Orthodontic bracket

Abstract

The utility model provides an orthodontic bracket which comprises a bottom plate, a fixing block is arranged on the bottom plate, the fixing block comprises an upper wing and a lower wing, an arch wire groove is formed in a gap between the upper wing and the lower wing, a boss is arranged on the vertical face, away from the bottom plate, of the upper wing, and a first groove is formed in the vertical face, away from the bottom plate, of the boss. A limiting protruding block is arranged on the vertical inner wall, close to the bottom plate, of the first groove and divides the first groove into two containing grooves, a lock cover is assembled on the outer side of the boss in a sliding mode, a mounting groove is formed in the vertical face, perpendicular to the bottom plate, of the lock cover, a shaft wire penetrates through the mounting groove, and the outer wall of the shaft wire abuts against the outer wall of the limiting protruding block. The position of the lock cover is adjusted by the fact that the shaft wire deforms under external force to cross the limiting protruding block, the lock cover is restored to the original position through the shape memory effect under the oral cavity temperature, the lock cover is locked in the containing groove, the dynamic load resisting capacity is improved, and the lock cover is prevented from being disengaged.

Description

Technical Field

[0001] This utility model relates to the field of dental bracket technology, specifically to an orthodontic bracket. Background Technology

[0002] Brackets are an important component of fixed orthodontic technology. They are directly bonded to the surface of the tooth crown with adhesive. The archwire applies various types of orthodontic forces to the teeth through the brackets. Brackets are made of stainless steel, bioceramics, or composite resin. Their main function is to fix the archwire, so that the archwire can play a better role in transmitting orthodontic forces, thereby controlling the three-dimensional movement of the teeth and achieving the purpose of orthodontic treatment.

[0003] In existing technologies, self-ligating brackets use sliding locking covers instead of traditional ligation (using rubber rings or ligature wires), which significantly reduces the frictional resistance between the archwire and the bracket, achieving light-force orthodontic treatment and improving patient comfort.

[0004] However, current self-ligating bracket lock covers generally adopt a simple slide rail locking structure. This design has significant drawbacks when subjected to dynamic loads generated by chewing forces over a long period of time: the alternating shear force generated during chewing will form stress concentration along the slide rail contact surface. When the stress exceeds the critical value of the locking structure (i.e., the lock cover will move up and down due to frequent friction during chewing), the lock cover is prone to accidental dislodgement. If the lock cover dislodges, it will not only lead to the interruption of orthodontic force transmission and prolong the treatment process, but in severe cases, it may even cause tooth displacement and relapse due to loss of continuous control, affecting the stability of the orthodontic effect. Utility Model Content

[0005] In view of this, the present invention provides an orthodontic bracket that can adjust its position by deforming the shaft wire under external force to cross the limiting protrusion, and restore its original position through shape memory effect at oral temperature, locking it in the placement slot, thereby improving its resistance to dynamic loads and preventing the bracket from falling out.

[0006] To solve the above-mentioned technical problems, this utility model provides an orthodontic bracket, including a base plate, a fixing block provided on the base plate, the fixing block including an upper wing and a lower wing, the gap between the upper wing and the lower wing forming an archwire groove, the archwire groove being used to place the archwire.

[0007] A boss is provided on the vertical surface of the upper wing away from the bottom plate, and a first groove is provided on the vertical surface of the boss away from the bottom plate. The first groove can be integrally formed with the boss by casting a mold during manufacturing.

[0008] A limiting protrusion is provided on the vertical inner wall of the first groove near the bottom plate. The limiting protrusion divides the first groove into two placement slots. The two placement slots are located on both sides of the limiting protrusion and are symmetrically arranged on both sides of the limiting protrusion. The two placement slots and the limiting protrusion are arranged linearly in the vertical direction.

[0009] A locking cover is slidably mounted on the outer side of the boss. Sliding grooves are symmetrically opened on the vertical outer walls on both sides of the first groove. A slide rail is set on the side of the locking cover facing the bottom plate and corresponding to the two sliding grooves. The sliding groove on the locking cover is adapted to the slide rail on the first groove (that is, it is assembled by clearance fit). The locking cover is slidably connected in the sliding groove through the slide rail.

[0010] The lock cover is located on the side of the boss away from the base plate. The lock cover has a mounting groove on a vertical surface perpendicular to the base plate (i.e., the mounting groove is set on a vertical surface on one side of the lock cover). The lock cover also has a through hole, with plugs at both ends of the through hole. The mounting groove is formed between the two plugs. A shaft thread passes through the mounting groove. The outer wall of the shaft thread abuts against the outer wall of the limiting boss, and the outer wall of the shaft thread abuts against the inner wall of the mounting groove, so that the shaft thread is horizontally set in the two placement grooves.

[0011] The two ends of the shaft are fixedly connected to the opposing surfaces of two plugs. The plugs are used to limit the movement of the shaft and prevent it from deviating during movement.

[0012] The outer wall of the locking cover has a raised structure coaxial with the mounting groove. This raised structure extends away from the base plate to make way for the deformed shaft, making it easier for the shaft to cross the limiting protrusion, further improving the adjustment speed of the locking cover and reducing the adjustment time of the shaft.

[0013] The shaft wire is made of a deformable material, which allows the shaft wire to deform under the action of external force, so that its position can be adjusted in the two placement slots in the first groove.

[0014] The shaft wire is made of nickel-titanium alloy, which makes it easy for it to return to its original shape under the influence of oral cavity temperature after deformation.

[0015] The shaft wire is designed as a cylindrical structure, which allows the load to be distributed through the arc surface of the shaft wire, thus preventing the lock cover from accidentally coming off due to local breakage of the shaft wire.

[0016] The boss, the first groove, and the limiting protrusion are all designed with a rectangular structure, which makes it easier to cooperate with the outer wall of the shaft wire to improve the limiting effect on the shaft wire, further improve the adjustment rate of the shaft wire and reduce the adjustment time of the shaft wire.

[0017] A second groove is provided on the top surface of the lower wing near the edge of the lock cover. The second groove and the lock cover form an operating groove, which is used to place a lock-picking tool to open the lock cover, so that the lock cover can be opened quickly.

[0018] A first protrusion is provided on the vertical surface of one end of the lock cover near the lower wing, and a second protrusion is provided on the vertical surface of the lower wing. The first protrusion and the second protrusion form a force fulcrum, which improves the stability and safety of the unlocking operation and prevents the lock cover from deforming due to improper force.

[0019] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0020] 1. Improve the locking stability of the locking cap and prevent accidental dislodgement: The shaft wire is made of deformable materials such as nickel-titanium alloy. Under the action of external force, it deforms and crosses the limiting protrusion. Its position can be adjusted in the two placement slots of the first groove. When the shaft wire returns to its original position (such as by shape memory effect at oral temperature), the limiting protrusion locks it in the target placement slot, forming a stable locking structure. This significantly improves the locking cap's ability to resist dynamic loads such as chewing force, avoids the locking cap from dislodgement caused by alternating shear force, ensures continuous and stable transmission of orthodontic force, and prevents interruption of treatment or relapse of tooth displacement.

[0021] 2. Improve the stability of the shaft wire: The shaft wire adopts a cylindrical structure, which evenly distributes the load through the arc surface, avoiding shaft wire breakage caused by local stress concentration, and further enhancing the reliability of the lock cover locking.

[0022] 3. Adaptive stability achieved by utilizing the properties of shape memory alloys: The shaft wire is made of nickel-titanium alloy, which deforms under external force at room temperature (such as when a doctor operates a lock-picking tool), making it easy to adjust the position of the lock cover; after being implanted in the oral cavity, it returns to its original shape under the action of body temperature, and can maintain the locked state without additional external force, ensuring that the lock cover is stable and reliable in long-term use and reducing the frequency of manual intervention.

[0023] 4. Reduce friction damage and extend component life: The boss, first groove and limiting boss adopt a rectangular structure, which forms a tight fit between the plane and the curved surface with the cylindrical shaft wire, reducing the lateral displacement of the shaft wire; the raised structure of the locking cover provides clearance space for the deformable shaft wire, reduces friction loss, extends the overall service life of the bracket, and avoids performance degradation caused by component wear.

[0024] 5. Ensure archwire stability and improve treatment results: The locking of the archwire in the placement slot and the cooperation of the archwire groove form a double limit on the archwire, ensuring that the archwire maintains a stable position during treatment and avoiding displacement or dislodgement. This improves the efficiency of orthodontic force transmission and optimizes the stability of orthodontic treatment results. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the partial parts of the lock cover of this utility model.

[0027] Figure 3 This is a schematic diagram of a partial component structure of this utility model;

[0028] Figure 4 This is a schematic diagram of the lock cover and its components of this utility model.

[0029] In the diagram: 101, base plate; 102, fixing block; 103, upper wing; 104, lower wing; 105, boss; 106, first groove; 107, limiting protrusion; 108, lock cover; 109, shaft screw; 110, through hole; 111, bow wire groove;

[0030] 201. Protruding structure;

[0031] 301, First protrusion; 302, Second protrusion; 303, Operating groove;

[0032] 401. Slide groove; 402. Slide rail. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-4 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0034] A type of orthodontic bracket, such as Figure 1 , 2 As shown: It includes a base plate 101, on which a fixing block 102 is provided. The fixing block 102 includes an upper wing 103 and a lower wing 104. The gap between the upper wing 103 and the lower wing 104 forms an archwire groove 111. The archwire groove 111 is used to place the archwire, so that the archwire is placed in the archwire groove 111 to limit the archwire and ensure that the archwire maintains a stable position during the orthodontic treatment and avoids displacement.

[0035] A boss 105 is provided on the vertical surface of the upper wing 103 away from the bottom plate 101. A first groove 106 is provided on the vertical surface of the boss 105 away from the bottom plate 101. The first groove 106 can be integrally formed with the boss 105 by casting a mold during manufacturing, thereby improving the stability of the structure and preventing excessive wear or jamming when the object moves in the first groove 106.

[0036] like Figure 1 , 2 As shown in Figure 4: A limiting protrusion 107 is provided on the vertical inner wall of the first groove 106 near the base plate 101. The limiting protrusion 107 divides the first groove 106 into two placement slots. The two placement slots are located on both sides of the limiting protrusion 107. The optimal position of the two placement slots is that they are symmetrically arranged on both sides of the limiting protrusion 107, and the two placement slots and the limiting protrusion 107 are arranged linearly in the vertical direction.

[0037] A locking cover 108 is slidably mounted on the outer side of the boss 105. Sliding grooves 401 are symmetrically provided on the vertical outer walls of both sides of the first groove 106. A slide rail 402 is provided on the side of the locking cover 108 facing the base plate 101 and corresponding to the two sliding grooves 401. The sliding grooves 401 on the locking cover 108 are adapted to the slide rails 402 on the first groove 106 (i.e., assembled by clearance fit). The locking cover 108 is slidably connected in the sliding grooves 401 through the slide rails 402, so that the locking cover 108 can move up and down in the sliding grooves 401 when it needs to be opened or closed. This can limit the locking cover 108 and prevent the locking cover 108 from coming out of the first groove 106 laterally. It can also improve the convenience of adjusting the locking cover 108 and make the locking cover 108 more easily and quickly.

[0038] As shown in the figure: The lock cover 108 is located on the side of the boss 105 away from the base plate 101. The lock cover 108 is provided with a mounting groove on the vertical surface of the base plate 101 (that is, the mounting groove is provided on the vertical surface of one side of the lock cover 108). The lock cover 108 is also provided with a through hole 110. The two ends of the through hole 110 are provided with plugs, and the mounting groove is formed between the two plugs. The plugs are used to limit the two sides of the through hole 110 and to form a mounting groove between the through holes 110. A shaft thread 109 is passed through the mounting groove. The shaft thread 109 is provided so that the position can be adjusted in the two placement grooves under the limit of the limiting boss 107. Thus, when the lock cover 108 needs to move up and down, it can be adjusted in the two placement grooves at the upper and lower parts by the shaft thread 109, thereby achieving the purpose of opening or closing the lock cover 108.

[0039] The outer wall of the shaft wire 109 abuts against the limiting protrusion 107, and the outer wall of the shaft wire 109 abuts against the inner wall of the mounting groove, so that the shaft wire 109 is horizontally positioned in the two placement grooves, and the shaft wire 109 abuts against the limiting protrusion 107 and the inner wall of the mounting groove at the same time, forming a lateral (i.e. horizontal) constraint on the shaft wire 109, preventing it from shifting left or right in the placement groove (in conjunction with the vertical linear arrangement of the placement groove and the limiting protrusion 107 as described above). Thus, when the sliding cover slides up and down, the shaft wire 109 can only move linearly along the placement grooves on both sides of the limiting protrusion 107, avoiding the locking cover 108 from tilting or getting stuck due to the shaking of the shaft wire 109, and ensuring the stability of the locking cover 108 moving vertically along the slide groove 401.

[0040] The two ends of the shaft wire 109 are fixedly connected to the facing surfaces of the two plugs (or the shaft wire 109 can be used directly, and the two ends of the shaft wire 109 can be welded to the two ends of the through hole 110 by a spot welding machine, so that the shaft wire 109 passes into the through hole 110 and is welded, and the two ends of the shaft wire 109 are flush with the two sides of the lock cover 108, and the two ends of the shaft wire 109 are fixedly connected to the two sides of the lock cover 108, thus eliminating the need to use plugs and simplifying the installation steps). The plugs are used to limit the shaft wire 109 to prevent the shaft wire 109 from deflecting during movement, and to prevent the shaft wire 109 from falling off during use after limiting the shaft wire 109.

[0041] like Figure 1 , 3 As shown in Figure 4: The outer wall of the lock cover 108 corresponding to the shaft wire 109 forms a protrusion structure 201 coaxial with the mounting groove. The protrusion structure 201 extends away from the base plate 101 to make way for the deformed shaft wire 109, so that the shaft wire 109 can cross the limiting protrusion 107, further improving the adjustment rate of the lock cover 108 and reducing the adjustment time of the shaft wire 109. Moreover, the clearance space of the protrusion structure 201 can reduce the frictional loss between the shaft wire 109 and the lock cover 108 and the limiting protrusion 107, extend the service life of the components, and at the same time avoid the impact of debris caused by excessive wear on the overall performance.

[0042] The shaft wire 109 is made of a deformable material, which allows it to deform under external force and adjust its position in the two placement slots within the first groove 106. In conjunction with the limiting protrusion 107, when the lock cover 108 needs to be opened, the lock cover 108 is slid upwards, and the shaft wire 109 will move upwards accordingly. Since the shaft wire 109 is made of a deformable material, it will deform when it comes into contact with the limiting protrusion 107. After deformation, the shaft wire 109 moves upwards with the lock cover 108 to the uppermost placement slot. After being unrestrained, the shaft wire 109 slowly rebounds. Because no external force is applied, the shaft wire 109 will not fall downwards under the limiting protrusion 107.

[0043] Conversely, when the lock cover 108 needs to be closed, the lock cover 108 is slid down, and the shaft screw 109 will move downwards accordingly, allowing the shaft screw 109 to slide into the lowest placement groove. The limiting protrusion 107 will block the shaft screw 109. Under the action of the limiting protrusion 107, the shaft screw 109 can be limited in either placement groove (that is, when the shaft screw 109 returns to its original shape in the upper placement groove, since no external force is applied, the limiting protrusion 107 can prevent the shaft screw 109 from sliding down, and the principle is the same).

[0044] Both placement slots can store one end of the shaft wire 109, keeping the locking cover 108 open or closed. This allows the position of one end of the shaft wire 109 to be adjusted within the two placement slots. Furthermore, the locking cover 108 can be limited after being adjusted in position. By adjusting the shaft wire 109 within the two placement slots at different positions, the locking cover 108 can be prevented from falling off due to loads and stresses caused by chewing food or archwire traction, further improving the fixation effect of the orthodontic bracket.

[0045] It is worth mentioning that the shaft wire 109 is made of nickel-titanium alloy, which makes it easy to restore its original shape under the influence of oral temperature after deformation. Because nickel-titanium alloy is a shape memory alloy, when an external force is applied to the shaft wire 109 at room temperature (around 25°C) to deform it (such as when a doctor uses a tool to pry up or press down the locking cap 108), the shaft wire 109 can deform (at this time, the shaft wire 109 is in the martensitic state, the temperature is lower than the phase transition temperature, and the deformation resistance is small).

[0046] When the bracket is implanted in the oral cavity, the body temperature (36℃-37℃) causes the temperature of the shaft wire 109 to rise (at this time, the shaft wire 109 is in the austenitic state, that is, the temperature is higher than the phase transition temperature). The shaft wire 109 can return to its initial shape, preventing the shaft wire 109 from falling off from the corresponding placement slot.

[0047] like Figure 2 , 3 As shown: the boss 105, the first groove 106 and the limiting protrusion 107 are all set as rectangular structures, which facilitates the use of the outer wall of the shaft wire 109 to enhance the limiting effect on the shaft wire 109, further improve the adjustment rate of the shaft wire 109 and reduce the adjustment time of the shaft wire 109, and can reduce stress concentration or local weakness caused by irregularity, and avoid excessive wear or jamming of the parts during use. The straight edge of the rectangular structure and the outer wall (cylindrical) of the shaft wire 109 form a tight fit between the plane and the curved surface, effectively limiting the lateral (horizontal) offset of the shaft wire 109.

[0048] The limiting protrusion 107 divides the first groove 106 into two symmetrical placement slots, and the three are arranged linearly in the vertical direction, so that the shaft wire 109 can only move along the vertical trajectory of the first groove 106 (two placement slots), avoiding the locking cover 108 from tilting or getting stuck due to trajectory deviation, and ensuring the stability of the locking cover 108 sliding vertically along the slide groove 401.

[0049] like Figure 1 , 4As shown: A second groove is provided on the top surface of the lower wing 104 near the edge of the lock cover 108. The second groove and the lock cover 108 form an operating groove 303. The operating groove 303 is used to place a lock-picking tool to open the lock cover 108, so that the lock cover 108 can be opened quickly. When it is necessary to close the lock cover 108, the lock cover 108 is closed by pressing the top of the lock cover 108 downward with the lock-picking tool.

[0050] A first protrusion 301 is provided on the vertical surface of one end of the lock cover 108 near the lower wing 104, and a second protrusion 302 is provided on the vertical surface of the lower wing 104. The first protrusion 301 and the second protrusion 302 form a force-bearing point, which improves the stability and safety during the unlocking operation and prevents the lock cover 108 from deforming due to improper force application. That is, the first protrusion 301 and the second protrusion 302 form symmetrical force-bearing points, so that the load (push force, pull force, etc.) during unlocking is evenly distributed through the two protrusions, avoiding local stress concentration caused by excessive force on a single point. The two protrusions can increase the material thickness of the connection area between the lock cover 108 and the lower wing 104, and improve the ability to resist deformation (even if the force is large, the load can be distributed through the structural strength to prevent the lock cover 108 from breaking or deforming due to local overload).

[0051] During assembly, press the lock cover 108 into the groove 401. When the bottom of the lock cover 108 touches the upper surface of the second groove, it indicates that the lock cover 108 is pressed in place. Then, thread the shaft thread 109 through the through hole 110 of the lock cover 108, so that the shaft thread 109 enters the mounting groove. When you feel one end of the shaft thread 109 protruding from the other end of the through hole 110 (if welding is not used, simply insert the shaft thread 109 and install the two plugs on both sides of the through hole 110), at this time, both ends of the shaft thread 109 are just flush with the vertical surfaces on both sides of the lock cover 108. Use a spot welding machine to weld the connection between the shaft thread 109 and the outer plane of the lock cover 108 (or install the plugs on both sides of the through hole 110) to fix the shaft thread 109 on the lock cover 108.

[0052] Next, place the unlocking tool in the second groove and pry it upwards with a little force. The lock cover 108 will move upwards along the slide groove 401 on both sides. The insertion end of the axial wire 109 will also move upwards in the first groove 106. The outer wall of one end of the axial wire 109 will deform under the influence of the limiting protrusion 107. After deformation, the axial wire 109 can move along the side wall of the limiting protrusion 107 to the upper placement groove. After moving to the uppermost placement groove, wait a few seconds and then release. The axial wire 109 will return to its original shape due to the temperature (to prevent the lock cover 108 from slipping off because the axial wire 109 has not returned to its original shape). Under no external force, the axial wire 109 will be blocked by the limiting protrusion 107 and will not fall out of the uppermost placement groove. At this time, the bottom of the lock cover 108 just reaches the lower surface of the upper wing 103 and is flush with it. The lock cover 108 is in the unlocked state, and the bow wire can be inserted into the bow wire groove 111.

[0053] Using a lock-picking tool, press down gently against the top of the lock cover 108. The lock cover 108 will then move downwards, and the bow wire 109 will fall into the lowest placement groove. At this time, the bottom of the lock cover 108 will just be in contact with the upper surface of the lower wing 104, and the lock cover 108 will be in the closed state, thereby realizing the opening and closing of the bow wire groove 111.

[0054] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An orthodontic bracket, comprising a base plate (101), a fixing block (102) disposed on the base plate (101), the fixing block (102) comprising an upper wing (103) and a lower wing (104), the gap between the upper wing (103) and the lower wing (104) forming an archwire groove (111), characterized in that: A boss (105) is provided on the vertical surface of the upper wing (103) away from the bottom plate (101), and a first groove (106) is provided on the vertical surface of the boss (105) away from the bottom plate (101); A limiting protrusion (107) is provided on the vertical inner wall of the first groove (106) near the bottom plate (101). The limiting protrusion (107) divides the first groove (106) into two placement slots. The two placement slots are located on both sides of the limiting protrusion (107), and the two placement slots are arranged linearly with the limiting protrusion (107). A locking cover (108) is slidably fitted on the outside of the boss (105). The locking cover (108) is provided with an installation groove on the vertical surface of the base plate (101). A shaft thread (109) is threaded through the installation groove. The outer wall of the shaft thread (109) abuts against the outer wall of the limiting protrusion (107). The outer wall of the shaft thread (109) abuts against the inner wall of the installation groove. The shaft wire (109) is made of a deformable material, so that the shaft wire (109) can be deformed under the action of external force so that its position can be adjusted in the two placement slots in the first groove (106).

2. The orthodontic bracket as described in claim 1, characterized in that: The shaft wire (109) is made of nickel-titanium alloy, which makes it easy to restore its original shape under the action of oral cavity temperature after deformation.

3. The orthodontic bracket as described in claim 2, characterized in that: The shaft wire (109) is configured as a cylindrical structure, so that the load is diffused through the arc surface of the shaft wire (109), avoiding the accidental dislodgement of the lock cover (108) caused by local breakage of the shaft wire (109).

4. The orthodontic bracket as described in claim 1, characterized in that: The lock cover (108) has a through hole (110) through it, and plugs are provided at both ends of the through hole (110). An installation groove is formed between the two plugs. The two ends of the shaft (109) are connected to the facing surfaces of the two plugs to limit the shaft (109) and prevent the shaft (109) from deflecting during movement. The lock cover (108) forms a protrusion structure (201) on the outer wall of the corresponding shaft wire (109) that is coaxial with the mounting groove. The protrusion structure (201) extends away from the base plate (101) to make way for the deformed shaft wire (109) so that the shaft wire (109) can pass over the limiting protrusion (107).

5. The orthodontic bracket as described in claim 1, characterized in that: The boss (105), the first groove (106) and the limiting protrusion (107) are all set as rectangular structures, which facilitates the use of the outer wall of the shaft wire (109) to enhance the limiting effect on the shaft wire (109).

6. The orthodontic bracket as described in claim 5, characterized in that: The first groove (106) has a sliding groove (401) on both sides of its vertical outer wall. The lock cover (108) has a sliding rail (402) symmetrically arranged on the side facing the bottom plate (101). The sliding rail (402) is adapted to the sliding groove (401). The lock cover (108) is slidably connected in the sliding groove (401) through the sliding rail (402).

7. The orthodontic bracket as described in claim 1, characterized in that: A second groove is provided on the top surface of the lower wing (104) near the edge of the lock cover (108), which forms an operating groove (303) between the second groove and the lock cover (108). The operating groove (303) is used to place a lock-picking tool to open the lock cover (108).

8. The orthodontic bracket as described in claim 7, characterized in that: A first protrusion (301) is provided on one vertical surface of the lock cover (108) and near the lower wing (104), and a second protrusion (302) is provided on one vertical surface of the lower wing (104). The first protrusion (301) and the second protrusion (302) form a force fulcrum, which improves the stability and safety of the unlocking operation.

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