Split adjustable pre-orthodontic appliance for nasoalveolar surgery and manufacturing method and application thereof

Abstract

The application discloses a split-adjustable pre-nasal-alveolar surgery appliance and a manufacturing method and application thereof, and belongs to the technical field of oral medical instruments. The appliance comprises a first palatal guard plate and a second palatal guard plate, a spiral spring is arranged between the first palatal guard plate and the second palatal guard plate, and at least one of the first palatal guard plate and the second palatal guard plate is provided with a nose support. The nose support is arranged in the nasal cavity of a patient to support the nasal cavity, the first palatal guard plate and the second palatal guard plate are arranged in the oral cavity of the patient to support the maxilla, and the spiral spring is adjusted and fixed by medical adhesive tape, so that the patient's nasal-lip deformity and alveolar cleft are corrected. The application is suitable for correcting the nasal-lip deformity and alveolar cleft of the patient, can achieve the inward retraction of the front part of the non-cleft side alveolar bone segment and the lateral displacement of the cleft side alveolar bone segment, realizes the correction of the asymmetric alveolar bone segment displacement under the complete palatal constraint, and further cooperates with the split modular design of the appliance to make the structures of the components simple and facilitate fine adjustment.

Description

Technical Field

[0001] This invention belongs to the field of oral medical device technology, and in particular relates to a split adjustable nasoalveolar preoperative orthodontic appliance, its manufacturing method and application. Background Technology

[0002] Cleft lip and palate (CLP) is the most common congenital craniofacial malformation, with a global incidence of approximately 1 in 700 live births. Preoperative nasal alveolar shaping (NAM) takes advantage of the high plasticity of neonatal tissues by using an orthodontic appliance to guide the alveolar bone segment toward its normal position, reduce the width of the cleft lip and alveolar cleft, and improve nasolabial symmetry, thus creating favorable anatomical conditions for subsequent cleft lip repair surgery. Its efficacy has been fully demonstrated.

[0003] However, among the various subtypes of cleft lip and palate, simple cleft lip with alveolar cleft (without palate) presents unique anatomical and biomechanical challenges. The bony connections of the intact palate constrain the bilateral alveolar bone segments, greatly hindering the rotation and arch shaping of the alveolar bone segments. At the same time, the lack of a palatal cleft prevents the orthodontic appliance from utilizing the cleft space as a natural retention anchor point. These factors place much higher demands on the design precision and mechanical control of the orthodontic appliance than on complete cleft lip and palate. In recent years, although digital technology has been applied to the fabrication of PNAM appliances and has significantly improved fabrication precision and efficiency, existing digital solutions still use an integrated palatal guard as the basic structure, failing to fundamentally address the differentiated mechanical needs of patients without palate.

[0004] In existing technologies, traditional integrated palatal braces can only passively guide alveolar bone growth through surface grinding, and cannot simultaneously achieve lateral displacement of the alveolar bone segment on the cleft side and retraction of the anterior portion of the non-cleft alveolar bone segment, nor can they apply directional force. Publicly available patents, such as CN113147039A, disclose a preoperative orthodontic appliance for infants with cleft lip and palate, which uses an integrated palatal brace connected to a nasal support buckle, but its structure also cannot apply differentiated directional force to the bilateral alveolar bone segments. Premkumar et al. used an integrated NAM combined with selective surface grinding, but could not apply directional force, and the correction effect on T-shaped step deformities was limited. Nguyen et al. used rigid expansion screws to generate parallel separation force, which could narrow the cleft, but could not independently adjust the asymmetrical alveolar bone segment displacement, that is, the alveolar bone segment on the cleft side needs to be laterally displaced, and the anterior portion of the alveolar bone segment on the non-cleft side needs to be retracted posteriorly and inwardly, and the rigid screws could not simultaneously meet this differentiated requirement.

[0005] Therefore, for patients without cleft palate, there is an urgent need for an orthodontic appliance that can simultaneously achieve lateral displacement of the alveolar bone segment on the cleft side and retraction of the anterior portion of the alveolar bone segment on the non-cleft side, has an asymmetrical elastic force distribution, and can be finely adjusted. Summary of the Invention

[0006] The purpose of this invention is to address the problems existing in the prior art by providing a split adjustable nasoalveolar preoperative orthodontic appliance, its manufacturing method, and its application.

[0007] To achieve the above objectives, the invention employs the following technical solution: In a first aspect, a split adjustable preoperative nasal alveolar appliance includes a first palatal guard and a second palatal guard, with a helical spring provided between the first palatal guard and the second palatal guard, and a nasal support provided on at least one of the first palatal guard and the second palatal guard.

[0008] By adopting the above technical solution, the structural design of the first palatal plate, the second palatal plate, and the spiral spring is adapted to the average range of the alveolar bone segment angles on both sides of most patients. Combined with the nasal bracket to support the patient's nasal cavity, it applies a directional, controllable, and continuous lifting force to the collapsed and displaced nasal dome. Together with the first palatal plate, the second palatal plate, and the spiral spring, they work together to correct the patient's nasolabial deformity and alveolar cleft.

[0009] As a further technical solution, the helical spring is made of bent metal wire with a diameter of 0.8~1.0mm.

[0010] As a further technical solution, the helical spring includes a spring body and embedded ends located at both ends of the spring body, with the two embedded ends respectively embedded in the first palatal guard plate and the second palatal guard plate.

[0011] By adopting the above technical solution, the preferred helical spring is made of stainless steel wire with a diameter of 0.8~1.0mm. The helical spring applies force to the first palatal guard plate and the second palatal guard plate to control the relative distance between the alveolar bone segments on both sides in the horizontal direction, thereby realizing the gradual closure of the alveolar bone cleft.

[0012] As a further technical solution, the initial expansion force of the helical spring is 1.0~3.0N and the initial opening angle α is 20~60°.

[0013] As a further technical solution, the initial expansion force of the helical spring is 1.5~2.0N and the initial opening angle α is 30~45°.

[0014] By adopting the above technical solution, because there are individual differences in the angle between the alveolar bone segments on both sides of the patient, in order to cover the majority of the children, the initial expansion force is 1.0~3.0N and the initial opening angle α is 20~60°; however, the angle between the alveolar bone segments on both sides of most children is within the average range, so the preferred initial expansion force of the helical spring is 1.5~2.0N and the initial opening angle α is 30~45°.

[0015] As a further technical solution, after each force-induced widening of the two embedded ends, the initial opening angle α of the helical spring increases by 5~10°, and the plate spacing between the first palatal guard plate and the second palatal guard plate increases by ≤1.0mm.

[0016] By adopting the above technical solution, the adjustment of the embedded ends of the spiral spring at both ends allows for adjustment of the distance between the first palatal guard and the second palatal guard, thereby avoiding the cumbersome process of adding or removing materials during continuous treatment of the palatal guard and enabling the orthodontic appliance to be adjusted in a standardized manner to meet the patient's correction needs at different stages during the continuous treatment period.

[0017] As a further technical solution, the nasal support includes a connecting wire, one end of which is connected to the labial base of either the first palatal plate or the second palatal plate, and the other end of which is provided with a support portion that is inserted into the patient's nasal cavity, the support portion being spherical.

[0018] As a further technical solution, the tissue surface of the first palatal guard conforms to the morphology of the alveolar bone segment on the non-cleft side of the patient, and the tissue surface of the second palatal guard conforms to the morphology of the alveolar bone segment on the cleft side of the patient.

[0019] By adopting the above technical solution, the support part can be adjusted to support the nasal dome on the affected side in the patient's nasal cavity by adjusting the shape of the connecting wire, which can be flexibly and precisely controlled.

[0020] Secondly, the present invention provides a method for manufacturing a split adjustable nasoalveolar preoperative orthodontic appliance, applicable to a split adjustable nasoalveolar preoperative orthodontic appliance, the manufacturing method comprising the following steps: Obtain an impression of the patient’s maxillary alveolar bone and palate, pour a plaster model, and fabricate the first palatal guard and the second palatal guard based on the plaster model. The helical spring is installed between the first palatal plate and the second palatal plate, so that the two embedded ends are respectively installed on the first palatal plate and the second palatal plate; Based on the morphology of the patient's affected nasal cavity, at least one support portion of the nasal support is fabricated, and at least one connecting wire of the nasal support is selected. The support portion is installed at one end of the connecting wire, and the other end is installed on either the first palatal guard or the second palatal guard.

[0021] By adopting the above technical solutions, the manufacturing method of the patient's orthodontic appliance is clarified. The installation of the spiral spring ensures the controllability and repeatability between the first palatal guard and the second palatal guard. At the same time, the nasal bracket can be personalized and fixed according to the shape of the affected side, thereby realizing the coordinated correction of the patient's oral cavity and nasal cavity, and improving the adaptability, safety and correction efficiency of the orthodontic appliance.

[0022] Thirdly, the present invention provides an application of a split adjustable preoperative nasal alveolar appliance in the correction of nasolabial deformities and alveolar clefts.

[0023] Compared with the prior art, the beneficial effects of the present invention are: 1. This application utilizes the asymmetric elastic force distribution characteristics of the helical spring. During the use of the orthodontic appliance, while the medical tape is installed and an inward force is applied, the retraction force of the helical spring is preferentially transmitted to the non-cleft alveolar bone segment and the cleft alveolar bone segment of the patient through the first palatal guard and the second palatal guard, respectively. This simultaneously achieves the inward retraction of the non-cleft anterior alveolar bone segment and the lateral displacement of the cleft alveolar bone segment, thus enabling the simultaneous correction of asymmetric alveolar bone segment displacement under complete palatal constraint. 2. The orthodontic appliance of this application adopts a split modular design. The structure of each component is simple and easy to finely adjust. By changing the distance between the first palatal guard and the second palatal guard and the initial opening angle α of the spiral spring, the orthodontic appliance can be finely adjusted in three-dimensional space in multiple directions. This avoids the cumbersome process of adding or removing materials from the palatal guard, and simplifies and standardizes the operation process. 3. This application utilizes the structural design of a helical spring, which has better three-dimensional spatial control capabilities compared to a rigid expansion screw. It can independently adjust the first palatal guard plate and the second palatal guard plate connected to both sides, thereby allowing the displacement direction and amplitude of the alveolar bone segments on both sides to be adjusted independently. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the split adjustable nasoalveolar preoperative orthodontic appliance of the present invention. Figure 2 This is a schematic diagram of the preoperative structure of the split adjustable nasoalveolar orthodontic appliance of the present invention after wearing; Figure 3 This is a schematic diagram showing the state of the preoperative orthodontic appliance of the present invention, which is a split adjustable nasoalveolar dentistry, worn in the patient's mouth. Figure 4 (a) is a diagram of the alveolar arch morphology before correction using the split adjustable nasal alveolar preoperative orthodontic appliance of the present invention. Figure 4 (b) is a diagram of the alveolar arch morphology after correction using the preoperative orthodontic appliance of the present invention.

[0025] In the diagram: 1. First palatal guard; 2. Second palatal guard; 3. Helical spring; 31. Spring body; 32. Embedded end; 4. Nasal support; 41. Connecting wire; 42. Support; 5. Medical tape; 6. Alveolar bone segment on the non-cleft side; 7. Alveolar bone segment on the cleft side. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1-4 As shown, the specific solution of the embodiment is as follows: Example 1:

[0028] A split adjustable preoperative nasoalveolar appliance includes a first palatal guard 1 and a second palatal guard 2. A helical spring 3 is provided between the first palatal guard 1 and the second palatal guard 2. A nasal support 4 is provided on at least one of the first palatal guard 1 and the second palatal guard 2. The helical spring 3 is made of bent metal wire with a diameter of 0.8~1.0mm. The helical spring 3 includes a spring body 31 and embedded ends 32 located at both ends of the spring body 31. The two embedded ends 32 are respectively embedded in the first palatal guard 1 and the second palatal guard 2. The initial expansion force of the helical spring 3 is 1.5~2.0N and the initial opening angle α is 30~45°.

[0029] In use, the first palatal guard 1 and the second palatal guard 2 are made of medical-grade acrylic resin, and their tissue surfaces are tailored to the individual anatomical morphology of the patient's maxilla, such as... Figure 2 and Figure 4 As shown, the helical spring 3 is located on the palatal side of the patient's non-cleft alveolar bone segment 6 in the oral cavity. The helical spring 3 is preferably made of 0.9mm diameter medical stainless steel wire. The two embedded ends 32 are respectively embedded in the resin matrix of the second palatal guard 1 and the first palatal guard 2, with an embedding thickness of 2mm. The axis of the spring body 31 of the helical spring 3 is parallel to the mid-palatal suture. The initial expansion force of the helical spring 3 is calibrated to 1.5~2.0N by a force gauge, and the initial opening angle α is adjusted to 30~45°. This design adapts to the average range of alveolar bone segment angles on both sides for most patients, simultaneously achieving the retraction of the anterior portion of the non-cleft alveolar bone segment 6 and the lateral displacement of the cleft alveolar bone segment 7. Combined with the nasal support 4 to support the patient's nasal cavity, it applies a directional, controllable, and continuous lifting force to the collapsed and displaced nasal dome. Working in conjunction with the first palatal guard 1, the second palatal guard 2, and the spiral spring 3, it jointly corrects the patient's nasolabial deformity and alveolar cleft, reducing the risk of postoperative "flat nose" or "asymmetrical nose".

[0030] Based on the above embodiments, this application also has another embodiment, wherein the initial expansion force of the helical spring 3 is 1.0~3.0N and the initial opening angle α is 20~60°.

[0031] It should be noted that, due to individual differences in the angle between the alveolar bone segments on both sides of the patient, in order to cover the vast majority of patients, the initial expansion force range of the helical spring 3 is expanded to 1.0~3.0N and the initial opening angle α range is 20~60°.

[0032] In this embodiment, the nasal support 4 includes a connecting wire 41. One end of the connecting wire 41 is connected to the labial base of either the first palatal guard 1 or the second palatal guard 2. The other end of the connecting wire 41 is provided with a support portion 42 that is inserted into the patient's nasal cavity. The support portion 42 is spherical.

[0033] Among them, "spherical" refers to the outer surface of the support part 42 being a smooth curved surface, and the overall shape being approximately spherical, including but not limited to shapes such as spheres, ellipsoids, hemispheres, and gyrospheres.

[0034] Specifically, the connecting wire 41 in the nasal support 4 is made of medical stainless steel wire (preferably 0.9mm diameter medical stainless steel wire). One end of the wire is embedded in the labial base of either the first palatal guard plate 1 or the second palatal guard plate 2, and the other end extends along the nasal cavity. The end is provided with a spherical support part 42 made of acrylic resin to support the nasal dome on the affected side. During use, the height and angle of the nasal support 4 can be adjusted according to the shaping of the connecting wire 41. Example 2:

[0035] Based on the above embodiments, the present invention provides a method for manufacturing a split adjustable nasoalveolar preoperative orthodontic appliance, the method comprising the following steps: Obtain an impression of the patient's maxillary alveolar bone and palate, pour in a plaster model, and fabricate a first palatal guard 1 and a second palatal guard 2 based on the plaster model; install a helical spring 3 between the first palatal guard 1 and the second palatal guard 2, so that the two embedded ends 32 are respectively installed on the first palatal guard 1 and the second palatal guard 2; according to the morphology of the patient's affected nasal cavity, fabricate at least one support part 42 of a nasal support 4, select at least one connecting wire 41 of the nasal support 4, install the support part 42 at one end of the connecting wire 41, and install the other end on the first palatal guard 1 or the second palatal guard 2.

[0036] It should be noted that, under airway monitoring, the patient's head is tilted downwards and a silicone rubber impression is taken. The impression must completely cover the entire alveolar bone, palatal vault, and vestibule. Type IV dental plaster is poured in. The same technician completes the fabrication of the first palatal guard 1 and the second palatal guard 2 of the orthodontic appliance. Then, a metal wire (preferably a 0.9 mm diameter stainless steel wire) is bent into a helical spring 3, and the two embedded ends 32 of the helical spring 3 are respectively embedded in the resin matrix of the first palatal guard 1 and the second palatal guard 2, with an embedding thickness of ≥2 mm. It is installed in the patient's oral cavity with the spring body 31 of the helical spring 3 parallel to the palatal midline, and the edges of the first palatal guard 1 and the second palatal guard 2 are polished smooth. The nasal support 4 is placed inside the patient's nasal cavity. Depending on the patient's condition, the connecting wire 41 of the nasal support 4 is fixed in the labial base of the first palatal plate 1 or the second palatal plate 2, so that the connecting wire 41 extends along the direction of the nostril and the end is provided with a spherical support part 42 to support the nasal dome. For patients with unilateral cleft, a nasal support 4 is installed on the first palatal plate 1 on the alveolar segment 6 on the non-cleft side of the patient; for patients with bilateral cleft, a nasal support 4 is installed on the labial side of the first palatal plate 1 and the second palatal plate 2. Example 3:

[0037] Based on the above embodiments, the present invention provides an application of a split adjustable preoperative nasal alveolar appliance in the correction of nasolabial deformities and alveolar clefts, the specific application method including the following steps: Place the nasal brace 4 on the patient's affected side nasal cavity, and then place the first palatal guard 1 and the second palatal guard 2 into the patient's oral cavity, so that the tissue surface of the first palatal guard 1 fits against the alveolar bone segment 6 on the non-cleft side of the patient, and the tissue surface of the second palatal guard 2 fits against the alveolar bone segment 7 on the cleft side of the patient. Cut 5 pieces of medical tape, starting from the outer side of the base of the nasal ala on the affected side, and extend it towards the cheek to stick it to the outside of the patient's upper lip, applying continuous pressure to the patient's anterior jaw. Specifically, for patients with unilateral clefts, the traction force of medical tape 5 mainly acts on the anterior part of the alveolar bone segment 6 on the non-cleft side; for patients with bilateral clefts, the traction force acts on the entire anterior jaw, and medical tape 5 needs to be changed at least once a day to maintain its adhesiveness and fixation. Set the adjustment cycle for the orthodontic appliance until the patient's nasal alveolar aligner is corrected. Each time the appliance is adjusted, remove it and adjust the force exerted by the spiral spring 3 on the first palatal guard 1 and the second palatal guard 2, as well as the height and angle of the nasal support 4 in the patient's nasal cavity. After adjustment, put it back on and replace the medical tape 5. Regarding the adjustment cycle for orthodontic appliances, the optimal adjustment cycle is once a week, continuously for 12 weeks. Clinical verification shows that after 12 weeks of continuous adjustment of the appliances, the alveolar cleft width of patients was reduced by 91.7%, the T-shaped step malocclusion was completely corrected, and the intersegmental angle was restored from 112.6° to 123.5°. The effect is significant. See the experimental cases below and appendix for details. Figure 4 .

[0038] In addition, during each adjustment cycle of the orthodontic appliance, the method of adjusting the force applied by the spiral spring 3 to the first palatal guard 1 and the second palatal guard 2 is as follows: apply force to the two embedded ends 32 of the spiral spring 3 using spring widening pliers to widen the initial opening angle α of the spiral spring 3; at this time, the plate distance increment between the first palatal guard 1 and the second palatal guard 2 is ≤1.0mm, and the initial opening angle α of the spiral spring 3 is increased by 5~10°; after widening, manually verify the force symmetry of the range of motion of the first palatal guard 1 and the second palatal guard 2, and trim the end of the spiral spring 3.

[0039] It should be noted that the above describes the adjustment method for the spiral spring 3 during each adjustment process, which can change the distance between the first palatal guard plate 1 and the second palatal guard plate 2, and so on. Figure 1 and Figure 2 As shown in the initial opening angle α, this avoids the tedious cutting and adjustment of the integrated palatal guard during continuous treatment, allowing the appliance to be adjusted in a standardized manner to meet the patient's correction needs at different stages during the continuous adjustment period of treatment.

[0040] Furthermore, in orthodontic treatment, the cumulative daily wearing time is ≥20 hours, and the orthodontic appliance is cleaned after each meal. The continuous wearing period of the orthodontic appliance is 12~24 weeks.

[0041] Specifically, the above-mentioned constraints are because the medical tape 5 will inevitably become wet during the patient's eating process, which will affect the fixing strength of the medical tape 5. Therefore, the orthodontic appliance needs to be removed and cleaned after the patient finishes eating, and the medical tape 5 will be replaced when it is reinstalled. In this way, the standardized replacement operation of the medical tape 5 can effectively avoid the accidental dislodgement, loss or damage of the orthodontic appliance due to the medical tape 5 falling off or the failure of fixing, reduce the frequency of unplanned follow-up visits and re-installation, and ensure the orthodontic effect.

[0042] Furthermore, in orthodontic treatment, the continuous adjustment period for orthodontic appliances for patients with unilateral cleft lip is about 12 weeks, and for patients with bilateral cleft lip, the continuous adjustment period for orthodontic appliances is about 24 weeks. Therefore, the preferred range for the continuous adjustment period of orthodontic appliances is 12 to 24 weeks.

[0043] Experimental example: The patient was an 11-day-old female infant with a complete cleft lip and alveolar cleft. Pre-treatment examination revealed: left nasal ala collapse, nasal tip deviation of 2.5mm, cleft lip gap of 10.9mm, alveolar cleft gap of 4.8mm, presenting a T-shaped step deformity.

[0044]

[0045] As shown in the above measurement index table and Figure 4As shown in (a) and (b), after treatment, the T-shaped step deformity was completely corrected and the alveolar arch was restored to continuity; the cleft lip repair surgery (Millard procedure) was performed at 3 months of age, and the follow-up 40 days after the operation showed that the height of the nasal ala on the affected side (10.6 mm) was consistent with that on the non-cleft side, and the vermilion border of the lip was completely aligned.

[0046] The above results indicate that the orthodontic appliance provided by the present invention is effective in correcting nasolabial deformities and alveolar clefts during its continuous adjustment cycle, achieving alveolar arch remodeling and restoration of nasolabial symmetry, and creating favorable anatomical conditions for cleft lip repair surgery.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A split-type adjustable nasoalveolar preoperative orthodontic appliance, characterized in that, It includes a first palatal guard and a second palatal guard, with a helical spring between the first palatal guard and the second palatal guard, and a nasal support on at least one of the first palatal guard and the second palatal guard.

2. The split-type adjustable nasoalveolar preoperative orthodontic appliance according to claim 1, characterized in that, The helical spring is made of bent metal wire with a diameter of 0.8~1.0mm.

3. The split-type adjustable nasoalveolar preoperative orthodontic appliance according to claim 1, characterized in that, The helical spring includes a spring body and embedded ends located at both ends of the spring body, the two embedded ends being embedded in the first palatal guard and the second palatal guard, respectively.

4. The split-type adjustable nasoalveolar preoperative orthodontic appliance according to claim 1, characterized in that, The initial expansion force of the helical spring is 1.0~3.0N, and the initial opening angle α is 20~60°.

5. The split-type adjustable nasoalveolar preoperative orthodontic appliance according to claim 1, characterized in that, The initial expansion force of the helical spring is 1.5~2.0N, and the initial opening angle α is 30~45°.

6. The split-type adjustable nasoalveolar preoperative orthodontic appliance according to claim 3, characterized in that, After each force-induced widening of the two embedded ends, the initial opening angle α of the helical spring increases by 5~10°, and the plate spacing between the first palatal guard plate and the second palatal guard plate increases by ≤1.0mm.

7. The split-type adjustable nasoalveolar preoperative orthodontic appliance according to claim 1, characterized in that, The nasal support includes a connecting wire, one end of which is connected to the labial base of the first or second palatal plate, and the other end of which is provided with a support portion that is inserted into the patient's nasal cavity. The support portion is spherical.

8. The split-type adjustable nasoalveolar preoperative orthodontic appliance according to claim 1, characterized in that, The tissue surface of the first palatal guard conforms to the morphology of the alveolar bone segment on the non-cleft side of the patient, and the tissue surface of the second palatal guard conforms to the morphology of the alveolar bone segment on the cleft side of the patient.

9. A method for manufacturing a split adjustable nasoalveolar preoperative orthodontic appliance, applicable to the split adjustable nasoalveolar preoperative orthodontic appliance as described in any one of claims 1 to 8, characterized in that, The manufacturing method includes the following steps: Obtain an impression of the patient’s maxillary alveolar bone and palate, pour a plaster model, and fabricate the first palatal guard and the second palatal guard based on the plaster model. The helical spring is installed between the first palatal plate and the second palatal plate, so that the two embedded ends are respectively installed on the first palatal plate and the second palatal plate; Based on the morphology of the patient's affected nasal cavity, at least one support portion of the nasal support is fabricated, and at least one connecting wire of the nasal support is selected. The support portion is installed at one end of the connecting wire, and the other end is installed on the first palatal guard or the second palatal guard.

10. The application of a split adjustable nasal alveolar preoperative orthodontic appliance as described in any one of claims 1 to 8 in the correction of nasolabial deformities and alveolar clefts.

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