Front traction device for orthodontics

Abstract

The utility model relates to the technical field of orthodontics, in particular to an orthodontics front traction device which comprises a forehead fixing assembly, a chin fixing assembly and a traction fixing assembly. The forehead fixing assembly comprises a forehead support, first supporting rods arranged on the two sides of the forehead support, and first adjusting pieces used for connecting the forehead support and the first supporting rods and allowing the forehead support to rotate. The chin fixing assembly comprises a second supporting rod and a chin support arranged on the second supporting rod and movably connected with the second supporting rod. The traction fixing assembly comprises a traction rod and a fixing block arranged on the traction rod. The traction rod is movably connected with the first supporting rod and the second supporting rod through a second adjusting piece. According to the orthodontic front traction device, the forehead support is allowed to rotate, so that the forehead fitness is good and the comfort level is high when a patient uses the orthodontic front traction device; the traction rod is allowed to rotate, and fine adjustment of the direction and magnitude of traction force can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of orthodontic technology, and in particular to an orthodontic anterior traction device. Background Technology

[0002] Patients with skeletal Class III malocclusion often present with a concave mid-face, affecting their appearance. The majority of these cases are caused by underdevelopment of the maxilla. As they grow and develop, the differential growth of the maxilla and mandible can further affect their appearance and may even lead to psychological problems in some patients.

[0003] Current technology uses anterior traction devices to treat skeletal Class III malocclusion caused by maxillary hypoplasia, improving midfacial retraction. Because the orthodontic force of the anterior traction device is relatively large, originates from outside the mouth, and requires prolonged nighttime wear by children and adolescents, high comfort is essential. Therefore, the stability and comfort of the appliance are crucial conditions for the orthodontic force to be effective.

[0004] However, the forehead support of the existing anterior traction device cannot be adjusted to fit the forehead shape of all patients. As a result, the forehead fit is poor and the comfort is not good when worn by some patients. In addition, the adjustment of the traction bar is only in the single front-back direction, and there are no quantitative indicators in the adjustment process, so it is impossible to accurately adjust the direction and magnitude of the traction force. Therefore, it is impossible to guarantee the ideal orthodontic accuracy and consistent orthodontic effect during orthodontic treatment.

[0005] Therefore, it is crucial to provide an orthodontic traction device that can solve the above-mentioned technical problems. Utility Model Content

[0006] To address the aforementioned problems, the purpose of this invention is to provide an orthodontic pre-traction device, comprising a forehead fixation component, a chin fixation component, and a traction fixation component. The forehead fixation component includes a forehead support, first support rods disposed on both sides of the forehead support, and a first adjusting member for connecting the forehead support and the first support rods and allowing the forehead support to rotate. The chin fixation component includes a second support rod and a chin support disposed on and movably connected to the second support rod. The traction fixation component includes a traction rod and a fixing block disposed on the traction rod. The traction rod is movably connected to the first and second support rods via a second adjusting member. In this orthodontic pre-traction device, the forehead support allows rotation, resulting in a good forehead fit and high comfort for the patient; the traction rod allows rotation, enabling precise adjustment of the direction and magnitude of the traction force.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] This utility model provides an orthodontic pre-traction device, including a frontal fixation component, a chin fixation component, and a traction fixation component;

[0009] The forehead fixing assembly includes a forehead support, first support rods disposed on both sides of the forehead support, and a first adjusting member for connecting the forehead support and the first support rods and allowing the forehead support to rotate;

[0010] The chin fixing assembly includes a second support rod and a chin support disposed on the second support rod and movably connected to the second support rod;

[0011] The traction fixing assembly includes a traction rod and a fixing block (for cooperating with an external rubber band) disposed on the traction rod;

[0012] The traction rod is movably connected to the first support rod and the second support rod through a second adjusting member.

[0013] In this invention, the forehead support has a shape that is adapted to the forehead; the chin support has a shape that is adapted to the chin.

[0014] The forehead support is allowed to rotate under the action of the first adjusting member, and the first support rod is allowed to move along the x-direction under the action of the first adjusting member; the first support member is allowed to move along the z-direction under the action of the second adjusting member; the traction rod is allowed to move along the y-direction under the action of the second adjusting member, and is also allowed to rotate under the action of the second adjusting member.

[0015] In this utility model, the first support rod, the second support rod, and the traction rod are all elastic metal parts.

[0016] In one embodiment of this utility model, the first adjusting member includes a fixed frame and a ball joint;

[0017] The fixing frame is sleeved on the outer surface of the first support rod and is movably connected to the first support rod. The side of the fixing frame near the forehead support is connected to the ball joint through the first connecting rod, and the ball joint is connected to the forehead support through the second connecting rod.

[0018] In one embodiment of the present invention, the ball joint includes a spherical protrusion and a spherical groove for receiving the spherical protrusion;

[0019] The spherical groove is fixedly connected to the first connecting rod, and the spherical protrusion is fixedly connected to the second connecting rod;

[0020] The spherical groove is provided with a through hole, and the spherical protrusion is fixed relative to the spherical groove by inserting a locking bolt into the through hole.

[0021] In one embodiment of this utility model, the fixed frame is provided with a through hole, and the first support rod is fixed relative to the fixed frame by inserting a locking bolt into the through hole.

[0022] In one embodiment of the present invention, the second adjusting member includes a columnar and integrated first support rod adjusting block, a second support rod adjusting block, and a traction rod adjusting block disposed between the first support rod adjusting block and the second support rod adjusting block;

[0023] Among them, the central axes of the first support rod adjusting block, the second support rod adjusting block, and the traction rod adjusting block are the same;

[0024] The outer diameters of the first support rod adjusting block and the second support rod adjusting block are larger than the outer diameter of the traction rod adjusting block;

[0025] A rotating block is fitted onto the outer surface of the traction rod adjusting block;

[0026] The first support rod adjusting block is provided with a first guide hole in the vertical direction, allowing the first support rod to pass through; the second support rod adjusting block is provided with a second guide hole in the vertical direction, allowing the second support rod to pass through.

[0027] The rotating block is provided with a third guide hole that allows the traction rod to pass through.

[0028] In one embodiment of this utility model, the first support rod adjusting block is provided with a through hole, and the first support rod is fixed relative to the first support rod adjusting block by inserting a locking bolt into the through hole;

[0029] The second support rod adjusting block is provided with a through hole, and the second support rod is fixed relative to the second support rod adjusting block by inserting a locking bolt into the through hole;

[0030] A through hole is provided at the position where the rotating block connects to the traction rod, and the traction rod is fixed relative to the rotating block by inserting a locking bolt into the through hole;

[0031] A through hole is provided at the position where the rotating block connects to the traction rod adjusting block, and the rotating block is fixed relative to the traction rod adjusting block by inserting a locking bolt into the through hole.

[0032] In one embodiment of this utility model, the traction rod includes a first connecting rod, a second connecting rod, and a third connecting rod that are integrally connected;

[0033] The second connecting rod is disposed at both ends of the first connecting rod, and the third connecting rod is disposed at the end of the second connecting rod away from the first connecting rod. The angle formed between the second connecting rod and the first connecting rod is an obtuse angle, and the third connecting rod is perpendicular to the first connecting rod.

[0034] The third connecting rod is movably connected to the rotating block; the fixed block is spaced apart on the first connecting rod and is movably connected to the first connecting rod.

[0035] In one embodiment of this utility model, a scale line is provided on the outer side of the third connecting rod;

[0036] The end of the third connecting rod away from the second connecting rod is provided with a limiting device (the limiting device cannot pass through the third guide hole).

[0037] In one embodiment of this utility model, a limiting member is provided on the side of the first support rod away from the forehead support (the limiting member cannot pass through the first guide hole);

[0038] A limiting element is provided on the side of the second support rod away from the chin support (the limiting element cannot pass through the second guide hole).

[0039] In one embodiment of the present invention, the orthodontic pretraction device includes an adjustable fixing strap disposed on a first support rod.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The forehead support of the forehead fixation component in the orthodontic anterior traction device of this utility model is adjustable, which can ensure good contact between the anterior traction device and the patient's forehead and improve the patient's wearing comfort.

[0042] (2) The orthodontic traction device of this utility model ensures fine adjustment of the direction and magnitude of the traction force by adjusting the rotatable part in the traction fixation component, so as to meet the needs of personalized diagnosis and treatment.

[0043] (3) The production and processing of the oral orthodontic anterior traction device of this utility model is simple and convenient. While ensuring the standardization of the anterior traction device, it can meet different clinical requirements. It can meet both mass production and the universality of different orthodontic schemes. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of an orthodontic pretraction device according to the present invention;

[0045] Figure 2 This is a front view of an orthodontic pretraction device according to the present invention;

[0046] Figure 3 This is a side view of an orthodontic pretraction device according to the present invention;

[0047] Figure 4 This is a schematic diagram of the traction fixation component in an orthodontic pre-traction device according to the present invention;

[0048] Figure 5 This is a schematic diagram of the structure of the first adjusting block in an orthodontic pretraction device according to the present invention;

[0049] Figure 6 This is a partial sectional view of the first adjusting block in an orthodontic pretraction device according to the present invention.

[0050] Figure 7 This is a schematic diagram of the structure of the second adjusting block in an orthodontic pretraction device according to the present invention;

[0051] Figure 8 This is a partial sectional view of the second adjusting block in an orthodontic anterior traction device according to the present invention.

[0052] Figure 9 This is a schematic diagram of the adjustment (rotation) of the forehead support in an orthodontic anterior traction device according to this utility model;

[0053] Figure 10 This is a schematic diagram (rotation) of the adjustment of the chin support and traction rod in an orthodontic pretraction device according to this utility model;

[0054] Figure 11 This is a schematic diagram (along the y-direction) of the adjustment of the traction rod in an orthodontic pre-traction device according to the present invention.

[0055] The following are the labeling elements in the diagram: 1. Forehead fixing component; 101. Forehead support; 102. First support rod; 2. Chin fixing component; 201. Chin support; 202. Second support rod; 3. Traction fixing component; 301. Traction rod; 3011. First connecting rod; 3012. Second connecting rod; 3013. Third connecting rod; 302. Fixing block; 4. First adjusting component; 401. Fixing frame; 402. Ball joint; 4021. Spherical protrusion; 4022. Spherical groove; 403. First connecting rod; 404. Second connecting rod; 5. Second adjusting component; 501. First support rod adjusting block; 502. Second support rod adjusting block; 503. Third support rod adjusting block; 504. Rotating block; 505. First guide hole; 506. Second guide hole; 507. Third guide hole; 6. Adjustable fixing strap; 7. Limiting component. Detailed Implementation

[0056] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used for distinction in description and have no special meaning.

[0060] Unless otherwise specified, the structures or components used in the following embodiments are all conventional structures or components in the art, as long as they can achieve the corresponding functions.

[0061] Example 1

[0062] This embodiment provides an orthodontic anterior traction device, such as... Figures 1-11 As shown, the device includes a forehead fixation component 1, a chin fixation component 2, and a traction fixation component 3. The forehead fixation component 1 includes a forehead support 101, first support rods 102 disposed on both sides of the forehead support 101, and a first adjusting member 4 for connecting the forehead support 101 and the first support rods 102 and allowing the forehead support 101 to rotate. The chin fixation component 2 includes a second support rod 202 and a chin support 201 disposed on and movably connected to the second support rod 202. The traction fixation component 3 includes a traction rod 301 and a fixing block 302 disposed on the traction rod 301 (for use with orthodontic traction elastic bands). The traction rod 301 is movably connected to the first support rod 102 and the second support rod 202 through the second adjusting member 5.

[0063] Furthermore, the forehead support 101 has a shape that adapts to the forehead; the chin support 201 has a shape that adapts to the mandible.

[0064] The forehead support 101 is allowed to rotate under the action of the first adjusting member 4; the first support rod 102 is allowed to move along the x-direction under the action of the first adjusting member 4; the first support member is allowed to move along the z-direction under the action of the second adjusting member 5; the traction rod 301 is allowed to move along the y-direction under the action of the second adjusting member 5, and is also allowed to rotate under the action of the second adjusting member 5.

[0065] Furthermore, the first support rod 102, the second support rod 202, and the traction rod 301 are all elastic metal parts.

[0066] Furthermore, the first adjusting member 4 includes a fixing frame 401 and a ball joint 402; the fixing frame 401 is sleeved on the outer surface of the first support rod 102 and is movably connected to the first support rod 102; the side of the fixing frame 401 near the forehead support 101 is connected to the ball joint 402 through a first connecting rod 403; and the ball joint 402 is connected to the forehead support 101 through a second connecting rod 404.

[0067] Furthermore, the ball joint 402 includes a spherical protrusion 4021 and a spherical groove 4022 for accommodating the spherical protrusion 4021; the spherical groove 4022 is fixedly connected to the first connecting rod 403, and the spherical protrusion 4021 is fixedly connected to the second connecting rod 404; the spherical groove 4022 is provided with a through hole, and the spherical protrusion 4021 is fixed relative to the spherical groove 4022 by inserting a locking bolt into the through hole.

[0068] Furthermore, the fixing frame 401 is provided with a through hole, and the first support rod 102 is fixed relative to the fixing frame 401 by inserting a locking bolt into the through hole.

[0069] Furthermore, the second adjusting member 5 includes a columnar and integrated first support rod adjusting block 501, a second support rod adjusting block 502, and a traction rod adjusting block 503 disposed between the first support rod adjusting block 501 and the second support rod adjusting block 502;

[0070] The central axes of the first support rod adjusting block 501, the second support rod adjusting block 502, and the traction rod adjusting block 503 are the same; the outer diameters of the first support rod adjusting block 501 and the second support rod adjusting block 502 are larger than the outer diameter of the traction rod adjusting block 503 (preferably, the outer diameters of the first support rod adjusting block 501 and the second support rod adjusting block 502 are the same); a rotating block 504 is sleeved on the outer surface of the traction rod adjusting block 503; the first support rod adjusting block 501 is provided with a first guide hole 505 that allows the first support rod 102 to pass through in a vertical direction, and the second support rod adjusting block 502 is provided with a second guide hole 506 that allows the second support rod 202 to pass through in a vertical direction; the rotating block 504 is provided with a third guide hole 507 that allows the traction rod 301 to pass through.

[0071] Furthermore, the first support rod adjusting block 501 is provided with a through hole, and the first support rod 102 is fixed relative to the first support rod adjusting block 501 by inserting a locking bolt into the through hole; the second support rod adjusting block 502 is provided with a through hole, and the second support rod 202 is fixed relative to the second support rod adjusting block 502 by inserting a locking bolt into the through hole; the rotating block 504 is provided with a through hole at the position where it connects to the traction rod 301, and the traction rod 301 is fixed relative to the rotating block 504 by inserting a locking bolt into the through hole; the rotating block 504 is provided with a through hole at the position where it connects to the traction rod adjusting block 503, and the rotating block 504 is fixed relative to the traction rod adjusting block 503 by inserting a locking bolt into the through hole.

[0072] Furthermore, the traction rod 301 includes an integrally connected first connecting rod 3011, a second connecting rod 3012, and a third connecting rod 3013; the second connecting rod 3012 is disposed at both ends of the first connecting rod 3011, and the third connecting rod 3013 is disposed at the end of the second connecting rod 3012 away from the first connecting rod 3011; the included angle formed between the second connecting rod 3012 and the first connecting rod 3011 is an obtuse angle, and the third connecting rod 3013 is perpendicular to the first connecting rod 3011;

[0073] The third connecting rod 3013 is movably connected to the rotating block 504; the fixed block 302 is spaced apart on the first connecting rod 3011 and is movably connected to the first connecting rod 3011.

[0074] Furthermore, the outer side of the third connecting rod 3013 is provided with scale lines; the end of the third connecting rod 3013 away from the second connecting rod 3012 is provided with a detachable limiting member 7 (the limiting member 7 cannot pass through the third guide hole 507).

[0075] Furthermore, the 0 point of the scale line is the position where the third connecting rod 3013 connects to the second connecting rod 3012.

[0076] Furthermore, a detachable limiting member 7 is provided on the side of the first support rod 102 away from the forehead support 101 (the limiting member 7 cannot pass through the first guide hole 505).

[0077] A detachable limiting member 7 is provided on the side of the second support rod 202 away from the chin support 201 (the limiting member 7 cannot pass through the second guide hole 506).

[0078] Furthermore, the orthodontic pretraction device includes an adjustable fixing strap 6 disposed on the first support rod 102.

[0079] In use, adjust the length of the two first support rods 102 along the x-direction (the length of the two first support rods 102 along the x-direction decreases when they move closer to each other along the fixed frame 401, and vice versa) so that they can fit the width of the patient's face, and then use locking bolts to fix the first support rods 102 and the fixed frame 401.

[0080] Adjust the angle of the ball joint 402 to match the ball protrusion 4021 and the ball groove 4022 to adjust the angle of the forehead support 101 so that the forehead support 101 fits against the patient's forehead. Then use locking bolts to fix the ball protrusion 4021 and the ball groove 4022.

[0081] Adjust the lengths of the first support rod 102 and the second support rod 202 along the y-direction to match the length of the patient's face (this adjustment process requires ensuring that the forehead support 101 matches the patient's forehead, the chin support 201 matches the patient's mandible, and the traction rod 301 matches the front traction hook attached to the patient's intraoral appliance). Then, fix the first support rod 102 and the first support rod adjustment block 501, and the second support rod 202 and the second support rod adjustment block 502 respectively using locking bolts.

[0082] Adjust the angle of the chin support 201 so that it fits against the patient's chin, and then use locking bolts to fix the chin support 201 and the second support rod 202.

[0083] The anterior traction device is secured to the patient's head using an adjustable fixation strap (the length of the adjustable fixation strap 6 can be adjusted to meet the needs of different patients);

[0084] The angle and distance of the traction rod 301 from the patient's mouth along the y direction are adjusted by the rotating block 504 to meet the patient's orthodontic needs. Then, the rotating block 504 and the traction rod adjusting block 503, as well as the rotating block 504 and the traction rod 301, are fixed by locking bolts respectively.

[0085] Adjust the distance between the two fixing blocks 302 to meet the patient's orthodontic needs, and then fix the fixing blocks 302 and the traction rod 301 by locking bolts; fix one end of the rubber band to the fixing block 302 and the other end to the front traction hook attached to the orthodontic appliance in the patient's mouth.

[0086] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the interpretation of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. An orthodontic pre-traction device, characterized in that, It includes a forehead fixation component (1), a chin fixation component (2), and a traction fixation component (3); The forehead fixing assembly (1) includes a forehead support (101), first support rods (102) disposed on both sides of the forehead support (101), and a first adjusting member (4) for connecting the forehead support (101) and the first support rods (102) and allowing the forehead support (101) to rotate; The chin fixing assembly (2) includes a second support rod (202) and a chin support (201) disposed on the second support rod (202) and movably connected to the second support rod (202); The traction fixing assembly (3) includes a traction rod (301) and a fixing block (302) disposed on the traction rod (301); The traction rod (301) is movably connected to the first support rod (102) and the second support rod (202) through the second adjusting member (5).

2. The orthodontic pretraction device according to claim 1, characterized in that, The first adjusting member (4) includes a fixing frame (401) and a ball joint (402); The fixing frame (401) is sleeved on the outer surface of the first support rod (102) and is movably connected to the first support rod (102). The side of the fixing frame (401) near the forehead support (101) is connected to the ball joint (402) through the first connecting rod (403). The ball joint (402) is connected to the forehead support (101) through the second connecting rod (404).

3. The orthodontic pretraction device according to claim 2, characterized in that, The ball joint (402) includes a spherical protrusion (4021) and a spherical groove (4022) for receiving the spherical protrusion (4021); The spherical groove (4022) is fixedly connected to the first connecting rod (403), and the spherical protrusion (4021) is fixedly connected to the second connecting rod (404); The spherical groove (4022) is provided with a through hole, and the spherical protrusion (4021) is fixed relative to the spherical groove (4022) by inserting a locking bolt into the through hole.

4. The orthodontic pretraction device according to claim 2, characterized in that, The fixed frame (401) is provided with a through hole, and the first support rod (102) is fixed relative to the fixed frame (401) by inserting a locking bolt into the through hole.

5. The orthodontic pretraction device according to claim 1, characterized in that, The second adjusting member (5) includes a columnar and integrated first support rod adjusting block (501), a second support rod adjusting block (502), and a traction rod adjusting block (503) disposed between the first support rod adjusting block (501) and the second support rod adjusting block (502). Among them, the central axes of the first support rod adjusting block (501), the second support rod adjusting block (502), and the traction rod adjusting block (503) are the same; The outer diameters of the first support rod adjusting block (501) and the second support rod adjusting block (502) are larger than the outer diameter of the traction rod adjusting block (503); The outer surface of the traction rod adjusting block (503) is fitted with a rotating block (504); The first support rod adjusting block (501) is provided with a first guide hole (505) in the vertical direction, allowing the first support rod (102) to pass through; the second support rod adjusting block (502) is provided with a second guide hole (506) in the vertical direction, allowing the second support rod (202) to pass through. The rotating block (504) is provided with a third guide hole (507) that allows the traction rod (301) to pass through.

6. The orthodontic pretraction device according to claim 5, characterized in that, The first support rod adjusting block (501) is provided with a through hole, and the first support rod (102) is fixed relative to the first support rod adjusting block (501) by inserting a locking bolt into the through hole; The second support rod adjusting block (502) is provided with a through hole, and the second support rod (202) is fixed relative to the second support rod adjusting block (502) by inserting a locking bolt into the through hole; The rotating block (504) is provided with a through hole at the position where it connects with the traction rod (301), and the traction rod (301) is fixed relative to the rotating block (504) by inserting a locking bolt into the through hole; The rotating block (504) is provided with a through hole at the position where it connects with the traction rod adjusting block (503), and the rotating block (504) is fixed relative to the traction rod adjusting block (503) by inserting a locking bolt into the through hole.

7. The orthodontic pretraction device according to claim 6, characterized in that, The traction rod (301) includes an integrally connected first connecting rod (3011), a second connecting rod (3012), and a third connecting rod (3013); The second connecting rod (3012) is disposed at both ends of the first connecting rod (3011), and the third connecting rod (3013) is disposed at the end of the second connecting rod (3012) away from the first connecting rod (3011); The third connecting rod (3013) is movably connected to the rotating block (504); the fixed block (302) is spaced on the first connecting rod (3011) and is movably connected to the first connecting rod (3011).

8. The orthodontic pretraction device according to claim 7, characterized in that, The outer side of the third connecting rod (3013) is provided with scale lines; A limiting member (7) is provided at the end of the third connecting rod (3013) away from the second connecting rod (3012).

9. The orthodontic pretraction device according to claim 1, characterized in that, The end of the first support rod (102) is provided with a limiting member (7); The end of the second support rod (202) is provided with a limiting member (7).

10. The orthodontic pretraction device according to claim 1, characterized in that, The orthodontic pretraction device includes an adjustable fixing strap (6) mounted on a first support rod (102).

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