Orthodontic device and method for vertically and mesially moving molar and being vertically controllable

Abstract

The invention discloses an orthodontic device and method for vertically and mesially moving molar and having vertical control. The orthodontic device comprises a fixed section, an elastic section, a bidirectional composite force application section and an adjusting section which are connected in sequence. The fixed section is fixedly connected with the anchorage, the elastic section is provided with a first elastic ring, a second elastic ring, a first force arm, a second force arm and a third force arm, and the elastic section increases device elasticity and adjusts height. The bidirectional composite force application section comprises a vertical and horizontal composite curve, and comprises a first vertical part, a first horizontal part, a vertical torsion part, a second horizontal part, a second vertical part, a horizontal torsion part and a third vertical part, the vertical torsion part provides a vertical correction force, and the horizontal torsion part provides a horizontal (mesial direction) correction force. The adjusting section comprises a third elastic ring and a fourth force arm. According to the invention, the molar realizes vertical and mesial movement, meanwhile, vertical control is realized, the target molar is helped to establish a better occlusion relationship, the chair-side operation time is shortened, the treatment cycle is shortened, and the comfort of a patient is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tooth correction, and particularly relates to an orthodontic device and method for vertically moving and controlling molar. BACKGROUND

[0002] Orthodontics is a branch of stomatology, which is a discipline that studies the etiology and mechanism of malocclusion, diagnosis and analysis, and prevention and treatment. Malocclusion refers to the malformation of teeth, jaws and craniofacial caused by congenital genetic factors or environmental factors such as diseases, bad oral habits and abnormal replacement teeth during the growth and development of children, such as misaligned teeth, abnormal relationship between upper and lower dental arches, abnormal size, shape and position of jaws, etc. Malocclusion has been listed as one of the three major oral diseases by the World Health Organization (WHO), with an incidence rate of 91.20% based on the standard of ideal normal occlusion. Malocclusion seriously affects the function of the oral cavity, the appearance of the face, and the physical and mental health of the patient. Therefore, the correction of malocclusion is of great significance to adolescents and adults.

[0003] Molar mesial impaction can be caused by eruption obstruction or mixed dentition pushing molar distally. The most common molar impaction is third molar impaction, with an impaction rate of up to 69%. In a large number of clinical cases, due to molar loss or extraction, orthodontists often need to vertically move and move the third molar of the patient to replace the missing molar. Control the forward movement of the molar, close the gap between the posterior teeth, adjust the vertical height of the molar, and prevent the forward movement of the anterior teeth.

[0004] The existing devices or methods for vertical molar movement mainly include: surgery, molar distal implantation of a planting nail for vertical movement, molar band ring welding distal metal hook, NITI square wire alignment, segmental arch combined with micro-implant support upright tilting molar, etc. However, the above devices or methods have certain defects in clinical application, such as large surgical trauma and high risk, which are difficult for most patients to accept; molar distal implantation of a planting support requires high operation, has high risk, and has a high failure rate due to thick soft tissue; NITI square wire alignment has a long cycle and complicated operation, and the support tooth is shifted; the existing molar vertical movement technology cannot provide continuous and stable vertical molar force, and the vertical force provided by the device will be greatly attenuated after the molar is vertically moved and inclined; the existing technology requires full arch bracket arch wire orthodontic treatment, which cannot meet the requirements of local treatment for some patients, has a long treatment cycle, and is high in cost; the existing technology requires step-by-step molar vertical movement and molar mesial movement, which leads to complicated operation during patient reexamination, long chair-side operation time, and poor comfort. SUMMARY

[0005] In order to overcome the above problems, the present application provides an orthodontic device and method for vertically moving and controlling molar.

[0006] The first aspect of the present application provides an orthodontic device for vertical and mesial movement of molar and vertical control, which is arranged between the impacted molar (24) and the premolar area of a patient, with the end of the orthodontic device towards the impacted molar (24) being the distal direction and the end of the orthodontic device towards the premolar area being the mesial direction; the orthodontic device is formed by bending a round wire, including a fixed segment (1), an elastic segment (2), a bidirectional composite force segment (3) and an adjustment segment (4) connected in sequence from mesial to distal.

[0007] The mesial end of the fixed segment (1) is a free end, and the free end of the fixed segment (1) is fixedly connected with the anchorage located in the premolar area;

[0008] The elastic segment (2) is arranged with at least one small loop curve I, which is an elastic loop formed by winding the round wire, and the round wire segments on both sides of the small loop curve I are force arms I; the small loop curve I increases the elasticity of the orthodontic device, and the angle between the force arms I is adjusted to realize the height adjustment of the elastic segment (2);

[0009] The bidirectional composite force segment (3) is arranged with at least one vertical + horizontal composite curve, which includes a first vertical part (11), a first horizontal part (12), a vertical torsion part (13), a second horizontal part (14), a second vertical part (15), a horizontal torsion part (16) and a third vertical part (17) connected in sequence; the first horizontal part (12), the vertical torsion part (13) and the second horizontal part (14) integrally form a horizontally placed "U" shape, and the second vertical part (15), the horizontal torsion part (16) and the third vertical part (17) integrally form a "U" shape; the torsion force generated by the vertical torsion part (13) provides vertical correction force, and the torsion force generated by the horizontal torsion part (16) provides horizontal correction force;

[0010] The adjustment segment (4) is arranged with at least one small loop curve II, which is an elastic loop formed by winding the round wire; the round wire segment on one side of the small loop curve II close to the bidirectional composite force segment (3) in the plurality of small loop curves II is the third vertical part (17), and the round wire segment on the other side is the force arm II, and the round wire segments on both sides of the remaining small loop curves II are the force arms II; the force arm II is connected with the third vertical part (17) and receives the horizontal and vertical correction force from the bidirectional composite force segment; the force arm II of the small loop curve II close to the bidirectional composite force segment (3) is arranged at a right angle between the third vertical part (17);

[0011] The distal end of the adjustment segment (4) is a free end, and the free end of the adjustment segment (4) is semi-fixed on the fixed connecting member of the target molar after being reversely forced, and the free end of the fourth force arm can slide in the mesial and distal directions on the fixed connecting member; the third elastic loop generates vertical force on the target molar through the free end of the fourth force arm.

[0012] Further, the free end of the fixed segment (1) is provided with a hook (5), which is fixedly connected with the anchorage located in the premolar area.

[0013] Further, the anchorage is a micro-implant (20).

[0014] Further, the elastic segment (2) is arranged with two small loop curves I, which are respectively a first elastic loop (7) and a second elastic loop (9). The square wire segment at the mesial end of the first elastic loop (7) is a first force arm (6). The square wire segment between the first elastic loop (7) and the second elastic loop (9) is a second force arm (8). The square wire segment at the distal end of the second elastic loop (9) is a third force arm (10). The angles between the first force arm (6), the second force arm (8) and the third force arm (10) are adjusted to realize the height adjustment of the elastic segment. The first elastic loop (7) and the second elastic loop (9) comprise one or more annular loop curves. The multiple annular loop curves are arranged side by side to make the elastic loop have a certain width.

[0015] Further, the distance between the end of the first horizontal part (12) away from the vertical torsion part (13) and the end of the second horizontal part (14) away from the vertical torsion part (13) is L1. The distance between the end of the first horizontal part (12) connected with the vertical torsion part (13) and the end of the second horizontal part (14) connected with the vertical torsion part (13) is L2. When the orthodontic device is in the unused state, L1 is equal to L2 in the side view angle. The first horizontal part (12), the vertical torsion part (13) and the second horizontal part (14) as a whole present a horizontally placed "U" shape.

[0016] The horizontal distance between the end of the second vertical part (15) away from the horizontal torsion part (16) and the end of the third vertical part (17) away from the horizontal torsion part (16) is L3. The distance between the end of the second vertical part (15) connected with the horizontal torsion part (16) and the end of the third vertical part (17) connected with the horizontal torsion part (16) is L4. L3 is equal to L4 in the side view angle. The second vertical part (15), the horizontal torsion part (16) and the third vertical part (17) as a whole present a "U" shape.

[0017] In the using state, the bending orthodontic device increases or reduces the distance between the first horizontal part (12) and the second horizontal part (14), L1 is greater than or less than L2, under the torsion of the vertical torsion part (13), the opposite or opposite forces are generated between the first horizontal part (12) and the second horizontal part (14), the target molar is driven to move in the downward or upward direction, that is, the vertical torsion part (13) generates the vertical correction force, and the vertical control of the target molar is realized; under the premise that the horizontal torsion part (16), the second vertical part (15) and the third vertical part (17) are not bent, the distance between the second vertical part (15) and the third vertical part (17) is increased by external force, L3 is greater than L4, under the action of the horizontal torsion part (16), the opposite forces are generated between the second vertical part (15) and the third vertical part (17), the target molar is driven to move in the mesial direction, that is, the horizontal torsion part (16) generates the mesial correction force.

[0018] Further, when the number of the vertical+horizontal composite curves is two, the two vertical+horizontal composite curves are arranged in parallel and staggered; the vertical torsion part (13) and the horizontal torsion part (16) on the vertical+horizontal composite curve can be bent into at least one annular ring curve, so that the vertical torsion part (13) and the horizontal torsion part (16) generate more sustained and gentle torsion.

[0019] Further, the square wire is an orthodontic stainless steel square wire or an orthodontic TMA square wire.

[0020] The second aspect of the application provides a correction method of the orthodontic device for vertically and mesially moving the molar and vertically controlling the molar, which comprises the following steps:

[0021] Step 1, the steel wire is bent into a fixed segment, an elastic segment, a bidirectional composite force applying segment and an adjusting segment connected in sequence; the elastic segment is bent into at least one small circle curve I, the two small circle curves I are a first elastic ring and a second elastic ring respectively, and the first elastic ring and the second elastic ring each include at least one annular ring curve; the bidirectional composite force applying segment is bent into at least one vertical+horizontal composite curve; the vertical+horizontal composite curve includes a first vertical part, a first horizontal part, a vertical torsion part, a second horizontal part, a second vertical part, a horizontal torsion part and a third vertical part; the vertical torsion part and the horizontal torsion part can be bent into at least one annular ring curve; the first vertical part is connected with the third force arm; the adjusting segment is arranged with at least one small circle curve II, which is a third elastic ring, and the third vertical part and the fourth force arm on the two sides of the third elastic ring; the third elastic ring is at least one annular ring curve; the fourth force arm is connected with the third vertical part; the fourth force arm and the third vertical part are arranged at right angles;

[0022] Step 2, the free end of the fixed segment is fixedly connected with the anchorage located in the premolar area;

[0023] Step 3, the free end of the fourth force arm is semi-fixed on the fixed connector of the target molar after being reversely forced, and the free end of the fourth force arm can slide in the mesial and distal directions on the fixed connector; the third elastic ring generates a vertical force on the target molar through the free end of the fourth force arm;

[0024] Step 4, after the fixing of the round wire is completed, the first vertical part and the third vertical part passively move away, and the horizontal torsion part generates a torsion force pointing to the mesial direction;

[0025] Step 5, the first horizontal part and the second horizontal part move away from or close to each other, and the vertical torsion part generates a torsion force pointing to the vertical direction.

[0026] Further, in step 1, the elastic segment is bent into two small circle curves I, and the two small circle curves I are arranged in a staggered manner.

[0027] Further, in step 1, the bidirectional composite force applying segment is bent into at least one vertical+horizontal composite curve, and if it is bent into two vertical+horizontal composite curves, the two vertical+horizontal composite curves are parallel and arranged in a staggered manner; in step 1, the free end of the fixed segment is provided with a hook, and the anchorage in the premolar area is a micro-implant, and the hook of the fixed segment is fixedly connected to the micro-implant located in the premolar area.

[0028] The orthodontic device of the present application not only provides continuous vertical correction force, but also provides mesial movement and vertical correction force, so that the molar can be moved vertically and mesially at the same time and be controlled vertically, reduces the chair-side operation time, shortens the treatment period, and improves the patient's comfort. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0030] Figure 2 is a use state diagram of an embodiment of the present application.

[0031] Figure 3 is a use state diagram of an embodiment of the present application. Figure 1 is a use state diagram of an embodiment of the present application.

[0032] 1-fixed section; 2-elastic section; 3-bidirectional composite force applying section; 4-adjusting section; 5-hook; 6-first force arm; 7-first elastic ring; 8-second force arm; 9-second elastic ring; 10-third force arm; 11-first vertical part; 12-first horizontal part; 13-perpendicular torsion part; 14-second horizontal part; 15-second vertical part; 16-horizontal torsion part; 17-third vertical part; 18-third elastic ring; 19-fourth force arm; 20-micro-implant; 21-first premolar; 22-second premolar; 23-first molar; 24-retained molar; 25-fixed connecting piece. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" appear only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Embodiment one

[0037] Reference Figure 1 , Figure 1 The structure schematic diagram of the vertical, mesial moving molar and orthodontic device capable of vertical control provided by the embodiment of the present application is shown in the figure. Figure 1As shown, the vertical, mesial moving molar and vertically controllable orthodontic device is made of a steel wire bending, including sequentially connected fixed segment 1, elastic segment 2, bidirectional composite force segment 3 and adjustment segment 4. Preferably, the steel wire in the embodiment is selected from orthodontic stainless steel square wire, i.e. rectangular cross-section stainless steel wire.

[0038] The fixed segment 1 is used for fixing one end of the orthodontic device to the anchorage in the premolar area. Figure 1 In the preferred embodiment shown, the free end of the fixed segment 1 is fixedly connected with the anchorage in the premolar area. The fixed segment 1 can be connected with the anchorage in various ways, and in each preferred embodiment, the embodiment of the application preferably provides a hook 5 at the free end of the fixed segment 1, which is fixedly connected with the anchorage in the premolar area through the hook 5. The hook 5 is easy to make and easy to clean, and is planted into the mouth without food residues and the like, which is beneficial to oral hygiene.

[0039] As a preferred embodiment, the anchorage in the embodiment of the application is selected from micro-implant 20. As the anchorage, the anchorage unit does not involve the tooth, and the orthodontic force acting on the molar is all released on the implant, without anchorage loss, and can more efficiently move the molar than the traditional anchorage. At the same time, the micro-implant also has the advantages of small volume and flexible implantation position.

[0040] The elastic segment 2 increases the elasticity of the orthodontic device; in Figure 1 In the preferred embodiment shown, the elastic segment 2 is arranged with two small circle curves I, which are respectively a first elastic circle 7 and a second elastic circle 9, so as to increase the elasticity of the orthodontic device and achieve light force correction; in addition, the elastic segment 2 further includes a first force arm 6, a second force arm 8 and a third force arm 10 located on both sides of the first elastic circle 7 and the second elastic circle 9, and the angle between the first force arm 6, the second force arm 8 and the third force arm 10 is adjusted to realize the height adjustment of the elastic segment.

[0041] The first elastic circle 7 and the second elastic circle 9 each include at least one annular circle curve. In order to provide continuous torsional force for the first elastic circle 7 and the second elastic circle 9, the first elastic circle 7 and the second elastic circle 9 preferably include 1-2 annular circle curves. The 1-2 annular circle curves arranged side by side have a certain width, and the elastic segment 2 of the orthodontic device in the embodiment of the application includes the first elastic circle 7 and the second elastic circle 9. If the first elastic circle 7 and the second elastic circle 9 are arranged in parallel, the elastic segment 2 will have a relatively wide width. For patients with buccal muscle tension and low elasticity of buccal mucosa, if the width of the elastic circle is too wide, the patient's experience will be poor in the case of wearing the orthodontic device for a long time. Therefore, the two elastic circles in the embodiment of the application can be arranged in parallel and staggered when bending.

[0042] The bidirectional composite force segment 3 can generate orthodontic force in the mesial direction and the vertical direction. In Figure 1In the preferred embodiment shown, the bidirectional composite force application section 3 is arranged with at least one vertical-horizontal composite curve. The vertical-horizontal composite curve comprises a first vertical portion 11, a first horizontal portion 12, a vertical torsion portion 13, a second horizontal portion 14, a second vertical portion 15, a horizontal torsion portion 16 and a third vertical portion 17. In the above structure, the distance between the end of the first horizontal portion 12 away from the vertical torsion portion 13 and the end of the second horizontal portion 14 away from the vertical torsion portion 13 is L1, the distance between the end of the first horizontal portion 12 connecting the vertical torsion portion 13 and the end of the second horizontal portion 14 connecting the vertical torsion portion 13 is L2, and L1 is equal to L2 when viewed from the side, and the horizontal section is similar to a "U" shape laid sideways. Similarly, the distance between the end of the second vertical portion 15 away from the horizontal torsion portion 16 and the end of the third vertical portion 17 away from the horizontal torsion portion 16 is L3, the distance between the end of the second vertical portion 15 connecting the horizontal torsion portion 16 and the end of the third vertical portion 17 connecting the horizontal torsion portion 16 is L4, and L3 is equal to L4 when viewed from the side, and the vertical section is similar to a "U" shape.

[0043] When the orthodontic device is in use, the orthodontic device is bent to increase or decrease the distance between the first horizontal portion 12 and the second horizontal portion 14, which is specifically manifested by L1 being greater than or less than L2, and under the action of the torsion of the vertical torsion portion 13, the first horizontal portion 12 and the second horizontal portion 14 generate opposite or opposite forces, which can drive the target molar to move in the downward or upward direction, i.e., the vertical torsion portion 13 generates a vertical correction force to achieve vertical control of the target molar. Under the premise of not bending the horizontal torsion portion 16, the second vertical portion 15 and the third vertical portion 17, the distance between the second vertical portion 15 and the third vertical portion 17 is increased by external force, which is specifically manifested by L3 being greater than L4, and under the action of the horizontal torsion portion 16, the second vertical portion 15 and the third vertical portion 17 generate opposite forces, which can drive the target molar to move in the mesial direction, i.e., the horizontal torsion portion 16 generates a mesial correction force.

[0044] When the number of vertical-horizontal composite curves is two, the two vertical-horizontal composite curves are arranged in parallel and staggered, similar to the first elastic ring 7 and the second elastic ring 9. In the above implementation process, the vertical torsion portion 13 and the horizontal torsion portion 16 on the vertical-horizontal composite curve can be bent into a ring-shaped ring curve comprising at least one ring, so that the vertical torsion portion 13 and the horizontal torsion portion 16 generate more sustained and gentle torsion. The preferred scheme of the vertical torsion portion 13 and the horizontal torsion portion 16 is a "U" shape.

[0045] The adjustment section 4 is used to provide a correction force for verticalizing the molar. In the preferred embodiment shown, the adjustment section 4 is arranged with at least one vertical adjustment curve. The vertical adjustment curve comprises a first vertical portion 21, a first horizontal portion 22, a vertical torsion portion 23, a second horizontal portion 24, a second vertical portion 25 and a third vertical portion 26. In the above structure, the distance between the end of the first horizontal portion 22 away from the vertical torsion portion 23 and the end of the second horizontal portion 24 away from the vertical torsion portion 23 is L5, the distance between the end of the first horizontal portion 22 connecting the vertical torsion portion 23 and the end of the second horizontal portion 24 connecting the vertical torsion portion 23 is L6, and L5 is equal to L6 when viewed from the side, and the horizontal section is similar to a "U" shape laid sideways. Similarly, the distance between the end of the second vertical portion 25 away from the vertical torsion portion 23 and the end of the third vertical portion 26 away from the vertical torsion portion 23 is L7, the distance between the end of the second vertical portion 25 connecting the vertical torsion portion 23 and the end of the third vertical portion 26 connecting the vertical torsion portion 23 is L8, and L7 is equal to L8 when viewed from the side, and the vertical section is similar to a "U" shape. Figure 1In the preferred embodiment shown, the adjustment section 4 includes a third elastic ring 18 and a fourth lever arm 19 and a third vertical portion 17 located on both sides of the third elastic ring 18; the fourth lever arm 19 is connected to the third vertical portion 17 and receives horizontal and vertical corrective forces from the bidirectional composite force application section; the fourth lever arm 19 and the third vertical portion 17 are arranged at right angles.

[0046] The free end of the fourth lever arm 19 is partially fixed to the fixed connector 25 of the target molar after being subjected to a reverse force. Exemplarily, the fixed connector 25 of the target molar can be a buccal tube, which is fixed to the buccal side of the target molar. In implementing the orthodontic device of this embodiment, the free end of the fourth lever arm 19 is partially fixed inside the buccal tube on the buccal side of the target molar after being subjected to a reverse force. The cross-sections of both the wire and the buccal tube in the orthodontic device of this application are rectangular, the purpose of which is to prevent the wire from rotating inside the buccal tube. However, since the cross-sectional shapes of the wire and the buccal tube are the same, the free end of the fourth lever arm 19 can slide mesially and distally within the buccal tube. This structural design provides a basis for the fourth lever arm 19 to continuously move the target molar mesially.

[0047] In the implementation of this orthodontic appliance, the free end of the fourth lever arm 19 is semi-fixedly connected to the fixed connector 25 of the target molar, and the fixed segment 1 is located below the micro implant 20 when the orthodontic appliance is not applying force. Figure 2 (The dotted part) is fixed on the micro implant 20 when force is applied. Since the orthodontic device in this embodiment is made of a steel wire, the fourth lever arm 19 receives torque from the bidirectional compound force application section 3 and the elastic section 2, generating an orthodontic force that makes the impacted molar 24 vertical.

[0048] The third elastic ring 18, similar to the first elastic ring 7 and the second elastic ring 9, includes at least one annular loop. To provide continuous and gentle torque, the third elastic ring 18 preferably includes one or two annular loops. The fourth lever arm 19 connects to the third vertical portion 17 and receives horizontal and vertical orthodontic forces from the bidirectional compound force application segment 3. When the fourth lever arm 19 is moved mesially by the force applied by the third vertical portion 17, the angle between the fourth lever arm 19 and the third vertical portion 17 decreases. The third elastic ring 18 generates a vertical force on the target molar through the free end of the fourth lever arm 19, which can resist the mesial tilting tendency caused by the mesial movement of the impacted molar 24.

[0049] When placing orthodontic appliances, individual differences exist among patients regarding buccal space, buccal alveolar ridge morphology, buccal-lingual position of impacted molar 24, and the protrusion of the micro-implant 20 exposed in the mouth. Based on clinical practice, after placement in the mouth, the orthodontic appliance may obstruct the buccal teeth or oral mucosa when viewed from the occlusal view, or the free end of the fourth lever arm 19 may not conform to the buccal side of impacted molar 24, affecting the clinical use of the orthodontic appliance and the patient's experience. Therefore, in actual bending, the orthodontic appliance of this application may require buccal-lingual "abduction" and / or "extension" on the first lever arm 6, second lever arm 8, third lever arm 10, and fourth lever arm 19. Simultaneously, the first elastic band 7, second elastic band 9, and third elastic band 18 can be arranged parallel and / or staggered according to the actual situation. This arrangement allows the orthodontic appliance to better conform to the patient's intraoral condition, increasing the patient's experience.

[0050] The working principle of the orthodontic device described in this embodiment will be explained below:

[0051] Determine the distance between the impacted molar 24 and the micro-implant 20, and select the corresponding number of elastic coils and a vertical + horizontal compound curve orthodontic appliance. Based on the patient's buccal space, alveolar ridge buccal morphology, buccal-lingual position of the impacted molar 24, and the protrusion of the micro-implant 20 exposed in the mouth, bend the first lever arm 6, second lever arm 8, third lever arm 10, and fourth lever arm 19 to create buccal-lingual "abduction" and / or "extension," and select the corresponding number of elastic coils and arrange them appropriately. Place the orthodontic appliance, inserting the free end of the fourth lever arm 19 into the buccal tube of the molar. When the orthodontic appliance is not under force, the fixed segment 1 is located below the micro-implant 20. Figure 2 As shown by the dotted lines, the device is fixed to the micro-implant 20 during force application. Since the orthodontic appliance in this embodiment is made of a single bent wire, the fourth lever arm 19 receives torque from the bidirectional composite force application section 3 and the elastic section 2, generating an orthodontic force that verticalizes the impacted molar 24. Furthermore, reducing the distance between the fourth lever arm 19 and the third vertical section 17 decreases the pre-bending angle between them. Because the free end of the fourth lever arm 19 is inserted into the buccal tube of the molar, the free end of the fourth lever arm 19 can provide additional vertical orthodontic force to the molar, facilitating personalized adjustments based on actual clinical conditions. Figure 3 As shown.

[0052] After the orthodontic appliance is fixed at both ends, orthodontic ligatures are used to pull and fix the buccal canal of the target molar to the third elastic coil 18. Shortening the length of the ligature passively increases the horizontal distance between the end of the second vertical section 15 furthest from the horizontal torsion section 16 and the end of the third vertical section 17 furthest from the horizontal torsion section 16. Figure 3 As shown.

[0053] The fourth force arm 19 has the same cross-sectional shape as the buccal tube, so the free end of the fourth force arm 19 can slide in the buccal tube in the mesial and distal directions. The second vertical portion 15 and the third vertical portion 17 are passively distanced. The horizontal torsion portion 16 generates a mesial torsion, which is transmitted to the target molar in the mesial direction through the third vertical portion 17, the third elastic portion 18, and the force transmission of the fourth force arm 19 in the mesial direction, so as to implement a mesial correction force on the target molar. Exemplarily, the present application can adjust the distance between the second vertical portion 15 and the third vertical portion 17 by adjusting the length of the ligation wire, so as to adjust the torsion generated by the horizontal torsion portion 16 in the mesial direction, as shown in Figure 3 .

[0054] The pre-bent orthodontic device distances or approaches the distance between the end of the first horizontal portion 12 distanced from the vertical torsion portion 13 and the end of the second horizontal portion 14 distanced from the vertical torsion portion 13, and the vertical torsion portion 13 generates a torque for intrusion or elongation, which is transmitted to the target molar in the vertical direction through the second horizontal portion 14, the second vertical portion 15, the horizontal torsion portion 16, the third vertical portion 17, the third elastic portion 18, and the force transmission of the fourth force arm 19 in the vertical direction, so as to implement a vertical correction force on the target molar, as shown in Figure 3 .

[0055] It can be known from the above solutions that the orthodontic device in the present application not only provides continuous vertical and mesial movement correction forces, but also provides a vertical correction force, so that the molar simultaneously realizes vertical, mesial movement, and vertical control, reduces chair-side operation time, shortens the treatment period, and improves patient comfort.

[0056] Embodiment Two

[0057] A corresponding correction method based on the orthodontic device provided in Embodiment One. The correction method comprises the following steps:

[0058] Step 1, the steel wire is bent into a fixed segment 1, an elastic segment 2, a bidirectional composite force applying segment 3, and an adjusting segment 4 connected in sequence.

[0059] The elastic segment 2 is bent into at least one small circle, generally two small circles, which are a first elastic circle and a second elastic circle. The elastic segment 2 comprises a first force arm 6, a first elastic circle 7, a second force arm 8, a second elastic circle 9, and a third force arm 10, as shown in Figure 1 .

[0060] The bidirectional composite force applying segment 3 is bent into at least one vertical + horizontal composite curve, which comprises a first vertical portion 11, a first horizontal portion 12, a vertical torsion portion 13, a second horizontal portion 14, a second vertical portion 15, a horizontal torsion portion 16, and a third vertical portion 17, as shown in Figure 1 .

[0061] The adjustment section 4 is bent at least one small circle into a third elastic circle, including a third elastic circle 3 and a fourth force arm 19 as shown. Figure 1 The fourth force arm 19 is connected with the third vertical part 17 and is arranged at a right angle.

[0062] Step 2, the free end of the fixed section 1 is fixedly connected with the anchorage located in the premolar area through the hook 5.

[0063] Step 3, the free end of the fourth force arm 19 is semi-fixed on the fixed connecting member of the target molar after being reversely forced, and the connecting member is preferably a buccal tube arranged on the buccal side of the molar.

[0064] Step 4, after the steel wire is fixed, the fourth force arm 19 receives the torsion force from the bidirectional composite force section 3 and the elastic section 2 due to the deformation of the orthodontic device, generates the upright correction force for the impacted molar 24, and transmits the upright correction force to the target molar to make the molar upright. In addition, the pre-bending angle between the fourth force arm 19 and the third vertical part 17 is reduced, which can further make the molar upright, and individual adjustment is made according to the actual situation.

[0065] The orthodontic ligation wire pulls and fixes the buccal tube of the target molar and the third elastic circle 18. The second vertical part 15 and the third vertical part 17 are passively away (the horizontal torsion part needs to be passively away from the first vertical part and the third vertical part by using external force without bending, so as to generate the mesial direction torsion force) by shortening the length of the ligation wire. The horizontal torsion part 16 generates the mesial direction torsion force, and the mesial direction torsion force is transmitted to the target molar to make the molar move mesially.

[0066] Step 5, the orthodontic device is pre-bent to make the first horizontal part 12 and the second horizontal part 14 away or close, and the vertical torsion part 13 generates the intrusion or elongation torsion force, which is transmitted to the target molar to control the molar vertically.

[0067] The sizes of the vertical direction correction force, the mesial direction correction force and the vertical direction correction force in the correction method described in the embodiments of the present application can be realized by adjusting the distances between the third vertical part 17 and the fourth force arm 19, the first horizontal part 12 and the second horizontal part 14, and the second vertical part 15 and the third vertical part 17.

[0068] The content described in the embodiments of the present application is only a list of implementation forms of the inventive concept, and the protection scope of the present application should not be regarded as being limited to the specific forms described in the embodiments, and the protection scope of the present application also includes the equivalent technical means that can be thought by those skilled in the art according to the inventive concept.

Claims

1. An orthodontic appliance for vertically and mesially moving molars with vertical control, the appliance being positioned between the patient's impacted molar (24) and premolar region, with the end of the appliance facing the impacted molar (24) as the distal direction and the end of the appliance facing the premolar region as the mesial direction; characterized in that: The orthodontic device is made of bent square wire and includes a fixed section (1), an elastic section (2), a bidirectional composite force application section (3), and an adjustment section (4) connected sequentially from mesial to distal. The mesial end of the fixed segment (1) is a free end, and the free end of the fixed segment (1) is fixedly connected to the anchorage in the premolar region; The elastic segment (2) is arranged with at least one small loop I, which is an elastic loop made of square wire. The square wire segments on both sides of the small loop I are lever arms I. The small loop I increases the elasticity of the orthodontic device, and the height of the elastic segment (2) can be adjusted by adjusting the angle between the lever arms I. The bidirectional composite force application section (3) is arranged with at least one vertical + horizontal composite curve, which includes a first vertical part (11), a first horizontal part (12), a vertical torsional part (13), a second horizontal part (14), a second vertical part (15), a horizontal torsional part (16), and a third vertical part (17) connected in sequence; the first horizontal part (12), the vertical torsional part (13), and the second horizontal part (14) are generally arranged in a horizontal "U" shape, and the second vertical part (15), the horizontal torsional part (16), and the third vertical part (17) are generally arranged in a "U" shape; the torque generated by the vertical torsional part (13) provides a vertical corrective force, and the torque generated by the horizontal torsional part (16) provides a horizontal corrective force; The adjustment section (4) is arranged with at least one small loop II, which is an elastic loop made of square wire; among the multiple small loop II, the square wire segment on one side of the small loop II closest to the bidirectional composite force application section (3) is the third vertical part (17), and the square wire segment on the other side is the lever arm II, and the square wire segments on both sides of the remaining small loop II are lever arms II; the lever arm II is connected to the third vertical part (17) and receives the horizontal and vertical corrective forces from the bidirectional composite force application section; the lever arm II of the small loop II closest to the bidirectional composite force application section (3) is set at a right angle to the third vertical part (17); The distal end of the adjustment segment (4) is a free end. After the free end of the adjustment segment (4) is subjected to reverse force, it is partially fixed on the fixed connector (25) of the target molar. The free end of the fourth lever arm (19) can slide in the mesial and distal directions on the fixed connector. The third elastic ring (18) generates a vertical force on the target molar through the free end of the fourth lever arm (19).

2. The orthodontic device for vertically and mesially moving molars with vertical control as described in claim 1, characterized in that: A hook (5) is provided at the free end of the fixed segment (1), and the hook (5) is fixedly connected to the anchorage in the premolar area.

3. The orthodontic device for vertically and mesially moving molars with vertical control as described in claim 3, characterized in that: The anchorage is a micro-implant (20).

4. The orthodontic device for vertically and mesially moving molars with vertical control as described in claim 1, characterized in that: The elastic segment (2) is arranged with two small loops I, which are the first elastic ring (7) and the second elastic ring (9), respectively. The square wire segment near the middle of the first elastic ring (7) is the first lever arm (6), the square wire segment between the first elastic ring (7) and the second elastic ring (9) is the second lever arm (8), and the square wire segment far from the middle of the second elastic ring (9) is the third lever arm (10). The height of the elastic segment can be adjusted by adjusting the angle between the first lever arm (6), the second lever arm (8) and the third lever arm (10). The first elastic ring (7) and the second elastic ring (9) include one or more annular loops. The multiple annular loops are arranged side by side to make the elastic ring have a certain width.

5. The orthodontic device for vertically and mesially moving molars with vertical control as described in claim 1, characterized in that: The distance between the end of the first horizontal part (12) away from the vertical torque part (13) and the end of the second horizontal part (14) away from the vertical torque part (13) is L1. The distance between the end of the first horizontal part (12) connected to the vertical torque part (13) and the end of the second horizontal part (14) connected to the vertical torque part (13) is L2. When the orthodontic device is not in use, when viewed from the side, L1 is equal to L2. The first horizontal part (12), the vertical torque part (13) and the second horizontal part (14) are in a horizontal "U" shape. The horizontal distance between the end of the second vertical section (15) away from the horizontal torsion section (16) and the end of the third vertical section (17) away from the horizontal torsion section (16) is L3. The distance between the end of the second vertical section (15) connected to the horizontal torsion section (16) and the end of the third vertical section (17) connected to the horizontal torsion section (16) is L4. When viewed from the side, L3 equals L4. The second vertical section (15), the horizontal torsion section (16) and the third vertical section (17) are in the shape of a "U". When in use, bending the orthodontic device increases or decreases the distance between the first horizontal part (12) and the second horizontal part (14), with L1 being greater than or less than L2. Under the torque of the vertical torque part (13), the first horizontal part (12) and the second horizontal part (14) generate opposite or opposing forces, causing the target molar to move downward or upward. That is, the vertical torque part (13) generates a vertical orthodontic force, achieving vertical control of the target molar. Without bending the horizontal torque part (16), the second vertical part (15), and the third vertical part (17), the distance between the second vertical part (15) and the third vertical part (17) is increased by external force, with L3 being greater than L4. Under the force of the horizontal torque part (16), the second vertical part (15) and the third vertical part (17) generate opposing forces, causing the target molar to move in the mesial direction. That is, the horizontal torque part (16) generates a mesial orthodontic force.

6. The orthodontic device for vertically and mesially moving molars with vertical control as described in claim 5, characterized in that: When there are two vertical + horizontal composite curves, the two vertical + horizontal composite curves are arranged in parallel and staggered order; the vertical torsional part (13) and the horizontal torsional part (16) on the vertical + horizontal composite curve can be bent into at least one annular loop, so that the vertical torsional part (13) and the horizontal torsional part (16) generate more continuous and gentler torque.

7. The orthodontic device for vertically and mesially moving molars with vertical control as described in claim 6, characterized in that: The square wire is an orthodontic stainless steel square wire or an orthodontic TMA square wire.

8. A correction method based on the orthodontic appliance of any one of claims 1-7, which allows for vertical, mesial movement of molars and vertical control, characterized in that... Includes the following steps: Step 1: Bend the steel wire into a fixed section, an elastic section, a bidirectional composite force-applying section, and an adjusting section connected in sequence; the elastic section is bent into at least one small loop I, the two small loops I being the first elastic loop and the second elastic loop, and the two sides of the two elastic loops, from near to far, include a first lever arm, a second lever arm, and a third lever arm in sequence; the first elastic loop and the second elastic loop each include at least one annular loop; the bidirectional composite force-applying section is bent into at least one vertical + horizontal composite curve; the vertical + horizontal composite curve includes a first vertical part, The structure comprises a first horizontal section, a vertical torsional section, a second horizontal section, a second vertical section, a horizontal torsional section, and a third vertical section; the vertical torsional section and the horizontal torsional section can be bent into at least one annular loop; the first vertical section is connected to a third lever arm; the adjustment section is provided with at least one small loop II, which is a third elastic ring, and a third vertical section and a fourth lever arm on both sides of the third elastic ring; the third elastic ring is an annular loop including at least one ring; the fourth lever arm is connected to the third vertical section; the fourth lever arm and the third vertical section are arranged at a right angle; Step 2: Connect the free end of the fixed segment to the anchorage located in the premolar region; Step 3: After the free end of the fourth lever arm is subjected to a reverse force, it is partially fixed to the fixed connector of the target molar, and the free end of the fourth lever arm can slide in the mesial and distal directions on the fixed connector; the third elastic ring exerts a vertical force on the target molar through the free end of the fourth lever arm. Step 4: After the square wire is fixed, the first vertical part and the third vertical part are passively moved away from each other, and the horizontal torsional part generates a torsional force pointing towards the center. Step 5: Move the first horizontal part and the second horizontal part away from each other or closer together, and the vertical torque part generates a torque pointing in the vertical direction.

9. The orthodontic method of the vertically and mesially movable molars with vertically controllable orthodontic appliance as described in claim 8, characterized in that: In step 1, the elastic segment bends into two small loops I, and the two small loops I are staggered.

10. The orthodontic method of the vertically and mesially moving molars with vertical control as described in claim 8, characterized in that: In step 1, the bidirectional composite force application segment is bent into at least one vertical + horizontal composite curve. If it is bent into two vertical + horizontal composite curves, the two vertical + horizontal composite curves are arranged in parallel and staggered positions. In step 1, the free end of the fixed segment is provided with a hook, and the anchorage of the premolar region is a micro implant. The hook of the fixed segment is fixedly connected to the micro implant located in the premolar region.

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