CN111861887A - Method and system for detecting forming quality of dental crown and storage medium - Google Patents
Method and system for detecting forming quality of dental crown and storage medium Download PDFInfo
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Abstract
The application relates to the field of dental crown quality detection, in particular to a method, a system and a storage medium for detecting the forming quality of a dental crown, wherein the method comprises the following steps: s01: carrying out three-dimensional scanning on the dental crown to be detected to obtain three-dimensional data to be detected; s02: preprocessing the three-dimensional data to be detected to obtain a preprocessing model; s03: detecting and comparing the pretreatment model to obtain a detection result; s04: and judging whether the crown to be detected is qualified or not according to the detection result. The dental crown part detection device can realize efficient detection of dental crown parts and has the advantages of high accuracy, high efficiency and the like.
Description
Technical Field
The present application relates to the field of dental crown quality detection, and in particular, to a method, a system, and a storage medium for detecting dental crown forming quality.
Background
The manufacturing industry is the basic industry and the important pillar of national economic development, and the development level of the manufacturing industry marks the economic strength, the technological level, the living standard and the national defense strength of a country. Developed countries such as the United states, Germany and Japan realize industrialization, modernization and informatization of the countries by virtue of strong manufacturing industry systems, and monopolize high-end equipment manufacturing technologies for a long time. With continuous deepening of innovation, the manufacturing industry of China also meets new opportunities, domestic cheap raw materials and labor force attract a large amount of external enterprise investment, particularly after WTO is successfully added, the economic development of China is driven into a motorway, manufacturing enterprises in Europe, America and other countries flourish and build processing bases, the flourishing and development of the economy of China are greatly promoted, the pace of going away from the manufacturing of China is accelerated, and the market competitiveness and the international status of China are promoted.
In an additive manufacturing enterprise, particularly in the manufacturing process of a metal dental crown part, quality detection needs to be carried out on the part subjected to printing and forming; the method mainly detects the size of the part, whether the edge and the surface are smooth, whether the edge has cracks, spheroidization, warping deformation or hole depression and the like; after the detection result is obtained, the production process can be improved and perfected correspondingly aiming at various defects, and the printing quality of the part is improved. In order to master the parameter data of the morphological characteristics, the traditional method at home and abroad is to perform surface observation through visual inspection or by means of some tools (such as vernier calipers, magnifying glasses, microscopes, projectors and the like) and testing equipment (such as a contourgraph, a scanning electron microscope and the like) and to perform human eye identification and judgment by means of skilled people with abundant experience.
Aiming at the related technologies, the inventor thinks that the defects of large labor intensity, high labor cost, low detection efficiency, high subjective factor, low detection precision, incapability of realizing real-time rapid full detection and the like exist in manual detection.
Disclosure of Invention
In order to realize efficient detection of dental crown parts, the application provides a method, a system and a storage medium for detecting the forming quality of the dental crown.
In a first aspect, the application provides a method for detecting the forming quality of a dental crown, which adopts the following technical scheme:
A method for detecting the forming quality of a dental crown comprises the following steps:
s01: carrying out three-dimensional scanning on the dental crown to be detected to obtain three-dimensional data to be detected;
s02: preprocessing the three-dimensional data to be detected to obtain a preprocessing model;
s03: detecting and comparing the pretreatment model to obtain a detection result;
s04: and judging whether the crown to be detected is qualified or not according to the detection result.
By adopting the technical scheme, the preprocessing model containing the three-dimensional data to be detected is detected and compared, whether the dental crown to be detected is qualified or not is judged according to the detection result, the high-efficiency detection on the dental crown part can be realized, and the method has the advantages of high accuracy, high efficiency and the like.
Preferably, the three-dimensional scanning is performed on the dental crown to be detected to obtain three-dimensional data to be detected, and the three-dimensional data includes:
and capturing high-resolution two-dimensional images of the crown to be detected from different angles by adopting a three-dimensional scanning system based on structured light, and synthesizing the three-dimensional images to obtain three-dimensional data to be detected.
By adopting the technical scheme, the three-dimensional scanning system based on the structured light is favorable for improving the image precision of scanning, and further the overall detection precision is improved.
Preferably, the preprocessing according to the three-dimensional data to be detected to obtain a preprocessing model includes:
generating a scanning dental crown model according to the three-dimensional data to be detected, and superposing the scanning dental crown model and a preset standard dental crown model to obtain the preprocessing model.
By adopting the technical scheme, the scanning dental crown model and the standard dental crown model are superposed to obtain the pretreatment model, so that the scanning dental crown model is detected and compared by taking the standard dental crown model as a standard in the subsequent steps.
Preferably, after generating the scanned crown model according to the three-dimensional data to be detected, the method further comprises:
the structured light scan surface of the scanned crown model is smoothed using bilateral filtering noise reduction, then a surface normal map is created from the smoothed mesh, and high-pass filtering is used to extract and estimate the high-frequency details of the normal.
By adopting the technical scheme, bilateral filtering noise reduction is adopted, so that smooth structured light scanning surface is facilitated; and a surface normal map is created from the smooth grid, and high-pass filtering is adopted to extract and estimate high-frequency details of the normal, so that the accuracy of scanning the dental crown model is further improved, and the overall detection accuracy is further improved.
Preferably, the overlapping the scanned dental crown model with a preset standard dental crown model to obtain the pre-treatment model comprises:
scaling the scanned crown model or the standard crown model so that they are represented in the same cell; and translating or rotating the scanning dental crown model or the standard dental crown model, and finishing the superposition of the two models by using an iterative closest point algorithm to obtain the preprocessing model.
By adopting the technical scheme, one model of the scanning dental crown model or the standard dental crown model is used as a reference, the other model is subjected to scaling in the same proportion, then the two models are overlapped by using the iteration closest point algorithm through translation or rotation, a foundation is provided for subsequent detection and comparison, the iteration closest point algorithm is adopted for overlapping, the precision of the preprocessing model can be improved, and the overall detection precision is further improved.
Preferably, the scaling the scanned crown model or the standard crown model comprises:
selecting the exact elements visible in the scanned crown model and the standard crown model, measuring the distance D1 between two specific points on one of the models, and then measuring the distance D2 between the corresponding two specific points on the other model; calculating the scale factor Sf = D1/D2 and applying the scale factor Sf on the further model.
By adopting the technical scheme, one of the scanning dental crown model or the standard dental crown model is used as a reference, the other model is scaled in the same proportion, so that the standard dental crown model can be better matched with the scanning dental crown model and is subjected to subsequent superposition and contrast detection.
Preferably, the detecting and comparing the preprocessing model to obtain a detection result includes:
extracting features from the point cloud of the pre-processing model, providing feedback of standard deviation, tolerance or distribution, and obtaining a detection result containing the standard deviation, tolerance or distribution.
By adopting the technical scheme, the characteristics corresponding to the scanned dental crown model and the standard dental crown model are respectively extracted from the point cloud of the preprocessed model, and the comparison and detection are carried out according to methods such as standard deviation, tolerance or distribution, so that the defects existing in the scanned dental crown model can be favorably detected, and the method can be used for professional personnel to analyze and provide the improvement suggestion of the production process.
Preferably, the detecting and comparing the preprocessing model to obtain a detection result includes:
and obtaining color mapping from the surface or contour comparison of the pre-treatment model and the standard dental crown model for detection and comparison to obtain a detection result.
By adopting the technical scheme, the surface or the contour of the preprocessed model and the standard dental crown model are detected and compared by utilizing a three-dimensional color mapping method in automatic three-dimensional detection software (such as Geomagic Control), so that the defects of the scanned dental crown model can be detected, and professionals can analyze the defects and propose an improvement suggestion of the production process.
In a second aspect, the application provides a detection system for dental crown forming quality, which adopts the following technical scheme:
a system for detecting quality of crown formation, comprising:
three-dimensional scanning system: the device is used for performing three-dimensional scanning on the dental crown to be detected to obtain three-dimensional data to be detected;
a preprocessing module: the system is used for preprocessing the three-dimensional data to be detected to obtain a preprocessing model;
a detection module: the preprocessing model is used for detecting and comparing to obtain a detection result;
a judging module: and the dental crown detection device is used for judging whether the dental crown to be detected is qualified or not according to the detection result.
By adopting the technical scheme, the preprocessing model containing the three-dimensional data to be detected is detected and compared, whether the dental crown to be detected is qualified or not is judged according to the detection result, the high-efficiency detection on the dental crown part can be realized, and the method has the advantages of high accuracy, high efficiency and the like.
In a third aspect, the present application provides a computer-readable storage medium, which adopts the following technical solutions:
a computer readable storage medium storing a computer program that can be loaded by a processor and executed to perform any of the above methods of crown forming quality detection.
By adopting the technical scheme, the preprocessing model containing the three-dimensional data to be detected is detected and compared, whether the dental crown to be detected is qualified or not is judged according to the detection result, the high-efficiency detection on the dental crown part can be realized, and the method has the advantages of high accuracy, high efficiency and the like.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the device can realize the high-efficiency detection of the dental crown part and has the advantages of high accuracy, high efficiency and the like;
2. the quality detection result of the dental crown part can be stored and analyzed, and the quality detection result can be further used for proving that the produced product meets the required specification.
Drawings
FIG. 1 is a flow chart of the detection method of the present application.
FIG. 2 is a system block diagram of the detection system of the present application.
Description of reference numerals: 1. a three-dimensional scanning system; 2. a preprocessing module; 3. a detection module; 4. and a judging module.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
In the related technology, the detection of the forming quality of the metal dental crown produced by three-dimensional printing needs accurate positioning coordinates and angle information, the manual mode is adopted for detection, the time and the labor are wasted, the detection precision is low, the product quality cannot be rapidly detected in the manual mode, and an electronic quality management system cannot be accurately and timely brought in. Before the forming quality of the metal dental crown produced by three-dimensional printing is detected, the printed metal dental crown needs to be placed on a platform after being removed and supported, and then subsequent scanning and detection are carried out.
Example 1
The embodiment of the application discloses a method for detecting the forming quality of a dental crown. Referring to fig. 1, the method for detecting the quality of the crown formation includes the steps of:
s01: carrying out three-dimensional scanning on the dental crown to be detected to obtain three-dimensional data to be detected;
in the embodiment, a structured light-based three-dimensional scanning system is adopted to capture high-resolution two-dimensional images of the crown to be detected from different angles and synthesize a three-dimensional image to obtain three-dimensional data to be detected; the blue light is used as a light source of the three-dimensional scanning system based on the structured light; because blue light has physical properties of short wavelength and high energy, the blue light can bring many advantages when being used as a light source of the three-dimensional scanning system, and the biggest advantage is that the blue light has higher interference resistance which is superior to white light, can resist ambient light which is disordered, and enables the three-dimensional scanning system to be normally used in the environment disordered condition; because the sensor of the camera is easily interfered by external invisible light, and the problem that the optical filter arranged in the three-dimensional scanning system taking blue light as a light source can well process the interference is solved, the defect of a white light scanning system is just made up. Blue light three-dimensional scanning system is higher for white light three-dimensional scanning system work efficiency, and blue light far than white light penetrability is strong, under the complicated condition of luminous environment, can see through the intensity that compound light promoted the light source, need not carry out extinction processing and surface cleaning degree to the object that is scanned to reduce the preparation time before the scanning, from preparing the link save time by a wide margin, promote efficiency.
S02: preprocessing three-dimensional data to be detected to obtain a preprocessing model;
s03: detecting and comparing the pretreatment model to obtain a detection result;
in this embodiment, the detection may be performed directly on the crown to be detected through a graphical user interface, the 3D inspection may be performed using a 3D measurement Application Programming Interface (API) remote access and using the point clouds, the default method of calculating the distance between the two point clouds in the point cloud extraction is the "nearest neighbor distance"; the purpose of API development is to provide a Graphical User Interface (GUI) to allow users to establish and control communication lines with Web-enabled devices; the API allows users to view or measure or manipulate parts through the Machine Vision System (MVS), webcam, and "remote desktop" provided by Microsoft Windows; the current 3D measurement API uses point clouds to perform 3D checks to measure geometric elements of the crown to be detected, such as contours, surfaces, boundaries, etc.
S04: judging whether the crown to be detected is qualified or not according to the detection result; the processing technology requirements can be used as a comparison standard, and the detection result is compared with the processing technology requirements so as to judge whether the crown to be detected is qualified, wherein the processing technology requirements comprise tolerance requirements, contour requirements and the like.
Example 2
The difference between this embodiment and embodiment 1 is that step S02 specifically includes the following steps:
generating a scanning dental crown model according to the three-dimensional data to be detected, and superposing the scanning dental crown model and a preset standard dental crown model to obtain a pretreatment model.
Example 3
The difference between this embodiment and embodiment 1 is that step S02 specifically includes the following steps:
generating a scanning crown model according to three-dimensional data to be detected, smoothing a structured light scanning surface of the scanning crown model by adopting bilateral filtering noise reduction, then creating a surface normal map from a smooth grid, and extracting and estimating high-frequency details of a normal by adopting high-pass filtering; and overlapping the scanned dental crown model with a preset standard dental crown model to obtain a pretreatment model.
Example 4
The difference between this embodiment and embodiment 1 is that step S02 specifically includes the following steps:
generating a scanning crown model according to the three-dimensional data to be detected, and scaling the scanning crown model or the standard crown model so that the scanning crown model or the standard crown model can be represented in the same unit; and translating or rotating the scanned dental crown model or the standard dental crown model, and finishing the superposition of the two models by using an iterative closest point algorithm to obtain a pretreatment model.
Example 5
The difference between this embodiment and embodiment 1 is that step S02 specifically includes the following steps:
generating a scanning crown model according to the three-dimensional data to be detected, and selecting accurate elements such as contours, edges, surfaces or other elements visible in the scanning crown model and the standard crown model; measuring the distance D1 between two specific points (e.g. two marginal points of the crown) on one of the models (e.g. the scanning crown model) and then measuring the distance D2 between two corresponding specific points on the other model (e.g. the standard crown model) on a larger scale; calculating the scale factor Sf = D1/D2 and applying the scale factor Sf to the other model, scaling the scanned crown model and the standard crown model to the same scale so that they are represented in the same cell; and translating or rotating the scanned dental crown model or the standard dental crown model, and finishing the superposition of the two models by using an iterative closest point algorithm to obtain a pretreatment model.
Example 6
The difference between this embodiment and embodiment 1 is that step S02 specifically includes the following steps:
generating a scanning crown model according to three-dimensional data to be detected, smoothing a structured light scanning surface of the scanning crown model by adopting bilateral filtering noise reduction, then creating a surface normal map from a smooth grid, and extracting and estimating high-frequency details of a normal by adopting high-pass filtering; selecting the exact elements visible in the scanned crown model and the standard crown model, measuring the distance D1 between two specific points on one of the models, and then measuring the distance D2 between the corresponding two specific points on the other model; calculating the scale factor Sf = D1/D2 and applying the scale factor Sf to the other model, scaling the scanned crown model and the standard crown model to the same scale so that they are represented in the same cell; and translating or rotating the scanned dental crown model or the standard dental crown model, and finishing the superposition of the two models by using an iterative closest point algorithm to obtain a pretreatment model.
Example 7
The difference between this embodiment and embodiment 1 is that step S03 specifically includes the following steps:
extracting features from the point cloud of the pre-processing model, providing feedback of standard deviation, tolerance or distribution, and obtaining a detection result containing the standard deviation, tolerance or distribution; for each point in the compared cloud (point cloud of scanned crown model), the API searches for the closest point in the reference cloud (point cloud of standard crown model) and calculates its euclidean distance.
Example 8
The difference between this embodiment and embodiment 1 is that step S03 specifically includes the following steps:
obtaining color mapping from the surface or contour comparison of the pre-processed model and the standard dental crown model for detection and comparison to obtain a detection result; the surface or the contour of the preprocessed model and the standard dental crown model are detected and compared by using a three-dimensional color mapping method in automatic three-dimensional detection software (such as Geomagic Control), so that the defects of the scanned dental crown model can be detected, and professional personnel can analyze the defects and propose an improvement suggestion of the production process.
The embodiment of the application also discloses a detection system for the forming quality of the dental crown. Referring to fig. 2, the system for detecting the quality of crown formation includes:
Three-dimensional scanning system 1: the device is used for performing three-dimensional scanning on the dental crown to be detected to obtain three-dimensional data to be detected;
the pretreatment module 2: the system comprises a preprocessing module, a data acquisition module, a data processing module and a data processing module, wherein the preprocessing module is used for preprocessing three-dimensional data to be detected to obtain a preprocessing model;
the detection module 3: the device is used for detecting and comparing the pretreatment model to obtain a detection result;
and a judging module 4: and is used for judging whether the crown to be detected is qualified or not according to the detection result.
The pretreatment method adopted by the pretreatment module 2 can adopt any one of the above-mentioned detection methods of the quality of crown formation, and the detection method adopted by the detection module 3 can adopt any one of the above-mentioned detection methods of the quality of crown formation.
The embodiment of the application also discloses a computer readable storage medium which stores a computer program which can be loaded by a processor and used for executing any one of the above methods for detecting the quality of the formed dental crown.
The quality detection results of the dental crown parts are stored and analyzed by using the computer-readable storage medium and can be further used for proving that the produced products meet the required specifications.
The computer-readable storage medium includes, for example: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A method for detecting the forming quality of a dental crown is characterized by comprising the following steps:
s01: carrying out three-dimensional scanning on the dental crown to be detected to obtain three-dimensional data to be detected;
s02: preprocessing the three-dimensional data to be detected to obtain a preprocessing model;
s03: detecting and comparing the pretreatment model to obtain a detection result;
s04: and judging whether the crown to be detected is qualified or not according to the detection result.
2. The method for detecting the forming quality of the dental crown according to claim 1, wherein the three-dimensional scanning is performed on the dental crown to be detected to obtain the three-dimensional data to be detected, and the method comprises the following steps:
and capturing high-resolution two-dimensional images of the crown to be detected from different angles by adopting a three-dimensional scanning system based on structured light, and synthesizing the three-dimensional images to obtain three-dimensional data to be detected.
3. The method for detecting the quality of the formed dental crown according to claim 1, wherein the preprocessing the three-dimensional data to be detected to obtain a preprocessed model comprises:
Generating a scanning dental crown model according to the three-dimensional data to be detected, and superposing the scanning dental crown model and a preset standard dental crown model to obtain the preprocessing model.
4. The method for detecting the quality of crown forming according to claim 3, characterized in that after generating the scanned crown model from said three-dimensional data to be detected, it further comprises:
the structured light scan surface of the scanned crown model is smoothed using bilateral filtering noise reduction, then a surface normal map is created from the smoothed mesh, and high-pass filtering is used to extract and estimate the high-frequency details of the normal.
5. The method for detecting the quality of the formed dental crown according to the claim 3, characterized in that the superposition of the scanned dental crown model and the preset standard dental crown model to obtain the pre-processed model comprises:
scaling the scanned crown model or the standard crown model so that they are represented in the same cell; and translating or rotating the scanning dental crown model or the standard dental crown model, and finishing the superposition of the two models by using an iterative closest point algorithm to obtain the preprocessing model.
6. The method for detecting the quality of crown forming according to claim 5, characterized in that said scaling said scan crown model or standard crown model comprises:
Selecting the exact elements visible in the scanned crown model and the standard crown model, measuring the distance D1 between two specific points on one of the models, and then measuring the distance D2 between the corresponding two specific points on the other model; calculating the scale factor Sf = D1/D2 and applying the scale factor Sf on the further model.
7. The method for detecting the quality of the formed dental crown according to claim 1, wherein the detecting and comparing the pre-processed model to obtain the detection result comprises:
extracting features from the point cloud of the pre-processing model, providing feedback of standard deviation, tolerance or distribution, and obtaining a detection result containing the standard deviation, tolerance or distribution.
8. The method for checking the quality of crown forming according to claim 1, characterized in that: the detecting and comparing the preprocessing model to obtain a detection result comprises:
and obtaining color mapping from the surface or contour comparison of the pre-treatment model and the standard dental crown model for detection and comparison to obtain a detection result.
9. A system for detecting the quality of crown formation, comprising:
Three-dimensional scanning system (1): the device is used for performing three-dimensional scanning on the dental crown to be detected to obtain three-dimensional data to be detected;
a pre-processing module (2): the system is used for preprocessing the three-dimensional data to be detected to obtain a preprocessing model;
detection module (3): the preprocessing model is used for detecting and comparing to obtain a detection result;
a judging module (4): and the dental crown detection device is used for judging whether the dental crown to be detected is qualified or not according to the detection result.
10. A computer-readable storage medium, characterized in that a computer program is stored which can be loaded by a processor and which performs a method for detecting the quality of a crown formation according to any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113607730A (en) * | 2021-08-03 | 2021-11-05 | 无锡乾鹏医疗科技有限公司 | Part detection method, device, terminal and readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113607730A (en) * | 2021-08-03 | 2021-11-05 | 无锡乾鹏医疗科技有限公司 | Part detection method, device, terminal and readable storage medium |
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