic or spring tension may be applied, instead of the standard elastic bands, however, due to their availability, convenience, low cost, simplicity, non-toxicity, and functionality, elastic bands are preferred. Tensile forces may alternately be applied by steel or memory metal (typically nickel-titanium alloys), pneumatic or hydraulic actuators, magnetic (e.g., permanent magnet) or electromagnetic motors or actuators, without particularly altering the three basic components of the invention, other than their linkage to the force applying element.

[0055] It is important to define resistance as the cumulative imposition of movement of a dental unit or units in response to the introduction of an applied force. In the Carriere Motion 3D prior art shown in FIGS. 3-5, both the molar benefactor and the anterior stabilizing dental-unit collectively generate this resistance, as a singular fixed extension arm physically unites them. Therefore, to provide the desired distalizational response to the molar benefactor would require the effective mitigation of the unintended or impeding distalization of the anterior stabilizing dental-unit. In summary, this would generate greater resistance or impedance, thus challenging the optimal physical mechanics and realization of the orthodontic objective.

[0056] The unimpeded distalizing jig according to the present invention provides the following advantages not currently available in the prior art:

[0057] Flexibility in customizable sizing features, thus reducing the operating costs to maintain adequate inventory; and,

[0058] The unrestrained, independent cylindrical-tube contrivance is without any appreciable resistance or impedance from the anterior stabilizing component, thus allowing for more effective distalization of the molar benefactor.

[0059] While the unimpeded distalizing jig may share a visual resemblance to the Carriere Motion 3D prior art shown in FIGS. 3-5, it offers key advantageous physical and mechanical properties that distinguishes it as uniquely suited to perfect the desired orthodontic objective and response.

[0060] Various alternatives, modifications, and equivalents may be used in lieu of the above components. Further, while the invention has been shown and described with reference to an embodiment thereof, those skilled in the art will understand that the above and other changes in form and detail may be made without departing from the spirit and scope of the following claims.