Digitization method for accurate duplication transfer and verification of in-place track

Abstract

The invention discloses a digital method for accurate duplication, transfer and verification of an in-place track, and belongs to the technical field of oral cavity restoration digitization. The method comprises the following steps: carrying out in-place path observation of a digital model in oral rehabilitation computer-aided design software, and generating an undercut filling model along the observation direction; constructing a parameterized three-dimensional feature model in reverse modeling software according to the undercut filling model; and automatically identifying the projection contour of the feature model through an algorithm, calculating the deviation angle between the current observation direction and the target in-position track, and guiding the model to observe and adjust. According to the invention, a track consistency verification system is constructed, accurate copying and transferring of the track direction are realized in a digital mode, the system can be adapted to dental restoration computer-aided design software with different function configurations, and a standardized and verifiable track digital transmission scheme is provided for clinical diagnosis and treatment of dental restoration.

Description

Technical Field

[0001] This invention belongs to the field of digital technology of dental restoration, specifically relating to a digital method for the replication, transfer and verification of the placement path of a prosthesis. Background Technology

[0002] In prosthodontics, proper placement path design is fundamental to ensuring good retention and stability of restorations. It effectively guides clinical tooth preparation, implant placement, and the overall structural design of the restoration, significantly improving long-term outcomes. Therefore, accurate recording and precise transfer of the placement path are crucial for the design and fabrication of restorations.

[0003] In removable partial prostheses for missing teeth, the path of insertion refers to the specific direction the prosthesis follows when positioned on the remaining alveolar ridge and abutment teeth. Its design requires comprehensive consideration of various factors, including retention, stability, support, aesthetics, and the health of the remaining teeth. Determining the optimal path of insertion through model observation is a crucial step in ensuring the effectiveness of the prosthesis. Furthermore, the path of insertion needs to be transferred between multiple stages, including diagnostic design, abutment tooth preparation, and prosthesis fabrication. Therefore, ensuring consistency of the path of insertion throughout the restoration process is of significant clinical importance.

[0004] In the field of implant restoration, the concept of the placement path has been expanded to include the digital planning and precise replication and transfer of the implant's placement direction. Restoration-oriented implant planning follows the principle of reverse design, using the ideal shape and position of the final restoration as a benchmark to deduce the optimal three-dimensional position and placement angle of the implant. A digital implant guide then precisely replicates and transfers the virtually planned placement direction to the surgical area. In implant-supported removable partial prostheses, the implant placement direction must remain parallel to the denture's placement path; however, this operation remains challenging in clinical practice.

[0005] Traditional methods for replicating and transferring the placement path are cumbersome and susceptible to subjective influences, failing to meet the precision and efficiency requirements of modern digital diagnostics. With the development of technologies such as optical 3D scanning and computer-aided design and manufacturing (CAD-CAM), researchers have proposed digital guide technology, which can precisely replicate and transfer the designed placement path into the patient's mouth. However, existing methods primarily achieve the replication and transfer of the placement path from the design software to the oral cavity, without establishing a reverse path for the precise transmission of the actual placement path direction from the oral cavity back to the design software. This may lead to deviations between the subsequent placement path and the initial placement path determined during the guide design stage, a problem prevalent in various restorative scenarios involving placement path replication and transfer. Furthermore, existing digital placement path replication and transfer methods lack intuitive visualization of the placement path direction, and the consistency of the transfer results has not been verified.

[0006] To address the aforementioned issues, this invention proposes a digital method for the precise replication, transfer, and verification of the insertion path. Its core technical principles can be widely applied in the field of dental restoration, which involves the need for precise replication and transfer of the insertion path. Summary of the Invention

[0007] The purpose of this invention is to provide a digital method for accurate replication, transfer, and verification of the in-situ track, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a digital method for precise replication, transfer, and verification of the placement path, adaptable to computer-aided design software for dental restorations with different functional configurations, including: a direct method and an indirect method, wherein the specific steps of the direct method are as follows: S1. Observe the model in the positioning path in the repair CAD software and obtain the model with the indentation filled along the observation direction. The bottom surface of the indentation filled model is perpendicular to the positioning path direction. S2. Import the indented model into the reverse modeling software Geomagic, construct the planar features and normal features of the bottom surface of the model. The direction of the normal indicates the direction of the positioning path of the model. Construct three cylindrical feature models with the positioning path as the central axis, with a diameter of 10 mm and a height of 15 mm. S3. Adjust the position of the cylindrical feature model so that it is located in front of, to the left of, and to the right of the indentation model, respectively, without affecting model observation and restoration design. Then merge the cylindrical feature model and the indentation model. S4. When observing the working model in the repair CAD software, import the indentation model with cylindrical features, and use the "align" function in the CAD software to align the working model and the indentation model. S5. Simultaneously rotate the working model and the indented model until the top surface of the cylindrical feature model is completely facing the screen, so that the projected outline of the feature model at the current observation angle is as close to a perfect circle as possible, without exposing the rest of the feature model. S6. Take a screenshot from the current observation angle. The screenshot should include the complete three cylindrical feature models. S7. Import the screenshot into the in-place track consistency verification system. The system will preprocess the screenshot, automatically identify the projection outline of the cylindrical feature model in the screenshot and make an initial judgment to provide analysis suggestions. Finally, a verification report and observation direction adjustment plan will be generated, including the angular deviation of the in-place track direction on the X-axis and Y-axis, so as to assist in the accurate transfer of the in-place track. This adjustment plan is for reference only.

[0009] The indirect method described herein has the following specific steps: S1. Observe the model in the positioning path in the repair CAD software and obtain the model with the indentation filled along the observation direction. The bottom surface of the indentation filled model is perpendicular to the positioning path direction. S2. Import the indented model into the reverse modeling software Geomagic, construct the planar features and normal features of the bottom surface of the model. The direction of the normal indicates the direction of the positioning path of the model. Construct three cylindrical feature models with the positioning path as the central axis, with a diameter of 10 mm and a height of 15 mm. S3. Import the working model into the reverse modeling software Geomagic, perform the best fit based on the morphological characteristics of the occlusal surface of the model, and register the spatial coordinates of the working model and the indentation model. S4. Transfer the cylindrical feature model to the working model and merge them; S5. In the repair CAD software, observe the working model with the cylindrical feature model, and adjust the observation angle of the working model until the top surface of the cylindrical feature model is completely facing the screen, so that the projected outline of the feature model at the current observation angle is as close to a perfect circle as possible, without exposing the rest of the feature model. S6. Take a screenshot from the current observation angle. The screenshot should include the complete three cylindrical feature models. S7. Import the screenshot into the in-place track consistency verification system. The system will preprocess the screenshot, automatically identify the projection outline of the cylindrical feature model in the screenshot and make an initial judgment to provide analysis suggestions. Finally, a verification report and observation direction adjustment plan will be generated, including the angular deviation of the in-place track direction on the X-axis and Y-axis, so as to assist in the accurate transfer of the in-place track. This adjustment plan is for reference only.

[0010] Compared with the prior art, the beneficial effects of the present invention are: By parameterizing the path of insertion into a three-dimensional feature model, the direction of insertion can be intuitively indicated, effectively connecting each stage of the digital restoration process and achieving precise replication and transfer of the path of insertion during restoration. Simultaneously, the results of the path of insertion transfer are verified, the deviation angle of the path of insertion is quantified, and adjustment schemes are provided, which can improve the accuracy of digital restoration design and fabrication. The core technical principle of this invention can be widely applied in the field of dental restoration involving the precise replication and transfer of the path of insertion. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the method of the present invention; Figure 2 The first step in the direct method of this invention is to determine the orientation diagram of the in-situ track by repairing CAD software (taking Dental System as an example); Figure 3 This is the first step in the direct method of the present invention, which generates a fill-in-concave model diagram based on the observed in-situ direction; Figure 4 The second step in the direct method of this invention involves constructing a fill-in-concave model feature map in the reverse modeling software Geomagic. Figure 5 This is a diagram illustrating the construction of a cylindrical feature model in the second step of the direct method of this invention. Figure 6 This is a diagram showing the third step of adjusting the position of the cylindrical feature model in the direct method of this invention; Figure 7 This refers to the fourth step in the direct method of this invention, which involves importing and aligning the inverted concave model diagram during the observation process of the working model; Figure 8 This is a diagram showing the adjustment of the observation angle of the working model in the fifth step of the direct method of this invention; Figure 9 This is a schematic diagram of the cylindrical feature model under the current observation angle in the sixth step of the direct method of this invention; Figure 10 This is a preprocessing diagram of the in-situ consistency verification system in the seventh step of the direct method of this invention; Figure 11 This is the seventh step of the verification system in the direct method of this invention, which automatically identifies the projected contour of the cylindrical feature model. Figure 12 This provides an initial judgment and analysis suggestion diagram for the seventh step verification system in the direct method of this invention. Figure 13 The seventh step of the direct method in this invention generates an observation report and adjustment suggestion diagram for the verification system. Figure 14 This is a schematic diagram of the third step in the indirect method of this invention, involving the registration working model and the inverted concave model in the reverse modeling software Geomagic. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Please see Figure 1-13 The present invention provides a technical solution: a digital method for accurate replication, transfer and verification of in-situ channels, comprising: a direct method and an indirect method; The direct method described herein has the following specific steps: First step, refer to Figure 2 As shown, the model was observed in place within the restoration CAD software, and a model with indentations filled along the observation direction was obtained, as follows. Figure 3 As shown, at this time, the bottom surface of the indented model is perpendicular to the direction of the placement path; The second step is to import the indented model into the reverse modeling software Geomagic, referring to... Figure 4As shown, the planar features and normal features of the bottom surface of the model are constructed. The direction of the normal indicates the orientation of the model's placement path. Figure 5 As shown, three cylindrical feature models are constructed with the in-place channel as the central axis, with a diameter of 10 mm and a height of 15 mm. Third step, refer to Figure 6 As shown, adjust the position of the cylindrical feature model so that it is located in front of, to the left of, and to the right of the indentation model, respectively, without affecting model observation and restoration design, and merge the cylindrical feature model and the indentation model. Step 4, refer to Figure 7 As shown, when observing the working model in the repair CAD software, the indentation model with cylindrical features is imported, and the "align" function in the CAD software is used to align the working model and the indentation model. Step 5, refer to Figure 8 As shown, the working model and the indented model are rotated synchronously until the top surface of the cylindrical feature model is completely facing the screen, so that the projected outline of the feature model at the current observation angle is as close to a perfect circle as possible, without exposing the rest of the feature model. Step 6, refer to Figure 9 As shown, the screenshot taken from the current observation angle should include the complete three cylindrical feature models. Step 7, refer to Figure 10 As shown, the screenshot is imported into the in-situ consistency verification system. The system will preprocess the screenshot, such as... Figure 11 , 12 As shown, the system will automatically identify the projected outline of the cylindrical feature model in the screenshot and make an initial judgment to provide analysis suggestions. Finally, it will generate a verification report and an observation direction adjustment plan, such as... Figure 13 As shown, this includes the angular deviation of the positioning track direction on the X and Y axes, thereby assisting in the precise transfer of the positioning track. This adjustment scheme is for reference only. The indirect method described herein has the following specific steps: First step, refer to Figure 2 As shown, the model was observed in place within the restoration CAD software, and a model with indentations filled along the observation direction was obtained, as follows. Figure 3 As shown, at this time, the bottom surface of the indented model is perpendicular to the direction of the placement path; The second step is to import the indented model into the reverse modeling software Geomagic, referring to... Figure 4 As shown, the planar features and normal features of the model's bottom surface are constructed, with the normal direction indicating the model's placement path direction, such as... Figure 5 As shown, three cylindrical feature models are constructed with the in-place channel as the central axis, with a diameter of 10 mm and a height of 15 mm. Third step, refer to Figure 14As shown, the working model is imported into the reverse modeling software Geomagic, and the best fit is performed based on the morphological characteristics of the occlusal surface of the model to register and unify the spatial coordinates of the working model and the indentation model. Fourth step: Transfer the cylinder feature model to the working model and merge them; Fifth, observe the working model with the cylindrical feature model in the repair CAD software, adjust the observation angle of the working model until the top surface of the cylindrical feature model is completely facing the screen, and the subsequent steps are the same as the direct method.

[0014] Working principle: The orientation of the in-place path is parameterized into a three-dimensional cylindrical feature model, which serves as an intermediary for the replication and transfer of the in-place path; The system automatically identifies the projected contour of the cylindrical feature model in the screenshot through algorithms such as image preprocessing, contour filtering and circle fitting, enhances the robustness of the verification system, evaluates its roundness, fits the center of the circle and calculates the deviation angle of the positioning path, and generates an observation angle adjustment scheme for reference. Parametrically converting the path of insertion into a solid model can expand its applicability and effectively connect various stages of the digital restoration process. Its core technical principles can be widely applied in the field of dental restoration that involves the precise replication and transfer of the path of insertion.

[0015] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0016] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A digital method for precise replication, transfer, and verification of in-situ tracks, characterized in that... It is compatible with computer-aided design software for dental restorations with different functional configurations, including: direct method and indirect method; the direct method is suitable for restoration design software that can import and align other digital models during model observation, and the specific steps are as follows: S1. Observe the model in the positioning path in the repair CAD software and obtain the model with the indentation filled along the observation direction. The bottom surface of the indentation filled model is perpendicular to the positioning path direction. S2. Import the indented model into the reverse modeling software Geomagic, construct the planar features and normal features of the bottom surface of the model. The direction of the normal indicates the direction of the positioning path of the model. Construct three cylindrical feature models with the positioning path as the central axis, with a diameter of 10 mm and a height of 15 mm. S3. Adjust the position of the cylindrical feature model so that it is located in front of, to the left of, and to the right of the indentation model, respectively, without affecting model observation and restoration design. Then merge the cylindrical feature model and the indentation model. S4. When observing the working model in the repair CAD software, import the indentation model with cylindrical features, and use the "align" function in the CAD software to align the working model and the indentation model. S5. Simultaneously rotate the working model and the indented model until the top surface of the cylindrical feature model is completely facing the screen, so that the projected outline of the feature model at the current observation angle is as close to a perfect circle as possible, without exposing the rest of the feature model. S6. Take a screenshot from the current observation angle. The screenshot should include the complete three cylindrical feature models. S7. Import the screenshot into the in-place track consistency verification system. The system will preprocess the screenshot, automatically identify the projection outline of the cylindrical feature model in the screenshot and make an initial judgment to provide analysis suggestions. Finally, a verification report and observation direction adjustment plan will be generated, including the angular deviation of the in-place track direction on the X-axis and Y-axis, so as to assist in the accurate transfer of the in-place track. This adjustment plan is for reference only.

2. A digital method for precise replication, transfer, and verification of in-situ tracks based on the method described in claim 1, characterized in that... It is compatible with computer-aided design software for dental restorations with different functional configurations; the indirect method described above is applicable to restoration design software that does not have the above-mentioned functions, and the specific steps are as follows: S1. Observe the model in the positioning path in the repair CAD software and obtain the model with the indentation filled along the observation direction. The bottom surface of the indentation filled model is perpendicular to the positioning path direction. S2. Import the indented model into the reverse modeling software Geomagic, construct the planar features and normal features of the bottom surface of the model. The direction of the normal indicates the direction of the positioning path of the model. Construct three cylindrical feature models with the positioning path as the central axis, with a diameter of 10 mm and a height of 15 mm. S3. Import the working model into the reverse modeling software Geomagic, perform the best fit based on the morphological characteristics of the occlusal surface of the model, and register the spatial coordinates of the working model and the indentation model. S4. Transfer the cylindrical feature model to the working model and merge them; S5. In the repair CAD software, observe the working model with the cylindrical feature model, and adjust the observation angle of the working model until the top surface of the cylindrical feature model is completely facing the screen, so that the projected outline of the feature model at the current observation angle is as close to a perfect circle as possible, without exposing the rest of the feature model. S6. Take a screenshot from the current observation angle. The screenshot should include the complete three cylindrical feature models. S7. Import the screenshot into the in-place track consistency verification system. The system will preprocess the screenshot, automatically identify the projection outline of the cylindrical feature model in the screenshot and make an initial judgment to provide analysis suggestions. Finally, a verification report and observation direction adjustment plan will be generated, including the angular deviation of the in-place track direction on the X-axis and Y-axis, so as to assist in the accurate transfer of the in-place track. This adjustment plan is for reference only.

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