An intermaxillary traction tooth surface fixing device and its digital manufacturing method

Abstract

The present invention discloses an intermaxillary traction tooth surface fixing device, its digital manufacturing method and application. The fixing device includes an upper jaw tooth surface fixing component applicable to the upper jaw and a lower jaw tooth surface fixing component applicable to the lower jaw. The upper jaw tooth surface fixing component includes a tooth surface bonding attachment A bonded to the labial tooth surfaces of each tooth in the upper jaw, a connecting rod A connecting two adjacent tooth surface bonding attachments A, and further includes a traction hook A extending towards the gingival side and arranged on the connecting rod A. The lower jaw tooth surface fixing component includes a tooth surface bonding attachment B bonded to the labial tooth surfaces of each tooth in the lower jaw, a connecting rod B connecting two adjacent tooth surface bonding attachments B, and further includes a traction hook B extending towards the gingival side and arranged on the connecting rod B.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to an intermaxillary traction tooth surface fixing device for oral cavity and its manufacturing method and application. Background Art

[0002] Status quo of the prior art: For patients undergoing orthodontic treatment of oral teeth, especially those undergoing invisible orthodontic treatment for orthognathic surgery, when intermaxillary traction treatment or intermaxillary ligation is required, such as when wearing stable splints on the upper and lower jaws for intermaxillary ligation after orthognathic surgery, it is very difficult to directly perform through the original orthodontic appliance, and additional tools are often required to achieve it. For example, endosseous implant anchorage screws are implanted in the oral vestibular sulcus of the upper and lower jaws, and intermaxillary ligation of the upper and lower jaws is achieved through the anchorage screws.

[0003] For example, a traction screw for intermaxillary ligation is disclosed in Chinese Patent CN213552251U. Its purpose is to perform intermaxillary ligation to temporarily fix the upper and lower jaws together and use the intermaxillary ligation screw as a strut for force generation. Although the specific structure of the traction screw is optimized in this patent, it still needs to be implanted into the patient's jawbone.

[0004] Defects or problems existing in the prior art and the above patent are as follows: 1. Implanting and removing endosseous implant anchorage screws in the oral vestibular sulcus of the upper and lower jaws bring additional wounds and pain to the patient, prolong the postoperative healing time and increase the physical burden on the patient. 2. Increase the operation time. 3. The anchorage screw may have adverse side effects, such as loosening and falling off of the anchorage screw, adjacent root resorption, alveolar bone resorption, bone fenestration and bone cracking at the implantation site, etc. 4. Difficulty in oral cleaning and maintenance after surgery increases the economic burden on the patient.

[0005] In addition, Chinese Patent CN103405276B discloses "a fixed orthodontic appliance obtained according to the above method, which is characterized by including: a force application unit: made of SMP material, having a personalized three-dimensional spatial geometric structure matching the personalized orthodontic plan, and used to provide the complex three-dimensional forces and moments required for tooth movement to achieve tooth translation, root control, rotation, torsion and other movements; a fixation unit: made of a high-strength polymer material, fitting the crown surface of each tooth, having a personalized shape, and providing the fixation force of the appliance during the orthodontic treatment; since the tooth surface has a complex curved surface structure, self-positioning can be achieved by closely fitting the fixation unit with the tooth surface without additionally designing a positioning guide plate for indirect pasting; attachments: used to provide forces and moments at special positions and with special requirements, such as various bends and hooks; the force application unit, the fixation unit and the attachments are in seamless contact through a geometric model and use a buckle structure to increase the connection force, and are manufactured by three-dimensional printing in one piece". The above patent is essentially a solution that evolves traditional arch wires and brackets into an integral whole (paragraph 0005 of the specification), and essentially still corrects and moves teeth during orthodontics. Moreover, CT data is required in this patent, and appliances with different parameters need to be applied according to different treatment stages, and the wearing time runs through the entire orthodontic process. At present, those skilled in the art only use it as a substitute for arch wires and brackets during orthodontics and have never considered applying it elsewhere. Summary of the Invention

[0006] In view of this, the present invention provides an intra-maxillary traction tooth surface fixing device capable of realizing intra-maxillary traction, and its 3D printing preparation method and application. The tooth surface fixing device of the present invention can replace the traction or ligation between the upper and lower jaws that originally required the implantation of intra-bony anchorage screws in the oral vestibular sulcus of the upper and lower jaws during orthognathic treatment, solve the problems of long operation time, heavy physical and mental burden on patients, difficult cleaning, and heavy economic burden caused by the implantation of intra-bony anchorage screws, and also solve the side effects such as loosening and falling off, root resorption, alveolar bone resorption, and bone fenestration and bone dehiscence at the implantation position brought about by the implantation of the anchorage screws themselves.

[0007] The first object of the present invention is to provide an intra-maxillary traction tooth surface fixing device applied to orthognathic treatment.

[0008] An intermaxillary traction dental surface fixing device applied to orthognathic treatment, characterized in that: it includes an upper jaw dental surface fixing component applicable to the upper jaw and a lower jaw dental surface fixing component applicable to the lower jaw; the upper jaw dental surface fixing component includes dental surface bonding attachments A bonded to the labial surfaces of each tooth in the upper jaw, a connecting rod A connecting two adjacent dental surface bonding attachments A, and further includes a traction hook A extending towards the gingival side and arranged on the connecting rod A; the lower jaw dental surface fixing component includes dental surface bonding attachments B bonded to the labial surfaces of each tooth in the lower jaw, a connecting rod B connecting two adjacent dental surface bonding attachments B, and further includes a traction hook B extending towards the gingival side and arranged on the connecting rod B. The dental surface bonding attachments A are multiple and correspond to each tooth in the upper jaw respectively; the dental surface bonding attachments B are multiple and correspond to each tooth in the lower jaw respectively. The dental surface bonding attachments A on the dental surfaces of each tooth in the upper jaw are connected into one body through the connecting rod B. The dental surface bonding attachments B on the dental surfaces of each tooth in the lower jaw are connected into one body through the connecting rod B. The dental surface bonding attachments A on the dental surfaces of each tooth in the upper jaw are divided into two or more regions, and the dental surface bonding attachments A in each region are connected into one body through the connecting rod A. The dental surface bonding attachments B on the dental surfaces of each tooth in the lower jaw are divided into two or more regions, and the dental surface bonding attachments B in each region are connected into one body through the connecting rod B. The bonding surfaces of the dental surface bonding attachments A and the dental surface bonding attachments B are arcs that fit the shapes of the corresponding tooth surfaces before orthognathic surgery, and the connecting rods A and the connecting rods B are dental arch arcs with the same curvature as the dental arch between the corresponding adjacent tooth surfaces before orthognathic surgery. A ligature wire for realizing intermaxillary traction of the upper and lower teeth is arranged between the traction hook A of the upper jaw dental surface fixing component and the traction hook B of the lower jaw dental surface fixing component. Holes or grooves for avoiding orthodontic attachments bonded to the tooth surfaces are arranged on the dental surface bonding attachments A and / or the dental surface bonding attachments B,

[0009] 2. The second object of the present invention is to provide a 3D printing digital preparation method for an intermaxillary traction dental surface fixing device applied to orthognathic treatment, characterized in that it includes the following steps:

[0010] Step 1: Image acquisition and processing,

[0011] Scan the three-dimensional topography data of the dental arch after the end of orthodontics before orthognathic surgery through an intraoral scanner;

[0012] Step 2: Design of the intermaxillary traction dental surface fixing device,

[0013] According to the three-dimensional topography data of the dental arch obtained in Step 1, design dental surface bonding attachments A that fit the labial surfaces of each tooth in the upper jaw, design a connecting rod A that conforms to the curvature of the dental arch between adjacent dental surface bonding attachments A, the connecting rod A connects adjacent dental surface bonding attachments, and design a traction hook A towards the gingival side on the connecting rod;

[0014] According to the three-dimensional dental topography data obtained in Step 1, a dental surface bonding attachment B that fits the labial surfaces of each tooth in the mandible is designed. A connecting rod B that conforms to the curvature of the dental arch is designed between adjacent dental surface bonding attachments B. The connecting rod B connects adjacent dental surface bonding attachments, and a traction hook B facing the gingival side is designed on the connecting rod.

[0015] Step 3: Use a 3D printing device to print and form the intermaxillary traction dental surface fixing device designed in Step 2.

[0016] 3. The third object of the present invention is to provide the application of the above-mentioned intermaxillary traction dental surface fixing device in the traction treatment between the upper and lower jaws in the orthognathic treatment plan;

[0017] When there are no orthodontic correction attachments bonded to the dental surface: Bond the upper dental surface fixing component of the intermaxillary traction dental surface fixing device to the upper dental surface, bond the lower dental surface fixing component of the intermaxillary traction dental surface fixing device to the lower dental surface, and use ligature wire to ligate the traction hook A and traction hook B of the upper dental surface fixing component for intermaxillary traction.

[0018] When there are orthodontic correction attachments bonded to the dental surface: Bond the upper dental surface fixing component of the intermaxillary traction dental surface fixing device to the dental surface between the orthodontic correction attachment of the upper tooth and the gingival side, bond the lower dental surface fixing component of the intermaxillary traction dental surface fixing device to the dental surface between the orthodontic correction attachment of the lower tooth and the gingival side, use ligature wire to ligate the traction hook A and traction hook B of the upper dental surface fixing component for intermaxillary traction; or, bond it to the dental surface after avoiding or covering the orthodontic correction attachment through the holes or grooves designed on the dental surface bonding attachment A and dental surface bonding attachment B.

[0019] Due to the adoption of the above technical solutions, the present invention has the following advantages:

[0020] 1. The present invention uses an intermaxillary traction dental surface fixing device bonded to the dental surface, which can replace the intraosseous anchorage screws implanted in the vestibular sulcus in the prior art, solve the problems of long operation time, heavy physical and mental burden on patients, difficult cleaning, and heavy economic burden caused by the implantation of intraosseous anchorage screws, and also avoid the side effects such as loosening and falling off, root resorption, alveolar bone resorption, and bone fenestration and bone dehiscence at the implantation site brought by the implantation of the anchorage screws themselves.

[0021] 2. The bonding attachment of the present invention is based on a digital dental model, can effectively fit the dental surface, has a large bonding strength, has an enhanced retention effect, and is simple to remove the device after surgery.

[0022] 3. In the present invention, the bonding attachments are connected into an integral body through a connecting rod, which can realize the integrity of the attachments within a single jaw, play a three-dimensional spatial fixing role, and the traction hooks are arranged on the connecting rod, which is firm and reliable, and is stable and reliable during intermaxillary ligation.

[0023] 4. This solution is designed based on a digital tooth model. Through 3D printing technology, it has high personalized precision, is easy to install, has high repeatability, strong stability, low cost, convenient postoperative maintenance, and simple removal with low cost. Description of the Drawings

[0024] The drawings of the present invention are described as follows.

[0025] Figure 1 It is an application diagram of the intermaxillary traction tooth surface fixing device applied to orthognathic treatment of the present invention;

[0026] Figure 2 It is a structural diagram of the maxillary tooth surface fixing component of the intermaxillary traction tooth surface fixing device;

[0027] Figure 3 It is a structural diagram of the mandibular tooth surface fixing component of the intermaxillary traction tooth surface fixing device. Detailed Description of the Embodiments

[0028] The embodiments of the present application are described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application. On the contrary, the embodiments of the present invention include all changes, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0029] Embodiment 1: As Figures 1-3 shown, this embodiment first provides an intermaxillary traction tooth surface fixing device applied to orthognathic treatment, which includes a maxillary tooth surface fixing component applicable to the maxilla and a mandibular tooth surface fixing component applicable to the mandible. The maxillary tooth surface fixing component includes a tooth surface bonding attachment A1 bonded to the labial tooth surfaces of each tooth in the maxilla, a connecting rod A2 for connecting two adjacent tooth surface bonding attachments A in the maxilla, and further includes a traction hook A3 extending towards the gingival side provided on the connecting rod A; the mandibular tooth surface fixing component includes a tooth surface bonding attachment B4 bonded to the labial tooth surfaces of each tooth in the mandible, a connecting rod B5 for connecting two adjacent tooth surface bonding attachments B in the mandible, and further includes a traction hook B6 extending towards the gingival side provided on the connecting rod B.

[0030] In this embodiment, there are multiple tooth surface bonding attachments A, which respectively correspond to each tooth in the upper jaw, and the tooth surface bonding attachments A on the tooth surfaces of each tooth in the upper jaw are connected into one body by the connecting rod A. There are multiple tooth surface bonding attachments B, which respectively correspond to each tooth in the lower jaw, and the tooth surface bonding attachments B on the tooth surfaces of each tooth in the lower jaw are connected into one body by the connecting rod B. And traction hooks A extending towards the gingival side of the upper jaw are provided on the connecting rod A, and traction hooks B extending towards the gingival side of the lower jaw are also provided on the connecting rod B. The traction hooks can be provided on each connecting rod A / B, or can be selectively provided on different connecting rods according to requirements. As an implementation manner in this embodiment, the tooth surface bonding attachment A, the connecting rod A and the traction hook A are of the same material and integrally formed, the tooth surface bonding attachment B, the connecting rod B and the traction hook B are of the same material and integrally formed, and the material can be selected as resin.

[0031] As another implementation manner in this embodiment, the tooth surface bonding attachments A on the tooth surfaces of each tooth in the upper jaw are divided into two or more regions, and the tooth surface bonding attachments A in each region are connected into one body by the connecting rod A. The tooth surface bonding attachments B on the tooth surfaces of each tooth in the lower jaw are divided into two or more regions, and the tooth surface bonding attachments B in each region are connected into one body by the connecting rod B. For example, when divided into two regions, the bonding attachment A and the connecting rod A on the left side region can be integrated, and the bonding attachment A and the connecting rod A on the right side can be integrated; when divided into three regions, the bonding attachment A and the connecting rod A on the left molars can be integrated, the bonding attachment A and the connecting rod A on the right molars can be integrated, and the bonding attachment A and the connecting rod A on the middle incisors and canines can be integrated, or the regions can be divided according to the tooth extraction position. And traction hooks A extending towards the gingival side of the upper jaw are provided on each connecting rod A, and traction hooks B extending towards the gingival side of the lower jaw are also provided on each connecting rod B. The traction hooks can be provided on each connecting rod, or can be selectively provided on different connecting rods according to requirements. As an implementation manner in this embodiment, the tooth surface bonding attachment A, the connecting rod A and the traction hook A in the same region are of the same material and integrally formed, the tooth surface bonding attachment B, the connecting rod B and the traction hook B in the same region are of the same material and integrally formed, and the material can be selected as resin.

[0032] Moreover, in this embodiment, the bonding surfaces of the tooth surface bonding attachment A and the tooth surface bonding attachment B are arcs that fit the shapes of the corresponding tooth surfaces after orthodontic treatment and before orthognathic surgery, and the connecting rod A and the connecting rod B are in the shape of an arch arc with the same curvature as the dental arch between the corresponding adjacent two tooth surfaces before orthognathic surgery. A ligature wire for achieving intermaxillary traction of the upper and lower teeth is provided between the traction hook A of the upper jaw tooth surface fixing assembly and the traction hook B of the lower jaw tooth surface fixing assembly.

[0033] During orthognathic treatment, before orthognathic surgery, the maxillary tooth surface fixing component in this embodiment is bonded to the labial tooth surface of the patient's maxillary teeth, and the mandibular tooth surface fixing component is bonded to the labial tooth surface of the patient's mandibular teeth, replacing the intraosseous implant anchorage pins implanted during the surgery, and performing intermaxillary ligation after the surgery. During ligation, the traction hook A of the maxillary tooth surface fixing component and the traction hook B of the mandibular tooth surface fixing component are ligated together through a ligature wire to achieve traction treatment between the upper and lower jaws after the surgery.

[0034] In addition, for patients who still need orthodontics after orthognathic treatment, orthodontic appliances may still be bonded to their tooth surfaces. For such patients, when designing the intermaxillary traction tooth surface fixing device, holes for the orthodontic appliances can be designed on the tooth surface bonding attachment A and the tooth surface bonding attachment B to avoid the orthodontic appliances so as to be bonded to the tooth surface.

[0035] Of course, the orthodontic appliances can also be regarded as a part of the tooth surface. When designing the intermaxillary traction tooth surface fixing device, the bonding surfaces of the tooth surface bonding attachment A and the tooth surface bonding attachment B are designed to fit the curved surface including the orthodontic appliances. It is equivalent to designing grooves on the tooth surface bonding attachment A and the tooth surface bonding attachment B to wrap the orthodontic appliances.

[0036] Or the maxillary tooth surface fixing component can be directly bonded to the tooth surface between the orthodontic appliance and the upper gingiva, and the mandibular tooth surface fixing component can be bonded to the attachment between the orthodontic appliance and the lower gingiva. When designing the tooth surface bonding attachments A and B, the bonding surfaces fitting the tooth surface are designed according to the bonding positions.

[0037] Embodiment 2: This embodiment provides a 3D printing digital preparation method for the intermaxillary traction tooth surface fixing device in Embodiment 1, including the following steps:

[0038] Step 1: Image acquisition and processing,

[0039] The three-dimensional topography data of the dentition after orthodontics before orthognathic surgery is scanned by an intraoral scanner;

[0040] Among them, the data format may be STL, OBJ, AMF, 3MF or other formats representing three-dimensional topography in a digital manner; or the CBCT or spiral CT with the data format of DICOM, JPG, JPEG, BMP, PNG or GIF is segmented and reconstructed to obtain the three-dimensional topography data of the dentition.

[0041] Step 2: Design of the intermaxillary traction tooth surface fixing device,

[0042] Based on the three-dimensional dental morphology data obtained in Step 1, a dental surface bonding attachment A that fits the labial surfaces of the upper teeth is designed. Between adjacent dental surface bonding attachments A, a connecting rod A that conforms to the curvature of the dental arch is designed. The connecting rod A connects adjacent dental surface bonding attachments, and a traction hook A facing the gingival side is designed on the connecting rod;

[0043] Based on the three-dimensional dental morphology data obtained in Step 1, a dental surface bonding attachment B that fits the labial surfaces of the lower teeth is designed. Between adjacent dental surface bonding attachments B, a connecting rod B that conforms to the curvature of the dental arch is designed. The connecting rod B connects adjacent dental surface bonding attachments, and a traction hook B facing the gingival side is designed on the connecting rod;

[0044] The design software can use Freeform software or other design software.

[0045] Step 3: Use a 3D printing device to print and form the intermaxillary traction dental surface fixing device designed in Step 2. The printing material can be selected from resin materials.

[0046] Example 3: Application of the intermaxillary traction dental surface fixing device of Example 1 in the traction treatment between the upper and lower jaws in the orthognathic treatment plan.

[0047] When there are no orthodontic treatment attachments bonded to the dental surface: Bond the upper dental surface fixing component of the intermaxillary traction dental surface fixing device to the upper dental surface, bond the lower dental surface fixing component of the intermaxillary traction dental surface fixing device to the lower dental surface, use ligature wire to ligate the traction hook A and traction hook B of the upper dental surface fixing component, and perform intermaxillary traction;

[0048] When there are orthodontic treatment attachments bonded to the dental surface: Bond the upper dental surface fixing component of the intermaxillary traction dental surface fixing device to the dental surface between the orthodontic treatment attachment of the upper tooth and the gingival side, bond the lower dental surface fixing component of the intermaxillary traction dental surface fixing device to the dental surface between the orthodontic treatment attachment of the lower tooth and the gingival side, use ligature wire to ligate the traction hook A and traction hook B of the upper dental surface fixing component, and perform intermaxillary traction;

[0049] Alternatively, after avoiding or covering the treatment attachment through the holes or grooves designed on the dental surface bonding attachment A and dental surface bonding attachment B, bond them to the dental surface, and then use ligature wire to ligate the traction hook A and traction hook B of the upper dental surface fixing component to perform intermaxillary traction.

[0050] In this embodiment, the intermaxillary traction tooth surface fixation device of Embodiment 1 is applied to the orthognathic treatment plan. Specifically, it is applied to the traction treatment between the upper and lower jaws after orthognathic surgery, replacing the implantable miniplates in the vestibular sulcus bone of the patient that were previously required for traction treatment between the upper and lower jaws, which is equivalent to developing a new application for this form of structure (adhesive attachment + connecting rod + traction hook). And the intermaxillary traction tooth surface fixation device only requires the patient's intraoral scan data for traction treatment between the upper and lower jaws, without the need for CT data. Moreover, the usage period is short, and it only takes up to one month.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. An intermaxillary traction tooth surface fixing device applied to orthognathic treatment, characterized in that: It includes a maxillary tooth surface fixing component applicable to the maxilla and a mandibular tooth surface fixing component applicable to the mandible; the maxillary tooth surface fixing component includes tooth surface bonding attachments A bonded to the labial tooth surfaces of each tooth in the maxilla, a connecting rod A connecting two adjacent tooth surface bonding attachments A, and further includes a traction hook A extending towards the gingival side and provided on the connecting rod A; the mandibular tooth surface fixing component includes tooth surface bonding attachments B bonded to the labial tooth surfaces of each tooth in the mandible, a connecting rod B connecting two adjacent tooth surface bonding attachments B, and further includes a traction hook B extending towards the gingival side and provided on the connecting rod B.

2. The intermaxillary traction tooth surface fixing device applied to orthognathic treatment according to claim 1, characterized in that: There are multiple tooth surface bonding attachments A, each corresponding to each tooth in the maxilla; there are multiple tooth surface bonding attachments B, each corresponding to each tooth in the mandible.

3. The intermaxillary traction tooth surface fixing device applied to orthognathic treatment according to claim 1, characterized in that: The tooth surface bonding attachments A are connected into one body through the connecting rod A; the tooth surface bonding attachments B are connected into one body through the connecting rod B.

4. The intermaxillary traction tooth surface fixing device applied to orthognathic treatment according to claim 1, characterized in that: All the tooth surface bonding attachments A are divided into two or more regions, and the tooth surface bonding attachments A in each region are connected into one body through the connecting rod A.

5. The intermaxillary traction tooth surface fixing device applied to orthognathic treatment according to claim 1, characterized in that: All the tooth surface bonding attachments B are divided into two or more regions, and the tooth surface bonding attachments B in each region are connected into one body through the connecting rod B.

6. The intermaxillary traction dental surface fixing device applied to orthognathic treatment according to claim 1, wherein: The bonding surfaces of the tooth surface bonding attachments A and the tooth surface bonding attachments B are arcs that fit the shapes of the corresponding tooth surfaces before orthognathic surgery, and the connecting rods A and the connecting rods B are dental arch arcs with the same curvature as the dental arch between the corresponding adjacent tooth surfaces before orthognathic surgery.

7. The intermaxillary traction tooth surface fixing device applied to orthognathic treatment according to claim 1, wherein: A ligature wire for achieving intermaxillary traction of the upper and lower teeth is provided between the traction hook A of the maxillary tooth surface fixing component and the traction hook B of the mandibular tooth surface fixing component.

8. The intermaxillary traction tooth surface fixing device applied to orthognathic treatment according to claim 1, characterized in that: Holes or grooves for avoiding orthodontic attachments bonded to the tooth surfaces are provided on the tooth surface bonding attachments A and / or the tooth surface bonding attachments B.

9. A 3D printing digital preparation method for an intermaxillary traction tooth surface fixing device applied to orthognathic treatment, characterized in that, It includes the following steps: Step 1: Image acquisition and processing, Scanning the three-dimensional topographic data of the dentition after the end of orthodontics before orthognathic surgery through an intraoral scanner; Step 2: Design of the intermaxillary traction tooth surface fixing device, According to the three-dimensional topographic data of the dentition obtained in Step 1, designing tooth surface bonding attachments A that fit the labial tooth surfaces of each tooth in the maxilla, designing a connecting rod A that conforms to the dental arch curvature between adjacent tooth surface bonding attachments A, the connecting rod A connecting adjacent tooth surface bonding attachments, and designing a traction hook A towards the gingival side on the connecting rod; According to the three-dimensional topographic data of the dentition obtained in Step 1, designing tooth surface bonding attachments B that fit the labial tooth surfaces of each tooth in the mandible, designing a connecting rod B that conforms to the dental arch curvature between adjacent tooth surface bonding attachments B, the connecting rod B connecting adjacent tooth surface bonding attachments, and designing a traction hook B towards the gingival side on the connecting rod; Step 3: Printing and forming the intermaxillary traction tooth surface fixing device designed in Step 2 through a 3D printing device.

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