KR20190005937A - Bracket for orthodontics - Google Patents

Abstract

The orthodontic bracket includes a bracket slot, at least one bracket slot formed in the bracket body, a bracket base, and three pairs of opposing tie wings. Two first pair of opposing string wings spaced apart from each other are provided at the mesial and distal ends of the bracket body to allow support for resilient straps so as to provide passive ligation of the arch wires engaged in the bracket slots And is defined as inner string wings. A third pair of conflicting strap wings located at the center of the bracket body is defined by outer strap wings and extends further towards the lips / mouth and is raised above the inner strap wings. The lips / mouth sides of the inner strap wings are ligating support means to maintain a space between the resilient strap and the engaged arch wire and form two levels of depth of the bracket slot. The bracket can selectively increase the tooth movement speed and reduce the amount of orthodontic force by selectively controlling the friction relationship between the brackets, the arch wire, and the resilient strap.

Description

Bracket for orthodontics

Dentistry, Orthodontics, Medical engineering, Medicine, Fixing devices and brackets for orthodontics

Orthodontics is a dental practice that specializes in the treatment of malocclusion. In other words, it corrects the misaligned dentition and improper bite pattern of the patient. Conventional orthodontic treatment with fixed devices involves the use of orthodontic brackets, arch wires and ligature instruments. These interconnected elements provide application of force so that misaligned teeth can move in the correct position and orientation during treatment. Small ligation wires or resilient straps (O-rings) are typically used as ligation tools to hold the arch wires to the bracket. However, it is difficult for practitioners to ligate the arch wires over the elastic tie, and overcoming this depends on the experience of the practitioners. Therefore, the use of ligation wire in this context is not mentioned.

The orthodontic bracket includes a body having at least one internal slot for receiving an arch wire and a bracket base for attaching to a patient's tooth. The bracket slot is a lips / mouth opening extending along the body of the bracket in the mesio-distal direction. The bracket slot is defined by two parallel side walls and one bottom. The bracket base is typically a pad that connects the lower side of the bracket body. The bracket base is contoured to match the lips / mouth side of the tooth. The orthodontic bracket is attached directly to the face of the tooth through the bracket base with the aid of attachment materials. The mounting surface of the bracket base is specially designed or treated to increase the retention of adhered material.

The bracket wings or strap blades typically extend outward from the bracket body and may be perpendicular to the mesio-distal direction of the bracket slot when viewed from the lips / mouth side. The orthodontic bracket has at least a pair of conflicting strap wings extending occlusally and gingivally. Once the arch wire is inserted into the bracket slot, a ligation mechanism, such as a resilient strap, surrounds the bracket body, the bottom of the strap wings and the top of the arch wire to ensure that the arch wire is held in the bracket slot. Most brackets used in orthodontic treatment are typically twin brackets with two pairs of opposing string wings spaced from each other. A pair of strap wings is located at the mesial end of the bracket body and the other pair of strap wings are located at the distal end of the bracket body.

The arch wire is a curved metal wire and serves as an ideal specimen to guide teeth to be properly aligned as well as a means for providing a corrective force to move the teeth during treatment. The arch wires have different cross-sectional structures to provide different degrees of orthogonality at each step of the treatment. For example, arch wire of round cross section provides high flexibility and light proofing power, and is often used in the early stages of treatment. On the other hand, arcuate sections of archwires are used to overload and are used in the final stage to control torque, have low flexibility and greater corrective force.

Once the orthodontic treatment procedure is initiated, the orthodontic bracket locates the center of the clinical crown or is placed directly on the individual tooth surface, regardless of the incisor edge technique. Once the placement of the braces for the orthodontic braces is complete, the arch wire is inserted and the brackets are securely engaged by the resilient strap. The position of the bracket on the misaligned tooth causes the engaged arch wire to change its shape. The restoring force provided by the archwire so as to restore the initial arch shape provides the corrective force to move the slave to the proper alignment.

In order to allow movement of the teeth, relative movement between the brackets and the interdigitated arch wires is essential with respect to the corrective force provided by the arch wires. It is recognized that the frictional engagement between brackets, arch wires and resilient straps affects the outcome of each treatment step. For example, it is desirable to reduce the frictional relationship between the brackets, the arch wire and the resilient straps by allowing the free sliding of the engaged arch wire in the bracket slot so that the tooth movement and spatial occlusion of the body in the leveling and aligning steps is possible Do. Reduced friction increases the rate of tooth movement and reduces the amount of orthodontic force required to move the teeth, thereby shortening the duration of treatment and providing more comfort to the patient. If the engaged arch wire can not slip freely in the bracket slot, the treatment outcome and duration of treatment are unpredictable. Conversely, in the final step, the arch wire must be securely seated in the bracket slot, as friction is required to maintain the position of the teeth when maximizing accurate torque correction.

In the usual case of using twin brackets, the resilient strap will stretch the resilient strap so that the arch wire surrounds the bracket body so that the arch wire can securely fit within the slot of the bracket, And is ligated. In this configuration, the resilient strap pushes the arch wire securely downwardly toward the bottom side of the bracket slot, thereby increasing the frictional relationship between the brackets, the arch wire and the resilient straps. This structure prevents the engaged arch wire from sliding freely within the bracket slot. Thus, desirable tooth movement is difficult to achieve, leading to unpredictable results such as labial tipping or proclination of the anterior teeth during the leveling and alignment steps.

The present invention provides an improved orthodontic bracket capable of overcoming the above-mentioned problems and disadvantages associated with the frictional relationship between brackets, arch wires and resilient straps in the above-described twin brackets for orthodontics.

The present invention is directed to an improved orthodontic bracket that allows the practitioner to selectively control the frictional engagement between brackets, arch wires, and elastic ties. The practitioner must maintain the position of the tooth to allow for free sliding within the bracket slot in response to the force of the arch wire defined as passive ligation or to maximize the precise torque correction defined as active ligation You can choose to keep the wired wire firmly in the bracket slot.

To provide this functionality, the present invention provides a bracket for orthodontics having at least one slot for receiving an arch wire and a bracket base for attaching to a patient's teeth. The bracket contains three pairs of conflicting strap wings. Each string wing extends outward from the bracket body and its direction is perpendicular to the mesio-distal direction of the bracket slot when viewed from the lips / mouth side. The first and second conflicting strap wings spaced apart from each other are located at the mesial end and distal end of the bracket body, which are each defined as inner strap wings. A pair of inner strap blades located at the mesial end of the bracket body are defined as mesial pairs of inner strap blades. A pair of inner strap blades located at the distal end of the bracket body is defined as a distal pair of inner strap blades. The third pair of conflicting strap wings are located at the central portion of the bracket body that extends further towards the lips / mouth and such a pair of conflicting strap wings are disposed on the upper and lower ends of the inner and outer strap wings, Raised and defined by outer strap wings. In this embodiment, a portion of the lips / mouth sides of the inner strap wings is used to hold a space between the resilient strap and the engaged arch wire and to prevent the resilient strap from being pushed downward into the bottom of the bracket slot It becomes a means of ligature support. The width of the outer strap wings when viewed from the lips / mouth side is greater than the mutual distance between the pair of inner strap blades and the pair of distal ends of the inner strap blades, so that the auxiliary slot has two pairs of inner strap wings and & .

The present invention can employ the following method.

In one application, the resilient tie engages only the outer strap wings of the bracket with the arch wire engaged thereto. Because the outer strap wings are located at the center of the bracket body and are raised above the pair of inner strap blades and the inner strap blades, a portion of the resilient tie fits under the outer strap blades and the remainder of the outer strap blades Located at the anchor / distal sidewall. The resilient tie portion located at the muzzle / distal sidewalls of the adjacent outer strap blades is also placed on the lips / mouth sides of the inner strap wings and traverses the lip / mouth side opening of the bracket slot. In such a construction, the resilient tie is supported by the lips / mouth sides of the inner strap wings, and the space between the resilient tie and the engaged arch wire is maintained, so that the frictional relationship between the bracket, the arch wire and the resilient tie Is reduced. As a result, a small arch wire having a width smaller than the width of the bracket slot can freely slide within the bracket slot.

In another application, a resilient tie engages a pair of inner and outer strap blades of a bracket having an arch wire engaged thereto. A portion of the resilient tie is sandwiched between a pair of inner threads of the string wings and a pair of inner string wings and the remainder is located on the inner thread side walls of the inner string wings and the end pair sidewalls of the inner string wings. A resilient tie portion located at the midsection / distal sidewalls of adjacent inner strap blades rests on the top of the engaged arch wire and reliably presses down the arch wire engaged to the bottom side of the bracket slot. Because there is no space between the resilient tie and the engaged arch wire in such a structure, the amount of frictional engagement between the bracket, the arch wire, and the resilient tie is high. As a result, the engaged arch wire can maximize deformation, thus maximizing the corrective force. For the arch wire of a right-angled section, it produces maximum corrective force because it can control the torque and the corners of the teeth without movement of the teeth along the arch wire.

When the teeth are severely rotated, the resilient strap is brought into engagement with the outer strap wings of the bracket, together with the distal pair of inner strap wings or a pair of inner strap wings of the bracket having an arch wire engaged thereto to provide non- It can be bitten. In this structure, a portion of the resilient strap is fitted under the inner strap wings that engage with the outer strap wings and outer strap wings. Some of the remaining portions of the resilient strap are located on the side walls of adjacent inner strap wings that engage with outer strap wings. It is placed on top of the engaged arch wire and reliably presses the engaged arch wire downward into the bottom side of the bracket slot. The remainder of the remainder of the resilient strap is located on the opposite sidewall of the adjacent outer strap wings and is not engaged with the outer strap wings and extends from the lips / mouth sides of the inner strap wings across the mouth / mouth opening of the bracket slot . The space between the portion of the resilient tie and the engaged arch wire is maintained. Thus, the corrective force is induced only on the inner strap wings that engage with the outer strap wings, which causes non-rotational movement relative to the long axis of the tooth.

In another aspect of this bracket embodiment, the outer strap wings located at the center of the bracket body extend to the lips / mouth side and are raised above the inner strap wings, resulting in having two levels of bracket slot depth. The first bracket slot depth is defined by the height of the side walls of the bracket slot located between the opposing string blades, which are a pair of inner thread wings or a pair of inner string wings. It is measured from the bottom of the bracket slot to the edge connecting the lips / mouth sides of the mesial pair of inner strap wings or from the bottom of the bracket slot to the edge connecting the lips / mouth sides of the distal pair of inner strap wings . The edges connecting the lips / mouth sides of the meshing pairs of inner string wings or the edges connecting the lip / mouth sides of the distal pairs of inner string wings are located at approximately the same level. The depth of the second bracket slot is defined by the height of the sidewall center portion of the bracket slot located between the opposing strap blades, which are outer strap blades. It is measured from the bottom of the bracket slot to the edge connecting the lips / mouth sides of the outer strap wings. Compared to conventional twin brackets, this bracket embodiment is generally thicker and has a larger slot depth to allow placement of a second arch wire overlying the first arch wire. This overlaying technique is used to move the teeth more effectively in some treatment situations.

The outer strap wings, which are located at the center of the bracket body and extend further to the lips / mouth side and are placed on the inner strap wings, are used for elastic connection of the upper inside of the upper jaw so as to induce additional tooth- Can be employed as a post. In this structure, the rubber band inside the upper jaw is supported by the lips / mouth sides of the inner strap wings, and the space between the rubber band inside the upper jaw and the engaged arch wire is maintained. As a result, the connected tooth can freely slide along the engaged arch wire.

In addition, auxiliary slots formed between the two pairs of inner strap wings and the bottoms of the outer strap blades are designed to allow the application of orthodontic force closer to the center of resistance of the teeth for more effective tooth movement, It is used for the installation of ancillary equipment such as a Kobayashi's hook.

In another embodiment of the present invention, the mesio-distal width of the outer strap wings when viewed from the lips / mouth side is defined as the mesio-distal width between the mesial pair of inner strap wings and the distal pair of inner strap wings mesio-distal distance. The auxiliary slots located between the two pairs of inner strap wings and the bottom of the outer strap wings can be adjusted to have different cross sections or can be completely excluded from the bracket embodiment.

Other brackets embodying the present invention optionally have an integral portion extending from one of the wings to the gingival / occlusal side and perpendicular to the mesio-distal direction of the bracket slot when viewed from the lips / mouth side. The end of the extended portion of the gum / occlusion is preferably a mushroom head or hook to accommodate tracking devices (e.g., rubber band, C-chain, coil spring, etc.). The integrally extending portion preferably includes a flexible material that can be bent for soft tissue removal or patient comfort.

In a modified embodiment embodying the invention, the outer strap wings and inner strap wings with respect to the mesio-distal direction of the bracket slot as viewed from the lip / mouth side are also selectively extended outwardly at an acute angle from the bracket body . This acute angle corresponds to the preferred angular orientation of the clinical crown in relation to the occlusal plan in normal occlusion, which is the central axis of the occlusal-to-gingival side of the clinical crown. Optionally, the integral portion, preferably the mushroom head or hook, extending from any one of the biased strap wings to the lipside / mouth side is formed at an acute angle to the mesio-distal direction of the bracket slot and parallel to the axis of the biased string wing .

1 is a perspective view of a bracket for orthodontics embodying the present invention.
2 is another perspective view of the bracket for orthodontic treatment of Fig. 1;
Fig. 3 is a side view of the bracket for orthodontic treatment of Fig. 1 as seen from the mesial-distal end.
Fig. 4 is a plan view of the bracket for orthodontics of Fig. 1 as viewed from the occlusal-gingivally side.
Fig. 5 is another perspective view of the bracket for orthodontic treatment of Fig. 1, in which a circular cross-sectional arch wire engaged with it is ligated by a resilient strap in an outer strap wing;
6 is a side view of the bracket for orthodontic treatment of Fig. 5 as seen from the mesial-distal end.
Fig. 7 is another perspective view of the orthodontic bracket of Fig. 1, in which a circular cross-sectional arched wire engaged with it is ligated by a resilient strap in an inner strap wing;
Fig. 8 is a side view of the bracket for orthodontic treatment of Fig. 7 as seen from the mesial-distal end.
Figure 9 is another perspective view of the bracket for orthodontic treatment of Figure 1, in which a circular cross-sectional arch wire engaged with it is ligated by a resilient strap in an outer strap wing with a pair of inner strap wings.
10 is a plan view of the bracket for orthodontics of Fig. 9 as viewed from the occlusal-gingivally side.
11 is a front view of another orthodontic bracket embodying the present invention having a portion extending from the side of the inner cord to the side of the gingival / occlusal side when viewed from the labio / bucco-liga.
FIG. 12 is a front view of another bracket for orthodontic appliances embodying the present invention having a portion extending from one outer strap wing to the side of the gingiva / occlusion as viewed from the labio / bucco-liga.
Fig. 13 is a front view of another bracket for orthodontic appliances embodying the present invention having an acute angle side-gum side center shaft when viewed from the lips side / mouth side, viewed from the lips side / mouth side.
14 is a cross-sectional view of another tooth embodying the present invention having a mesio-distal width of outer strap blades smaller than the mutual distance between the pair of meshes of the inner strap wings and the pair of distal ends of the inner strap wings when viewed from the lips / Fig. 2 is a front view of the orthodontic bracket. Fig.
15 is another perspective view of the bracket for orthodontic treatment of Fig. 14 without auxiliary slots. And,
Fig. 16 is another perspective view of the bracket for orthodontics of Fig. 14 without auxiliary slots.

1 and 2 are perspective views of a bracket 100 for orthodontics embodying the present invention. The bracket 100 includes a bracket body 7 having at least one built-in slot 3 for receiving an arch wire. The bracket slot is an opening in the lips / mouth that extends along the body of the bracket in the mesio-distal direction 4. The bracket slot is defined by two parallel side walls and one bottom The bracket base 5 is generally connected to the lower side of the bracket body 5. The bracket base 5 is contoured to match the lip / mouth surface of the teeth. Three pairs of opposing tie wings that engage teeth from the body and extend into the occlusal and gingival sides and whose direction is defined by the mesial-distal end of the bracket slot 3 when viewed from the lips / Are perpendicular to the direction 4. The first and second pairs of conflicting strap blades spaced apart from each other are located at the mesial end and the distal end of the bracket body defined as the inner strap blades 2 dog A pair of inner strap wings disposed at the distal end of the bracket body are defined as a pair of inner strap wings disposed at the distal end of the bracket body, The third pair of conflicting strap wings are arranged in the central part of the bracket body which extends further towards the lips / mouths and ascend to the upper part of the pair of cores and ends of the conflicting straps, and the outer strap wings 1, The mouth side / mouth side surfaces 25 of the inner strap blades are designed so that a resilient strap can press the arch wire downward to prevent it from being inserted into the bottom surface of the bracket slot 3. In this embodiment, Which is a ligating support means for maintaining the space between the strap and the interdigitated arch wire. The outer strap wings are raised to the top of the inner strap wings The bracket consists of a bracket slot depth of two levels: the auxiliary slot (6) is formed between the bottom of the two pairs of inner and outer straps of strap wings wings to be used for the installation of auxiliary equipment.

3 is a side view of the bracket 100 for orthodontic braces viewed from the mesial-distal direction, showing two different depths of the bracket slot. The first bracket slot depth is defined by the height of the sidewall 31 of the bracket slot located between opposing strap blades, which are a pair of inner strap blades, or between the distal pair (2) of inner strap blades. The depth of the second bracket slot is defined by the height of the middle portion of the side wall 32 of the bracket slot disposed between the opposing strap blades, which are the outer strap blades 1.

Figure 4 is a plan view of the orthodontic bracket viewed from the occluso-gingivally, showing the position of the outer strap wings mounted on the inner strap wings and between the two pairs of inner strap wings, The position of the auxiliary slot 6 formed between the upper portions of the bracket base 5 is again shown.

5 and 6 are a perspective view and a side view of a bracket 100 for orthodontics embodying the present invention having a circular cross-sectional arch wire 80 engaged therewith. The resilient strap (60) engages only the outer strap wings (1) of the bracket. In such a construction, a portion of the resilient strap is sandwiched beneath the outer end wings and the remainder is positioned on the meso / distal side walls of the neighboring outer strap wings. A portion of the resilient strap located at the anchor / distal sidewall of the adjacent outer strap blades also rests on the lips / mouth sides 25 of the inner strap blades and traverses the lips / mouth side opening of the bracket slot. The resilient strap 60 is supported by the lips / mouth sides 25 of the inner strap wings 2 and the space 70 between the resilient strap and the engaged arch wires 80 is maintained. A small arch wire having a width narrower than the width of the bracket slot can freely slide within the bracket slot.

7 and 8 are a perspective view and a side view of a bracket 100 for orthodontics embodying the present invention having a circular cross-sectional arch wire 80 engaged therewith. The resilient strap (60) engages only the inner strap wings (10) of the bracket. In this configuration, a portion of the resilient strap is sandwiched between a pair of cores of the inner strap blades 2 and a pair of ends of the inner strap blades 2, and the remainder of the inner strap blades, And are located at the terminal sidewalls of the terminal pair, which are string wings. A portion of the resilient strap located at the midsection / distal side walls of adjacent inner strap blades overlaps the engaged arch wire 80 and reliably presses down the arch wire 80 engaged to the bottom 34 side of the bracket slot 3 do. In this configuration, the amount of friction between the bracket, the arch wire, and the resilient strap is large because there is no space between the resilient strap 60 and the engaged arch wire 80.

9 and 10 are a perspective view and a side view of a bracket 100 for orthodontics embodying the present invention having a circular cross-sectional arch wire 80 engaged therewith. The resilient strap 60 engages the outer strap wings 1 of the bracket with a pair of inner strap wings 2 of this bracket to provide a non-rotational movement. In this configuration, A portion of the strap is fitted under the inner strap wings 2 that engage with the outer strap wings 1 and the outer strap wings 1. Some of the remaining portions of the strap are resiliently attached to the outer strap wings 1 10 to cover the engaged arch wire 80 and securely press the engaged arch wire 80 downwardly toward the bottom side of the bracket slot 10. The resilient strap 2 The other part of the remainder of the outer strap wings 1 is located on the opposing sidewall of the adjacent outer strap wings 1 and does not engage the outer strap wings 1 and does not engage the lip / 25). The space between the arch wire 80 engaged with this portion of the strap 60 is maintained so that the orthodontic force is induced only on the inner strap wings that engage with the outer strap wings so that the rotational movement about the long axis of the tooth prevent.

11 is a front view of the other teeth correcting bracket embodying the present invention having a portion 70 integrally extended to the side of the gingiva / the occlusal side in any one of the inner band blades 2 from the lips side / mouth side . The extended portion is perpendicular to the mesio-distal direction of the bracket slot. The end 71 of the portion extending to the gum side / occlusal side is preferably a mushroom head or hook so as to accommodate the tracking devices. The portion 70 integrally extended to one of the inner string blades 2 can preferably be bent for soft tissue clearance or patient comfort.

12 is a front view of another tooth bracket for embodying the present invention having a portion 70 extending to the gingival side / occlusal side integrally with one of the outer strap blades 1 from the lips side / mouth side. The extended portion is perpendicular to the mesio-distal direction of the bracket slot. The end 71 of the portion extending to the gum side / occlusal side is preferably a mushroom head or hook so as to accommodate the tracking devices. The portion 70 integrally extended to one of the outer strap blades 1 can preferably be bent for soft tissue clearance or patient comfort.

13 is a front view of another bracket for orthodontic treatment according to the present invention, viewed from the lips side / mouth side. The outer strap wings 1 and inner strap wings 2 extend outwardly from the bracket body at an acute angle with respect to the mesio-distal direction 4 of the bracket slot when viewed from the lips / mouth side. This acute angle corresponds to the preferred angular portion of the clinical side of the clinical crown on the occlusal-gingival axis in relation to the occlusal plan in normal occlusion.

FIG. 14 is a front view of another bracket for orthodontic treatment according to the present invention, viewed from the lips side / mouth side. In such a configuration, the mesio-distal width of the outer strap wings 1 when viewed from the lips / mouth direction is smaller than the mesio-distal distance between the meshing pairs of the inner strap wings and the distal pairs of inner strap wings .

15 is a perspective view of an alternative orthodontic bracket embodying the present invention illustrated in FIG. In this configuration, the mesio-distal width of the outer strap wings (1) is greater than the mesial-distal width of the inner strap wings (2) and the distal pairs of inner strap wings (2) when viewed from the lips / Are smaller than the mesial-distal mutual distances between them. The auxiliary slot is entirely excluded from the bracket embodiment 100.

Figure 16 is a perspective view of an alternative orthodontic bracket embodying the present invention shown in Figure 14; In this configuration, the mesio-distal width of the outer strap wings (1) is greater than the mesial-distal width of the inner strap wings (2) and the distal pairs of inner strap wings (2) when viewed from the lips / Are smaller than the mesial-distal mutual distances between them. An auxiliary slot 6 with a modified cross section is located between the two pairs of inner string wings 2 and the outer string wings 1 of the bracket embodiment.

Claims (2)

Bracket body;
At least one built-in bracket slot formed in said bracket body to receive an arch wire therein;
The bracket slot having an opening on the lips / mouth side, extending in a mesio-distal direction along the bracket body, defined by two parallel side walls and a bottom,
A bracket base connected under the bracket body;
A bracket body extending axially and gingivally from the bracket body and positioned at the mesial end of the bracket body and defined by a pair of meshes of inner strap wings and having a passive ligation A pair of conflicting strap wings comprising lips side / mouth side surfaces of a mesial pair of inner strap wings to allow support for a resilient strap to provide a resilient strap;
The brackets extending in an occlusally and gingivally manner from the bracket body and positioned at the distal end of the bracket body and defined as a distal pair of inner string wings and having a passive ligation of the arch wire engaged in the bracket slot A second pair of opposing strap wings including lipside / mouth side surfaces to a distal pair of inner strap wings that allow support for a resilient strap to be provided; And
A bracket body extending in an occlusally and gingivally manner from the bracket body and located at a central portion of the bracket body extending further toward the lip / mouth and having a pair of inner and outer strap wings, A third pair of conflicting strap wings lifted upwards and defined as outer strap wings and forming a second level of slot depth of the bracket slot,
Wherein the mesio-distal width of the outer strap blades is relatively greater than the mesio-distal mutual distance between the mesial pair of inner strap blades and the distal pair of inner strap blades. Bracket body;
At least one built-in bracket slot formed in said bracket body to receive an arch wire therein;
The bracket slot having an opening on the lips / mouth side, extending in a mesio-distal direction along the bracket body, defined by two parallel side walls and a bottom,
A bracket base connected under the bracket body;
A bracket body extending axially and gingivally from the bracket body and positioned at the mesial end of the bracket body and defined by a pair of meshes of inner strap wings and having a passive ligation A pair of conflicting strap wings comprising lips side / mouth side surfaces of a mesial pair of inner strap wings to allow support for a resilient strap to provide a resilient strap;
The brackets extending in an occlusally and gingivally manner from the bracket body and positioned at the distal end of the bracket body and defined as a distal pair of inner string wings and having a passive ligation of the arch wire engaged in the bracket slot A second pair of opposing strap wings including lipside / mouth side surfaces to a distal pair of inner strap wings that allow support for a resilient strap to be provided; And
A bracket body extending in an occlusally and gingivally manner from the bracket body and located at a central portion of the bracket body extending further toward the lip / mouth and having a pair of inner and outer strap wings, A third pair of conflicting strap wings lifted upwards and defined as outer strap wings and forming a second level of slot depth of the bracket slot,
Wherein the mesio-distal width of the outer strap blades is equal to the mesio-distal distance between the mesial pair of inner strap blades and the distal pair of inner strap blades.

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