Digital personalized dental arch bracket as well as manufacturing method and mounting method thereof

Abstract

The invention relates to the field of medical instruments, in particular to a digital personalized dental arch support which comprises a support body matched with a dentition in shape, the support body is in a wave shape, and a traction hanging piece and a fixing part used for fixing the support body to the dentition are arranged on the support body. The fixing part comprises a retention ring and a connecting piece used for connecting the retention ring and the stent body, the retention ring is located between two adjacent tooth roots and used for installing a positioning nail, and the manufacturing method comprises the steps of scanning upper and lower jaw dentitions of a patient and performing dental cone beam CT examination; and importing the three-dimensional data into three-dimensional design software to construct a tooth, gum and jaw three-dimensional model, designing a retention ring for implanting a titanium nail and a bracket curve, designing a traction hanging piece and a connecting piece for connecting the retention ring on the bracket curve, and carrying out 3D printing to obtain the personalized digital dental arch bracket. By implementing the scheme, the matching precision and the mounting efficiency of the dental arch bracket and the oral cavity of a patient are improved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a digital personalized dental arch bracket and a manufacturing method and an installation method thereof. Background Art

[0002] The arch bar is a traditional inter-maxillary traction or fixation tool that is widely used in maxillofacial fractures, jaw defect repair and reconstruction, and orthognathic surgery. Currently, the commonly used arch bar in clinical practice includes commercial alloy arch bar and personalized artificial arch bar. Traditional alloy arch bar is cumbersome to operate, and the contact with the dentition is usually multi-point and surface contact, with poor stability and easy deformation. In addition, the stainless steel wire is tied between the gums, which can easily cause periodontitis and gingivitis. On the other hand, the operation time is long. Each tooth needs to be tied and fixed to the arch bar with steel wire, and the operation time is usually about 30 minutes.

[0003] Another type of personalized artificial dental arch splint, such as publication number CN105411717B, discloses a computer-aided designed personalized dental arch splint and its manufacturing method. The dental arch splint has a "face-to-face contact" with the teeth, which makes the dental arch splint less likely to slide and more firmly retained. At the same time, it can reduce the number of ligature wires used. However, there is still the problem of periodontitis and gingivitis in the gums where the wires are ligated.

[0004] In recent years, researchers have continuously designed and improved dental arch splints. In 2019, Pankaj Pathak improved the dental arch splint by using a 1 mm drill bit to create circular holes in the alloy splint to facilitate the insertion of self-tapping titanium screws. A modified screw-retained arch bar (SRAB) was then used to secure the splint in situ. However, postoperatively, mucosal overgrowth was observed in patients receiving the SRAB.

[0005] Therefore, there is a need to design a dental arch bracket that can improve installation efficiency and reduce the risk of periodontitis and gingivitis in patients, as well as to design a manufacturing method for the dental arch bracket to improve the fitting accuracy of the dental arch bracket and the patient's oral cavity. Summary of the Invention

[0006] One of the purposes of the present invention is to provide a digital personalized dental arch bracket, by using the digital personalized dental arch bracket to reduce the risk of periodontitis and gingivitis in patients.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a digital personalized dental arch bracket, comprising a bracket body matching the shape of the dentition, the bracket body being wavy, and the bracket body being composed of multiple upper wavy parts and multiple lower wavy parts connected end to end, each lower wavy part corresponds to a tooth, and each upper wavy part corresponds to the gum between two adjacent teeth. The bracket body is provided with a traction hanger and a fixing part for fixing the bracket body to the dentition, the fixing part comprises a retaining ring and a connector for connecting the retaining ring and the bracket body, the retaining ring is located between two adjacent tooth roots and is used to install a positioning pin.

[0008] Preferably, as an improvement, the upper wavy portion and the lower wavy portion are staggered on a vertical plane, and a gap is left between the upper wavy portion and the gums.

[0009] The second purpose of the present invention is to provide a method for manufacturing a digital personalized dental arch bracket. The digital personalized dental arch bracket prepared by implementing this method can not only achieve the best fit with the patient's oral cavity, greatly improving its user experience, but also can eliminate the previous intermediate processes such as debugging the dental arch bracket during the operation, greatly improving the installation efficiency.

[0010] A method for manufacturing a digital personalized dental arch bracket comprises the following steps:

[0011] Step 1: Scan the upper and lower jaw dentition using an oral 3D scanner to obtain a 3D data model of the teeth and gums;

[0012] Step 2: The patient undergoes a dental cone-beam CT scan to obtain three-dimensional data of the teeth, jaw, and tooth roots;

[0013] Step 3: Import the 3D data from the oral 3D scanner and the 3D data from the dental cone beam CT scan into the 3D design software to construct a 3D model of the teeth, gums, and jaws to clarify the relationship between the teeth, gums, tooth roots, and jaws;

[0014] Step 4: Import the 3D model from step 3 into the surgical planning software and design a 3D model of the hole reserved for implanting the titanium nail. The hole should be designed to avoid the tooth root.

[0015] Step 5: Import the 3D model data from Steps 3 and 4 into the modeling software, and design a retention ring for implanting the titanium nail between two adjacent tooth roots based on the titanium nail hole position and the 3D models of the teeth, gums, and jawbone;

[0016] Step 6. Design the bracket body in the three-dimensional model of teeth, gums, and jaws produced in step 5: Draw a continuous bracket curve on the labial and buccal tooth neck, the lower 1 / 3 of the crown, and the junction of the free gingiva and keratinized gingiva of each tooth. The bracket curve should fit tightly on the labial and buccal tooth neck and the lower 1 / 3 of the crown, and a gap of 0.5-0.8mm should be designed between teeth in the gingival area. The cross-section of the bracket curve should be designed to be circular or quasi-circular.

[0017] Step 7: Design a traction hanger on the bracket curve, leaving a gap between the end of the traction hanger away from the bracket curve and the gum;

[0018] Step 8. Design a connector based on the position of the retaining ring to connect the retaining ring and the bracket curve, leaving a gap of 0.5-1mm between the connector and the gum;

[0019] Step 9: Use Boolean subtraction operation to generate a three-dimensional model of the dental arch bracket, and obtain a personalized digital dental arch bracket through 3D printing.

[0020] Preferably, as an improvement, in step 1, the three-dimensional data of teeth and gums are reconstructed using software to construct a three-dimensional data model of the patient's maxillary and mandibular teeth and gum tissues and their occlusal relationship.

[0021] Preferably, as an improvement, in step 6, a sketch of the stent body is drawn at the starting end of the stent curve, a circle with a diameter of 0.3cm-0.6cm is designed at the center point of the sketch, and the stent body outer structure is obtained by stretching along the stent curve as a path.

[0022] Preferably, as an improvement, in step 8, the design method of the connector is: draw a sketch on the cross section corresponding to each retaining ring and the dental arch bracket, depict a quadrilateral with the axis of the retaining ring as the center, design the thickness and width of the connector in the coordinate system of the quadrilateral, and stretch the quadrilateral to obtain the connector structure.

[0023] Preferably, as an improvement, in step 9, a Boolean subtraction operation is performed on the three-dimensional model data of teeth, gums, and jaws and the three-dimensional model data of dental arch brackets and holes, and the three-dimensional model data of teeth, gums, and jaws are subtracted from the three-dimensional model data of dental arch brackets and holes to generate three-dimensional data of the bracket body, mark the tooth position number of the corresponding tooth on the traction hanger, and then generate a three-dimensional model of the dental arch bracket corresponding to the three-dimensional data of the bracket body.

[0024] Preferably, as an improvement, in step 7, the dimensions of the traction hanger are designed to be: 2.5 mm in length, 1.6 mm in width, and 1 mm in thickness.

[0025] The third object of the present invention is to provide a method for installing a digital personalized dental arch bracket, by implementing the installation method, the installation of the dental arch bracket can be completed quickly and efficiently.

[0026] A method for installing a digital personalized dental arch bracket comprises fully disinfecting the patient's oral cavity, and installing the dental arch bracket in the patient's oral cavity after disinfection, wherein each lower wavy portion corresponds to each tooth, and each upper wavy portion corresponds to the gum between two adjacent teeth, and then implanting the bracket into the alveolar bone between two adjacent tooth roots along a retention ring through a titanium nail, and finally using a traction tool to connect the bracket to the traction hangers of the maxilla and mandible.

[0027] The principles and advantages of this solution are:

[0028] 1. Easy installation and short installation time: This solution only requires the dental arch bracket to be placed on the teeth, where each retaining ring is located between two adjacent tooth roots, and then fixed in the alveolar bone through the positioning pins passing through the retaining ring, thereby achieving rapid fixation of the dental arch bracket and the teeth. The entire installation time does not exceed 10 minutes, which is up to 3 times more efficient than the traditional method.

[0029] 2. Effectively reduce the risk of periodontitis and gingivitis: On the one hand, this solution does not require the use of stainless steel wire to tie the gums between adjacent teeth, so it will not cause periodontitis and gingivitis problems; on the other hand, by staggering the upper and lower wavy parts on the vertical plane and leaving a gap between the upper wavy part and the gums, it avoids direct contact between the bracket body and the patient's gums, causing compression, incarceration and other discomfort.

[0030] 3. To avoid the risk of damage to the patient's tooth roots and the risk of doctors being stabbed, this solution designs a retention ring in the gap between the two tooth roots. The doctor directly uses the retention ring to locate the self-drilling titanium nail for fixation without the need for wire ligation. Therefore, it effectively avoids the risk of damage to the patient's tooth roots and fracture, as well as the risk of doctors being stabbed.

[0031] 4. This method customizes a digital personalized dental arch bracket according to the oral conditions of different patients. The dental arch bracket is customized according to the actual oral conditions of the patient. For example, the side of the retaining ring and the connector close to the gum is designed according to the specific conditions of the patient's gums to ensure that the entire end face of the retaining ring fits the gums to avoid local compression problems. The connector has a certain curvature and maintains a certain gap with the gums to avoid causing pressure on the gums. At the same time, the side of the traction pendant away from the gums is designed to be an arc that adapts to the patient's lips. There is no need for the doctor to bend and adjust the traction pendant during the later installation process. On the one hand, it improves the installation efficiency, and on the other hand, it avoids causing discomfort to the patient. On the other hand, manual bending and debugging usually have errors, and cannot achieve the best fit with the patient's lips, which affects the patient's experience during later use.

[0032] Therefore, the digital personalized dental arch bracket prepared by this method can not only achieve the best fit with the patient's oral cavity, greatly improving the user experience, but also eliminate the previous intermediate processes such as debugging the dental arch bracket during the operation, greatly improving the installation efficiency.

[0033] 5. This method combines oral scan 3D data with a 3D model created using dental cone-beam CT data to clearly and intuitively understand the relationship between the patient's teeth, gums, roots, and jawbone. This allows for the precise design of the retention ring between the two roots, thus avoiding the serious problem of root damage during the subsequent implantation of titanium screws. At the same time, the lower undulations of the dental arch bracket can be precisely aligned one-to-one with each tooth, and the upper undulations can be precisely aligned with the gums between adjacent teeth. This prevents misalignment, which can lead to problems such as misalignment where teeth should be pressed and tight compression where gaps should be left on the gums.

[0034] 6. This solution makes the dental arch bracket more firmly fixed through the ingenious design of the dental arch bracket and the coordinated cooperation of the installation position: by placing the lower wavy part of the bracket body close to the teeth, and the upper wavy part corresponding to the space between adjacent teeth, and the extension path there just corresponds to the space between the roots of the two teeth, the retaining ring is installed on the upper wavy part through the connecting piece. On the one hand, it is convenient for the implantation of titanium nails to avoid damaging the tooth roots, and on the other hand, it can greatly shorten the distance between the retaining ring (fixing point) and the bracket body, thereby greatly improving the stability of the dental arch bracket to the teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural diagram of the digital personalized dental arch bracket of the present invention.

[0036] Figure 2 This is a 3D scan of the oral cavity.

[0037] Figure 3 This is a dental cone-beam CT image.

[0038] Figure 4 This is a three-dimensional model of teeth, gums, and jaws.

[0039] Figure 5 This is a 3D model of teeth, gums, and jaws in surgical planning software.

[0040] Figure 6 Diagram of reserved holes for titanium nail implantation.

[0041] Figure 7 This is a three-dimensional model diagram for designing a retention ring.

[0042] Figure 8 This is the design drawing of the bracket curve.

[0043] Figure 9Schematic diagram of the structural design of the bracket body.

[0044] Figure 10 This is a schematic diagram of the structural design of the traction pendant.

[0045] Figure 11 Schematic diagram of the structural design of the connector.

[0046] Figure 12 Schematic diagram of the structure of the dental arch bracket.

[0047] Figure 13 This is the finished image of the digitally personalized dental arch bracket.

[0048] The reference numerals in the drawings of the specification include: a bracket body 1 , an upper wavy portion 2 , a lower wavy portion 3 , a traction hanger 4 , a retaining ring 5 , and a connecting member 6 . DETAILED DESCRIPTION

[0049] The following is further described in detail through specific implementation methods:

[0050] The embodiment is basically as shown in the attached Figure 1 A digital personalized dental arch bracket is shown, comprising a bracket body 1 that matches the curvature of the dentition. The bracket body is circular or quasi-circular. In this embodiment, a circular shape is used as an example, with a diameter of 0.3 cm to 0.6 cm. This thickness provides strong fastening without causing oral discomfort to the patient. For adolescents and adults, the bracket body diameter is 0.5 cm to 0.6 cm, while for the elderly, the bracket body diameter is 0.3 cm to 0.4 cm. The bracket body 1 is wavy in shape, specifically comprising a plurality of upper wavy portions 2 and a plurality of lower wavy portions 3 connected end to end. Each lower wavy portion 3 corresponds to a tooth, and each upper wavy portion 2 corresponds to the gum between two adjacent teeth. The upper and lower wavy portions 2 and 3 are offset in a vertical plane. This offset allows the lower wavy portions 3 to adhere tightly to the teeth, providing a fastening effect on the dentition. Furthermore, a certain gap is provided between the upper wavy portion 2 and the gum, preventing the bracket body 1 from directly contacting the patient's gums and causing discomfort such as compression or incarceration. Specifically, the gap between the upper wavy portion 2 and the gums is 0.5-0.8 mm. If the range is too large, the dental arch bracket will affect the movement of the patient's lips. If the range is too small, if the patient's gums swell after the operation, it will cause gum pressure and discomfort.

[0051] The stent body 1 is provided with a traction hanger 4 and multiple fixing portions for securing the stent body 1 to the dentition. Both the traction hanger 4 and the fixing portions are provided with an upper wavy portion 2. In this embodiment, four fixing portions are provided, two on each side of the incisors. The fixing portion comprises a retaining ring 5 and a connector 6. The two ends of the connector 6 are fixedly connected to the retaining ring 5 and the stent body 1, respectively. The retaining ring 5 is used to install a positioning pin, which is a titanium pin. During use, the positioning pin is passed through the retaining ring and fixed in the alveolar bone, thereby quickly securing the stent body 1 to the dentition. Compared to the traditional method of ligating each tooth to the stent body 1 with a steel wire, this greatly improves surgical efficiency. The retaining ring 5 is also located in the alveolar bone between two adjacent tooth roots to avoid root damage. The retaining ring 5 and the connector 6 are curved on the side facing away from the gums, and both are on the same curved surface. This design enhances the comfort of the lips when they come into contact with them. The inner diameter of the retaining ring 5 is designed to be 2 mm to match the diameter of clinical titanium pins. At the same time, the end surface of the retaining ring 5 close to the gum is consistent with the curvature of the gum, so as to avoid the retaining ring 5 causing local damage to the gum when the titanium nail fixes the retaining ring 5.

[0052] A certain gap exists between the traction hanger 4 and the gums, allowing a traction wire or medical rubber band to be installed on the traction hanger 4 of the upper and lower bracket bodies 1 during use to limit the opening and closing of the mouth. The side of the traction hanger 4 facing away from the gums is curved, and the end facing away from the bracket body 1 is rounded to enhance the comfort of contact between the traction hanger 4 and the lips. In this embodiment, the dimensions of the traction hanger 4 are designed to be 2.5mm long, 1.6mm wide, and 1mm thick. After multiple adjustments and refinements, these dimensions ensure stable performance during use while maximizing oral comfort for the patient.

[0053] In addition, the edges of the traction hanger, retention ring, and connector are all rounded to enhance the comfort of wearing the dental arch bracket.

[0054] A method for manufacturing a digital personalized dental arch bracket comprises the following steps:

[0055] Step 1: Use an oral 3D scanner to scan the patient's upper and lower dentition, and use the scanner's built-in software to build a 3D data model of the patient's upper and lower teeth and gum tissue and their occlusal relationship based on the 3D data of the teeth and gums. Figure 2 As shown, and exported as STL file for use;

[0056] Step 2: After the patient undergoes dental cone beam CT examination, the data is imported into 3D software to construct and display the teeth, jaws, and tooth roots in 3D. Figure 3 As shown, then export the STL file for future use;

[0057] Step 3: Import the STL files in step 1 and step 2 into the 3D design software to build the 3D models of teeth, gums and jaws. Figure 4 As shown, in order to clarify the relationship between teeth, gums, tooth roots and jaws, export the STL file for future use;

[0058] Step 4: Import the 3D model STL file from step 3 into the surgical planning software. Figure 5 As shown in the figure, a three-dimensional model of the hole reserved for implanting titanium nails is designed. The hole should avoid the tooth root during design.

[0059] Specifically: After confirming the implant site (such as between tooth position numbers 13-12, 14-15, 16-17, 22-23, 24-25, 26-27, 33-32, 34-35, 36-37, 42-43, 44-45, 46-47, etc.), implant the prefabricated titanium nail in the positioning area in the 3D implant software, which can visually display the relationship between the titanium nail and the tooth root. Avoid the tooth root during design and adjust the 3D position and axial direction. Use the software to generate the titanium nail hole showing the axial position, and generate the hole position data corresponding to the titanium nail hole at this position, and export it as an STL file and implant report for use and discussion, such as Figure 6 shown.

[0060] Step 5: Import the 3D model data from Steps 3 and 4 into the modeling software and determine the position and axis of the titanium nail hole again. Then, based on the titanium nail hole position and the 3D model of the teeth, gums, and jawbone, design a retaining ring 5 for implanting the titanium nail between two adjacent tooth roots. The inner diameter of the retaining ring 5 is 2mm to match the diameter of the clinical titanium nail. Then generate data corresponding to the retaining ring 5, as shown in the following figure: Figure 7 shown.

[0061] Step 6: Design the bracket body 1 in the three-dimensional model of teeth, gums and jaws in step 5: Figure 8 As shown, a continuous bracket curve is drawn on the labial and buccal tooth neck, the lower 1 / 3 of the crown, and the junction of the free gingiva and the keratinized gingiva of each tooth. The bracket curve fits tightly on the labial and buccal tooth neck and the lower 1 / 3 of the crown, and a 0.7mm gap is designed in the gingival area between teeth to avoid direct contact between the designed dental arch bracket and the patient's gums, causing discomfort such as compression and incarceration. A sketch of the bracket body 1 is drawn at the starting end of the bracket curve, and a circle or quasi-circle with a diameter of 0.3cm-0.6cm is designed at the center point of the sketch. The outer structure of the bracket body 1 is obtained by stretching it along the bracket curve as a path, as shown in FIG. Figure 9 shown.

[0062] Step 7: Design a traction hanger 4 on the bracket curve. A gap is left between the end of the traction hanger 4 away from the bracket curve and the gum. The shape of the traction hanger 4 is circular, quasi-circular, or polygonal. In this embodiment, it is a quadrilateral structure. Its dimensions are designed to be 2.5 mm long, 1.6 mm wide, and 1 mm thick. Figure 10 As shown;

[0063] Step 8: Design a connector 6 according to the position of the retaining ring 5 to connect the retaining ring 5 and the bracket curve. Keep a gap of 0.7mm between the connector 6 and the gum to avoid direct contact between the designed connector 6 and the patient's gum. The design method of the connector 6 is as follows: draw a sketch on the cross section corresponding to each retaining ring 5 and the dental arch bracket, draw a quadrilateral with the axis of the retaining ring 5 as the center, design the thickness and width of the connector 6 in the coordinate system of the quadrilateral, and stretch the quadrilateral to obtain the connector 6 structure, as shown in the figure. Figure 11 shown.

[0064] Step 9: Use Boolean subtraction operation to generate a three-dimensional model of the dental arch bracket, and obtain a personalized digital dental arch bracket through 3D printing.

[0065] Specifically, Boolean subtraction is performed on the three-dimensional model data of teeth, gums, and jaws and the three-dimensional model data of dental arch brackets and holes, and the three-dimensional model data of teeth, gums, and jaws are subtracted from the three-dimensional model data of dental arch brackets and holes to generate three-dimensional data of dental arch brackets. The tooth position number of the corresponding tooth is marked on the traction hanger 4 corresponding to each tooth of the upper and lower jaws, and then a three-dimensional model of the dental arch bracket corresponding to the three-dimensional data of the bracket body is generated, and the three-dimensional data STL file of the dental arch bracket is exported, such as Figure 12 As shown, the file is imported into the 3D additive printer, and the additive material is pure titanium. After running the operation, the 3D printing is performed to obtain a personalized digital dental arch bracket made of pure titanium, as shown in FIG. Figure 13 shown.

[0066] A method for installing a digital personalized dental arch bracket is provided. The dental arch bracket is suitable for patients undergoing orthognathic surgery for jaw defect repair and reconstruction, jaw fracture, and invisible correction.

[0067] Before the operation, the patient's oral cavity is fully disinfected, and the dental arch bracket customized for the patient's oral condition is disinfected. Then the upper and lower dental arch brackets are installed on the maxillary and mandibular respectively. The dental arch bracket installed on the maxillary is taken as an example: each lower wave portion 3 is tightly attached to each tooth. In this embodiment, the crown neck position (such as Figure 11 Each upper wavy portion 2 corresponds to the gum between two adjacent teeth and is then implanted into the alveolar bone between two adjacent tooth roots via a titanium screw along a retaining ring 5. After the maxillary and mandibular arch supports are installed, traction tools (traction wires, medical rubber bands, etc.) are used to connect them to the maxillary and mandibular traction hangers 4.

[0068] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A digital personalized dental arch bracket, characterized by: It includes a bracket body that matches the shape of the dentition, the bracket body is wavy, and the bracket body is composed of multiple upper wavy parts and multiple lower wavy parts connected end to end, each lower wavy part corresponds to a tooth, and each upper wavy part corresponds to the gum between two adjacent teeth. The bracket body is provided with a traction hanger and a fixing part for fixing the bracket body on the dentition, the fixing part includes a retaining ring and a connecting piece for connecting the retaining ring and the bracket body, the retaining ring is located between two adjacent tooth roots and is used to install a positioning pin.

2. The digital personalized dental arch bracket according to claim 1, characterized in that: The upper wavy portion and the lower wavy portion are staggered on a vertical plane, and a gap is left between the upper wavy portion and the gum.

3. The method for manufacturing a digital personalized dental arch bracket according to claim 2, characterized in that: The following steps are involved: Step 1: Use an oral 3D scanner to scan the patient's upper and lower dentition to obtain a 3D data model of the teeth and gums; Step 2: The patient undergoes a dental cone-beam CT scan to obtain three-dimensional data of the teeth, jaw, and tooth roots; Step 3: Import the 3D data from the oral 3D scanner and the 3D data from the dental cone beam CT scan into the 3D design software to construct a 3D model of the teeth, gums, and jaws to clarify the relationship between the teeth, gums, tooth roots, and jaws; Step 4: Import the 3D model from step 3 into the surgical planning software and design a 3D model of the hole reserved for implanting the titanium nail. The hole should be designed to avoid the tooth root. Step 5: Import the 3D model data from Steps 3 and 4 into the modeling software, and design a retention ring for implanting the titanium nail between two adjacent tooth roots based on the titanium nail hole position and the 3D models of the teeth, gums, and jawbone; Step 6. Design the bracket body within the three-dimensional model of teeth, gums, and jaws created in Step 5: Draw a continuous bracket curve on the labial and buccal tooth neck, the lower 1 / 3 of the crown, and the junction of the free gingiva and keratinized gingiva of each tooth. The bracket curve should fit tightly within the labial and buccal tooth neck and the lower 1 / 3 of the crown, and a gap of 0.5-0.8mm should be designed between teeth in the gingival area. The cross-section of the bracket curve should be designed to be circular or quasi-circular. Step 7: Design a traction hanger on the bracket curve, leaving a gap between the end of the traction hanger away from the bracket curve and the gum; Step 8. Design a connector based on the position of the retaining ring to connect the retaining ring and the bracket curve, leaving a gap of 0.5-1mm between the connector and the gum; Step 9: Use Boolean subtraction operation to generate a three-dimensional model of the dental arch bracket, and obtain a personalized digital dental arch bracket through 3D printing.

4. The method for manufacturing a digital personalized dental arch bracket according to claim 3, characterized in that: In step 1, the three-dimensional data of teeth and gums are reconstructed using software to construct a three-dimensional data model of the patient's maxillary and mandibular teeth and gum tissue and their occlusal relationship.

5. The method for manufacturing a digital personalized dental arch bracket according to claim 4, characterized in that: In step 6, a sketch of the stent body is drawn at the starting end of the stent curve, a circle with a diameter of 0.3cm-0.6cm is designed at the center point of the sketch, and the stent body outer structure is obtained by stretching along the stent curve.

6. The method for manufacturing a digital personalized dental arch bracket according to claim 5, characterized in that: In step 8, the design method of the connector is: draw a sketch on the cross section corresponding to each retaining ring and the dental arch bracket, draw a quadrilateral with the axis of the retaining ring as the center, design the thickness and width of the connector in the coordinate system of the quadrilateral, and stretch the quadrilateral to obtain the connector structure.

7. The method for manufacturing a digital personalized dental arch bracket according to claim 6, characterized in that: In step 9, a Boolean subtraction operation is performed on the three-dimensional model data of teeth, gums, and jaws and the three-dimensional model data of dental arch brackets and holes. The three-dimensional model data of teeth, gums, and jaws are subtracted from the three-dimensional model data of dental arch brackets and holes to generate three-dimensional data of dental arch brackets. The tooth position number of the corresponding tooth is marked on the traction hanger, and then a three-dimensional model of the dental arch bracket corresponding to the three-dimensional data of the bracket body is generated.

8. The method for manufacturing a digital personalized dental arch bracket according to claim 7, characterized in that: In step 7, the dimensions of the traction hanger are designed to be: 2.5 mm in length, 1.6 mm in width, and 1 mm in thickness.

9. The method for manufacturing a digital personalized dental arch bracket according to claim 8, characterized in that: The traction hanger and the fixing part are both installed on the upper wave part.

10. A method for installing a digital personalized dental arch bracket according to claims 1-9, characterized in that: After fully disinfecting the patient's mouth and the dental arch bracket, install it in the patient's mouth, where each lower wave portion corresponds to each tooth, and each upper wave portion corresponds to the gum between two adjacent teeth. Then, a titanium nail is implanted along the retention ring into the alveolar bone between two adjacent tooth roots. Finally, use a traction tool to connect it to the traction pendants of the maxilla and mandible.

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