CAD / CAM (computer-aided design / computer-aided manufacturing) fixed structure rod clamp complete denture and preparation method thereof

Abstract

The invention relates to the technical field of complete dentures, and discloses a CAD / CAM (computer-aided design / computer-aided manufacturing) fixed structure rod clamp complete denture and a preparation method thereof. Obtaining an oral cavity three-dimensional model of the user based on optical measurement; preparing an impression for the user based on a preset material; obtaining a three-dimensional digital model of the impression based on scanning equipment, comparing the three-dimensional digital model with the oral cavity three-dimensional model to obtain a fine calibration model, determining the setting position of the fixed structure rod clamp in the fixed structure rod clamp complete denture by adopting CAD according to the fine calibration model, and obtaining scheme data; the scheme is transmitted to a numerical control machine tool, a fixed structure rod clamp is manufactured based on CAM, the fixed structure rod clamp and a base plate are assembled, and the fixed structure rod clamp complete denture is obtained. The arrangement position of the fixing structure rod clamp is optimized by adopting CAD according to the precise calibration model, so that the fixing structure rod clamp better conforms to the oral cavity anatomical structure of a patient, and the retention force and the comfort degree of the false tooth are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of complete dentures, and in particular, to a CAD / CAM fixed structure bar clasp complete denture and a preparation method thereof. Background Art

[0002] Complete dentures are a conventional restoration method for edentulous patients. A complete denture is a removable denture prosthesis that uses artificial materials to replace the missing entire maxillary or mandibular dentition and related tissues. A complete denture consists of two parts: artificial teeth and a denture base. It relies on the adsorption force and atmospheric pressure generated by the close fit between the denture base and the edentulous mucosal tissue and the edge seal to make the denture adsorb on the maxillary and mandibular alveolar ridges, restore the patient's defective tissues and facial appearance, and restore chewing and pronunciation functions. Common complete dentures on the current market: Due to various reasons, elderly patients with long-term tooth loss have severe alveolar bone resorption, resulting in shallow and flat alveolar ridges in the main bearing area of the complete denture, which is not conducive to the retention of the denture.

[0003] Therefore, it is necessary to design a CAD / CAM fixed structure bar clasp complete denture to solve the problems of common complete dentures on the current market, that is, to solve the problems of shallow and flat alveolar ridges in the main bearing area of the complete denture, which are not conducive to the retention of the denture. Summary of the Invention

[0004] In view of this, the present invention provides a CAD / CAM fixed structure bar clasp complete denture and a preparation method thereof, aiming to solve the problems of shallow and flat alveolar ridges in the main bearing area of the current complete denture, which are not conducive to the retention of the denture.

[0005] On the one hand, the present invention provides a preparation method of a CAD / CAM fixed structure bar clasp complete denture, including:

[0006] Examining and evaluating the user to be treated, where the examination and evaluation include oral health status, tooth loss situation, occlusion relationship, and jaw condition; obtaining a three-dimensional oral model of the user to be treated based on optical measurement;

[0007] Preparing an impression for the user to be treated based on a preset material;

[0008] Obtaining a three-dimensional digital model of the impression based on a scanning device, comparing the three-dimensional digital model with the three-dimensional oral model to obtain a refined model, and using CAD (Computer Aided Design) to determine the setting position of the fixed structure bar clasp in the CAD / CAM fixed structure bar clasp complete denture according to the refined model, and obtaining scheme data;

[0009] Transfer the said solution data to the CNC machine tool, manufacture the fixed structure bar clip based on CAM (Computer Aided Manufacturing), and assemble the fixed structure bar clip with the denture base to obtain a full denture with a fixed structure bar clip.

[0010] Further, the optical measurement includes an X-ray film or an oral scan, and the oral scan uses three-dimensional scanning.

[0011] Further, when preparing an impression for the user to be based on a preset material, the preset material includes alginate impression material.

[0012] Further, when obtaining a three-dimensional digital model of the impression based on a scanning device, it includes:

[0013] Scan the impression with a digital scanner.

[0014] Further, when obtaining a refined calibration model by comparing the three-dimensional digital model with the oral three-dimensional model, it includes:

[0015] Obtain the similarity between the three-dimensional digital model and the oral three-dimensional model, compare the similarity with a similarity threshold, and obtain the refined calibration model according to the comparison result;

[0016] When the similarity is greater than or equal to the similarity threshold, use the oral three-dimensional model as the refined calibration model;

[0017] When the similarity is less than the similarity threshold, obtain the refined calibration model according to the oral three-dimensional model and the three-dimensional digital model.

[0018] Further, when obtaining the refined calibration model according to the oral three-dimensional model and the three-dimensional digital model, it includes:

[0019] Align the oral three-dimensional model and the three-dimensional digital model based on the ICP (Iterative Closest Point) algorithm, and through continuous iterative optimization, ensure the maximum point cloud matching degree between the oral three-dimensional model and the three-dimensional digital model, and use the model composed of the point cloud as the refined calibration model.

[0020] Further, when using CAD to determine the installation position of the fixed structure bar clip in the full denture with a fixed structure bar clip according to the refined calibration model, it includes:

[0021] Compare the refined calibration model with a historical reference model, and determine the installation position of the fixed structure bar clip according to the comparison result;

[0022] When there is data in the historical reference model whose model similarity with the refined calibration model is greater than or equal to the similarity threshold, use the historical setting position corresponding to the historical reference model as the setting position of the fixed structural rod clip;

[0023] When the model similarities between the historical reference model and the refined calibration model are all less than the similarity threshold, obtain the setting position of the fixed structural rod clip based on a convolutional neural network model;

[0024] The historical reference model includes several historical refined calibration models and the setting positions of several historical fixed structural rod clips, and each historical refined calibration model corresponds to the setting position of a historical fixed structural rod clip.

[0025] Further, when obtaining the setting position of the fixed structural rod clip based on a convolutional neural network model, it includes:

[0026] Divide the historical reference model into a training set, a validation set, and a test set, train a CNN model based on the training set, tune the model parameters based on the validation set, and evaluate the performance of the model based on the test set;

[0027] Use the backpropagation algorithm to update the model weights and minimize the loss function through an Adam optimizer;

[0028] Determine the input data of the convolutional neural network model, where the input data includes the point cloud, surface mesh data, and three-dimensional geometric structure of the refined calibration model;

[0029] Obtain the output result of the convolutional neural network model and use the output result as the setting position of the fixed structural rod clip.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: By adopting CAD / CAM technology, the personalized design and production of complete dentures are realized, and the problem of difficult retention caused by problems such as low and flat alveolar ridges in traditional complete dentures is solved. Through a comprehensive oral health assessment of the user and based on optical measurement to obtain a three-dimensional model of the oral cavity, the oral data of each patient is made more accurate. Combining the impression made of a preset material with the three-dimensional digital model obtained by the scanning device, through comparison and optimization, a refined calibration model is obtained to ensure the accuracy and adaptability of the design. Using CAD to optimize the setting position of the fixed structural rod clip according to the refined calibration model to make it more in line with the oral anatomical structure of the patient, improving the retention force and comfort of the denture. Transmitting the design scheme to a numerical control machine tool for precise processing through CAM technology, ensuring the accuracy and quality of the denture.

[0031] On the other hand, the present application also provides a CAD / CAM fixed structural rod clip complete denture prepared by using the above-mentioned preparation method of the CAD / CAM fixed structural rod clip complete denture, including:

[0032] The base plate is provided with a first positioning groove and a second positioning groove, and artificial teeth are arranged in the first positioning groove;

[0033] The fixing structure includes a fixing base body, a first fixing clamping groove and a fixing structure rod clamp. The fixing structure rod clamp corresponds to the second positioning groove, and the fixing structure rod clamp is clamped with the second positioning groove;

[0034] The bottom plate is provided with implants. A plurality of implants are provided. The implants correspond to the first fixing clamping grooves, and the first fixing clamping grooves and the implants are fixedly connected by bolts.

[0035] It can be understood that the above CAD / CAM fixing structure rod clamp complete denture and preparation method have the same beneficial effects, which will not be elaborated here. Description of the Drawings

[0036] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0037] Figure 1 It is a flowchart of the preparation method of the CAD / CAM fixing structure rod clamp complete denture provided by the embodiment of the present invention;

[0038] Figure 2 It is a schematic structural diagram of the CAD / CAM fixing structure rod clamp complete denture provided by the embodiment of the present invention.

[0039] Among them, 100, base plate; 110, first positioning groove; 120, second positioning groove; 130, artificial teeth; 210, fixing base body; 220, first fixing clamping groove; 230, fixing structure rod clamp; 300, bottom plate; 310, implant. Detailed Embodiments

[0040] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the drawings and in combination with the embodiments.

[0041] In some embodiments of the present application, refer to Figure 1As shown, a preparation method for a CAD / CAM fixed structure bar clasp complete denture includes:

[0042] S100: Examine and evaluate the user to be treated. The examination and evaluation include oral health status, tooth loss situation, occlusion relationship, and jaw condition. Based on optical measurement, obtain the three-dimensional model of the user's oral cavity.

[0043] S200: Prepare an impression for the user to be treated based on a preset material.

[0044] S300: Obtain the three-dimensional digital model of the impression through a scanning device, compare the three-dimensional digital model with the three-dimensional oral cavity model to obtain a refined model, use CAD to determine the setting position of the fixed structure bar clasp in the CAD / CAM fixed structure bar clasp complete denture according to the refined model, and obtain the scheme data.

[0045] S400: Transmit the scheme data to a numerically controlled machine tool, manufacture the fixed structure bar clasp based on CAM, and assemble the fixed structure bar clasp with the base to obtain the CAD / CAM fixed structure bar clasp complete denture.

[0046] Specifically, in S100, through oral examination, including tooth loss situation, occlusion relationship, jaw condition, etc., basic data for denture design are provided. Through optical scanning technology, the three-dimensional data of the user's oral cavity are obtained, and the shape and tissue structure of the oral cavity are recorded, providing an accurate basis for subsequent design. In S200, a preset material (such as alginate) is used to make an impression for the patient to obtain the physical form of the oral cavity. The accuracy of oral data is ensured through the impression material, providing guarantee for scanning and subsequent digital processes. In S300, a scanning device (such as a three-dimensional digital scanner) is used to obtain the three-dimensional digital model of the impression. This model can accurately reflect every detail of the impression, ensuring no information loss. The three-dimensional oral cavity model is compared with the digital model of the impression, and the refined model is adjusted and generated through algorithms to optimize the model matching degree. The comparison ensures a high matching degree between the digital model and the actual oral situation. Based on the refined model, CAD software is used for design to accurately determine the position of the fixed structure bar clasp in the complete denture and generate the corresponding scheme data, providing an accurate basis for subsequent processing and manufacturing. In S400, the design data are transmitted to a numerically controlled machine tool (CAM), and precise processing is carried out through the numerically controlled machine tool to manufacture the fixed structure bar clasp that meets the design requirements. The manufactured fixed structure bar clasp is assembled with the base, and finally the complete CAD / CAM fixed structure bar clasp complete denture is obtained. This step ensures the stability and comfort of the denture.

[0047] It is understandable that by integrating CAD / CAM technology, highly personalized design and precise fabrication of complete dentures are achieved, solving the problem of difficult retention of traditional complete dentures in cases of shallow or low alveolar ridges, short or flat alveolar processes, etc. Through comprehensive oral health assessments and three-dimensional data collection, the accuracy and personalization of denture design are ensured. Based on the comparison and optimization of refined models, the adaptability and comfort of the design are guaranteed. Using numerically controlled machines for precise fabrication and assembly improves the stability and functionality of the dentures, enhancing the patient's usage experience. Through automation and digital technologies, manual errors and operational complexity are reduced.

[0048] In some embodiments of the present application, the optical measurement includes X-ray films or oral scans, and the oral scan uses three-dimensional scanning.

[0049] In some embodiments of the present application, when preparing an impression for the user to be based on a preset material, the preset material includes alginate impression material.

[0050] In some embodiments of the present application, when obtaining a three-dimensional digital model of the impression based on a scanning device, it includes: scanning the impression using a digital scanner.

[0051] It is understandable that by using X-rays to image the oral structure, information about tooth loss, bone conditions, and jawbone structure is provided, assisting in the assessment of the patient's oral health status and the feasibility of denture design. Through oral scanning technology, a three-dimensional scanning device is used to obtain three-dimensional data of the patient's oral cavity, precisely recording every detail inside the oral cavity, including the morphology of teeth, alveolar bone, jawbone, etc., to obtain a high-quality three-dimensional digital model. The three-dimensional scan data has higher accuracy and richer information content. Compared with traditional two-dimensional images, it can provide more accurate basic data for the precise design and subsequent fabrication of dentures. Alginate (such as sodium alginate or calcium alginate) is a material used for oral impressions, having good fluidity and setting properties. The alginate material quickly solidifies after coming into contact with oral tissues, forming a high-precision impression that replicates the internal structure of the oral cavity, ensuring the production of an accurate impression. Using a digital scanner to scan the impression generates an accurate three-dimensional digital model. The digital scanner obtains the geometric morphology of the impression surface through high-precision optical or laser scanning technology and converts it into a digital signal, generating point cloud data or a three-dimensional mesh model. Compared with traditional manual measurements or two-dimensional images, digital scanning can precisely record every detail of the impression, capturing every minute morphological change or complex structure completely.

[0052] In some embodiments of the present application, when obtaining a refined model by comparing the three-dimensional digital model with the oral three-dimensional model, it includes: obtaining the similarity between the three-dimensional digital model and the oral three-dimensional model, comparing the similarity with a similarity threshold, and obtaining the refined model according to the comparison result.

[0053] Specifically, when the similarity is greater than or equal to the similarity threshold, the three-dimensional oral model is used as the refined model. When the similarity is less than the similarity threshold, the refined model is obtained based on the three-dimensional oral model and the three-dimensional digital model.

[0054] In some embodiments of the present application, when obtaining the refined model based on the three-dimensional oral model and the three-dimensional digital model, it includes: aligning the three-dimensional oral model and the three-dimensional digital model based on the ICP algorithm, and through continuous iterative optimization, ensuring the maximum point cloud matching degree between the three-dimensional oral model and the three-dimensional digital model, and using the model composed of the point cloud as the refined model.

[0055] It can be understood that the introduction of the similarity threshold ensures that the three-dimensional oral model can be directly used when the model differences are small, thus avoiding unnecessary calculations and processes. For cases with large differences, the ICP algorithm can minimize errors through iterative optimization, ensuring the accuracy of the refined model. This not only improves the accuracy of complete denture design, effectively reduces manual intervention, but also improves the efficiency of automated design and production.

[0056] In some embodiments of the present application, when using CAD to determine the setting position of the fixed structural bar clasp in the complete denture with fixed structural bar clasp based on the refined model, it includes: comparing the refined model with the historical reference model, and determining the setting position of the fixed structural bar clasp according to the comparison result.

[0057] Specifically, when there is data in the historical reference model whose model similarity with the refined model is greater than or equal to the similarity threshold, the historical setting position corresponding to the historical reference model is used as the setting position of the fixed structural bar clasp. When the model similarities between the historical reference model and the refined model are both less than the similarity threshold, the setting position of the fixed structural bar clasp is obtained based on the convolutional neural network model. The historical reference model includes several historical refined models and several historical setting positions of the fixed structural bar clasp, and each historical refined model corresponds to a historical setting position of the fixed structural bar clasp.

[0058] In some embodiments of the present application, when obtaining the setting position of the fixed structural bar clasp based on the convolutional neural network model, it includes:

[0059] Dividing the historical reference model into a training set, a validation set, and a test set, training the CNN model based on the training set, tuning the model parameters based on the validation set, and evaluating the performance of the model based on the test set.

[0060] Using the backpropagation algorithm to update the model weights and minimizing the loss function through the Adam optimizer.

[0061] Determining the input data of the convolutional neural network model, where the input data includes the point cloud, surface mesh data, and three-dimensional geometric structure of the refined model.

[0062] Obtain the output result of the convolutional neural network model, and use the output result as the setting position of the fixed structural bar clip.

[0063] It can be understood that by combining historical data and convolutional neural network technology, the most suitable complete denture design can be automatically provided for patients. When the fine-tuned model has a high similarity with the historical reference model, using the historical setting position can greatly reduce the design time and improve efficiency; in the case of low similarity, the convolutional neural network can adaptively derive the optimal position of the fixed structural bar clip through deep learning technology. Combining big data and deep learning, making full use of historical data for intelligent design, improves the personalization and adaptability of complete dentures, while also reducing manual intervention and improving the accuracy and efficiency of the production process.

[0064] In the above embodiments, through the adoption of CAD / CAM technology, the personalized design and production of complete dentures are realized, solving the problem of difficult retention caused by problems such as low and flat alveolar ridges in traditional complete dentures. By comprehensively evaluating the oral health of users and obtaining a three-dimensional model of the oral cavity based on optical measurement, the oral data of each patient is made more accurate. Combining the impression made of the preset material and the three-dimensional digital model obtained by the scanning device, through comparison and optimization, a fine-tuned model is obtained to ensure the accuracy and adaptability of the design. Using CAD to optimize the setting position of the fixed structural bar clip according to the fine-tuned model, making it more in line with the oral anatomical structure of the patient, improving the retention force and comfort of the denture. Through CAM technology, the design scheme is transmitted to the numerical control machine tool for precise processing, ensuring the accuracy and quality of the denture.

[0065] In another preferred manner based on the above embodiments, refer to Figure 2 As shown, this embodiment provides a CAD / CAM fixed structural bar clip complete denture, which is prepared by using the preparation method of the above CAD / CAM fixed structural bar clip complete denture, and includes:

[0066] A base 100, provided with a first positioning groove 110 and a second positioning groove 120, and an artificial tooth 130 is arranged in the first positioning groove 110.

[0067] A fixing structure, including a fixing base body 210, a first fixing card slot 220 and a fixed structural bar clip 230. The fixed structural bar clip 230 corresponds to the second positioning groove 120, and the fixed structural bar clip 230 is clamped with the second positioning groove 120.

[0068] A base plate 300, provided with implants 310. There are several implants 310. The implants 310 correspond to the first fixing card slots 220, and the first fixing card slots 220 and the implants 310 are fixedly connected by bolts.

[0069] Specifically, the engagement of the first positioning groove 110 and the second positioning groove 120 on the base 100 with the structural rod clip 230 provides stable support and positioning, enabling the complete denture to fit closely to the oral cavity and avoiding denture displacement caused by alveolar bone resorption. The base plate 300 refers to the user's dental ridge. Implants 310 are implanted in the dental ridge. Through the cooperation of the first fixed card slot 220 and the implants 310, the fixation and durability of the denture are ensured by bolt connection, enhancing the overall stability of the denture. By combining positioning and engagement with implant fixation, the retention force of the complete denture is improved, solving the problems of adaptability and comfort in traditional designs.

[0070] It can be understood that by adopting CAD / CAM technology, the personalized design and fabrication of complete dentures are realized, solving the problem of difficult retention caused by shallow and low alveolar ridges and other problems in traditional complete dentures. By comprehensively evaluating the oral health of users and obtaining a three-dimensional model of the oral cavity based on optical measurement, the oral data of each patient is made more accurate. Combining the impression made of preset materials with the three-dimensional digital model obtained by the scanning device, through comparison and optimization, a refined model is obtained to ensure the accuracy and adaptability of the design. Using CAD to optimize the setting position of the structural rod clip according to the refined model to make it more in line with the oral anatomical structure of the patient, improving the retention force and comfort of the denture. Through CAM technology, the design scheme is transmitted to the numerical control machine tool for precise processing, ensuring the accuracy and quality of the denture.

[0071] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0072] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams can be implemented by computer program instructions, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more of the flows or multiple flows and / or blocks Figure 1 one or more of the blocks or multiple blocks.

[0073] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to work in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction device that implements the functions specified in one or more of the processes Figure 1 one or more of the processes and / or Figure 1 functions specified in one or more of the boxes.

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one or more of the processes Figure 1 one or more of the processes and / or Figure 1 functions specified in one or more of the boxes.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or make equivalent replacements, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A method for preparing a CAD / CAM fixed structure bar complete denture, characterized in that: include: Performing an examination and assessment on the user, including the oral health status, tooth loss, occlusion relationship and jaw condition; Acquire a three-dimensional model of the oral cavity of the user to be used based on optical measurement; Prepare an impression for the user based on a preset material; A three-dimensional digital model of the impression is obtained based on a scanning device, the three-dimensional digital model is compared with the three-dimensional model of the oral cavity to obtain a precision calibration model, and a setting position of a fixed structure bar in a fixed structure bar complete denture is determined by CAD according to the precision calibration model, and plan data is obtained; The scheme data is transmitted to a CNC machine tool, the fixed structure bar clamp is manufactured based on CAM, and the fixed structure bar clamp is assembled with a base to obtain a fixed structure bar clamp full denture.

2. The method for preparing a CAD / CAM fixed structure bar complete denture according to claim 1, characterized in that: The optical measurement includes an X-ray or an oral scan, and the oral scan is a three-dimensional scan.

3. The method for preparing a CAD / CAM fixed structure bar complete denture according to claim 1, characterized in that: When an impression is prepared for the user based on a preset material, the preset material includes an alginate impression material.

4. The method for preparing a CAD / CAM fixed structure bar complete denture according to claim 1, characterized in that: When the three-dimensional digital model of the impression is obtained based on a scanning device, it includes: The impression was scanned using a digital scanner.

5. The method for preparing a CAD / CAM fixed structure bar complete denture according to claim 1, characterized in that: When the three-dimensional digital model is compared with the three-dimensional model of the oral cavity to obtain a precision calibration model, it includes: Acquiring the similarity between the three-dimensional digital model and the three-dimensional model of the oral cavity, comparing the similarity with a similarity threshold, and acquiring the fine-calibration model according to the comparison result; When the similarity is greater than or equal to the similarity threshold, using the oral cavity three-dimensional model as the refined calibration model; When the similarity is less than the similarity threshold, the refined model is acquired according to the oral three-dimensional model and the three-dimensional digital model.

6. The method for preparing a CAD / CAM fixed structure bar complete denture according to claim 5, characterized in that: When the fine-calibration model is obtained according to the oral three-dimensional model and the three-dimensional digital model, it includes: The oral three-dimensional model is aligned with the three-dimensional digital model based on the ICP algorithm, and through continuous iterative optimization, the point cloud matching degree between the oral three-dimensional model and the three-dimensional digital model is ensured to be maximized, and the model composed of the point cloud is used as the precision calibration model.

7. The method for preparing a CAD / CAM fixed structure bar complete denture according to claim 6, characterized in that: When the setting position of the fixed structure bar in the fixed structure bar complete denture is determined by using CAD according to the precision calibration model, it includes: Comparing the fine-calibration model with the historical reference model, and determining the setting position of the fixed structure bar clamp according to the comparison result; When there is data in the historical reference model whose model similarity with the fine-calibration model is greater than or equal to a similarity threshold, the historical setting position corresponding to the historical reference model is used as the setting position of the fixed structure bar clamp; When the model similarities between the historical reference model and the fine-calibration model are both less than a similarity threshold, obtaining a setting position of the fixed structure rod clamp based on a convolutional neural network model; The historical reference model includes a plurality of historical precision calibration models and a plurality of setting positions of historical fixed structure rod clamps, and each of the historical precision calibration models corresponds to a setting position of a historical fixed structure rod clamp.

8. The method for preparing a CAD / CAM fixed structure bar complete denture according to claim 7, characterized in that: When obtaining the setting position of the fixed structure rod clamp based on the convolutional neural network model, it includes: Dividing the historical reference model into a training set, a validation set and a test set, training a CNN model based on the training set, tuning model parameters based on the validation set, and evaluating model performance based on the test set; Use the back-propagation algorithm to update the model weights and minimize the loss function using the Adam optimizer; Determining input data of the convolutional neural network model, the input data including point cloud, surface mesh data, and three-dimensional geometric structure of the fine-tuning model; The output result of the convolutional neural network model is obtained, and the output result is used as the setting position of the fixed structure rod clamp.

9. A CAD / CAM fixed structure bar clamp complete denture, prepared by the method for preparing a CAD / CAM fixed structure bar clamp complete denture according to any one of claims 1 to 8, characterized in that: include: A base is provided with a first positioning groove and a second positioning groove, wherein the artificial tooth is arranged in the first positioning groove; A fixed structure, comprising a fixed base, a first fixed slot and a fixed structure rod clamp, wherein the fixed structure rod clamp corresponds to the second positioning slot and is clamped with the second positioning slot; The base is provided with an implant, wherein a plurality of implants are provided, and the implants correspond to the first fixing slots, and the first fixing slots are fixedly connected to the implants by bolts.

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