Correcting appliance manufacturing method based on digital visual jaw reconstruction technology

Abstract

The invention relates to the technical field of orthodontic appliances for osteogenic III-type maxillary hypoplasia, in particular to an orthodontic appliance manufacturing method based on a digital visual jaw reconstruction technology, the orthodontic appliance comprises a base and a jaw pad, and the orthodontic appliance manufacturing method comprises the following steps: S1, acquiring patient related data and first oral scanning data, and determining an orthodontic appliance scheme; s2, obtaining a static occlusion state of the patient, determining a preliminary occlusion target position, and obtaining second oral scanning data; s3, the first time of oral scanning data and the second time of oral scanning data are imported into design software, and a digital model is generated; s4, determining a final jaw position through the digital jaw frame; s5, designing a substrate model, and performing 3D printing; s6, designing a jaw pad model, and performing 3D printing; the tissue surface of the appliance manufactured by the method can be perfectly matched with the tooth appearance of a patient, the occlusion record target position better conforms to the biological basis of a human body, the design is more accurate, and the appliance can be effectively prevented from falling off.

Description

Technical Field

[0001] The present invention relates to the technical field of orthodontic appliances for skeletal Class III maxillary hypoplasia, and particularly to a method for manufacturing an orthodontic appliance based on digital visualization of jaw reconstruction technology. Background Art

[0002] In the orthodontic treatment of children and adolescents, during the production of orthodontic appliances using traditional wax occlusion records and plaster models, problems such as deformation of wax occlusion records and inaccurate transfer to the articulator often occur, resulting in the inability to properly seat or poor seating in the clinic. Therefore, a large amount of adjustment and grinding of the orthodontic appliance is required, affecting the orthodontic target position, and even leading to rework of the orthodontic appliance and discomfort for the patient wearing it, thus resulting in the failure of treatment.

[0003] The Chinese patent application with the publication number CN117770992A discloses a digital manufacturing method for an orthodontic removable appliance, including the following steps: Step 1, scanning the oral conditions of the patient to obtain the three-dimensional data of the patient's oral cavity; Step 2, constructing an orthodontic removable appliance model in the STL file format based on the three-dimensional data of the patient's oral cavity. The orthodontic removable appliance model includes a wire component model and a resin base model. The resin base model is evenly divided into two parts in its thickness direction, and the connecting part of each wire component model is jointly embedded after the two resin base models are combined; Step 3, importing the STL file of the wire component model into a wire bending device to complete the automatic bending of each wire component, and importing the STL file of the resin base model into a 3D printer to complete the printing of the two resin bases; Step 4, selecting one resin base, inserting the connecting part of each wire component into the corresponding groove, applying an adhesive on the surface combined with the other resin base, and then bonding the two resin bases. After the bonding is firm, the production of the orthodontic removable appliance is completed. The above disclosed solution uses oral scanning technology to get rid of the dependence on plaster models in traditional methods, and the obtained three-dimensional data model of the oral cavity is more accurate. However, the above disclosed solution does not disclose a specific solution for further improving the manufacturing accuracy of the orthodontic appliance. Summary of the Invention

[0004] Technical Objective: In order to overcome the deficiencies in the prior art, the present invention provides a method for manufacturing an orthodontic appliance based on digital visualization of jaw reconstruction technology.

[0005] Technical Solution: To achieve the above objective, the present invention discloses a method for manufacturing an orthodontic appliance based on digital visualization of jaw reconstruction technology. The orthodontic appliance includes a base and a occlusal pad. The manufacturing of the orthodontic appliance includes the following steps:

[0006] S1: Obtain the facial photos, panoramic tomograms, lateral cephalograms of the patient, and the first oral scan data to determine the orthodontic appliance plan for the patient;

[0007] S2: Obtain the static occlusion state of the patient through occlusion records, determine the preliminary occlusal target position, and perform a second intraoral scan to obtain the second intraoral scan data;

[0008] S3: Import the first intraoral scan data and the second intraoral scan data into the design software in STL format respectively to generate a digital model in the initial state and a digital model in the target state;

[0009] S4: Perform occlusion checks on the digital model in the initial state and the digital model in the target state respectively through a digital articulator, record the occlusion change value, adjust the initial occlusion record position, and determine the final jaw position;

[0010] S5: Design the base model: Determine the common insertion path based on the digital model in the initial state and the digital model in the target state, fill in the undercuts, and design bilateral bands. A connecting body with a traction hook is provided between the bilateral bands. Export the design data in STL format and generate the base using 3D printing technology;

[0011] S6: Design the occlusal splint model: Based on the base model obtained in S5 and the mandibular data in the first intraoral scan data, design the occlusal splint range according to the occlusal opening height and tooth width, determine the tissue surface of the occlusal splint, the tissue surface morphology, and the tissue surface occlusion record. Export the design data in STL format and generate the occlusal splint using 3D printing technology;

[0012] Further, the base material is cobalt-chromium alloy, and the occlusal splint is an anatomic or semi-anatomic occlusal splint, and its material is resin.

[0013] Further, the occlusion change value in step S4 is 4 - 6 mm.

[0014] Further, several polygonal patterns are provided at intervals on the side of the bilateral bands close to the teeth in step S5. The depth of the polygonal patterns is 0.2 mm, the line diameter is 1 mm, and a bonding agent gap of 0.05 - 0.1 mm is also preset on the tissue surface of the bilateral bands close to the teeth.

[0015] Further, when the maxilla of the patient has insufficient transverse development, a screw expansion appliance needs to be added to the connecting body of the base generated in S5, and the base connected with the screw expansion appliance is fixed on the oral model for overlapping scanning. The overlapping scan data is imported into the design software in S3 and fitted with the digital model in the target state. The fitted data is exported in STL format and the final base is generated using 3D printing technology. The oral model is prepared by 3D printing technology based on the digital model in the target state.

[0016] Further, the spiral arch expansion device includes a bracket-type arch expansion screw and a bracket. One end of the bracket is connected to the bracket-type arch expansion screw, and the other end is connected to the connecting body. The number of brackets is four.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. In this method, the dentition and occlusion records of the patient are converted into a digital model in STL format through digital scanning. The orthodontic appliance is designed by software and printed using 3D printing technology. Clinically, after the doctor bonds the base and occlusal pad of the orthodontic appliance, the orthodontic appliance can be worn for the patient. The dual occlusion record matching design is adopted for production, and the target position of the occlusion record is more in line with the human biological basis. The design based on the data of the digital articulator is more accurate, and the tissue surface of the orthodontic appliance can perfectly match the tooth shape of the patient, increasing the retention of the orthodontic appliance and preventing the orthodontic appliance from falling off.

[0019] 2. The production with a standardized process reduces the problems of the orthodontic appliance not fitting well and the occlusion record being inaccurate caused by factors in the dental technician production.

[0020] 3. For the situation of insufficient transverse development of the jaw bone, clinically, an arch expansion device can be added according to the treatment needs to assist in loading force on the orthodontic appliance. At the same time, the metal base can provide good support and strength for the orthodontic appliance, achieving a better treatment goal. The occlusal pad is made of resin material, which can effectively prevent the deformation of the occlusal pad body during the development of the maxilla and can accurately restrict the jaw position of the patient. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the bilateral band design in the present invention;

[0022] Figure 2 It is a schematic diagram of the traction hook design in the present invention;

[0023] Figure 3 It is a schematic diagram of the overlapping scan data model in the present invention;

[0024] Figure 4 It is a schematic diagram of the fitting of the overlapping scan data model and the target state digital model in the present invention;

[0025] Figure 5 It is a schematic diagram of the occlusal pad design in the present invention;

[0026] Figure 6 It is a schematic diagram of the tissue surface morphology of the occlusal pad in the present invention;

[0027] Figure 7 It is a schematic diagram of determining the occlusion relationship using a digital articulator in the present invention;

[0028] Figure 8Stereogram of the base with a screw expansion device in the present invention;

[0029] Figure 9 Schematic diagram of the assembly of the base and the occlusal pad in the present invention. Detailed implementation manners

[0030] The following Figure 1 —appendix Figure 9 describes the principles and features of the present invention. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0031] A method for manufacturing an orthodontic appliance based on digital visualization jaw position reconstruction technology, as Figure 1 — Figure 7 shown. The orthodontic appliance includes a base and an occlusal pad bonded together. The orthodontic appliance is mainly for adolescent patients with skeletal Class III maxillary hypoplasia and acts on the maxilla of the patient. The orthodontic appliance is designed by design software and printed by 3D printing technology. The manufacturing of the orthodontic appliance includes the following steps:

[0032] S1: Obtain the facial photos, panoramic tomograms, lateral cephalograms and the first oral scan data of the patient, conduct data analysis, and determine the orthodontic appliance plan for the patient. The orthodontic appliance plan includes the treatment plan of the patient and the selected orthodontic appliance.

[0033] S2: Record the occlusal condition of the patient, obtain the static occlusal state of the patient through occlusal record, determine the preliminary occlusal target position, and conduct the second oral scan according to the preliminary occlusal target position to obtain the second oral scan data.

[0034] S3: Import the first oral scan data and the second oral scan data into the design software in STL format respectively to generate an initial state digital model and a target state digital model; in this embodiment, the design software is specifically the Weishi wire retainer. After the first oral scan data and the second oral scan data are imported, select "Prepare Model" in the function option, and determine the coordinate system by setting the occlusal plane and the sagittal plane of the model.

[0035] S4: Use the digital articulator to perform occlusal examinations on the digital models in the initial state and the target state respectively, record the occlusal change values, and adjust the initial occlusal record position to determine the final jaw position. Specifically, after digitally segmenting the digital model, import it into the design software. Use the "articulator function" in the design software to select the digital articulator, set the Bennett angle, condylar guidance, and inclined guidance for the height of the incisal guide pin, simulate the movement with the incisal guide plate as the guide, and perform occlusal examinations such as protrusion and lateral movement on the digital articulator. Match the jaw position changes in the first intraoral scan data and the second intraoral scan data through the data in the digital articulator, and compare to obtain the occlusal record change. The range of the occlusal change value is 4 - 6 mm. Evaluate the occlusal record through the digital articulator, and appropriately adjust the initial occlusal record position through simulating protrusion and lateral occlusal positions.

[0036] S5: Design the base model: Through the "model observation" function, determine the common path of insertion based on the digital models in the initial state and the target state, and on this basis, fill in the undercuts to facilitate smooth insertion into the patient's mouth. Design bilateral bands, set a connector between the bilateral bands, and add a traction hook for forward traction on the connector.

[0037] As Figure 8 shown, in order to further increase the bonding strength between the bilateral bands and the teeth and prevent detachment, a number of polygonal patterns are spaced on the tissue surface of the bilateral bands close to the teeth. The depth of the polygonal patterns is 0.2 mm, the line diameter is 1 mm, and a bonding agent gap of 0.05 - 0.1 mm is also preset on the tissue surface of the bilateral bands close to the teeth. In this embodiment, the polygonal pattern is a standard hexagon. After the base design is completed, export the design data in STL format and generate the base through 3D printing technology. In this embodiment, the base material is cobalt-chromium alloy, which can provide good support and strength for the orthodontic appliance.

[0038] Furthermore, if the patient has insufficient transverse development of the maxilla, a screw expansion device needs to be further added to the connector of the base generated in the above S5. Conversely, if the patient does not have insufficient transverse development of the maxilla, then there is no need to add a screw expansion device. Specifically, in this embodiment, the screw expansion device includes a bracket-type expansion screw and a bracket. One end of the bracket is connected to the bracket-type expansion screw, and the other end is connected to the connector. The number of brackets is four, which are arranged in two on both sides of the oral cavity. The contact between the bracket and the connector can be achieved by adjusting the bracket-type expansion screw. Fix the base generated through 3D printing technology on the oral model, and the oral model is generated through 3D printing technology based on the digital model in the target state. Adjust the position of the bracket through the bracket-type expansion screw, and weld and fix the bracket on the connector of the base generated in the above S5 to make it an integral whole. To ensure smoothness, grinding and polishing treatments are required after welding.

[0039] Fix the base connected with the screw expansion device on the oral model, spray a layer of light-shielding powder, and send it into the model scanner for overlapping scanning. Import the overlapping scanning data into the design software of S3 in a pre-prepared form. Use the N-point alignment function to fit the overlapping scanning data with the digital model in the target state. Both use the same coordinate system. Export the fitted data in STL format and use 3D printing technology to generate the final base. Clinically, the screw expansion device can be adjusted according to the treatment needs to apply force to the orthodontic appliance.

[0040] S6: Design the occlusal pad model: Import the base model obtained in S5 and the mandibular data in the first oral scan data into the design software. Design the occlusal pad range based on the occlusal opening height and tooth width. Obtain the contours of the final base and the opposing teeth through Boolean operations. Determine the tissue surface of the occlusal pad based on the digital articulator, and at the same time use 3D carving technology to determine the tissue surface morphology. Determine the occlusal record of the final tissue surface of the occlusal pad through the data in the digital articulator for protrusive and lateral occlusion records to complete the occlusal pad design. Export the design data in STL format and use 3D printing technology to generate the occlusal pad. In this embodiment, the occlusal pad is an anatomical or semi-anatomical occlusal pad, and its material is resin. The occlusal pad made of resin can avoid the deformation of the occlusal pad body caused by the development of the maxilla compared with the traditional silicone material, ensuring the use effect of the orthodontic appliance.

[0041] As Figure 9 shown, after the doctor clinically bonds the orthodontic appliance, the orthodontic appliance can be worn for the patient. The tissue surface of the orthodontic appliance can perfectly match the tooth shape of the patient. It is designed by using double occlusal record matching. The target position of the occlusal record is more in line with the human biological basis. The design based on the data of the digital articulator is more accurate, and the orthodontic appliance can be effectively prevented from falling off.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for manufacturing an appliance based on digital visualization jaw reconstruction technology, characterized in that: The appliance comprises a base and a jaw pad, and the manufacture of the appliance comprises the following steps: S1: Obtain the patient's facial photograph, curved body layer film, lateral head film and the first oral scan data to determine the patient's orthodontic appliance plan; S2: Obtain the patient's static occlusal state through the occlusal record, determine the preliminary occlusal target position, and perform a second mouth scan to obtain the second mouth scan data; S3: importing the first oral scan data and the second oral scan data into the design software in STL format to generate an initial state digital model and a target state digital model; S4: performing an occlusal check on the initial state digital model and the target state digital model respectively through a digital jaw frame, recording an occlusal change value, adjusting an initial occlusal recording position, and determining a final jaw position; S5: Designing a base model: determining a common positioning path according to the initial state digital model and the target state digital model, filling the undercut and designing double-sided belt loops, wherein a connector with a traction hook is provided between the double-sided belt loops, exporting the design data in STL format, and generating a base using 3D printing technology; S6: Designing a jaw pad model: Based on the base model obtained in S5 and the mandibular data in the first oral scan data, design the jaw pad range according to the bite opening height and the tooth width, determine the jaw pad tissue surface, tissue surface morphology and tissue surface occlusion record, export the design data in STL format, and generate the jaw pad using 3D printing technology.

2. The method for manufacturing an orthodontic appliance based on digital visualization jaw reconstruction technology according to claim 1, characterized in that: The base material is cobalt-chromium alloy, and the jaw pad is an anatomical or semi-anatomical jaw pad, which is made of resin.

3. The method for manufacturing an orthodontic appliance based on digital visualization jaw reconstruction technology according to claim 1, characterized in that: The bite change value in step S4 is 4 to 6 mm.

4. The method for manufacturing an orthodontic appliance based on digital visualization jaw reconstruction technology according to claim 1, characterized in that: In step S5, the bilateral band ring is provided with a plurality of polygonal patterns at intervals on the side close to the teeth. The polygonal patterns are engraved with a depth of 0.2 mm and a line diameter of 1 mm. The bilateral band ring is also preset with a 0.05-0.1 mm adhesive gap on the tissue surface close to the teeth.

5. The method for manufacturing an orthodontic appliance based on digital visualization jaw reconstruction technology according to claim 1, characterized in that: If the patient's maxillary bone is not developed transversely, a spiral expander is required to be added to the connector of the base generated by S5, and the base connected with the spiral expander is fixed on the oral model for overlapping scanning. The overlapping scanning data is imported into the design software of S3 and fitted with the target state digital model. The fitting data is exported in STL format, and the final base is generated by 3D printing technology. The oral model is prepared by 3D printing technology based on the target state digital model.

6. The method for manufacturing an orthodontic appliance based on digital visualization jaw reconstruction technology according to claim 5, characterized in that: The spiral expansion device comprises a bracket-type expansion screw and a bracket, one end of the bracket is connected to the bracket-type expansion screw, and the other end of the bracket is connected to a connector, and the number of the brackets is four.

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