Method and system for improving oral cavity digital data fitting accuracy by using noninvasive 3D modeling marking module

Abstract

The invention relates to a method and a system for improving oral cavity digital data fitting accuracy by using a noninvasive 3D modeling marking module. The method comprises the following steps: designing and obtaining a standardized marking module with a plurality of digital marking points on the surface through 3D modeling; non-invasively and reversibly adhering to the surface of an abutment which is used as an auxiliary reference system; the method comprises the following steps: acquiring oral cavity digital model data with a marking module after different intervention processing or in different data acquisition modes, detecting point-line-surface features of the marking module and preferentially matching, and default that corresponding data are overlapped and established in the same three-dimensional coordinate reference system to finish optimal fitting alignment; therefore, the digital data fitting accuracy of the oral cavity is improved; the marking module-assisted fitting method can be used for 1) comparing the accuracy of different digital data acquisition modes; 2) multi-unit temporary tooth data transfer errors are reduced; and (3) the acquisition error of the missing occlusion data of multiple teeth is reduced, so that the precise design of the target prosthesis is assisted.

Description

Technical Field

[0001] This invention relates to the field of digital oral medicine technology, and in particular to a method and system for improving the fitting accuracy of digital oral data using a non-invasive 3D modeling and marking module. Background Technology

[0002] In the field of prosthodontics, with the rapid development of digital technology, digital dental scanning technology is widely used in dental data acquisition and prosthetic design. However, significant errors can easily occur when comparing digital dental models with those obtained through traditional impression techniques to analyze errors, transferring multi-unit temporary tooth data to dental preparations to guide the final prosthetic design process, or transferring occlusal relationships when there are many missing teeth, too few remaining occlusal pairs, or poor identification.

[0003] However, in existing technologies, the reference area for model fitting and comparison often relies on manually selected residual tooth surfaces as markers for data fitting, and the differences in the selection of these markers often lead to errors during the fitting process. When the number of residual teeth is insufficient, or when the surfaces of the remaining teeth lack characteristic anatomical markers due to their smooth shape, it is difficult to select reproducible and reproducible markers for fitting and registration, resulting in reduced recognition of the reference area and extremely poor reproducibility. In such cases, the lack of a stable, unified, and reproducible standard three-dimensional coordinate reference system makes it easy to generate large errors in the fitting, registration, or comparison of the aforementioned digital model data. This not only affects the design accuracy of the final restoration but also adversely impacts the optimization of digital impression algorithms, occlusal relationships, and the accurate transfer of temporary tooth data, thus restricting further improvements in the accuracy and reliability of digital dental restoration technology.

[0004] In summary, there is currently a lack of auxiliary methods for processing digital oral model data to solve or partially solve the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology by providing a method and system for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module. This solves or partially solves the problems of insufficient remaining teeth or unclear surface features of remaining teeth making it impossible to select repeatable marking areas, unstable repeatability of existing reference areas, and lack of a stable and repeatable standard three-dimensional coordinate reference system, which leads to large errors in fitting comparison and affects the final restoration design and algorithm evaluation.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] One aspect of the present invention provides a method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module, comprising the following steps:

[0008] A method for improving the fitting accuracy of digital oral data using a non-invasive 3D modeling and marking module is characterized by the following steps:

[0009] One or more standardized marker modules with distinct characteristic points, lines, and surfaces are designed and obtained through 3D modeling, serving as digital marker points;

[0010] The one or more standardized marking modules are non-invasively and reversibly bonded to the surface of the abutment tooth, which serves as an auxiliary reference system, using light-cured dental fluid resin, while ensuring that the fluid resin does not encapsulate the characteristic point, line, and surface reference areas used for fitting and alignment.

[0011] Collect oral digital model data with the aforementioned marker module;

[0012] For oral digital model data obtained after various interventions or different data acquisition methods, the point, line, and surface regions of the corresponding reference marker modules are preferentially fitted and matched or aligned. By default, the corresponding data have been overlapped and established within the same three-dimensional coordinate reference system. One or more of the following processes are then performed:

[0013] 1) Compare the accuracy of oral digital model data under different data acquisition methods;

[0014] 2) Reduce errors in the transfer of temporary tooth data from multiple units to assist in the design and processing of target restorations;

[0015] 3) Reduce the error in occlusal data acquisition for multiple missing teeth, and assist in the design and processing of target restorations.

[0016] As a preferred technical solution, the process of comparing the accuracy of oral digital model data under different data acquisition methods includes the following steps:

[0017] The standardized marking module is non-invasively and reversibly fixed to the surface of the abutment tooth to obtain intraoral dentition data or dentition data with tooth preparation and digital model data of multiple adjacent teeth with standardized marking modules.

[0018] By identifying the point, line, and surface features of the marker module, for oral digital model data acquired through different data acquisition methods, the point, line, and surface features of the corresponding reference marker module are preferentially fitted (a software algorithm that can preferentially match and fit the feature points, lines, and surfaces of the selected area), and the corresponding data are overlapped and established within the same three-dimensional coordinate reference system; for example, based on the plaster model posterior chamber scan digital model data and intraoral digital scan model data acquired through traditional impressions, the error comparison of hard and soft tissues of the teeth between different model data acquisition methods is calculated, realizing the accuracy comparison of different model data acquisition methods.

[0019] As a preferred technical solution, the process of reducing data transfer errors of multi-unit temporary teeth and assisting in the design of target restorations includes the following steps:

[0020] The standardized marking module was fixed to the surface of the abutment tooth, and digital model data of the dentition with the marking module were obtained respectively in the state of wearing temporary tooth and the state of tooth preparation after tooth preparation.

[0021] For model data obtained from multiple intervention methods, the point, line and surface features of the standardized labeling module are detected and identified for priority fitting and alignment. Then, the multi-source data are overlapped and established within the same repeatable three-dimensional coordinate reference system to complete the best fitting and alignment.

[0022] After fitting or alignment, the digital model data of the oral cavity with temporary teeth is overlapped and fitted with the acquired dental preparation data in the same virtual space. The temporary tooth data is then transferred and connected to the dental preparation. Based on the existing dental arch and shape data of the temporary teeth, it is digitally replicated to the design of the final target restoration to assist in the design of the target restoration.

[0023] As a preferred technical solution, the various intervention methods include wearing a stable and adaptable temporary tooth and a tooth preparation in the same position without a temporary tooth.

[0024] As a preferred technical solution, the dental arch and morphological data include the labial projection of temporary teeth, incisal length, lingual inclination, midline position, and distribution of occlusal contact points.

[0025] As a preferred technical solution, the process of reducing occlusal data acquisition errors in cases of multiple missing teeth and assisting in the design and processing of target restorations includes the following steps:

[0026] The standardized marking module is fixed to the surface of the remaining abutment teeth on both sides of the upper and lower dentition to obtain digital model data of the tooth preparation body and multiple adjacent teeth with marking modules in the oral cavity.

[0027] The three-dimensional spatial relative position of the mandibular marker point relative to the maxillary marker point after the patient's centric occlusion is obtained by oral scanning, which serves as occlusal data. High-precision identification of occlusal abutment teeth is achieved by setting a standardized marker module.

[0028] By using standardized marking modules for both the upper and lower jaws and occlusal data with marked points, priority fitting and matching are performed on the areas of the standardized marking modules to obtain the relative positional occlusal relationship of the upper and lower jaws.

[0029] Another aspect of the present invention provides a system for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module, for implementing the aforementioned method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module, the system comprising:

[0030] One or more standardized marking modules are designed through 3D modeling and have one or more standardized marking modules with obvious characteristic points, lines and surfaces. These modules are used as digital marking points. The one or more standardized marking modules are non-invasively and reversibly bonded to the surface of the abutment tooth as an auxiliary reference system using light-cured dental fluid resin, while ensuring that the fluid resin does not cover the characteristic point, line and surface reference area used for fitting and alignment.

[0031] The data acquisition module is used to collect oral digital model data with a labeling module obtained after different interventions or different data acquisition methods;

[0032] The priority fitting and registration module is used to perform priority fitting and registration or alignment of the point, line and surface regions of the corresponding reference marker module for oral digital model data obtained after various interventions or different data acquisition methods. By default, the corresponding data have been overlapped and established in the same three-dimensional coordinate reference system to complete the best fitting and alignment.

[0033] The data processing module is used to perform one or more of the following processes:

[0034] 1) Compare the accuracy of oral digital model data under different data acquisition methods;

[0035] 2) Reduce errors in the transfer of temporary tooth data from multiple units to assist in the design and processing of target restorations;

[0036] 3) Reduce the error in occlusal data acquisition for multiple missing teeth, and assist in the design and processing of target restorations.

[0037] As a preferred technical solution, the cross-section of the standardized marking module is trapezoidal, with the long side of the trapezoid corresponding to the crown direction and the short side corresponding to the root direction.

[0038] As a preferred technical solution, the trapezoid is approximately an isosceles trapezoid with a side length of 2.8 mm, a longer base length of 2 mm, and a shorter base length of 1.5 mm.

[0039] As a preferred technical solution, the cross-section of the standardized marking module is rectangular or triangular.

[0040] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0041] (1) Improve the accuracy of fitting and comparison and reduce errors: In the design of oral restoration, due to insufficient number of remaining teeth or smooth surfaces, lack of characteristic anatomical markers, difficulty in selecting repeatable markers, and lack of a stable three-dimensional coordinate reference system, the model fitting and comparison error is large. This invention adopts a standardized marker module with point, line and surface features on the design surface. After 3D printing, it can be non-invasively and reversibly bonded to adjacent teeth in the restoration area. By identifying the point, line and surface features of the marker module, the marker module area is fitted first. Then, the corresponding data overlaps and is established in the same three-dimensional coordinate reference system, thereby improving the fitting accuracy of oral digital data, reducing errors, and providing a reliable foundation for restoration design and digital impression algorithm optimization.

[0042] (2) Reduce the error of data transfer and replication of multiple temporary teeth to improve the aesthetic and functional consistency of restorations: In the process of data transfer and fitting of multiple transitional restorations and tooth preparations, the lack of a unified reference leads to insufficient accuracy in the transfer of key data such as protrusion and length. This invention uses a standardized marking module as a reference to match the data of transitional restorations and tooth preparations in the same three-dimensional coordinate system. This allows for the accurate transfer of the aesthetic and functional data of temporary restorations (including but not limited to labial protrusion, incisal length, lingual inclination, midline position, occlusal contact point distribution, etc.) to the tooth preparations, which helps guide the final restoration fabrication and improves the aesthetic and functional consistency of the restorations.

[0043] (3) Reduce the error in occlusal data acquisition for multiple missing teeth in the mouth and assist in the design of occlusal restorations: For patients with multiple missing teeth, there are often problems such as insufficient remaining tooth units, insufficient number of occlusal pairs, excessive missing tooth range, difficulty in identifying occlusal teeth, poor crown height or atypical shape of remaining teeth, and difficulty in natural matching and accurate and effective transfer of occlusal relationship. This invention constructs a virtual three-dimensional coordinate reference system by standardizing and adding a marking module, collects marked maxillary and mandibular and occlusal data and matches them based on the system, increases the recognition of the remaining dentition of the maxillary and mandibular teeth, reduces errors, and realizes accurate confirmation and transfer of occlusal relationship in three-dimensional space.

[0044] (4) The cross-section of the standardized marking module is trapezoidal, with the long side of the trapezoid corresponding to the crown direction and the short side corresponding to the root direction, which can reduce the impact of the undercut of the marking module on traditional impressions and oral digital scanning. Attached Figure Description

[0045] Figure 1 This is a flowchart illustrating a method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module, as shown in the embodiment.

[0046] Figure 2 This is a schematic diagram of a system that uses a non-invasive 3D modeling and marking module to improve the fitting accuracy of digital oral data in an embodiment.

[0047] Figure 3 This is a schematic diagram of the standardized marking module in the embodiment;

[0048] Figure 4 This is a schematic diagram of the standardized marking module (known size) being bonded to the surface of the abutment tooth in the embodiment;

[0049] Figure 5 This is a schematic diagram of the oral digital model data with a marking module in the embodiment;

[0050] Figure 6 This is a schematic diagram comparing the accuracy of different model data acquisition methods in the embodiments. Detailed Implementation

[0051] 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, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] Example 1

[0053] During the fitting and comparison of digital models for oral restoration design, the number of remaining teeth (natural teeth, crown and bridge restorations, or implant-supported restorations) is often insufficient, or the surface of the remaining teeth is smooth and lacks characteristic anatomical landmarks. It is impossible to select repeatable landmarks, and the repeatability of the existing selected reference areas is unstable. There is a lack of a stable and repeatable standard three-dimensional coordinate reference system, resulting in large errors. This leads to certain errors in the fitting and comparison, affecting the design of the final restoration and the evaluation of the algorithm.

[0054] To address the aforementioned issues, this embodiment provides a method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling marking module. This method involves designing a 3D-printed standardized marking module (its size is known and can serve as a reference scale; its bonding is reversible and can be non-invasively removed after scanning or traditional impression taking) that is temporarily bonded to the surface of the remaining tooth / abutment tooth on the adjacent tooth (the 2nd or 3rd adjacent tooth) in the restoration area. This artificially constructs a repeatable three-dimensional reference coordinate system, thereby reducing errors in the fitting and comparison process of different models during the digital design of oral restorations.

[0055] See Figure 1 The method includes the following steps:

[0056] Step S1: Design and obtain one or more standardized marking modules with multiple digital marking points (i.e. multiple edges and multiple corners) on the surface through 3D modeling.

[0057] Step S2 involves non-invasively and reversibly bonding one or more standardized marking modules to the surface of the abutment tooth, which serves as an auxiliary reference system, using light-cured dental fluid resin. The fluid resin must not encapsulate the characteristic point, line, or surface reference areas used for fitting and alignment. The bonding effect is as follows: Figure 4 As shown.

[0058] Step S3: Collect digital oral cavity model data with marker modules; the scan results are as follows. Figure 5 As shown, this includes two standardized marking modules that are respectively placed on the two abutment teeth on both sides of the oral cavity.

[0059] Step S4: Based on the digital oral model data, a virtual, standardized, and repeatable three-dimensional coordinate reference system is constructed by detecting the point, line, and surface features of the marker module. By fitting the collected digital oral model data (point-to-point, line-to-line, and line-angle-to-line-angle fitting), data that is completely fitted to all areas except the working tooth region is obtained.

[0060] Preferably, step S4 performs error analysis on the hard / soft tissue of the tooth. Specifically, based on the acquired digital oral scanning model with a marker module and traditional impression model data (post-perfusion scanning of the model), the errors between the hard and soft tissue data of one or more teeth obtained from the digital oral model and the model obtained by traditional impression techniques (plaster model data obtained by traditional impression techniques such as silicone rubber or alginate) are compared and contrasted for scientific research and subsequent optimization of the digital impression algorithm.

[0061] Step S5: For new oral digital model data acquired after multiple interventions or through multiple data acquisition methods, after fitting or aligning the point, line, and surface feature regions of the corresponding reference marker modules, all data are overlapped and established within the same three-dimensional coordinate reference system to achieve optimal fitting and alignment, and one or more of the following processes are performed:

[0062] 1) Compare the accuracy of oral digital model data under different data acquisition methods;

[0063] 2) Reduce errors in the transfer of temporary tooth data from multiple units to assist in the design and processing of target restorations;

[0064] 3) Reduce the error in occlusal data acquisition for multiple missing teeth, and assist in the design and processing of target restorations.

[0065] Specifically, for processing 1), which is used to compare the accuracy of different data acquisition methods, the following steps are included:

[0066] A) Fix the marker module to the surface of the abutment tooth to obtain digital model data of the tooth preparation and multiple adjacent teeth with the marker module attached.

[0067] B) By detecting and identifying the point, line, and surface features of the marker module, for oral digital model data acquired through different data acquisition methods (such as traditional silicone rubber impressions, digital dental scanning, or plaster model scanning), the point, line, and surface feature regions of the corresponding reference marker module are optimized, fitted, and aligned. It is then assumed that the different data have overlapped and established within the same repeatable three-dimensional coordinate reference system to achieve optimal fitting and alignment. Specifically, the priority fitting uses existing software algorithms to prioritize matching and fitting the feature points, lines, and surfaces of the selected region.

[0068] C) Based on the reference model data and the oral digital model data, calculate the error comparison of hard and soft tissues of the teeth between different model data acquisition methods, and realize the accuracy comparison under different model data acquisition methods. See Figure 6 This is a schematic diagram showing the accuracy comparison results of two different model data acquisition methods.

[0069] The above processing can compare / compare the errors between the hard tissue data of a single tooth or multiple teeth obtained from the digital oral model and the model obtained from traditional impression techniques (plaster model data obtained from traditional impression techniques such as silicone rubber or alginate). It can also be used to compare / compare the errors between the soft tissue data such as gingival papillae, gingival margins, gingiva in the pontine area, alveolar ridge gingiva in the edentulous area, and palatal morphology obtained from the digital oral model and the model obtained from traditional impression techniques (plaster model data obtained from traditional impression techniques such as silicone rubber or alginate). This is used for scientific research and optimization of digital impression algorithms.

[0070] Specifically, for processing 2), which is used for data transfer of temporary teeth in multi-unit restorations to assist in the design of target restorations, the specific steps include:

[0071] A) Fix the marker module to the surface of the abutment tooth to obtain digital model data of the tooth preparation and multiple adjacent teeth with the marker module attached.

[0072] B) For model data of different intervention methods (with stable and adaptable temporary teeth and tooth preparations in the same tooth position without temporary teeth), by detecting and identifying the point, line and surface features of the marker module, and optimizing and fitting the point, line and surface feature regions of the corresponding reference marker module, it is assumed that the above different data have been overlapped and established in the same repeatable three-dimensional coordinate reference system to complete the best fitting and alignment.

[0073] C) At this point, the data of the temporary tooth and the tooth preparation data are overlapped and fitted in the same virtual space. This allows us to obtain data in which the shape of the temporary tooth and the shape of the tooth preparation are completely overlapped in the same space. In other words, the temporary tooth data can be accurately transferred and matched to the tooth preparation. Based on the existing dentition and shape data of the temporary tooth (including but not limited to labial protrusion, incisal length, lingual inclination, midline position, distribution of occlusal contact points, etc.), it can be digitally replicated to the design of the final target restoration. This reduces the deviation in the replication of multi-unit temporary teeth (over- or under-occlusion, angular deviation) caused by the lack of a reference system and the lack of endpoints and reference points in the traditional process of transferring multi-unit temporary tooth data, which leads to deviations in the final crown restoration design.

[0074] The above process can match and fit the patient's already adapted aesthetic / functional temporary restoration data with the intraoral tooth preparation data in the same standard three-dimensional coordinate reference system. This allows the patient's already adjusted temporary restoration data (including but not limited to labial projection, incisal length, lingual inclination, midline position, occlusal contact point distribution, etc.) to the tooth preparation data more accurately, which can be used to assist in guiding the fabrication of the final restoration.

[0075] Specifically, for processing 3), which is used for transferring occlusal data in multi-unit edentulous areas to assist in the design of target restorations, the following steps are included:

[0076] A) Fix the marking module to the surface of the remaining abutment teeth on both sides of the upper and lower dentition (ensuring that the bonding of the marking module does not interfere with the patient's occlusion), and obtain digital model data of the tooth preparations of the upper and lower dentition and multiple adjacent teeth with the marking module attached.

[0077] B) After the patient has centric occlusion, the three-dimensional spatial relative position of the mandibular marker point to the maxillary marker point is obtained by oral scanning.

[0078] C) The dental data with marked modules on the upper and lower jaws are fitted with the above-mentioned occlusal data with marked points. Priority fitting and matching is performed on the marked module area (a software algorithm) to obtain the relative positional occlusal relationship of the upper and lower jaws, thereby increasing the sensitivity and accuracy of occlusal relationship recognition.

[0079] The above process can address scenarios where patients have a large number of missing teeth, poor remaining crown height, and atypical remaining dentition shape, making natural matching impossible. By introducing a marker module (marker point), the recognizability of the remaining upper and lower dental arches is increased, and a repeatable three-dimensional coordinate system is constructed, which helps to accurately confirm and transfer the occlusal relationship in three-dimensional space.

[0080] Patients with multiple missing teeth often have insufficient remaining tooth units, insufficient number of occlusal pairs, and difficulty in identifying occlusal teeth due to excessive missing tooth area. In such cases, adding a marking module allows the maxillary and mandibular models with marked points to assess the three-dimensional positional relationship of the virtual three-dimensional system constructed from point, line, and surface feature regions. To a certain extent, this can amplify the recognition sensitivity of occlusal abutment teeth and avoid the problem of failure to identify occlusal contact teeth during oral digital scanning when there are insufficient remaining teeth, which leads to oral occlusal data transfer errors.

[0081] Example 2

[0082] Based on Example 1, this example provides a system for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module, used to implement the oral digital model data processing method of Example 1. See [link to example]. Figure 2 The system includes:

[0083] (1) One to three standardized marking modules are designed through 3D modeling and obtained as one or more standardized marking modules with obvious characteristic points, lines, and surfaces. These modules serve as digital marking points. The one or more standardized marking modules are non-invasively and reversibly bonded to the surface of the abutment tooth, which serves as an auxiliary reference system, using light-cured dental fluid resin, ensuring that the fluid resin does not encapsulate the characteristic point, line, and surface reference areas used for fitting and alignment. Preferably, see [reference]. Figure 3 The standardized marking module has a trapezoidal cross-section, with the longer side corresponding to the crown direction and the shorter side corresponding to the root direction. The module can also be a cuboid, cube, or triangular pyramid, etc. The length, width, height, and angles of this marking module are known and can be used as a reference scale for three-dimensional spatial coordinates. See also... Figure 4 In this example, the trapezoid is approximately an isosceles trapezoid with a side length of 2.8 mm, a longer base length of 2 mm, and a shorter base length of 1.5 mm.

[0084] (2) Data acquisition module, used to acquire oral digital model data with a labeling module after different intervention treatments (such as data of temporary teeth and dental preparations) or different data acquisition methods (such as oral digital model data obtained by scanning plaster models obtained by traditional silicone rubber / alginate impression method).

[0085] (3) Priority Fitting and Registration Module: For oral digital model data obtained after various interventions or different data acquisition methods, the corresponding reference marker module’s point, line and surface feature regions are prioritized for fitting and matching or alignment. By default, the corresponding data have been overlapped and established in the same three-dimensional coordinate reference system to complete the best fitting and alignment.

[0086] (4) Data processing module, used to perform one or more of the following processes:

[0087] 1) Compare the accuracy of oral digital model data under different data acquisition methods.

[0088] This method is used to obtain reference model data corresponding to single / multiple tooth impressions in the oral cavity. The common marker point modules are preferentially fitted and registered and then overlapped to establish a three-dimensional coordinate reference system. Based on the reference model data and the oral digital model data, the data errors of hard tissue (tooth preparation, remaining teeth, restorations, implant-supported restorations, etc.) and soft tissue (including gingival papilla, gingival margin, pontine area gingiva, alveolar ridge gingiva in edentulous area and palatal soft tissue) between the model data are evaluated to achieve model data comparison.

[0089] 2) Reduce the error of transferring temporary tooth data from multiple units and assist in the design and processing of target restorations.

[0090] This method is used to acquire data on multi-unit temporary restorations that have been adapted for aesthetic / functional coordination within the oral cavity, as well as data on multiple tooth preparations within the oral cavity. The common marker point module is first fitted and registered, and then overlapped to establish a three-dimensional coordinate reference system. Subsequently, the adjusted temporary restoration data is registered with the tooth preparation data of the same tooth position to guide the fabrication of the final target restoration based on the shape of the existing temporary restoration. This avoids transfer errors caused by the lack of precise reference points for the registration of temporary tooth data and tooth preparations due to too many temporary tooth units, which would ultimately affect the accuracy of the restoration fabrication and design.

[0091] 3) Reduce the error in occlusal data acquisition for multiple missing teeth, and assist in the design and processing of target restorations.

[0092] In scenarios where patients have a large number of missing teeth, poor remaining crown height, and atypical shapes of the remaining teeth, making natural matching and fitting impossible, a marker module (marker points) is introduced to increase the recognition of remaining teeth in the upper and lower dental arches. This allows for the registration and fitting of upper and lower dentition data onto the same dimensional coordinate system, thus assisting in the accurate confirmation and transfer of occlusal relationships in three-dimensional space. Patients with multiple missing teeth often have insufficient remaining tooth units, insufficient occlusal pairs, and excessively large missing tooth areas, making occlusal tooth recognition difficult. In such cases, adding a marker module allows the upper and lower jaw models with marker points to assess the point, line, and surface feature regions, constructing a virtual three-dimensional system of 3D positional relationships. To a certain extent, this can amplify the recognition sensitivity of occlusal abutment teeth, avoiding the problem of occlusal contact tooth recognition failure during oral digital scanning when there are insufficient remaining teeth, leading to oral occlusal data transfer errors.

[0093] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module, characterized in that, Includes the following steps: One or more standardized marker modules with distinct characteristic points, lines, and surfaces are designed and obtained through 3D modeling, serving as digital marker points; The one or more standardized marking modules are non-invasively and reversibly bonded to the surface of the abutment tooth, which serves as an auxiliary reference system, using light-cured dental fluid resin, while ensuring that the fluid resin does not encapsulate the characteristic point, line, and surface reference areas used for fitting and alignment. Collect dental digital model data with labeled modules obtained after different interventions or different data collection methods; For oral digital model data obtained after various interventions or different data acquisition methods, the point, line, and surface regions of the corresponding reference marker modules are preferentially fitted and matched or aligned. By default, the corresponding data have been overlapped and established within the same three-dimensional coordinate reference system to achieve the best fit and alignment. One or more of the following processes are then performed: 1) Compare the accuracy of oral digital model data under different data acquisition methods; 2) Reduce errors in the transfer of temporary tooth data from multiple units to assist in the design and processing of target restorations; 3) Reduce the error in occlusal data acquisition for multiple missing teeth, and assist in the design and processing of target restorations.

2. The method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module according to claim 1, characterized in that, The process of comparing the accuracy of oral digital model data under different data acquisition methods includes the following steps: The standardized marking module is non-invasively and reversibly fixed to the surface of the abutment tooth to obtain intraoral dentition data or dentition data with tooth preparation and digital model data of multiple adjacent teeth with standardized marking modules. By identifying the point, line, and surface features of the marker module, for oral digital model data acquired by different data acquisition methods, the point, line, and surface features of the corresponding reference marker module are preferentially fitted, and the corresponding data are overlapped and established within the same three-dimensional coordinate reference system. Based on the plaster model posterior chamber scan digital model data and intraoral digital scan model data acquired by traditional impressions, the error comparison of hard and soft tissues of the teeth between different model data acquisition methods is calculated, so as to realize the accuracy comparison of different model data acquisition methods.

3. The method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module according to claim 1, characterized in that, The process of reducing data transfer errors of multiple temporary teeth and assisting in the design of target restorations includes the following steps: The standardized marking module was fixed to the surface of the abutment tooth, and digital model data of the dentition with the marking module were obtained respectively in the state of wearing temporary tooth and the state of tooth preparation after tooth preparation. For model data obtained from multiple intervention methods, the point, line and surface features of the standardized marking module are detected and identified, and then fitted and aligned first. The multi-source data are then overlapped and established within the same repeatable three-dimensional coordinate reference system. After fitting or alignment, the digital model data of the oral cavity with temporary teeth is overlapped and fitted with the acquired dental preparation data in the same virtual space. The temporary tooth data is then transferred and connected to the dental preparation. Based on the existing dental arch and shape data of the temporary teeth, it is digitally replicated to the design of the final target restoration to assist in the design of the target restoration.

4. The method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module according to claim 3, characterized in that, The various intervention methods include wearing a stable and adaptable temporary tooth and a tooth preparation in the same position without a temporary tooth.

5. The method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module according to claim 3, characterized in that, The dental arch and morphological data include the labial projection of temporary teeth, incisal length, lingual inclination, midline position, and distribution of occlusal contact points.

6. The method for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module according to claim 1, characterized in that, To reduce errors in occlusal data acquisition for multiple missing teeth and to assist in the design and processing of target restorations, the process includes the following steps: The standardized marking module is fixed to the surface of the remaining abutment teeth on both sides of the upper and lower dentition to obtain digital model data of the tooth preparation body and multiple adjacent teeth with marking modules in the oral cavity. The three-dimensional spatial relative position of the mandibular marker point relative to the maxillary marker point after centric occlusion is obtained by oral scanning and used as occlusal data. High-precision identification of occlusal abutment teeth is achieved by setting a standardized marker module. By using standardized marking modules for both the upper and lower jaws and occlusal data with marked points, priority fitting and matching are performed on the areas of the standardized marking modules to obtain the relative positional occlusal relationship of the upper and lower jaws.

7. A system for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module, characterized in that, For implementing the method of improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module as described in any one of claims 1-6, the system comprises: One or more standardized marking modules are designed through 3D modeling and have one or more standardized marking modules with obvious characteristic points, lines and surfaces. These modules are used as digital marking points. The one or more standardized marking modules are non-invasively and reversibly bonded to the surface of the abutment tooth as an auxiliary reference system using light-cured dental fluid resin, while ensuring that the fluid resin does not cover the characteristic point, line and surface reference area used for fitting and alignment. The data acquisition module is used to collect oral digital model data with a labeling module obtained after different interventions or different data acquisition methods; The three-dimensional coordinate reference system construction module is used to prioritize fitting and matching or align the point, line and surface regions of the corresponding reference marker module for oral digital model data obtained after various interventions or different data acquisition methods. By default, the corresponding data have been overlapped and established in the same three-dimensional coordinate reference system. The data processing module is used to perform one or more of the following processes: 1) Compare the accuracy of oral digital model data under different data acquisition methods; 2) Reduce errors in the transfer of temporary tooth data from multiple units to assist in the design and processing of target restorations; 3) Reduce the error in occlusal data acquisition for multiple missing teeth, and assist in the design and processing of target restorations.

8. A system for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module according to claim 7, characterized in that, The standardized marking module has a trapezoidal cross-section, with the long side of the trapezoid corresponding to the crown direction and the short side corresponding to the root direction.

9. A system for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module according to claim 8, characterized in that, The trapezoid is approximately an isosceles trapezoid with a side length of 2.8 mm, a longer base length of 2 mm, and a shorter base length of 1.5 mm.

10. A system for improving the fitting accuracy of oral digital data using a non-invasive 3D modeling and marking module according to claim 7, characterized in that, The cross-section of the standardized marking module is rectangular or triangular.

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