Invisible appliance for class III malocclusion

Abstract

The invention discloses an invisible appliance for class III malocclusion. The invisible appliance comprises an appliance main body structure, a stable occlusal pad, an appliance stable occlusal pad anastomosis window, an extension cavitation bubble, an appliance traction window, a traction device, a retention accessory cavitation bubble, a retention accessory and a force application device, the main body structure of the appliance is made of a transparent high polymer material, and the whole structure is integrally formed and used for connecting all parts of the appliance and assisting in beautifying and fixing; the stable occlusal pad is arranged in a rear tooth area of the upper dentition or the lower dentition and is used for providing an extension gap and a stable occlusal effect for teeth of the upper dentition and the lower dentition; the elongated cavitation has a fixed structural height, and the height is determined by the distance between the inner side wall of the elongated cavitation and a clinical dental crown reference point of the tooth; the appliance traction window is arranged on the cheek side surface, corresponding to teeth, of the elongated cavitation bubble and is used for mounting a traction device. The invention effectively solves the problems of contradiction between aesthetics and application range, insufficient correction stability, long treatment cycle, functional limitation, heavy economic and psychological burden of patients and the like of the existing appliance.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and in particular relates to an invisible orthodontic appliance for class III malocclusion. Background Art

[0002] Class III malocclusion is a common and complex type of dental deformity, characterized by mandibular protrusion, maxillary underdevelopment, or both, which leads to abnormal maxillofacial profile, disordered occlusion, and may cause oral dysfunction and psychological problems. Its causes include genetic factors and acquired bad habits, such as long-term thumb sucking, mouth breathing, or biting. The correction of Class III malocclusion requires comprehensive consideration of the overall adjustment of jaw development, dentition arrangement, and occlusion.

[0003] The existing Class III malocclusion correction technologies are mainly divided into removable appliances, traditional fixed appliances, surgical combined with orthodontic treatment, and invisible appliances. Removable appliances are mainly used in the period of deciduous teeth and replacement teeth. They adjust the jaw development through simple removable devices, but their effects are limited and it is difficult to deal with complex bone deformities. Traditional fixed appliances are suitable for the replacement teeth and permanent teeth. They provide correction force through brackets and archwires, and can effectively correct the dentition arrangement and occlusion relationship. However, their appearance is conspicuous and unsightly, and patients wear them for a long time and have poor comfort. For severe Class III malocclusion, surgical combined with orthodontic treatment is often required, but the operation is expensive and traumatic, and there is a long postoperative recovery time and the risk of complications, which increases the economic and psychological burden on patients. In recent years, invisible appliances have gradually been favored by patients because of their beauty and comfort. However, existing invisible appliances are mostly used for mild or moderate dentition problems, and there are significant limitations in the application of Class III malocclusion. For example, correction can be achieved by lowering the front teeth or lip-tilting the upper front teeth / lingually tilting the lower front teeth, but this solution has limited improvement in the patient's profile, a long correction period, and a narrow scope of application. In addition, the existing invisible braces are not ideal in controlling tooth rotation and providing stable occlusion, which often leads to unstable correction results.

[0004] In practical applications, the existing technologies still have problems such as the contradiction between aesthetics and scope of application, insufficient correction stability, long treatment cycle, functional limitations, and heavy economic and psychological burden on patients. Traditional fixed appliances have good effects in the treatment of Class III malocclusion, but their appearance is conspicuous and patients have low acceptance; although invisible appliances are beautiful, they have poor correction effects in complex deformities (such as Class III malocclusion). The existing invisible appliances are not stable enough when reconstructing the occlusal relationship, and are prone to problems such as uncontrolled tooth movement or rebound after correction, especially in the control of clockwise rotation of the mandible. The existing technologies mostly use a step-by-step approach to deal with dentition and jaw problems, with a long correction cycle, which increases the treatment burden and cooperation difficulty of patients. In addition, the existing invisible appliances are insufficient in providing elongation cavitation and tooth guidance, and cannot meet the full guidance and control requirements of complex deformities, affecting the efficiency and effect of correction. For patients with severe Class III malocclusion, surgical treatment is a common method, but surgical trauma and high costs make it difficult for some patients to accept. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an invisible orthodontic appliance for Class III malocclusion, which effectively solves the problems of the existing orthodontic appliances such as the contradiction between aesthetics and scope of application, insufficient correction stability, long treatment cycle, functional limitations, and heavy economic and psychological burden on patients.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: An invisible orthodontic appliance for class III malocclusion, comprising: an orthodontic main structure, a stable occlusal pad, an orthodontic stable occlusal pad anastomotic window, an elongated cavitation bubble, an orthodontic traction window, a traction device, a retention accessory cavitation bubble, a retention accessory, and a force application device; The main structure of the appliance is made of transparent polymer material, and the overall structure is formed in one piece, which is used to connect the various parts of the appliance and assist in aesthetics and retention; The stabilizing occlusal pad is set in the posterior area of ​​the upper or lower dentition to provide elongation space between the upper and lower dentition teeth and stabilize the occlusion; The elongated cavitation has a fixed structural height, which is determined by the distance between the medial wall of the elongated cavitation and the clinical crown reference point of the tooth; The traction window of the orthodontic appliance is arranged on the buccal side of the tooth corresponding to the elongated cavitation bubble, and is used for installing the traction device; The traction device is fixed to the tooth surface by bonding, and forms a traction connection with the opposing tooth through a force-applying device; The retention accessory cavitation is integrally formed with the main structure of the orthodontic appliance, and a retention accessory is arranged inside the cavitation cavitation to enhance the retention of the orthodontic appliance.

[0007] Preferably, the stable bite pad is bonded to the occlusal surface of the tooth through the invisible appliance bonding template, and the occlusal surface morphology thereof is consistent with the occlusal surface morphology of the clinical crown; The anastomotic window of the stable occlusal pad of the orthodontic appliance is hollow in design, and its buccolingual diameter and mesiodistal diameter are both larger than the corresponding sizes of the stable occlusal pad.

[0008] Preferably, the buccal-lingual diameter and the mesiodistal diameter of the elongated cavitation bubble are larger than the outer dimensions of the corresponding teeth to accommodate the gradual elongation of the teeth.

[0009] Preferably, the distance between the edge of the traction window of the orthodontic appliance and the bonding base plate of the traction device is 0.5-4.5 mm.

[0010] 5. The invisible braces according to claim 1, characterized in that: the retaining attachment is located on the buccal / lingual side of the tooth to which the stabilizing bite pad is bonded and the buccal / lingual side of the tooth at the mesial end of the elongated cavitation; The internal volume of the retention attachment cavity is larger than the external volume of the retention attachment, and its internal design forms a wrapping structure for accommodating and fixing the retention attachment.

[0011] Preferably, the force applying device is composed of an orthodontic elastic wire, one end of which is connected to the traction device and the other end is fixed to the corresponding tooth position.

[0012] Preferably, the transparent polymer material is made of medical-grade polycarbonate, polymethyl methacrylate or polyamide.

[0013] The present invention has novel structure, ingenious design, simple and convenient operation, and has the following advantages compared with the prior art: 1. This device ensures the stability of the occlusal relationship of the upper and lower dentition during the correction process through the coordinated design of the occlusal pad and the occlusal window of the appliance, and prevents poor results due to uncontrolled occlusal movement during the correction process. The occlusal pad can be flexibly set in the posterior area of ​​the upper or lower dentition according to the correction needs. Through the precise matching structural design, it is consistent with the occlusal surface of the teeth, improves wearing comfort, and realizes the clockwise rotation of the mandible, significantly improving the patient's maxillofacial profile.

[0014] 2. The elongated cavitation of this device has a fixed structural height, and its internal dimensions are precisely designed so that the teeth can be controlled and gradually moved in the elongated cavitation to achieve occlusal reconstruction. The elongated cavitation, which is integrally formed with the main structure of the orthodontic appliance, not only provides a trajectory guide for tooth movement, but can also be flexibly designed according to the specific morphology of the dentition. The elongation of each tooth can be controlled, effectively avoiding the problem of uncontrolled tooth movement or rebound after correction in the prior art.

[0015] 3. This device provides precise correction force through the combined action of the traction device and the force-applying device. At the same time, the retention attachment and the retention attachment cavitation are designed to enhance the stability of the device. The traction device is fixed to the tooth surface by bonding and forms a stable connection with the traction window of the appliance to ensure the precise transmission of the correction force; the retention attachment and the retention attachment cavitation form a wrapping structure, which effectively improves the fixation effect of the appliance, reduces the looseness or displacement that may occur during the patient's wearing process, and further improves the correction efficiency and comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of Class III malocclusion; Figure 2 is a schematic diagram of the occlusal relationship of the upper and lower jaws when the mandible rotates clockwise before correction; Figure 3 is a schematic diagram of the wax reconstruction of the upper and lower jaw occlusal relationship; FIG4 is a schematic diagram of the side structure of the attachment bonding template; Fig. 5 is a schematic diagram of the occlusal structure of the attachment bonding template; FIG6 is a schematic diagram of the side structure of the appliance; FIG7 is a schematic diagram of the occlusal structure of the appliance; Figure 8 is a schematic diagram of the relationship between the upper and lower dentitions without wearing the appliance after bonding the attachment; FIG9 is a schematic diagram of the relationship between the upper and lower dentitions when wearing the appliance after bonding the attachment; Figure 10 is a schematic diagram of the actual application of this technology (I) Figure 11 is a schematic diagram of the initial occlusal relationship between the upper and lower teeth Figure 12 is a schematic diagram of the upper and lower teeth after the original bonding device is removed Figure 13 is a schematic diagram of the actual application of this technology (II) Figure 14 is a schematic diagram of Class III malocclusion after correction Figure 15 is a schematic diagram of the details of the stable bite pad Figure 16 is a schematic diagram of the details of the elongated cavitation bubble In the attached figure: 1—main structure of the appliance; 2—stable occlusal pad; 3—stabilizing occlusal pad anastomotic window of the appliance; 4—elongation cavitation; 5—traction window of the appliance; 6—traction device; 7—retention attachment cavitation; 8—retention attachment; 9—force applying device. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0018] like Figure 1-16As shown, the present invention provides an invisible orthodontic appliance for Class III malocclusion, comprising: an orthodontic main structure 1, a stable occlusal pad 2, an orthodontic stable occlusal pad anastomotic window 3, an elongated cavitation bubble 4, an orthodontic traction window 5, a traction device 6, a retention accessory cavitation bubble 7, a retention accessory 8, and a force-applying device 9. The orthodontic main structure 1 is made of a transparent polymer material, and the overall structure is integrally formed, with an invisible and beautiful appearance. At the same time, the various functional components are organically combined through an integral molding design, which can not only meet complex correction needs, but also improve the wearing comfort of patients. The transparent polymer material is made of medical-grade polycarbonate, polymethyl methacrylate or polyamide, which has high transparency, high impact strength and good biocompatibility, and can maintain structural stability during long-term wearing of the orthodontic appliance, while reducing stimulation to the oral soft tissue of the patient, improving wearing comfort and continuity of correction effect. The stabilizing occlusal pad 2 is arranged in the posterior area of ​​the upper or lower dentition, and provides a stable occlusal gap between the upper and lower dentitions during the correction process through a structural design consistent with the morphology of the tooth occlusal surface, thereby achieving clockwise rotation control and maintaining stability of the mandible, thereby improving the patient's maxillofacial profile.

[0019] The elongated cavitation bubble 4 is integrally formed with the main structure 1 of the orthodontic appliance, and its height is determined by the distance between the inner wall of the elongated cavitation bubble 4 and the clinical crown reference point of the tooth, and is precisely designed according to the needs of dental correction. The elongated cavitation bubble 4 provides a guiding trajectory for tooth movement by controlling the internal dimensions, and effectively prevents the deviation of tooth movement during correction, thereby improving the correction accuracy and stability. The orthodontic traction window 5 is located on the buccal side of the tooth corresponding to the elongated cavitation bubble 4, and is used to install the traction device 6 through a predetermined structural design. The traction device 6 is fixed to the tooth surface by bonding, and transmits the correction force to the target tooth or dentition through the force-applying device 9 to achieve the correction goal. The force-applying device 9 is composed of an orthodontic elastic wire, one end of which is connected to the traction device 6, and the other end is fixed to the opposing dentition, and the progressive adjustment of the teeth is achieved through elastic force.

[0020] The retention attachment cavitation bubble 7 is integrally formed with the main structure 1 of the orthodontic appliance, and its internal design forms a wrapping structure for accommodating the retention attachment 8. The retention attachment 8 is fixed by fitting with the teeth, thereby enhancing the overall stability of the orthodontic appliance and preventing the orthodontic appliance from loosening or shifting during wearing. Through the above innovative design, the present invention not only improves the deficiencies of the existing orthodontic appliances in terms of aesthetics, scope of application, and stability of correction, but also significantly improves the correction efficiency and comfort of the patient, while shortening the correction cycle and reducing the economic and psychological burden on the patient.

[0021] The stable bite pad 2 is precisely bonded to the occlusal surface of the tooth through the invisible braces bonding template. Its shape is consistent with the occlusal surface shape of the clinical crown, ensuring the stability and adaptability of the bite pad in contact with the opposing teeth during occlusion. The design of the bonding template makes the bonding process of the stable bite pad simple and efficient, and can achieve accurate positioning to avoid the influence of deviations during installation on the correction effect. The height and position of the stable bite pad can be flexibly adjusted according to the correction needs. It can be set in the posterior area of ​​the upper or lower dentition to provide the necessary gap for the occlusion of the dentition to achieve the correction goal of clockwise rotation of the mandible.

[0022] The anastomotic window 3 of the appliance's stable occlusal pad is a hollow design that matches the stable occlusal pad. Its buccal-lingual diameter and mesiodistal diameter are larger than the corresponding sizes of the stable occlusal pad 2, ensuring that the occlusal pad maintains sufficient space for movement in the hollow area while avoiding structural deformation or inconvenience in use due to limitations on the appliance's materials. The anastomotic window 3 is integrally formed with the appliance's main structure 1, enhancing the overall strength and durability of the appliance. The edges of the anastomotic window have been optimized to reduce irritation to the patient's oral mucosa and gums, further improving wearing comfort.

[0023] The internal design of the elongation cavitation bubble 4 fully considers the movement trajectory of the teeth during the correction process. Its buccal-lingual diameter and mesiodistal diameter are larger than the external dimensions of the corresponding teeth, thereby providing sufficient space to accommodate the gradual elongation of the teeth. The elongation cavitation bubble 4 is integrally formed with the main structure 1 of the orthodontic appliance, and has good structural stability. Its internal dimensions are precisely calculated, and the elongation can be flexibly designed according to the correction requirements of each tooth, ensuring that the movement process of the teeth is controlled and accurate, and avoiding movement obstruction or uneven correction caused by insufficient cavitation size.

[0024] The height of the elongated cavitation bubble 4 is determined by the distance between the clinical crown reference point and the inner wall reference point of the elongated cavitation bubble. This height design can provide a precise guiding trajectory for the teeth, while maintaining the stability of the moving direction during the gradual elongation of the teeth. In order to further improve the correction effect, the inner wall of the elongated cavitation bubble 4 is designed to be a smooth structure, which reduces the friction between the teeth and the appliance during the elongation process, thereby reducing the correction resistance and improving the correction efficiency.

[0025] In addition, the elongated cavitation 4 realizes the dynamic adjustment of the whole dentition through the synergistic effect with the stable occlusal pad 2 and the traction window 5 of the orthodontic appliance. Under the joint action of the traction device 6 and the force-applying device 9, the teeth can gradually fill the elongated cavitation 4, thereby completing the effective elongation of the teeth and the reconstruction of the occlusal relationship. This design not only significantly improves the correction accuracy, but also enhances the applicability of the orthodontic appliance in complex dental and maxillofacial deformities, providing patients with a more efficient and stable correction experience. Through the reasonable design of the elongated cavitation 4, the present invention can meet the correction needs of Class III malocclusion, especially in improving the control of tooth movement and the correction effect. It shows significant advantages.

[0026] The distance between the edge of the appliance traction window 5 and the bonding base plate of the traction device 6 is set to 0.5~4.5mm, and the stable installation of the traction device and the accurate transmission of the correction force are ensured through reasonable spacing design. The traction window 5 is integrally formed with the appliance main structure 1, and its position and size are precisely designed according to the actual correction needs of the teeth to adapt to the arrangement of different dentitions and correction goals. This structure can ensure that the traction device is firmly fixed during use, while avoiding interference caused by too close bonding positions or traction force failure caused by too far bonding positions.

[0027] The traction device 6 is fixed to the buccal side of the tooth by bonding, and forms a traction connection with the opposing tooth through the force-applying device 9. The bonding base plate of the traction device is designed to be a smooth structure, which can fit closely with the tooth surface to ensure bonding stability while reducing potential damage to the tooth surface. The matching design of the traction device and the traction window of the orthodontic appliance can effectively avoid falling off or displacement during the traction force transmission process, thereby improving the reliability of the correction effect.

[0028] The edge of the traction window 5 has been optimized to provide sufficient bonding area while avoiding possible irritation or damage to the patient's oral mucosa caused by sharp edges. In addition, the size design of the traction window complements the elongated cavitation bubble 4, which can provide a clear path guide for the movement of the teeth and ensure that the overall correction goal of the dentition is achieved. Through the synergistic effect of the traction device 6 and the force-applying device 9, the appliance can not only provide precise correction force, but also adjust the force direction and strength according to the staged needs of dentition correction, significantly improving the correction efficiency and patient comfort.

[0029] The retention attachment 8 is installed on the buccal / lingual side of the teeth where the occlusal pad 2 is bonded and stabilized, and on the buccal / lingual side of the teeth near the middle of the designed elongated cavitation bubble 4. The overall fixation performance of the appliance is effectively enhanced by the reasonable arrangement of the position. The retention attachment 8 is made of a material compatible with the tooth surface, and its surface is treated to provide good bonding performance and durability. It can be fixed on the tooth surface stably for a long time to prevent falling off or displacement caused by patient activities or correction force. The design of the retention attachment takes into account the stability of the fixation of the appliance and the wearing comfort of the patient, avoiding the discomfort that may occur during the correction process.

[0030] The internal volume of the retention attachment cavitation 7 is slightly larger than the external volume of the retention attachment 8, and its design forms a wrapping structure for accurately accommodating and fixing the retention attachment 8. The interior of the cavitation is optimized to provide sufficient space for the retention attachment to move while ensuring its stability in the main structure 1 of the appliance. The wrapping structure is designed to be integrally formed with the main body of the appliance, so that the retention attachment can remain fixed as the appliance moves as a whole during the correction process to avoid loosening or falling off. The edges of the retention attachment cavitation 7 are rounded, which not only improves the comfort of the patient when wearing it, but also reduces the mucosal irritation that may be caused by oral friction.

[0031] The coordinated design of the retention attachment 8 and the retention attachment cavitation 7 not only improves the retention performance of the appliance, but also enhances the adaptability of the appliance in adjusting complex occlusal relationships. During the correction process, the precise positioning of the retention attachment can ensure the stability of the appliance in the dentition and avoid the problem of dispersion of correction force or decreased transmission efficiency. In addition, the wrapping structure of the retention attachment cavitation can effectively resist the impact of external forces on the retention attachment and extend the service life of the appliance. Through the synergistic effect of the retention attachment and the retention attachment cavitation, the present invention achieves dual optimization of the fixation and comfort of the appliance, providing a more reliable technical guarantee for the correction of Class III malocclusion.

[0032] The force-applying device 9 is composed of orthodontic elastic wires, which are reasonably designed and can provide continuous and stable correction force to achieve gradual adjustment of the teeth. One end of the force-applying device is connected to the target tooth through the traction device 6, and the other end is fixed to the corresponding tooth or dentition structure. Through the elastic characteristics of the orthodontic elastic wire, the smooth transmission of the correction force is maintained during the force application process. The force value of the elastic wire can be customized according to the correction needs of different patients to meet the specific requirements of tooth movement and occlusal relationship reconstruction in the correction of Class III malocclusion.

[0033] Orthodontic elastic wires are made of highly elastic and durable synthetic materials with excellent fatigue resistance. They can maintain elastic stability for a long time and avoid poor correction effects caused by force attenuation during correction. The surface of the elastic wires is specially treated to reduce friction with other components or oral soft tissues when applying force, thereby improving the patient's wearing comfort and reducing the degree of wear of the appliance during use, thereby extending its service life.

[0034] The installation position and direction of the force-applying device 9 are precisely designed, and the magnitude and direction of the force can be adjusted according to the staged needs of dentition correction to ensure the gradual achievement of the correction goal. During the correction process, the force provided by the elastic wire can effectively control the movement trajectory of the teeth, while avoiding damage to the teeth or surrounding tissues caused by excessive correction force. Through the coordinated effect with the traction device 6 and the appliance traction window 5, the force-applying device can efficiently transmit the correction force to the target teeth, ensuring the overall coordination of the dentition and the stability of the correction process.

[0035] Example 1: Design and production in the technical studio 1. Reference Figure 3-4 , reconstruct the upper and lower occlusal relationship and make upper and lower jaw occlusal wax. It is required that the teeth in the upper and lower jaw anterior teeth area remain in a non-contact state, and the distance between the incisor tip of the teeth in the upper jaw anterior teeth area and the incisor tip of the teeth in the lower jaw anterior teeth area is maintained between ±1 mm and 3 mm.

[0036] 2. According to the occlusal relationship of the upper and lower jaws and the prepared upper and lower jaw occlusal wax, design the tooth position for bonding the stable bite pad, and determine the height of the stable bite pad based on the distance relationship between the incisal ends of the teeth in the upper and lower anterior teeth area to ensure that the stable bite pad can provide accurate occlusal clearance and stability.

[0037] 3. The design height of the elongated cavitation is determined by the distance between the clinical crown reference point and the inner wall reference point of the elongated cavitation, which is called the design height of the elongated cavitation. When designing, it is necessary to ensure that the positions of the clinical crown reference point and the inner wall reference point of the elongated cavitation are completely consistent to ensure the effectiveness of the design. The specific calculation method is divided into the following two methods according to the actual clinical situation: Case 1: When the upper and lower anterior teeth do not need to be indented and only the posterior teeth need to be elongated, the calculation formula is: (Stable bite pad height - invisible brace appliance thickness - normal overbite of anterior teeth 0.5 to 1 mm ± iatrogenic opening and closing height of upper and lower anterior teeth) = design height of elongated cavitation bubble.

[0038] Case 2: The calculation formula for lowering the upper and lower anterior teeth is: (Stable bite pad height - invisible brace appliance thickness - upper and lower anterior teeth intrusion - normal anterior teeth overbite 0.5 to 1 mm ± iatrogenic upper and lower anterior teeth opening and closing height) = elongated cavitation design height.

[0039] After determining the design height of the elongated cavitation according to the above formula, the elongated cavitation is manufactured according to the calculation results.

[0040] 4. With reference to the above requirements, design the structures of the appliance's stable occlusal pad anastomosis window, appliance traction window, retention accessory cavitation bubble and retention accessory, etc., to ensure that each component has a clear function and fits tightly in the appliance.

[0041] 5. Based on the above design, make the accessory bonding template and invisible braces.

[0042] Note: The accessory bonding template must include a cavitation design for a stable bite pad, while the invisible braces do not need to have a cavitation design for a stable bite pad. The invisible braces need to have a stable bite pad anastomosis window, while the accessory bonding template does not need to have an anastomosis window.

[0043] 6. Invisible braces can be equipped with other design functions such as distalization of molars, adjustment of labial inclination of teeth or arch expansion according to actual clinical needs to meet different correction needs.

[0044] 7. All of the above designs can be completed through 3D digital technology, which can accurately simulate the movement trajectory of teeth, simplify the clinical operation design process, and improve the accuracy and efficiency of orthodontic appliance production.

[0045] Example 2: Clinical practice 1. Clean and etch the tooth surfaces that need to be bonded with stable occlusal pads, traction devices and retention accessories to ensure that the tooth surfaces are free of contamination and moderately moist to provide the best bonding conditions and ensure the firmness of the orthodontic appliance components.

[0046] 2. Use the attachment bonding template to accurately bond the stable bite pad, traction device and retention attachment to the designated position of the corresponding teeth. The stable bite pad is usually bonded to the occlusal surface of the posterior teeth to provide the necessary occlusal gap; the traction device is fixed to the buccal side of the target tooth for connecting the force-applying device; the retention attachment is bonded to the buccal and lingual side of the tooth to improve the stability and wearing comfort of the appliance. The design of the bonding template ensures the accuracy and efficiency of the operation and reduces the complexity of clinical operations.

[0047] 3. After wearing the invisible braces, connect one end of the force-applying device to the traction device on the surface of the upper and lower teeth, and fix the other end to the opposing teeth. The force-applying device gradually adjusts the movement trajectory and occlusion relationship of the teeth through elastic traction, while maintaining the overall coordination of the entire braces system.

[0048] 4. Follow up every two weeks, focus on checking the movement of the teeth and whether there is any obstruction in the elongation cavitation, and confirm whether the force value of the force-applying device is within the appropriate range. If necessary, the elastic force value or component position of the force-applying device can be adjusted according to the actual correction situation to ensure the stability and continuity of the correction effect.

[0049] Principle of the Invention The design of the present invention is based on the principle of "three points form a plane" and combines the story of "the donkey falling into the well" to closely combine tooth movement with occlusal adjustment. The "three points" include stable occlusal pads in the bilateral posterior tooth area and the contact surfaces of the orthodontic appliances in the upper and lower anterior tooth areas, which together form an imaginary plane to temporarily stabilize the occlusal relationship of the upper and lower dentitions and provide the necessary conditions for subsequent occlusal reconstruction. Under the coordinated action of the traction device and the force-applying device, the teeth gradually elongate, similar to a "donkey" shaking off the dirt on its body, and gradually fill the elongated cavities. As the correction proceeds, the imaginary plane gradually transforms into a real plane, the maxillary dental arch rotates counterclockwise, and the mandibular dental arch and mandible rotate clockwise.

[0050] This rotation adjustment not only reconstructs the stable occlusal relationship of the upper and lower jaws, but also improves the patient's chin appearance through the clockwise rotation of the mandible, achieving the goal of adjusting the SNB angle and correcting Class III malocclusion. Through the above principle, the present invention can efficiently complete the correction of complex occlusal problems, while reducing the uncertainty in the correction process, significantly improving the stability of the correction effect and the patient's treatment experience.

[0051] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An invisible orthodontic appliance for class III malocclusion, characterized in that: include: The main structure of the appliance (1), a stable occlusal pad (2), an anastomotic window of the stable occlusal pad of the appliance (3), an elongation cavity (4), a traction window of the appliance (5), a traction device (6), a retention attachment cavity (7), a retention attachment (8), and a force application device (9); The main structure (1) of the appliance is made of transparent polymer material, and the overall structure is formed in one piece, which is used to connect the various parts of the appliance and assist in aesthetics and retention; The stabilizing occlusal pad (2) is arranged in the posterior tooth area of ​​the upper dentition or the lower dentition, and is used to provide an elongation gap between the teeth of the upper and lower dentitions and to stabilize the occlusion; The elongated cavitation bubble (4) has a fixed structural height, and its height is determined by the distance between the inner wall of the elongated cavitation bubble (4) and the clinical crown reference point of the tooth; The orthodontic appliance traction window (5) is arranged on the buccal side of the tooth corresponding to the elongated cavitation bubble (4) and is used for installing the traction device (6); The traction device (6) is fixed to the tooth surface by bonding, and forms a traction connection with the opposing tooth through the force applying device (9); The retention attachment cavities (7) are integrally formed with the main structure (1) of the orthodontic appliance, and a retention attachment (8) is arranged therein to enhance the retention of the orthodontic appliance.

2. The invisible appliance for class III malocclusion according to claim 1, characterized in that: The stable occlusal pad (2) is bonded to the occlusal surface of the tooth through the invisible brace bonding template, and the occlusal surface shape is consistent with the occlusal surface shape of the clinical crown; The anastomotic window (3) of the orthodontic appliance stable occlusal pad is of hollow design, and its buccal-lingual diameter and mesiodistal diameter are both larger than the corresponding dimensions of the stable occlusal pad (2).

3. The invisible appliance for class III malocclusion according to claim 1, characterized in that: The internal buccolingual and mesiodistal diameters of the elongation cavities (4) are larger than the external dimensions of the corresponding teeth to accommodate the gradual elongation of the teeth.

4. The invisible appliance for class III malocclusion according to claim 1, characterized in that: The distance between the edge of the traction window (5) of the orthodontic appliance and the bonding base plate of the traction device (6) is 0.5 to 4.5 mm.

5. The invisible appliance for class III malocclusion according to claim 1, characterized in that: The retention attachment (8) is located on the buccal / lingual side of the tooth to which the stabilizing bite pad (2) is bonded and on the buccal / lingual side of the tooth mesial to the designed elongated cavitation (4); The internal volume of the retention attachment cavity (7) is greater than the external volume of the retention attachment (8), and its internal design forms a wrapping structure for accommodating and fixing the retention attachment (8).

6. The invisible appliance for class III malocclusion according to claim 1, characterized in that: The force applying device (9) is composed of an orthodontic elastic wire, one end of which is connected to the traction device (6) and the other end is fixed to the corresponding tooth position.

7. The invisible appliance for class III malocclusion according to claim 1, characterized in that: The transparent polymer material is made of medical-grade polycarbonate, polymethyl methacrylate or polyamide.

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