Orthodontic component for lingual and invisible combined orthodontic treatment and preparation method of orthodontic component

Abstract

The invention discloses a lingual and invisible combined orthodontic correction assembly and a preparation method thereof. The lingual and invisible combined orthodontic correction assembly comprises a lingual bracket and an invisible orthodontic appliance sleeving the lingual bracket, the lingual bracket is composed of a plurality of bracket bodies and memory alloy round wires sequentially connected to the bracket bodies in a penetrating manner, and a plurality of accommodating cavities for tightly embedding the corresponding bracket bodies are formed in the lingual inner wall of the invisible appliance; the bracket body comprises a bracket base and a bracket main body, the bracket base is abutted against the lingual side of a dental face, the bracket main body is connected to the bracket base, an upper working wing and a lower working wing which are used for locking the relative positions of the lingual bracket and the invisible appliance are formed on the bracket main body, and a groove for penetrating a memory alloy round wire is formed in the middle of the bracket main body; compared with the prior art, through the combination of the lingual bracket and the invisible appliance, the invisible appliance with different treatment degrees can be sleeved outside the same lingual bracket, the overall operation is convenient, and the replacement number of the invisible appliance is obviously reduced under the combined action of the lingual bracket and the invisible appliance.

Description

Technical Field

[0001] This invention relates to the field of orthodontic treatment technology, specifically to a lingual and invisible combined orthodontic treatment component and its preparation method. Background Technology

[0002] With the improvement of living standards and the enhancement of aesthetic concepts, patients' requirements for orthodontic treatment are no longer limited to the straightness of teeth and the restoration of function, but they pay more and more attention to the aesthetic effect of the treatment process and results. Among them, clear aligner technology and personalized lingual orthodontic technology, as two mainstream aesthetic orthodontic solutions, have been rapidly developed and applied.

[0003] The existing clear aligner technology uses aligners made of polymer membranes, which are transparent and removable. The aligners apply corrective force to the teeth by gradually moving them through a series of aligners, relying on the elastic deformation of the membranes. However, this technology also has inherent limitations: the control over the teeth, especially the control over fine movements such as root movement and torque control, is relatively weak, which can easily lead to tilting rather than overall tooth movement; the efficacy is highly dependent on the patient's good cooperation and continuous wearing, and complex cases often require additional devices for assistance, resulting in a high degree of complexity and uncertainty in the treatment.

[0004] Existing personalized lingual orthodontic technology precisely bonds brackets to the lingual surface of the teeth, achieving complete invisibility on the labial side. This technology can provide greater orthodontic force and precise three-dimensional control, resulting in high treatment efficiency. However, because the brackets are located on the lingual side, they can easily affect tongue movement, pronunciation, and oral hygiene maintenance, leading to poor patient comfort in the initial stages. In addition, traditional lingual brackets have a complex structure and protruding shape, making them unsuitable for use in conjunction with other orthodontic appliances.

[0005] Chinese patent CN219940830U discloses a lingual orthodontic attachment and an invisible orthodontic system. The lingual orthodontic attachment has a cavity inside, and the opening of the cavity is located on the gingival side of the lingual orthodontic attachment. The cavity forms an integral undercut groove and a insertion cavity. The undercut groove and the insertion cavity are integrally connected. The opening of the insertion cavity is suitable for the end of the connector to enter. The undercut groove is located on the lip side of the insertion cavity. The undercut groove has an undercut structure for restricting the connector from dislodging. The end of the connector is engaged in the undercut groove.

[0006] The aforementioned lingual orthodontic attachments and connectors are independently designed. This structure is merely a simple auxiliary addition. During use, due to the relatively large height of traditional personalized lingual brackets, if worn simultaneously with clear aligners, the clear aligners may not be fully positioned, resulting in significant local stress. This can severely affect the expression of corrective force and even lead to aligner tearing. Furthermore, the two systems are designed independently and lack synergistic optimization. This not only fails to reduce overall costs but may also increase treatment complexity and expenses due to the increased number of treatment steps and attachments. Summary of the Invention

[0007] The present invention aims to overcome the defects in the prior art and provide a lingual and invisible combined orthodontic treatment component with good compatibility, controllable cost, and good orthodontic effect, as well as its preparation method.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a lingual and invisible combined orthodontic treatment component, comprising a lingual bracket and an invisible aligner fitted over the lingual bracket; the lingual bracket is composed of several low-profile bracket bodies and shape memory alloy wires sequentially threaded through each low-profile bracket body, and the inner wall of the lingual side of the invisible aligner forms several receiving cavities for tightly fitting the corresponding low-profile bracket body; the low-profile bracket body includes a bracket base that fits against the lingual side of the tooth surface and a bracket body connected to the bracket base, the bracket body having an upper working wing and a lower working wing for locking the relative position of the lingual bracket and the invisible aligner, and a groove for threading the shape memory alloy wires being formed in the middle of the bracket body.

[0009] In a preferred embodiment of the present invention, the front end of the bracket body is connected to the bracket base, the upper working wing and the lower working wing are formed at the rear end of the bracket body, and the surfaces of the bracket body, the upper working wing and the lower working wing are flush.

[0010] As a preferred embodiment of the present invention, the upper working wing and the lower working wing are arranged along the sleeve direction of the invisible orthodontic appliance, with the upper working wing extending upward along the top of the bracket body and the upper working wing extending downward along the bottom of the bracket body.

[0011] As a preferred embodiment of the present invention, both the upper working wing and the lower working wing are arc-shaped structures that bend toward the base of the bracket, and two grooves with corresponding shape memory alloy wires are formed in the middle of the bracket body.

[0012] A method for fabricating a lingual and invisible combined orthodontic component, based on the lingual and invisible combined orthodontic component, includes the following steps:

[0013] Step A: Obtain a three-dimensional digital model of the patient's dentition through intraoral scanning, and establish a digital virtual articulator that includes the teeth, gums, and occlusal relationship;

[0014] Step B: Perform virtual tooth alignment on the digital model to determine the final target tooth position, plan the tooth movement path, and clarify the required gaps and overall treatment plan;

[0015] Step C: Design the tongue-side bracket, including the bracket base shape design and the bracket body design. The minimum safe height of the bracket base is designed, and the corresponding upper and lower molds are designed according to the bracket base shape.

[0016] Step D: Several upper mold bases designed according to the back shape of the bracket base are set on the upper mold at the same time, and bracket fixing holes corresponding to the bracket body are opened on the upper mold base. The lower mold base is designed according to the working surface of the bracket base shape. The position of the lower mold base corresponds to the position of the upper mold base. Both the upper mold and the lower mold are made of high-strength resin material by 3D printing.

[0017] Step E: Select a metal slotted mesh plate blank that can simultaneously meet the synchronous stamping of multiple upper die holders, and pre-weld the slotted body corresponding to each upper die holder and lower die holder onto the metal slotted mesh plate blank;

[0018] Step F: By placing the metal slotted wire mesh blank on the lower die, the upper die is pressed down to stamp the metal slotted wire mesh blank, forming the required low-profile slotted body;

[0019] Step G: Design the clear aligner. Based on the overall treatment plan in Step B, design a series of three-dimensional models of the clear aligner that move teeth step by step, and set several accommodating cavities on the inner surface of the clear aligner corresponding to the lingual brackets.

[0020] As a preferred embodiment of the present invention, in step C, the bracket base morphology design is based on the final position of each tooth after virtual tooth arrangement, extracting the three-dimensional morphological data of the lingual surface of each tooth, and designing a bracket base surface that perfectly matches it.

[0021] In a preferred embodiment of the present invention, in step C, the maximum equivalent stress that the bracket base can withstand is satisfied as follows: , The yield strength of the material used for the bracket base, n is the safety factor, and the maximum equivalent stress of the designed bracket base is determined through finite element analysis. Calculations are performed to optimize the shape and height of the bracket base until... .

[0022] In a preferred embodiment of the present invention, step C involves calculating the diameter of the groove in the bracket body, wherein the minimum diameter of the groove is... ,in The minimum diameter required for the trench. The diameter of the shape memory alloy wire. The minimum critical embedding depth to prevent the archwire from coming loose.

[0023] As a preferred embodiment of the present invention, in the design of the upper mold base of the upper mold and the lower mold base of the lower mold in step D, the data of the designed tray base is used to generate a solid model through Boolean operation, and the digital design of the upper mold base and the lower mold base is generated according to the relative preset position of the tray body and the tray base, combined with the back side and working surface of the tray base of the solid model.

[0024] As a preferred embodiment of the present invention, in step D, each upper mold base on the upper mold is independently designed according to the different tray bases required in reality, and similarly, each lower mold base on the lower mold is independently designed according to the different tray bases required in reality.

[0025] In the initial stage of treatment, personalized low-profile lingual brackets are bonded to key tooth positions and fitted with highly elastic nickel-titanium archwires (0.018-inch diameter dual-arch segment nickel-titanium shape memory alloy round wires) to fully utilize the high efficiency of the lingual orthodontic system in rapid tooth alignment and initial leveling.

[0026] Once the crowding of teeth is relieved and the dental arch shape is basically coordinated, the treatment enters the second stage: while retaining the lingual brackets, a clear aligner designed specifically for this stage is worn. This clear aligner is designed and generated step by step using computer-aided digital technology. During the design process, a recessed cavity with an undercut shape is specially constructed at the location on the inner wall of the lingual side of the clear aligner corresponding to the low-profile lingual bracket. This cavity can tightly wrap around and mechanically lock onto the contour surface of the lingual bracket, thereby enhancing the retention stability of the clear aligner and the efficiency of the transmission of orthodontic force.

[0027] During orthodontic treatment, clear aligners not only apply continuous retractive force to close extraction gaps, but also, through their specially designed lingual aligners that interlock with the bonded lingual brackets, achieve precise three-dimensional control of tooth movement during anterior retraction. This effectively prevents adverse side effects such as tilting and root loss of control, ensuring overall tooth movement. Throughout the treatment, the clear aligner sequence can be adjusted or replaced as needed based on the actual tooth movement to ensure the achievement of the final orthodontic goal.

[0028] Compared with existing technologies, the combination of lingual brackets and clear aligners allows for the attachment of clear aligners of different treatment levels to the same lingual bracket, making the overall operation convenient. The combined effect of lingual brackets and clear aligners significantly reduces the number of clear aligner replacements, lowering the risk of treatment failure due to excessive treatment steps. At the same time, the precise root control provided by the lingual aligner stage effectively reduces the possibility of tooth tilting during retraction, thereby reducing the risk of restarting the treatment process.

[0029] The prepared lingual brackets have a base morphology that closely matches the lingual anatomical structure of the teeth, with a large bonding area and good morphological adaptability. This can significantly improve the bonding strength and mechanical retention between the bracket and the tooth surface, thereby effectively reducing the risk of bracket detachment during treatment and improving the overall stability and reliability of the orthodontic system.

[0030] By employing a stamping process that combines a 3D-printed, one-time-use high-strength resin mold with a reusable metal stamped retaining guide, the manufacturing cost of personalized tongue-side brackets has been significantly reduced. This process simplifies the production flow, improves processing efficiency, and is particularly suitable for small- to medium-batch customized production, demonstrating excellent economic viability and widespread application value. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the cavity structure;

[0033] Figure 3 This is a diagram showing the usage status of the tongue-side bracket;

[0034] Figure 4 This is a structural diagram of the upper mold;

[0035] Figure 5 This is a structural schematic diagram of the metal slotted mesh plate blank;

[0036] Figure 6 This is a structural diagram of the lower mold;

[0037] Figure 7 This is a schematic diagram of the stamping device;

[0038] Reference numerals: 1. Invisible aligner; 11. Receiving cavity; 2. Tongue-side bracket; 21. Low-profile bracket body; 22. Bracket base; 23. Bracket main body; 24. Upper working wing; 25. Lower working wing; 26. Groove; 3. Shape memory alloy round wire; 4. Upper mold; 41. Upper mold base; 42. Bracket retention hole; 5. Metal bracket mesh blank; 6. Lower mold; 61. Detailed Implementation

[0039] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] like Figures 1-7 As shown, a lingual and invisible combined orthodontic treatment component includes a lingual bracket 2 and an invisible aligner 1 fitted over the lingual bracket 2. The lingual bracket 2 is composed of several low-profile bracket bodies 21 and shape memory alloy round wires 3 sequentially threaded through each low-profile bracket body 21. The inner wall of the invisible aligner 1 on the lingual side forms several receiving cavities 11 for tightly fitting the corresponding low-profile bracket bodies 21. The low-profile bracket body 21 includes a bracket base 22 that fits against the lingual surface of the tooth and a bracket body 23 connected to the bracket base 22. The bracket body 23 has an upper working wing 24 and a lower working wing 25 for locking the relative positions of the lingual bracket 2 and the invisible aligner 1. A groove 26 for threading the shape memory alloy round wires 3 is formed in the middle of the bracket body 23.

[0041] The lingual bracket 2 is fixed to the lingual surface of the teeth by adhesive. The height of the lingual bracket 2 is lower than that of the traditional lingual bracket. The invisible aligner 1 is used to be worn sequentially on the upper and lower dentition and forms a matching and tight spatial fit with the receiving cavity 11 of the invisible aligner 1.

[0042] The receiving cavity 11 is a bulge structure formed on the clear aligner 1, and the number and size of the receiving cavities 11 are set according to the number of low-profile bracket bodies 21. The clear aligner 1 is made of memory material. During use, the clear aligner 1 at the receiving cavity 11 retracts and presses against the bracket body 23 under the memory effect, realizing the covering and pressing of the bracket body 23, and realizing the interlocking between the clear aligner 1 and the lingual bracket 2.

[0043] The front end of the bracket body 23 is connected to the bracket base 22. The upper working wing 24 and the lower working wing 25 are formed at the rear end of the bracket body 23. The surfaces of the bracket body 23, the upper working wing 24 and the lower working wing 25 are flush. The shape of the bracket base 22 is designed based on the lingual anatomical shape of the target tooth using Geomagic software digital reverse engineering technology, which increases the bonding area and improves the bonding retention and clinical reliability of the bracket base 22.

[0044] The bracket body 23 is fixed to the bracket base 22 by welding. The upper working wing 24 and the lower working wing 25 are used to increase the contact area with the clear aligner 1, thereby increasing the interlocking strength between the clear aligner 1 and the lingual bracket 2.

[0045] The upper working wing 24 and the lower working wing 25 are arranged along the sleeve direction of the invisible orthodontic appliance 1. The upper working wing 24 extends upward along the top of the bracket body 23 and downward along the bottom of the bracket body 23. Both the upper working wing 24 and the lower working wing 25 are arc-shaped structures that bend towards the bracket base 22. Two grooves 26 corresponding to the shape memory alloy round wires 3 are formed in the middle of the bracket body 23.

[0046] Under the action of the upper working wing 24 and the lower working wing 25 of the curved structure, the contact area between them and the invisible aligner 1 is increased. At the same time, the ends of the upper working wing 24 and the lower working wing 25 of the curved structure are limited and locked under the action of covering the invisible aligner 1, thereby improving the interlocking strength.

[0047] A method for fabricating a lingual and invisible combined orthodontic component, based on the lingual and invisible combined orthodontic component, includes the following steps:

[0048] Step A: Obtain a three-dimensional digital model of the patient's dentition through intraoral scanning, and establish a digital virtual articulator that includes the teeth, gums, and occlusal relationship.

[0049] Step B: Perform virtual tooth alignment on the digital model to determine the final target tooth position, plan the tooth movement path, and clarify the required gaps and overall treatment plan.

[0050] Step C: Design the tongue-side bracket 2, including the shape design of the bracket base 22 and the design of the bracket body 23. The minimum safe height of the bracket base 22 is designed, and the corresponding upper mold 4 and lower mold 6 are designed according to the shape of the bracket base 22.

[0051] In step C, the bracket base 22 morphology design is based on the final position of each tooth after virtual tooth arrangement. The three-dimensional morphological data of the lingual surface of each tooth is extracted, and the bracket base 22 surface that perfectly matches it is designed using Geomagic software.

[0052] In step C, the maximum equivalent stress that the bracket base 22 can withstand is satisfied as follows: , The yield strength of the material used for the bracket base 22 is given by n, where n is the safety factor. The maximum equivalent stress of the designed bracket base 22 is determined through finite element analysis. Calculations were performed to optimize the shape and height of the bracket base 22 until... .

[0053] To ensure that the low-profile design does not undergo plastic deformation or failure under corrective forces, the strength of the low-profile bracket body (especially the bracket wall area) must be verified. Its maximum equivalent stress (Von Mises Stress) should meet the following requirements: Through iterative finite element analysis, the optimized groove wall thickness was determined under a 2.0 N corrective force. Maximum equivalent stress of low profile bracket body .

[0054] check: Therefore, the low profile design meets the strength requirements and has a sufficient safety margin.

[0055] Application Notes: This formula demonstrates that through iterative FEA calculations, the height and shape of the low-profile support body can be continuously optimized until its working stress is reached. Below the allowable stress of the material This is the core mechanical basis for determining the minimum safe height of the bracket.

[0056] Step C involves calculating the diameter of the groove 26 in the bracket body 23. The minimum diameter of the groove 26 is... ,in The minimum diameter required for groove 26, The diameter of the shape memory alloy round wire is 3. The minimum critical embedding depth to prevent the archwire from coming loose.

[0057] In a preferred embodiment, the cross-sectional area of ​​two φ0.018-inch nickel-titanium round wires is larger than that of a single 0.018*0.025 square wire on the conventional tongue side, thus adapting to φ0.018-inch (diameter) wires. = 0.457 mm) nickel-titanium round wire, and based on engineering experience, Substituting into the formula, we get: Therefore, the diameter of the circular groove described in this invention must be greater than 0.477 mm. The selection of two φ0.018-inch nickel-titanium round wires achieves stronger control and a lower overall profile. Considering manufacturing tolerances, friction control, and clinical reliability, their diameter is preferably designed to be 0.50 mm. This dimension ensures the secure retention of the archwire during functional movement and provides optimized conditions for the low-friction sliding required during the alignment stage.

[0058] The calculation method for the height (H) of the low-profile support bracket is as follows: ;in, B is the thickness of the base plate, preferably 0.20 mm; C is the depth of the groove (5) which is calculated and verified to be the optimal value; C is the minimum wall thickness from the top of the groove to the surface of the low-section support body 21, and its design must meet the allowable stress requirements of the material.

[0059] The calculated height of 0.82 mm fully reflects the low profile characteristic of the present invention. Compared with the traditional lingual bracket with a height of 1.5 mm, the low profile bracket body 21 of the present application with a height of 0.80 mm is reduced by about 46.7%, which is the key design basis for its ability to work in conjunction with bracketless clear aligners while taking into account strength.

[0060] Step D: Several upper mold bases 41 designed according to the shape of the back side of the bracket base 22 are simultaneously set on the upper mold 4, and bracket fixing holes 42 corresponding to the bracket body 23 are opened on the upper mold base 41. The lower mold 6 is designed according to the shape of the working surface of the bracket base 22, and the position of the lower mold base 61 corresponds to the position of the upper mold base 41.

[0061] In step D, during the design of the upper mold base 41 of the upper mold 4 and the lower mold base 61 of the lower mold 6, the surface data of the designed tray base 22 is imported into Magics software. Boolean operations are used to generate a solid model of the upper mold. Based on the preset relative positions of the tray body 23 and the tray base 22, the fit between the mold and the blank is precisely adjusted to ensure accurate positioning and structural fit. Through a series of operations such as direct editing and solid model combination, combined with the back surface and working surface of the solid model tray base 22, the digital designs of the upper mold base 41 and the lower mold base 61 are generated respectively.

[0062] In step D, each upper mold base 41 on the upper mold 4 is independently designed according to the different tray bases 22 required in reality, and similarly, each lower mold base 61 on the lower mold 6 is independently designed according to the different tray bases 22 required in reality.

[0063] The upper mold 4 is processed based on digital data of the lingual morphology. The cavity surface of the upper mold base 41 is perfectly matched with the back surface of the target bracket base 22. The upper mold 4 is integrally formed using high-precision 3D printing technology, which significantly shortens the mold preparation cycle and enables rapid prototyping and customized production. The upper mold base 41 is provided with a low-profile bracket body retention hole 42, which is used to limit the forming position of the metal bracket mesh blank 5 during the stamping process, as well as a mold retention hole. The mold retention hole is located at each corner of the upper mold 4, which is used to reliably fix the resin mold and the stamping retention guide plate during the stamping process, together ensuring the accuracy and stability of the stamping process.

[0064] Similarly, the lower mold 6 is processed based on digital data of the lingual morphology. The cavity surface of the lower mold base 61 is perfectly matched with the working surface of the target bracket base 22. The lower mold 6 is integrally formed using high-precision 3D printing technology, which significantly shortens the mold preparation cycle and enables rapid prototyping and customized production. The mold retaining holes are located at each corner of the lower mold 6 and are used to reliably fix the resin mold and the stamping retaining guide plate during the stamping process, thus ensuring the accuracy and stability of the stamping process.

[0065] Step E: Select a metal slotted mesh blank 5 that can simultaneously satisfy multiple upper die holders 41 for synchronous stamping, and pre-weld the slotted body 23 corresponding to each upper die holder 41 and lower die holder 61 onto the metal slotted mesh blank 5.

[0066] Step F: By placing the metal slotted mesh blank 5 on the lower mold 6, the upper mold 4 is pressed down to stamp the metal slotted mesh blank 5, forming the required low-profile slotted body 21.

[0067] Step G: Design the clear aligner 1. Based on the overall orthodontic plan in Step B, design a series of three-dimensional models of the clear aligner 1 that will gradually move the teeth. Set several receiving cavities 11 on the inner surface of the clear aligner 1, corresponding to the lingual brackets 2. The receiving cavities 11 are located on the inner surface of the clear aligner 1, corresponding to the positions of the lingual brackets 2. Design a precise receiving structure (including necessary undercuts) to ensure that the clear aligner 1 can form a mechanical interlock with the lingual brackets 2 after being worn, and apply orthodontic force in a coordinated manner. At the same time, based on biomechanical simulation, design attachments with optimized shapes at specific tooth positions to assist in achieving precise control of tooth movement.

[0068] During the stamping process, the lower die 6 is used in combination with the upper die 4. The lower die base 61 is used to stably support the metal slotted mesh blank 5 during the stamping process, and together with the cavity surface of the upper die base 41, it forms a complete and sealed forming space to ensure that the metal blank can be accurately plastically deformed into the personalized slotted base 22 required by the design under high pressure.

[0069] In actual use, a three-dimensional digital model of the patient's dentition is first obtained through intraoral scanning. Based on this, the design position of the low-profile bracket 21 is accurately located and the morphological data of the corresponding lingual side of the teeth is extracted. A personalized bracket base 22 that perfectly matches the tooth surface is designed through digital reverse engineering technology. Then, based on the surface data, a special disposable high-strength resin mold is processed and prepared.

[0070] During the manufacturing process, the prefabricated metal bracket blank 5 is precisely positioned and placed in the cavity between the upper mold 4 and the lower mold 6. A reusable stamping retention guide plate is used to fix and align the entire blank and mold as a whole. The blank is then precisely stamped using stamping equipment to form a personalized structure of the bracket base 22 that is highly adapted to the anatomical morphology of the patient's tooth surface. After stamping, the low-profile bracket body 21 undergoes a series of post-processing treatments, including deburring, electrolytic polishing, and surface sandblasting. Finally, the low-profile bracket body 21 is thoroughly cleaned, strictly disinfected, and subjected to quality inspection to complete the final product preparation.

[0071] In the initial stage of treatment, a personalized low-profile lingual bracket 2 is bonded to the key tooth position and fitted with a high-elasticity nickel-titanium archwire (a 0.018-inch diameter dual-arch segment nickel-titanium shape memory alloy round wire 3) to fully utilize the high efficiency of the lingual orthodontic system in rapid alignment and initial leveling of the dentition.

[0072] After the crowding of teeth is relieved and the shape of the dental arch is basically coordinated, the treatment enters the second stage: while retaining the lingual bracket 2, a clear aligner 1 designed specifically for this stage is worn. The clear aligner 1 is designed and generated step by step using computer-aided digital technology. During the design process of the clear aligner 1, a recessed cavity 11 is specially constructed at the location on the inner lingual side of the clear aligner 1 corresponding to the low-profile lingual bracket 2 through digital design. The cavity 11 can tightly wrap and mechanically lock onto the contour surface of the lingual bracket, thereby enhancing the retention stability and the transmission efficiency of the orthodontic force of the clear aligner 1.

[0073] During treatment, the clear aligner 1 not only applies continuous retraction force to close the extraction gap, but also, through its specially designed lingual side, forms a mating relationship with the bonded lingual bracket 2, achieving precise three-dimensional control of tooth movement during the retraction process in the anterior region. This effectively prevents adverse side effects such as tilting movement and root loss of control, ensuring overall tooth movement. Throughout the treatment, the clear aligner sequence can be adjusted or replaced as necessary based on the actual tooth movement to ensure the achievement of the final treatment goal.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention; therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0075] Although this document frequently uses reference numerals from the figures, such as: 1. Invisible aligner; 11. Receiving cavity; 2. Lingual bracket; 21. Low-profile bracket body; 22. Bracket base; 23. Bracket body; 24. Upper working wing; 25. Lower working wing; 26. Groove; 3. Shape memory alloy wire; 4. Upper mold; 41. Upper mold base; 42. Bracket retention hole; 5. Metal bracket mesh blank; 6. Lower mold; 61., etc., the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A lingual and invisible combined orthodontic treatment component, comprising a lingual bracket (2) and an invisible aligner (1) fitted over the lingual bracket (2); characterized in that, The lingual bracket (2) consists of several low-profile bracket bodies (21) and at least one shape memory alloy wire (3) sequentially threaded through each low-profile bracket body (21). The inner wall of the lingual side of the invisible aligner (1) forms several receiving cavities (11) for tightly fitting the corresponding low-profile bracket body (21). The low-profile bracket body (21) includes a bracket base (22) that fits against the lingual side of the tooth surface and a bracket body (23) connected to the bracket base (22). The bracket body (23) has an upper working wing (24) and a lower working wing (25) for locking the relative position of the lingual bracket (2) and the invisible aligner (1). The middle part of the bracket body (23) has a groove (26) for threading the shape memory alloy wire (3). The overall height of the low-profile bracket body (21) is less than 1 mm.

2. The orthodontic component for combined lingual and invisible orthodontics according to claim 1, characterized in that, The front end of the bracket body (23) is connected to the bracket base (22), and the upper working wing (24) and the lower working wing (25) are formed at the rear end of the bracket body (23), and the surfaces of the bracket body (23), the upper working wing (24) and the lower working wing (25) are flush.

3. The orthodontic component for combined lingual and invisible orthodontics according to claim 2, characterized in that, The upper working wing (24) and the lower working wing (25) are arranged along the sleeve direction of the invisible orthodontic appliance (1). The upper working wing (24) extends upward along the top of the bracket body (23) and extends downward along the bottom of the bracket body (23).

4. The orthodontic component for combined lingual and invisible orthodontics according to claim 3, characterized in that, The upper working wing (24) and the lower working wing (25) are both arc-shaped structures that bend toward the base (22) of the bracket, and two grooves (26) with corresponding shape memory alloy wires (3) are formed in the middle of the bracket body (23).

5. A method for preparing a lingual and invisible combined orthodontic treatment component, based on the lingual and invisible combined orthodontic treatment component as described in any one of claims 1-4, characterized in that, Includes the following steps: Step A: Obtain a three-dimensional digital model of the patient's dentition through intraoral scanning, and establish a digital virtual articulator that includes the teeth, gums, and occlusal relationship; Step B: Perform virtual tooth alignment on the digital model to determine the final target tooth position, plan the tooth movement path, and clarify the required gaps and overall treatment plan; Step C: Design the tongue-side bracket (2), including the shape design of the bracket base (22) and the design of the bracket body (23), design the minimum safe height of the bracket base (22), and design the corresponding upper mold (4) and lower mold (6) according to the shape of the bracket base (22). Step D: On the upper mold (4), several upper mold bases (41) designed according to the shape of the back of the tray base (22) are set simultaneously, and tray fixing holes (42) corresponding to the tray body (23) are opened on the upper mold base (41). The lower mold (6) is designed according to the shape of the working surface of the tray base (22), and the position of the lower mold base (61) corresponds to the position of the upper mold base (41). Step E: Select a metal slotted mesh plate blank (5) that can simultaneously satisfy multiple upper die holders (41) for synchronous stamping, and pre-weld the slotted body (23) corresponding to each upper die holder (41) and lower die holder (61) onto the metal slotted mesh plate blank (5). Step F: By placing the metal slotted mesh blank (5) on the lower mold (6), the upper mold (4) is pressed down to stamp the metal slotted mesh blank (5) to form the required low profile slotted body (21). Step G: Design the invisible aligner (1). Based on the overall orthodontic plan in Step B, design a series of three-dimensional models of the invisible aligner (1) that gradually moves the teeth, and set several accommodating cavities (11) corresponding to the lingual brackets (2) on the inner surface of the invisible aligner (1).

6. The method for preparing a lingual and invisible combined orthodontic treatment component according to claim 5, characterized in that, In step C, the bracket base (22) morphology design is based on the final position of each tooth after virtual tooth arrangement. The three-dimensional morphological data of the lingual surface of each tooth is extracted, and a bracket base (22) surface that perfectly matches it is designed.

7. The method for preparing a lingual and invisible combined orthodontic treatment component according to claim 5, characterized in that, In step C, the maximum equivalent stress that the bracket base (22) can withstand is satisfied as follows: , The maximum equivalent stress of the designed bracket base (22) is determined by finite element analysis, where n is the strength of the material used for the bracket base (22) and n is the safety factor. Calculations were performed to optimize the shape and height of the bracket base (22) until... .

8. The method for preparing a lingual and invisible combined orthodontic treatment component according to claim 5, characterized in that, In step C, the diameter of the groove (26) is calculated in the bracket body (23), and the minimum diameter of the groove (26) is... ,in The minimum diameter required for the groove (26), The diameter of the shape memory alloy round wire (3) is... The minimum critical embedding depth to prevent the archwire from coming loose.

9. A method for preparing a lingual and invisible combined orthodontic treatment component according to claim 5, characterized in that, In the design of the upper mold base (41) of the upper mold (4) and the lower mold base (61) of the lower mold (6) in step D, the data of the designed bracket base (22) is used to generate a solid model through Boolean operation. Based on the relative preset position of the bracket body (23) and the bracket base (22), combined with the back side and working surface of the solid model bracket base (22), the digital design of the upper mold base (41) and the lower mold base (61) is generated respectively.

10. A method for preparing a lingual and invisible combined orthodontic treatment component according to claim 5, characterized in that, In step D, each upper mold base (41) on the upper mold (4) is independently designed according to the different tray bases (22) required in reality. Similarly, each lower mold base (61) on the lower mold (6) is independently designed according to the different tray bases (22) required in reality.

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