KR100845600B1 - A tooth bracket of tangled tooth for realignment - Google Patents

Abstract

A tooth bracket of tangled teeth for realignment is provided to transmit the force according to the leverage principle to a tooth uniformly by reducing the contact friction of an arch wire. A tooth bracket of tangled teeth for realignment includes a body portion(120), a base portion(110) and a connection portion(160). The body portion includes a first slot portion(140), a second slot portion and a round portion(150). An arch wire is inserted into the center part of the first slot portion. The base portion is attached to the surface of a tooth, has a bottom surface having a large cross section and a round portion on a protruding front corner. The connection portion connects the base portion and the body portion integrally, and a recess is formed on the entire portion of the side of the connection portion.

Description

Orthodontic Brackets {A TOOTH BRACKET OF TANGLED TOOTH FOR REALIGNMENT}

1 is a block diagram of an orthodontic bracket according to an example of the prior art,

Figure 2 is a state of use of the orthodontic bracket according to an example of the prior art,

3 is a side view of the orthodontic bracket according to the first embodiment of the present invention;

4 is a front view of the orthodontic bracket according to the first embodiment of the present invention;

5 is a plan view of the orthodontic bracket according to the first embodiment of the present invention,

Figure 6 is a perspective view of the orthodontic bracket according to the first embodiment of the present invention coupled to the arch wire with a ring or ligation line,

Figure 7 is a front perspective view of the orthodontic bracket according to the first embodiment of the present invention coupled with the arch wire in a ring or ligation line,

8 is a side view of the orthodontic bracket according to the second embodiment of the present invention;

9 is a front view of the orthodontic bracket according to the second embodiment of the present invention;

10 is a plan view of the orthodontic bracket according to the second embodiment of the present invention;

Figure 11 is a perspective view of the orthodontic bracket according to the second embodiment of the present invention coupled with the arch wire in a ring or ligation line,

12 is a front perspective view of the orthodontic bracket according to the second embodiment of the present invention coupled with an archwire in a ring or ligation line;

Figure 13 is a dimensional view of the orthodontic bracket front portion according to an embodiment of the present invention.

          ** Description of the symbols for the main parts of the drawings **

70: archwire 80: ring

100, 105: bracket 110, 115: base

120, 125: Body 130, 135: Front

140: first slot portion 143: second slot portion

145: slot portion 148: waist portion

150, 155: round part 160, 165: connection part

The present invention relates to a bracket for neatly correcting the arrangement of teeth by malocclusion, in particular, a small attachment area with the teeth and to ensure a sufficient distance to the adjacent brackets, less foreign matters and efficiently transfer a small force to the teeth The orthodontic bracket is fast and has an orthodontic bracket having a beautiful appearance.

Traditionally, the health of teeth in Korea is said to be one of five innate blessings. Especially, when talking, the other person sees the teeth around his or her mouth and the teeth cleanly and neatly aligned. Impressions and good feelings are felt, and this prejudice generally affects interpersonal relationships.

There are many ways to treat neatly and correctly corrected teeth, but there are generally two basic orthodontic treatments. Such orthodontics are the LIGHT WIRE treatment and the endorum treatment.

Lightweight wire treatment is a technique used to correct each tooth with a different force. blood. It was first proposed and performed by R. P. Begg.

That is, RP Begg, who has found that some types of teeth have relatively less gum resistance than others and that some types of teeth move faster than others, considers this interaction and needs to move properly. It was found that the arrangement of teeth can be neat by selectively moving.

Weg's lightweight wire therapy secures the brackets to all teeth, including molar, and straightens the alignment of the teeth with ARCH wires that look round in cross section. The archwires are loosely fixed to the brackets and are not strapped, but with minimal friction, and are contacted at one point to allow the teeth to slide, rotate, tilt and twist freely. In particular, tilting, twisting and rotating require suitable assistive devices.

Tedurum therapy is currently the most widely and widely used orthodontic treatment and was first proposed and performed by Dr. Edward H. Angle.

The edrum treatment uses archwires in the form of a circular cross section at the beginning, and the flexible arch arch wires move the teeth in the wrong position over a wide range with a small force.

An ARCH WIRE fits into a slot formed in a bracket that attaches to all permanent teeth including molar teeth and consists of a metal strip or elastic strip or other suitable form of mechanical support. The archwire is made of stainless steel or precious metal and is located between the lingual or lip of the tooth.

This rim treatment allows the tooth to be controlled in all directions, allowing any individual tooth to move simultaneously in three directions. For example, the front tooth can be moved to the lingual position and the archwire can be adjusted to rotate around the long axis of the tooth. The archwire has the same characteristics as the spring and the ligation line, which can twist the tooth to a predetermined range, and the torsional force is applied to the tooth through the archwire, so that the teeth are rotated until they are not twisted due to the spring and the ligament action of the archwire. And move.

The bracket has a siamese type with a twin shape in the front part and a single type with a single shape, and an arch wire is inserted into the middle part to be fixed, and an adhesive is attached to the surface of each tooth. By directing the force due to the elasticity of the archwire to the teeth to act tilted, twisted and rotated, it can be attached to the lingual side between the teeth and the tongue and the lingual side between the teeth and the tongue and the present invention It relates to a single type bracket to be attached to.

Referring to Figure 1 describes the structure of the orthodontic bracket according to an example of the prior art, the base portion 20 is attached to the surface of the tooth, the front portion 30 is attached to the teeth and connected to the lip region, archwire The slot portion 40 to be inserted, the front portion is extended to the jaw portion 50 to form a locking groove (60).

Referring to the orthodontic bracket 10 according to the prior art with reference to the accompanying Figures 1 and 2, when the orthodontics are to be corrected, the base portion 20 of the bracket 10 using an adhesive to each tooth Attach.

Each bracket 10 is attached to and fixed to the teeth so that the slot portion 40 maintains a straight line, the arch wire 70 is inserted into the slot portion 40, each bracket 10 is a ring made of rubber or the like (RING) ) And the arch wire 70 is fixed with a ligation line (WIRE) by a metal material. At this time, the ring and the ligation line is connected to the arch wire 70 is inserted into the locking groove 60 and is not separated by the jaw portion (50). In addition, as the arrangement of the teeth is corrected, the position of the teeth is changed, and frictional resistance is generated between the bracket and the archwire attached to the teeth.

These rings and ligation lines protrude while fixing the archwire 70 and the bracket 10, and are connected to the lips and visually exposed to others, giving discomfort and rejection, and foreign substances such as food are caught and not sanitary. There is a problem.

In addition, it is difficult to separate the ring and the ligation line inserted into the slot part 40 over time, and the contact area between the slot part 40 and the arch wire 70 is large and friction resistance is generated.

In addition, the ring and the ligation line for fixing the archwire is colored by food and the like over time to give the other party a visual disgust, discomfort and rejection, and the corners of the bracket 10 front portion 30 is angled When connected to the lips, there is a problem that gives a foreign body feeling uncomfortable to use.

The present invention is generated in the contact area with the teeth and the arch wire and does not reduce the foreign body to the tongue and lips in the state that the force transmitted to the teeth for orthodontics is not reduced and kept constant, in particular, the arch It is an object of the present invention to provide an orthodontic bracket which reduces the contact frictional force of the wire and thus the force by the lever principle is constantly transmitted to the tooth and the portion protruding outside the ring and the ligation line is small to maintain the aesthetic sense.

In addition, an object of the present invention is to provide an orthodontic bracket that is easy to install and remove the ring and the ligation wire fixing the bracket and the archwire and does not protrude so that the mounted state is maintained.

In addition, the object of the present invention is to provide an orthodontic bracket which reduces the overall time of orthodonticity by providing a constant friction force of the archwire even when the arrangement of teeth is moved due to less friction between the archwire and the bracket slot.

In order to achieve the above object, the present invention provides a bracket for fixing an arch wire and correcting an arrangement of teeth by a ring and a ligation line, wherein the arch wire is inserted into a central portion of the first slot having a short contact area. A body portion having a second slot portion into which the portion, the ring and the ligation line are inserted, each having a small cross-sectional area, and forming a round portion at a protruding edge; A base portion attached to and fixed to the surface of the tooth, the base portion having a wide cross section and forming a rounded portion at a protruding front edge; And a connection part integrally connecting the base part and the body part and having a groove formed at the entire side thereof to which the ring and the ligation line are inserted and fixed. Present a configuration that includes.

In order to achieve the above object, the present invention provides a bracket for fixing an arch wire by a ring and a ligation line and correcting an arrangement of teeth, wherein the arch wire is inserted into a center portion and has a short contact area. A body portion forming a butterfly wing shape and having a small cross section and forming a round portion at a protruding edge; A base portion attached to and fixed to the surface of the tooth and having a butterfly wing shape, the base portion having a wide cross section and forming a rounded portion at a protruding front edge; And a connecting portion integrally connecting the body portion and the base portion and having a cross section having a butterfly wing shape. Present a configuration that includes.

In order to achieve the above object, the present invention provides a bracket for fixing an arch wire by a ring and a ligation line and correcting an arrangement of teeth, wherein the length of the vertical straight line of the bracket is in the range of 3 to 4 mm. The straight length of the widest part in the bracket front part in the range of 1.3 to 2.3 mm, and the straight length of the shortest part in the waist of the bracket front part in the range of 1.3 to 2 mm.

Hereinafter, by the present invention of the configuration described above, with reference to the accompanying drawings the orthodontic bracket will be described in detail.

3 is a side view of the orthodontic bracket according to the first embodiment of the present invention, and FIG. 4 is a front view of the orthodontic bracket according to the first embodiment of the present invention. 5 is a plan view of the orthodontic bracket according to the first embodiment of the present invention, Figure 6 is a perspective view of the orthodontic bracket according to the first embodiment of the present invention coupled to the arch wire by a ring or ligation line, 7 is a front perspective view of the orthodontic bracket according to the first embodiment of the present invention coupled with an arch wire by a ring or ligation line, and FIG. 8 is a side view of the orthodontic bracket according to the second embodiment of the present invention. 9 is a front view of an orthodontic bracket according to a second embodiment of the present invention, FIG. 10 is a plan view of an orthodontic bracket according to a second embodiment of the present invention, and FIG. 11 is a second embodiment of the present invention. For example 1 is a perspective view of the orthodontic bracket coupled to the archwire with a ring or ligation line, Figure 12 is a perspective view of the orthodontic bracket according to the second embodiment of the present invention coupled to the archwire with a ring or ligation line, Figure 13 is a dimensional view of the orthodontic bracket front portion according to an embodiment of the present invention.

In describing an example of the present invention, drawings and descriptions which are not directly related to the present invention and well-known technical contents are omitted from the drawings, so that the gist of the present invention is clearly transmitted without obscuring the gist of the present invention.

Referring to Figures 3, 4 and 5, when describing the orthodontic bracket according to the first embodiment of the present invention, the base portion 110 is attached to the teeth and has a wide cross-sectional area; A body portion 120 having a front surface and having first and second slot portions respectively having an archwire, a ring and a ligation line inserted therein, and forming a round portion at a protruding edge; A connection part 160 which integrally connects the base part and the body part and has grooves into which the ring and the ligation line are inserted at four sides; It includes a configuration.

The body portion 120 is a front portion 130 in contact with the lips in the oral cavity; A first slot portion 140 in which a groove is formed in the middle portion of the front portion and into which the arch wire 70 is inserted; A round part 150 disposed at each corner of the front part and having a round shape without an angle; And a second slot portion 143 which reduces the length of the first slot portion and inserts the ring and the ligation line. This configuration is included.

The first slot portion 140 is configured to form the second slot portion 143 in a symmetrical structure at both ends and to reduce the contact cross-sectional area and contact friction with the arch wire 70.

The second slot portion 143 is formed at both ends of the first slot portion 140, respectively, to reduce the linear length of the first slot portion 140 is configured on the same plane as the connecting portion 160.

The body portion 120 is configured to be inclined to the surface that meets the connecting portion 160, and to be longer than the length of the base portion (110).

Hereinafter, the orthodontic bracket according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As a human tooth grows, malocclusion may occur due to various causes without normal occlusion. The malocclusion of teeth is easily caught by foreign substances such as food and the like, which causes bad smell and hurts the teeth, and gives a disgusting feeling of disgust and rejection and discomfort to the conversation partner, making it difficult to achieve a good interpersonal relationship. Severe malocclusion of teeth also affects the aesthetic sense of the face, causing inferiority. Orthodontic treatment is to treat the normal occlusal by continuously transmitting a force in a predetermined direction to the negatively occluded teeth. In general, orthodontic archwires and brackets are used, and the brackets are fixed by adhesive to the teeth to be corrected, and the archwires are not separated by using rings or ligation lines. Replace the elastic force with a stronger one and remove it when the orthodontist is completed.

In other words, orthodontic treatment is to continuously transfer the force of elasticity generated in the arch wire to the tooth through the bracket for a predetermined time, thereby treating the normal occlusal by shifting or moving the malocclusion tooth. The time required for orthodontics is relatively slow in children and slow in adults, but on average it takes about two years.

The orthodontic teeth are moved in position so that the contact point with the arch wire is changed. At this time, if the contact friction or frictional resistance between the arch wire and the bracket is large, the contact point is not smoothly moved, and the elastic force is applied by the lever principle. It is a technique of the present invention to solve the problem that the orthodontic treatment is not continuous and efficient because it is not delivered optimally. In addition, it is included in the technology of the present invention so that foreign matters caused by the brackets are not felt on the tongue and lips than the conventional brackets, maintaining aesthetic sense and preventing foreign matters such as food from being caught.

Body portion 120 and base portion 110 of the orthodontic bracket 100 is integrally configured through the connecting portion 160, the material is also made of the same material, for example, precious metals, synthetic resins, resins, It includes ceramic (CERAMIC) material and the like, and is composed of the same material.

The first slot part 140 formed on the front part 130 which is visually located in front of the body part 120 in a state where the bracket 100 is attached to the teeth, respectively, has a second slot part 143 at both ends thereof. To form. Each corner of the front portion 130 is provided with a round portion 150 to form a round (ROUND) shape so that foreign body does not occur on the tongue or lips.

The arch wire 70 is inserted into the first slot part 140, and the rubber ring 80 or the metal ligation line is formed by the groove formed by the connection part 160 and the second slot part 143. The arch wire 70 is fastened in a fixed state so as not to be separated from the first slot part 140 through the slot.

6 shows a state in which the bracket 100 according to the first embodiment of the present invention is fixed to the arch wire 70 by a ring 80 or a ligation line, and FIG. 7 is a ring 80 or a ligation line. The front perspective view of the bracket 100 and the archwire 70 according to the first embodiment of the present invention is shown.

The bracket 100 according to the first embodiment of the present invention has an advantage that the ring 80 or the ligation line for fixing the archwire 70 is inserted into the second slot part 143 so that it is visually clean from the front. In addition, since a portion of the side portion where the body portion 120 and the connection portion 160 meets to form an inclined slope, there is an advantage that the fastening and disassembly of the ring 80 or the ligation line is very easy. The ring 80 is replaced by a ligation line according to the type of tooth to which the bracket 100 is fixedly attached.

In particular, the length of the body portion 120 is longer than the length of the base portion 110 so that the fastening and disassembly of the ring and the ligation line 80 is easy, and the base portion 110 has a long width and a wide cross-sectional area with the teeth. The contact area is wide, and there is an advantage of efficiently transferring the force due to the elasticity of the archwire 70 to the teeth by the lever principle. In addition, since the length of the straight line is shortened by the second slot part 143 and the area connecting to the arch wire 70 becomes smaller, the first slot part 140 has less contact friction and thus the position according to the correction of the teeth. Even if the movement occurs, there is an advantage of transferring the force of the arch wire 70 in the optimum state.

Referring to FIGS. 8, 9 and 10, the orthodontic bracket 105 according to the second embodiment of the present invention will be described. An archwire has a slot portion 145 inserted into a central portion and having a short contact area. Body portion 125 has a butterfly wing shape; A base portion 115 attached to the tooth surface with an adhesive, having a butterfly wing shape, and having a wide cross section; A connecting portion 165 which integrally connects the body portion and the base portion and has a butterfly shape in cross section; It includes a configuration.

A surface where the butterfly wing end of the body portion 125 meets the connecting portion 165 has an inclined shape, the front portion 135 having a middle wing shape of a butterfly wing and contacting the lips in the oral cavity; A slot portion 145 which separates the narrow middle portion of the front portion 135 and into which the arch wire 70 is inserted; A waist portion 148 forming side portions of the slot portion and forming a concave portion of the butterfly wing; And round parts 155 positioned at respective corners of the front part 135 and having a round shape. It includes a configuration. The base portion 115 may have various shapes including a rectangular shape, and the front portion 135 may also be configured in various shapes.

Hereinafter, the orthodontic bracket 105 according to the second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The base portion 115 of the bracket 105 according to the second embodiment maintains an aesthetic balance with the body portion 125 by forming a butterfly wing shape, and secures an area sufficiently in contact with the teeth due to its wide cross-sectional area. As it is attached and fixed to the surface of the teeth. Since the front part 135 and the cross-sectional area of the body part 125 have a butterfly wing shape, a waist part 148 having a narrow width is formed in the middle part, and the front part 135 which is connected to the waist part 148. Slot portion 145 is configured in the middle of the). Since the slot portion 145 is cut by the cross-sectional shape of the waist 148, the straight line contacting the arch wire 70 is short, and since the slot portion 145 has a sufficient depth into which the arch wire 70 is inserted, the arch wire ( There is little contact friction or frictional resistance between the 70 and the slot 145. In addition, the cross-section of the base portion 115 may be configured in a rectangular shape, the cross-sectional shape of the body portion 125 may be formed in various shapes, such as petals, jewelry.

The arch wire 70 inserted into the slot 145 is fixed with a ring 80 or a ligation line so as not to be separated. The ring 80 or the ligation line is easily spanned by the inclined surface formed from the end of the butterfly wing shape of the front part 135 to the connection part 165, and the archwire 70 through the narrow portion of the butterfly wing shape. Fix and fasten. This inclined surface can easily release the fastening state of the ring 80 or ligation line.

FIG. 11 shows a state in which the bracket 105 according to the second embodiment of the present invention is fastened to the archwire 70 by a ring 80 or a ligation line, and FIG. 12 is a ring A front perspective view of the bracket 105 and the archwire 70 according to the second embodiment of the present invention by the 80 or the ligation line is shown. The ring 80 is replaced by the ligation line by the type of tooth to which the bracket 105 is fixedly attached. In general, the other side is easy to see the ring (80) and the less visible molar teeth to the ligation line is used.

Bracket 105 according to the second embodiment of the present invention can be variously modified the shape of the front portion 135 and in this case decorate the teeth more beautifully, and the size of the body portion 125 base portion 115 Compared to the relatively small size, the arch wire 70 transmits the force generated in the optimal state to the teeth at the same time to secure a wide distance between the adjacent bracket 105 and the bracket 105 so that foreign substances such as food is not easily caught. There is an advantage such as not to.

In addition, since the rounded portion 155 is rounded at each corner of the front portion 135, the foreign body is not felt by the tongue and the lips, and thus the wearing comfort is soft.

As a result of one experiment, it can be seen that when the orthodontics are corrected using the bracket of the present invention, the number of replacement of the arch wire is reduced, and the time required is reduced from about 6 months to 1 year compared to the prior art.

Referring to Figure 13, when explaining the dimensions of the orthodontic bracket front portion according to an embodiment of the present invention, the vertical straight length of the front portion in the range of 3 to 4mm (mm), the straight line of the widest part horizontally The length is 1.3 to 2.3 mm and the shortest straight length of the waist is comprised in the range of 1.3 to 2 mm.

The front portions 130 and 135 of the orthodontic brackets 100 and 105 are directly in contact with the lips and the tongue, so that the surface area is reduced and the visual aesthetic sense is enhanced while the function of the lever for functional orthodontics is performed. The force must be transmitted at maximum, and as the orthodontic procedure progresses, the bracket fixed to the tooth must move to the position where the force is transmitted without causing friction with the arch wire.

The present invention is the optimum dimension of the bracket front part that satisfies the above conditions by long and repeated experiments and efforts, the vertical straight length of the front part is 3 to 4mm, the straight length of the widest part is 1.3 To 2.3 mm, and the shortest straight length of the waist 148 or the slot 145 or the second slot 143 is configured to be 1.3 to 2 mm.

Therefore, the frictional resistance between the arch wire and the bracket is small, and the elastic force generated by the arch wire is optimally transmitted to the teeth, so that the orthodontic correction can proceed quickly with little force, and the distance between the front and the front of the bracket is maximized. There is an advantage that the foreign matter such as food is not caught well and hygiene and enhance the aesthetics.

Although the present invention has been described as an example, it is not necessarily limited to such an example, and various modifications can be made without departing from the spirit of the present invention. Therefore, one example disclosed in the present invention is not intended to limit the technical spirit of the present invention but to explain, and the scope of the technical spirit of the present invention is not limited by the one example. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

The present invention having the above-described configuration reduces the frictional resistance between the orthodontic bracket and the arch wire, so that the effect of convenience to use is effectively transferred to each tooth for the orthodontic correction and efficiently corrected by less force. have.

In addition, by rounding the corners protruding from the body and the base of the bracket and reducing the relative size of the bracket to eliminate foreign body feelings caused by the tongue and lips, and widening between the bracket and the bracket, foreign matter such as food is not easily caught and hygienic. And it has a convenient effect on use to improve aesthetics.

In addition, as the orthodontics are corrected, the frictional resistance between the bracket and the arch wire due to the displacement of the teeth is small, so that the optimum strength is continuously and efficiently provided, thereby reducing the number of replacement of the arch wire and allowing the orthodontics to be corrected in a short time. There is an industrial use effect that raises the preference and increases production.

Claims (9)

In the bracket for fixing the arch wire by the ring and the ligation line and correct the arrangement of the teeth, A body portion having a first slot portion having a short contact area and a second slot portion into which the ring and the ligation line are inserted, the arch wire being inserted into a central portion, and having a small cross-sectional area and forming a round portion at a protruding edge; A base portion attached to and fixed to the surface of the tooth, the base portion having a wide cross section and forming a round portion at a protruding front edge; And A connection part integrally connecting the base part and the body part and having a groove formed at an entire side thereof to which the ring and the ligation line are inserted and fixed; Orthodontic bracket configured to include. The method of claim 1, wherein the body portion, A front portion contacting the lip in the oral cavity with a long rectangular shape; A first slot portion in which a groove is formed in a middle portion of the front portion and into which the arch wire is inserted; A round part positioned at each corner of the front part and having a round shape; Second slot parts respectively formed on both sides of the first slot part and shortening the length of the first slot part and into which a ring and a ligation line are inserted; Orthodontic bracket configured to include. The method according to claim 1 or 2, The first slot portion is formed in both ends of the second slot portion in a symmetrical structure, the arch wire is inserted and reduces the contact area and contact friction with the arch wire, And the second slot portion is formed at both ends of the first slot portion, respectively, to reduce the linear length of the first slot portion and to be configured on the same plane as the connection portion. The method of claim 1 or claim 2, wherein the body portion, The orthodontic bracket, characterized in that formed to be inclined to meet the connecting portion longer than the length of the base portion. In the bracket for fixing the arch wire by the ring and the ligation line and correct the arrangement of the teeth, A body portion having the arch wire inserted into the center portion and having a slot portion having a short contact area, having a butterfly wing shape, a small cross section, and forming a round portion at a protruding edge; A base part attached to and fixed to the surface of the tooth and having a butterfly wing shape, the base having a wide cross section and forming a rounded part at a protruding front edge; And A connecting portion integrally connecting the body portion and the base portion and having a cross-sectional area of a butterfly wing shape; Orthodontic bracket configured to include. The method of claim 5, wherein Brackets for orthodontics, characterized in that the base portion further comprises a rectangular shape. The method of claim 5, wherein the body portion, A front part having a butterfly wing shape in which the middle part is narrow and contacting the lip part in the oral cavity; A slot portion for separating the concave middle portion of the front portion and inserting the archwire; A waist forming a side of the slot and forming a concave portion of a butterfly wing; And A round part positioned at each corner of the front part and having a round shape; To include, the orthodontic bracket for the orthodontic, characterized in that the end portion of the butterfly wing configuration meets the connecting portion inclined shape. In the bracket for fixing the arch wire by the ring and the ligation line and correct the arrangement of the teeth, The vertical straight length of the bracket front portion is in the range of 3 to 4 mm, The straight length of the widest part in the bracket front portion in the range of 1.3 to 2.3 mm, Orthodontic bracket comprising a configuration in which the straight length of the shortest part in the waist of the front portion of the bracket ranges from 1.3 to 2 mm. The method of claim 8, The waist portion orthodontic bracket, characterized in that the slot portion is included.

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