Low-clearance high-expression orthodontic bracket

Abstract

The utility model discloses a low residual gap high expression orthodontic bracket, include: bracket parent body, groove, lock piece, the groove is set up on bracket parent body for installing bow wire, lock piece is covered on the groove for locking the bow wire installed in the groove, after the lock piece lock, the part of lock piece on the groove is arc face shape, and the bending direction of arc face is perpendicular with the length direction of groove. The utility model discloses a bracket system design, will effectively improve the tooth moving rate, through setting up the elastic arc lock piece, can effectively fix the bow wire of different size in the groove, can effectively improve the precision and stability of bow wire adjustment. Can solve the problem such as torsion axle inclination torque in early fine wire time, and light correction makes the pain feeling of patient reduce, and the lock cover design of arc greatly improves the comfort degree after bracket wearing, and can accurately control the three -dimensional angle of tooth in alveolar bone, is a high -efficient comfortable correction system.

Description

Technical Field

[0001] This utility model relates to the field of orthodontic technology, and more specifically, to an orthodontic bracket with low clearance and high expression. Background Technology

[0002] The history of modern fixed orthodontic technology begins with the Edgewise Appliance invented by Dr. Edward Angle in 1925. Angle's core philosophy emphasized precise three-dimensional control of the teeth, leading him to design revolutionary brackets that laid a solid framework for modern orthodontics. However, limited by the technology of the time, this technique ultimately relied on thick archwires and large orthodontic forces, resulting in painful, inefficient, and unstable treatment outcomes.

[0003] Until the 1950s, Dr. Raymond Begg revolutionized the early "band arch" technique of Angle, proposing the Begg fine wire arch technique. The revolutionary aspect of the Begg technique lies in its core sequence: first allowing the crown to tilt and move, then straightening the root. It uses 0.016-inch Australian wire throughout the procedure, and for the first time systematically implemented the principle of continuous light force, greatly improving treatment efficiency, reducing patient discomfort, and demonstrating the feasibility of differential force tooth movement. However, its significant advantages are accompanied by notable drawbacks: root control in the later stages of treatment is extremely difficult, requiring complex auxiliary springs and demanding a high level of skill from the dentist; it also heavily relies on patient cooperation in wearing intermaxillary traction, and has relatively weak vertical and torque control over the teeth, often leading to loss of anchorage and difficulty in fine occlusal adjustment.

[0004] In pursuit of greater precision and simplicity, Dr. Lawrence F. Andrews introduced the Straight-Wire Appliance orthodontic technique in the late 1970s. Through extensive research on normal occlusion models, he developed the "Six Criteria for Normal Occlusion" and pre-set the ideal tooth position data (including axial tilt and torque) within the brackets. This innovation aimed to guide teeth to their final position simply by inserting a straight archwire into the bracket, greatly simplifying clinical procedures, reducing the demands on the dentist's wire-bending skills, and establishing new standards for orthodontic precision. However, this technique also has inherent limitations: high apical resistance during tooth movement; unnecessary side effects on adjacent teeth when applying torque; and the unavoidable "gap" between the archwire and the bracket slot makes it difficult to accurately express the pre-set angles, often affecting the final therapeutic outcome.

[0005] Dr. Peter Kesling's Tip-Edge differential straight wire orthodontic technique, announced in 1986 and formally published in 1988, successfully integrated the best features of previous techniques. It modified the slot design based on the square wire bracket, allowing teeth to tilt and move freely in the early stages, similar to the Begg technique, efficiently utilizing differential force principles to save anchorage and improve efficiency. In the later stages of treatment, a specially designed square archwire forms a zero-clearance fit with the bracket slot, achieving the preset torque angle with the precision of the straight wire technique, overcoming the inaccuracy of torque control in traditional straight wire techniques. Therefore, the Tip-Edge technique perfectly combines the efficiency of the Begg technique with the precision of the straight wire technique, representing the modern fusion and pinnacle of the thin wire orthodontic concept. However, this technique results in a large appliance size, requiring a double-slot design that increases appliance thickness, reducing patient comfort. Even with a 0.019 x 0.025 inch archwire, a significant clearance angle remains after insertion, reducing expressive efficiency.

[0006] Current fine wire orthodontic techniques primarily rely on tilting to move teeth, which can easily lead to excessive tilting and an inability to effectively control the position of the tooth roots. This results in the need for complex auxiliary devices to straighten the teeth and apply torque later on. The biggest limitation of this orthodontic technique is how to efficiently achieve precise control of the three-dimensional direction of the teeth. Utility Model Content

[0007] To overcome the shortcomings of insufficient precision in the three-dimensional orthodontic control of teeth described in the prior art, this invention provides a low-residue, high-expression orthodontic bracket.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0009] A low-gap, high-expression orthodontic bracket includes: a bracket body, a groove, and a locking piece;

[0010] The groove is formed on the bracket body for installing the bow wire;

[0011] The locking plate covers the groove and is used to lock the bow wire installed in the groove;

[0012] After the locking plate is engaged, the portion of the locking plate on the groove is arc-shaped, and the bending direction of the arc is perpendicular to the length direction of the groove.

[0013] Preferably, the locking piece is an elastic locking piece.

[0014] Preferably, the width of the groove is greater than or equal to the width of the archwire;

[0015] The length from the apex of the locking plate to the bottom of the groove is greater than the height of the bow wire;

[0016] The minimum vertical distance from the arc surface of the locking plate to the bottom of the groove is less than the height of the bow wire.

[0017] Preferably, the minimum vertical distance from the arc surface of the locking plate to the bottom of the groove is less than or equal to half the height of the bowwire.

[0018] Preferably, the bracket body has a locking groove;

[0019] The locking groove is perpendicular to the trench space;

[0020] The lower part of the locking groove intersects with the upper part of the trench and they are interconnected;

[0021] The side wall of the locking groove is provided with a sliding groove;

[0022] The side of the locking piece is provided with a slider that matches the slide groove;

[0023] The locking plate achieves locking on the bracket body by engaging the slider into the slide groove.

[0024] Preferably, the locking groove is a non-through locking groove, with one end of the locking groove penetrating through the bracket body and the other end terminating in the bracket body.

[0025] The locking groove is provided with a vertical positioning hole;

[0026] The positioning hole is equipped with a positioning post;

[0027] The bottom surface of the locking plate is provided with a positioning groove corresponding to the positioning post;

[0028] The height of the positioning post is greater than the height of the positioning hole, but less than the sum of the heights of the positioning hole and the positioning groove.

[0029] When the locking plate is fully locked, the positioning pin is located at the end of the positioning groove away from the arc surface of the locking plate.

[0030] Preferably, the upper arc surface of the locking piece facing the groove is provided with anti-slip texture or longitudinal groove.

[0031] Preferably, each end of the groove is provided with an arc-shaped chamfer.

[0032] Preferably, the arc-shaped chamfers on the groove are symmetrically distributed around the center point of the groove.

[0033] Preferably, the arc-shaped chamfer on the groove is designed with a 40° bevel angle.

[0034] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0035] This invention, through its bracket system design, effectively improves the rate of tooth movement. By placing elastic, arc-shaped locking clips above the grooves, it effectively secures archwires of different sizes within the grooves, significantly improving the accuracy and stability of archwire adjustments. It addresses issues such as torsional axial tilt torque even with finer wires in the early stages. The gentle force of the orthodontic treatment reduces patient pain, and the arc-shaped locking cap design greatly enhances the comfort of wearing the brackets while precisely controlling the three-dimensional angles of the teeth within the alveolar bone. This results in a highly efficient and comfortable orthodontic system. Attached Figure Description

[0036] Figure 1 This is an exploded view of a low-gap, high-expression orthodontic bracket as described in Example 1.

[0037] Figure 2 This is a three-dimensional view of the low clearance, high expression orthodontic bracket described in Example 1 under its usage state.

[0038] Figure 3 This is a side view of a low-gap, high-expression orthodontic bracket as described in Example 1.

[0039] Figure 4 This is a top view of a low-gap, high-expression orthodontic bracket as shown in Example 1.

[0040] Figure 5 for Figure 4 A sectional view of line A-A'.

[0041] Figure 6 This is a 3D view of the locking plate.

[0042] In the figure, 1-bracket body, 2-groove, 3-locking piece, 4-locking groove, 5-sliding groove, 6-slider, 7-positioning hole, 8-positioning post, 9-positioning groove, 10-archwire. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0044] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0045] Example 1

[0046] This embodiment discloses a low-gap, high-expression orthodontic bracket, such as... Figure 1-6 As shown, the low clearance high expression orthodontic bracket includes: bracket body 1, groove 2, and locking piece 3;

[0047] The groove 2 is formed on the bracket body 1 and is used to install the bow wire 10;

[0048] The locking plate 3 covers the groove 2 and is used to lock the bow wire 10 installed in the groove 2;

[0049] After the locking plate 3 is locked, the portion of the locking plate 3 on the groove 2 is arc-shaped, and the bending direction of the arc surface is perpendicular to the length direction of the groove 2.

[0050] It should be noted that in this embodiment, a groove 2 is provided on the bracket body 1 to install the archwire 10, and a locking piece 3 is provided above the groove 2 to fix the archwire in the groove 2.

[0051] In this embodiment, the locking plate 2 is designed with an arc shape to better secure the bowwire 10. The arc-shaped bowwire can better fit the circular bowwire. Figure 2 and Figure 5 The inner wall of the arc-shaped locking plate 3, together with the bottom and side walls of the groove 2, forms a continuous bowwire 10 channel with a cross-section approximately in the shape of a bullet.

[0052] Furthermore, if the bow wire 10 is square, the curved surface of the locking plate 3 has a certain degree of transition. As long as it does not affect the locking of the locking plate 3, various bow wires can be fixed at the curved surface. As long as the height of the bow wire 10 is less than the distance from the top of the curved surface of the locking plate 3 to the bottom of the groove 2, it is acceptable. If a higher bow wire 10 is to be installed in the groove 2, then a bow wire 10 with a smaller width needs to be adapted.

[0053] In this embodiment, the bending direction of the arc surface of the locking piece 3 is perpendicular to the length direction of the groove 2. Assuming that the long side of the groove 2 in the horizontal direction is taken as the axial direction of the groove, then the bending direction of the arc surface of the locking piece 3 is radial bending along the groove 2.

[0054] In this embodiment, the locking piece 3 is an elastic locking piece.

[0055] It should be noted that by setting the elastic locking piece 3, multiple archwires of different sizes can be placed within the groove 2, which can meet the needs of setting different sizes of archwires 10 at different stages during orthodontic treatment. At the same time, the elastic locking piece 3 has a certain degree of elasticity and can adapt to certain deformations, which can improve patient comfort to a certain extent.

[0056] In this embodiment, the bracket body 1 is made of stainless steel, ceramic or composite resin material, and the arc-shaped locking piece 3 is made of shape memory alloy or medical-grade elastic stainless steel.

[0057] In this embodiment, the width of the groove 2 is greater than or equal to the width of the bowwire;

[0058] The length from the apex of the locking plate 3 to the bottom of the groove 2 is greater than the height of the bow wire;

[0059] The minimum vertical distance from the arc surface of the locking plate 3 to the bottom of the groove 2 is less than the height of the bow wire.

[0060] It should be noted that the width of groove 2 is greater than the width of archwire 10, facilitating the placement of archwire 10 within groove 2. The distance from the apex of the locking plate 3 to the bottom of the groove is greater than the height of the archwire, but the distance from the lower part of the locking plate 3's arc surface to the bottom of groove 2 is less than the height of the archwire 10. This ensures that after the archwire 10 is placed within groove 2, the arc surface of locking plate 3 can press against the archwire 10, thus facilitating its fixation. Based on this, archwires 10 of different sizes can be placed within groove 2 in this embodiment, which is beneficial for setting different sizes of archwires 10 at different stages during orthodontic treatment. In addition, locking plate 3 also has a certain degree of elasticity, further facilitating the placement of archwires 10 of different sizes within groove 2.

[0061] In this embodiment, the minimum vertical distance from the arc surface of the locking plate 3 to the bottom of the groove 2 is less than or equal to half the height of the bowwire.

[0062] It should be noted that reducing the distance from the lowest point of the locking plate 3 to the bottom of the groove 2 allows the locking plate to press more firmly against the bow wire within the groove 2. At the same time, it allows full utilization of the elasticity of the locking plate 3 to better hold the bow wire 10 in place.

[0063] It should be noted that a locking groove 4 is provided on the bracket body 1;

[0064] The locking groove 4 is spatially perpendicular to the groove 2;

[0065] The lower part of the locking groove 4 intersects with the upper part of the groove 2 and they are interconnected;

[0066] The side wall of the locking groove 4 is provided with a sliding groove 5;

[0067] The side of the locking piece 3 is provided with a slider 6 that matches the slide groove 5;

[0068] The locking piece 3 locks itself on the bracket body 1 by engaging the slider 6 into the slide groove 5.

[0069] It should be noted that the locking plate 3 described in this embodiment is used to press the bow wire provided in the groove 2. Normally, as long as the locking plate 3 can reliably press the bow wire 10 after the bow wire 10 is installed in the groove 2, the locking plate 3 can be fixed on the bracket body 1. For example, the locking plate 3 can be welded to the bracket body 1, the locking plate 3 can be detachably installed on the bracket body 1, or it can be snapped or hinged to the bracket body 1.

[0070] In this embodiment, a locking groove 4 is provided on the bracket body 1; the locking groove and the groove 2 are arranged in a cross shape. Although they intersect, they are not on the same plane. That is, the intersection point is at the upper end of the groove or the lower end of the locking groove 4. This intersecting part is just used to cover the arc surface of the locking piece 3 on the groove.

[0071] The locking groove 4 and the groove 2 are set vertically, which makes it easier for the arc apex of the locking plate 3 to be aligned with the axis of the groove 2, and can better lock the longitudinal force of the bow wire 10 in the groove 2.

[0072] In this embodiment, a slider 6 is provided on the side of the locking plate 3, and a groove 5 matching the slider 6 is provided on the side wall of the locking groove 4. When the locking plate 3 needs to be locked, the slider 6 can be inserted into the groove 5.

[0073] It should be noted that in this embodiment, both walls of the locking groove 4 are provided with sliding grooves 5, and the two walls of the locking groove 4 are the two vertical surfaces perpendicular to the long side of the groove 2. The two sides of the locking piece 3 that are aligned with the direction of the locking groove 4 are provided with sliders 6, meaning the sliders 6 are positioned perpendicular to the long side of the groove 2.

[0074] In this embodiment, the locking groove 4 is a non-through locking groove, with one end of the locking groove 4 penetrating through the bracket body 1 and the other end terminating inside the bracket body 1.

[0075] The locking groove 4 is provided with a vertical positioning hole 7;

[0076] The positioning hole 7 is provided with a positioning post 8;

[0077] The bottom surface of the locking piece 3 is provided with a positioning groove 9 corresponding to the positioning post 8;

[0078] The height of the positioning post 8 is greater than the height of the positioning hole 7, and less than the sum of the heights of the positioning hole 7 and the positioning groove 9;

[0079] When the locking plate 3 is fully locked, the positioning pin 8 is located at the end of the positioning groove 9 away from the arc surface of the locking plate 3.

[0080] It should be noted that in this embodiment, the locking and positioning of the locking piece 3 is achieved by setting a non-through locking groove 4. One end of the locking groove 4 that passes through the bracket body 1 is used to slide the locking piece into the locking groove 4, that is, to insert the slider 6 into the slide groove 5, and then push the slider 6 completely into place along the slide groove 5. Since the locking groove 4 is non-through, the end that terminates in the bracket body 1 acts as a limit, that is, when the locking piece 3 is pushed to the end of the locking groove 4, the end of the locking groove 4 is not through, and it acts as a blocking and positioning function. In this embodiment, the locking groove 4 spans the groove 2, and the through end and non-through end of the locking groove 4 are on both sides of the groove 2, respectively.

[0081] In this embodiment, a positioning hole 7 is provided in the locking groove 4, and a positioning post 8 is provided in the positioning hole 7. A positioning groove 9 is provided at the bottom of the locking piece 3 to accommodate the sliding top of the positioning post 8. The direction of the positioning groove 9 is consistent with the direction of the locking groove 4. When the locking piece 3 engages the positioning block 6 into the sliding groove 5, the upper end of the positioning post 8 is in the positioning groove 9. When the locking piece 3 is pushed to the fully locked state, the positioning post 8 is exactly at the end of the positioning groove 9. The positioning groove 9 is a non-through positioning groove 9. The end of the positioning groove 9 away from the arc surface of the locking piece 3 is a non-through end, which, in conjunction with the non-through end of the locking groove 4, restricts the position of the locking piece, achieving dual positioning of the locking piece 3. The end of the positioning groove 9 on the arc surface of the locking piece 3 can be either a through end or a non-through end. However, if it is a non-through end, then the upper end of the positioning post 8 must be in the positioning groove 9 when the slider 6 of the locking piece 3 is inserted into the sliding groove 5.

[0082] In this embodiment, the upper surface of the locking piece 3 facing the groove 2 is provided with anti-slip texture or longitudinal groove.

[0083] It should be noted that in this embodiment, anti-slip measures are provided on the inner arc surface of the locking piece 3, that is, the surface of the arc surface facing the groove 2. In this embodiment, anti-slip texture or longitudinal groove is preferably provided, but it is not limited to anti-slip texture or longitudinal groove, as long as it can achieve anti-slip connection within the protection scope of this embodiment.

[0084] In this embodiment, each end of the groove 2 is provided with an arc-shaped chamfer.

[0085] It should be noted that in this embodiment, arc-shaped chamfers are set at both ends of the groove 2, that is, the arc-shaped chamfers are set at the near and far edges of the groove 2, in order to reduce the friction of the archwire 10 during ligation or sliding.

[0086] In this embodiment, the arc-shaped chamfer on the groove 2 is symmetrical about the center point of the groove 2.

[0087] It should be noted that the archwire 10 is sometimes in a straight line during the pulling and adjustment process. By setting the groove 2 and the arc-shaped chamfer to be centrally symmetrical, the two ends of the archwire 10 can be subjected to the action of the arc-shaped chamfer at both ends during use, thereby reducing the friction of the archwire 10 at both ends of the groove.

[0088] In this embodiment, the arc-shaped chamfer on the groove 2 is designed with a 40° bevel angle.

[0089] It should be noted that the 40° bevel angle of the arc-shaped incision effectively reduces archwire damage and optimizes tooth movement. At the same time, the "rounded edge" design eliminates the sharp ends of the brackets, making the contact between the brackets and the mucosa smoother and reducing local friction pressure. In addition, the arc-shaped structure can prevent food debris from accumulating in the "dead corners" at both ends of the groove. Right angles are prone to trapping dirt and grime, indirectly reducing the risk of gingivitis and tooth decay, and improving the patient's oral comfort and health during orthodontic treatment.

[0090] As a specific embodiment, the interface dimensions of the groove 2 are 0.022 × 0.028 inches, that is, the bottom width of the groove is 0.022 inches and the height of the groove wall is 0.028 inches. A locking plate is set above the groove 2. The dimensions of the space enclosed by the main bowwire groove and the arc-shaped locking plate 3 in the vertical height and width directions match the cross-section of the 0.019 × 0.025 inch bowwire, so that the clearance after the bowwire of this specification enters the groove is close to zero.

[0091] When the arc-shaped locking plate 3 is closed, the minimum vertical distance between its inner arc surface and the bottom surface of the main bow wire groove is no more than 0.014 inches, and the width clearance is no more than 0.025 inches, so that the 0.014×0.025 inch bow wire can fit against the bottom of the groove 2 and the inner wall of the locking plate 3.

[0092] This invention utilizes the arc-shaped locking plate 3 and the main groove 2 to form a bullet-shaped archwire channel. The lower bullet-shaped section of the groove 2 is the square part of the bullet. The arc-shaped cross-section of the locking plate 3 forms the arc-shaped head of the bullet. This significantly reduces clearance when archwires of different sizes are inserted into the groove. Especially when using 0.019×0.025 inch archwires, a near-zero clearance tight fit can be achieved, thereby fully and efficiently transmitting torque and tilt control force, and improving orthodontic accuracy.

[0093] Furthermore, even when using a thinner archwire of 0.014 × 0.025 inches in the early stages of treatment, this design still ensures full contact between the archwire and the bottom surface of the groove and the inside of the locking plate, enabling it to play a role in de-rotation, arch leveling, and torque preloading in the early stages, achieving precise movement with light force.

[0094] In summary, this embodiment, through the design of the arc-shaped locking piece 3, forms a bullet-shaped groove 2, allowing the 0.014x0.025 inch archwire to fill the bottom of the groove 2 and the locking piece 3 after insertion. This effectively solves the torsion problem after the 0.014x0.025 inch archwire is used. After the 0.019x0.025 inch archwire is inserted, it fully occupies the bottom of the groove 2, the locking piece 3, and the top and bottom of the bracket body 1, reducing the clearance of the archwire 10 within the bracket body 1. This allows for torque expression and occlusal opening, achieving precise control of the three-dimensional direction of the teeth. In tooth extraction cases, the arc-shaped incision angle design of groove 2 reduces the scratching friction of the wire on the arc surface. At the same time, the incision angle is designed to be 40°, allowing the canine to tilt freely while also allowing controlled tilting movement without deepening the anterior overbite. Through the bullet-shaped groove design and the arc-shaped incision angle design of the canine, the tooth can be controlled with light force in three dimensions.

[0095] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A low-gap, high-expression orthodontic bracket, characterized in that, include: Bracket body (1), groove (2), locking piece (3); The groove (2) is formed on the bracket body (1) for installing the bow wire; The locking plate (3) covers the groove (2) and is used to lock the bow wire installed in the groove (2); After the locking piece (3) is locked, the part of the locking piece (3) on the groove (2) is arc-shaped, and the bending direction of the arc is perpendicular to the length direction of the groove (2); The locking piece (3) is an elastic locking piece; The width of the groove (2) is greater than or equal to the width of the bowwire; The length from the top of the arc of the locking plate (3) to the bottom of the groove (2) is greater than the height of the bow wire; The minimum vertical distance from the arc surface of the locking plate (3) to the bottom of the groove (2) is less than the height of the bow wire.

2. The low-gap, high-expression orthodontic bracket according to claim 1, characterized in that, The minimum vertical distance from the arc surface of the locking plate (3) to the bottom of the groove (2) is less than or equal to half the height of the bow wire.

3. A low-gap, high-expression orthodontic bracket according to claim 1 or 2, characterized in that, The bracket body (1) is provided with a locking groove (4); The locking groove (4) is perpendicular to the groove (2) in space; The lower part of the locking groove (4) intersects with the upper part of the groove (2) and they are interconnected; The side wall of the locking groove (4) is provided with a sliding groove (5) in the same direction as the locking groove (4). The side of the locking piece (3) is provided with a slider (6) that matches the slide groove (5). The locking piece (3) locks itself on the bracket body (1) by inserting the slider (6) into the slide groove (5).

4. The low-gap, high-expression orthodontic bracket according to claim 3, characterized in that, The locking groove (4) is a non-through locking groove. One end of the locking groove (4) passes through the bracket body (1), and the other end terminates in the bracket body (1). The locking groove (4) is provided with a vertical positioning hole (7). The positioning hole (7) is provided with a positioning post (8); The bottom surface of the locking piece (3) is provided with a positioning groove (9) corresponding to the positioning post (8); The height of the positioning post (8) is greater than the height of the positioning hole (7) and less than the sum of the heights of the positioning hole (7) and the positioning groove (9); When the locking piece (3) is fully locked, the positioning pin (8) is located at the end of the positioning groove (9) away from the arc surface of the locking piece (3).

5. The low-gap, high-expression orthodontic bracket according to claim 4, characterized in that, The upper surface of the locking piece (3) facing the groove (2) is provided with anti-slip texture or longitudinal groove.

6. A low-gap, high-expression orthodontic bracket according to claim 1 or 5, characterized in that, Each end of the groove (2) is provided with an arc-shaped chamfer.

7. The low-gap, high-expression orthodontic bracket according to claim 6, characterized in that, The arc-shaped chamfer on the groove (2) is symmetrical about the center point of the groove (2).

8. The low-gap, high-expression orthodontic bracket according to claim 7, characterized in that, The arc-shaped chamfer on the groove (2) is designed with a 40° bevel.

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