Orthodontic device for treating anterior crossbite in children

Abstract

Provided is an anterior crossbite correction device for children which is easy to wear and fix, has almost no pain or foreign body sensation during wearing, enables correction of anterior crossbite in a short period, has a low burden on children, and has high correction accuracy. 【Solution means】The anterior crossbite correction device for children includes a nickel-titanium arch wire for the upper jaw, a steel arch wire for the lower jaw, two bands for the upper jaw, two bands for the lower jaw, two elastics, and a plurality of brackets. A U-shaped spring is welded near both ends of the nickel-titanium arch wire, and two traction hooks are provided at the front part. The band for the upper jaw is worn on the upper first molar, the traction hook is arranged above the buccal tube, and the band for the lower jaw is worn on the lower first molar. The brackets are adhered to the anterior crossbite teeth of the upper jaw and the four front teeth of the lower jaw. The nickel-titanium arch wire and the steel arch wire are ligated to a plurality of brackets.

Description

Technical Field

[0001] This utility model relates to the technical field of crossbite (receptive bite) correction, and particularly to a crossbite correction device for children.

Background Art

[0002] Crossbite (receptive bite) is generally known as "overbite" or "mandibular protrusion", and is a relatively common symptom among dental malocclusions. This has a great impact on chewing function, tooth development, and jawbone growth. If this abnormality is not properly treated in early childhood, the symptoms will worsen with age, the mandible will protrude, and the central part of the face will sink, seriously affecting the aesthetics of the facial appearance. Currently, many parents are trying methods such as having their children chew on chopsticks or bamboo pieces as folk remedies for crossbite. However, with these methods, although there may be occasional improvement in a very small number of cases, in many cases, the opposite effect occurs, and inappropriate habits are developed, making subsequent scientific orthodontic treatment difficult. Based on the growth characteristics of children, the growth of the jawbone is most active when the upper anterior teeth erupt (one or two) at the age of 6 - 8 for girls and 7 - 9 for boys. By wearing an appropriate orthodontic device during this period (golden time), the crossbite can be quickly eliminated by the pulling force of the orthodontic device. By releasing the crossbite at the appropriate timing, it is possible to suppress the overgrowth of the mandible and promote the growth of the maxilla. This can prevent the crossbite from progressing to a skeletal problem. Currently, there are three types of devices used for early crossbite correction: the bite elevation spring correction device, the functional correction device, and the forward traction device. These correction devices require an adaptive selection based on etiological classification (dental, skeletal, functional), and all require bite elevation using a bite elevation plate or the like. Common drawbacks include the large size of the device, overly strong acting force, rapid force decay, uneven force distribution, and strong foreign body sensation and pain, so children are reluctant to wear them. Furthermore, the manufacturing process is complex, wearing and adjustment are difficult, and the treatment period is long. It usually takes 3 - 6 months, or 1 - 2 years in the longest cases, to release the crossbite, and it is not always possible to release the crossbite at the optimal timing.

Summary of the Invention

[0003] The object of the present utility model is to provide an anterior crossbite correction device for children in order to solve the problems raised in the above-mentioned background art. To achieve the above technical problems, the present application provides the following technical means. The anterior crossbite correction device for children of the present utility model includes a nickel-titanium arch wire for the upper jaw, a steel arch wire for the lower jaw, two bands for the upper jaw, two bands for the lower jaw, two elastics, and a plurality of brackets. The nickel-titanium arch wire is U-shaped, and U-shaped springs are welded near both ends. The steel arch wire is also U-shaped, and a first traction hook and a second traction hook are provided on the left and right of the front part. The band for the upper jaw is provided with a buccal tube, and a third traction hook and a fourth traction hook are provided on the left and right buccal tubes. The band for the upper jaw is attached to the upper first molar. The third traction hook and the fourth traction hook are arranged at the upper part of the buccal tube. The band for the lower jaw is attached to the lower first molar. The brackets are adhered to the anterior crossbite teeth of the upper jaw and the four anterior teeth of the lower jaw. The nickel-titanium arch wire and the steel arch wire are ligated to a plurality of brackets. Both ends of the nickel-titanium arch wire are inserted into the buccal tubes of the bands for the upper jaw. The U-shaped spring has an opening facing downward, the side in contact with the buccal tube is the movable end, and the side away is the fixed welding end. Both ends of the steel arch wire are inserted into the buccal tubes of the bands for the lower jaw. The first traction hook and the second traction hook are respectively arranged near the lateral incisors and face upward. The left elastic is hung on the first traction hook and the third traction hook, and the right elastic is hung on the second traction hook and the fourth traction hook. The two elastics form an inverted V-shaped traction force.

[0004] Preferably, the diameter of the nickel-titanium arch wire is 0.016, 0.018, or 0.020 inches, and the diameter of the steel arch wire is 0.016 inches. Preferably, the widths of the nickel-titanium arch wire and the steel arch wire are 3 - 4.2 cm. Preferably, a ring is provided at the movable end of the U-shaped spring, and the nickel-titanium arch wire passes through the ring. Preferably, the diameter of the U-shaped spring is 0.5 mm, the height is 0.5 cm, and the width is 0.6 cm, and the material of the U-shaped spring is steel. Preferably, the tensile force of the elastic is 140 - 150 g.

[0005] This utility model has the following advantages compared with the prior art. This pediatric crossbite correction device does not require the distinction between dental, skeletal, and functional types, and can be applied to the early treatment of all crossbites in children. It does not require bite elevation using a bite elevation plate or the like, and is a mechanism that uses the freeway space to relieve crossbite. This provides auxiliary support to the dental arch of children at the optimal timing, and utilizes the repulsive force, shape memory characteristics, and continuous correction force of the nickel-titanium arch wire and the elastic to move the teeth to the appropriate positions and correct the crossbite. In addition, this correction device has a simple manufacturing process, is easy to wear and fix, and does not have the problem of being unable to be worn due to the unerupted first molar or the like. Also, it adopts a method of pulling the teeth outward, making it easy to adjust the force. The repulsive force of the nickel-titanium arch wire is gentle while having persistence, and there is almost no pain or foreign body sensation during wearing. Therefore, it is possible to improve crossbite in a short period, with less burden on children. Also, it has the characteristics of high correction accuracy and low likelihood of relapse after treatment.

Brief Description of the Drawings

[0006] To more clearly explain the technical means in the embodiments of this utility model or in the prior art, the following drawings used will be briefly introduced. Obviously, the drawings shown below are schematic diagrams showing some structures of this utility model and do not cover all of them.

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Embodiments for Carrying out the Invention

[0007] With reference to the drawings in the embodiments of this utility model below, the technical means in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of this utility model. In the description of the embodiments of the present utility model, the positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. mentioned are based on the orientation or positional relationship shown in the drawings, or based on the customary arrangement during the use of the products of the present utility model. This is for facilitating the description of the present utility model and simplifying the description, and does not imply that the device or component needs to have a specific orientation, so it cannot be understood as a limitation to the present utility model. Furthermore, terms such as "first", "second", "third", etc. are used for distinction and do not imply relative importance. Terms such as "horizontal", "vertical", "suspended", etc. do not require that the component is absolutely horizontal, vertical or suspended, and can be slightly inclined. For example, "horizontal" simply refers to a direction that is more horizontal relative to "vertical", and does not necessarily have to be completely horizontal and can be slightly inclined. In the description of the embodiments of the present utility model, the terms "a number of", "a plurality of" indicate at least two. In the description of the embodiments of the present utility model, unless otherwise explicitly specified or limited, the terms "installed", "attached", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood based on the specific situation.

[0008] In this embodiment, based on FIGS. 1 to 8, a pediatric crossbite correction device will be described in detail. The pediatric crossbite correction device of this embodiment includes an upper nickel-titanium arch wire 1, a lower steel arch wire 6, two upper bands 5, two lower bands 7, two elastics 4, and a plurality of brackets 2. The nickel-titanium arch wire 1 is a common U-shaped wire, and U-shaped springs 9 are welded near both ends. This U-shaped spring 9 is for adjusting the protrusion amount of the nickel-titanium arch wire 1. The steel arch wire 6 is also U-shaped, and a first traction hook 3 and a second traction hook 11 for hanging on the elastic 4 are provided on the left and right of the front part. The upper jaw band 5 is a band with a traction hook commonly used in this field, and a buccal tube 8 is attached. Third traction hooks 12 and fourth traction hooks 13 are provided on the left and right buccal tubes 8 respectively. The lower jaw band 7 is a band without a traction hook commonly used in this field, and a traction hook is not required on its buccal tube 8. The upper jaw band 5 is attached to the upper first molar, and the third traction hook 12 and the fourth traction hook 13 are arranged at the upper part of the buccal tube 8. The lower jaw band 7 is attached to the lower first molar. The bracket 2 is adhered to the upper opposing occlusal teeth and the four anterior teeth of the lower jaw. The nickel-titanium arch wire 1 and the steel arch wire 6 are ligated to a plurality of brackets 2 in the normal method in this field. Both ends of the nickel-titanium arch wire 1 are inserted into the buccal tube 8 of the upper jaw band 5, and the U-shaped spring 9 is in close contact with the tooth surface of the upper jaw with the opening facing downward. The U-shaped spring 9 does not contact the lower teeth, the side in contact with the buccal tube 8 is the movable end, and the side away is the fixed welding end. By adjusting the movable end, the width of the U-shaped spring 9 can be changed, and the protrusion amount of the nickel-titanium arch wire 1 can be adjusted. Both ends of the steel arch wire 6 are inserted into the buccal tube 8 of the lower jaw band 7. The first traction hook 3 and the second traction hook 11 are arranged near the lateral incisors respectively and face upward. The left elastic 4 is hung on the first traction hook 3 and the third traction hook 12. The right elastic 4 is hung on the second traction hook 11 and the fourth traction hook 13. The two elastics 4 form an inverted V-shaped traction force and apply an inward traction force to the four anterior teeth of the lower jaw. Preferably, the diameter of the nickel-titanium arch wire 1 is 0.016, 0.018, or 0.020 inches, and it has an appropriate range of repulsive force. The diameter of the steel arch wire 6 is 0.016 inches, and it has appropriate elasticity.

[0009] Preferably, the widths of the nickel-titanium arch wire 1 and the steel arch wire 6 are 3 - 4.2 cm, which are suitable for children in the mixed dentition stage. Preferably, a ring 10 is provided at the movable end of the U-shaped spring 9, and the nickel-titanium arch wire 1 passes through the ring 10. Preferably, the diameter of the U-shaped spring 9 is 0.5 mm, the height is 0.5 cm, and the width is 0.6 cm. The material of the U-shaped spring 9 is steel, and the size and material meet appropriate elasticity. Preferably, the tensile force of the elastic 4 is 140 - 150 g, which meets appropriate elasticity.

[0010] The manufacturing method of the pediatric crossbite correction device according to the present application includes the following steps. Step 1: Fabricate a dental model of a child with a crossbite, attach two upper bands 5 to the upper first molars of the model, and attach two lower bands 7 to the lower first molars. The buccal tubes 8 of all the bands face outward, and the third traction hooks 12 and the fourth traction hooks 13 of the left and right upper bands 5 are arranged at the upper part of the buccal tubes 8. Step 2: Select a nickel-titanium wire and fabricate a U-shaped nickel-titanium arch wire 1 according to the width of the upper dental arch of the dental model. Insert both ends of the nickel-titanium arch wire 1 into the buccal tubes 8, protrude the front end from the dental arch, and then cut the nickel-titanium arch wire 1 at the rear end of the buccal tube 8. Step 3: Weld a U-shaped spring 9 near the buccal tube 8 of the nickel-titanium arch wire 1. The opening of the U-shaped spring 9 faces downward, the side in contact with the buccal tube 8 is the movable end, and the side away is the fixed welding end. Procedure 4: Select a steel wire and fabricate a U-shaped steel arch wire 6 according to the width of the mandibular dental arch of the dental cast. Insert both ends of the steel arch wire 6 into the buccal tubes 8, bring the front end into close contact with the tooth surface, and then cut the steel arch wire 6 at the rear end of the buccal tube 8. Procedure 5: Weld an upward first traction hook 3 and a second traction hook 11 near the left and right central incisors of the steel arch wire 6. Procedure 6: Attach two maxillary bands 5 to the maxillary first molars of the child and two mandibular bands 7 to the mandibular first molars. The buccal tubes 8 of all the bands face outward, and the third traction hook 12 and the fourth traction hook 13 of the left and right maxillary bands 5 are arranged at the upper part of the buccal tube 8. Procedure 7: Adhere brackets 2 to the cross-bite teeth of the maxilla and the four anterior teeth of the mandible. Procedure 8: Insert the fabricated nickel-titanium arch wire 1 into the buccal tube 8 of the maxilla, push the front end of the nickel-titanium arch wire 1 inward using a push-pull gauge, and measure the repulsive force in a state of being in close contact with the tooth surface. The required repulsive force is 160 - 190 g. If this is not met, adjust the movable end of the U-shaped spring 9 to finely adjust the protruding amount of the nickel-titanium arch wire 1 until the specified repulsive force is reached. If it still does not fall within the specified range after adjustment, fabricate it again. Procedure 9: Push the front end of the nickel-titanium arch wire 1 inward and ligate it to the bracket 2 of the cross-bite teeth to form an outward orthodontic force on the cross-bite teeth. Procedure 10: Insert both ends of the steel arch wire 6 into the buccal tubes 8 of the mandible and ligate them to the brackets 2 of the four anterior teeth of the mandible. The first traction hook 3 and the second traction hook 11 face upward. Procedure 11: Select two elastics 4. Hang the left elastic 4 on the first traction hook 3 and the third traction hook 12, and hang the right elastic 4 on the second traction hook 11 and the fourth traction hook 13. Thereby, the two elastics 4 form an inverted eight-shaped traction force and apply an inward orthodontic force to the four anterior teeth of the mandible. Preferably, in Step 2, the front end of the nickel-titanium arch wire 1 protrudes 1 to 1.2 cm from the dental arch. Preferably, in Step 8, the required repulsive force is set to 180 g.

[0011] For the nickel-titanium arch wire of this orthodontic device, nickel-titanium alloy can be used, for the steel arch wire, orthodontic stainless steel or Australian wire can be used. When using this device, it is recommended to wear it after dinner, and guide the patient to finish eating one hour before wearing. After wearing, avoid eating and drinking at night, and pay attention to prevent the bracket 2 from falling off due to chewing. Also, when the root tip of the anterior teeth of a child is immature, the repulsive force of the nickel-titanium arch wire 1 should be in the range of 160 - 170 g. When the first molar has not erupted, the band can be attached to the second deciduous molar to solve the problem, so there will be no problem of non - attachment. This orthodontic device does not require occlusal elevation by an occlusal elevation plate or the like, and uses the freeway space to relieve crossbite. Usually, the crossbite is relieved in one night. After maintaining for 1 - 2 weeks, the dental cast is taken again, and an appropriate nickel-titanium arch wire 1 and steel arch wire 6 are fabricated and attached together with the band and bracket. At this point, elastic traction is stopped, and the treatment is continued to establish the normal overjet relationship of the four maxillary anterior teeth. Further, adjust the first molar (6-year molar) to a neutral occlusion, and after a retention period of 1 - 3 months (in some cases), remove the arch wire.

[0012] The above description shows this utility model and its embodiments, but the scope of its protection is not limited thereto. Modifications or substitutions that can be easily conceived by those skilled in the art within the technical scope of this utility model should be construed as being included in the protection scope of this utility model. Therefore, the protection scope of this utility model shall be based on the description in the claims.

Explanation of Reference Numerals

[0013] 1 Nickel-titanium arch wire 2 Bracket 3 First traction hook 4 Elastic 5 Upper jaw band 6 Steel arch wire 7 Lower jaw band 8 Buccal tube 9 U-shaped spring 10 Ring 11 Second traction hook 12 Third traction hook 13 Fourth traction hook

Claims

1. A pediatric crossbite correction device including a nickel titanium arch wire (1) for the upper jaw, a steel arch wire (6) for the lower jaw, two bands (5) for the upper jaw, two bands (7) for the lower jaw, two elastics (4), and a number of brackets (2), The nickel titanium arch wire (1) is U-shaped, and U-shaped springs (9) are welded to both ends of the arch wire (6). The steel arch wire (6) is also U-shaped, and a first retraction hook (3) and a second retraction hook (11) are provided on the left and right sides of the front of the arch wire (6). The upper jaw band (5) is provided with a buccal tube (8), and the left and right buccal tubes (8) are provided with a third retraction hook (12) and a fourth retraction hook (13). The maxillary band (5) is attached to the maxillary first molar, the third retraction hook (12) and the fourth retraction hook (14) are disposed on the upper part of the buccal tube (8), the mandibular band (7) is attached to the mandibular first molar, the brackets (2) are bonded to the maxillary opposing teeth and the four mandibular anterior teeth, the nickel titanium arch wire (1) and the steel arch wire (6) are ligated to the brackets (2), both ends of the nickel titanium arch wire (1) are inserted into the buccal tube (8) of the maxillary band (5), the opening of the U-shaped spring (9) faces downward, the side in contact with the buccal tube (8) is the movable end, and the side away from it is the fixed welded end, both ends of the steel arch wire (6) are inserted into the buccal tube (8) of the mandibular band (7), and the first retraction hook (3) and the second retraction hook (11) are disposed near the lateral incisors and face upward, This pediatric crossbite correction device is characterized in that the left elastic (4) is hung on the first traction hook (3) and the third traction hook (12), and the right elastic (4) is hung on the second traction hook (11) and the fourth traction hook (13), and the two elastics (4) form an inverted eight-shaped traction force.

2. The pediatric crossbite correction device of claim 1, characterized in that the nickel titanium arch wire (1) has a diameter of 0.016, 0.018, or 0.020 inches and the steel arch wire (6) has a diameter of 0.016 inches.

3. The pediatric crossbite corrector according to claim 1, characterized in that the width of the nickel-titanium arch wire (1) and the steel arch wire (6) is 3-4.2 cm.

4. The pediatric crossbite correction device as described in claim 1, characterized in that a ring (10) is provided at the movable end of the U-shaped spring (9) and the nickel titanium arch wire (1) passes through the ring (10).

5. The pediatric crossbite correction device as described in 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, and is made of steel.

6. The pediatric crossbite correction device according to claim 1, characterized in that the tensile force of the elastic (4) is 140-150 g.

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