Manufacturing method of digital customized preformed crown and bridge prosthesis

Abstract

The invention relates to the technical field of dental restoration, and discloses a digital customized preformed crown and bridge restoration manufacturing method, which comprises the following operation steps: S10, data import and preprocessing: establishing an order in 3shape software, importing high-quality intraoral scanning data, preprocessing the scanning data to ensure the accuracy and integrity of the data, and storing the data in a database; a basis is provided for subsequent design; and S20, performing virtual tooth extraction and accurate design: performing virtual tooth extraction operation, ensuring that the adjacent surface and the root are smooth after tooth extraction, avoiding excessive repair or false repair, accurately repairing the edge line and the adjacent surface of the digital customized preformed prosthesis by referring to original working mold data, and performing back-cutting according to a target form before restoring a virtual prepared abutment form. According to the manufacturing method of the digitally customized preformed crown and bridge prosthesis, the problems that the existing finished preformed crown is single in variety, natural and inconsistent in appearance and color with the interior of the mouth, the precision is low, and the prosthesis is not matched with the abutment in position are solved.

Description

Technical Field

[0001] The invention relates to the technical field of oral restoration, and in particular to a method for manufacturing a digital customized prefabricated crown and bridge restoration. Background Art

[0002] In recent years, the introduction of digital technology, especially CAD / CAM (computer-aided design and computer-aided manufacturing) technology, has brought revolutionary changes to the field of oral restoration. CAD / CAM technology obtains three-dimensional data of the patient's mouth through high-precision scanning, then uses computer software to design the restoration, and finally uses CNC machine tools to perform precise processing and manufacturing. This process has greatly improved the production efficiency and accuracy of the restoration, reduced the interference of human factors, and made the production of the restoration more standardized and process-oriented.

[0003] Although digital technology can obtain high-precision oral three-dimensional data, the limitations of software algorithms and differences in doctors' proficiency may lead to slight deviations in the shape, size and fit of restorations. These deviations may be magnified during the production and installation process, affecting the restoration effect and patient experience. For example, slight size deviations may cause poor contact between the restoration and adjacent teeth or gums, thereby affecting stability and comfort. At the same time, the patient's oral environment is complex and there are large individual differences. Even if a restoration is designed perfectly in theory, it may not match the installation angle, force, oral tissue changes and other factors in actual operation. This mismatch affects the retention effect and may also cause unattractive personalized aesthetics, making the overall restoration difficult to operate. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of low design accuracy and mismatch between the restoration and the abutment in the existing digital design and production process, and to propose a method for producing a digital customized prefabricated crown and bridge restoration.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A method for manufacturing a digital customized prefabricated crown and bridge restoration comprises the following steps:

[0007] S10, data import and order creation: Create an order in 3shape software, design the virtual prepared abutment shape according to the order design process, import high-quality intraoral scan data, pre-process the scan data to ensure the accuracy and completeness of the data, and provide a basis for subsequent design;

[0008] S20, Virtual Tooth Extraction and Precise Design: Perform virtual tooth extraction to ensure that the adjacent surfaces and roots are flat after tooth extraction, avoid over-repair or wrong repair, refer to the original scanned working model data, accurately repair the edge line and adjacent surface of the digital customized prefabricated restoration, and cut back according to the target shape before restoring the virtual prepared abutment shape. According to the clinical requirements of the final restoration material for the restoration space, the thickness of the tooth tissue to be removed is accurately controlled by the compensation value;

[0009] S30, copy and modify the order: Use the "Copy CAD design and attach it to the prepared scan" function in the order copy to copy the order completed in step S20. The purpose of this copying process is to copy the order with the designed virtual prepared abutment shape and transform it into a working model order that can be recognized by the software and contains virtual prepared abutments, so that after changing the restoration type of this order to an anatomical crown, a digital customized prefabricated crown and bridge restoration can be designed;

[0010] S40, Design parameter setting and shape correction: Adjust the direction of the insertion path according to the design requirements, draw the edge line of the digital customized prefabricated crown and bridge restoration, set the design parameters according to the selected material, ensure the strength and aesthetics of the restoration, and make comprehensive corrections to the restoration shape, including the design of the labial surface, mesial surface, lingual side, distal surface and tissue surface to meet personalized needs;

[0011] S50. Design of auxiliary positioning device and observation window: On the basis of designing digital customized crown and bridge restoration, auxiliary positioning device and observation window are added, relevant thickness parameters are designed according to material characteristics to ensure the stability and functionality of the auxiliary device, the shape of the retention device is trimmed, and the positioning observation window is set in the accessory tool to facilitate the subsequent trial wearing and precise adjustment during bonding;

[0012] S60, Manufacturing and Verification: Export the designed digital customized crown and bridge restoration data to the CAD / CAM system for manufacturing, and verify the manufactured restoration to ensure that it is consistent with the design requirements and meets clinical use needs.

[0013] Based on the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, the step S10 specifically includes the following steps:

[0015] S101, start 3shape software and create an order: open 3shape software, create a new order in the software interface, select the base crown and anatomical inner crown according to the actual tooth position requirements, and prepare for the next design task;

[0016] S102. Import high-quality intraoral scan data: Use the formats supported by 3shape software, such as 3OXZ, DCM, etc. to import high-quality intraoral scan data into the software. During the import process, ensure the integrity and accuracy of the data to avoid data loss or damage;

[0017] S103, data preprocessing: perform a preliminary check on the imported scan data to remove possible noise, redundant points or outliers. If the scan data contains multiple parts such as upper and lower jaws, these parts need to be aligned to ensure their correct positions in the three-dimensional space. For the missing or damaged parts that may exist in the scan data, use the tools provided by the 3shape software to repair or fill them. According to the design requirements, the scan data is further optimized, such as smoothing the surface, adjusting the resolution, etc.;

[0018] S104, Data Verification: After completing data preprocessing, use the verification tool provided by 3shape software to check the processed data to ensure the accuracy, completeness and consistency of the data, providing a reliable basis for subsequent design;

[0019] S105. Save the preprocessed data: Save the preprocessed data to a specified location so that it can be called at any time in the subsequent design process. At the same time, a backup can also be created for the data to prevent data loss or damage.

[0020] Furthermore, when processing the scan data in step S103, if the data contains color information such as tooth color, color calibration is required, which can ensure that the color information in the data is accurate and consistent, and provide a basis for subsequent color matching and design. Color calibration usually requires the use of the calibration tool provided by the 3shape software and follows the software's operating instructions. If the scan data contains complete upper and lower jaw models and further tooth segmentation processing is required, the segmentation tool provided by the 3shape software can be used, which helps to extract each tooth separately for more accurate design and analysis. During the segmentation process, the segmentation parameters and boundaries need to be carefully adjusted to ensure the accuracy and completeness of the segmentation results. In order to ensure the comparability and consistency between different scan data, the data can be standardized, which includes unifying the data's coordinate system, scaling, and resolution. Through standardization, scan data from different sources and formats can be compared and analyzed on the same platform.

[0021] Furthermore, in step S104, after completing the data preprocessing, the model needs to be subjected to a comprehensive quality check, which includes checking the integrity, surface smoothness, resolution and accuracy of the model. Through the quality check, possible problems can be discovered and corrected in time to ensure the accuracy and reliability of the model. If the scanned data contains upper and lower jaw models, it is necessary to verify whether the occlusal relationship between them is correct, which can be achieved by aligning the upper and lower jaw models and checking the contact area and position between them. The accuracy of the occlusal relationship is crucial for subsequent design and treatment. Before using the data for subsequent design, the compatibility of the data needs to be checked, which includes checking whether the data format is compatible with the design software and whether the data contains all the necessary information and parameters. Through the compatibility check, it can be ensured that the data can be correctly loaded and processed in the design software.

[0022] Furthermore, the step S20 specifically includes the following steps:

[0023] S201. Virtual tooth extraction operation: In the interface of 3shape software, import the intraoral scan data that has been preprocessed and verified to be correct. In the toolbar of 3shape software, find and select the precise selection and cutting tool for virtual tooth extraction. This tool allows users to simulate the real tooth extraction process by specifying the area and depth of tooth extraction. According to the treatment plan, use the tooth extraction tool to accurately define the tooth area to be extracted on the 3D model. At the same time, accurate cutting lines should be drawn on the crown and root of the tooth to ensure that the adjacent surface and root are flat after tooth extraction to avoid unnecessary damage to the surrounding teeth. After confirming the tooth extraction area, click the button to execute the tooth extraction operation. 3shape software will simulate the tooth extraction process and remove the specified tooth part according to the user-defined cutting line. After the tooth extraction operation is completed, use the software's viewing tool to carefully check the tooth extraction area to ensure that the adjacent surface and root are flat, and there is no over-repair or mis-repair. If any problems are found, you can use the editing tool to make fine adjustments.

[0024] S202. Accurately design the restoration margins and adjacent surfaces: Use the comparison tool of the 3shape software to compare the model after tooth extraction with the original working model data. This helps to ensure the accuracy of the tooth extraction operation and serves as a reference for the subsequent design of the restoration. Based on the comparison results, use the software's editing tools to draw precise contours on the 3D model. These contours will serve as the basis for the margins and adjacent surfaces of the digital customized prefabricated restoration. During the drawing process, it is necessary to ensure the fit of the restoration to the surrounding teeth to avoid excessive gaps or overlaps. Before restoring the virtual prepared abutment shape, perform a backcut operation based on the target shape. This usually involves making minor adjustments to the margins and adjacent surfaces of the restoration to ensure that the restoration fits the abutment perfectly when it is finally installed, while maintaining an appropriate gap to accommodate the restoration material.

[0025] S203. Adjusting the thickness of tooth tissue and optimizing restorations: Based on the clinical requirements of the final restoration material for the restoration space, use the measurement and adjustment tools of the 3shape software to accurately adjust the thickness of the tooth tissue to be removed. This involves measuring and adjusting the thickness inside the restoration on a three-dimensional model to ensure that the strength and stability of the restoration meet clinical requirements. After completing the above steps, perform a final inspection and optimization of the restoration, which includes checking the shape, size, fit of the margins and adjacent surfaces of the restoration, and ensuring that there are no unnecessary gaps or defects inside the restoration. If any problems are found, the editing tools can be used for further adjustment and optimization.

[0026] Furthermore, the step S30 specifically includes the following steps:

[0027] S301. Open 3shape software and locate the order management interface: First, start 3shape software and ensure that the software version is the latest so that all functions and optimizations can be used. Find and click "Order Management" or an icon with similar functions in the main interface of the software to enter the order management interface;

[0028] S302. Select and copy the completed S20 order: In the order list, find and select the order that has completed S20, right-click the selected order, or click the "Action" button next to the order, and select the option "Copy the CAD design and attach it to the prepared scan". The system will prompt you to confirm the copy operation, click "Confirm" or a similar button to copy;

[0029] S303, confirm the copied order information: after the copying is completed, the software will automatically generate a new order, which will contain the CAD design of the original order and the attached preparation scans. Check the details of the new order to ensure that the CAD design and preparation scans are correctly attached;

[0030] S304, converting the new order into a working model order with virtual prepared abutments: in the editing interface of the new order, find "restoration type" or similar options, and select "anatomical crown" or similar options from the drop-down menu to convert the order into a working model order with virtual prepared abutments. The system may prompt some automatic adjustments or confirmations, and you can operate according to the prompts;

[0031] S305. Adjust design parameters to match the requirements of the digital customized prefabricated crown and bridge restoration: According to the design requirements of the digital customized prefabricated crown and bridge restoration, adjust design parameters such as material, thickness, color, etc. to ensure that these parameters match the patient's oral condition and clinical needs;

[0032] S306. Save and preview the modified order: After completing all necessary adjustments, click the "Save" button to save the modified order, and use the preview function of the software to view the effect of the modified order to ensure that the design meets the requirements;

[0033] S307, prepare to enter the next design process: Now, the order is ready to enter the next design process, that is, designing the specific shape and structure of the digital customized prefabricated crown and bridge restoration. This step can be completed by using various design tools and functions provided by 3shape software as needed.

[0034] Furthermore, the step S40 specifically includes the following steps:

[0035] S401, adjust the insertion path and draw the margin line: open the converted working model order containing the virtual prepared abutment in the 3shape software, and use the tools in the software to adjust the insertion path direction according to the patient's oral condition and clinical needs, and fine-tune the installation position of the restoration to ensure its stability and functionality in the mouth, verify the correctness of the insertion path direction, and ensure that the restoration can be smoothly placed in place during the installation process. In the software, use the margin line drawing tool to accurately draw the margin line of the restoration according to the design requirements and the form of the working model, ensure that the margin line is smooth and continuous, and coordinated with the surrounding teeth and gingival tissues, verify the position and shape of the margin line, and ensure that it meets clinical requirements and aesthetic standards;

[0036] S402, setting design parameters and correcting appearance: according to the physical properties of the selected materials and clinical requirements, set the corresponding design parameters in the software, including key indicators such as thickness, strength, hardness, and wear resistance of the restoration. When setting, it is necessary to ensure that the restoration has sufficient strength and stability while meeting the aesthetic requirements. Use the editing tools of the software to finely design the labial surface of the restoration to ensure its coordination and aesthetics with the surrounding teeth. Similarly, finely design the mesial surface, lingual side, and distal surface of the restoration to ensure their adaptability and coordination with the surrounding teeth. According to the specific conditions of the patient and clinical requirements, the tissue surface of the restoration is precisely designed, including adjusting the contact relationship and morphology between the restoration and tissues such as the gums and alveolar bones;

[0037] S403, Verification and Adjustment: After completing the preliminary design, use the software's verification tools to conduct a comprehensive verification of the restoration, which includes checking the shape, size, fit of the margins and adjacent surfaces of the restoration, and ensuring that there are no unnecessary gaps or defects inside the restoration. If any problems are found, use the editing tools for further adjustment and optimization. During the verification process, special attention should be paid to the fit of the restoration with the surrounding teeth and tissues, as well as the integrity and uniformity of the restoration. Any problems found should be adjusted and optimized in a timely manner to ensure the design accuracy and completeness of the restoration.

[0038] Furthermore, in step S401, when adjusting the direction of the insertion path, in addition to using the rotation, translation and scaling tools of the software, fine-tuning can also be performed in combination with the patient's intraoral scan data or intraoral photos to ensure that the insertion direction of the restoration is highly matched with the patient's actual oral condition. When drawing the edge line of the restoration, the software's automatic fitting function or manual adjustment tool is used to smooth the edge line to reduce the difficulty and error in later processing. After the edge line is drawn, the software's inspection tool is used to verify the continuity and accuracy of the edge line to ensure that there is no breakage or dislocation. When setting the design parameters in step S402, the relevant properties are imported into the design software according to the physical properties of the selected material, such as elastic modulus, thermal expansion coefficient, etc., so as to more accurately simulate the performance of the restoration. When correcting the shape of the restoration, in addition to the labial surface, mesial surface, and lingual surface, the following are some of the properties of the material: In addition to fine design of the lateral and distal surfaces, you can also consider adding slight texture or color changes to increase the naturalness and aesthetics of the restoration. When designing the tissue surface of the restoration, use the simulation function of the software to dynamically adjust the contact relationship between the restoration and tissues such as the gums and alveolar bone to ensure that the restoration can maintain good stability and adaptability after installation. In step S403, after completing the preliminary design, use the simulation installation function of the software to virtually install the restoration in the patient's oral model to check its fit and coordination with the surrounding teeth and tissues. In addition to checking the external shape and edge fit of the restoration, it is also necessary to check the internal structure of the restoration such as connection holes, retention grooves, etc. to ensure their accuracy and functionality. During the verification process, the restoration is observed and inspected from different angles to ensure its fit and aesthetics in all directions.

[0039] Furthermore, the step S50 specifically includes the following steps:

[0040] S501. Analysis of design requirements and material evaluation: Conduct in-depth research on the materials selected for digital customized crown and bridge restorations to understand their physical properties such as hardness, toughness, wear resistance, and chemical stability. These properties will directly affect the design parameters of auxiliary positioning devices and observation windows, such as thickness and strength. According to the structural characteristics, size, position of the restoration and the patient's oral condition, we determine the type of auxiliary positioning devices that need to be added, such as guides, positioning pins or support frames. At the same time, we will also determine the location of the observation window at the appropriate position of the restoration, so that the adaptation of the restoration and the surrounding tissue can be clearly observed during the subsequent trial wearing and bonding process;

[0041] S502. Design of auxiliary positioning device: Using design software, we draw preliminary design sketches according to the determined auxiliary device type. These sketches will include key information such as the shape, size and position of the device. According to the material properties and design requirements, we set appropriate parameters for the auxiliary device, such as thickness, strength, toughness, etc. These parameters will ensure the stability and functionality of the device while reducing interference with oral tissues. Using the simulation function of the software, we optimize the structure of the auxiliary device. By adjusting the shape, size and position of the device, we ensure that it is easy to install and disassemble while reducing interference with oral tissues.

[0042] S503. Design the observation window and trim the retention device: Based on the determined position and size, use the design software to draw the outline of the observation window. Then, we set appropriate parameters for the observation window according to the material properties and design requirements, such as transparency, thickness, strength, etc. These parameters will ensure that the observation window can meet the observation requirements and have good durability. According to the design of the auxiliary positioning device and the observation window, we adjust the shape and size of the retention device of the restoration. By optimizing the shape and size of the retention device, we ensure that it can provide sufficient retention force while avoiding unnecessary damage to the oral tissue;

[0043] S504. Set the observation window in place and save and output the file: In the accessory tool, we add observation window marks to the restoration. These marks will help us accurately identify and open the observation window during the subsequent production and installation process. Then, we use the verification function of the software to verify the opening position and size of the observation window to ensure that it can meet the observation requirements. After completing the design, we save the restoration file in an editable format for subsequent modification and optimization. Then, according to the requirements of the production equipment, we convert the design file into an appropriate format and output it to the production equipment for subsequent processing and production.

[0044] Furthermore, in step S501, a comprehensive analysis of the patient's oral environment is performed, including tooth arrangement, occlusion, gum condition, etc., so as to more accurately determine the design requirements of the auxiliary positioning device and the observation window. In step S502, when designing the auxiliary positioning device, its compatibility with other oral treatments or restorations should be ensured to avoid mutual interference. Mechanical analysis software is used to perform mechanical simulation of the auxiliary device to evaluate its stability and durability in the oral environment. In step S503, when designing the observation window, its field of view should be ensured to be large enough so that the doctor can clearly observe the fit between the restoration and the surrounding tissue. The details of the retention device are optimized, such as edge processing, chamfer design, etc., to reduce stimulation and damage to oral tissue. In step S504, auxiliary marks are added to the restoration, such as positioning points, alignment lines, etc., to help the doctor more accurately position and adjust the restoration during subsequent production and installation. Before outputting the design file, a file quality check is performed to ensure that the file is complete, accurate and error-free for subsequent processing and production.

[0045] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0046] This method uses 3shape software to establish an order and import high-quality intraoral scan data to ensure the accuracy and completeness of the data. This step effectively avoids subsequent design deviations caused by data quality issues and lays a solid foundation for the entire production process. Compared with the limitations of traditional manual production methods that rely on the doctor's personal experience and manual skills, digital technology provides higher accuracy and repeatability at this stage. Secondly, through virtual tooth extraction operations, the adjacent surfaces and roots after tooth extraction are ensured to be flat, avoiding the problem of multiple repairs or wrong repairs. At the same time, with reference to the original working model data, the edge lines and adjacent surfaces of the digital customized prefabricated restorations are accurately repaired. This step further improves the adaptability and accuracy of the restoration. In addition, according to the requirements of the final clinical restoration material for the restoration space, the thickness of the tooth tissue to be removed is accurately adjusted by compensating values ​​to ensure the production accuracy and functionality of the restoration. The direction of the insertion path is adjusted according to the design requirements, and the edge lines of the digital customized prefabricated crown and bridge restorations are drawn. At the same time, the design parameters are set according to the selected material to ensure The strength and aesthetics of the restoration are improved, and the appearance of the restoration is comprehensively revised, including the design of the labial surface, mesial surface, lingual side, distal surface and tissue surface, to meet the patient's personalized needs. This step not only improves the aesthetics of the restoration, but also enhances its comfort and functionality in clinical use. Auxiliary positioning devices and observation windows are added to ensure the stability and functionality of the auxiliary devices. At the same time, the appearance of the retention device is trimmed, and a positioning observation window is set in the accessory tool to facilitate subsequent trial wearing and precise adjustment during bonding. This step effectively solves the problem of mismatched restoration positioning in the prior art and improves the stability and functionality of the restoration. The designed digital customized crown and bridge restoration data is exported to the CAD / CAM system for manufacturing, and the manufactured restoration is verified. This step ensures that the restoration is consistent with the design requirements and meets clinical use needs. Compared with traditional manual production methods, digital technology provides higher accuracy and efficiency in the manufacturing stage, reduces the interference of human factors, and makes the production of restorations more standardized and process-oriented. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A method flow chart of a method for manufacturing a digital customized prefabricated crown and bridge restoration according to the present invention;

[0048] Figure 2 The external design drawing of the digital customized crown and bridge restoration of the present invention;

[0049] Figure 3 This is a schematic diagram of the appearance of the trimming and retaining device of the present invention;

[0050] Figure 4 It is a schematic diagram of the labial view of the digital customized prefabricated crown and bridge restoration with an auxiliary retention device of the present invention;

[0051] Figure 5 A mesial schematic diagram of a digital customized prefabricated crown and bridge restoration with an auxiliary retention device according to the present invention;

[0052] Figure 6 It is a distal schematic diagram of a digital customized prefabricated crown and bridge restoration with an auxiliary retention device of the present invention;

[0053] Figure 7 This is a schematic diagram of the lip surface of the finished product designed by the present invention;

[0054] Figure 8 It is a schematic diagram of the lingual and palatal view of the digital customized prefabricated crown and bridge restoration with auxiliary retention device of the present invention;

[0055] Fig. 9 This is a schematic diagram of the mid-view of the finished product designed by the present invention;

[0056] Fig.10 This is a schematic diagram of the tissue surface view of a digital customized prefabricated crown and bridge restoration with an auxiliary retention device of the present invention;

[0057] Fig.11 This is a schematic diagram of the side view of the finished tongue designed by the present invention;

[0058] Fig.12 This is a schematic diagram of the distal view of the finished product designed by the present invention;

[0059] Fig.13 This is a schematic diagram of the distal view of the finished product designed by the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] Combination Figures 1 to 13 As shown, a method for making a digital customized prefabricated crown and bridge restoration of the present invention comprises the following steps:

[0062] S10, data import and order creation: Create an order in 3shape software, design the virtual prepared abutment shape according to the order design process, import high-quality intraoral scan data, pre-process the scan data to ensure the accuracy and completeness of the data, and provide a basis for subsequent design;

[0063] Step S10 specifically includes the following steps:

[0064] S101, start 3shape software and create an order: open 3shape software, create a new order in the software interface, select the base crown and anatomical inner crown according to the actual tooth position requirements, and prepare for the next design task;

[0065] S102. Import high-quality intraoral scan data: Use the formats supported by 3shape software, such as 3OXZ, DCM, etc. to import high-quality intraoral scan data into the software. During the import process, ensure the integrity and accuracy of the data to avoid data loss or damage;

[0066] S103, data preprocessing: perform a preliminary check on the imported scan data to remove possible noise, redundant points or outliers. If the scan data contains multiple parts such as upper and lower jaws, these parts need to be aligned to ensure their correct positions in the three-dimensional space. For the missing or damaged parts that may exist in the scan data, use the tools provided by the 3shape software to repair or fill them. According to the design requirements, the scan data is further optimized, such as smoothing the surface, adjusting the resolution, etc.;

[0067] S104, Data Verification: After completing data preprocessing, use the verification tool provided by 3shape software to check the processed data to ensure the accuracy, completeness and consistency of the data, providing a reliable basis for subsequent design;

[0068] S105. Save the preprocessed data: Save the preprocessed data to a specified location so that it can be called at any time in the subsequent design process. At the same time, a backup can also be created for the data to prevent data loss or damage.

[0069] When starting the 3shape software and establishing an order, this step ensures that the design task has a clear and standardized starting point, and provides an orderly environment for subsequent data import and processing. By selecting or creating a new order template, customized design can be performed according to actual needs, which improves the flexibility and efficiency of the design. When importing high-quality intraoral scan data, this step emphasizes the support of data formats, data integrity and accuracy, and avoids the risk of data loss or damage. High-quality intraoral scan data is the basis for subsequent design, and its accuracy and integrity are crucial to the fit and functionality of the restoration. In the data preprocessing stage, this step performs preliminary inspections, removes noise, aligns multiple parts, and repairs or fills in missing parts. or damaged parts and further optimization processing ensure the accuracy and availability of the scanned data. These operations not only improve the accuracy of the data, but also provide a more reliable basis for subsequent design. The data verification step is to conduct a comprehensive check on the preprocessed data to ensure the accuracy, completeness and consistency of the data. This step is an important supplement to data preprocessing, which further enhances the reliability and stability of the data and provides a more solid guarantee for subsequent design. Finally, when saving the preprocessed data (S105), this step ensures the accessibility and security of the data. By saving the data to a specified location and creating a backup, data loss or damage can be prevented, providing continuous support for the subsequent design process.

[0070] In step S103, when processing the scan data, if the data contains color information such as tooth color, color calibration is required, which can ensure that the color information in the data is accurate and consistent, and provide a basis for subsequent color matching and design. Color calibration usually requires the use of the calibration tool provided by the 3shape software and follows the software's operating instructions. If the scan data contains complete upper and lower jaw models and further tooth segmentation processing is required, the segmentation tool provided by the 3shape software can be used, which helps to extract each tooth separately for more accurate design and analysis. During the segmentation process, the segmentation parameters and boundaries need to be carefully adjusted to ensure the accuracy and completeness of the segmentation results. In order to ensure the comparability and consistency between different scan data, the data can be standardized, which includes unifying the data's coordinate system, scaling, and resolution. Through standardization, scan data from different sources and formats can be compared and analyzed on the same platform.

[0071] More detailed and precise technical guidance is provided for processing scan data. First, when processing scan data containing color information, the importance of color calibration is emphasized, and it is pointed out that the calibration tool provided by 3shape software should be used. Color calibration can ensure that the color information in the data is accurate and consistent, providing a reliable basis for subsequent color matching and design. This step effectively solves the problem of inaccurate and inconsistent colors in traditional methods, and improves the aesthetics of the restoration and patient satisfaction. Secondly, for scan data containing complete upper and lower jaw models, a method of using the segmentation tool provided by 3shape software to perform tooth segmentation processing is proposed. By carefully adjusting the segmentation parameters and boundaries, the accuracy and completeness of the segmentation results can be ensured. This step not only improves the accuracy of the design, but also provides more detailed data support for subsequent tooth analysis and restoration. In addition, in order to ensure the comparability and consistency between different scan data, a method for standardizing the data is also proposed. By unifying the coordinate system, scaling and resolution of the data, scan data from different sources and formats can be compared and analyzed on the same platform. This step effectively solves the problem of incomparable and inconsistent data in traditional methods, and provides more reliable data support for the production of digital customized crown and bridge restorations.

[0072] After completing the data preprocessing in step S104, the model needs to be fully quality checked, including checking the integrity, surface smoothness, resolution and accuracy of the model. Through quality inspection, possible problems can be discovered and corrected in time to ensure the accuracy and reliability of the model. If the scanned data contains upper and lower jaw models, it is necessary to verify whether the occlusal relationship between them is correct. This can be achieved by aligning the upper and lower jaw models and checking the contact area and position between them. The accuracy of the occlusal relationship is crucial for subsequent design and treatment. Before using the data for subsequent design, the compatibility of the data needs to be checked, including checking whether the data format is compatible with the design software and whether the data contains all the necessary information and parameters. Through compatibility checking, it can be ensured that the data can be correctly loaded and processed in the design software.

[0073] After completing the data preprocessing, the need for a comprehensive quality check of the model was emphasized, including the integrity, surface smoothness, resolution and accuracy of the model. This step can promptly discover and correct possible problems, ensure the accuracy and reliability of the model, and provide a solid foundation for subsequent design and treatment. Secondly, for the scan data containing the upper and lower jaw models, a method for verifying the correctness of the occlusal relationship was proposed. By aligning the upper and lower jaw models and checking the contact area and position between them, the accuracy of the occlusal relationship can be ensured, which is crucial for subsequent design and treatment. This step effectively avoids the problem of restoration mismatch caused by inaccurate occlusal relationship and improves patient comfort and satisfaction. In addition, the check of data compatibility was emphasized. Before using the data for subsequent design, it is necessary to check whether the data format is compatible with the design software and whether the data contains all the necessary information and parameters. This step can ensure that the data can be correctly loaded and processed in the design software, avoiding design errors and delays caused by data incompatibility.

[0074] S20, Virtual Tooth Extraction and Precise Design: Perform virtual tooth extraction to ensure that the adjacent surfaces and roots are flat after tooth extraction, avoid over-repair or wrong repair, refer to the original scanned working model data, accurately repair the edge line and adjacent surface of the digital customized prefabricated restoration, and cut back according to the target shape before restoring the virtual prepared abutment shape. According to the clinical requirements of the final restoration material for the restoration space, the thickness of the tooth tissue to be removed is accurately controlled by the compensation value;

[0075] Step S20 specifically includes the following steps:

[0076] S201. Virtual tooth extraction operation: In the interface of 3shape software, import the intraoral scan data that has been preprocessed and verified to be correct. In the toolbar of 3shape software, find and select the precise selection and cutting tool for virtual tooth extraction. This tool allows users to simulate the real tooth extraction process by specifying the area and depth of tooth extraction. According to the treatment plan, use the tooth extraction tool to accurately define the tooth area to be extracted on the 3D model. At the same time, accurate cutting lines should be drawn on the crown and root of the tooth to ensure that the adjacent surface and root are flat after tooth extraction to avoid unnecessary damage to the surrounding teeth. After confirming the tooth extraction area, click the button to execute the tooth extraction operation. 3shape software will simulate the tooth extraction process and remove the specified tooth part according to the user-defined cutting line. After the tooth extraction operation is completed, use the software's viewing tool to carefully check the tooth extraction area to ensure that the adjacent surface and root are flat, and there is no over-repair or mis-repair. If any problems are found, you can use the editing tool to make fine adjustments.

[0077] S202. Accurately design the restoration margins and adjacent surfaces: Use the comparison tool of the 3shape software to compare the model after tooth extraction with the original working model data. This helps to ensure the accuracy of the tooth extraction operation and serves as a reference for the subsequent design of the restoration. Based on the comparison results, use the software's editing tools to draw precise contours on the 3D model. These contours will serve as the basis for the margins and adjacent surfaces of the digital customized prefabricated restoration. During the drawing process, it is necessary to ensure the fit of the restoration to the surrounding teeth to avoid excessive gaps or overlaps. Before restoring the virtual prepared abutment shape, perform a backcut operation based on the target shape. This usually involves making minor adjustments to the margins and adjacent surfaces of the restoration to ensure that the restoration fits the abutment perfectly when it is finally installed, while maintaining an appropriate gap to accommodate the restoration material.

[0078] S203. Adjusting the thickness of tooth tissue and optimizing restorations: Based on the clinical requirements of the final restoration material for the restoration space, use the measurement and adjustment tools of the 3shape software to accurately adjust the thickness of the tooth tissue to be removed. This involves measuring and adjusting the thickness inside the restoration on a three-dimensional model to ensure that the strength and stability of the restoration meet clinical requirements. After completing the above steps, perform a final inspection and optimization of the restoration, which includes checking the shape, size, fit of the margins and adjacent surfaces of the restoration, and ensuring that there are no unnecessary gaps or defects inside the restoration. If any problems are found, the editing tools can be used for further adjustment and optimization.

[0079] In the virtual tooth extraction operation, through the precise selection and cutting tools of 3shape software, users can simulate the real tooth extraction process and accurately define the tooth area to be extracted on the 3D model, while drawing precise cutting lines to ensure the smoothness of the adjacent surfaces and roots after tooth extraction and avoid unnecessary damage to the surrounding teeth. This step greatly improves the accuracy and safety of the virtual tooth extraction operation and provides a good foundation for the design of subsequent restorations. In the precise design of the restoration margins and adjacent surfaces, the importance of using the comparison tool of 3shape software to compare the model after tooth extraction with the original working model data is emphasized, which helps to ensure the accuracy of the tooth extraction operation and serves as a reference for the subsequent design of the restoration. At the same time, by drawing precise contour lines as the restoration Based on the margin line and adjacent surface, and cutting back according to the target morphology, the fit of the restoration to the surrounding teeth can be ensured to avoid excessive gaps or overlaps. This step improves the accuracy and adaptability of the restoration design, and further ensures the therapeutic effect of the restoration. In regulating the thickness of tooth tissue and optimizing the restoration, a method is proposed to use the measurement and adjustment tools of 3shape software to accurately control the thickness of tooth tissue to be removed based on the requirements of the final clinical restoration material for the restoration space. This step ensures that the strength and stability of the restoration meet clinical requirements while avoiding unnecessary tooth tissue damage. In addition, the final inspection and optimization of the restoration can further ensure the quality of the restoration and improve the patient's experience and treatment effect.

[0080] In step S201, when defining the tooth extraction area, the 3D visualization function of the 3shape software is used to view the tooth extraction area from different angles and levels to ensure the accuracy and completeness of the cutting line, which helps to avoid missing or incorrectly repairing parts of the tooth. Before performing the tooth extraction operation, the preview function of the software is used to view the tooth extraction simulation results, which helps the user evaluate the feasibility and accuracy of the tooth extraction operation and make adjustments when necessary. If the tooth extraction operation causes small defects or unevenness in the model, the restoration tool of the 3shape software is used for fine-tuning, which can ensure that the model after tooth extraction still has sufficient completeness and accuracy for subsequent design. In step S202, when drawing the edge line and adjacent surface of the restoration, the fine-tuning tool of the software is used for fine-tuning, which can ensure the smoothness and fit of the edge line and adjacent surface. During the design process, the software's adaptability assessment tool is used to check the fit of the restoration to the surrounding teeth, which helps to identify potential problems and make adjustments to ensure the accuracy and stability of the restoration. In step S203, when adjusting the thickness of the tooth tissue, the software's dynamic adjustment function is used, which allows the user to adjust the thickness of the restoration in real time according to the requirements of the restorative materials and clinical needs, and ensure the strength and stability of the restoration. After completing the design and adjustment of the restoration, the software's overall optimization function is used for final inspection and optimization, which can ensure the fit of the restoration's shape, size, margins and adjacent surfaces, as well as the integrity and stability of the internal structure. At the same time, the restoration can be checked for unnecessary gaps or defects, and further adjustments and optimizations can be made.

[0081] In step S201, the 3D visualization function of the 3shape software is used to view the tooth extraction area from different angles and levels to ensure the accuracy and completeness of the cutting line and avoid missing or incorrectly repairing parts of the tooth. At the same time, the preview function of the software is used to view the tooth extraction simulation results to evaluate the feasibility and accuracy of the tooth extraction operation, and to make adjustments when necessary to ensure that the model after the tooth extraction still has sufficient completeness and accuracy. If the tooth extraction operation causes small defects or unevenness in the model, the software's restoration tools can be used to make fine adjustments to further ensure the accuracy of the model. In step S202, the 3shape software's refinement processing tools are used to make fine adjustments to ensure the smoothness and adaptability of the restoration's edge lines and adjacent surfaces to avoid excessive gaps or overlaps. At the same time, the software's adaptability evaluation tools are used to check the restoration and surrounding teeth. The adaptability of the teeth can be detected and adjusted to ensure the accuracy and stability of the restoration. The refinement of this step helps to improve the design accuracy and adaptability of the restoration, and further ensure the therapeutic effect of the restoration. In step S203, the dynamic adjustment function of the 3shape software is used to control the thickness of the tooth tissue. The thickness of the restoration can be adjusted in real time according to the requirements of the restorative materials and clinical needs to ensure the strength and stability of the restoration. At the same time, after completing the design and adjustment of the restoration, the overall optimization function of the software is used for final inspection and optimization to ensure the shape, size, adaptability of the edges and adjacent surfaces of the restoration, as well as the integrity and stability of the internal structure. In addition, the restoration can be checked for unnecessary gaps or defects, and further adjustments and optimizations can be made to further improve the quality of the restoration and the therapeutic effect.

[0082] S30, copy and modify the order: Use the "Copy CAD design and attach it to the prepared scan" function in the order copy to copy the order completed in step S20. The purpose of this copying process is to copy the order with the designed virtual prepared abutment shape and transform it into a working model order that can be recognized by the software and contains virtual prepared abutments, so that after changing the restoration type of this order to an anatomical crown, a digital customized prefabricated crown and bridge restoration can be designed;

[0083] Step S30 specifically includes the following steps:

[0084] S301. Open 3shape software and locate the order management interface: First, start 3shape software and ensure that the software version is the latest so that all functions and optimizations can be used. Find and click "Order Management" or an icon with similar functions in the main interface of the software to enter the order management interface;

[0085] S302. Select and copy the completed S20 order: In the order list, find and select the order that has completed S20, right-click the selected order, or click the "Action" button next to the order, and select the option "Copy the CAD design and attach it to the prepared scan". The system will prompt you to confirm the copy operation, click "Confirm" or a similar button to copy;

[0086] S303, confirm the copied order information: after the copying is completed, the software will automatically generate a new order, which will contain the CAD design of the original order and the attached preparation scans. Check the details of the new order to ensure that the CAD design and preparation scans are correctly attached;

[0087] S304, converting the new order into a working model order with virtual prepared abutments: in the editing interface of the new order, find "restoration type" or similar options, and select "anatomical crown" or similar options from the drop-down menu to convert the order into a working model order with virtual prepared abutments. The system may prompt some automatic adjustments or confirmations, and you can operate according to the prompts;

[0088] S305. Adjust design parameters to match the requirements of the digital customized prefabricated crown and bridge restoration: According to the design requirements of the digital customized prefabricated crown and bridge restoration, adjust design parameters such as material, thickness, color, etc. to ensure that these parameters match the patient's oral condition and clinical needs;

[0089] S306. Save and preview the modified order: After completing all necessary adjustments, click the "Save" button to save the modified order, and use the preview function of the software to view the effect of the modified order to ensure that the design meets the requirements;

[0090] S307, prepare to enter the next design process: Now, the order is ready to enter the next design process, that is, designing the specific shape and structure of the digital customized prefabricated crown and bridge restoration. This step can be completed by using various design tools and functions provided by 3shape software as needed.

[0091] S40, Design parameter setting and shape correction: copy and modify the order, adjust the direction of the insertion path according to the design requirements, draw the edge line of the digital customized prefabricated crown and bridge restoration, and set the design parameters according to the selected material to ensure the strength and aesthetics of the restoration. Perform a comprehensive correction of the restoration shape, including the design of the labial surface, mesial surface, lingual side, distal surface and tissue surface to meet personalized needs;

[0092] Step S40 specifically includes the following steps:

[0093] S401, adjust the insertion path and draw the margin line: open the converted working model order containing the virtual prepared abutment in the 3shape software, and use the tools in the software to adjust the insertion path direction according to the patient's oral condition and clinical needs, and fine-tune the installation position of the restoration to ensure its stability and functionality in the mouth, verify the correctness of the insertion path direction, and ensure that the restoration can be smoothly placed in place during the installation process. In the software, use the margin line drawing tool to accurately draw the margin line of the restoration according to the design requirements and the form of the working model, ensure that the margin line is smooth and continuous, and coordinated with the surrounding teeth and gingival tissues, verify the position and shape of the margin line, and ensure that it meets clinical requirements and aesthetic standards;

[0094] S402, setting design parameters and correcting appearance: according to the physical properties of the selected materials and clinical requirements, set the corresponding design parameters in the software, including key indicators such as thickness, strength, hardness, and wear resistance of the restoration. When setting, it is necessary to ensure that the restoration has sufficient strength and stability while meeting the aesthetic requirements. Use the editing tools of the software to finely design the labial surface of the restoration to ensure its coordination and aesthetics with the surrounding teeth. Similarly, finely design the mesial surface, lingual side, and distal surface of the restoration to ensure their adaptability and coordination with the surrounding teeth. According to the specific conditions of the patient and clinical requirements, the tissue surface of the restoration is precisely designed, including adjusting the contact relationship and morphology between the restoration and tissues such as the gums and alveolar bones;

[0095] S403, Verification and Adjustment: After completing the preliminary design, use the software's verification tools to conduct a comprehensive verification of the restoration, which includes checking the shape, size, fit of the margins and adjacent surfaces of the restoration, and ensuring that there are no unnecessary gaps or defects inside the restoration. If any problems are found, use the editing tools for further adjustment and optimization. During the verification process, special attention should be paid to the fit of the restoration with the surrounding teeth and tissues, as well as the integrity and uniformity of the restoration. Any problems found should be adjusted and optimized in a timely manner to ensure the design accuracy and completeness of the restoration.

[0096] In step S401, the rotation, translation and scaling tools of the software are used to accurately position and orient the 3D model, especially to adjust the placement direction of the restoration, ensuring that the restoration can be smoothly placed in place during final installation and form a good fit with the surrounding teeth and tissues. At the same time, the margin lines of the restoration are accurately drawn on the 3D model, including key areas such as the gingival margin line, adjacent surface and axial surface of the crown and bridge, ensuring the accuracy and aesthetics of the margin lines, and providing a fine contour foundation for the design of the restoration. In step S402, according to the physical properties of the selected material and clinical requirements, the corresponding design parameters are set in the software to ensure that the restoration has sufficient strength and stability while meeting the aesthetic requirements. At the same time, the labial, mesial, lingual and lateral surfaces of the restoration are edited using the software's editing tools. The distal surface is carefully designed to ensure the coordination and aesthetics of the restoration with the surrounding teeth. In addition, the tissue surface of the restoration is precisely designed according to the patient's specific situation and clinical requirements, and the contact relationship and morphology between the restoration and the gums, alveolar bone and other tissues are adjusted to further improve the adaptability and functionality of the restoration. Finally, in step S403, the software's verification tool is used to comprehensively verify the restoration, and the shape, size, fit of the edges and adjacent surfaces of the restoration, as well as the integrity and uniformity of the restoration are checked. For any problems found, editing tools are used in a timely manner for further adjustment and optimization to ensure the design accuracy and completeness of the restoration. The refinement of this step helps to improve the design quality of the restoration and reduce the risk of restoration failure due to improper design.

[0097] In step S401, when adjusting the direction of the insertion path, in addition to using the rotation, translation and zoom tools of the software, fine-tuning can also be performed in combination with the patient's intraoral scan data or intraoral photos to ensure that the insertion direction of the restoration is highly matched with the patient's actual oral condition. When drawing the edge line of the restoration, the automatic fitting function of the software or the manual adjustment tool is used to smooth the edge line to reduce the difficulty and error in later processing. After the edge line is drawn, the continuity and accuracy of the edge line are verified using the inspection tool of the software to ensure that there is no breakage or dislocation. In step S402, when setting the design parameters, the relevant properties are imported into the design software according to the physical properties of the selected material, such as elastic modulus, thermal expansion coefficient, etc., so as to more accurately simulate the performance of the restoration. When correcting the shape of the restoration, in addition to the labial surface, mesial surface, lingual side and distal surface, the following are some of the properties of the material: In addition to the detailed design of the mid-surface, you can also consider adding slight texture or color changes to increase the naturalness and aesthetics of the restoration. When designing the tissue surface of the restoration, use the simulation function of the software to dynamically adjust the contact relationship between the restoration and tissues such as the gums and alveolar bone to ensure that the restoration can maintain good stability and adaptability after installation. In step S403, after completing the preliminary design, use the simulation installation function of the software to virtually install the restoration in the patient's oral model to check its fit and coordination with the surrounding teeth and tissues. In addition to checking the external shape and edge fit of the restoration, it is also necessary to check the internal structure of the restoration such as connection holes, retention grooves, etc. to ensure their accuracy and functionality. During the verification process, the restoration is observed and inspected from different angles to ensure its fit and aesthetics in all directions.

[0098] In step S401, in addition to using the software's rotation, translation, and scaling tools, the patient's intraoral scan data or intraoral photos are also combined for fine-tuning. This innovative approach ensures that the placement direction of the restoration is highly matched with the patient's actual oral condition, greatly improving the accuracy and practicality of the design. At the same time, when drawing the restoration edge line, the software's automatic fitting function or manual adjustment tool is used to smooth the edge line, reducing the difficulty and error in later processing. After the edge line is drawn, the software's inspection tool is used to verify the continuity and accuracy of the edge line to ensure the quality of the restoration. In step S402, it is emphasized that according to the physical properties of the selected material, such as elastic modulus, thermal expansion coefficient, etc., the relevant properties are imported into the design software. This approach can more accurately simulate the performance of the restoration and provide a more reliable basis for the design. At the same time, when correcting the restoration shape, in addition to fine-tuning the labial surface, mesial surface, lingual side and distal surface, Consideration was also given to adding slight texture or color changes to increase the naturalness and aesthetics of the restoration. This innovative design idea greatly improved the aesthetic effect of the restoration and met the patient's high requirements for aesthetics. When designing the tissue surface of the restoration, the simulation function of the software was used to dynamically adjust the contact relationship between the restoration and tissues such as the gums and alveolar bone. This approach ensured that the restoration could maintain good stability and adaptability after installation, reducing the risk of restoration failure due to improper design. In step S403, the importance of using the simulation installation function of the software to virtually install and comprehensively check the restoration was emphasized. Through simulated installation, the fit and coordination of the restoration with the surrounding teeth and tissues can be checked to ensure its fit and aesthetics in all directions. At the same time, the internal structures of the restoration, such as connection holes and retention grooves, were checked to ensure their accuracy and functionality. This comprehensive verification process greatly improved the design quality and reliability of the restoration.

[0099] S50. Design of auxiliary positioning device and observation window: On the basis of designing digital customized crown and bridge restoration, auxiliary positioning device and observation window are added. Design parameters according to material characteristics to ensure the stability and functionality of auxiliary device, trim the shape of retention device, and set the positioning observation window in the accessory tool to facilitate the subsequent trial wearing and precise adjustment during bonding.

[0100] Step S50 specifically includes the following steps:

[0101] S501. Analysis of design requirements and material evaluation: Conduct in-depth research on the materials selected for digital customized crown and bridge restorations to understand their physical properties such as hardness, toughness, wear resistance, and chemical stability. These properties will directly affect the design parameters of auxiliary positioning devices and observation windows, such as thickness and strength. According to the structural characteristics, size, position of the restoration and the patient's oral condition, we determine the type of auxiliary positioning devices that need to be added, such as guides, positioning pins or support frames. At the same time, we will also determine the location of the observation window at the appropriate position of the restoration, so that the adaptation of the restoration and the surrounding tissue can be clearly observed during the subsequent trial wearing and bonding process;

[0102] S502. Design of auxiliary positioning device: Using design software, we draw preliminary design sketches according to the determined auxiliary device type. These sketches will include key information such as the shape, size and position of the device. According to the material properties and design requirements, we set appropriate parameters for the auxiliary device, such as thickness, strength, toughness, etc. These parameters will ensure the stability and functionality of the device while reducing interference with oral tissues. Using the simulation function of the software, we optimize the structure of the auxiliary device. By adjusting the shape, size and position of the device, we ensure that it is easy to install and disassemble while reducing interference with oral tissues.

[0103] S503. Design the observation window and trim the retention device: Based on the determined position and size, use the design software to draw the outline of the observation window. Then, we set appropriate parameters for the observation window according to the material properties and design requirements, such as transparency, thickness, strength, etc. These parameters will ensure that the observation window can meet the observation requirements and have good durability. According to the design of the auxiliary positioning device and the observation window, we adjust the shape and size of the retention device of the restoration. By optimizing the shape and size of the retention device, we ensure that it can provide sufficient retention force while avoiding unnecessary damage to the oral tissue;

[0104] S504. Set the observation window in place and save and output the file: In the accessory tool, we add observation window marks to the restoration. These marks will help us accurately identify and open the observation window during the subsequent production and installation process. Then, we use the verification function of the software to verify the opening position and size of the observation window to ensure that it can meet the observation requirements. After completing the design, we save the restoration file in an editable format for subsequent modification and optimization. Then, according to the requirements of the production equipment, we convert the design file into an appropriate format and output it to the production equipment for subsequent processing and production.

[0105] In step S501, through in-depth research and analysis of the selected materials, the design parameters of the auxiliary positioning device and the observation window, such as thickness and strength, are clarified, which provides a reliable basis for subsequent design work. At the same time, according to the structural characteristics of the restoration and the oral condition of the patient, the type of auxiliary positioning device and the location of the observation window to be added are determined, which ensures the pertinence and practicality of the design. In step S502, the preliminary design sketch of the auxiliary positioning device is drawn using the design software, and appropriate parameters are set according to the material properties and design requirements. Through the simulation function of the software, the structure of the auxiliary device is optimized to ensure its stability and functionality, while reducing interference with oral tissues. The refinement of this step not only improves the accuracy of the design, but also reduces the risks in actual operation. In step S503, according to the determined position and size, The outline of the observation window is drawn and appropriate parameters such as transparency, thickness, strength, etc. are set. The setting of these parameters ensures that the observation window can meet the observation needs and has good durability. At the same time, the shape and size of the retention device of the restoration are adjusted to optimize its retention effect and avoid unnecessary damage. The improvement of this step improves the overall performance of the restoration and the comfort of the patient. In step S504, the accuracy and practicality of the design are ensured by adding a mark of the observation window to the restoration and using the verification function of the software to verify the opening position and size of the observation window. After the design is completed, the restoration file is saved in an editable format and converted into an appropriate format for output to the production equipment, which facilitates subsequent production and processing. The normalization and standardization of this step improves design efficiency and quality and reduces production costs.

[0106] In step S501, a comprehensive analysis of the patient's oral environment is performed, including tooth arrangement, occlusal relationship, gum condition, etc., so as to more accurately determine the design requirements of the auxiliary positioning device and the observation window. In step S502, when designing the auxiliary positioning device, its compatibility with other oral treatments or restorations should be ensured to avoid mutual interference. Mechanical analysis software is used to perform mechanical simulation on the auxiliary device to evaluate its stability and durability in the oral environment. In step S503, when designing the observation window, its field of view should be ensured to be large enough so that the doctor can clearly observe the adaptation of the restoration to the surrounding tissue. The details of the retention device are optimized, such as edge processing, chamfer design, etc., to reduce stimulation and damage to oral tissue. In step S504, auxiliary marks are added to the restoration, such as positioning points, alignment lines, etc., to help the doctor more accurately position and adjust the restoration during subsequent production and installation. Before outputting the design file, a file quality check is performed to ensure that the file is complete, accurate and error-free for subsequent processing and production.

[0107] In step S501, a comprehensive analysis of the patient's oral environment is performed, including tooth arrangement, occlusion, gum condition, etc. This approach can more accurately determine the design requirements of the auxiliary positioning device and the observation window, thereby improving the adaptability and use effect of the restoration. In step S502, when designing the auxiliary positioning device, not only its functionality is considered, but also attention is paid to the compatibility with other oral treatments or restorations to avoid mutual interference. At the same time, mechanical simulation is performed using mechanical analysis software to evaluate the stability and durability of the auxiliary device in the oral environment to ensure its reliability in long-term use. In step S503, when designing the observation window, it is ensured that the field of view is large enough. The doctor can clearly observe the fit between the restoration and the surrounding tissue, thereby improving the accuracy and success rate of the restoration. At the same time, the details of the retention device are optimized, such as edge processing, chamfer design, etc., which reduces stimulation and damage to oral tissue and improves patient comfort. In step S504, by adding auxiliary marks on the restoration, such as positioning points, alignment lines, etc., a more accurate positioning and adjustment basis is provided to the doctor during the subsequent production and installation process, reducing the difficulty and error of operation. In addition, a file quality check is performed before the design file is output to ensure the integrity, accuracy and error-freeness of the file, providing a reliable foundation for subsequent processing and production.

[0108] S60, Manufacturing and Verification: Export the designed digital customized crown and bridge restoration data to the CAD / CAM system for manufacturing, and verify the manufactured restoration to ensure that it is consistent with the design requirements and meets clinical use needs.

[0109] Step S60 specifically includes the following steps:

[0110] S601, exporting data to CAD / CAM system: exporting the digital customized crown and bridge restoration data carefully designed and optimized in the previous steps S10 to S40 to the CAD / CAM system using dedicated software or interface to ensure accurate transmission of design data and provide an accurate blueprint for subsequent manufacturing process;

[0111] S602, Manufacturing preparation and data check: In the CAD / CAM system, the manufacturing preparation of the restoration is carried out according to the exported data, including data format conversion, model preprocessing, etc. The technicians conduct a detailed inspection of the data to ensure that there is no data loss or format error, and to ensure that the data can be successfully recognized and processed by the manufacturing equipment;

[0112] S603, physical manufacturing: using the manufacturing equipment in the CAD / CAM system (to carry out physical manufacturing of the restoration according to the prepared data, the technicians pay close attention to the operation status and manufacturing progress of the equipment to ensure the smooth progress of the manufacturing process, and pay attention to the manufacturing accuracy and efficiency to ensure the quality and cost of the restoration;

[0113] S604. Verification and feedback: The completed restorations are subject to various aspects of verification, including appearance inspection, dimensional measurement and functional testing. Appearance inspection: Check whether the surface quality and color of the restorations meet the design requirements. Dimension measurement: Use precision measuring tools to accurately measure the dimensions of the restorations to ensure consistency with the design requirements. Functional testing: Test whether the occlusal relationship and retention force of the restorations meet the clinical use requirements. If any problems are found with the restorations or they do not meet the design requirements, they will be immediately recorded and fed back to the design team for correction to ensure continuous improvement and optimization of the manufacturing process of digital customized crown and bridge restorations. After verification, the restorations will be packaged and prepared for clinical installation and use to ensure that the storage and transportation conditions of the restorations meet relevant regulations.

[0114] In step S601, the design data is accurately exported to the CAD / CAM system through dedicated software or interface, ensuring the accuracy and completeness of the data and providing a reliable blueprint for the subsequent manufacturing process. This step effectively avoids errors and losses in the data transmission process and improves the accuracy and reliability of the manufacturing process. In step S602, the manufacturing preparation and data inspection links are given full attention. The technicians conduct a detailed inspection of the data to ensure that the data format is correct and the model preprocessing is complete, thereby ensuring that the data can be smoothly recognized and processed by the manufacturing equipment. This step reduces manufacturing errors and rework caused by data problems and improves manufacturing efficiency and cost-effectiveness. In step S603, the actual The whole manufacturing process is effectively controlled, and the technicians pay close attention to the operating status of the equipment and the manufacturing progress, as well as the manufacturing accuracy and efficiency. This step ensures that the quality and cost of the restoration are effectively controlled, and improves the adaptability and service life of the restoration. Finally, in step S604, the verification and feedback mechanism is improved, and the manufactured restoration is subjected to multiple verifications such as appearance inspection, dimensional measurement and functional testing to ensure the quality and adaptability of the restoration. At the same time, if any problems are found in the restoration or it does not meet the design requirements, it is immediately recorded and fed back to the design team for correction. This step not only improves the quality of the restoration, but also promotes the continuous improvement and optimization of the manufacturing process.

[0115] High-quality intraoral scan data is imported into 3shape software and preprocessed. This step is the basis for subsequent design. By ensuring the accuracy and completeness of the data, it provides a reliable basis for subsequent steps. The preprocessing process may include removing noise, filling missing data, adjusting scanning angles, etc., to ensure that the data can truly reflect the patient's oral condition. Then virtual tooth extraction and precise design are carried out. Through virtual tooth extraction operations, the real tooth extraction process can be simulated to ensure that the proximal surfaces and roots after tooth extraction are flat, avoiding multiple repairs or misrepairs. At the same time, the original working model data is referred to to accurately repair the edge lines and proximal surfaces of the digital customized prefabricated restorations. Before restoring the virtual prepared abutment shape, it is cut back according to the target shape, and according to the requirements of the final clinical restoration material for the restoration space, the thickness of the tooth tissue to be removed is accurately adjusted by the compensation value. This step ensures the accuracy and adaptability of the restoration. Design parameter setting and appearance correction are carried out. By copying and modifying the order, according to the design requirements. The direction of the positioning channel is adjusted, and the edge line of the digital customized prefabricated crown and bridge restoration is drawn. At the same time, the design parameters are set according to the selected material to ensure the strength and aesthetics of the restoration, and the shape of the restoration is comprehensively modified, including the design of the labial surface, mesial surface, lingual side, distal surface and tissue surface to meet the patient's personalized needs. Then, an auxiliary positioning device and an observation window are added, and the design parameters are designed according to the material characteristics to ensure the stability and functionality of the auxiliary device. At the same time, the shape of the retention device is trimmed, and a positioning observation window is set in the accessory tool to facilitate subsequent trial wearing and precise adjustment during bonding. This step improves the installation efficiency and accuracy of the restoration. Finally, the designed digital customized crown and bridge restoration data is exported to the CAD / CAM system for manufacturing. Through high-precision CNC machining technology, a restoration consistent with the design requirements can be manufactured, and the manufactured restoration is verified to ensure that it meets the clinical use needs. This step ensures the quality and reliability of the final product.

[0116] In summary, this method achieves personalized, accurate and efficient crown and bridge restoration production through high-precision digital design and manufacturing processes. Each step strictly follows the principle of digital customization, ensuring the quality and adaptability of the final product and providing patients with high-quality oral restoration solutions.

[0117] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0118] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a digital customized prefabricated crown and bridge restoration, characterized in that: The steps include: S10, data import and order creation: Create an order in 3shape software, design the virtual prepared abutment shape according to the order design process, import high-quality intraoral scan data, pre-process the scan data to ensure the accuracy and completeness of the data, and provide a basis for subsequent design; S20, Virtual Tooth Extraction and Precise Design: Perform virtual tooth extraction to ensure that the adjacent surfaces and roots are flat after tooth extraction, avoid over-repair or wrong repair, refer to the original scanned working model data, accurately repair the edge line and adjacent surface of the digital customized prefabricated restoration, and cut back according to the target shape before restoring the virtual prepared abutment shape. According to the clinical requirements of the final restoration material for the restoration space, the thickness of the tooth tissue to be removed is accurately controlled by the compensation value; S30, copy and modify order: Use the "Copy CAD design and attach it to the prepared scan" function in the order copy to copy the order completed in step S20. The purpose of this copying process is to copy the order with the designed virtual prepared abutment shape and transform it into a working model order that can be recognized by the software and contains virtual prepared abutments, so that after changing the restoration type of this order to anatomical crown, a digital customized prefabricated crown and bridge restoration can be designed; S40, Design parameter setting and shape correction: Adjust the direction of the insertion path according to the design requirements, draw the edge line of the digital customized prefabricated crown and bridge restoration, set the design parameters according to the selected material, ensure the strength and aesthetics of the restoration, and make comprehensive corrections to the restoration shape, including the design of the labial surface, mesial surface, lingual side, distal surface and tissue surface to meet personalized needs; S50. Design of auxiliary positioning device and observation window: On the basis of designing digital customized crown and bridge restoration, auxiliary positioning device and observation window are added, relevant thickness parameters are designed according to material characteristics to ensure the stability and functionality of the auxiliary device, the shape of the retention device is trimmed, and the positioning observation window is set in the accessory tool to facilitate the subsequent trial wearing and precise adjustment during bonding; S60, Manufacturing and Verification: Export the designed digital customized crown and bridge restoration data to the CAD / CAM system for manufacturing, and verify the manufactured restoration to ensure that it is consistent with the design requirements and meets clinical use needs.

2. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 1, characterized in that: The step S10 specifically includes the following steps: S101, start 3shape software and create an order: open 3shape software, create a new order in the software interface, select the base crown and anatomical inner crown according to the actual tooth position requirements, and prepare for the next design task; S102. Import high-quality intraoral scan data: Use the formats supported by 3shape software, such as 3OXZ, DCM, etc. to import high-quality intraoral scan data into the software. During the import process, ensure the integrity and accuracy of the data to avoid data loss or damage; S103, data preprocessing: perform a preliminary check on the imported scan data to remove possible noise, redundant points or outliers. If the scan data contains multiple parts such as upper and lower jaws, these parts need to be aligned to ensure their correct positions in the three-dimensional space. For the missing or damaged parts that may exist in the scan data, use the tools provided by the 3shape software to repair or fill them. According to the design requirements, the scan data is further optimized, such as smoothing the surface, adjusting the resolution, etc.; S104, Data Verification: After completing data preprocessing, use the verification tool provided by 3shape software to check the processed data to ensure the accuracy, completeness and consistency of the data, providing a reliable basis for subsequent design; S105. Save the preprocessed data: Save the preprocessed data to a specified location so that it can be called at any time in the subsequent design process. At the same time, a backup can also be created for the data to prevent data loss or damage.

3. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 2, characterized in that: When processing the scanned data in step S103, if the data contains color information such as tooth color, color calibration is required, which can ensure that the color information in the data is accurate and consistent, and provide a basis for subsequent color matching and design. Color calibration usually requires the use of the calibration tool provided by the 3shape software and follows the software's operating instructions. If the scanned data contains complete upper and lower jaw models and further tooth segmentation processing is required, the segmentation tool provided by the 3shape software can be used, which helps to extract each tooth separately for more accurate design and analysis. During the segmentation process, the segmentation parameters and boundaries need to be carefully adjusted to ensure the accuracy and completeness of the segmentation results. In order to ensure the comparability and consistency between different scanned data, the data can be standardized, which includes unifying the data's coordinate system, scaling, and resolution. Through standardization, scanned data from different sources and formats can be compared and analyzed on the same platform.

4. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 2, characterized in that: After completing the data preprocessing in step S104, the model needs to be fully quality checked, including checking the integrity, surface smoothness, resolution and accuracy of the model. Through quality inspection, possible problems can be discovered and corrected in time to ensure the accuracy and reliability of the model. If the scanned data contains upper and lower jaw models, it is necessary to verify whether the occlusal relationship between them is correct. This can be achieved by aligning the upper and lower jaw models and checking the contact area and position between them. The accuracy of the occlusal relationship is crucial for subsequent design and treatment. Before using the data for subsequent design, the compatibility of the data needs to be checked, including checking whether the data format is compatible with the design software and whether the data contains all the necessary information and parameters. Through compatibility checking, it can be ensured that the data can be correctly loaded and processed in the design software.

5. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 1, characterized in that: The step S20 specifically includes the following steps: S201. Virtual tooth extraction operation: In the interface of 3shape software, import the intraoral scan data that has been preprocessed and verified to be correct. In the toolbar of 3shape software, find and select the precise selection and cutting tool for virtual tooth extraction. This tool allows users to simulate the real tooth extraction process by specifying the area and depth of tooth extraction. According to the treatment plan, use the tooth extraction tool to accurately define the tooth area to be extracted on the 3D model. At the same time, accurate cutting lines should be drawn on the crown and root of the tooth to ensure that the adjacent surface and root are flat after tooth extraction to avoid unnecessary damage to the surrounding teeth. After confirming the tooth extraction area, click the button to execute the tooth extraction operation. 3shape software will simulate the tooth extraction process and remove the specified tooth part according to the user-defined cutting line. After the tooth extraction operation is completed, use the software's viewing tool to carefully check the tooth extraction area to ensure that the adjacent surface and root are flat, and there is no over-repair or mis-repair. If any problems are found, you can use the editing tool to make fine adjustments. S202. Accurately design the restoration margins and adjacent surfaces: Use the comparison tool of the 3shape software to compare the model after tooth extraction with the original working model data. This helps to ensure the accuracy of the tooth extraction operation and serves as a reference for the subsequent design of the restoration. Based on the comparison results, use the software's editing tools to draw precise contours on the 3D model. These contours will serve as the basis for the margins and adjacent surfaces of the digital customized prefabricated restoration. During the drawing process, it is necessary to ensure the fit of the restoration to the surrounding teeth to avoid excessive gaps or overlaps. Before restoring the virtual prepared abutment shape, perform a backcut operation based on the target shape. This usually involves making minor adjustments to the margins and adjacent surfaces of the restoration to ensure that the restoration fits the abutment perfectly when it is finally installed, while maintaining an appropriate gap to accommodate the restoration material. S203. Adjusting the thickness of tooth tissue and optimizing restorations: Based on the clinical requirements of the final restoration material for the restoration space, use the measurement and adjustment tools of the 3shape software to accurately adjust the thickness of the tooth tissue to be removed. This involves measuring and adjusting the thickness inside the restoration on a three-dimensional model to ensure that the strength and stability of the restoration meet clinical requirements. After completing the above steps, perform a final inspection and optimization of the restoration, which includes checking the shape, size, fit of the margins and adjacent surfaces of the restoration, and ensuring that there are no unnecessary gaps or defects inside the restoration. If any problems are found, the editing tools can be used for further adjustment and optimization.

6. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 5, characterized in that: The step S30 specifically includes the following steps: S301. Open 3shape software and locate the order management interface: First, start 3shape software and ensure that the software version is the latest so that all functions and optimizations can be used. Find and click "Order Management" or an icon with similar functions in the main interface of the software to enter the order management interface; S302. Select and copy the completed S20 order: In the order list, find and select the order that has completed S20, right-click the selected order, or click the "Action" button next to the order, and select "Copy CAD design and attach it to the prepared scan". The system will prompt you to confirm the copy operation, click "Confirm" or a similar button to copy; S303, confirm the copied order information: after the copying is completed, the software will automatically generate a new order, which will contain the CAD design of the original order and the attached preparation scans. Check the details of the new order to ensure that the CAD design and preparation scans are correctly attached; S304. Convert the new order to a working model order with virtual prepared abutments: In the editing interface of the new order, find "Restoration Type" or similar options, and select "Anatomical Crown" or similar options from the drop-down menu to convert the order to a working model order with virtual prepared abutments. The system may prompt you to make some automatic adjustments or confirmations. Just follow the prompts; S305. Adjust design parameters to match the requirements of the digital customized prefabricated crown and bridge restoration: According to the design requirements of the digital customized prefabricated crown and bridge restoration, adjust design parameters such as material, thickness, color, etc. to ensure that these parameters match the patient's oral condition and clinical needs; S306. Save and preview the modified order: After completing all necessary adjustments, click the "Save" button to save the modified order, and use the preview function of the software to view the effect of the modified order to ensure that the design meets the requirements; S307, prepare to enter the next design process: Now, the order is ready to enter the next design process, that is, designing the specific shape and structure of the digital customized prefabricated crown and bridge restoration. This step can be completed by using various design tools and functions provided by 3shape software as needed.

7. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 5, characterized in that: The step S40 specifically includes the following steps: S401, adjust the insertion path and draw the margin line: open the converted working model order containing the virtual prepared abutment in the 3shape software, and use the tools in the software to adjust the insertion path direction according to the patient's oral condition and clinical needs, and fine-tune the installation position of the restoration to ensure its stability and functionality in the mouth, verify the correctness of the insertion path direction, and ensure that the restoration can be smoothly placed in place during the installation process. In the software, use the margin line drawing tool to accurately draw the margin line of the restoration according to the design requirements and the form of the working model, ensure that the margin line is smooth and continuous, and coordinated with the surrounding teeth and gingival tissues, verify the position and shape of the margin line, and ensure that it meets clinical requirements and aesthetic standards; S402, setting design parameters and correcting appearance: according to the physical properties of the selected materials and clinical requirements, set the corresponding design parameters in the software, including key indicators such as thickness, strength, hardness, and wear resistance of the restoration. When setting, it is necessary to ensure that the restoration has sufficient strength and stability while meeting the aesthetic requirements. Use the editing tools of the software to finely design the labial surface of the restoration to ensure its coordination and aesthetics with the surrounding teeth. Similarly, finely design the mesial surface, lingual side, and distal surface of the restoration to ensure their adaptability and coordination with the surrounding teeth. According to the specific conditions of the patient and clinical requirements, the tissue surface of the restoration is precisely designed, including adjusting the contact relationship and morphology between the restoration and tissues such as the gums and alveolar bones; S403, Verification and Adjustment: After completing the preliminary design, use the software's verification tools to conduct a comprehensive verification of the restoration, which includes checking the shape, size, fit of the margins and adjacent surfaces of the restoration, and ensuring that there are no unnecessary gaps or defects inside the restoration. If any problems are found, use the editing tools for further adjustment and optimization. During the verification process, special attention should be paid to the fit of the restoration with the surrounding teeth and tissues, as well as the integrity and uniformity of the restoration. Any problems found should be adjusted and optimized in a timely manner to ensure the design accuracy and completeness of the restoration.

8. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 7, characterized in that: In step S401, when adjusting the seating direction, in addition to using the rotation, translation and scaling tools of the software, fine-tuning can also be performed in combination with the patient's intraoral scan data or intraoral photos to ensure that the seating direction of the restoration is highly matched with the patient's actual oral condition. When drawing the edge line of the restoration, the software's automatic fitting function or manual adjustment tool is used to smooth the edge line to reduce the difficulty and error in later processing. After the edge line is drawn, the software's inspection tool is used to verify the continuity and accuracy of the edge line to ensure that there is no breakage or dislocation. When setting the design parameters in step S402, the relevant properties are imported into the design software according to the physical properties of the selected material, such as elastic modulus, thermal expansion coefficient, etc., so as to more accurately simulate the performance of the restoration. When correcting the appearance of the restoration, in addition to the labial surface, mesial surface, lingual surface and In addition to the detailed design of the distal surface, you can also consider adding slight texture or color changes to increase the naturalness and aesthetics of the restoration. When designing the tissue surface of the restoration, use the simulation function of the software to dynamically adjust the contact relationship between the restoration and tissues such as the gums and alveolar bone to ensure that the restoration can maintain good stability and adaptability after installation. In step S403, after completing the preliminary design, use the simulation installation function of the software to virtually install the restoration in the patient's oral model to check its fit and coordination with the surrounding teeth and tissues. In addition to checking the external shape and edge fit of the restoration, it is also necessary to check the internal structure of the restoration such as connection holes, retention grooves, etc. to ensure their accuracy and functionality. During the verification process, the restoration is observed and inspected from different angles to ensure its fit and aesthetics in all directions.

9. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 1, characterized in that: The step S50 specifically includes the following steps: S501. Analysis of design requirements and material evaluation: Conduct in-depth research on the materials selected for digital customized crown and bridge restorations to understand their physical properties such as hardness, toughness, wear resistance, and chemical stability. These properties will directly affect the design parameters of auxiliary positioning devices and observation windows, such as thickness and strength. According to the structural characteristics, size, position of the restoration and the patient's oral condition, we determine the type of auxiliary positioning devices that need to be added, such as guides, positioning pins or support frames. At the same time, we will also determine the location of the observation window at the appropriate position of the restoration, so that the adaptation of the restoration and the surrounding tissue can be clearly observed during the subsequent trial wearing and bonding process; S502. Design of auxiliary positioning device: Using design software, we draw preliminary design sketches according to the determined auxiliary device type. These sketches will include key information such as the shape, size and position of the device. According to the material properties and design requirements, we set appropriate parameters for the auxiliary device, such as thickness, strength, toughness, etc. These parameters will ensure the stability and functionality of the device while reducing interference with oral tissues. Using the simulation function of the software, we optimize the structure of the auxiliary device. By adjusting the shape, size and position of the device, we ensure that it is easy to install and disassemble while reducing interference with oral tissues. S503. Design the observation window and trim the retention device: Based on the determined position and size, use the design software to draw the outline of the observation window. Then, we set appropriate parameters for the observation window according to the material properties and design requirements, such as transparency, thickness, strength, etc. These parameters will ensure that the observation window can meet the observation requirements and have good durability. According to the design of the auxiliary positioning device and the observation window, we adjust the shape and size of the retention device of the restoration. By optimizing the shape and size of the retention device, we ensure that it can provide sufficient retention force while avoiding unnecessary damage to the oral tissue; S504. Set the observation window in place and save and output the file: In the accessory tool, we add observation window marks to the restoration. These marks will help us accurately identify and open the observation window during the subsequent production and installation process. Then, we use the verification function of the software to verify the opening position and size of the observation window to ensure that it can meet the observation requirements. After completing the design, we save the restoration file in an editable format for subsequent modification and optimization. Then, according to the requirements of the production equipment, we convert the design file into an appropriate format and output it to the production equipment for subsequent processing and production.

10. The method for manufacturing a digital customized prefabricated crown and bridge restoration according to claim 9, characterized in that: In step S501, a comprehensive analysis of the patient's oral environment is performed, including tooth arrangement, occlusal relationship, gum condition, etc., so as to more accurately determine the design requirements of the auxiliary positioning device and the observation window. In step S502, when designing the auxiliary positioning device, its compatibility with other oral treatments or restorations should be ensured to avoid mutual interference. Mechanical analysis software is used to perform mechanical simulation on the auxiliary device to evaluate its stability and durability in the oral environment. In step S503, when designing the observation window, its field of view should be ensured to be large enough so that the doctor can clearly observe the adaptation of the restoration to the surrounding tissue. The details of the retention device are optimized, such as edge processing, chamfer design, etc., to reduce stimulation and damage to oral tissue. In step S504, auxiliary marks are added to the restoration, such as positioning points, alignment lines, etc., to help the doctor more accurately position and adjust the restoration during subsequent production and installation. Before outputting the design file, a file quality check is performed to ensure that the file is complete, accurate and error-free for subsequent processing and production.

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