Children tooth reverse jaw corrector and manufacturing method thereof

Abstract

The invention discloses an orthodontic device for child tooth reverse jaw. The orthodontic device comprises a nickel-titanium dental arch wire of an upper tooth, a steel wire dental arch wire of a lower tooth, two upper bands, two lower bands, two rubber bands and a plurality of brackets, u-shaped springs are welded to the two portions close to the ends, and two traction hooks are arranged on the front portion. The upper band ring is sleeved on the six-age teeth of the upper teeth, the traction hook is positioned at the upper part of the buccal tube, and the lower band ring is sleeved on the six-age teeth of the lower teeth; the brackets are adhered to reverse jaw teeth of the upper teeth and four anterior teeth of the lower teeth; the nickel-titanium dental arch wire and the steel wire dental arch wire are bound in a plurality of brackets; two ends of the nickel-titanium dental arch wire penetrate into the buccal tube with the upper band ring; the two ends of the rubber bands hook and pull the upper belt ring traction hook and the steel wire tooth arch wire traction hook on the same side, and the two rubber bands conduct traction in an inverted splayed shape. According to the orthodontic device for child tooth reverse jaw, an occlusal pad does not need to be added to open jaw biting, early treatment can be conducted on child tooth reverse jaw, installation is convenient, obvious pain and foreign body sensation are almost avoided, the reverse jaw relieving time is short, and child pain is small; the correction quality is good.

Description

Technical Field

[0001] The present invention relates to the technical field of a corrector for children's dental crossbite and a manufacturing method thereof, and in particular to a corrector for children's dental crossbite and a manufacturing method thereof. Background Art

[0002] Crossbite is commonly known as "underbite" or "underbite". It is a common type of dental deformity. It has a great impact on children's chewing function and the development of teeth and jaws. If the deformity is not treated in time after it occurs, it will become more and more serious with age, causing the mandible to protrude and the middle part of the face to be sunken, greatly affecting the beauty of the face. Nowadays, many parents use folk remedies such as biting chopsticks and bamboo skin to correct their children's crossbite. Some children may be cured by luck, but most children often have the opposite effect. Instead of correcting the deformity, they develop some bad habits, which also increases the difficulty of scientific correction. According to the characteristics of children's physical development, when girls are 6-8 years old and boys are 7-9 years old, the upper incisors have just erupted, (two or one) when the crossbite first appears, the child's jaw has just entered the peak of development. This is the best time (golden period) for correction. If the appropriate braces can be worn in time, the teeth can follow the traction of the braces to quickly relieve the crossbite. Timely resolution of the crossbite relationship can quickly achieve the goal of restricting the development of the mandible and promoting the development of the maxilla, and the dental crossbite will not develop into a skeletal crossbite.

[0003] At present, there are three types of correctors commonly used for early correction of crossbite: jaw pad push spring corrector, functional corrector and front traction device. The three correctors are highly targeted and need to be divided into tooth, bone and functional before they can be worn. They all need to add pads and open the bite. The common disadvantages are large size, strong force, too fast force decay rate, uneven force, strong foreign body sensation and pain, which are difficult for children to bear. In addition, the manufacturing process is complicated, it is not convenient to install, the wearing time is long, and the time to relieve the crossbite is uncertain, the shortest time is about 3 to 6 months, and the longest time is one to two years. Moreover, the correction effect cannot be guaranteed, and the tooth crossbite cannot be relieved in time at the best time when the incisors erupt. Summary of the invention

[0004] The purpose of the present invention is to provide a corrective appliance for children's dental crossbite and a manufacturing method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The invention discloses a corrector for children's dental crossbite, comprising a nickel-titanium dental arch wire for upper teeth, a steel dental arch wire for lower teeth, two upper bands, two lower bands, two rubber bands and a plurality of brackets;

[0007] The nickel-titanium dental arch wire is U-shaped, and U-shaped springs are welded at both ends. The steel dental arch wire is U-shaped, and a first traction hook and a second traction hook are arranged on the left and right front parts. The upper belt ring is provided with a buccal tube, and the left and right buccal tubes are provided with a third traction hook and a fourth traction hook;

[0008] The upper band ring is sleeved on the sixth molar of the upper teeth, and the third traction hook and the fourth traction hook are located on the upper part of the buccal tube, and the lower band ring is sleeved on the sixth molar of the lower teeth; the brackets are glued to the upper crossbite teeth and the four front teeth of the lower teeth; the nickel-titanium dental arch wire and the steel wire dental arch wire are both tied in a number of brackets, and the two ends of the nickel-titanium dental arch wire are passed through the buccal tube of the upper band ring, the U-shaped spring opening faces downward, the end of the U-shaped spring close to the buccal tube is the active end, and the end of the U-shaped spring away from the buccal tube is the welding end, and the two ends of the steel wire dental arch wire are passed through the buccal tube of the lower band ring; the first traction hook and the second traction hook are close to the corresponding lateral incisor and face upward;

[0009] The rubber band hook on the left side pulls the first traction hook and the third traction hook, and the rubber band hook on the right side pulls the second traction hook and the fourth traction hook, and the two rubber bands are pulled in an inverted figure eight shape.

[0010] As an improvement, the diameter of the nickel-titanium dental arch wire is 0.016 or 0.018 or 0.020 inches, and the diameter of the steel wire dental arch wire is 0.016 inches.

[0011] As an improvement, the width of the nickel-titanium arch wire and the steel arch wire are both 3-4.2 cm.

[0012] As an improvement, the movable end of the U-shaped spring is provided with a ring, and the nickel-titanium dental arch wire passes through the ring.

[0013] As an improvement, the U-shaped spring has a diameter of 0.5 mm, a height of 0.5 cm, and a width of 0.6 cm, and is made of steel wire.

[0014] As an improvement, the tension of the rubber band is 140-150g.

[0015] A method for manufacturing a corrector for children's dental crossbite, comprising the following steps:

[0016] Step 1: Make a dental model for children with crossbite correction, put two upper band rings on the two sixth-year teeth on the upper teeth of the dental model, and put two lower band rings on the two sixth-year teeth on the lower teeth of the dental model, with the buccal tubes of the two band rings facing outwards, and the third traction hook and the fourth traction hook of the left and right upper band rings are both on the upper part of the buccal tubes;

[0017] Step 2, select a nickel-titanium wire, make a matching U-shaped nickel-titanium arch wire according to the width of the upper dental arch of the tooth model, insert both ends of the nickel-titanium arch wire into the buccal tube, make the front end of the nickel-titanium arch wire arch out of the dental arch, and then cut the nickel-titanium arch wire from the rear end of the buccal tube;

[0018] Step 3, weld a U-shaped spring near the buccal tube of the nickel-titanium dental arch wire, with the opening of the U-shaped spring facing downward, the end of the U-shaped spring close to the buccal tube being the movable end, and the end of the U-shaped spring away from the buccal tube being the welding end;

[0019] Step 4: Select a steel wire, make a matching U-shaped steel wire arch wire according to the width of the lower dental arch of the tooth model, insert both ends of the steel wire arch wire into the buccal tube, make the front end of the steel wire arch wire stick to the teeth, and then cut the steel wire arch wire from the rear end of the buccal tube;

[0020] Step 5, welding the first traction hook and the second traction hook facing upwards near the left and right incisors of the wire arch wire;

[0021] Step 6: Put the two upper band rings on the two sixth-year teeth of the upper teeth of the child, and put the two lower band rings on the two sixth-year teeth of the lower teeth of the child, with the buccal tubes of the two band rings facing outwards, and the third traction hook and the fourth traction hook of the left and right upper band rings are both on the upper part of the buccal tubes;

[0022] Step 7: Glue brackets on the upper crossbite and the four front teeth of the lower teeth;

[0023] Step 8, insert the welded nickel-titanium dental arch wire into the buccal tube of the upper teeth, use a push-pull dynamometer to squeeze the front end of the nickel-titanium dental arch wire inward until it touches the teeth, and measure the resilience of the nickel-titanium dental arch wire. The resilience is required to be 160-190g. If it is not satisfied, move the movable end of the U-shaped spring for fine adjustment to change the distance between the front end of the nickel-titanium dental arch wire and the teeth until the measured resilience meets the requirements; if it still does not meet the requirements, discard and redo it;

[0024] Step 9: squeeze the front end of the nickel-titanium arch wire inward and tie it into the bracket of the crossbite;

[0025] Step 10: Insert both ends of the steel wire arch wire into the buccal tube of the lower teeth and tie them into the brackets on the four lower front teeth, with the first traction hook and the second traction hook facing upwards;

[0026] Step 11. Select two rubber bands. Use the left rubber band hook to pull the first and third traction hooks. Use the right rubber band hook to pull the second and fourth traction hooks. The two rubber bands are pulled in an inverted figure eight shape.

[0027] As an improvement, in step 2, the front end of the nickel-titanium dental arch wire protrudes 1-1.2 cm from the dental arch.

[0028] As an improvement, the rebound force requirement in step 8 is 180g.

[0029] Compared with the prior art, the advantages of the present invention are: the corrector for children's dental crossbite does not need to distinguish between dental, skeletal and functional crossbite, and is suitable for the early treatment of all children's dental crossbite. It does not need to add a pad to open the bite, and the crossbite is released by using the jaw-rest gap, which is equivalent to building a small frame for children's teeth at the best time. The resilience, memory and sustained release of the nickel-titanium dental arch wire and the leather ring are used to pull the teeth out to release the crossbite. The manufacturing process is simple, the installation is convenient, the position is easy, and there is no situation where it cannot be installed; the teeth are pulled out externally, which is easy to use force, and the resilience generated by the nickel-titanium dental arch wire is soft and long-lasting, with almost no obvious pain and foreign body sensation, so the time for releasing the crossbite is short and the pain of children is small; the correction quality is good and it is not easy to rebound. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings listed below are only some structural schematic diagrams of the present invention, not all of them.

[0031] Figure 1 The structure of a corrector for children's crossbite according to the present invention is shown in FIG. Figure 1 .

[0032] Figure 2 The structure of a corrector for children's crossbite according to the present invention is shown in FIG. Figure 2 .

[0033] Figure 3 The structure of a corrector for children's crossbite according to the present invention is shown in FIG. Figure 3 .

[0034] Figure 4 The present invention is a schematic structural diagram of a nickel-titanium dental arch wire of a corrector for children's dental crossbite.

[0035] Figure 5 The present invention is a side view of a nickel-titanium dental arch wire of a corrector for children's dental crossbite.

[0036] Figure 6 The present invention is a schematic structural diagram of a steel dental arch wire of a corrector for children's dental crossbite.

[0037] Figure 7 The present invention is a side view of a steel dental arch wire of a corrector for children's dental crossbite.

[0038] Figure 8 The present invention is a schematic structural diagram of a band ring of a corrector for children's underbite.

[0039] Reference numerals:

[0040] Nickel-titanium dental arch wire 1; bracket 2; first traction hook 3; rubber band 4; upper belt ring 5; steel wire dental arch wire 6; lower belt ring 7; buccal tube 8; U-shaped spring 9; collar 10; second traction hook 11; third traction hook 12; fourth traction hook 13. 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] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, if the terms "first", "second", "third", etc. appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance. If the terms "horizontal", "vertical", "overhanging", etc. appear, it does not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of the embodiments of the present invention, if the terms "multiple" or "several" appear, they represent at least two.

[0045] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] This embodiment combines the attached Figures 1 to 8 , a corrective appliance for children's dental crossbite and a method for making the same are described in detail.

[0047] The present embodiment is a corrector for a child's dental crossbite, comprising a nickel-titanium dental arch wire 1 for the upper teeth, a steel dental arch wire 6 for the lower teeth, two upper bands 5, two lower bands 7, two rubber bands 4 and a plurality of brackets 2;

[0048] The nickel-titanium dental arch wire 1 is U-shaped, which is a commonly used U-shaped nickel-titanium dental arch wire in the art. U-shaped springs 9 are welded at both ends, and the U-shaped springs 9 are used to adjust the arch extension of the nickel-titanium dental arch wire 1. The steel wire dental arch wire 6 is U-shaped, and the left and right front parts are provided with a first traction hook 3 and a second traction hook 11 for hooking and pulling a rubber band 4. The upper belt ring 5 (a belt ring with a traction hook commonly used in the art) is provided with a buccal tube 8, and the left and right buccal tubes 8 are provided with a third traction hook 12 and a fourth traction hook 13; the buccal tube 8 of the lower belt ring 7 (a belt ring without a traction hook commonly used in the art) does not need a traction hook;

[0049] The upper band ring 5 is sleeved on the sixth molar of the upper teeth, and the third traction hook 12 and the fourth traction hook 13 are located on the upper part of the buccal tube 8, and the lower band ring 7 is sleeved on the sixth molar of the lower teeth; the bracket 2 is glued to the upper crossbite teeth and the four front teeth of the lower teeth; the nickel-titanium dental arch wire 1 and the steel wire dental arch wire 6 are all ligated (a conventional connection method in this field) in a number of brackets 2, and the two ends of the nickel-titanium dental arch wire 1 are passed through the buccal tube 8 of the upper band ring 5, the U-shaped spring 9 opens downward, the main body is attached to the upper tooth surface, and does not conflict with the lower teeth. The end of the U-shaped spring 9 that is close to the buccal tube 8 is the movable end, and the end of the U-shaped spring 9 that is away from the buccal tube 8 is the welding end. Moving the movable end changes the width of the U-shaped spring 9, thereby changing the arching degree of the nickel-titanium dental arch wire 1, and the two ends of the steel wire dental arch wire 6 are passed through the buccal tube 8 of the lower band ring 7; the first traction hook 3 and the second traction hook 11 are close to the corresponding lateral incisor and face upward;

[0050] The rubber band 4 on the left side hooks the first traction hook 3 and the third traction hook 12, and the rubber band 4 on the right side hooks the second traction hook 11 and the fourth traction hook 13. The two rubber bands 4 are pulled in an inverted eight-shaped shape (forming an inner traction on the four lower front teeth).

[0051] As an improvement, the diameter of the nickel-titanium dental arch wire 1 is 0.016 or 0.018 or 0.020 inches, and the resilience is within a suitable range. The diameter of the steel dental arch wire 6 is 0.016 inches, and the elasticity is within a suitable range.

[0052] As an improvement, the nickel-titanium arch wire 1 and the steel arch wire 6 are both 3-4.2 cm wide, which are suitable for children in the mixed dentition period.

[0053] As an improvement, a ring 10 is provided at the movable end of the U-shaped spring 9 , and the nickel-titanium dental arch wire 1 passes through the ring 10 .

[0054] As an improvement, the U-shaped spring 9 has a diameter of 0.5 mm, a height of 0.5 cm, and a width of 0.6 cm. The material of the U-shaped spring 9 is steel wire, and the size and material meet the requirements of suitable elasticity.

[0055] As an improvement, the tension of the rubber band 4 is 140-150g, which satisfies the appropriate elasticity.

[0056] A method for manufacturing a corrector for children's dental crossbite, comprising the following steps:

[0057] Step 1, make a tooth model for children with crossbite correction, put two upper band rings 5 ​​on the two sixth-year teeth of the upper teeth of the tooth model, put two lower band rings 7 on the two sixth-year teeth of the lower teeth of the tooth model, the buccal tubes 8 of the two band rings are facing outwards, and the third traction hook 12 and the fourth traction hook 13 of the left and right upper band rings 5 ​​are both on the upper part of the buccal tube 8;

[0058] Step 2, select a nickel-titanium wire, and make a matching U-shaped nickel-titanium dental arch wire 1 according to the width of the upper dental arch of the tooth model, insert both ends of the nickel-titanium dental arch wire 1 into the buccal tube 8, so that the front end of the nickel-titanium dental arch wire 1 is arched out of the dental arch, and then cut off the nickel-titanium dental arch wire 1 from the rear end of the buccal tube 8;

[0059] Step 3, welding a U-shaped spring 9 near the buccal tube 8 of the nickel-titanium dental arch wire 1, with the opening of the U-shaped spring 9 facing downward, the end of the U-shaped spring 9 close to the buccal tube 8 being the movable end, and the end of the U-shaped spring 9 away from the buccal tube 8 being the welding end;

[0060] Step 4, select a steel wire, make a matching U-shaped steel wire arch wire 6 according to the width of the lower dental arch of the tooth model, insert both ends of the steel wire arch wire 6 into the buccal tube 8, make the front end of the steel wire arch wire 6 stick to the teeth, and then cut off the steel wire arch wire 6 from the rear end of the buccal tube 8;

[0061] Step 5, welding the first traction hook 3 and the second traction hook 11 facing upwards at the positions of the steel wire arch wire 6 near the left and right incisors;

[0062] Step 6, put the two upper belt rings 5 ​​on the two sixth-year molars of the upper teeth of the child's teeth, put the two lower belt rings 7 on the two sixth-year molars of the lower teeth of the child's teeth, the buccal tubes 8 of the two belt rings are facing outwards, and the third traction hook 12 and the fourth traction hook 13 of the left and right upper belt rings 5 ​​are both on the upper part of the buccal tube 8;

[0063] Step 7: Bond bracket 2 on the upper crossbite and the four front teeth of the lower teeth;

[0064] Step 8: Insert the welded nickel-titanium arch wire 1 into the buccal tube 8 of the upper teeth. Use a push-pull gauge to squeeze the front end of the nickel-titanium arch wire 1 inward until it touches the teeth, and measure the resilience of the nickel-titanium arch wire 1. The required resilience is 160 - 190 g. If it does not meet the requirement, adjust the distance between the front end of the nickel-titanium arch wire 1 and the teeth by slightly moving the movable end of the U-shaped spring 9 until the measured resilience meets the requirement. If the requirement cannot be met after all adjustments, discard it and remake it.

[0065] Step 9: Squeeze the front end of the nickel-titanium arch wire 1 inward and ligate it in the bracket 2 of the cross-bite teeth to form an outward pulling force on the cross-bite teeth.

[0066] Step 10: Insert both ends of the wire arch wire 6 into the buccal tubes 8 of the lower teeth and ligate them in the brackets 2 on the four lower anterior teeth. The first traction hook 3 and the second traction hook 11 face upward.

[0067] Step 11: Select two rubber bands 4. The left rubber band 4 hooks the first traction hook 3 and the third traction hook 12, and the right rubber band 4 hooks the second traction hook 11 and the fourth traction hook 13. The two rubber bands 4 form an inverted V-shaped traction to apply an inward pulling force on the four lower anterior teeth.

[0068] As an improvement, in step 2, the front end of the nickel-titanium arch wire 1 protrudes 1 - 1.2 cm out of the dental arch.

[0069] As an improvement, in step 8, the required resilience is 180 g.

[0070] In specific implementation, the nickel-titanium arch wire is a nickel-titanium alloy arch wire, and the wire arch wire 6 is an orthodontic stainless steel wire or can also be an imitation Australian wire. When making and using this orthodontic appliance with the above steps, it is recommended to wear it after dinner. You can tell the child to have dinner one hour earlier and prohibit eating at night after wearing to prevent the bracket 2 from falling off during chewing. If the root tips of the child's front teeth are not fully developed, the required resilience of the nickel-titanium arch wire 1 is 160 - 170 g. If the child's upper first molars have not erupted, the band can be installed on the fifth deciduous tooth, and there will be no situation where it cannot be installed.

[0071] This orthodontic appliance does not require a bite plate to open the bite. It uses the freeway space to relieve the cross-bite of the teeth. Usually, the cross-bite of the teeth can be relieved overnight. After maintaining for one to two weeks, take a dental model again with reference to the above steps, make a suitable nickel-titanium arch wire and wire arch wire, and wear them together with the band and bracket. Stop the rubber band traction, and follow up the treatment until the upper anterior teeth 21丨12 erupt. Then, until the four upper anterior teeth and the four lower anterior teeth reach a normal overbite and overjet relationship, and the posterior molars (first molars) are adjusted to a neutral occlusion relationship, maintain for 1 to 3 months (depending on the situation), and then remove the arch wire.

[0072] The present invention and its embodiments are described above, and such description is not restrictive, and the actual protection scope is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A corrector for children's underbite, characterized in that: It comprises a nickel-titanium dental arch wire (1) for upper teeth, a steel dental arch wire (6) for lower teeth, two upper bands (5), two lower bands (7), two rubber bands (4) and a plurality of brackets (2); The nickel-titanium dental arch wire (1) is U-shaped, and U-shaped springs (9) are welded at two ends; the steel dental arch wire (6) is U-shaped, and a first traction hook (3) and a second traction hook (11) are provided on the left and right front parts; the upper belt ring (5) is provided with a buccal tube (8), and the left and right buccal tubes (8) are provided with a third traction hook (12) and a fourth traction hook (13); The upper band ring (5) is sleeved on the sixth molar of the upper teeth and the third traction hook (12) and the fourth traction hook (13) are located on the upper part of the buccal tube (8), and the lower band ring (7) is sleeved on the sixth molar of the lower teeth; the bracket (2) is glued to the reverse jaw teeth of the upper teeth and the four front teeth of the lower teeth; the nickel-titanium dental arch wire (1) and the steel wire dental arch wire (6) are both tied in a plurality of brackets (2), and the two ends of the nickel-titanium dental arch wire (1) are inserted into the buccal tube (8) of the upper band ring (5); the U-shaped spring (9) is opened downward, and the end of the U-shaped spring (9) close to the buccal tube (8) is the movable end, and the end of the U-shaped spring (9) away from the buccal tube (8) is the welding end, and the two ends of the steel wire dental arch wire (6) are inserted into the buccal tube (8) of the lower band ring (7); the first traction hook (3) and the second traction hook (11) are close to the corresponding lateral incisor and face upward; The rubber band (4) on the left side hooks and pulls the first traction hook (3) and the third traction hook (12), and the rubber band (4) on the right side hooks and pulls the second traction hook (11) and the fourth traction hook (13), and the two rubber bands (4) are pulled in an inverted figure eight shape.

2. The corrector for children's underbite according to claim 1, characterized in that: The diameter of the nickel-titanium dental arch wire (1) is 0.016, 0.018 or 0.020 inches, and the diameter of the steel dental arch wire (6) is 0.016 inches.

3. The corrector for children's underbite according to claim 1, characterized in that: The nickel-titanium dental arch wire (1) and the steel dental arch wire (6) are both 3-4.2 cm wide.

4. The corrector for children's underbite according to claim 1, characterized in that: The movable end of the U-shaped spring (9) is provided with a collar (10), and the nickel-titanium dental arch wire (1) passes through the collar (10).

5. The corrector for children's underbite according to claim 1, characterized in that: The U-shaped spring (9) has a diameter of 0.5 mm, a height of 0.5 cm, and a width of 0.6 cm. The material of the U-shaped spring (9) is steel wire.

6. The corrector for children's underbite according to claim 1, characterized in that: The pulling force of the rubber band (4) is 140-150g.

7. A method for manufacturing a corrective appliance for children's underbite according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1, making a tooth model for children with crossbite correction, putting two upper band rings (5) on two sixth-year molars on the upper teeth of the tooth model, and putting two lower band rings (7) on two sixth-year molars on the lower teeth of the tooth model, with the buccal tubes (8) of the two band rings facing outwards, and the third traction hook (12) and the fourth traction hook (13) of the left and right upper band rings (5) both being on the upper part of the buccal tubes (8); Step 2, selecting a nickel-titanium wire, making a matching U-shaped nickel-titanium dental arch wire (1) according to the width of the upper dental arch of the tooth model, inserting both ends of the nickel-titanium dental arch wire (1) into the buccal tube (8), making the front end of the nickel-titanium dental arch wire (1) protrude from the dental arch, and then cutting off the nickel-titanium dental arch wire (1) from the rear end of the buccal tube (8); Step 3, welding a U-shaped spring (9) near the buccal tube (8) of the nickel-titanium dental arch wire (1), with the opening of the U-shaped spring (9) facing downward, the end of the U-shaped spring (9) close to the buccal tube (8) being the movable end, and the end of the U-shaped spring (9) away from the buccal tube (8) being the welding end; Step 4, select a steel wire, make a matching U-shaped steel wire dental arch wire (6) according to the width of the lower dental arch of the tooth model, insert both ends of the steel wire dental arch wire (6) into the buccal tube (8), make the front end of the steel wire dental arch wire (6) stick to the teeth, and then cut the steel wire dental arch wire (6) from the rear end of the buccal tube (8); Step 5, welding an upwardly directed first traction hook (3) and a second traction hook (11) near the left and right incisors of the steel wire arch wire (6); Step 6: Put the two upper band rings (5) on the two sixth-year molars of the upper teeth of the child, and put the two lower band rings (7) on the two sixth-year molars of the lower teeth of the child, with the buccal tubes (8) of the two band rings facing outwards, and the third traction hook (12) and the fourth traction hook (13) of the left and right upper band rings (5) are both on the upper part of the buccal tubes (8); Step 7, bonding brackets (2) on the upper crossbite teeth and the four front teeth of the lower teeth; Step 8, insert the welded nickel-titanium dental arch wire (1) into the buccal tube (8) of the upper teeth, use a push-pull force gauge to squeeze the front end of the nickel-titanium dental arch wire (1) inward until it touches the teeth, and measure the rebound force of the nickel-titanium dental arch wire (1). The rebound force is required to meet 160-190g. If it is not satisfied, fine-tune the distance between the front end of the nickel-titanium dental arch wire (1) and the teeth by moving the movable end of the U-shaped spring (9) until the measured rebound force meets the requirement; if it still fails to meet the requirement, it is discarded and redone; Step 9, squeeze the front end of the nickel-titanium dental arch wire (1) inward and tie it into the bracket (2) of the crossbite; Step 10, inserting both ends of the steel dental arch wire (6) into the buccal tube (8) of the lower teeth, and tying them in the brackets (2) on the four lower front teeth, with the first traction hook (3) and the second traction hook (11) facing upwards; Step 11, select two rubber bands (4), the left rubber band (4) is hooked to pull the first traction hook (3) and the third traction hook (12), and the right rubber band (4) is hooked to pull the second traction hook (11) and the fourth traction hook (13), and the two rubber bands (4) are pulled in an inverted figure eight.

8. The method for manufacturing a corrective appliance for children's crossbite according to claim 7, characterized in that: In step 2, the front end of the nickel-titanium dental arch wire (1) protrudes 1-1.2 cm from the dental arch.

9. The method for manufacturing a corrective appliance for children's crossbite according to claim 7, characterized in that: The rebound force requirement in step 8 is 180 g.

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