A clear dental aligner and method of teeth alignment

Abstract

The present application relates to a kind of invisible mouthguard and dental orthodontic method, belong to oral medical instrument equipment field.The device mainly includes anterior teeth correction unit, posterior tooth anchorage unit and rigid connection unit;Anterior teeth correction unit contains the anterior teeth prefabricated accessory bonded to the labial side of anterior teeth and combination type mouthguard, and the labial membrane type mouthguard of combination type mouthguard is inserted into the crown side slot of anterior teeth prefabricated accessory and forms rigid torque constraint;Posterior tooth anchorage unit contains personalized printing ring and integrated cheek tube bonded to posterior teeth;Rigid connection unit one end is fixed with combination type mouthguard, and the other end is inserted into cheek tube and forms adjustable locking cooperation.Use method includes obtaining oral cavity three-dimensional data, design correction scheme, bonding assembly, pull rigid connection unit and adjust the force, replace the accessory of different slot angle and adjust torque.The present application realizes the precise torque control of anterior teeth, dynamic adjustable correction force, eliminates the interference of posterior teeth occlusion, and improves the precision and individualized adaptation ability of invisible correction.

Description

Technical Field

[0001] This invention relates to the field of dental medical devices. In particular, it relates to an invisible braces and a method for orthodontic treatment. Background Technology

[0002] In the field of orthodontics, clear aligner technology has been widely used in various orthodontic cases due to its significant advantages such as aesthetics, ease of removal and wearing, minimal foreign body sensation in the mouth, and ease of oral hygiene.

[0003] Currently, the mainstream clear aligners used in clinical applications all adopt an integral shell structure design. The manufacturing process is usually as follows: first, a three-dimensional digital model of the user's teeth is obtained; then, the process of teeth moving gradually is simulated using CAD software to generate a series of digital models of the aligners at different stages; finally, a shell aligner that precisely matches the tooth morphology at each stage is manufactured using a thermoforming process.

[0004] However, existing integrated shell clear aligners have the following technical limitations in actual clinical applications: First, the torque control precision for anterior teeth is insufficient. Traditional shell aligners rely on elastic materials to wrap the labial side of the anterior teeth, providing only flexible constraints and failing to achieve precise control of the labial or lingual torque of the anterior tooth roots. Second, the orthodontic force cannot dynamically adapt to individual differences. The force intensity of the aligner is fixed by the materials and shape used during production, making it difficult to adapt to the biomechanical characteristics of different users. Third, posterior tooth occlusal interference is prominent. The integrated shell design keeps the posterior teeth in a constantly elevated state, disrupting the establishment and adjustment of the natural occlusal relationship during treatment. Fourth, a "roller coaster effect" is prone to occur during extraction orthodontic treatment, where the crown of the anterior teeth retracts rapidly, but the roots cannot move synchronously due to the lack of effective root control structures, affecting the stability of the treatment effect. Summary of the Invention

[0005] The purpose of this invention is to provide an invisible braces and a method for orthodontic treatment, so as to solve one or all of the technical problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: A first aspect of the present invention provides an invisible brace, comprising: Anterior orthodontic unit, posterior anchorage unit, and rigid connection unit; The anterior orthodontic unit includes prefabricated anterior attachments bonded to the labial side of the anterior teeth and a combination brace worn on the anterior teeth. The combination brace includes a labial membrane brace and a lingual shell brace. The labial membrane brace is inserted into the coronal slot of the prefabricated anterior attachment to form a rigid torque constraint. The posterior anchorage unit includes a personalized printed band bonded to the posterior teeth and a buccal tube integrally formed on the buccal side of the printed band. One end of the rigid connection unit is fixedly connected to the combined braces, and the other end is inserted into the buccal tube and forms an adjustable locking fit with the buccal tube.

[0007] According to one embodiment of the present invention, the rigid connecting unit is a rigid toothed wire, and the surface of the rigid toothed wire is provided with a uniformly distributed tooth structure; the inner wall of the cheek tube is provided with internal teeth that are adapted to the tooth structure, and the rigid toothed wire and the cheek tube achieve a pull-out locking through the engagement of the tooth structure and the internal teeth.

[0008] According to one embodiment of the present invention, the personalized printed band for posterior teeth only covers the middle part of the crown and the neck of the posterior teeth, and does not cover the occlusal surface and the gingival margin of the posterior teeth.

[0009] According to one embodiment of the present invention, the coronal groove of the prefabricated anterior tooth attachment is a U-shaped groove or a V-shaped groove, and the gap between the labial membrane-type dental crown and the inner wall of the coronal groove is less than 0.1 mm.

[0010] A second aspect of the present invention provides a method for orthodontic treatment, comprising the following steps: S1: Obtain the user's three-dimensional digital model of the oral cavity and alveolar bone parameters; S2: Design a treatment plan based on the acquired data, including designing the coronal groove angle for the prefabricated anterior attachments; S3: Bond the prefabricated anterior attachments to the labial side of the anterior teeth, bond the personalized printed bands and buccal tubes to the posterior teeth, and then wear the combined braces on the anterior teeth so that the labial membrane braces are inserted into the coronal slots of the prefabricated anterior attachments. S4: Insert the rigid connecting unit into the lumen of the cheek tube from the proximal middle end of the cheek tube to form an initial engagement between the rigid connecting unit and the cheek tube, and then pull the rigid connecting unit backward to the preset position to lock the rigid connecting unit with the cheek tube. S5: According to the orthodontic plan, the engagement position of the rigid connecting unit and the buccal tube is changed by pulling the rigid connecting unit backward or pushing it forward, thereby adjusting the retraction force of the anterior teeth. S6: When it is necessary to change the anterior tooth torque, replace the prefabricated anterior tooth attachments with different coronal slot angles and the corresponding combination aligners. The torque will change by 1°-2° each time.

[0011] According to one embodiment of the present invention, the method for designing the coronal slotting angle of the prefabricated anterior tooth attachment in step S2 is as follows: when the torque angle of the maxillary central incisor is greater than 12°, the slotting angle β is equal to the torque angle α minus 12°; when the torque angle of the maxillary central incisor is less than 7°, the slotting angle β is equal to 7° minus the torque angle α.

[0012] According to one embodiment of the present invention, step S2 further includes selecting the strength of the 3D printing material, wherein the strength of the material is selected based on the obtained alveolar bone parameters.

[0013] According to one embodiment of the present invention, in step S5, the step size of pulling the rigid connecting unit backward is 0.25mm to 0.75mm each time, corresponding to 1 to 3 tooth units of the toothed structure.

[0014] According to one embodiment of the present invention, the adjustment method of pushing the rigid connection unit forward to reduce the adduction force value in step S5 corresponds to the stage in the orthodontic plan where the force value needs to be reduced.

[0015] According to one embodiment of the present invention, the rigid connecting unit is a toothless rigid wire, which applies anterior tooth retraction force through intramaxillary elastic traction to replace the pull-locking method in steps S4 and S5.

[0016] Beneficial effects This invention has at least one of the following technical effects: 1. This invention, through the design of prefabricated anterior teeth with coronal slots and the fitting of labial membrane-type braces into slots, forms a rigid mechanical constraint, effectively restricting the tilting movement of anterior teeth, significantly improving the torque control accuracy of anterior teeth, realizing overall tooth movement, and completely solving the problem of poor torque control in traditional invisible orthodontics.

[0017] 2. This invention achieves adjustable control of orthodontic force through the engagement and locking structure of the rigid toothed wire and the buccal tube. The orthodontist can dynamically adjust the anterior tooth retraction force by pulling or pushing the wire according to the treatment plan, without needing to replace the entire appliance, thus achieving precise control of the orthodontic force.

[0018] 3. The present invention adopts a personalized printed band design for the posterior teeth, which only wraps the middle and neck of the posterior tooth crown, without covering the occlusal surface and gingival margin, ensuring that the posterior teeth can make normal occlusal contact, completely eliminating the padding effect of traditional invisible aligners, and ensuring the natural establishment and stability of the occlusal relationship during the orthodontic process.

[0019] 4. This invention achieves overall retraction of the anterior teeth through the adjustable force structure of the rigid toothed wire and buccal tube, combined with the torque constraint of the prefabricated attachments and membrane, thus eliminating the "roller coaster effect" in tooth extraction orthodontic treatment from the root and improving the stability of the treatment effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the overall structure of invisible braces Figure 1 ; Figure 2 A schematic diagram of the overall structure of invisible braces Figure 2 ; Figure 3 A schematic diagram showing the structure of invisible braces worn on the front teeth; Figure 4 This is a schematic diagram showing the fit between the buccal tube and the rigid connection unit in an invisible braces. Figure 5 This is a flowchart of a teeth straightening procedure.

[0022] Explanation of reference numerals in the attached figures: 1. Anterior Orthodontic Unit; 11. Anterior Prefabricated Attachments; 12. Modular Braces; 121. Labial Membrane Braces; 122. Lingual Shell Braces; 2. Posterior Anchorage Unit; 21. Printed Bands; 22. Buccal Tubes; 3. Rigid Connection Units. Detailed Implementation

[0023] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and to exemplify the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of the present invention.

[0024] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0025] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0026] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., without specifically indicating order or sequence, and should not be considered restrictive. Similar terms are used throughout the description to represent similar elements.

[0027] It will be apparent to those skilled in the art that the present invention can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

[0028] In the following embodiments, there may be descriptions such as "this device". Those skilled in the art should understand that "this device" refers to an invisible braces provided by the present invention, including an anterior orthodontic unit 1, a posterior anchorage unit 2 and a rigid connection unit 3.

[0029] Anterior Orthodontic Unit 1 is designed to fit the user's maxillary or mandibular anterior teeth, including the central incisors, lateral incisors, and canines. Its core function is to achieve precise torque control and controllable directional retraction of the anterior teeth. Anterior Orthodontic Unit 1 consists of prefabricated anterior attachments 11 and modular braces 12. Modular braces 12 further include labial membrane braces 121 and lingual shell braces 122.

[0030] Anterior prefabricated attachment 11: Made using personalized 3D printing technology, the material is either a biocompatible dental resin or zirconia-reinforced ceramic with moderate strength. The structure of the anterior prefabricated attachment 11 precisely conforms to the surface of the anterior teeth and is used to cooperate with the modular brace 12 to achieve rigid constraint control of the anterior tooth torque.

[0031] The key design feature of the prefabricated anterior tooth attachment 11 is that a through-hole coronal slot is provided on the side of the attachment facing the crown. The cross-section of this slot is U-shaped or V-shaped, and the slot direction is at a predetermined angle to the long axis of the anterior tooth. The coronal slot is used to accommodate the insertion of the labial membrane-type dental crown 121, forming a mechanical lock.

[0032] Prefabricated anterior attachment 11 is firmly bonded to the labial surface of the anterior teeth using dental adhesive. Before bonding, the anterior tooth surfaces undergo routine acid etching and moisture isolation treatment to ensure bonding strength and prevent attachment detachment during orthodontic treatment. One prefabricated anterior attachment 11 is bonded to each anterior tooth. The attachment size is adapted to the dimensions of the anterior tooth surface and does not protrude excessively from the crown surface to minimize irritation to the oral mucosa and aesthetic impact.

[0033] The modular braces 12 are made by molding the labial membrane braces 121 and the lingual shell braces 122 into one piece. The whole structure adopts the combination structure of "labial membrane plus lingual wrapping". It is made by 3D printing technology to ensure structural precision and fit.

[0034] The labial membrane-type aligner 121 is a membrane structure with a thickness of 0.3mm to 0.5mm. Its shape precisely matches the labial morphology of the anterior teeth and the coronal groove of the prefabricated anterior attachment 11. The labial membrane-type aligner 121 can be directly inserted into the coronal groove of the prefabricated anterior attachment 11. After insertion, it fits tightly against the inner wall of the groove with a clearance of less than 0.1mm to ensure accurate torque expression. Through the rigid support of the membrane, the tilting movement of the anterior teeth is restricted, achieving precise control of the labial or lingual torque of the anterior tooth roots. In the early stage of orthodontic treatment, the labial membrane-type aligner 121 can be printed using relatively soft TPU material for gradual and gentle alignment. In the leveling and gap closing stages, the labial membrane-type aligner 121 can be precisely manufactured using PEEK material through 3D printing to achieve torque control and efficient closure of extraction gaps.

[0035] The lingual shell-shaped brace 122 is a shell-shaped structure that precisely conforms to the lingual surface of the anterior teeth. It is manufactured using 3D printing with highly elastic TPU material. The lingual shell-shaped brace 122 completely covers the lingual surface of the anterior teeth, enhancing the retention of the clear aligner, stabilizing the position of the anterior teeth, assisting the labial membrane brace 121 in achieving torque control, and reducing the foreign body sensation on the lingual side of the anterior teeth, thus improving wearing comfort.

[0036] The posterior anchorage unit 2 is designed to fit the user's maxillary or mandibular posterior teeth, including the first premolar, second premolar, first molar, and second molar. Its core function is to provide stable anchorage for anterior tooth retraction, while simultaneously enabling adjustable control of the retraction force and direction. The posterior anchorage unit 2 consists of a personalized posterior tooth printed band 21 and a buccal tube 22.

[0037] Personalized 3D Printed Posterior Tooth Band 21: Manufactured using personalized 3D printing technology, the band is made from a biocompatible and high-strength dental resin. The structure of the personalized 3D printed posterior tooth band 21 precisely conforms to the morphology of the posterior tooth, forming a ring that wraps around the crown. The key design feature of the personalized 3D printed posterior tooth band 21 is that the band only wraps around the middle and neck of the crown, without covering the occlusal surface or gingival margin. This ensures normal contact between the occlusal surfaces of the posterior teeth, eliminating the padding effect of traditional shell braces and not affecting the adjustment, establishment, and stability of the occlusal relationship during orthodontic treatment. The inner wall of the band has micro-anti-slip textures to enhance friction between the band and the tooth surface. It can also be bonded to the tooth surface using dental adhesive, ensuring the stability of the posterior tooth anchorage and preventing band displacement during treatment.

[0038] Buccal tube 22: Utilizing 3D printing technology, it is integrally molded with the personalized posterior tooth band 21, using the same material. The buccal tube 22 is positioned on the buccal surface of the band, precisely corresponding to the rigid toothed wire extending from the anterior teeth. The structure of the buccal tube 22 is similar to that of the buccal tube 22 in traditional fixed orthodontic treatment; it is a hollow tubular structure with a circular or square cross-section. The diameter of the tube precisely matches the rigid toothed wire, with a clearance of 0.1mm to 0.2mm to ensure smooth insertion of the wire into the tube.

[0039] The key design feature of the buccal tube 22 is that its inner wall has internal teeth that fit the toothed structure of the rigid toothed wire, allowing them to mesh with each other. When the rigid toothed wire is inserted into the buccal tube 22, pulling the wire backward engages and locks the wire's toothed structure with the internal teeth of the buccal tube 22. By adjusting the pulling distance, the magnitude of the anterior tooth retraction force can be controlled. Simultaneously, the buccal tube 22 can be set to different tilt angles according to orthodontic needs, thereby adjusting the direction of force on the rigid toothed wire and achieving precise control of the anterior tooth retraction direction.

[0040] One end of the rigid connection unit 3 is fixedly connected to the combined brace 12, and the other end is inserted into the buccal tube 22 to form an adjustable locking fit with the buccal tube 22.

[0041] In a preferred embodiment, the rigid connecting unit 3 is a rigid toothed wire. The rigid toothed wire is integrally formed with the combined brace 12 and is manufactured using 3D printing technology. One end of the wire is fixedly connected to the distal end of the labial membrane brace 121, and the other end extends distally until it reaches the buccal tube 22 of the corresponding posterior tooth. The overall length is determined by the distance between the anterior and posterior teeth.

[0042] The key design feature of rigid toothed wires lies in the evenly distributed toothed structure on their surface. The tooth spacing ranges from 0.5mm to 1.0mm, the tooth height from 0.3mm to 0.5mm, and the tooth shape is serrated. This structure engages with the buccal canal 22 of the posterior teeth to achieve clasp-lock after retraction, thereby adjusting the force required for anterior tooth retraction. The wire itself is rigid, with no significant elastic deformation, ensuring stable and controllable applied orthodontic force and avoiding the force attenuation issues associated with elastic materials.

[0043] In another embodiment, the rigid connecting unit 3 can also be a toothless rigid wire, in which case the anterior teeth can be retracted by intramaxillary elastic traction to achieve the closure of the extraction gap.

[0044] This embodiment provides an orthodontic method using the above-mentioned invisible braces, specifically including the following steps: S1: Data Acquisition Obtain a three-dimensional digital model of the user's oral cavity and alveolar bone parameters. Methods for obtaining the three-dimensional digital model of the oral cavity include, but are not limited to: directly acquiring a three-dimensional digital model of the user's intraoral dentition using an intraoral scanner, or scanning the user's dental model using a plaster model scanner. Methods for obtaining alveolar bone parameters include, but are not limited to: scanning with CBCT equipment to assess parameters such as alveolar bone thickness, bone density, periodontal ligament status, and jawbone CT values. Simultaneously, record parameters such as the user's dentition status, occlusal relationship, and anterior tooth torque angle.

[0045] S2: Treatment Plan Design and Production The treatment plan is designed based on the acquired data. The design of the treatment plan includes: determining the structural parameters of the anterior orthodontic unit 1, the posterior anchorage unit 2, and the rigid connection unit 3.

[0046] Specifically, the coronal slotting angle of the prefabricated anterior tooth attachment 11 was designed. The slotting angle was designed as follows: when the torque angle of the maxillary central incisor is greater than 12°, the slotting angle β is equal to the torque angle α minus 12°; when the torque angle of the maxillary central incisor is less than 7°, the slotting angle β is equal to 7° minus the torque angle α. Through sequential design, the torque was changed by 1°-2° each time, gradually adjusting the anterior tooth torque to the target position.

[0047] Simultaneously, the strength of the 3D printing material was selected based on the acquired alveolar bone parameters. The material strength selection method was as follows: for cases where the periodontal ligament gap widening was greater than 0.3 mm, alveolar bone height was reduced, the labial alveolar bone thickness of the anterior teeth was less than or equal to 1.5 mm, or the jawbone CT value was less than or equal to 250 HU, TPU material with good elasticity was preferentially selected for orthodontic treatment to achieve initial adaptation of the orthodontic force. During the leveling and gap closing stages, PEEK material was used to fabricate the labial membrane-type brace 121 and rigid connecting unit 3 to achieve high strength and control precision.

[0048] After the design is completed, the anterior tooth prefabricated attachment 11, the combined dental crown 12, the posterior tooth personalized printed band 21 and cheek tube 22, and the rigid connection unit 3 are manufactured using 3D printing technology.

[0049] S3: Clinical Adhesion and Fitting Bond the prefabricated anterior tooth attachment 11 to the labial side of the anterior teeth, and bond the personalized printed band 21 and buccal tube 22 to the posterior teeth. During bonding, the tooth surface should be routinely prepared and a dental adhesive should be used to ensure a firm bond. After bonding, allow the tooth to stand for a preset time, typically 5 to 10 minutes, to ensure that the attachments and bands do not shift.

[0050] The combined dental aligner 12 is then placed on the anterior teeth, allowing the labial membrane aligner 121 to be inserted into the coronal slot of the prefabricated attachment 11. The labial membrane aligner 121 fits tightly against the inner wall of the coronal slot, with a clearance of less than 0.1 mm, forming a rigid torque constraint. The lingual shell-shaped dental aligner 122 wraps around the lingual side of the anterior teeth to enhance retention.

[0051] S4: Initial Force Setting The rigid connecting unit 3 is inserted into the lumen of the buccal tube 22 from the proximal end of the buccal tube 22, so that the rigid connecting unit 3 and the buccal tube 22 form an initial engagement. For the rigid toothed wire, the toothed structure of the wire initially engages with the internal teeth of the buccal tube 22. At this time, the anterior teeth are in the initial position, with no or only a very small retraction force applied.

[0052] Then, pull the rigid connecting unit 3 backward to the preset position to lock the rigid connecting unit 3 with the buccal tube 22. For the rigid toothed wire, during the pulling process, the toothed structure of the wire gradually engages with the inner teeth of the buccal tube 22. When pulled to the preset position, the toothed structure tightly engages with the inner teeth of the buccal tube 22. At this time, the rigid connecting unit 3 applies a continuous and stable initial retraction force to the anterior teeth.

[0053] S5: Dynamic force adjustment According to the orthodontic plan, the engagement position of the rigid connecting unit 3 and the buccal tube 22 is changed by pulling the rigid connecting unit 3 backward or pushing it forward, thereby adjusting the anterior tooth retraction force.

[0054] When an increase in the retracting force is required, continue pulling the rigid connecting unit 3 backward, with each pull increment ranging from 0.25mm to 0.75mm, corresponding to 1 to 3 tooth units of the toothed structure. After pulling, the toothed structure of the hard wire re-engages and locks with the inner teeth of the cheek tube 22 at a more distant position, and the retracting force increases accordingly.

[0055] When a reduction in the adduction force is required, the rigid connecting unit 3 is pushed forward, causing the toothed structure of the hard wire to engage and lock with the internal teeth of the buccal tube 22 at a closer position, thus reducing the adduction force accordingly. The forward pushing adjustment method corresponds to the stage in the orthodontic plan where a reduction in force is required.

[0056] S6: Dynamic Torque Adjustment When it is necessary to change the anterior tooth torque, replace the prefabricated anterior tooth attachment 11 with one having a different coronal slot angle and the corresponding combination crown 12. Change the torque by 1°-2° each time, gradually adjusting the anterior tooth torque to the target position.

[0057] Specifically, if it is necessary to increase the torque value of the anterior teeth, the prefabricated anterior tooth attachment 11 with a larger slot angle and the corresponding combined dental crown 12 should be replaced; if it is necessary to decrease the torque value of the anterior teeth, the prefabricated anterior tooth attachment 11 with a smaller slot angle and the corresponding combined dental crown 12 should be replaced. After replacement, the labial membrane dental crown 121 and the coronal slot of the new attachment will fit together to form a new torque constraint direction.

[0058] In another embodiment, the rigid connecting unit 3 is a toothless rigid wire, which applies anterior tooth retraction force through intramaxillary elastic traction, replacing the pull-locking method in steps S4 and S5 above. Specifically, after inserting the toothless rigid wire into the buccal tube 22, instead of generating retraction force through pull-locking, an elastic chain or rubber band is connected between the rigid wire and the posterior buccal tube 22, and anterior tooth retraction force is applied through elastic traction. This alternative is suitable for orthodontic scenarios that require lower force values ​​or more flexible force adjustment.

[0059] In this invention, the materials of each unit can be individually selected according to the treatment stage and the user's biomechanical parameters.

[0060] For the prefabricated anterior tooth attachment 11 and the personalized printed band 21 for posterior teeth, dental-grade resin materials or zirconia-reinforced ceramics are preferred. These materials have advantages such as good biocompatibility, moderate strength, and 3D printing capability.

[0061] For the labial membrane brace 121 of the combination brace 12, different materials can be selected according to the orthodontic stage: in the alignment stage, a softer TPU material is selected to achieve gradual and gentle alignment; in the leveling stage and the gap closing stage, PEEK material is selected. This material has high strength and rigidity, which can achieve precise torque control and efficient closure of extraction gaps.

[0062] For the lingual shell-shaped brace 122 of the combined brace 12, TPU material with good elasticity is preferred to improve wearing comfort and retention.

[0063] For rigid toothed wires, PEEK or stainless steel materials are preferred to ensure that the wires have sufficient rigidity and no obvious elastic deformation, thus ensuring that the applied orthodontic force is stable and controllable.

[0064] During the initial consultation, a three-dimensional digital model of the entire dentition is obtained using an intraoral scanner, and alveolar bone parameters are acquired using CBCT. Based on the acquired data, the dentist develops a treatment plan, determining target parameters such as the distance the anterior teeth need to be retracted and the torque angle that needs to be adjusted.

[0065] According to the treatment plan, the entire set of components is manufactured using 3D printing. During the first clinical procedure, the dentist bonds the prefabricated anterior tooth attachment 11 to the labial side of the anterior teeth, and bonds the personalized printed band 21 and buccal tube 22 to the posterior teeth. Then, the modular aligner 12 is placed on the anterior teeth, allowing the labial membrane aligner 121 to be inserted into the coronal slot of the attachment. Finally, the rigid toothed wire is inserted from the mesial end of the buccal tube 22 and pulled back to the initial preset position, completing the initial fitting.

[0066] During the wearing process, the corrective force is continuously applied to the front teeth through the locking effect of the rigid toothed wires. At each follow-up visit, the doctor will decide, based on the progress of the orthodontic plan, whether it is necessary to further pull the wires to increase the retraction force, or whether it is necessary to change the attachments with different groove angles and the combination braces 12 to adjust the torque.

[0067] Once treatment is complete, the dentist removes all attachments and bands and polishes the tooth surfaces. Users can wear a regular clear retainer to maintain the treatment results.

[0068] It should be understood that the above-described embodiments or examples of the present invention can be combined with each other and have corresponding technical effects.

[0069] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An invisible brace, characterized in that, include: Anterior orthodontic unit (1), posterior anchorage unit (2) and rigid connection unit (3); The anterior orthodontic unit (1) includes an anterior prefabricated attachment (11) bonded to the labial side of the anterior teeth and a combined brace (12) worn on the anterior teeth. The combined brace (12) includes a labial membrane brace (121) and a lingual shell brace (122). The labial membrane brace (121) is inserted into the coronal slot of the anterior prefabricated attachment (11) to form a rigid torque constraint. The posterior anchorage unit (2) includes a personalized printed band (21) bonded to the posterior tooth and a buccal tube (22) integrally formed on the buccal side of the printed band (21). One end of the rigid connection unit (3) is fixedly connected to the combined brace (12), and the other end is inserted into the cheek tube (22) and forms an adjustable locking fit with the cheek tube (22); The rigid connecting unit (3) is a rigid toothed wire, and the surface of the rigid toothed wire is provided with a uniformly distributed tooth structure; the inner wall of the cheek tube (22) is provided with internal teeth that are adapted to the tooth structure, and the rigid toothed wire and the cheek tube (22) achieve pull-out locking through the meshing of the tooth structure and the internal teeth.

2. The invisible braces according to claim 1, characterized in that, The personalized printed band (21) for posterior teeth only covers the middle and neck of the crown of the posterior teeth, and does not cover the occlusal surface and gingival margin of the posterior teeth.

3. The invisible braces according to claim 1, characterized in that, The coronal slot of the prefabricated anterior tooth attachment (11) is a U-shaped slot or a V-shaped slot, and the gap between the labial membrane-type dental crown (121) and the inner wall of the coronal slot is less than 0.1 mm.

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