JP5000954B2 - Orthodontic bracket - Google Patents

Description

  The present invention relates to an orthodontic bracket.

  Conventionally, when performing orthodontic treatment to correct the alignment of teeth, each of the tooth surfaces is attached with an orthodontic bracket, and the orthodontic brackets are mounted on each of the adjacent orthodontic brackets, Appropriate dentition condition by applying a predetermined tension to the wire and causing an interaction such as friction between the wire and the orthodontic bracket, and applying a corrective force to the teeth via the orthodontic bracket It is straightening.

  The straightening bracket is provided with a substantially U-shaped groove into which a straightening wire can be inserted, and after inserting the wire into this groove, an adhesive is filled in the groove to fix the wire, A force corresponding to the tension applied to the wire is applied to the orthodontic bracket, and the orthodontic force is applied to the teeth via the orthodontic bracket.

  However, when the wire is fixed to the orthodontic bracket through an adhesive, the wire does not displace relative to the orthodontic bracket, so that it can be corrected by applying sufficient force to the teeth immediately after mounting, Since the force acting on the teeth gradually decreases as the dentition is corrected, it is desirable that the wire be displaceably mounted on the orthodontic bracket in order to suppress such a decrease in force. It has been known.

Therefore, the metal fitting for correction prevents a dropout of the wire from the groove by locking the wire with the groove inserted into the base part in which the groove into which the wire is inserted is formed and the base part. In particular, it is made up of a locking piece, and in particular, the locking piece functions as a leaf spring, and the wire is held in the groove to the extent that it can be displaced relative to the base portion by the urging force generated in the locking piece. Metal fittings have been proposed (see, for example, Patent Document 1).
JP 2001-104340 A

  However, in the case where the wire is held using the locking piece as a leaf spring, the structure of the base portion on which the locking piece is mounted becomes complicated in order to generate an urging force on the locking piece. Therefore, it was supposed to increase the cost of the orthodontic bracket.

  In addition, since the urging force acts on the locking piece, it is necessary to work against the urging force of the locking piece when the wire is mounted on the base portion, and the tooth on which the base portion is mounted. Due to the excessive force, the person to be corrected may feel uncomfortable when the wire is attached.

  In view of such a current situation, the present inventor makes it possible to attach a wire to an orthodontic appliance very easily, so that the person to be corrected is uncomfortable. Research has been conducted to provide orthodontic appliances that do not have any of them, and the present invention has been accomplished.

In the orthodontic bracket of the present invention, an insertion groove into which a wire is inserted is provided transversely at the front end, and a prismatic base having a joining surface joined to the tooth surface via an adhesive at the rear end. A base and a stopper that is detachably attached to the front end of the base and prevents the wire inserted into the insertion groove from falling off the insertion groove. The stopper is disposed to face the insertion groove. A closing plate that closes at least a part of the insertion groove, and a first overlapping plate and a second overlapping plate that protrude from the closing plate and overlap each other on the side surface of the base portion, respectively, Engagement claws that engage with the base part are provided at the tips of the first superposition plate and the second superposition plate, and the base part has transversely engaging grooves that respectively engage with the engagement claws. And at least one of the side surfaces where the engagement groove is formed is engaged with the engagement groove. A slit for dividing the groove into two is provided, and a first convex portion is provided on one side surface of the base portion so as to protrude in parallel with the slit by the thickness dimension of the first overlapping plate, On the other side surface, a second convex portion was provided so as to protrude in parallel with the slit by the thickness dimension of the second overlapping plate.

Furthermore, the orthodontic bracket of the present invention is also characterized by the following points. That is,
(1 ) The base portion is provided with a recess for a chain for engaging and mounting the rubber chain on the side surface on the rear end side of the engagement groove.

According to the first aspect of the present invention, the prismatic base having the insertion groove into which the wire is inserted is provided in the front end in a transverse manner and the joining surface joined to the tooth surface via the adhesive is provided in the rear end. A base and a stopper that is detachably attached to the front end of the base and prevents the wire inserted into the insertion groove from falling off the insertion groove. The stopper is disposed to face the insertion groove. A closing plate that closes at least a part of the insertion groove, and a first overlapping plate and a second overlapping plate that protrude from the closing plate and overlap each other on the side surface of the base portion, respectively, Engagement claws that engage with the base part are provided at the tips of the first superposition plate and the second superposition plate, and the base part has transversely engaging grooves that respectively engage with the engagement claws. And at least one of the side surfaces where the engagement groove is formed is engaged with the engagement groove. By providing a slit that divides the groove into two, it can be used as an extremely inexpensive orthodontic bracket, and it can be attached with a single touch when the stopper is attached to the base, and the stopper can be stopped in a very short time. Therefore, it is possible to eliminate the possibility that the person to be corrected will feel uncomfortable when the wire is attached.
Further, a first convex portion is provided on one side surface of the base portion so as to protrude by the thickness dimension of the first overlapping plate in parallel with the slit, and parallel to the slit on the other side surface of the base portion. Since the second convex portions are provided by projecting by the thickness dimension of the second superposed plate, the first convex portion and the second convex portion are respectively engaged with the first superposed plate and the second superposed plate, respectively. The displacement along the longitudinal direction of the groove and the second engagement groove is regulated to prevent the stopper mounted on the base portion from being displaced.

  Moreover, when removing the stopper from the base part, by providing a slit on the side of the base part, a probe or other instrument can be inserted into the slit part, and the probe is inserted while the probe is being inserted into the slit part. The engaging claw can be detached from the engaging groove by being hooked on the engaging claw and deforming the overlapping plate with the probe, and can be removed very easily.

According to a second aspect of the present invention, in the orthodontic bracket according to the first aspect, the base portion is mounted with the rubber chain engaged with the side surface on the rear end side of the engagement groove. By providing a recess for the chain, it is possible to prevent the rubber chain attached to the base part from coming into contact with the wire attached to the base part, and the contact between the rubber chain and the wire It can prevent that suppression of the displacement of a wire arises and can prevent that correction is inhibited.

  As shown in FIGS. 1 to 3, the orthodontic bracket of the present invention includes a base portion 10 and a stopper 20 attached to the base portion 10. 1A is a left side view of the base unit 10, FIG. 1B is a plan view of the base unit 10, FIG. 1C is a front view of the base unit 10, and FIG. FIG. 1E is a cross-sectional view taken along the line XX of FIG. 1D, and FIG. 1F is a right side view of the base 10.

  The base portion 10 is a prismatic metal body, and a front end is provided with an insertion groove 11 into which a wire is inserted, and a rear end is joined to be joined to the tooth surface via an adhesive. A surface 12 is provided. The metal body used for the base 10 may be any metal as long as it is medically safe.

  The joining surface 12 is an inclined surface that is inclined with respect to the front-rear direction of the base portion 10 having a prismatic shape, and the inclination angle of the joining surface 12 is determined when the base portion 10 is attached to a tooth. The front / rear direction is adjusted to be horizontal. In particular, the joint surface 12 can be adjusted in inclination angle by grinding or the like before being attached to the person to be corrected.

  In addition, the base unit 10 adjusts the inclination angle of the joint surface 12 and adjusts the front-rear direction to the horizontal direction, so that when the base unit 10 is mounted on the tooth surface facing the outside of the mouth, the base unit 10 Since the projected area of the base part 10 in the forward direction can be minimized and the base part 10 can be made inconspicuous, the appearance can be improved.

  In consideration of adjustment of the inclination angle of the joint surface 12, it is desirable that the base part 10 be formed longer in the front-rear direction by the adjustment allowance. Alternatively, in order to reduce the labor of adjustment work, a plurality of types of base parts 10 with different inclination angles of the joint surface 12 may be prepared in advance.

  The insertion groove 11 is provided transversely on the end face 13 on the front end side of the base part 10, and in particular, a pair of first side face 14-1 and second side face that are parallel to each other in the base part 10 having a quadrangular prism shape. Parallel to 14-2.

  The first side surface 14-1 is provided with a concave first engagement groove 15-1 arranged in a transverse manner in parallel with the insertion groove 11, and the base portion 10 is located more than the first engagement groove 15-1. A concave first chain recess 16-1 is provided on the rear end side in parallel with the insertion groove 11. The first engagement groove 15-1 is a slit-like groove that can be engaged with a first engagement claw 25-1 described later, and the first chain recess 16-1 is engaged with a rubber chain described later. A semicircular groove is possible.

  In addition, the first side surface 14-1 is provided with a first recess 17-1 that is recessed in the longitudinal direction of the base portion 10 between the first engagement groove 15-1 and the end surface 13. As the first concave portion 17-1 is disposed, the first side surface 14-1 has two first convex portions that protrude relative to the bottom surface of the first concave portion 17-1. Portions 18-1 and 18-1 are provided along the side edges of the first side surface 14-1.

  The second side surface 14-2 is provided with a concave second engagement groove 15-2 arranged transversely in parallel with the insertion groove 11, and the base portion 10 is located more than the second engagement groove 15-2. A concave second chain recess 16-2 is provided in parallel with the insertion groove 11 on the rear end side. The second engagement groove 15-2 is a slit-like groove that can be engaged with a second engagement claw 25-2 described later, and the second chain recess 16-2 is engaged with a rubber chain described later. A semicircular groove is possible.

  Further, the second side surface 14-2 is provided with a second concave portion 17-2 which is recessed in the front-rear direction of the base portion 10 between the second engagement groove 15-2 and the end surface 13. With the arrangement of the second recess 17-2, the second side surface 14-2 has two second protrusions that protrude relative to the bottom surface of the second recess 17-2. The portions 18-2 and 18-2 are provided along the side edge of the second side surface 14-2.

  Further, the first side surface 14-1 is provided with a slit 19 along the front-rear direction of the base portion 10, and the first engaging groove 15-1 intersecting with the slit 19 is divided into two.

  As shown in FIGS. 2 and 3, the stopper 20 includes a flat plate-like closing plate 21 that faces the end surface 13 of the base portion 10 provided with the insertion groove 11, and a base portion protruding from the closing plate 21. A metal body having a portal shape with a first superposition plate 24-1 superposed on the first side surface 14-1 of 10 and a second superposition plate 24-2 superposed on the second side surface 14-2 of the base portion 10. It consists of. The metal body used for the stopper 20 may be any metal as long as it is medically safe.

  A first engagement claw 25-1 that engages with a first engagement groove 15-1 provided in the base portion 10 is provided at the front end of the first overlap plate 24-1, and the second overlap plate 24- A second engagement claw 25-2 that projects into the second engagement groove 15-2 provided in the base portion 10 is projected from the distal end of the base 2.

  In the orthodontic bracket, the first overlapping plate 24-1 of the stopper 20 is overlapped with the first side surface 14-1 of the base portion 10, and the second overlapping plate 24-2 of the stopper 20 is overlapped with the base portion 10. The stopper 20 is pushed into the base portion 10 from the front end side of the base portion 10 while being superimposed on the second side surface 14-2 of the base plate 10 to engage the first engaging claw 25-1 with the first engaging groove 15-1. In addition, the stopper 20 can be detachably mounted on the base portion 10 by engaging the second engagement claw 25-2 with the second engagement groove 15-2.

  In particular, when the stopper 20 is mounted on the base part 10, the closing plate 21 of the stopper 20 faces the end surface 13 of the base part 10, and at least part of the insertion groove 11 provided in the base part 10 is closed. The plate 21 is closed to prevent the wire inserted into the insertion groove 11 from dropping from the insertion groove 11 as will be described later.

  In this way, in the orthodontic bracket, it is possible to mount with one touch as it can be mounted while pushing the stopper 20 into the front end of the base part 10 provided with the insertion groove 11 into which the wire is inserted at the front end. Since the stopper 20 can be attached in an extremely short time, the possibility that the person to be corrected will feel uncomfortable can be eliminated.

  In the present embodiment, the first engaging claw 25-1 and the second engaging claw 25-2 are formed by folding the leading edges of the first overlapping plate 24-1 and the second overlapping plate 24-2 in a folded shape. However, the first engagement claw 25-1 and the second engagement claw 25-2 are not limited to this form, and the first engagement groove 15-1 provided in the base portion 10 and It is only necessary to be able to engage with the second engagement grooves 15-2.

  In the present embodiment, the stopper 20 performs a bending process by a first press process on a flat metal plate having a predetermined outer shape, so that the first engagement claw 25-1 and the second engagement claw 25 are provided. -2 is formed, and then the first superposition plate 24-1 and the second superposition plate 24-2 are formed so as to protrude from the closing plate 21 by performing a bending process by the second press working.

  An opening 26 communicating with the slit 19 is formed in the first overlapping plate 24-1 overlapping the first side surface 14-1 provided with the slit 19, and a probe is formed in the opening 26 as shown in FIG. 30 is inserted, and the tip of the probe 30 is hooked on the first overlapping plate 24-1 or the first engaging claw 25-1, and the first overlapping plate 24-1 is bent to thereby bend the first engaging claw 25. -1 can be detached from the first engagement groove 15-1 very easily, and the stopper 20 can be detached from the base portion 10.

  In this way, the stopper 20 can be removed from the base part 10 very easily, so that the person to be corrected may feel uncomfortable not only when the stopper 20 is attached to the base part 10 but also when the stopper 20 is detached. Can be resolved.

  The slit 19 is provided to facilitate the engagement of the probe 30 with the first overlapping plate 24-1 or the first engagement claw 25-1, and the insertion portion of the probe 30 However, since the base portion 10 itself is extremely small, it can be easily formed by forming the slit 19 with the first side surface 14-1 cut vertically. it can.

  The first concave portion 17-1 provided on the first side surface 14-1 has a flat bottom surface in contact with the first superposition plate 24-1, and is recessed by the thickness dimension of the first superposition plate 24-1. Similarly, the second recess 17-2 provided on the second side surface 14-2 has a bottom surface that is in contact with the second overlapping plate 24-2, and is recessed by the thickness of the second overlapping plate 24-2. ing.

  That is, the first convex portions 18-1 and 18-1 are protruded by the thickness dimension of the first superposition plate 24-1, and the upper surface of the first convex portions 18-1 and 18-1 and the first superposition plate The appearance of the base 10 with the stopper 20 attached is improved by positioning the upper surface of 24-1 on the same plane so that no step is generated. Similarly, the second convex portions 18-2 and 18-2 are projected by the thickness dimension of the second overlapping plate 24-2, and the second convex portions 18-2 and 18-2 are overlapped with the upper surface of the second convex portions 18-2 and 18-2. The upper surface of the plywood 24-2 is positioned on the same plane so that no step is generated, and the appearance in a state where the stopper 20 is attached to the base portion 10 is improved.

  Moreover, the first protrusions 18-1, 18-1 and the second protrusions 18-2, 18-2 are respectively formed in the first engagement grooves 15 of the first overlapping plate 24-1 and the second overlapping plate 24-2. -1 and the displacement of the second engagement groove 15-2 along the longitudinal direction are restricted to prevent the stopper 20 mounted on the base 10 from being displaced.

It should be noted that the frictional resistance between the overlapping first concave portion 17-1 and the first overlapping plate 24-1 and the frictional resistance between the overlapping second concave portion 17-2 and the second overlapping plate 24-2 are sufficiently large. Can prevent the stopper 20 from being displaced with respect to the base portion 10 by this frictional resistance, and therefore, as shown in the reference example of FIG. 5, the first convex portions 18-1, 18-1 and the second convex portions 18-2, 18-2 is not necessarily provided.

  The closing plate 21 does not necessarily have the same length as the insertion groove 11 provided on the end surface 13 on the front end side of the base portion 10 as shown in FIG. 3, but the length of the insertion groove 11 as shown in FIG. The width may be narrower than the width.

  As described above, when the closing plate 21 is narrow, as shown in FIG. 7, the wire 40 is inserted into the insertion groove 11 of the adjacent base portion 10 and the stopper 20 is placed in a state where the tooth alignment is extremely poor. When the wire 40 is bridged while being mounted on the base unit 10, the operation can be facilitated.

  Then, as the tooth alignment is corrected, the wire 40 can be appropriately corrected without being replaced by sequentially replacing the block plate 21 with one having a larger width dimension.

  That is, if the tooth alignment is corrected even a little, the correction force acting on each tooth via the wire 40 and the base 10 will be weakened, and the correction action will be reduced. Reattachment of the wire 40 is performed so that an appropriate force is applied. However, in the orthodontic bracket of the present invention, the contact between the wire 40 and the closing plate 21 is increased by increasing the width dimension of the closing plate 21. The required correction force is obtained by enlarging the region and increasing the force generated by the interaction between the wire 40 and the closing plate 21.

  Therefore, since it is not necessary to replace the wire 40, workability can be improved and the work can be completed in a short time.

  In particular, when the degree of correction is advanced, as shown in FIG. 8, the width dimension of the closing plate 21 is larger than the width dimension of the first side surface 14-1 and the second side surface 14-2 of the base part 10. By using the stopper 20, the magnitude of the force generated by the interaction with the wire 40 can be increased while reducing the size of the base part 10 as much as possible. Cost can be reduced.

  In the orthodontic bracket constructed as described above, not only the wire 40 but also a rubber chain 50 provided with bracket insertion holes 51 at predetermined intervals as shown in FIG. It extends over the base part 10 so that correction using the shrinkage force of the rubber chain 50 can be performed.

  In particular, as described above, the base 10 is provided with the first chain recess 16-1 and the second chain recess 16-2 with which the rubber chain 50 is engaged. By engaging the rubber chain 50 with the recess 16-1 for the chain and the recess 16-2 for the second chain, the rubber chain 50 can be stably held.

  Moreover, the first chain recess 16-1 and the second chain recess 16-2 are provided on the rear end side of the base portion 10 with respect to the first engagement groove 15-1 and the second engagement groove 15-2. Therefore, it is possible to prevent the rubber chain 50 attached to the base portion 10 and the wire 40 attached to the base portion 10 from coming into contact with each other, and the displacement of the wire 40 due to the contact between the rubber chain 50 and the wire 40 can be prevented. Can be prevented, and correction can be prevented from being inhibited.

  When attaching the rubber chain 50 to the base part 10, after attaching the base part 10 to the teeth, the rubber chain 50 is inserted while the base part 10 is inserted into each metal fitting insertion hole 51 of the rubber chain 50. 50 is mounted, and then the wire 40 is inserted into the insertion groove 11 of each base 10 and the stopper 20 is mounted on the base 10 to bridge the wire 40.

  FIG. 11 is a perspective view of another embodiment of the present invention, and the orthodontic bracket is also mounted on the base portion 10 ′ having the insertion groove 11 ′ formed at the front end and the base portion 10 ′. Thus, the stopper 20 'is configured to hold the wire inserted into the insertion groove 11' in the insertion groove 11 '.

  In particular, the base portion 10 'is provided with a flange-like joining plate 12' at the rear end, and the base is increased by increasing the joining area when the back surface of the joining plate 12 'is attached to the teeth as a joining surface. The part 10 'can be stably attached to the teeth.

  The joining plate 12 ′ may be formed of a metal plate that is separate from the base portion 10 ′, and the base portion 10 ′ may be joined to the joining plate 12 ′, or the base portion may be formed by cutting or casting. 10 ′ and the joining plate 12 ′ may be integrally formed.

  The insertion groove 11 ′ is formed in the front end side of the base portion 10 ′ so as to be parallel to the first side surface 14-1 ′ and the second side surface 14-2 ′ which are parallel to each other in the pair of base portions 10 ′ having a rectangular column shape. Is provided in a transverse manner on the end face 13 '.

  The first side surface 14-1 ′ is provided with a first concave portion 17-1 ′ that is recessed in the longitudinal direction of the base portion 10 ′. At the same time, the first side surface 14-1 ′ is provided with two first convex portions 18-1 ′ and 18-1 ′ that protrude relatively to the bottom surface of the first concave portion 17-1 ′. It is provided along the side edge of one side surface 14-1 '.

  Similarly, the second side surface 14-2 ′ is provided with a second concave portion 17-2 ′ that is recessed in the longitudinal direction of the base portion 10 ′. With the arrangement, the second side surface 14-2 ′ has two second convex portions 18-2 ′ and 18-2 that protrude relative to the bottom surface of the second concave portion 17-2 ′. 'Is provided along the side edge of the second side surface 14-2'.

  In the first recess 17-1 ′ and the second recess 17-2 ′, an engagement groove 15 ′ that engages with an engagement claw 25 provided in the stopper 20 ′ is provided as will be described later. The engagement groove 15 is provided in parallel with the insertion groove 11 ′. In the present embodiment, the engagement groove 15 ′ is provided between the first protrusions 18-1 ′ and 18-1 ′ and between the second protrusions 18-2 ′ and 18-2 ′. Although the side surface 14-1 'and the second side surface 14-2' are not completely traversed, this state also crosses the engagement groove 15 'on the first side surface 14-1' and the second side surface 14-2 '. It is assumed that

  The base portion 10 'is provided with a second chain recess 16' on the rear end side of the engagement groove 15 '. Further, the base portion 10' has front and rear sides on the first side surface 14-1 '. A slit 19 'along the direction is provided.

  The stopper 20 ′ includes a flat closing plate 21 ′ opposed to the end surface 13 ′ of the base portion 10 ′ provided with the insertion groove 11 ′, and a projection of the base portion 10 ′ protruding from the closing plate 21 ′. The first superposition plate 24-1 'superposed on one side surface 14-1' and the second superposition plate 24-2 'superposed on the second side surface 14-2' of the base 10 'are formed in a portal shape. It consists of a metal body.

  A first engagement claw 25-1 ′ that engages with an engagement groove 15 ′ provided in the base portion 10 ′ protrudes from the tip of the first overlap plate 24-1 ′, and the second overlap plate 24- A second engagement claw 25-2 ′ that engages with a second engagement groove 15-2 ′ provided in the base portion 10 ′ protrudes from the tip of 2 ′.

  Further, the first overlapping plate 24-1 ′ is provided with an opening 26 ′ communicating with the slit 19 ′ provided in the base portion 10 ′.

  In the stopper 20 ′ of the present embodiment, the closing plate 21 ′ that closes the insertion groove 11 ′ provided in the base portion 10 ′ is unevenly distributed on the end surface 13 ′ on the front end side of the base portion 10 ′. 11 'is partially blocked.

  As described above, the blocking plate 21 ′ may be arranged so as to be unevenly distributed with respect to the end surface 13 ′, and in consideration of the interaction with the wire laid between the adjacent orthodontic brackets, the blocking plate 21 ′. A stopper 20 ′ having an appropriate shape can be used.

  Further, as shown in FIG. 12, the stopper 20 "has a tab 29 protruding outwardly from the first overlapping plate 24-1" and the second overlapping plate 24-2 "along the closing plate 21". ", 29" may be provided.

  The stopper 20 "is picked with the thumb and forefinger through the knobs 29" and 29 ", for example, and the closing plate 21" is bent back to form the first overlapping plate 24-1 "and the second overlapping plate 24-2". By widening the distance between the stoppers 20 ", the stopper 20" can be removed from the base without using a probe.

It is explanatory drawing of the base part of the orthodontic metal fitting concerning embodiment of this invention, (a) is a left view, (b) is a top view, (c) is a front view, (d) is a bottom view. (E) is XX sectional drawing of (d), (f) is a right view. It is a perspective view of the base and the stopper of the orthodontic bracket according to the embodiment of the present invention. It is a perspective view of the use state of the base and the stopper of the orthodontic bracket according to the embodiment of the present invention. It is explanatory drawing of the orthodontic metal fitting concerning embodiment of this invention. It is explanatory drawing of the base part of a reference example. It is explanatory drawing of the stopper of other embodiment. It is use condition explanatory drawing of the orthodontic metal fitting concerning embodiment of this invention. It is explanatory drawing of the stopper of other embodiment. It is explanatory drawing of a rubber chain. It is explanatory drawing of the use condition of a rubber chain. It is a perspective view of the orthodontic metal fitting concerning other embodiment. It is a perspective view of the stopper concerning other embodiments.

Explanation of symbols

10 base
11 Insertion groove
12 Joint surface
13 End face
14-1 First side
14-2 Second side
15-1 First engagement groove
15-2 2 engaging groove
16-1 First chain recess
16-2 Second chain recess
17-1 First recess
17-2 Second recess
18-1 First convex part
18-2 Second convex part
19 Slit
20 Stopper
21 Blocking plate
24-1 First superposition plate
24-2 2nd polymerization board
25-1 First engaging claw
25-2 Second engaging claw
26 Opening
30 tip
40 wires
50 Rubber chain
51 Bracket insertion hole

Claims (2)

An insertion groove into which a wire is inserted is provided in a transverse manner at the front end, and a prismatic base portion provided at the rear end with a joining surface joined to the tooth surface via an adhesive,
A stopper that detachably attaches to the front end of the base portion and prevents the wire inserted into the insertion groove from dropping from the insertion groove;
The stopper is disposed opposite the insertion groove and closes at least a part of the insertion groove, and a first overlapping plate that protrudes from the closure plate and overlaps the side surface of the base portion. And a second superposition plate with a portal shape, and provided with engaging claws that engage with the base portion at the tips of the first superposition plate and the second superposition plate,
The base portion is provided with an engaging groove that engages with the engaging claw on the side surface in a transverse shape, and at least one of the side surfaces on which the engaging groove is formed intersects with the engaging groove. And providing a slit for dividing the engagement groove into two,
On one side surface of the base portion, a first convex portion is provided in parallel with the slit so as to protrude by the thickness dimension of the first overlapping plate, and on the other side surface of the base portion, the slit and An orthodontic bracket that is provided with a second convex portion that is projected in parallel with the thickness dimension of the second overlapping plate. The recess for a chain for engaging and mounting a rubber chain is provided on the side surface on the rear end side of the engagement groove in the base portion. Orthodontic bracket.

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