JP2021045277A - Technical material identification system - Google Patents

Abstract

To provide a technical material identification system capable of easily identifying which patient a completed technical material belongs to.SOLUTION: A technical material identification system 100 has a reference shape data acquisition unit 101 for acquiring reference shape data, an identification object technical material shape data acquisition unit 103 for acquiring identification object technical material shape data, and a similarity determination unit 105 for determining similarity between a first feature amount based on the reference shape data with a second feature amount based on the identification object technical material shape data by comparing them.SELECTED DRAWING: Figure 2

Description

The present invention relates to a technical product identification system, specifically, a technique for identifying which patient the completed dental technical product belongs to.

Conventionally, most dental technicians (hereinafter, also simply referred to as technicians) are created based on a dental model. Typically, a patient's tooth pattern is collected at a dental clinic and a dental model is created based on the tooth pattern. The dental model is sent to the dental laboratory (hereinafter simply referred to as the laboratory) together with information that can identify the patient. The laboratory builds a technical product with wax on a dental model, and takes a mold of this wax-made technical product to make a mold. A technical product is obtained by pouring a material such as metal into this mold.

The laboratory may receive orders for the production of technical products for different patients at the same time. At this time, if those technical products are of the same part and the same material, it may be difficult to identify which patient the completed technical product belongs to. This is because the patient name cannot be entered in the technical product. In such a case, the laboratory may identify the completed technical object by matching it with the dental model like a puzzle. Since the patient name can be entered in the dental model, the correspondence between the technical product and the patient can be confirmed through the dental model.

On the other hand, recently, a method has been proposed in which a dental clinic orders a technical product by passing intraoral scan data without creating a dental model (see Patent Documents 1 and 2).

JP-A-2017-006651 Japanese Patent Application Laid-Open No. 2019-511293

When creating a technical product based on intraoral scan data, it is not always necessary to manufacture a dental model, so there is a possibility that an ordering form that does not use a dental model will increase from the viewpoint of cost reduction and the like. In addition, even when a dental model is produced as in the conventional case, the dental model is often damaged in the process of producing a technical product. In such a case, it is not possible to identify the technical product by matching it with the dental model like a puzzle. Therefore, it is desired to provide a method for identifying the correspondence between the completed technical product and the patient even if the dental model does not exist.

The present invention has been made to solve such a problem, and provides a technical product identification system capable of easily identifying which patient the completed dental technical product belongs to. The purpose.

The technical product identification system according to the embodiment of the present invention includes a reference shape data acquisition unit that acquires reference shape data, an identification target technical product shape data acquisition unit that acquires identification target technical product shape data, and the reference shape. It has a similarity determination unit for determining the similarity between the first feature amount based on the data and the second feature amount based on the identification target technical object shape data.
In the technical product identification system according to the embodiment of the present invention, the reference shape data is either the shape data in the oral cavity, the design data of the technical product, or the shape data of the standard technical product.
In the technical product identification system according to the embodiment of the present invention, the shape data storage unit that stores the reference shape data and the patient's identifier in association with each other, and the patient's that is associated with the reference shape data. It further has an output unit that extracts and outputs an identifier from the shape data storage unit according to the degree of similarity.
In the technical product identification system according to the embodiment of the present invention, the first feature amount and the second feature amount include information regarding the shape of the margin line.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a technical product identification system capable of easily identifying which patient the completed dental technical product belongs to.

It is a figure which shows an example of the hardware composition of the technical object identification system 100. It is a figure which shows an example of the functional structure of the technical object identification system 100. It is a figure which shows an example of the functional structure of the technical object identification system 100. It is a figure explaining the shape in the oral cavity. It is a figure which shows an example of the operation of the technical object identification system 100.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an example of the hardware configuration of the technical product identification system 100. The technical product identification system 100 includes a CPU 11, a ROM 12, a RAM 13, a non-volatile memory 14, a bus 10, and an input / output device 60.

The CPU 11 is a processor that controls the technical product identification system 100 as a whole. The CPU 11 reads the system program stored in the ROM 12 via the bus 10 and controls the entire technical product identification system 100 according to the system program.

The ROM 12 stores in advance a system program for executing various processes. The RAM 13 temporarily stores temporary calculation data, display data, data input by the user via the input / output device 60, a program, and the like.

The non-volatile memory 14 is backed up by, for example, a battery (not shown), and retains the storage state even when the power supply of the technical product identification system 100 is cut off. The non-volatile memory 14 stores data, programs, and the like input from the input / output device 60. The programs and data stored in the non-volatile memory 14 may be expanded in the RAM 13 at the time of execution and use.

The input / output device 60 is a data input / output device including a display, a key input interface, and the like. The input / output device 60 displays the information received from the CPU 11 on the display via the interface 18. The input / output device 60 passes commands, data, and the like input from the key input interface and the like to the CPU 11 via the interface 18.

In the present embodiment, it is assumed that the technical product identification system 100 is configured as a stand-alone information processing device, but the present invention is not limited to this, and for example, the above-mentioned hardware may be used. It may be realized by the cooperation of a plurality of information processing devices having each. For example, the technical product identification system 100 can also be configured by using cloud computing technology.

FIG. 2 is a block diagram showing an example of the functional configuration of the technical product identification system 100. The technical product identification system 100 includes a reference shape data acquisition unit 101, an identification target technical product shape data acquisition unit 103, a similarity determination unit 105, and a shape data storage unit 107.

The reference shape data acquisition unit 101 acquires the reference shape data. The reference shape data refers to shape data used as a reference when identifying a technical product (hereinafter, a technical product to be identified) whose identity is unknown. The reference shape data includes, for example, the shape data in the oral cavity of the patient (hereinafter, the shape data in the oral cavity), the design data of the technical product, and the technical product for which the patient's product is known (hereinafter, the standard technical product). Shape data (hereinafter referred to as standard technical product shape data) and the like are included.

The intraoral shape data is data showing the shapes of the upper and lower jaw teeth, the abutment teeth, and the voids formed between them in the open state of the oral cavity (hereinafter referred to as upper jaw data and lower jaw data). In addition, data showing the shape of the dentition in a state where the oral cavity is closed (engaged) (hereinafter referred to as upper and lower bite data) is included (see FIG. 4). The intraoral shape data is based on, for example, three-dimensional shape data such as STL (Standard Triangulated Language) data that can be acquired by an intraoral scanner, and two-dimensional image data acquired by roentgen or CT (Computed Tomography) scanning. It may be the constructed three-dimensional shape data. The reference shape data acquisition unit 101 inputs the intraoral shape data from an intraoral scanner, an X-ray apparatus, a CT scanning apparatus, or an arbitrary information processing apparatus that processes the data output by these. In addition, the reference shape data acquisition unit 101 accepts the input of the patient's identifier corresponding to the intraoral shape data.

The design data is three-dimensional shape data that defines the shape of the technical product, which is created based on the intraoral shape data. The design data is, for example, STL data, and is used when casting, shaving, or the like of a technical product. Typically, the laboratory or manufacturer creates design data based on the intraoral shape data obtained at the dental office. More specifically, the design data is completed by modifying the existing template based on the intraoral data. The reference shape data acquisition unit 101 acquires design data from a design device, an instruction issuing device capable of storing the design data, and the like. Further, the reference shape data acquisition unit 101 accepts the input of the patient's identifier corresponding to the design data.

The reference technical product includes, for example, a technical product in the process of processing, a dental model in which the shape of the patient's oral cavity is molded, and the like. The reference technology shape data is, for example, three-dimensional shape data that can be acquired by measuring the reference technology with a depth sensor that acquires depth information, two-dimensional image data that is acquired by photographing the reference technology with a camera, and the like. It may be three-dimensional shape data constructed based on. The reference shape data acquisition unit 101 inputs reference technology product shape data from a depth sensor, a camera, or an arbitrary information processing device that processes the data output by these. Further, the reference shape data acquisition unit 101 accepts the input of the patient's identifier corresponding to the reference technology shape data.

The identification target technical product shape data acquisition unit 103 acquires data indicating the shape of the identification target technical product (hereinafter, identification target technical product shape data). The technical object to be identified is a technical product for which it is unknown which patient it belongs to. The identification target technical product shape data acquisition unit 103 can acquire the identification target technical product shape data by the same method as when the reference shape data acquisition unit 101 acquires the reference technical product shape data.

The shape data storage unit 107 is a storage area for storing the intraoral shape data, the design data, the reference technical product shape data, and the identification target technical product shape data. Of these, the intraoral shape data, the design data, and the reference technical product shape data are usually stored in association with the patient identification information (name, identification number, etc.). The patient identification information shall be supplied together with the intraoral shape data, the design data and the reference technical structure shape data.

The similarity determination unit 105 inputs the shape data of the technical product to be identified, compares it with the intraoral shape data, the design data, or the standard technical product shape data stored in the shape data storage unit 107, and is similar to the two. Calculate the degree. The similarity determination unit 105 includes a feature extraction unit 1051, a comparison unit 1053, and an output unit 1055.

The feature extraction unit 1051 extracts the feature amount from the intraoral shape data, the design data or the reference technical product shape data, and the identification target technical product shape data. The feature amount in the present embodiment is a numerical value that quantitatively expresses the feature of the shape of the oral cavity, the design data, the reference technical product, and the technical product to be identified. For example, the coordinate values of the characteristic points included in the shape, the normal vector of the characteristic surface, and the like may be used as the feature amount, but any feature amount may be adopted without being limited to these.

It is desirable that the feature amount includes one indicating the shape of the margin line. The margin line is a virtual line showing the boundary surface between the tooth substance remaining after forming the abutment tooth (the tooth that becomes the base of the technical product) and the technical product. The margin line is an important feature that characterizes the shape of the technical object to be identified. The outer shape of the technical object is generally determined based on the shape of the abutment tooth included in the maxillary data or the mandibular data and the shape of the cavity that can be obtained from the upper and lower bite data. Typically, it can be determined substantially automatically by selecting the optimum shape pattern from several prepared shape patterns. Further, the shape of the occlusal surface of the technical object can be determined almost automatically by selecting the optimum shape from several shape patterns prepared in advance. However, the margin line, which is the root side of the technical product, varies greatly depending on the patient, and the dental technician designs it individually for each patient. It is possible to automatically design the margin line, but even in this case, there are individual differences in the shape. Therefore, the shape of the margin line can be a fingerprint-like feature that is unique.

For technical products (for example, insert teeth, crowns, inlays, etc.) that can be extracted using the margin line as a feature amount, the feature extraction unit 1051 extracts the feature amount indicating the shape of the margin line as described above with high accuracy. Similarity judgment is possible. For other technical products, the features of elements other than the margin line can be used. For example, the feature extraction unit 1051 includes the outer shape of the technical object (including the maintenance device), the shape of the void (distance between the teeth on both sides of the technical object, etc.), the shape in the oral cavity (the state of the ridge), and the occlusal fissure. It is possible to extract a feature amount indicating the shape (indicating the position of the groove, the degree of wear, etc.) of (the groove on the occlusal surface of the tooth). For example, in the case of removable partial dentures, the feature amount indicating the outer shape of the technical object including the maintenance device and the shape of the void, and in the case of full dentures, the feature amount indicating the intraoral shape (state of bulging gums of the maxilla and mandible), implant If there is, it is possible to extract a feature amount or the like indicating the shape or positional relationship of the implant base (indicating the distance to the adjacent tooth or another implant base). It should be noted that even if the technical product can use the feature amount of the margin line, the judgment may be performed using the feature amount other than the margin line. Alternatively, the feature amount of the margin line and other feature amounts may be used in combination.

The comparison unit 1053 compares the feature amount of the intraoral shape data, the design data or the reference technical product shape data with the feature amount of the identification target technical work shape data, and calculates the similarity. The degree of similarity between the design data or the reference technical product shape data and the identification target technical product shape data can be determined by a method of comparing the feature amounts of the outer shapes of the two. The intraoral shape data and the shape data of the technical object to be identified are, for example, a method of comparing the shape of a void in the oral cavity with the shape of the technical object to be identified, or an intraoral shape (such as a raised state) and a technical object. The similarity can be determined by a method of comparing with the shape of the contact surface of the oral cavity. Since various methods are known for determining the degree of similarity by comparing the features, detailed description thereof will be omitted here.

The output unit 1055 outputs the intraoral shape data or the reference technical product shape data determined to be similar to the identification target technical product shape data, and the patient identification information associated with these data. For example, among the intraoral shape data and the reference technical product shape data stored in the shape data storage unit 107, several data from the one with the highest degree of similarity may be displayed in a ranking format.

In addition, each of the above-mentioned processing units may be distributed and mounted in a plurality of information processing devices constituting the technical product identification system 100. For example, all the processing units may be mounted on a mobile information terminal such as a smartphone, or some or all of the processing units may be configured by virtual information processing resources using cloud computing technology.

The operation of the technical product identification system 100 will be described in chronological order using the flowchart of FIG.
S1: Acquisition of reference shape data The reference shape data acquisition unit 101 collects intraoral shape data, design data, and reference technology shape data, associates them with a patient identifier, and stores them in the shape data storage unit 107. The intraoral shape data can be acquired together with the instruction sheet via the instruction sheet issuing system, for example, when receiving an order for a technical product from a dental clinic. The reference technical product shape data may be acquired at a pre-stage of a situation where a plurality of patient's technical products are mixed, such as firing and washing, at a laboratory, for example.

S2: Acquisition of shape data of the technical object to be identified When it becomes unknown which patient the technical object belongs to, the identification target technical object shape data acquisition unit 103 is activated. The identification target technical product shape data acquisition unit 103 acquires the identification target technical product shape data.

S3: Similarity determination The similarity determination unit 105 collates the identification target technical object shape data acquired in S2 with the reference technical object shape data accumulated in S1 one by one, and determines the similarity.

S4: Output The output unit 1055 outputs the result of S3. For example, the patient identifier corresponding to the reference technical structure shape data determined to have the highest similarity is displayed. Alternatively, the patient identifiers corresponding to the reference technical structure shape data can be displayed in the ranking format in order from the one determined to have the highest degree of similarity. If necessary, an index or the like indicating the degree of similarity may be added.

According to the present embodiment, even in a situation where it is difficult to identify which patient the technical product belongs to, the technical product can be easily collated with the reference technical product shape data accumulated in the past. Can identify the patient corresponding to. Here, since the reference technical product shape data may be intraoral shape data, design data, or standard technical product shape data, an intraoral scanner was used even in the conventional manufacturing method using a dental model. Even if it is an automatic manufacturing method, it can be identified.

The present invention is not limited to the above-described embodiment, and may be arbitrarily modified as long as the gist of the present invention is not impaired. For example, in the above-described embodiment, a method of comparing any one of the intraoral shape data, the design data, or the reference technical product shape data with the identification target technical product shape data is mainly disclosed, but the present invention mainly discloses. Not limited to this. For example, a plurality of data among the intraoral shape data, the design data, or the reference technical product shape data may be compared with the identification target technical product shape data.

100 Technical product identification system 101 Reference shape data acquisition unit 103 Identification target technical product shape data acquisition unit 105 Similarity determination unit 1051 Feature extraction unit 1053 Comparison unit 1055 Output unit 107 Shape data storage unit

Claims (4)

The reference shape data acquisition unit that acquires the reference shape data, and
The identification target technical product shape data acquisition unit that acquires the identification target technical product shape data,
A technical product having a first feature amount based on the reference shape data and a second feature amount based on the identification target technical product shape data, and a similarity determination unit for determining the similarity between the two. Identification system. The technical product identification system according to claim 1, wherein the reference shape data is any of the shape data in the oral cavity, the design data of the technical product, and the shape data of the standard technical product. A shape data storage unit that stores the reference shape data in association with the patient's identifier, and
The technical product identification system according to claim 1, further comprising an output unit that extracts and outputs the patient's identifier associated with the reference shape data from the shape data storage unit according to the degree of similarity. The technical product identification system according to claim 1, wherein the first feature amount and the second feature amount include information on the shape of a margin line.

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