Orthodontic traction force testing device

Abstract

The present invention discloses an orthodontic traction force testing device, which relates to the technical field of orthodontics, including a test seat, a gum model, a tooth mold, a rotating column, a fixed block, a sliding square tube, a pivot, a rotating block, a columnar portion, a test plate, and a pressing block. A pressure detection unit is provided on the rotating block, and the pressure detection unit is used to detect the pressure of four pressing blocks on the tooth mold. The present invention uses the patient's teeth for mold making to obtain the tooth mold, and when testing, when the four pressing blocks contact the surface of the tooth model, corresponding movement will occur, thereby driving the test plate to rotate accordingly. After rotating in place, the pressure detection unit will detect the pressure of the four pressing blocks on the tooth mold, and the angle range of the tooth deformity can be determined based on the pressure of the four pressing blocks on the tooth mold, so that the doctor can more accurately apply a larger correction force to the direction with a larger deformity angle, avoiding the error caused by subjective judgment.

Description

Technical Field

[0001] The invention relates to the technical field of orthodontics, and in particular to an orthodontics traction force testing device. Background Art

[0002] Orthodontics, also known as dental correction, is an oral treatment method that uses corrective appliances (such as metal brackets, ceramic brackets, invisible braces, etc.) to adjust tooth alignment, improve bite and facial aesthetics.

[0003] Orthodontic correction generally includes invisible correction and fixed correction. Fixed correction uses archwires and brackets to correct tooth deformities, while invisible correction does not use archwires and brackets for correction. At present, when performing oral invisible orthodontic correction, designers often use software simulation to apply correction force to teeth. The software often performs according to the set value, but for some severely misaligned teeth or multiple severely misaligned teeth corrected at the same time, it is easy to cause improper correction force. If the correction force is too small, it cannot be moved. If the correction force is too large, it is easy to fall off during wearing, so that the expected clinical effect cannot be achieved; or it may cause risks such as root resorption, gingival recession, bone fenestration, bone cracking, etc. Therefore, it is very important to apply the correction force reasonably within the appropriate angle range, so it is necessary to provide a test device that can assist doctors in determining the direction of orthodontic correction. Summary of the invention

[0004] The purpose of the present invention is to provide an orthodontic traction force testing device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An orthodontic traction force testing device, comprising:

[0007] A test seat, wherein a gum model installation slot is provided on the top of the test seat, a gum model is detachably installed in the gum model installation slot, and a tooth mold is provided on the upper surface of the gum model;

[0008] A rotating column rotatably connected to the top of the test seat, wherein a fixed block is fixedly connected to the upper surface of the rotating column, and a sliding square tube is horizontally penetrated through the outer wall of the fixed block, and the sliding square tube slides freely horizontally on the fixed block;

[0009] A rotating block is pivotally connected to the end of the sliding square tube by installing a rotating block, a cylindrical portion extending in the direction of the tooth mold is horizontally fixed to the lower end of the rotating block, a test plate is rotatably connected to one end of the cylindrical portion toward the test seat, four pressure blocks are fixed to the end surface of the test plate in an axial array, and a pressure detection unit is provided on the rotating block, and the pressure detection unit is used to detect the pressure exerted on the four pressure blocks by the tooth mold.

[0010] Through the above technical scheme, the patient's teeth are used for molding to obtain a tooth mold. When testing, the sliding square tube is first pulled to make the pressure block contact the surface of a tooth model in the tooth mold to be tested. When the four pressure blocks contact the surface of the tooth model, corresponding movement will occur, thereby driving the test plate to rotate accordingly. After rotating into place, the pressure detection unit will detect the pressure of the four pressure blocks on the tooth mold. The angle range of the tooth deformity can be determined based on the pressure of the four pressure blocks on the tooth mold, so that the doctor can more accurately apply a larger corrective force to the direction with a larger deformity angle, avoiding errors caused by subjective judgment.

[0011] Furthermore, a sliding block is telescopically installed in the sliding square tube, a first short pin is fixedly connected to the upper surface of the sliding block, a second short pin is fixedly connected to the surface of the fixed block, a rubber band is wrapped around the first short pin and the second short pin, and a waist-shaped hole is opened on the upper surface of the sliding square tube for the first short pin to move freely through.

[0012] Through the above technical solution, the rubber band generates a pulling force on the first short pin, so that the first short pin drives the sliding block to slide in the sliding square tube toward the fixed block until the first short pin abuts against the inner wall of one side of the waist-shaped hole, and then the sliding square tube can be driven to slide on the fixed block, so that the rotating block can drive the test plate to move in the direction of the tooth mold until the pressing block abuts against the surface of the tooth model in the tooth mold, so that the tooth mold can be continuously tested and analyzed.

[0013] Furthermore, a spherical groove is formed at the end of the columnar portion, and a ball head is coaxially fixed to the end surface of the test plate. The ball head is engaged in the spherical groove and can rotate freely.

[0014] Through the above technical solution, the ball head rotates in the spherical groove, so that the test plate can be rotated within a larger range, so that the test plate is rotatably connected to the end of the columnar portion.

[0015] Furthermore, the pressure detection unit includes four test rods inserted through the rotating block, one end of the columnar portion adjacent to the test plate is fixedly sleeved with a fixed plate, the test rod penetrates the rotating block and the fixed plate and slides freely, one end of the test rod away from the rotating block abuts against the end face of the test plate, an outer wall of the rotating block on the side facing away from the test plate is fixedly connected to a mounting plate, four miniature pressure sensors are fixedly connected to the surface of the mounting plate, and a rubber pad is fixedly connected to the end of the test rod, and the four rubber pad surfaces respectively abut against the end faces of four miniature pressure sensors.

[0016] Through the above technical scheme, when the pressing blocks contact the surface of the tooth model of the tooth mold, the four pressing blocks will move relative to the original position, which will drive the test plate to swing, so that the ends of the four test rods are squeezed by the swinging of the test plate, and the test rods will slide on the rotating blocks, so that the pressure of the rubber pad on the micro pressure sensor will change. By collecting the pressure changes of the micro pressure sensor, the deformity angle of the tooth model can be analyzed.

[0017] Furthermore, a stop ring is fixedly sleeved on the periphery of the test rod, a spring is sleeved around the periphery of the test rod, and two ends of the spring in the direction of elastic force elastically press against the end surface of the stop ring and the surface of the rotating block respectively.

[0018] Through the above technical solution, the spring generates an elastic resisting force on the stop ring, so that the four pressing blocks can maintain contact with the surface of the tooth model in the tooth mold.

[0019] Furthermore, the positions of the four test rods and the four pressing blocks correspond one to one.

[0020] Through the above technical solution, when the pressing block moves relative to the initial position, the test rod can move with a corresponding amplitude, thereby reducing the test error.

[0021] Furthermore, the outer wall of the test seat is provided with an abutment surface matching the contour of the gum model, a mounting column is vertically fixedly connected to the outer wall of the lower side of the rotating block, a mounting sleeve is fixedly sleeved on the periphery of the mounting column, a bow arm is fixedly connected to the periphery of the mounting sleeve, and two ends of the bow arm are in abutment connection with the abutment surface.

[0022] Through the above technical solution, when the two ends of the bow arm are against the abutment surface, the rotating block will be automatically centered, that is, the axial direction of the cylindrical part will automatically remain perpendicular to the abutment surface. In this way, when the four pressing blocks are tested on the abutment surface, the pressing blocks can be perpendicular to the surface of the tooth model in the tooth mold, thereby improving the accuracy of the test.

[0023] Furthermore, both ends of the bow arm are rotatably connected with a pressure wheel, and the pressure wheel is in rolling contact with the abutment surface.

[0024] Through the above technical solution, the pressure wheel is in rolling contact with the abutment surface, so that the bow arm drives the rotating block to automatically center by rolling the pressure wheel on the abutment surface. The sliding of the relative bow arm end and the abutment surface reduces the resistance, thereby making the centering of the rotating block smoother and the centering accuracy higher.

[0025] Furthermore, an anti-rotation unit is provided in the sliding square tube, and the anti-rotation unit is used to limit the pressure wheel from rolling on the abutment surface.

[0026] Through the above technical solution, due to the pulling force of the rubber band on the sliding square tube, after the automatic centering is completed, the axial direction of the cylindrical part and the length direction of the sliding square tube form an angle. At this time, the pressure wheel may rotate on the arc surface of the abutment surface. Therefore, the anti-rotation unit limits the rotation of the pressure wheel, so that the rotating block is not easy to deviate after centering.

[0027] Furthermore, the anti-rotation unit includes stop pads fixedly sleeved on both ends of the pivot, the end faces of the two stop pads respectively and correspondingly slidingly contact with the upper and lower inner walls of the sliding square tube, the end of the sliding block is provided with a notch groove for the free passage of the pivot, the upper and lower outer walls of the sliding block are respectively provided with a recessed portion, the recessed portion is located between the two stop pads, and there is a slope section between the two recessed portions and the upper and lower outer walls of the sliding block, when the sliding block moves toward the direction of the fixed block, the slope section will contact the end face of the stop pad and generate a damping force on the axial rotation of the stop pad around the pivot.

[0028] Through the above technical solution, when the sliding block moves toward the fixed block, the end face of the stop pad will begin to contact the outer wall of the slope section. After being pulled by the rubber band, the end face of the stop pad and the outer wall of the slope section are squeezed, thereby generating a rotational damping force on the stop pad, so that the pivot will not rotate by itself, and the rotating block will not rotate by itself after centering.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention uses the patient's teeth to make a mold to obtain a tooth mold. When testing, the sliding square tube is first pulled to make the pressing block contact the surface of a tooth model in the tooth mold to be tested. When the four pressing blocks contact the surface of the tooth model, corresponding movement will occur, thereby driving the test plate to rotate accordingly. After rotating in place, the pressure detection unit will detect the pressure of the four pressing blocks on the tooth mold. According to the pressure of the four pressing blocks on the tooth mold, the angle range of the tooth deformity can be determined, so that the doctor can more accurately apply a larger corrective force to the direction with a larger deformity angle, avoiding the error caused by subjective judgment, thereby achieving the application of a corrective force of appropriate size within an appropriate angle range;

[0031] 2. When the pressing block of the present invention contacts the surface of the tooth model of the tooth mold, the four pressing blocks will move relative to the original position, thereby driving the test plate to swing, so that the ends of the four test rods are squeezed by the swinging of the test plate, and the test rods will slide on the rotating block, thereby causing the pressure of the rubber pad on the micro pressure sensor to change. By collecting the pressure change of the micro pressure sensor, the range of the deformity angle of the tooth model can be analyzed;

[0032] 3. When the sliding block in the present invention moves toward the fixed block, the end face of the stop pad will begin to contact the outer wall of the slope section. After being pulled by the rubber band, the end face of the stop pad and the outer wall of the slope section are squeezed, thereby generating a rotational damping force on the stop pad, so that the pivot will not rotate by itself, and the rotating block will not rotate by itself after centering. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of an orthodontic traction force testing device in the present invention;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0035] Figure 3 for Figure 1 The schematic diagram of the structure after omitting the test seat, tooth mold and gum model;

[0036] Figure 4 for Figure 3 Schematic diagram of the positional relationship after the middle part of the structure is cut open;

[0037] Figure 5 It is a schematic diagram of the structure after the rotating block, the test rod, the mounting plate and the columnar part are assembled in the present invention;

[0038] Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point A;

[0039] Figure 7 for Figure 5 A schematic diagram of the structure from another perspective.

[0040] In the figure, the description of each figure mark is as follows: 1. fixed block; 2. second short pin; 3. rubber band; 4. test seat; 5. waist-shaped hole; 6. first short pin; 7. sliding square tube; 8. tooth mold; 9. pivot; 10. rotating block; 11. mounting sleeve; 12. gum model; 13. rotating column; 14. gum model mounting groove; 15. mounting column; 16. test rod; 17. bow arm; 18. pressure wheel; 19. test plate; 20. fixed plate; 21. stop ring; 22. spring; 23. mounting plate; 24. recessed portion; 25. stop pad; 26. micro pressure sensor; 27. columnar portion; 28. pressure block; 29. ​​ball head; 30. rubber pad; 31. sliding block. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1 - Figure 7 The present invention provides a technical solution: an orthodontic traction force testing device, comprising a test seat 4 composed of a lower plate, a vertical plate and an upper plate, a top of the upper plate of the test seat 4 is provided with a dental bed model mounting groove 14, a dental bed model 12 is detachably mounted in the dental bed model mounting groove 14, specifically, a screw is vertically penetrated at the bottom of the upper plate of the test seat 4, the end of the screw penetrates into the dental bed model mounting groove 14 and is threadedly connected with the surface of the dental bed model 12, and a tooth reverse mold 8 is provided on the upper surface of the dental bed model 12, and the tooth reverse mold 8 is formed by reverse molding based on the patient's real teeth, By analyzing the deformity angle of the tooth model on the tooth mold 8 (such as longitudinal deformity, transverse deformity or complex deformity), the direction of the force required to be applied to a single tooth of the patient during orthodontic treatment can be tested, and the magnitude of the applied force can be determined according to the magnitude of the deformity angle. A through hole is provided on the top of the upper plate of the test seat 4, and a rotating shaft is installed in the through hole. The rotating shaft can rotate freely in the through hole. The upper end of the rotating shaft is coaxially fixed to a rotating column 13, and a fixed block 1 is fixed to the upper surface of the rotating column 13. A sliding square tube 7 is horizontally penetrated through the outer wall of the fixed block 1, and the sliding square tube 7 slides freely horizontally on the fixed block 1.

[0043] A pivot 9 is vertically penetrated at one end of the sliding square tube 7 away from the fixed block 1, and a stop pad 25 is fixedly sleeved at both ends of the pivot 9. The end faces of the two stop pads 25 are respectively connected to the inner walls of the upper and lower sides of the sliding square tube 7, so that the pivot 9 rotates on the sliding square tube 7 and will not be separated from the sliding square tube 7. A rotating block 10 is fixedly connected to the lower end of the pivot 9. A columnar portion 27 extending toward the tooth mold 8 is horizontally fixedly connected to the lower end of the rotating block 10. The columnar portion 27 is rotatably connected to one end of the test seat 4. The test plate 19 is specifically provided with a spherical groove at the end of the cylindrical portion 27, and a ball head 29 is coaxially fixedly connected to the end face of the test plate 19. The ball head 29 is engaged in the spherical groove and rotates freely. The ball head 29 rotates freely in the spherical groove, thereby enabling the test plate 19 to be universally rotatably connected to the end of the cylindrical portion 27. Four pressing blocks 28 are fixedly connected to the end face of the test plate 19 in an axial array. The lengths of the four pressing blocks 28 are set according to relevant technical parameters in the art, that is, the four pressing blocks 28 are against the positive When the front of the normal teeth is in front of the teeth, the test plate 19 is in a vertical state. At this time, the axis of the test plate 19 is coaxial with the columnar portion 27. The four pressing blocks 28 are respectively located on the upper, lower, left and right sides of the test plate 19. Four test rods 16 are pierced through the rotating block 10. The positions of the four test rods 16 and the four pressing blocks 28 correspond one to one. The end of the columnar portion 27 adjacent to the test plate 19 is fixedly sleeved with a fixing plate 20. The test rod 16 penetrates the rotating block 10 and the fixing plate 20 and slides freely. The end of the test rod 16 away from the rotating block 10 is connected to the fixing plate 20. The end faces of the test plate 19 are butted against each other, a mounting plate 23 is fixedly connected to the outer wall of the rotating block 10 on the side facing away from the test plate 19, four micro pressure sensors 26 are fixedly connected to the surface of the mounting plate 23, a rubber pad 30 is fixedly connected to the end of the test rod 16, and the surfaces of the four rubber pads 30 are respectively butted against the end faces of the four micro pressure sensors 26, a stop ring 21 is fixedly sleeved on the periphery of the test rod 16, a spring 22 is sleeved around the periphery of the test rod 16, and the two ends of the spring 22 in the elastic force direction elastically press against the end face of the stop ring 21 and the surface of the rotating block 10 respectively;

[0044] A sliding block 31 is telescopically inserted and installed in the sliding square tube 7. A groove is provided at the end of the sliding block 31 for the pivot 9 to pass freely. A first short pin 6 is fixedly connected to the upper surface of the sliding block 31. A second short pin 2 is fixedly connected to the surface of the fixed block 1. A rubber band 3 is wrapped around the first short pin 6 and the second short pin 2. A waist-shaped hole 5 is provided on the upper surface of the sliding square tube 7 for the first short pin 6 to move freely through. The rubber band 3 generates a pulling force on the first short pin 6, so that the first short pin 6 drives the sliding block 31 to slide in the sliding square tube 7 toward the fixed block 1 until the first short pin 6 abuts against the inner wall of the waist-shaped hole 5 on one side close to the fixed block 1, thereby driving the sliding square tube 7 to slide on the fixed block 1, so that the rotating block 10 can drive the test plate 19 to move in the direction of the tooth mold 8 until the pressing block 28 abuts against the surface of the tooth model in the tooth mold 8;

[0045] The outer wall of the test seat 4 is provided with an abutment surface (such as Figure 1 As shown, the abutting surface includes an arc segment on the left side of the upper plate of the test seat 4, and straight segments extending obliquely from the two end points of the arc segment toward both sides of the vertical plate of the test seat 4, and the straight segments are tangent to the ends of the arc segments). A mounting column 15 is vertically fixedly connected to the outer wall of the lower side of the rotating block 10, and a mounting sleeve 11 is fixedly sleeved on the periphery of the mounting column 15. A bow arm 17 is fixedly connected to the periphery of the mounting sleeve 11. A pressure wheel 18 is rotatably connected to each of the two ends of the bow arm 17. The pressure wheel 18 is in rolling contact with the abutting surface. A notch groove is provided at the end of the sliding block 31 for the pivot 9 to pass freely. A recessed portion 24 is provided on the upper and lower outer walls of the sliding block 31. The recessed portion 24 is located between the two stop pads 25. There is a slope section between the two recessed portions 24 and the upper and lower outer walls of the sliding block 31. When the sliding block 31 moves toward the fixed block 1, the slope section will contact the end face of the stop pad 25 and generate a damping force on the axial rotation of the stop pad 25 around the pivot 9.

[0046] Working principle of the present invention:

[0047] The patient's teeth are molded to form a tooth mold 8, and the tooth mold 8 is operated based on the gum model 12. For example, the tooth model can be printed on the surface of the gum model 12 by the 3D printing technology in the prior art to form the tooth mold 8, and the gum model 12 is inserted into the gum model installation groove 14 and locked by screws;

[0048] The sliding square tube 7 is pulled away from the test seat 4, so that the pressing block 28 is out of contact with the surface of the tooth mold 8, and then the sliding square tube 7 is rotated to make the sliding square tube 7 rotate around the axial direction of the rotating column 13, so that the pressing block 28 is directed to a tooth model in the tooth mold 8 to be tested, and the sliding square tube 7 is released. Under the pulling force of the rubber band 3 on the first short pin 6, the first short pin 6 will drive the sliding block 31 to slide in the sliding square tube 7 toward the fixed block 1 until the first short pin 6 abuts against the inner wall of the side of the waist-shaped hole 5 close to the fixed block 1, and then the sliding square tube 7 can be driven to slide on the fixed block 1, so that the rotating block 10 can drive the test plate 19 to move in the direction of the tooth mold 8, and the pressure wheels 18 at both ends of the bow arm 17 will first contact the abutting surface, and the pressure wheels 18 at both ends of the bow arm 17 will automatically center the rotating block 10, so that the rotating block 10 rotates to be perpendicular to the front of the tooth model (such as Figure 2 As shown, the front of the tooth model is the downward side of the tooth mold 8), as the sliding block 31 continues to move, until the pressing block 28 abuts against the surface of the tooth model in the tooth mold 8;

[0049] If the pressing wheel 18 rolls to a certain position on the abutment surface, for example, when the axial direction of the cylindrical portion 27 is not parallel to the length direction of the sliding square tube 7, the pressing wheel 18 may roll on the abutment surface (especially the arc segment) due to the tension of the rubber band 3. Therefore, in this embodiment, when the sliding block 31 contacts the surface of the tooth model when the pressing block 28, the end face of the stop pad 25 will begin to contact the outer wall of the slope segment. After the rubber band 3 pulls the first short pin 6, the end face of the stop pad 25 and the outer wall of the slope segment are squeezed, thereby generating a rotation damping force for the stop pad 25 to rotate around the pivot 9, so that the pivot 9 will not rotate by itself, and the rotating block 10 will not rotate by itself after centering. In addition, the rubber band 3 in this embodiment can be selected by those skilled in the art based on conventional technology to ensure that the tension of the rubber band 3 is sufficient to drive the slope segment of the sliding block 31 and the stop pad 25 to generate sufficient squeezing force;

[0050] When the pressing block 28 contacts the tooth model surface of the tooth mold 8, if the tooth model is deformed, the pressing block 28 will move toward the tooth model surface due to the elastic supporting force of the spring 22 on the stop ring 21, so that the four pressing blocks 28 will move relative to the original position, and then drive the test plate 19 to swing around the rotation fulcrum of the ball head 29 in the spherical groove, so that the ends of the four test rods 16 are squeezed by the swinging of the test plate 19, and the test rods 16 will produce translational motion on the rotating block 10, so that the pressure of the rubber pad 30 on the micro pressure sensor 26 changes. The pressure change of the micro pressure sensor 26 is collected by a computer device, and then the deformity angle range of the tooth model can be analyzed, which helps the doctor to analyze the deformity angle range of each deformed tooth and facilitates the application of corrective force within a relatively certain angle range.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An orthodontic traction force testing device, characterized in that: include: A test seat (4), wherein a gum model mounting groove (14) is provided on the top of the test seat (4), a gum model (12) is detachably mounted in the gum model mounting groove (14), and a tooth mold (8) is provided on the upper surface of the gum model (12); A rotating column (13) rotatably connected to the top of the test seat (4), a fixed block (1) being fixedly connected to the upper surface of the rotating column (13), a sliding square tube (7) being horizontally penetrated through the outer wall of the fixed block (1), and the sliding square tube (7) being freely slidable horizontally on the fixed block (1); A rotating block (10) is rotatably connected to the end of the sliding square tube (7) by installing a pivot (9); a columnar portion (27) extending in the direction of the tooth mold (8) is horizontally fixedly connected to the lower end of the rotating block (10); a test plate (19) is rotatably connected to one end of the columnar portion (27) facing the test seat (4); four pressure blocks (28) are fixedly connected to the end surface of the test plate (19) in an axial array; a pressure detection unit is provided on the rotating block (10); the pressure detection unit is used to detect the pressure of the four pressure blocks (28) exerted by the tooth mold (8); The pressure detection unit comprises four test rods (16) which are inserted through the rotating block (10); one end of the columnar portion (27) adjacent to the test plate (19) is fixedly sleeved with a fixed plate (20); the test rod (16) penetrates the rotating block (10) and the fixed plate (20) and slides freely; one end of the test rod (16) away from the rotating block (10) abuts against an end face of the test plate (19); an outer wall of the rotating block (10) facing away from the test plate (19) is fixedly connected to a mounting plate (23); four micro pressure sensors (26) are fixedly connected to a surface of the mounting plate (23); a rubber pad (30) is fixedly connected to an end of the test rod (16); the surfaces of the four rubber pads (30) respectively abut against the end faces of the four micro pressure sensors (26).

2. The orthodontic traction force testing device according to claim 1, characterized in that: A sliding block (31) is telescopically inserted and installed in the sliding square tube (7); a first short pin (6) is fixedly connected to the upper surface of the sliding block (31); a second short pin (2) is fixedly connected to the surface of the fixed block (1); a rubber band (3) is wrapped around the first short pin (6) and the second short pin (2); and a waist-shaped hole (5) is opened on the upper surface of the sliding square tube (7) for the first short pin (6) to move freely through.

3. The orthodontic traction force testing device according to claim 1, characterized in that: A spherical groove is formed at the end of the columnar portion (27); a spherical head portion (29) is coaxially fixedly connected to the end surface of the test plate (19); the spherical head portion (29) is engaged in the spherical groove and is freely rotatable.

4. The orthodontic traction force testing device according to claim 1, characterized in that: A stop ring (21) is fixedly sleeved on the periphery of the test rod (16), and a spring (22) is sleeved around the periphery of the test rod (16), with two ends of the spring (22) in the elastic force direction elastically pressing against the end surface of the stop ring (21) and the surface of the rotating block (10) respectively.

5. The orthodontic traction force testing device according to claim 1, characterized in that: The positions of the four test rods (16) and the four pressing blocks (28) correspond one to one.

6. The orthodontic traction force testing device according to claim 2, characterized in that: The outer wall of the test seat (4) is provided with an abutment surface matching the contour of the gum model (12); the lower outer wall of the rotating block (10) is vertically fixedly connected with a mounting column (15); the periphery of the mounting column (15) is fixedly sleeved with a mounting sleeve (11); the periphery of the mounting sleeve (11) is fixedly connected with a bow arm (17); and the two ends of the bow arm (17) are in abutment connection with the abutment surface.

7. The orthodontic traction force testing device according to claim 6, characterized in that: Both ends of the bow arm (17) are rotatably connected to a pressure wheel (18), and the pressure wheel (18) is in rolling contact with the abutment surface.

8. The orthodontic traction force testing device according to claim 7, characterized in that: An anti-rotation unit is provided in the sliding square tube (7), and the anti-rotation unit is used to limit the rolling of the pressure wheel (18) on the abutment surface.

9. The orthodontic traction force testing device according to claim 8, characterized in that: The anti-rotation unit comprises stop pads (25) fixedly sleeved on both ends of the pivot (9), the end faces of the two stop pads (25) respectively and correspondingly slide in contact with the upper and lower inner walls of the sliding square tube (7), the end of the sliding block (31) is provided with a notch groove for the pivot (9) to pass freely, the upper and lower outer walls of the sliding block (31) are respectively provided with a recessed portion (24), the recessed portion (24) is located between the two stop pads (25), and there is a slope section between the two recessed portions (24) and the upper and lower outer walls of the sliding block (31), when the sliding block (31) moves in the direction of the fixed block (1), the slope section will contact the end face of the stop pad (25), and generate a damping force on the axial rotation of the stop pad (25) around the pivot (9).

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