JP2010274110A - Orthodontic bracket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an orthodontic bracket capable of selecting the load direction of an arch wire matched with the direction to which a tooth to be corrected is desired to be moved and efficiently applying the load of the arch wire to the tooth to be corrected. <P>SOLUTION: The orthodontic bracket 100 includes a base portion 110 and a front plate portion 120 provided by being connected to the base portion 110 so as to face the base portion 110, further has first and second slots 140 and 150 formed in a groove shape between the base portion 110 and the front plate portion 120 in order to hold the wire, and is formed such that an angle formed by the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 and an angle formed by the bottom surface 150a of the second slot 150 and the back surface of the base portion 110 are different from each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an orthodontic bracket for holding a wire such as an archwire.

  An orthodontic correction method is known in which an orthodontic bracket or tube is fixed to a tooth and the elasticity of a wire or the like is used. Orthodontic brackets are used fixed to the patient's teeth to apply the load caused by bending or pulling the archwire to the teeth to be corrected.

  In a conventional orthodontic bracket, a slot (groove) is formed in the central portion on the front side of the bracket body. In addition, an arch wire is fitted into the slot, and the arch wire is attached to a pair of wings formed on the bracket body. During orthodontic treatment, the bracket body was first fixed to the tooth surface with an adhesive, and after the archwire was fitted into the slot of each bracket body, the archwire was attached to a pair of wings. Thereby, the load of the arch wire was added to the tooth to correct (for example, patent document 1).

JP-A-6-233781

  However, in the orthodontic bracket described in Patent Document 1, the slot is formed in the center of the bracket body in a groove shape perpendicular to the bonding surface between the bracket body and the teeth. For this reason, the archwire load was always applied in a direction perpendicular to the tooth surface. Therefore, for example, when trying to correct a vertically shifted tooth, there is a problem that the load of the archwire cannot be efficiently applied in the vertical direction in which the tooth is to be moved.

  The present invention provides an orthodontic bracket capable of selecting an archwire load direction in accordance with a direction in which a tooth to be corrected is desired to move and efficiently applying the archwire load to the tooth to be corrected. For the purpose.

  The orthodontic bracket 100 according to the present invention includes a base portion 110 and a front plate portion 120 that is connected to the base portion 110 so as to face the base portion 110. The orthodontic bracket 100 holds a wire between the base portion 110 and the front plate portion 120. The orthodontic bracket 100 has first and second slots 140 and 150 formed in a groove shape between the base portion 110 and the front plate portion 120 in order to hold the wire. The first and second slots 140 and 150 have planar bottom surfaces 140a and 150a on the base part 110 side. The orthodontic bracket 100 is formed such that the angle formed by the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 is different from the angle formed by the bottom surface 150a of the second slot 150 and the back surface of the base portion 110. Has been.

  In this configuration, the direction of the load applied to the tooth surface when the wire 200 is held in the slots 140 and 150 is changed (determined) by changing (setting) the orientation of the bottom surfaces 140a and 150a of the slots 140 and 150. can do. In the present invention, the angle formed between the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 is different from the angle formed between the bottom surface 150a of the second slot 150 and the back surface of the base portion 110. Therefore, one slot can be selected from the two slots according to the load direction to be applied to the tooth to be corrected. As a result, the load direction of the wire is selected in accordance with the direction in which the tooth to be corrected is desired to move, and the load of the wire can be efficiently applied to the tooth to be corrected.

  In the orthodontic bracket 100 according to the present invention, of the angle formed between the bottom surface 140a of the first slot 140 and the back surface of the base portion 110, and the angle formed between the bottom surface 150a of the second slot 150 and the back surface of the base portion 110. One is 0 degrees. That is, the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 are parallel, or the bottom surface 150a of the second slot 150 is parallel to the back surface of the base portion 110. As a result, the load of the wire can be applied in a direction substantially perpendicular to the surface of the tooth to be corrected in either the first slot 140 or the second slot 150.

  In the orthodontic bracket 100 according to the present invention, the direction in which the first slot 140 extends and the direction in which the second slot 150 extends are substantially parallel to each other. Thereby, the load direction of the wire can be easily switched by switching the arrangement of the first slot 140 and the second slot 150 with respect to the tooth to be corrected. In this way, an orthodontic bracket that can be used in reverse can be provided.

  In the orthodontic bracket 100 according to the present invention, the first and second slots 140 and 150 are formed in accordance with the wire cross-sectional shape. As a result, the wire can be reliably held in the first or second slot 140, 150.

  In the orthodontic bracket 100 according to the present invention, the first and second slots 140 and 150 are provided to face the front plate portion 120. Further, the front plate portion 120 is formed so that the region in which the first and second slots 140 and 150 are formed is included inside the region where the front plate portion 120 is projected to the base portion 110 side.

  Thereby, when trying to see each slot 140 and 150 from the front board part 120 side, each slot 140 and 150 becomes a shadow of the front board part 120, and each slot 140 and 150 cannot be seen. For this reason, when the wire 200 is held in the first or second slot 140, 150, the wire 200 is shielded by the front plate portion 120, and the wire 200 cannot be seen from the front plate portion 120 side. As a result, it is possible to prevent the wire 200 from being seen by others and to improve aesthetics.

  In the orthodontic bracket 100 according to the present invention, a concave groove 113 is formed on the back surface of the base portion 110. Thereby, when the back surface of the base part 110 is attached to the surface of the tooth to be corrected with an adhesive, the adhesive can be held between the back surface of the base part 110 and the surface of the tooth. As a result, the orthodontic bracket 100 can be reliably attached to the tooth surface.

  In the orthodontic bracket 100 according to the present invention, a concave curved surface 111 is formed at the center of the back surface of the base portion 110 along the direction in which the first and second slots 140 and 150 extend. The archwire is held in this concave portion. The extending directions of the first and second slots 140 and 150 are preferably parallel. Since the extending directions of the first and second slots 140 and 150 are parallel, the first or second slot 140 and 150 can be switched and used by rotating the orthodontic bracket 100 by 180 degrees. . Further, flat surfaces 112 are formed at both end portions sandwiching the central portion of the back surface of the base portion 110. Thereby, when the surface of the tooth is flat like the central incisor or the side incisor, the flat surface 112 formed on the back surface of the base portion 110 can be brought into close contact with the tooth surface. On the other hand, when the tooth surface is a curved surface, such as a canine, a premolar, or a molar, the curved surface 111 formed on the back surface of the base portion 110 can be brought into close contact with the tooth surface. Thus, the orthodontic bracket 100 can be reliably attached to the surfaces of various teeth from the incisor to the molar.

  In addition, this invention is not limited to each above-mentioned structure. That is, as described in the following embodiment, the constituent elements included in each of the above configurations can be combined beyond the configuration to which each belongs.

  The present invention can provide an orthodontic bracket that can select the load direction of the wire in accordance with the direction in which the tooth to be corrected is desired to move and efficiently apply the load of the wire to the tooth to be corrected.

  Hereinafter, an example of the configuration of the orthodontic bracket according to the embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a configuration of an orthodontic bracket of the present invention. FIG. 1A is a perspective view seen from the upper surface side, and FIG. 1B is a perspective view seen from the back surface side. FIG. 2 is a diagram showing a configuration of the orthodontic bracket of the present invention. 2 (a) is a plan view showing the configuration, FIG. 2 (a) is a view as seen from an arrow A in FIG. 1 (a), and FIG. 2 (b) is a view as seen from an arrow B in FIG. 1 (a). is there.

  As shown in FIGS. 1 and 2, the orthodontic bracket 100 of the present invention includes a base portion 110, a front plate portion 120, a support portion 130, a first slot 140, and a second slot 150. And a vertical hole 160. An example of the size of the orthodontic bracket 100 is 3 mm or less in height and width and 3 mm or less in height. Here, the horizontal dimension of the orthodontic bracket 100 is the horizontal dimension on the paper surface of FIG. The vertical dimension of the orthodontic bracket 100 is the size in the left-right direction on the paper surface of FIG. It can be said that the vertical dimension of the orthodontic bracket 100 is the longitudinal size of the slot in the orthodontic bracket. The height dimension of the orthodontic bracket 100 is the vertical size on the paper surface of FIGS. 2 (a) and 2 (b). It can be said that the height dimension of the orthodontic bracket 100 is a distance from the bottom surface of the base portion 110 to the upper surface of the front plate portion 120. In this example, a first slot 140 and a second slot 150 are formed on both sides of the column 130. That is, in this example, the base part 110 is connected to the front plate part 120 via the support part 130. The width of the support portion 130 is narrower than the width of the base portion and the width of the front plate portion, whereby the first slot 140 and the second slot 150 are formed on both sides of the support portion 130. .

  As a material of the orthodontic bracket 100, for example, ceramic (preferably containing zirconia particles), plastic resin (for example, polycarbonate), stainless steel (for example, SUS304L), or the like is used. The orthodontic bracket 100 is used by being attached to the tooth surface with an adhesive.

  The base part 110 has a substantially rectangular back surface and is located at the bottom of the orthodontic bracket 100. An example of the size of the base part 110 is 3 mm or less in both length and width and a height of 1 mm or less. The back surface of the base part 110 is attached to the surface of the tooth to be corrected via an adhesive. Thereby, the orthodontic bracket 100 is fixed to the tooth to be corrected. In addition, although the back surface of the base part 110 demonstrated using what is a rectangular shape, it is not limited to this.

  As shown in FIGS. 1B and 2B, it is preferable that a concave curved surface 111 and two flat surfaces 112 are formed on the back surface of the base portion 110. The concave curved surface 111 is formed at the center of the back surface of the base portion 110. The curved surface 111 is formed along the direction in which the first and second slots 140 and 150 extend in a groove shape. The curvature of the curved surface is set to, for example, several mm to several tens of mm. On the other hand, the two flat surfaces 112 are formed at both ends of the back surface of the base portion 110 so as to sandwich the concave curved surface 111.

  Accordingly, when the orthodontic bracket 100 is attached to a tooth having a flat tooth surface, the flat surface 112 formed on the back surface of the base portion 110 can be brought into close contact with the tooth surface. The central incisor and the side incisor can be cited as teeth having a flat tooth surface. On the other hand, when the orthodontic bracket 100 is attached to a tooth having a curved tooth surface, the curved surface 111 formed on the back surface of the base portion 110 can be brought into close contact with the tooth surface. Canines, premolars, and molars are examples of teeth whose surfaces are curved. Thus, since the concave curved surface 111 and the two flat surfaces 112 are formed on the back surface of the base portion 110, the orthodontic bracket 100 is securely attached to the surfaces of various teeth from the incisor to the molar. Can be attached.

  The front plate portion 120 is formed of a substantially rectangular plate member. The front plate portion faces the base portion, and the front plate portion and the base portion are in a parallel positional relationship. An example of the size of the front plate portion 120 is 3 mm or less in both length and width and a height of 1 mm or less. The front plate portion 120 and the base portion 110 are connected to each other by a column portion 130.

  As shown in FIGS. 1A and 2A, the first slot 140 and the second slot 150 are provided to face the front plate portion 120. The first slot 140 and the second slot 150 are formed in a U-shaped groove shape between the front surface side of the base portion 110 and the back surface side of the front plate portion 120. An example of the width of each slot 140 and slot 150 is 0.5 mm, and an example of the depth is 0.5 mm. Wires are held in the grooves constituting the first slot 140 or the second slot 150.

  The wire can be straight or used by the orthodontist to bend the wire according to the shape of the individual's teeth and treatment steps, or an arch that has already been bent according to the average tooth shape ( Archwire). In the following description of the present invention, it is assumed that an arch wire is used. However, the wire of the present invention is not limited to an arch wire. The arch wire is a wire used for moving teeth using elasticity, and the material is usually stainless steel, cobalt chromium alloy, nickel titanium alloy or the like.

  The grooves of the first slot 140 and the second slot 150 are formed according to the cross-sectional shape of the archwire. That is, if the cross-sectional shape of the archwire is a square, the shape of the grooves constituting the slots 140 and 150 is also made to correspond to the square. If the cross-sectional shape of the archwire is a rectangle, the shape of the grooves constituting the slots 140 and 150 is also made to correspond to the rectangle. Thus, by forming the grooves constituting the slots 140 and 150 in accordance with the cross-sectional shape of the archwire, the archwire can be reliably held in the slots 140 and 150. If there are corners in the grooves of the first slot 140 and the second slot 150, the corners are chamfered. Thereby, the friction which arises between the outer surface of an archwire and each slot 140,150 can be reduced.

  Here, as shown in FIG. 2A, the first slot 140 and the second slot 150 have flat bottom surfaces 140a and 150a on the base part 110 side. The bottom surface 140a of the first slot 140 and the bottom surface 150a of the second slot 150 are inclined at different angles when the back surface of the base portion 110 is used as a reference surface. In the example of FIG. 2A, the bottom surface 140 a of the first slot 140 is formed substantially parallel to the back surface of the base portion 110. That is, the angle formed between the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 is approximately 0 degrees.

  On the other hand, the bottom surface 150 a of the second slot 150 is formed with an inclination of θ degrees with respect to the back surface of the base portion 110. In other words, the angle formed between the bottom surface 150a of the second slot 150 and the back surface of the base portion 110 is θ degrees. θ is, for example, 1 to 45 degrees. If θ is greater than 45 degrees, the column 130 cannot be connected to the front plate 120. Another example of θ is 5 to 30 degrees, and may be 10 to 25 degrees. Further, the center line of the second slot 150 is configured to be inclined toward the support column 130 so that the archwire 200 is not easily detached. The direction in which the groove of the first slot 140 extends and the direction in which the groove of the second slot 150 extend are configured to be substantially parallel to each other.

  As shown in FIG. 2B, the vertical hole 160 is formed through the base portion 110 in a direction substantially perpendicular to the direction in which the grooves of both the slots 140 and 150 extend. The vertical hole 160 has an inner diameter of 0.5 mm. An example of the size of the vertical hole 160 is an inner diameter of 0.1 mm to 2 mm. A spring, a ligature wire or the like can be inserted into the vertical hole 160. By inserting a spring into the vertical hole 160, the inclination of the teeth can be corrected. By inserting the ligature wire into the vertical hole 160, the position of the bracket 100 can be maintained and the teeth can be pulled.

Next, a usage example of the orthodontic bracket 100 of the present invention will be described with reference to the drawings.
FIG. 3 is a diagram showing a usage example of the orthodontic bracket in the embodiment of the present invention. FIG. 3A is a perspective view showing a state in which the orthodontic bracket is fixed to the tooth surface and the archwire is held by the orthodontic bracket. FIG. 3B is a perspective view of FIG. FIG. The upper side of FIG. 3A and the left side of FIG. 3B are illustrated as the upper side of the teeth (the gum side in the case of upper teeth).

  As shown in FIG. 3A and FIG. 3B, the orthodontic bracket 100 is used by being fixed to the surface T of the tooth to be corrected by an adhesive. The orthodontic bracket 100 is usually fixed to a plurality of teeth and holds the archwire 200. The wire may be fixed by inserting a ligature wire between the wire inserted into the slot and the front plate portion. Further, the wire may be fixed by inserting synthetic rubber between the wire inserted into the slot and the front plate portion. At this time, since the orthodontic bracket 100 of the present invention has the front plate portion, the friction between the arch wire and the ligature wire and the friction between the arch wire and the synthetic rubber can be controlled. Controlling the friction applied to the archwire in this way is very effective in orthodontic treatment. In the example indicated by the solid line in FIG. 3A and FIG. 3B, the archwire 200 is held in the first slot 140.

  The bottom surface 140a constituting the first slot 140 is formed substantially parallel to the back surface of the base portion 110 as described above. That is, the angle formed between the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 is approximately 0 degrees. For this reason, when the archwire 200 is held by the orthodontic bracket 100, the load of the archwire 200 is applied in a direction substantially perpendicular to the back surface of the base portion 110. When the archwire 200 is held in the first slot 140, the second slot 150 can be attached with a detachable hook, for example. As a result, the rubber can be hooked on the removable hook. Thus, the slot where the archwire is not inserted can also be used for various purposes in correction.

  Next, the state in which the archwire 200 is held in the second slot 150 is observed. In FIG. 3B, the state where the archwire 200 is held in the second slot 150 is indicated by a one-dot chain line (virtual line).

  The bottom surface 150a constituting the second slot 150 is formed with an inclination of θ degrees with respect to the back surface of the base portion 110 as described above. That is, the angle formed by the bottom surface 150a of the groove constituting the second slot 150 and the back surface of the base portion 110 is θ degrees. In this case, the archwire 200 is inserted into the second slot 150 in a twisted manner. For this reason, a force (restoring force) for the archwire to return to the original is applied to the second slot 150. Specifically, the restoring force of the archwire 200 is a clockwise turning force as shown in FIG. This turning force is transmitted to the teeth via the base portion 110 and acts to turn the teeth clockwise. By continuously applying such a turning force to the teeth, the teeth can be moved in the direction shown in FIG. Thereby, the dentition can be corrected.

  In this way, by changing (setting) the orientation of the bottom surfaces 140a and 150a of the slots 140 and 150, the load direction applied to the tooth surface when the wire 200 is held in the slots 140 and 150 is changed (determined). can do. In the present invention, the angle formed between the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 is different from the angle formed between the bottom surface 150a of the second slot 150 and the back surface of the base portion 110. Therefore, one slot can be selected from the two slots 140 and 150 in accordance with the load direction to be applied to the tooth to be corrected. As a result, the load direction of the archwire 200 can be selected in accordance with the direction in which the teeth to be corrected are desired to move, and the load of the archwire 200 can be efficiently applied to the teeth to be corrected.

  Here, as shown in FIG. 3B, the first and second slots 140 and 150 are arranged so as to face the back surface of the front plate portion 120. That is, the width of the column part 130 is narrower than the width of the front plate part, whereby the first slot 140 and the second slot 150 are formed on both sides of the column part 130. A region where the first and second slots 140 and 150 are formed is included inside a region where the front plate portion 120 is projected to the base portion 110 side.

  In this way, when the first and second slots 140 and 150 and the front plate portion 120 are arranged, when the slots 140 and 150 are viewed from the front plate portion 120 side, the slots 140 and 150 are viewed. Becomes a shadow of the front plate part 120 and the slots 140 and 150 cannot be seen. For this reason, when the archwire 200 is held in the first or second slot 140, 150, the archwire 200 is shielded by the front plate portion 120, and the held archwire 200 is removed from the front plate portion 120 side. I can't see it. As a result, the archwire 200 can be hidden from others, and aesthetics can be enhanced.

  Moreover, in the conventional orthodontic bracket described in Patent Document 1, the archwire is held at the center of the bracket. For this reason, for example, when the orthodontic bracket 100 is attached to the anterior teeth of the lower jaw, the upper teeth may bite the archwire. On the other hand, in the orthodontic bracket 100 of the present invention, the archwire 200 is held in the first or second slot 140, 150 formed at a position deviated from the central portion. Therefore, in the orthodontic bracket 100 of the present invention, the arch wire 200 is held at a position deviated from the center of the orthodontic bracket 100. For this reason, for example, when the orthodontic bracket 100 is attached to the anterior teeth of the lower jaw, the orthodontic brackets are arranged so that the orthodontic bracket 100 is biased and arranged below the lower jaw teeth (gum side). The bracket 100 can be fixed to the teeth. By doing in this way, the orthodontic bracket 100 part which exists in the upper part of the arch wire 200 can be decreased. Accordingly, it is possible to make it difficult for the upper teeth to bite the orthodontic bracket 100.

  As described above, the orthodontic bracket 100 according to the present invention can change the load direction of the archwire 200 by simply exchanging the arrangement of the first slot 140 and the second slot 150 with respect to the teeth to be corrected. The load direction on the teeth can be easily switched. In this way, an orthodontic bracket that can be used in reverse can be provided. The present invention is not limited to a bracket that can be used in reverse, and may be a bracket in which only the second slot described above is formed. In that case, an angle formed by the bottom surface of the second slot and the back surface of the base portion 110 is set in accordance with the tooth to be corrected.

  The embodiments of the present invention have been described above by way of example, but the scope of the present invention is not limited to these, and can be changed or modified according to the purpose.

  In the description of the above embodiment, the bottom surface 140 a of the first slot 140 is formed substantially parallel to the back surface of the base portion 110. At this time, the angle formed between the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 is about 0 degrees. However, the angle formed between the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 may not be about 0 degrees. That is, as with the second slot 150, the bottom surface 140 a of the first slot 140 may be formed with an inclination of δ degrees with respect to the back surface of the base portion 110. At this time, the angle formed between the bottom surface 140a of the first slot 140 and the back surface of the base portion 110 is δ degrees. Also in this case, δ is, for example, about 0 to 45 degrees (where θ ≠ δ). Even with such a configuration, the above-described effects of the present invention can be obtained.

  FIG. 4 shows the back surface of the base portion in a modification of the orthodontic bracket of the present invention. As shown in FIG. 4, in the present invention, a plurality of adhesive grooves 113 (hatching portions) may be formed on the back surface of the base portion 110. Thereby, when the back surface of the base part 110 is attached to the surface of the tooth to be corrected with an adhesive, the adhesive can be held between the back surface of the base part 110 and the tooth surface. As a result, the orthodontic bracket 100 can be reliably attached to the tooth surface.

  The present invention can be used in the technical field related to an orthodontic bracket for holding a wire such as an arch wire.

FIG. 1 is a perspective view showing a configuration of an orthodontic bracket according to an embodiment of the present invention. FIG. 1 (a) is a perspective view seen from the upper surface side, and FIG. 1 (b) is a perspective view seen from the back surface side. FIG. FIG. 2 is a plan view showing the configuration of the orthodontic bracket according to the embodiment of the present invention, FIG. 2 (a) is a view as seen from the direction of arrow A in FIG. 1 (a), and FIG. It is a B arrow line view of 1 (a). FIG. 3 is a view showing an example of use of the orthodontic bracket according to the embodiment of the present invention, and FIG. 3 (a) is a diagram in which the orthodontic bracket is fixed to the tooth surface and the orthodontic bracket is arched. It is a perspective view which shows the state with which the wire was hold | maintained, FIG.3 (b) is a C arrow line view of Fig.3 (a). FIG. 4 is a back view of the base portion in a modification of the orthodontic bracket of the present invention.

DESCRIPTION OF SYMBOLS 100 Orthodontic bracket 110 Base part 111 Curved surface 112 Plane 113 Adhesive groove 120 Front plate part 130 Supporting part 140 First slot 150 Second slot 160 Vertical hole 200 Arch wire

Claims (7)

A base (110);
A front plate portion (120) connected to the base portion (110) so as to face the base portion (110),
An orthodontic bracket for holding a wire between the base portion (110) and the front plate portion (120),
In order to hold the wire, it has first and second slots (140, 150) formed in a groove shape between the base part (110) and the front plate part (120),
The first and second slots (140, 150) have planar bottom surfaces (140a, 150a) on the base part (110) side,
The angle formed between the bottom surface (140a) of the first slot and the back surface of the base portion (110) is different from the angle formed between the bottom surface (150a) of the second slot and the back surface of the base portion (110). An orthodontic bracket characterized by being formed as described above.   One of an angle formed between the bottom surface (140a) of the first slot and the back surface of the base portion (110) and an angle formed between the bottom surface (150a) of the second slot and the back surface of the base portion (110). The orthodontic bracket according to claim 1, wherein is 0 degrees.   The orthodontic bracket according to claim 1, wherein a direction in which the first slot (140) extends is parallel to a direction in which the second slot (150) extends.   The orthodontic bracket according to claim 1, wherein the first and second slots (140, 150) are formed according to a cross-sectional shape of the wire. The first and second slots (140, 150) are provided to face the front plate portion (120),
The front plate is formed such that a region where the first and second slots (140, 150) are formed is included inside a region where the front plate portion (120) is projected onto the base portion (110) side. The orthodontic bracket according to claim 1, wherein a portion (120) is formed.   The orthodontic bracket according to claim 1, wherein a concave groove (113) is formed on a back surface of the base portion (110). A concave curved surface (111) is formed at the center of the back surface of the base portion (110),
The orthodontic bracket according to claim 1, wherein flat surfaces (112) are formed at both end portions sandwiching the central portion of the back surface of the base portion (110).

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