Invisible appliance for class III malocclusion

Abstract

The utility model 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 of the elongated cavitation 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 utility model solves the problems of contradiction between aesthetics and application range, insufficient correction stability, long treatment period, functional limitation and the like of the existing appliance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of medical apparatus and instruments, and particularly relates to a kind of for III malocclusion. BACKGROUND

[0002] III malocclusion is a common and complex type of dental malformation, characterized by mandibular prognathism, maxillary hypoplasia or both, leading to abnormal facial appearance and occlusal disturbance in patients, and may cause oral dysfunction and psychological problems. Its causes include genetic factors and acquired bad habits, such as long-term finger sucking, mouth breathing or biting objects. The treatment of III malocclusion patients needs to consider the overall adjustment of jaw development, tooth arrangement and occlusal relationship.

[0003] The existing III malocclusion correction techniques mainly include removable appliances, traditional fixed appliances, surgical orthodontic treatment and invisible aligners. Removable appliances are mainly used for deciduous and mixed dentition periods, and can adjust jaw development through simple removable devices, but the effect is limited and it is difficult to handle complex skeletal deformities. Traditional fixed appliances are suitable for mixed dentition and permanent dentition periods, and can effectively correct tooth arrangement and occlusal relationship through brackets and arch wires. However, it is not aesthetically pleasing and the patient has to wear it for a long time, which is not comfortable. For severe III malocclusion, surgical orthodontic treatment is often used, but the cost is high, the trauma is large, and there is a long recovery time and risk of complications, which increases the economic and psychological burden of patients. In recent years, invisible aligners have gradually gained popularity among patients due to their aesthetic and comfortable nature. However, existing invisible aligners are mainly used for mild or moderate tooth problems, and have significant limitations in the application of III malocclusion. For example, by lowering the front teeth or tilting the upper front teeth / lower front teeth, the treatment can be achieved, but this scheme has limited improvement in patient appearance, long treatment period and narrow application range. In addition, the existing invisible aligners are not ideal in controlling tooth rotation and providing stable occlusion, often leading to unstable treatment results.

[0004] The prior art has problems of contradiction between appearance and application range, insufficient correction stability, long treatment cycle, functional limitation, heavy economic and psychological burden of patients, etc. in practical application. Traditional fixed orthodontic appliances have good effect in the treatment of class III malocclusion, but are conspicuous in appearance and have low acceptance of patients. Although invisible orthodontic appliances are beautiful, they have poor correction effect in complex deformities (such as class III malocclusion). The existing invisible orthodontic appliances have insufficient stability in occlusal relationship reconstruction, and problems of uncontrolled tooth movement or rebound after correction easily occur, especially in the control of clockwise rotation of the mandible. The existing technology adopts a step-by-step treatment of dentition and jaw problems, which prolongs the treatment cycle and increases the treatment burden and cooperation difficulty of patients. In addition, the existing invisible orthodontic appliances have insufficient functions in providing elongation cavities and tooth guidance, and cannot meet the whole-process 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 means, but surgical trauma and high cost make it difficult for some patients to accept. Practical new type content

[0005] The utility model provides a kind of invisible orthodontic appliance for class III malocclusion, effectively solve the contradiction between the appearance and application range of existing appliance, insufficient correction stability, long treatment cycle, functional limitation and the problems such as heavy economic and psychological burden of patients.

[0006] To solve the above problems, the technical scheme adopted by the utility model is:

[0007] An invisible orthodontic appliance for class III malocclusion, comprising: an appliance main structure, a stable occlusion pad, an appliance stable occlusion pad anastomosis window, an elongation cavity, an appliance traction window, a traction device, a retention accessory cavity, a retention accessory, and a force application device.

[0008] The appliance main structure is made of transparent polymer material, and the overall structure is integrally formed to connect the parts of the appliance and assist in appearance and retention.

[0009] The stable occlusion pad is arranged in the posterior region of the upper or lower dentition, and is used to provide elongation gaps and stable occlusion for the upper and lower dentition.

[0010] The elongation cavity has a fixed structure height, which is determined by the distance between the inner side wall of the elongation cavity and the clinical crown reference point of the tooth.

[0011] The appliance traction window is arranged on the buccal side of the tooth corresponding to the elongation cavity, and is used to install the traction device.

[0012] The traction device is fixed on the surface of the tooth by adhesion, and is connected with the opposite tooth by the force application device.

[0013] The retention accessory bubble is integrally formed with the main structure of the appliance, and the retention accessory is arranged in the bubble to enhance the retention of the appliance.

[0014] Preferably, the stable bite pad is bonded to the occlusal surface of the teeth by the invisible aligner bonding template, and the occlusal surface shape is consistent with the clinical crown occlusal surface shape.

[0015] The stable bite pad of the appliance is designed with a hollow window, and the buccal-lingual diameter and the mesial-distal diameter of the window are larger than the corresponding dimensions of the stable bite pad.

[0016] Preferably, the internal buccal-lingual diameter and the mesial-distal diameter of the elongation bubble are larger than the external dimensions of the corresponding teeth to accommodate the gradual elongation of the teeth.

[0017] Preferably, the distance between the edge of the appliance traction window and the bonding pad of the traction device is 0.5-4.5mm.

[0018] The retention accessory is arranged on the buccal / lingual side of the teeth to which the stable bite pad is bonded and on the buccal / lingual side of the teeth at the mesial end of the elongation bubble.

[0019] The internal volume of the retention accessory bubble is larger than the external volume of the retention accessory, and the internal design forms a wrapping structure to accommodate and fix the retention accessory.

[0020] Preferably, the force application device is composed of orthodontic elastic wires, one end of which is connected to the traction device and the other end of which is fixed to the corresponding tooth position.

[0021] Preferably, the transparent high molecular material is made of medical grade polycarbonate, polymethyl methacrylate or polyamide.

[0022] The utility model discloses novel structure, clever idea, simple and convenient operation has the following advantages compared with prior art:

[0023] 1. The device is designed with a stable bite pad and a stable bite pad window of the appliance, which ensures the stable occlusion relationship of the upper and lower dental arches during the treatment process and prevents poor results caused by uncontrolled occlusion movement during the treatment process. The stable bite pad is flexibly arranged in the posterior region of the upper or lower dental arch according to the treatment requirements, and the structure is accurately matched to keep consistent with the occlusal surface of the teeth, improve the wearing comfort, and realize the clockwise rotation of the mandible, thereby significantly improving the patient's facial appearance.

[0024] 2. The elongation bubble of the device has a fixed structure height, and the internal dimensions are accurately designed to enable the teeth to move gradually and realize occlusion reconstruction in the elongation bubble. The elongation bubble integrally formed with the main structure of the appliance not only provides trajectory guidance for tooth movement, but also can be flexibly designed according to the specific morphology of the dental arch, and the elongation of each tooth is controllable, thereby effectively avoiding the problems of uncontrolled tooth movement and rebound after treatment in the prior art.

[0025] 3. The device provides precise correction force through the combined action of the traction device and the force application device, and is designed with retention accessories and retention accessory air bubbles to enhance device stability. The traction device is fixed to the tooth surface by adhesion and forms a stable connection with the traction window of the appliance, ensuring accurate transmission of the correction force; the retention accessories and retention accessory air bubbles form a wrapping structure, effectively improving the fixation effect of the appliance, reducing the possibility of loosening or displacement during patient wear, and further improving the correction efficiency and comfort. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of a Class III malocclusion;

[0027] Figure 2 is a schematic diagram of the occlusal relationship between the upper and lower dental arches when the lower jaw rotates clockwise before correction;

[0028] Figure 3 is a schematic diagram of the reconstruction of the upper and lower occlusal relationship wax;

[0029] Figure 4 is a schematic diagram of the side structure of the attachment bonding template;

[0030] Figure 5 is a schematic diagram of the occlusal surface structure of the attachment bonding template;

[0031] Figure 6 is a schematic diagram of the side structure of the appliance;

[0032] Figure 7 is a schematic diagram of the occlusal surface structure of the appliance;

[0033] Figure 8 is a schematic diagram of the relationship between the upper and lower dental arches after bonding the attachment without wearing the appliance;

[0034] Figure 9 is a schematic diagram of the relationship between the upper and lower dental arches after bonding the attachment and wearing the appliance;

[0035] Figure 10 is a schematic diagram of the actual application of the technology (one)

[0036] Figure 11 is a schematic diagram of the preliminary establishment of the occlusal relationship between the upper and lower dental arches

[0037] Figure 12 is a schematic diagram of the upper and lower dental arches after removing the original bonding device

[0038] Figure 13 is a schematic diagram of the actual application of the technology (two)

[0039] Figure 14 is a schematic diagram of the end of the correction of Class III malocclusion

[0040] Figure 15 is a schematic diagram of the details of the stable occlusal pad

[0041] Figure 16 is a schematic diagram of the details of the elongated air bubble

[0042] In the drawing: 1 - main structure of the appliance; 2 - stabilizing bite pad; 3 - appliance stabilizing bite pad anastomosis window; 4 - elongation cavity; 5 - appliance traction window; 6 - traction device; 7 - retention accessory cavity; 8 - retention accessory; 9 - force application device. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present application, and the technical solutions of the present application are further described in combination with the drawings, but the present application is not limited to these embodiments.

[0044] As Figures 1-16 shown, the present application provides a kind of for class III malocclusion invisible aligner, comprising: appliance main structure 1, stabilizing bite pad 2, appliance stabilizing bite pad anastomosis window 3, elongation cavity 4, appliance traction window 5, traction device 6, retention accessory cavity 7, retention accessory 8, force application device 9.Appliance main structure 1 is made of transparent high molecular material, integral structure is integrally formed, with the appearance of invisible beautiful, simultaneously by integrally formed design organically combines each functional component, both can satisfy complex correction demand, can also improve the wearing comfort of patient.The transparent high molecular material is made of medical grade polycarbonate, polymethyl methacrylate or polyamide, the material has high transparency, high impact strength and good biocompatibility, can keep structural stability during long-term wearing of appliance, while reducing the irritation to the soft tissue of patient's oral cavity, improve the comfort of wearing and the persistence of correction effect.Stabilizing bite pad 2 is arranged in upper dentition or lower dentition posterior region, by the structural design consistent with the form of tooth occlusal surface, provide stable upper and lower dentition occlusal gap during the correction process, to realize the clockwise rotation control of mandible and keep stable, to improve the patient's jaw profile.

[0045] Elongation cavity 4 is integrally formed with appliance main structure 1, its height is determined by the distance between the inner side wall of elongation cavity 4 and the clinical crown reference point of tooth, and is accurately designed according to the tooth correction requirement.Elongation cavity 4 provides a guide track for tooth movement by controlling the internal size, effectively prevents the deviation of tooth movement during the correction process, improves the correction accuracy and stability.Appliance traction window 5 is located on the buccal side of the tooth corresponding to elongation cavity 4, and is used for installing traction device 6 by predetermined structural design.Traction device 6 is fixed on the surface of tooth by bonding, and transmits correction force to target tooth or dentition by force application device 9, to realize the correction target.Force application device 9 is composed of orthodontic elastic wire, one end of which is connected with traction device 6, and the other end is fixed on the opposite dentition, to realize the progressive adjustment of tooth by elastic force.

[0046] The retention accessory cavity 7 is integrally formed with the main structure of the appliance 1, and a wrapping structure is designed inside to accommodate the retention accessory 8. The retention accessory 8 is fixed by fitting with the teeth, thereby enhancing the overall stability of the appliance and preventing the appliance from loosening or shifting during wearing. Through the above innovative design, the appliance improves the deficiencies of the existing appliance in terms of appearance, application range and treatment stability, and significantly improves the treatment efficiency and the comfort of the patient wearing, while shortening the treatment cycle and reducing the economic and psychological burden of the patient.

[0047] The stable bite pad 2 is accurately bonded to the occlusal surface of the teeth through the invisible appliance bonding template, and its shape is consistent with the shape of the clinical crown occlusal surface, thereby 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 deviation during installation on the treatment effect. The height and position of the stable bite pad can be flexibly adjusted according to the treatment requirements, and can be arranged in the posterior region of the upper or lower dentition to provide the necessary gap for the occlusion of the dentition, so as to achieve the treatment goal of clockwise rotation of the mandible.

[0048] The appliance stable bite pad matching window 3 is designed to be hollow and matched with the stable bite pad, and the buccal-lingual diameter and the mesial-distal diameter are larger than the corresponding sizes of the stable bite pad 2, so as to ensure that the bite pad has sufficient space for movement in the hollow area, while avoiding structural deformation or inconvenience due to material limitations of the appliance. The matching window 3 is integrally formed with the main structure of the appliance 1, thereby enhancing the overall strength and durability of the appliance. The edge of the matching window is optimized to reduce irritation to the patient's oral mucosa and gums, further improving the comfort of wearing.

[0049] The internal design of the elongation cavity 4 fully considers the movement trajectory of the teeth during treatment, and the buccal-lingual diameter and the mesial-distal diameter are larger than the external size of the corresponding teeth, thereby providing sufficient space for the gradual elongation of the teeth. The elongation cavity 4 is integrally formed with the main structure of the appliance 1, has good structural stability, and its internal size is accurately calculated to flexibly design the elongation according to the treatment requirements of each tooth, thereby ensuring that the movement of the teeth is controlled and accurate, and avoiding movement obstacles or uneven treatment caused by insufficient cavity size.

[0050] The height of the elongation cavity 4 is determined by the distance between the clinical crown reference point and the inside wall reference point of the elongation cavity, which can provide an accurate guide trajectory for the teeth and maintain the stability of the movement direction during the gradual elongation of the teeth. In order to further improve the treatment effect, the inside wall of the elongation cavity 4 is designed to be smooth, thereby reducing the friction between the teeth and the appliance during elongation, thereby reducing the treatment resistance and improving the treatment efficiency.

[0051] In addition, the elongation cavity 4 realizes the dynamic adjustment of the whole dentition through the cooperation with the stable bite pad 2 and the appliance traction window 5. Under the joint action of the traction device 6 and the force applying device 9, the teeth can gradually fill the elongation cavity 4, thereby completing the effective elongation of the teeth and the reconstruction of the occlusal relationship. The design not only significantly improves the treatment accuracy, but also enhances the applicability of the appliance in complex dental malformations, providing a more efficient and stable treatment experience for the patient. Through the reasonable design of the elongation cavity 4, the utility model can meet the treatment needs of class III malocclusion, especially in improving the control force of tooth movement and the treatment effect.

[0052] The distance between the edge of the appliance traction window 5 and the adhesive bottom plate of the traction device 6 is set to 0.5-4.5mm, which ensures the stable installation of the traction device and the accurate transmission of the treatment force through reasonable spacing design. The traction window 5 is integrally formed with the appliance main structure 1, and its position and size are accurately designed according to the actual treatment needs of the teeth to adapt to the arrangement of different dentitions and treatment goals. This structure can ensure the firm fixation of the traction device during use, while avoiding the interference caused by too close bonding position or the traction force failure caused by too far bonding position.

[0053] The traction device 6 is fixed on the buccal side of the tooth through adhesion, and is connected with the opposite tooth through the force applying device 9. The adhesive bottom plate of the traction device is designed as a smooth structure, which can closely fit the tooth surface to ensure the adhesion stability and reduce the potential damage to the tooth surface. The matching design of the traction device and the appliance traction window can effectively avoid the phenomenon of falling off or displacement during the transmission of the traction force, improving the reliability of the treatment effect.

[0054] The edge of the traction window 5 is optimized to provide sufficient bonding area and avoid the irritation or damage to the patient's oral mucosa caused by sharp edges. In addition, the size design of the traction window is complementary to the elongation cavity 4, which can provide clear path guidance for the movement of the teeth to ensure the realization of the overall treatment goal of the dentition. Through the cooperation of the traction device 6 and the force applying device 9, the appliance not only provides accurate treatment force, but also adjusts the force direction and intensity according to the phased needs of the dentition treatment, significantly improving the treatment efficiency and the comfort of the patient wearing.

[0055] The retention accessory 8 is installed on the buccal / lingual side of the bonding stabilization bite pad 2 and the buccal / lingual side of the mesial end tooth of the designed elongated cavity 4, which effectively enhances the overall fixation performance of the appliance by reasonable arrangement. The retention accessory 8 is made of a material compatible with the tooth surface, and its surface is treated to provide good bonding performance and durability, which can be stably fixed on the tooth surface for a long time, preventing falling off or displacement due to patient activity or orthodontic force. The design of the retention accessory takes into account the stability of the appliance fixation and the comfort of the patient, avoiding discomfort that may occur during the treatment process.

[0056] The internal volume of the retention accessory cavity 7 is slightly larger than the external volume of the retention accessory 8, and the design forms a wrapping structure for accurately accommodating and fixing the retention accessory 8. The internal cavity is optimally designed to provide sufficient space for the retention accessory while ensuring its stability in the main structure 1 of the appliance. The wrapping structure is designed to be integrated with the main body of the appliance, so that the retention accessory can move with the appliance as a whole during the treatment process, avoiding loosening or falling off. The edges of the retention accessory cavity 7 are rounded, which not only improves the comfort of the patient during wearing, but also reduces the mucosal irritation caused by oral friction.

[0057] The cooperation design of the retention accessory 8 and the retention accessory cavity 7 not only improves the retention performance of the appliance, but also enhances the adaptability of the appliance in the adjustment of complex occlusal relationship. During the treatment process, the accurate positioning of the retention accessory can ensure the stability of the appliance in the dentition, avoiding the problem of dispersion or transmission efficiency of the treatment force. In addition, the wrapping structure of the retention accessory cavity can effectively resist the impact of external force on the retention accessory, prolonging the service life of the appliance. Through the synergistic effect of the retention accessory and the retention accessory cavity, the present utility model realizes the dual optimization of the fixation and comfort of the appliance, providing more reliable technical support for the treatment of Class III malocclusion.

[0058] The force application device 9 is composed of orthodontic elastic wire, which is designed reasonably and can provide continuous and stable treatment force to realize the gradual adjustment of teeth. One end of the force application device is connected to the target tooth through the traction device 6, and the other end is fixed on the corresponding tooth or dentition structure, which maintains the stable transmission of the treatment force during the force application process through the elastic properties of the orthodontic elastic wire. The force value of the elastic wire can be customized according to the treatment needs of different patients to adapt to the specific requirements of tooth movement and occlusal relationship reconstruction in the treatment of Class III malocclusion.

[0059] The orthodontic elastic wire material is selected from a high-elasticity and high-durability synthetic material, has excellent fatigue resistance, can maintain elastic stability for a long time, and avoids poor treatment effect caused by force value attenuation during treatment. The surface of the elastic wire is treated in a special way to reduce friction with other components or soft tissues in the oral cavity during force application, thereby improving the comfort of the patient during wearing and reducing the degree of wear of the appliance during use, thereby prolonging the service life.

[0060] The installation position and direction of the force application device 9 are accurately designed to adjust the size and direction of the force according to the phased requirements of the treatment of the dentition, and to ensure the gradual achievement of the treatment target. During the treatment, the force value 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 treatment force. Through the cooperation with the traction device 6 and the appliance traction window 5, the force application device can efficiently transmit the treatment force to the target teeth, ensuring the overall coordination of the dentition and the stability of the treatment process.

[0061] Example 1: Laboratory design and production

[0062] 1. Reference Figures 3-4 , reconstruct the upper and lower occlusion and produce the upper and lower occlusion wax. The teeth in the upper and lower anterior regions are required to be non-contact, and the distance between the incisal edges of the teeth in the upper and lower anterior regions is maintained within ±1 to 3 mm.

[0063] 2. According to the occlusion relationship of the upper and lower jaws and the produced upper and lower occlusion wax, design the tooth position for stable occlusal pad bonding, and determine the height of the stable occlusal pad according to the distance relationship of the incisal edges of the teeth in the upper and lower anterior regions, to ensure that the stable occlusal pad can provide accurate occlusal clearance and stability.

[0064] 3. The design height of the elongated bubble is determined by the distance between the clinical crown reference point and the inner wall reference point of the elongated bubble, which is called the design height of the elongated bubble. When designing, it is necessary to ensure that the clinical crown reference point and the inner wall reference point of the elongated bubble are completely matched to ensure the effectiveness of the design. The specific calculation method is divided into the following two cases according to the clinical actual situation:

[0065] · Case 1: No need to lower the upper and lower anterior teeth, only need to elongate the posterior teeth, the calculation formula is:

[0066] (Stable occlusal pad height - invisible aligner thickness - normal overbite of anterior teeth 0.5 to 1 mm ± iatrogenic opening height of upper and lower anterior teeth) = design height of elongated bubble.

[0067] · Case 2: When the upper and lower anterior teeth need to be lowered, the calculation formula is:

[0068] (Stable bite pad height - Invisalign thickness - Upper and lower anterior teeth intrusion amount - 0.5 to 1 mm normal overjet of anterior teeth ± iatrogenic upper and lower anterior teeth open height) = elongation bubble design height.

[0069] According to the above formula, after determining the design height of the elongation bubble, the elongation bubble is made according to the calculation results.

[0070] 4. According to the above requirements, the stable bite pad matching window, the appliance traction window, the retention accessory bubble and the retention accessory of the appliance are designed to ensure that each component has a clear function and is closely matched in the appliance.

[0071] 5. According to the above design content, the accessory bonding template and the invisible aligner are made.

[0072] Note: The accessory bonding template needs to include the bubble design of the stable bite pad, and the invisible aligner does not need to design the bubble of the stable bite pad. The invisible aligner needs to design the stable bite pad matching window, and the accessory bonding template does not need to design the matching window.

[0073] 6. The invisible aligner can increase other design operations such as molar distalization, tooth lip adjustment or expansion according to the actual clinical needs to adapt to different treatment needs.

[0074] 7. All the above designs can be completed by 3D digital technology, which can accurately simulate the movement trajectory of the teeth, simplify the clinical operation design process, and improve the accuracy and efficiency of the appliance production.

[0075] Example 2: Clinical actual operation

[0076] 1. Clean and etch the surface of the teeth that need to be bonded with stable bite pads, traction devices and retention accessories to ensure that the tooth surface is free of contamination, moderately moist to provide the best bonding conditions and ensure the firmness of the appliance components.

[0077] 2. Use the accessory bonding template to accurately bond the stable bite pad, traction device and retention accessory to the designated position of the corresponding tooth. The stable bite pad is usually bonded to the occlusal surface of the posterior tooth to provide the necessary occlusal clearance; the traction device is fixed to the buccal surface of the target tooth for connecting the force application device; the retention accessory is bonded to the buccal and lingual surface of the tooth to improve the stability and comfort of the appliance. The design of the bonding template ensures the accuracy and efficiency of the operation, reducing the complexity of the clinical operation.

[0078] 3. After wearing the invisible aligner, connect one end of the force application device to the traction device on the upper and lower dental surfaces, and fix the other end to the opposite dental arch. The force application device gradually adjusts the movement trajectory and occlusal relationship of the teeth through elastic traction force, while maintaining the overall coordination of the entire appliance system.

[0079] 4. Every two weeks, focus on checking the movement of teeth and whether there are obstacles in the elongation cavity, and confirm whether the force value of the force applying device is in the appropriate range. If necessary, the elastic force value or component position of the force applying device can be adjusted according to the actual treatment situation to ensure the stability and continuity of the treatment effect. Content of the utility model

[0081] The design of the utility model is based on the principle of "three points forming a plane", and the tooth movement and occlusion relationship adjustment are closely combined with the story of "a donkey falling into a well". The "three points" include the stable occlusal pad of the bilateral posterior tooth area and the upper and lower anterior tooth area appliance contact surface, which together form a false plane, temporarily stabilize the occlusion relationship of the upper and lower dental arches, and provide necessary conditions for subsequent occlusion reconstruction. Under the synergistic effect of the traction device and the force applying device, the teeth gradually elongate, similar to the "donkey" shaking off the dirt on its body, gradually filling the elongation cavity. With the progress of the treatment, the false plane gradually transforms into a real plane, the upper arch realizes counterclockwise rotation, and the lower arch and the mandible realize clockwise rotation.

[0082] This rotational adjustment not only rebuilds the stable occlusion relationship of the upper and lower dental arches, but also improves the appearance of the patient's chin through the clockwise rotation of the mandible, achieving the goal of adjusting the SNB angle and correcting class III malocclusion. Through the above principles, the utility model can efficiently complete the treatment of complex occlusion problems, while reducing the uncertainty in the treatment process and significantly improving the stability of the treatment effect and the treatment experience of the patient.

[0083] The specific embodiments described herein are merely illustrative of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.

Claims

1. An aligner for Class III malocclusion, characterized in that, Comprise: Appliance main structure (1), stable bite pad (2), appliance stable bite pad anastomosis window (3), elongation cavity (4), appliance traction window (5), traction device (6), retention accessory cavity (7), retention accessory (8), force device (9); Appliance main structure (1) is made of transparent high molecular material, the overall structure is integrally formed, which is used to connect each part of the appliance and assist in appearance and retention; The stable bite pad (2) is arranged in the posterior region of the upper or lower dentition, which is used to provide the elongation gap of the upper and lower dentition and the stable bite effect; The elongation cavity (4) has a fixed structure height, which is determined by the distance between the inner side wall of the elongation cavity (4) and the clinical crown reference point of the tooth; The appliance traction window (5) is arranged on the buccal side of the tooth corresponding to the elongation cavity (4), which is used to install the traction device (6); The traction device (6) is fixed on the tooth surface by adhesion, and is connected with the opposite tooth by the force device (9); The retention accessory cavity (7) is integrally formed with the appliance main structure (1), and the retention accessory (8) is arranged in the cavity, which is used to enhance the retention of the appliance.

2. The aligner for class III malocclusion according to claim 1, wherein: The stable bite pad (2) is adhered to the occlusal surface of the tooth by the invisible appliance adhesion template, and the occlusal surface shape is consistent with the clinical crown occlusal surface shape; The appliance stable bite pad anastomosis window (3) is designed as a hollow structure, and the buccal-lingual diameter and the mesial-distal diameter are greater than the corresponding size of the stable bite pad (2).

3. The aligner for class III malocclusion of claim 1, wherein: The buccal-lingual diameter and the mesial-distal diameter of the elongation cavity (4) are greater than the external size of the corresponding tooth, so as to accommodate the gradual elongation of the tooth.

4. The aligner for class III malocclusion of claim 1, wherein: The distance between the edge of the appliance traction window (5) and the adhesion bottom plate of the traction device (6) is 0.5-4.5mm.

5. The aligner for class III malocclusion of claim 1, wherein: The retention accessory (8) is located on the buccal / lingual side of the tooth adhered with the stable bite pad (2) and the buccal / lingual side of the mesial tooth designed with the elongation cavity (4); The internal volume of the retention accessory cavity (7) is greater than the external volume of the retention accessory (8), and the internal design forms a wrapping structure for accommodating and fixing the retention accessory (8).

6. The aligner for class III malocclusion of claim 1, wherein: The force device (9) is composed of orthodontic elastic wire, one end of which is connected with the traction device (6), and the other end is fixed on the corresponding tooth position.

7. The aligner for class III malocclusion according to claim 1, wherein, The transparent high molecular material is made of medical grade polycarbonate, polymethyl methacrylate or polyamide.

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