JP2011045441A - Orthodontic appliance and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an orthodontic appliance which controls torque by wire in an orthodontic treatment using a bracket and the wire, and a method of manufacturing the same. <P>SOLUTION: The orthodontic appliance 1 of a mouthpiece type is molded to cover a tooth row assumed to move into a desired state and to cover the bracket 3 and the wire 4 attached to the tooth row assumed to move into the desired state, which is mounted on the tooth row with the bracket and the wire attached to the tooth row before moving to the desired state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mouthpiece-type orthodontic appliance used for orthodontic correction and a method for manufacturing the same.

  As a mouthpiece-type orthodontic appliance, invisaline (registered trademark: Align Technology) and a clear aligner are often used.

  In an orthodontic system called Invisaline (registered trademark), as shown in Patent Document 1, from a mouthpiece-type orthodontic appliance corresponding to the first dentition, a mouthpiece-type dentition corresponding to an intermediate dentition From the orthodontic appliance to the mouthpiece-type orthodontic appliance corresponding to the last dentition, assuming the movement of the dentition on the computer, prepare all the orthodontic appliances in advance, As the progress progresses, orthodontic appliances at appropriate stages are attached to the patient's teeth to correct the dentition.

  The clear aligner is a mouthpiece type orthodontic appliance that is transparent and has a thin tooth profile, and is a device that applies the necessary orthodontic force to the teeth and moves the teeth using the elasticity of the material. With Invisaline (registered trademark), a series of orthodontic appliances predicted to be used for treatment are prepared and supplied before treatment starts. However, when using the clear aligner, impressions are usually taken at intervals of once every 3 to 4 weeks, and each time a setup model is prepared in which the dentition is arranged until the next movement is desired. Lamination is performed with a laminate of thermoplastic resin to produce a clear aligner for use in the next treatment, and the treatment proceeds.

  The use of Invisaline (registered trademark) or clear aligner is superior in aesthetics compared to orthodontic treatment using an orthodontic wire.

  There is also a system for correcting the dentition by attaching a bracket and a wire to the lingual side of the tooth. For example, “2D Lining Bracket” shown in Non-Patent Document 1 corrects from the lingual side of a tooth without ligating a bracket and a wire. FIG. 9 is a perspective view showing an example of a bracket 90 used in the “2D Lining Bracket”. In FIG. 9, a wire 92 indicated by an imaginary line is passed through a bracket 90, and a clip 91 is sandwiched by pliers or the like. The wire 92 is, for example, a shape memory alloy such as nickel titanium. As the wire 92, there is a case where the shape memory alloy is not used.

Japanese Patent No. 3620048 JP 2008-131979 A

FORESTADENT, “2D Lining Brackets”, [online], [searched on July 28, 2009], Internet <URL: http: // www. forestadent. com / forestaden-en / Product / products / 2D_Lingual_Brackets. php? navanchor = 1710026>

  However, orthodontic treatment using Invisaline (registered trademark) and clear aligner has the following problems because the orthodontic appliance itself can be detached from the patient's teeth. First, even though the orthodontic appliance is removable, it must be worn for 20-22 hours per day. Therefore, whether or not corrective treatment is successful depends on the cooperation of the patient. Moreover, since it is detachable, the orthodontic appliance is lost or damaged. In addition, indications for orthodontic treatment using Invisaline (registered trademark) and clear aligner are limited. For example, in an orthodontic treatment using Invisaline (registered trademark) and a clear aligner, it is difficult to horizontally move and rotate the teeth, control the tip, move the root of the tooth, and control the occlusion.

  However, the following problems also exist in orthodontics performed by attaching the bracket to the lingual side. FIG. 10 is a view showing a state when the bracket 90 shown in FIG. 9 is attached to the dentition before the orthodontic treatment. FIG. 10 shows a state in which the bracket 90 and the wire 92 are attached to the lingual side from the central incisor to the canine. FIG. 11 is a diagram illustrating a state when the front teeth are aligned. The return force of the wire 92 aligns the front teeth in an arch shape as shown in FIG. However, since the canine is corrected so as to spread laterally, a gap is generated between the canine and the first premolar. FIG. 12 is a view showing a state when the bracket 90 is attached to the first premolars and the wire 92 is attached. As shown in FIG. 11, the bracket 90 is also attached to the first premolar as shown in FIG. 12 in order to draw the anterior tooth that has spread laterally toward the first premolar at the next stage. FIG. 13 is a diagram illustrating a state when the orthodontic treatment is completed. As shown in FIG. 13, the front teeth are drawn toward the first premolars, and the correction of the dentition is completed.

  As shown in FIGS. 11 and 12, when correcting the alignment of the front teeth, the bracket 90 must be attached to the first premolar side at the final stage, and the treatment period becomes longer. Of course, it is also possible to perform orthodontic treatment from the initial stage by attaching the bracket 90 and the wire 92 from the central incisor to the first premolar, but there is a point that it is difficult to predict how the teeth move, In the treatment, as described above, a method of moving from the front tooth and drawing it toward the first premolar side is used. As described above, even when the orthodontic treatment is performed by attaching the bracket and the wire to the lingual side, there is a problem that the treatment period becomes long.

  When using brackets and wires, the torque generated by the wire may not correct the dentition as desired. FIG. 14 is a cross-sectional view for explaining the problem of torque generated by the wire. In FIG. 14, the tooth before correction is shown by 93, and the tooth after correction is shown by 93a. The torque generated by the wire 92 in the bracket 90 and the wire 92 attached to the tooth 93 is indicated by an arrow A. Since torque is generated in the direction of arrow A, the corrected tooth 93a is pulled in the direction of arrow B while rotating obliquely upward. Therefore, in orthodontic treatment, how to control the torque depends on the technology of the dentist. As shown in FIG. 11, the torque due to the wire is one factor in the formation of a dentition in which a gap is generated between the canine and the first molar.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an orthodontic appliance capable of controlling the torque by a wire and a method for manufacturing the same in an orthodontic treatment using a bracket and a wire.

  In Patent Document 2, an orthodontic mouthpiece is manufactured so as to cover a tooth row to which a bracket and a wire are attached in order to apply a vibration force to the tooth row (S2 and FIG. 7 in Patent Document 2). (See S3). However, the orthodontic mouthpiece of Patent Document 2 is not for controlling the torque caused by the wire, and in addition, the tooth made with the bracket and the wire attached to the dentition moved to a desired state. It is not an orthodontic appliance.

  In order to solve the above problems, the present invention has the following features. The present invention relates to a mouthpiece type that is formed so as to cover a dentition assumed to have moved to a desired state and to cover a bracket and a wire attached to the dentition assumed to have moved to a desired state. An orthodontic appliance, wherein the bracket and the wire are attached to the dentition before moving to a desired state. Preferably, the convex part for covering the bracket and the wire is provided on the lingual side. Preferably, the convex portion corresponds to a state in which the bracket and the wire are attached to the dentition from at least a part from the central incisor to the canine. For example, the desired state may be the final dentition state.

  The present invention also relates to a method for manufacturing an orthodontic appliance, the first step of producing a tooth model moved to a desired state, the second step of attaching a bracket and a wire to the tooth model, and a bracket. And a third step of covering the tooth model with the wire attached thereto with a resin material, and a fourth step of removing the cured resin material from the tooth model and producing an orthodontic appliance. Preferably, in the second step, the bracket and the wire are attached to the lingual side. Preferably, in the second step, the bracket and the wire may be attached to the dentition over at least a part from the central incisor to the canine. For example, the desired state may be the final dentition state.

  According to the present invention, the force due to the torque generated by the wire is suppressed by the orthodontic appliance. Therefore, in the orthodontic treatment using the bracket and the wire, an orthodontic appliance capable of controlling the torque by the wire is provided. By controlling the torque, for example, even if the front teeth are moved with a wire, a gap is less likely to be generated between the canines and the first molars. Further, since the basic correction force is realized by the wire, it is possible to perform horizontal movement and rotation movement of the tooth, control of the tip portion, movement of the root portion of the tooth, and occlusion control. Therefore, it can be said that the indications that can be treated with orthodontic appliances are less likely to be restricted than in the case of conventional Invisaline (registered trademark) or clear aligner. Even if the patient's cooperation cannot be obtained, the correction effect can be obtained. Furthermore, since the torque can be controlled, it is not necessary to perform a treatment for returning the tooth movement caused by the torque to a desired state, so that the treatment period can be shortened. Moreover, since the orthodontic appliance can prevent the bracket from hitting the tongue, the discomfort of the orthodontic treatment using the bracket is eliminated. Also, in some cases, there are teeth that can be moved only with orthodontic appliances, so such teeth are corrected only with the orthodontic force of orthodontic appliances, better without mounting brackets and wires.

  By providing the convex part on the lingual side, a highly effective orthodontic treatment is realized while maintaining aesthetics. By making the convex part correspond to the state in which the bracket and the wire are attached to the dentition from at least a part of the central incisor to the canine, spreading of the canine can be effectively prevented.

  If the orthodontic appliance is manufactured with the desired state as the final dentition, the teeth can be moved to the desired final state. In addition, unlike the conventional Invisaline (registered trademark) and clear aligner, it is not necessary to manufacture a plurality of orthodontic appliances, so that the cost required for orthodontic treatment can be reduced. In addition, the number of visits can be expected to be reduced, reducing the burden on the patient. In addition, the orthodontic appliance that has been used after the orthodontic treatment is completed can be used as a retaining instrument (positioner) for preventing the dentition from returning to its original position.

  These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

FIG. 1 is a plan view showing a setup model 2 arranged in a desired dentition. FIG. 2 is a diagram showing a state when a plurality of brackets 3 are attached to the setup model 2. FIG. 3 is a diagram showing a state when the arched wire 4 is attached to the plurality of brackets 3. FIG. 4 is a diagram showing how the orthodontic appliance 1 is manufactured. FIG. 5 is a front view showing the orthodontic appliance 1 produced on the setup model 2. FIG. 6 is a perspective view of the orthodontic appliance 1. FIG. 7 is a diagram for explaining the force generated by the torque generated by the wire 4. FIG. 8 is a cross-sectional view showing a state where the orthodontic appliance 1 is mounted in a state where the bracket 3 and the wire 4 are attached to the teeth. FIG. 9 is a perspective view showing an example of a bracket 90 used in the “2D Lining Bracket”. FIG. 10 is a view showing a state when the bracket 90 shown in FIG. 9 is attached to the dentition before the orthodontic treatment. FIG. 11 is a diagram illustrating a state when the front teeth are aligned. The return force of the wire 92 aligns the front teeth in an arch shape as shown in FIG. FIG. 12 is a view showing a state when the bracket 90 is attached to the first premolars and the wire 92 is attached. FIG. 13 is a diagram illustrating a state when the orthodontic treatment is completed. FIG. 14 is a cross-sectional view for explaining the problem of torque generated by the wire.

  The manufacturing method of the orthodontic appliance 1 which concerns on one Embodiment of this invention is demonstrated using FIGS. FIG. 1 is a plan view showing a setup model 2 arranged in a desired dentition. First, an impression of the tooth profile is taken from the patient, a tooth model is created based on the tooth profile, and a part or all of the tooth model is divided and moved to the desired state, and then moved to the desired state. It was divided dental cast fixed with wax. In this way, the setup model 2 arranged in a desired dentition is completed. The desired state is preferably the final dentition after the orthodontic treatment is completed. In addition, the manufacturing method of the setup model shown here is only an example, and does not limit this invention. For example, the digital data of the tooth profile is processed to create a setup model on the data, the setup model data is reproduced using a reproduction apparatus such as stereolithography, and the reproduced setup model is used in the present invention. May be.

  FIG. 2 is a diagram showing a state when a plurality of brackets 3 are attached to the setup model 2. As the bracket 3, any known bracket can be used. That is, in the present invention, the shape, material, structure and the like of the bracket 3 are not particularly limited. In FIG. 2, the shape of the bracket 3 is assumed to be the same as that of the bracket 90 having the shape shown in FIG. Any known method can be used as a method for attaching the bracket 3 to an appropriate position of the setup model 2. In FIG. 2, the bracket is attached from the central incisor to the canine, but the tooth to which the bracket is attached is not particularly limited. Based on the condition of the patient's teeth, the tooth to which the bracket is attached is appropriately determined by the dentist. In consideration of aesthetics, the bracket is preferably attached to the lingual side, but the bracket may be attached to the lip side.

  FIG. 3 is a diagram showing a state when the arched wire 4 is attached to the plurality of brackets 3. Wire 4, for example, certain metal-made wire or shape memory alloy wire. Since the bracket 3 shown in FIG. 3 is a bracket 90 of the type shown in FIG. 9, the clip portion of the bracket 3 is sandwiched between pliers and the wire 4 is fixed to the bracket 3. When using a type of bracket that ties the wire to the bracket with a wire or the like, the bracket and the wire are attached to the setup model 2 in a state where the wire is ligated to the bracket.

  FIG. 4 is a diagram showing how the orthodontic appliance 1 is manufactured. Laminate plate made of thermoplastic resin (eg Duran from SCHEU-DENTAL, Germany) is heated, the softened laminate plate is brought into contact with setup model 2, and the inside of the chamber is sucked (or pressurized) to laminate plate It is allowed to contact the set-up model 2. The material of the laminate plate is, for example, polyethylene terephthalate. When the thermoplastic resin is cured, the orthodontic appliance 1 is molded on the setup model 2 as shown in FIG. In addition, the excess resin part in the orthodontic appliance 1 is cut. For example, a biostar manufactured by SCHEU-DENTAL in Germany can be used as a heating and pressure welding device for heating and suctioning or pressurizing in the chamber. Any known method can be used as a method of covering the setup model 2 with the resin material, and is not limited to the example shown above.

  FIG. 5 is a front view showing the orthodontic appliance 1 produced on the setup model 2. Preferably, as shown in FIG. 5, the orthodontic appliance 1 may be molded not only to the tooth portion but also to the gum portion. However, depending on the case, the orthodontic appliance 1 may be formed only on the tooth portion.

  FIG. 6 is a perspective view of the orthodontic appliance 1. As shown in FIG. 6, the orthodontic appliance 1 is a negative type that covers the tooth mold when it is assumed that the orthodontic appliance 1 has moved to a desired state. Furthermore, the orthodontic appliance 1 has convex portions 3a and 4a covering the bracket 3 and the wire 4 attached to the dental row assumed to have moved to a desired state on the lingual side.

  In order to prevent the bracket 3 and / or the wire 4 from interfering when the orthodontic appliance 1 is removed, wax or the like is placed on the jaw side or the periphery of the bracket 3 and / or the wire 4 and the teeth. The convex portions 3a and / or 4a of the column correcting device 1 may be formed slightly larger.

  Next, a method using the orthodontic appliance 1. Although the usage method of the orthodontic appliance 1 varies depending on the case, a typical usage method will be described here.

(How to use 1)
From the initial stage to the final stage of orthodontic treatment, the orthodontic appliance 1 is mounted at a stage before the dentition moves to a desired state while being attached to the dentition with the bracket and the wire. In this case, in a state before the orthodontic treatment is completed, a gap is generated between the dentition and the orthodontic appliance 1, and the orthodontic appliance 1 is not attached in close contact with the dentition. . However, basically, the correction force by the wire works as the main correction force, and the correction treatment proceeds.

  Preferably, it is better to wear the orthodontic appliance 1 for as long as possible, but since the orthodontic treatment proceeds with the correction force by the wire, there is no patient cooperation unlike the conventional clear aligner also, the movement of the teeth proceed.

  When the patient appropriately attaches the orthodontic appliance 1 according to the instruction of the dentist, the tooth can be prevented from moving in an undesired direction by the torque by the wire. FIG. 7 is a diagram for explaining the force generated by the torque generated by the wire 4. Tooth shown in FIG. 7 is a maxillary teeth. Torque is generated in the upward direction by the return force of the wire 4 as indicated by an arrow C in FIG.

  FIG. 8 is a cross-sectional view showing a state where the orthodontic appliance 1 is mounted in a state where the bracket 3 and the wire 4 are attached to the teeth. In FIG. 8, the tooth before correction is indicated by 10, and the tooth after correction is indicated by 10a. The torque generated by the wire 4 is indicated by an arrow C in FIG. In FIG. 8, the torque works upward, but the teeth are covered by the orthodontic appliance 1 molded into a desired state after the correction, so that the force generated by the torque of the wire 4 is due to the orthodontic appliance 1. by the reaction force, it is almost canceled. Therefore, it is possible to suppress the force generated by the torque of the wire 4 from acting on the correction of the dentition. Therefore, it is corrected so that the dentition is arranged in a desired state. Therefore, as shown in FIG. 8, the tooth 10 a moves so as to fit properly in the orthodontic appliance 1 molded in a desired state. Thus, orthodontic treatment with controllable torque is realized.

  For example, in the case shown in FIG. 10, the bracket 3 and the wire 4 are attached to the dentition, and the orthodontic appliance 1 is attached to proceed with the treatment. Then, as shown in FIG. 11, the teeth are arranged as shown in FIG. 13 without spreading the canine and without the bracket adhesion to the first premolar. That is, when the orthodontic appliance 1 is used together with the bracket 3 and the wire 4, orthodontic treatment is realized without going through the steps of FIGS. 11 and 12.

(How to use 2)
If the orthodontic appliance 1 can be mounted from the initial stage as in the method of use 1, the orthodontic treatment shown in that 1 can also be realized. Insertion may not be possible. Therefore, in the initial stage, treatment with the bracket 3 and the wire 4 is performed, and the orthodontic appliance 1 may be mounted and used when the dentition has moved to such an extent that the orthodontic appliance 1 can be mounted. .

(Usage method 3)
There is also a method of using the orthodontic appliance 1 only at night. The orthodontic appliance 1 will be worn for about 7 to 8 hours during sleep. Even with such attachment, it is possible to prevent undesired spreading of the canine.

(Usage method 4)
In the initial stage, after moving to some extent using a conventional clear liner, the bracket 3 and the wire 4 are attached, and the orthodontic appliance 1 is attached together. Torque works to prevent the teeth from moving in an undesirable direction.

  In addition, after orthodontic treatment is completed, the orthodontic appliance 1 that has been used can be used as a retaining device (positioner) for preventing the dentition from returning to its original state.

  Thus, according to this embodiment, the orthodontic appliance 1 that can control the torque by the wire 4 is provided in the orthodontic treatment using the bracket 3 and the wire 4. By controlling the torque, for example, even if the front tooth is moved by the wire 4, a gap is hardly generated between the canine and the first molar.

  Further, since the basic correction force is realized by the wire 4, it is possible to perform horizontal movement and rotation movement of the tooth, control of the tip portion, movement of the root portion of the tooth, and occlusion control. Therefore, it can be said that the treatable indication when the orthodontic appliance 1 is used is less likely to be restricted than in the case of Invisaline (registered trademark) or clear aligner.

  Even if the patient's cooperation cannot be obtained, the correction effect can be obtained.

  Furthermore, since the torque can be controlled, it is not necessary to perform a treatment for returning the tooth movement caused by the torque to a desired state, so that the treatment period can be shortened.

  Further, since the orthodontic appliance 1 can prevent the bracket from hitting the tongue, the discomfort of the orthodontic treatment using the bracket is eliminated.

  In some cases, there may be a tooth that can be moved only by the orthodontic appliance 1. Therefore, such a tooth is corrected only by the orthodontic force of the orthodontic appliance 1, and such a tooth is used. better without mounting brackets and wires to.

  Although the present invention has been described in detail above, the above description is merely illustrative of the present invention in all respects and is not intended to limit the scope thereof. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention.

  The present invention relates to an orthodontic appliance and a method for manufacturing the same, and can be used industrially.

DESCRIPTION OF SYMBOLS 1 Orthodontic appliance 2 Setup model 3 Bracket 3a, 4a Convex part 4 Wire 10 Teeth before correction 10a Teeth after correction

Claims (8)

  A mouthpiece type orthodontic that covers the dentition assumed to have moved to a desired state and is formed so as to cover the bracket and the wire attached to the dentition assumed to have moved to the desired state. An orthodontic appliance, wherein the orthodontic appliance is mounted on the dentition with the bracket and the wire attached to the dentition before moving to the desired state.   The orthodontic appliance according to claim 1, wherein a convex portion for covering the bracket and the wire is provided on the lingual side.   The orthodontic appliance according to claim 2, wherein the convex portion corresponds to a state in which the bracket and the wire are attached to the dentition from at least a part from a central incisor to a canine. Instruments.   The orthodontic appliance according to claim 1, wherein the desired state is a final dentition state. A first step of producing a tooth model moved to a desired state;
A second step of attaching a bracket and a wire to the tooth model;
A third step of covering the tooth model to which the bracket and the wire are attached with a resin material;
And a fourth step of producing an orthodontic appliance by removing the resin material cured from the dental cast, method of manufacturing the orthodontic appliance.   6. The method of manufacturing an orthodontic appliance according to claim 5, wherein, in the second step, the bracket and the wire are attached to the lingual side.   The method of manufacturing an orthodontic appliance according to claim 6, wherein in the second step, the bracket and the wire are attached to the dentition over at least a part from a central incisor to a canine.   The method of manufacturing an orthodontic appliance according to any one of claims 5 to 7, wherein the desired state is a final dentition state.

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