JP2009195495A - Dental device for measuring color - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dental device for measuring color capable of selecting color information of a dental filling material. <P>SOLUTION: This device comprises a memory means for memorizing a color measuring information obtained by a color sample of a denture mold and a therapy supporting information including the cavity information and the above dental filling material information according to the site information belonging to the cavity, an image data acquisition means for obtaining the image data of dentine of a patient, a site setting means 81 for setting a site of a comparative object, a comparative information extracting means 82 for extracting the color measuring information, which is memorized in association with the site information corresponding to the comparative site, from the memory means, a dentine information extracting means 83 for extracting the color measuring information related to the object site from the dentine image data of the patient, a color comparative means 84 for comparing the color measuring information of the dental mold color sample with the color measuring information of the dentine of the patient, and an information selecting means 85 for selecting at least one dental mold color sample from the comparative result and at least one therapy supporting information memorized by the memory means corresponding to the selected color measuring information. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dental colorimetric apparatus that assists in selecting a dental filler when performing a filling treatment on a cavity formed in a patient's tooth.

Conventionally, a composite resin has been used as a dental filler for filling a cavity formed in a tooth by caries or the like. When filling the composite resin, for example, the doctor visually compares the color of the patient's tooth with the color of the color sample, and selects the color sample having the color closest to the patient's tooth. Each color sample is provided with a table that specifies the recommended combination color of the composite resin to be filled, and the doctor selects the color of the composite resin to be filled with reference to the table corresponding to the selected color sample and treats it. Do. Here, the color sample is, for example, a material in which different colored ceramics are processed into a tooth shape.
In addition, in order to reduce the burden on the doctor related to the selection of the color sample as described above, the color selection of the dental filler is supported by providing the function of automatically selecting the color sample that most closely matches the color of the tooth. The technique to do is proposed (for example, refer patent document 1).

  In Patent Document 1, a number of reference templates composed of a combination of a number of different layer thicknesses and color schemes are photographed, and numerical values relating to predetermined parameters obtained from the obtained image data are stored in a database. A color determination device that measures and determines the layer structure of the dental filler based on the image of the patient's tooth by comparing the color data of the patient's tooth and the color data of the reference template stored in the database Has been proposed.

JP 2002-90223 A

  However, using only the reference template accumulated based on the image data acquired from the color sample of the plane accurately simulates the state where the dental filling material is actually filled in the cavity formed in the patient's tooth. There is a disadvantage that it is not possible to select an appropriate dental filler. In other words, when filling a cavity formed in a tooth with a dental filler, there is an interface based on the material difference between the bottom, sidewall and dental filler of the cavity, so that the inside of the tooth is transmitted. The scattered light is scattered, reflected, or refracted at the interface, and a color that cannot be expressed simply by using the reference template is generated. For this reason, even if treatment is performed using the selected dental filler, treatment traces may be conspicuous, contrary to expectations.

  The present invention has been made to solve the above problems, and provides a dental colorimetric device capable of selecting information on a dental filler suitable for the color of a tooth of a patient having a cavity. Objective.

In order to solve the above problems, the present invention employs the following means.
The present invention provides colorimetric information acquired from a tooth-shaped color sample whose cavity has been repaired with a dental filler, and treatment support information including information on the cavity and information on the dental filler. A part for setting a target part for comparing the storage means for storing information in association with the image, the image data acquisition means for acquiring image data of the patient's teeth, and the color of the tooth of the patient and the color of the tooth type color sample Setting means; comparison information extracting means for extracting from the storage means the colorimetric information stored in association with the information of the part to which the cavity corresponds to the target part set by the part setting means; Tooth information extraction means for extracting colorimetric information on the target part based on the image data of the patient's tooth acquired by the image data acquisition means, and the tooth type color sample extracted by the comparison information extraction means Color comparison means for comparing the colorimetric information with the colorimetric information of the patient's tooth extracted by the tooth information extraction means, and the colorimetric information of at least one tooth type color sample based on the comparison result by the color comparison means And a dental colorimetric device comprising information selection means for selecting at least one treatment support information stored in the storage means in association with the selected colorimetric information.

  According to the present invention, when the target part for color comparison is set by the part setting unit, the tooth-type color sample stored in the storage unit in association with the information of the part to which the cavity corresponding to the target part belongs Colorimetric information is extracted by the comparison information extraction unit, and the colorimetric information of the extracted tooth mold color sample and the colorimetric measurement of the patient's tooth extracted from the image data of the patient's tooth acquired by the image data acquisition unit Information is compared with the color comparing means. As a result of the comparison, at least one tooth-type color sample colorimetric information is selected by the information selecting unit, and at least one treatment support information stored in the storage unit in association with the colorimetric information is selected. The

  In this case, the colorimetric information of the tooth type color sample is acquired from the tooth type color sample obtained by repairing the cavity with the dental filler, so that the transmitted light at the interface between the actual inner surface of the cavity and the dental filler is obtained. This information includes the effects of scattering, reflection, or refraction. Therefore, by selecting treatment support information including information on the cavity and information on the dental filler filled in the cavity corresponding to the colorimetric information, it is possible to perform treatment in consideration of the influence on this interface. It is possible to perform highly aesthetic treatments in which treatment marks are not noticeable.

  In the above invention, the image processing apparatus includes a display unit that displays an image of the patient's tooth and an input unit, and the part setting unit is operated by the user via the input unit on the image displayed on the display unit. The part to which the designated comparison region belongs may be set as the target part.

Moreover, in the said invention, the said site | part setting means is good also as specifying the position of a cavity and setting as an object site | part in the image of the said patient's tooth.
By doing in this way, an object part is set up automatically and it becomes possible to reduce a burden of users, such as a doctor.

In the above invention, the cavity information may include cavity position information and depth information.
Moreover, in the said invention, the information of the said dental filler is good also as including at least 1 of the number of lamination | stacking, the thickness dimension of each layer, a lamination | stacking procedure, or material.
By doing in this way, based on the selected treatment support information, it is possible to perform treatment with a finish close to a tooth type color sample.

Moreover, in the said invention, the said treatment assistance information is good also as including clinical advice information, such as the viscosity of the material which comprises a dental filler, hardening time, or a handling precaution.
By doing in this way, in actual clinical practice, it is possible to cause the doctor to perform appropriate treatment according to the advice information included in the selected treatment support information.

In the above invention, the position information of the cavity may include class information of a cavity such as a class I to V cavity or a MOD cavity.
By doing so, it is possible to classify the cavities by their class information and select treatment support information suitable for the cavities formed in the teeth.

In the above invention, the image data acquisition unit acquires color sample image data by photographing the tooth type color sample, and the tooth information extraction unit acquires the tooth type color sample from the color sample image data. The colorimetric information may be extracted.
Moreover, in the said invention, the said image data acquisition means is good also as acquiring the said color sample image data by image | photographing in the state which mounted | wore the pseudo-gingival with the said tooth-type color sample.

Moreover, in the said invention, the said image data acquisition means is good also as acquiring the said color sample image data by image | photographing in the state which has arrange | positioned the adjacent tooth | gear at the side of the said tooth-type color sample.
By doing in this way, it becomes possible to photograph a tooth-type color sample in a state substantially equivalent to that in an actual oral cavity. Thereby, it is possible to further improve the reliability of the colorimetric information.

  In the above invention, the image data acquisition means acquires color sample image data using the patient's tooth as a tooth-type color sample by photographing the patient's tooth filled with a dental filler in the cavity, Tooth information extraction means extracts color measurement information of a tooth type color sample from the color sample image data acquired by the image data acquisition means, and the storage means extracts the tooth type color sample extracted by the tooth information extraction means. The colorimetric information and the information on the dental filling material filled in the cavity may be stored in association with the information on the site to which the cavity belongs.

  In this way, the patient's own teeth are imaged after filling the cavity with dental filler, and the colorimetric information obtained from the acquired image data corresponds to the information about the treatment actually performed. Therefore, it is possible to perform treatment with more accurate colorimetric information and treatment support information.

  According to the present invention, it is possible to select treatment support information such as information on a dental filler suitable for the color of a tooth of a patient having a cavity.

[First Embodiment]
Hereinafter, a dental colorimetric system according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 4, the dental color measurement system according to the present embodiment includes an imaging device 1, a cradle 2, a dental color measurement device 3, and a monitor 4.

As shown in FIG. 1, the imaging device 1 includes a light source 10, an imaging unit 20, an imaging control unit 30, a display unit 40, and an operation unit 50 as main components.
The light source 10 is disposed in the vicinity of the tip of the photographing apparatus 1 and emits illumination light having four or more different wavelength bands for illuminating the subject.

  For example, the light source 10 includes seven light sources 10a to 10g that emit light in different wavelength bands. Each of the light sources 10a to 10g includes four LEDs. As shown in FIG. 2, the center wavelengths of the light sources 10a to 10g are about 450 nm for the light source 10a (λ1), about 465 nm for the light source 10b (λ2), about 505 nm for the light source 10c (λ3), and about 505 nm for the light source 10d (λ4). The light source 10e (λ5) is about 575 nm, the light source 10f (λ6) is about 605 nm, and the light source 10g (λ7) is about 630 nm. The emission spectrum information of the LED is stored in the LED memory 11 and used in the dental color measuring device 3 described later.

  For example, the LEDs of the light sources 10a to 10g are divided into a plurality of groups. Each group is disposed at a position facing the imaging unit 20. The arrangement is not particularly limited, and for example, four LEDs may be arranged in the order of shorter wavelengths, or may be arranged in reverse order or at random. In addition to the arrangement in which the LEDs are divided into a plurality of groups, all the LEDs may be arranged so as to form one ring surrounding the imaging unit 20. In addition, as long as the LED arrangement does not hinder imaging by the imaging unit 20 described later, an appropriate arrangement such as a linear arrangement, a ring arrangement, a cross arrangement, a rectangular arrangement, or a random arrangement is adopted. It is possible. The light emitting element of the light source 10 is not limited to an LED, and for example, a semiconductor laser such as an LD (laser diode) or other light emitting elements can be used.

  In the imaging apparatus 1, an illumination optical system for irradiating illumination light from the light source 10 onto the subject surface substantially uniformly is provided on the subject side of the light source 10. A temperature sensor 13 for detecting the temperature of the LED is provided in the vicinity of the light source 10.

  The imaging unit 20 includes an imaging lens 21, an RGB imaging device 22, a signal processing unit 23, and an A / D converter 24. The imaging lens 21 forms a subject image irradiated with illumination light from the light source 10. The RGB imaging device 22 captures the subject image formed by the imaging lens 21 and outputs an image signal. The RGB imaging element 22 is constituted by, for example, a CCD, and the sensor sensitivity is such that it substantially covers the visible light range. This CCD may be a monochrome type or a color type. The RGB image sensor 22 is not limited to the CCD, and a CMOS type or other various image sensors can be widely used.

  The signal processing unit 23 performs gain correction, offset correction, and the like on the analog signal output from the RGB imaging element 22. The A / D converter 24 converts the analog signal output from the signal processing unit 23 into a digital signal. A focus lever 25 for adjusting the focus is connected to the imaging lens 21. The focus lever 25 is for adjusting the focus manually. Further, a position detection unit 26 for detecting the position of the focus lever 25 is provided.

  The imaging control unit 30 includes a CPU 31, an LED driver 32, a data I / F 33, a communication I / F controller 34, an image memory 35, and an operation unit I / F 36. Each of these units is connected to the local bus 37 and is configured to be able to exchange data via the local bus 37.

The CPU 31 controls the imaging unit 20, records the subject spectral image acquired and processed by the imaging unit 20 in the image memory 35 via the local bus 37, and outputs it to the LCD controller 41 described later.
The LED driver 32 controls light emission of various LEDs included in the light source 10.
The data I / F 33 is an interface for receiving the contents of the LED memory 11 provided in the light source 10 and the information of the temperature sensor 13.

The communication I / F controller 34 is connected to a communication I / F contact 61 serving as a connection point with the outside, and has a function for realizing communication compliant with USB 2.0, for example.
The image memory 35 temporarily records image data captured by the imaging unit 20. In the present embodiment, the image memory 35 has a memory capacity capable of recording at least seven spectral images and one RGB color image.
The operation unit I / F 36 is connected to various operation buttons provided in the operation unit 50 to be described later, and functions as an interface for transferring an input instruction input via the operation unit 50 to the CPU 31 via the local bus 37.

The display unit 40 includes an LCD controller 41 and an LCD (liquid crystal display) 42.
The LCD controller 41 causes the LCD 42 to display an image based on the image signal transferred from the CPU 31, for example, an image currently captured by the imaging unit 20 or an image that has been captured.

  At this time, if necessary, the image pattern stored in the overlay memory 43 may be superimposed on the image acquired from the CPU 31 and displayed on the LCD 42. Here, the image pattern recorded in the overlay memory 43 is, for example, a horizontal line that captures the entire tooth horizontally, a cross line that intersects this, an imaging mode, an identification number of the tooth to be imaged, or the like. .

  The operation unit 50 includes various operation switches and operation buttons for a user to input an instruction to start a spectral image shooting operation and to input an instruction to start and end a moving image shooting operation. Specifically, a shooting mode changeover switch 51, a shutter button 52, a viewer control button 53, and the like are provided. The shooting mode switch 51 is a switch for switching between normal RGB shooting and multiband shooting. The viewer control button 53 is a switch for performing operations such as changing the image displayed on the LCD 42.

  Moreover, the imaging device 1 is equipped with a lithium battery 60 as a storage battery. The lithium battery 60 is used to supply power to each unit included in the imaging device 1 and is connected to a charging contact 62 that is a contact for charging. In addition, the imaging apparatus 1 is provided with a battery LED 63 for notifying the charging state of the lithium battery 60, a power LED 64 for notifying the state of the camera, and an alarm buzzer 65 for notifying danger during photographing.

The battery LED 63 includes, for example, three LEDs of red, yellow, and green, notifies that the charging capacity of the lithium battery 60 is sufficient by lighting in green, and in other words, indicates that the battery capacity is low by lighting in yellow. The fact that charging is necessary is notified, and the fact that the battery capacity is extremely low by lighting in red, in other words, the fact that urgent charging is required is notified.
The power LED 64 includes, for example, two LEDs of red and green, and notifies that the preparation for shooting is completed by lighting in green, and that the preparation for shooting (initial warming, etc.) is in progress by blinking green. Then, it is notified that the battery is being charged by lighting in red.
The alarm buzzer 65 notifies that the captured image data is invalid by warning.

  The cradle 2 that supports the imaging device 1 described above includes a color chart 100 for calibrating the imaging unit 20, a micro switch 101 for confirming whether the imaging device 1 is mounted at a normal position, The power supply 102 for turning on / off the power, the power lamp 103 which is turned on / off in conjunction with the on / off of the power switch 102, and the light on / off in conjunction with the microswitch 101, the imaging apparatus 1 A mounting lamp 104 for notifying whether or not the camera is mounted at the normal position is provided.

  For example, when the imaging apparatus 1 is mounted at a normal position, the mounting lamp 104 is lit green, and when it is not mounted, the mounting lamp 104 is lit red. In addition, the cradle 2 is provided with a power connection connector 105 to which an AC adapter 106 is connected. Then, when the charging capacity of the lithium battery 60 included in the imaging device 1 is reduced and the yellow or red of the battery LED 63 is lit, charging of the lithium battery 60 starts when the imaging device 1 is mounted on the cradle 2. It is configured to be.

  In the imaging device 1 of the dental colorimetry system configured in this way, illumination light of four or more wavelength bands (illumination light of four or more primary colors) is sequentially irradiated onto the subject, and the number of wavelength bands of the illumination light is determined. In addition to multiband imaging for capturing the same number of subject spectral images as still images, it is also possible to capture RGB images. As one of the methods for capturing RGB images, as in a normal digital camera, there is no illumination light of the seven primary colors, and an RGB color CCD having an object illuminated by natural light or room light is used. Imaging is performed. In addition, one or more illumination lights from the seven primary colors can be selected as RGB three-color illumination lights, and these can be sequentially irradiated to capture a frame-sequential still image. Yes.

Among these imaging modes, RGB imaging is used when imaging a wide area, such as when imaging the entire patient's face or when imaging the entire jaw. On the other hand, multiband imaging is used when measuring the color of one or two teeth of a patient accurately, that is, when measuring the color of teeth.
The tooth color measurement processing by multiband imaging, which is a characteristic part of the present invention, will be described below.

[Multiband shooting]
First, the imaging device 1 is picked up from the cradle 2 by a doctor, and a contact cap is attached to an attachment port (not shown) provided on the projection port side of the housing of the imaging device 1. The contact cap is formed in a substantially cylindrical shape from a flexible material.

  Subsequently, when the photographing mode is set to the “colorimetry mode” by the doctor, the subject image is displayed on the LCD 42 as a moving image. While confirming the image displayed on the LCD 42, the doctor positions the patient's tooth to be measured at an appropriate position in the imaging range, and performs focus adjustment using the focus lever 25. At this time, since the contact cap is formed in a shape that guides the tooth to be measured to an appropriate photographing position, positioning can be easily performed.

  When the doctor presses the shutter button 52 in a state where the positioning and focus adjustment have been performed, a signal to that effect is transferred to the CPU 31 via the operation unit I / F 36, and multiband imaging is executed under the control of the CPU 31. Is done.

  In multi-band imaging, the LED driver 32 sequentially drives the light sources 10a to 10g, so that LED irradiation light having different wavelength bands is sequentially irradiated onto the subject. The reflected light of the subject is imaged on the surface of the RGB imaging element 22 of the imaging unit 20 and is captured as an RGB image. The captured RGB image is transferred to the signal processing unit 23.

  The signal processing unit 23 performs predetermined image processing on the input RGB image signal and selects predetermined one color image data corresponding to the wavelength bands of the light sources 10a to 10g from the RGB image signal. Specifically, the signal processing unit 23 selects B image data from the image signals corresponding to the light sources 10a and 10b, selects G image data from the image signals corresponding to the light sources 10c to 10e, and selects the light sources 10f, 10f, R image data is selected from the image signal corresponding to 10g. Thus, the signal processing unit 23 selects image data having a wavelength that approximately matches the center wavelength of the irradiation light.

The image data selected by the signal processing unit 23 is transferred to the A / D converter 24 and recorded in the image memory 35 via the CPU 31. As a result, an image of a color selected from the RGB image corresponding to the center wavelength of the LED is recorded in the image memory 35 as multiband image data. That is, the multiband image data is data obtained by capturing an image of a color corresponding to the center wavelength of each primary color included in the illumination light from the light source 10 for each of a plurality of primary colors. When photographing, the CPU 31 controls the irradiation time of the LED, the irradiation intensity, the electronic shutter speed of the image sensor, etc. so that the photographing of each wavelength is properly exposed, and the temperature change during the photographing is severe. In this case, the alarm buzzer 65 sounds and issues a warning.
Note that an image of a tooth may be further taken without irradiating illumination light from the LED, and recorded in the image memory 35 as external light image data.

Subsequently, when the imaging is finished and the imaging device 1 is placed on the cradle 2 by the doctor, the calibration image data is measured.
The calibration image data is measured by photographing the color chart 100 by the same procedure as the above-described multiband photographing. As a result, the multiband image data of the color chart 100 is recorded in the image memory 35 as color chart image data.
Subsequently, the color chart 100 is shot in a state where the LED is not lit at all (under dark), and this image data is recorded in the image memory 35 as dark current image data. Note that this dark current image data may be obtained by performing image capturing a plurality of times and averaging the image data.

  Subsequently, signal correction using the external light image data and dark current image data recorded in the image memory 35 is performed on each of the multiband image data and the color chart image data. The signal correction for the multiband image data is performed, for example, by subtracting the signal value of the external light image data for each pixel from the image data of the multiband image data, thereby removing the influence of external light during shooting. be able to. Similarly, signal correction for color chart image data is performed, for example, by subtracting the signal value of dark current image data for each pixel from the image data of color chart image data, and the darkness of the CCD, which changes with temperature. Current noise removal can be performed.

FIG. 3 shows an example of the signal correction result for the color chart image data. In FIG. 3, the vertical axis indicates the sensor signal value, the horizontal axis indicates the input light intensity, the solid line indicates the original signal before correction, and the broken line indicates the signal after signal correction.
The multiband image data and color chart image data after the signal correction is performed in this manner is used for the dental colorimetric device 3 via the local bus 37, the communication I / F controller 34, and the communication / I / F contact 61. And recorded in the multiband image memory 110 in the dental colorimetric device 3 shown in FIG.

  Note that the multiband image data and dark current image data of the color chart 100 are not recorded in the image memory 35 in the image pickup apparatus 1, but the local bus 37, the communication I / F controller 34, and the communication / I / F contact point. A configuration may be adopted in which the data is directly transmitted to the dental colorimetric device 3 via 61 and recorded in the multiband image memory 110 in the dental colorimetric device 3. In this case, the signal correction described above is performed in the dental color measuring device 3.

[Dental color measuring device]
As shown in FIG. 4, the dental colorimetric device 3 according to the present embodiment is composed of, for example, a personal computer or the like, and multiband image data output via the communication I / F contact 61 of the imaging device 1. And color chart image data is received, and various processing is applied to the multiband image data to create image data with advanced color reproduction of the subject tooth and suitable for the cavity of the patient's tooth Treatment support information such as a dental filler is selected, and the selected treatment support information is displayed on the monitor 4. The dental colorimetric device 3 is connected to the input device 5 and selects treatment support information suitable for the patient's teeth based on information input by the user via the input device 5.

  The dental colorimetric device 3 includes an RGB image memory 111 that records RGB color image data input from the imaging device 1, a multiband image memory (image data acquisition means) 110 that stores multiband image data, and multiband image data. The chromaticity calculation unit 70 for calculating the chromaticity of the color sample information, the color sample information storage unit (storage means) 114 in which the color sample information is stored, and the color sample information stored in the color sample information storage unit 114 A color sample selection unit 80 that selects treatment support information suitable for the color of the tooth, an image display control unit 115 that controls the display content of the monitor 4, and a color that generates color image data based on signals from the chromaticity calculation unit 70 An image creation processing unit 112, a color reproduction characteristic storage unit 116 in which various parameters of the imaging device 1 are stored, an RGB image memory 111, and a color An image filing unit 113 for storing the RGB color image data and color image data sent from the image generation processing unit 112 to the image display control unit 115 comprises a main structure.

The multiband image memory 110 is for holding multiband image data and color chart image data acquired by the imaging apparatus 1. The RGB image memory 111 is for holding RGB color image data acquired by the imaging apparatus 1.
The chromaticity calculation unit 70 includes a spectrum estimation calculation unit 71, an observation spectrum calculation unit 72, and a chromaticity value calculation unit 73.

  The spectrum estimation calculation unit 71 uses the multiband image data and the color chart image data held in the multiband image memory 110 to estimate the spectrum of the multiband image data (in this embodiment, the spectrum of spectral reflectance). Etc.

  The observation spectrum calculation unit 72 multiplies the tooth spectrum calculated by the spectrum estimation calculation unit 71 by the spectrum S (λ) of the illumination light used for observation, so that the subject under the illumination light used for observation is obtained. Ask for the spectrum. The spectrum S (λ) of the illumination light is a spectrum of illumination light from a light source used for observing the color of the tooth, such as a D65 or D55 light source, a fluorescent light source, and the data is a color reproduction characteristic storage unit. 116 is stored in advance.

  The chromaticity value calculation unit 73 calculates chromaticity values L *, a *, and b * from the spectrum G (x, y, λ) of the subject under illumination light used for observation. Specifically, the chromaticity value calculation unit 73 averages the chromaticity values L *, a *, and b * for each tooth part, and associates the result with information on the part to which the cavity belongs to the image display control unit. 115 and the color sample selection unit 80. In the present embodiment, as shown in FIG. 5, there are three parts to which the cavity belongs, that is, a tooth neck (cervical), a center (body), and an incisal edge (incisal).

  On the other hand, the spectrum G (x, y, λ) of the subject under illumination light used for observation is sent to the color image creation processing unit 112 and the image filing unit 113. The color image creation processing unit 112 creates color image data RGB2 (x, y) to be displayed on the monitor 4 and outputs it to the image display control unit 115. Note that the color image creation processing unit 112 may perform image processing such as contour enhancement.

Next, the color sample information storage unit 114 will be described.
In the color sample information storage unit 114, a cavity is formed in a tooth shape color sample having a tooth shape and a layer structure corresponding to the part, and the tooth shape color sample in a state in which the cavity is repaired with a dental filler. The acquired average chromaticity value and treatment support information including information on the cavity and information on the dental filler are stored for each tooth type color sample in association with the information on the site to which the cavity belongs.

The information stored in the color sample information storage unit 114 is acquired as follows.
First, a large number of tooth type color samples having an actual tooth shape and a layer structure corresponding to each part are prepared. This color sample simulates the structure of a human tooth. For example, the tooth neck has a two-layer structure, the center has a three-layer structure, and the incision has a four-layer structure. The combinations of thickness and color are different from each other. In addition, you may utilize a patient's actual tooth as a tooth type color sample.

  Subsequently, multi-band image data is acquired by photographing these tooth-shaped color samples with the above-described imaging device 1 before forming the cavity. The acquired multiband image data is recorded in the multiband image memory 110 in the dental colorimetric device 3 together with the color chart image data, and then transferred to the chromaticity calculation unit 70.

  Moreover, multiband image data is acquired by image | photographing with the imaging device 1 in the state which formed the cavity in this tooth type color sample. The acquired multiband image data is recorded in the multiband image memory 110 in the dental colorimetric device 3 together with the color chart image data, and then transferred to the chromaticity calculation unit 70.

  Furthermore, multiband image data is acquired by imaging | photography with the imaging device 1 in the state after repairing the cavity formed in this tooth type color sample with the dental filler. The acquired multiband image data is recorded in the multiband image memory 110 in the dental colorimetric device 3 together with the color chart image data, and then transferred to the chromaticity calculation unit 70.

  In the chromaticity calculation unit 70, each process is performed using the multiband image data and color chart image data of the tooth color sample, and the RGB color image data under a predetermined illumination is created by the color image creation processing unit 112. , Average chromaticity values (L * 1_α to L * n_α, a * 1_α to a * n_α, b * 1_α to b * n_α, L * 1_β to L * n_β, a * 1_β to a * n_β, b * 1_β to b * n_β, L * 1_γ to L * n_γ, a * 1_γ to a * n_γ, b * 1_γ to b * n_γ) are calculated by the chromaticity value calculation unit 73. The RGB color image data of the tooth type color sample and the average chromaticity value (colorimetric information) of each part are transferred to the color sample selection unit 80.

On the other hand, simultaneously with the photographing of the tooth type color sample after forming the cavity and filling the cavity, the type of the tooth type color sample and the treatment support information are input from the input device 5. The treatment support information refers to various kinds of information necessary for a doctor to fill a cavity formed in a patient's tooth with a dental filler. For example, the depth, position (contour data), and class of the cavity information (FIG. 16, see FIG. 17.) and the cavity of information, such as, as shown in FIG. 7, the number of layers _X 1 to X ₄ of the dental filling material, the presence or absence of each _X 1 to X _4, each layer and an information of the dental filler material and thickness, etc. of the X ₁ to X _4. 7, the surface layer (clear layer) X ₄ dental filling material is filled into the bevel portion 117 extending toward the opening direction of the cavity.

The color sample selection unit 80 includes the average chromaticity value transferred from the chromaticity calculation unit 70, the RGB color image data input from the color image creation processing unit 112, and the tooth-type color sample input from the input device 5. A set of color sample information relating to the tooth type color sample is created by associating the type and treatment support information with the information of the site to which the cavity belongs, and this is stored in the color sample information storage unit 114.
FIG. 6 is a diagram illustrating an example of n sets of color sample information stored in the color sample information storage unit 114.

  Next, the color sample selection unit 80 will be described with reference to FIG. FIG. 8 is a functional block diagram of the color sample selection unit 80. As shown in FIG. 8, the color sample selection unit 80 corresponds to a part setting unit (part setting means) 81 that sets a target part for comparing a patient's tooth and a color sample, and position information corresponding to the target part. A comparison information extraction unit (comparison information extraction means) 82 that extracts the average chromaticity value of the attached cavity from the color sample information storage unit 114, and a region setting unit 81 from among the average chromaticity values of each region of the patient's tooth A tooth information extracting unit (tooth information extracting unit) 83 for extracting an average chromaticity value associated with the position information of the cavity corresponding to the target region set by the step, and a plurality of averages extracted by the comparison information extracting unit 82 A color comparison unit (color comparison unit) 84 that compares the chromaticity value with the average chromaticity value of the patient's tooth extracted by the tooth information extraction unit 83, and a comparison information extraction unit based on the comparison result by the color comparison unit 84 A plurality of planes extracted by 82 Selecting at least one of the average chromaticity value from the chromaticity values, and an information selection section (information selecting means) 85 for selecting the treatment support information corresponding to the average chromaticity value.

The treatment support information selected by the information selection unit 85 is output to the image display control unit 115 together with the RGB color image of the color sample.
The image display control unit 115 displays information input from each unit on the monitor 4.

Next, the process executed by the dental color measuring device 3 according to this embodiment will be described in detail.
First, the patient's teeth in which the cavity is formed are imaged by the imaging device 1, and the multiband image data is transferred to the dental colorimetric device 3 together with the color chart image data and recorded in the multiband image memory 110. The multiband image data and the color chart image data captured in the multiband image memory 110 are transferred to the chromaticity calculation unit 70.

In the chromaticity calculation unit 70, first, contour information of a cavity formed in a patient's tooth is extracted, and a part to which the cavity belongs is set as a target part. Since the color of the cavity is different from the surrounding colors, the cavity can be easily identified by performing image processing such as edge detection. In the chromaticity calculation unit 70, a spectrum (spectrum reflectance spectrum in the present embodiment) estimation processing and the like are performed by the spectrum estimation calculation unit 71 on the tooth region avoiding the identified cavity portion.
As shown in FIG. 9, the spectrum estimation calculation unit 71 includes a conversion table creation unit 711, a conversion table 712, an input γ correction unit 713, a pixel interpolation calculation unit 714, an in-plane unevenness correction unit 715, a matrix calculation unit 716, and a spectrum. An estimation matrix creation unit 717 is provided.

  The input γ correction unit 713 and the pixel interpolation calculation unit 714 are individually provided for each of the multiband image data and the color chart image data. Specifically, an input γ correction unit 713a and a pixel interpolation calculation unit 714a are provided for multiband image data, and an input γ correction unit 713b and a pixel interpolation calculation unit 714b are provided for color chart image data. .

  In the spectrum estimation calculation unit 71 having such a configuration, the multiband image data and the color chart image data are respectively transferred to the separately provided input γ correction units 713a and 713b, and after the input γ correction is performed. The pixel interpolation calculation units 714a and 714b perform image interpolation calculation processing. The signals after these processes are transferred to the in-plane unevenness correction unit 715, where the in-plane unevenness correction processing of the multiband image data using the color chart image data is performed. Thereafter, the multiband image data is transferred to the matrix calculation unit 716, and the spectral reflectance is calculated using the spectrum estimation matrix Mspe created by the spectrum estimation matrix creation unit 717.

Hereinafter, each image processing performed in each unit will be specifically described.
First, as the previous stage of input γ correction, the contents of the conversion table 712 are created by the conversion table creation unit 711. Specifically, the conversion table creation unit 711 has data in which the input light intensity is associated with the sensor signal value, and creates the contents of the conversion table 712 based on these data. This conversion table 712 is created from the relationship between the input light intensity and the output signal value. For example, as shown by the solid line in FIG. 10A, the input light intensity and the sensor signal value are approximately proportional to each other. Created to be

  Each of the input γ correction units 713a and 713b performs input γ correction on the multiband image data and the color chart image data by referring to the conversion table 712. This conversion table is created so that an input light intensity D corresponding to the sensor value A at the present time is obtained, and an output sensor value B corresponding to the input light intensity D is output. As a result, the conversion table shown in FIG. It becomes like this. In this way, when the input γ correction is performed on the multiband image data and the color chart image data, the corrected image data is transferred to the pixel interpolation calculation units 714a and 714b, respectively.

  In the pixel interpolation calculation units 714a and 714b, pixel interpolation is performed by applying a low-pass filter to each of the multiband image data and color chart image data after the input γ correction. FIG. 11 shows an example of a low-pass filter applied to the R signal and the B signal. FIG. 12 shows a low-pass filter applied to the G signal. By multiplying each multiband image data by such a low-pass filter for pixel interpolation, for example, an image of 144 pixels × 144 pixels is changed to an image of 288 pixels × 288 pixels.

The multiband image data g _k (x, y) subjected to the image interpolation calculation is transferred to the in-plane unevenness correction unit 715. The in-plane unevenness correction unit 715 corrects the luminance at the center of the screen of the multiband image data using the following equation (1).

In the above equation (1), ck (ξ, η) is color chart image data, g _k (x, y) is multiband image data after input γ correction, (x0, y0) is the center pixel position, δ ( = 5) is the area average size, and g ′ _k (x, y) is the multiband image data after the in-plane unevenness correction (where k = 1,..., N (number of bands)). The in-plane unevenness correction is performed on each image data of the multiband image data.

The multiband image data g ′ _k (x, y) after the in-plane unevenness correction is transferred to the matrix calculation unit 716. The matrix calculation unit 716 performs spectrum (spectral reflectance) estimation processing using the multiband image data g ′ _k (x, y) from the in-plane unevenness correction unit 715. In this spectrum (spectral reflectance) estimation process, spectral reflectance is estimated at 1 nm intervals in a wavelength band from 380 nm to 780 nm. That is, in this embodiment, a 401-dimensional spectral reflectance is estimated.

In general, a heavy and expensive spectroscopic measuring instrument is used to obtain the spectral reflectance for each wavelength. However, in this embodiment, since the subject is limited to teeth, the subject has a certain amount. By utilizing the feature, the 401-dimensional spectral reflectance is estimated with a small number of bands.
Specifically, a 401-dimensional spectrum signal is calculated by performing a matrix operation using the multiband image data g ′ _k (x, y) and the spectrum estimation matrix Mspe.

The spectrum estimation matrix Mspe is created by the spectrum estimation matrix creation unit 717 based on the spectral sensitivity data of the camera, the LED spectrum data, and the statistical data of the subject (tooth). The creation of the spectrum estimation matrix is not particularly limited, and a well-known method can be used. For example, SKPark and FOHuck "Estimation of spectral reflectance
curves from multispectrum image data ", Applied Optics,
16, pp 3107-3114 (1977).

  Note that the spectral sensitivity data of the camera, the LED spectrum data, the subject (tooth) statistical data, and the like are stored in advance in the image filing unit 113 shown in FIG. When the spectral sensitivity of the camera changes depending on the position of the sensor, spectral sensitivity data may be acquired according to the position, or the center position may be appropriately corrected and used. .

When the spectral reflectance is calculated by the spectrum estimation calculation unit 71, the calculation result is transferred to the observation spectrum calculation unit 72 shown in FIG. 4 together with the multiband image data.
In the observation spectrum calculation unit 72, the tooth spectrum calculated by the spectrum estimation calculation unit 71 is multiplied by the spectrum S (λ) of illumination light stored in advance in the color reproduction characteristic storage unit 116, whereby observation is performed. A spectrum G (x, y, λ) of the subject under the illumination light to be used is obtained. The spectrum G (x, y, λ) of the subject under the illumination light used for the observation obtained in the observation spectrum calculation unit 72 is transferred to the chromaticity value calculation unit 73.

  In the chromaticity value calculation unit 73, L *, a *, and b * that are chromaticity values are calculated from the spectrum G (x, y, λ) of the subject under illumination light used for observation, and further, the tooth The chromaticity values L *, a *, and b * are averaged for each region, and the result is output to the color sample selection unit 80 and the image display control unit 115 in association with information on the region to which the cavity belongs.

  Also, the spectrum G (x, y, λ) of the subject under illumination light used for observation is sent from the observation spectrum calculation unit 72 to the color image creation processing unit 112. In the color image creation processing unit 112, color image data RGB2 (x, y) for display on the monitor 4 is created and output to the image filing unit 113 and the image display control unit 115.

  When the RGB color image data RGB2 (x, y) and the average chromaticity values L *, a *, b * of each part of the patient's tooth are input, the image display control unit 115 monitors these information 4 To display. FIG. 13 is a diagram showing an example of the display screen, and an RGB color image of the patient's teeth is displayed at the upper left of the approximate center of the screen.

  The user operates the input device 5 to set a comparison area for comparison with the tooth color sample on the RGB color image of the patient's teeth displayed on the monitor 4. Thereby, as shown in FIG. 14, the comparison area P is set on the RGB color image of the patient's teeth displayed on the monitor 4, and the position information of the comparison area P is input from the input device 5 to the color sample selection unit. 80.

  In FIG. 8, a part setting unit 81 of the color sample selection unit 80 determines a part to which the comparison area P belongs based on the information on the comparison area P given from the input device 5 and sets the part as a target part. For example, the color sample selection unit 80 determines a part to which the comparison area P belongs by recognizing which part of the tooth the comparison area P corresponds to by contour extraction. Here, for example, a case where the central portion is set as the target part will be described.

  The information on the target part set by the part setting unit 81 is transferred to the comparison information extraction unit 82 and the tooth information extraction unit 83. The comparison information extraction unit 82 extracts information stored in association with the central portion (target part) from the color sample information storage unit 114 and outputs the extracted information to the color comparison unit 84. Further, the tooth information extraction unit 83 extracts an average chromaticity value corresponding to the central portion from the average chromaticity values of each part of the patient's tooth transferred from the chromaticity value calculation unit 73, and the color comparison unit 84. Output to.

  The color comparison unit 84 receives the average chromaticity values L *, a *, b * input from the comparison information extraction unit 82 and the average chromaticity values L *, a *, b * input from the tooth information extraction unit 83. And the calculated color difference ΔE and the treatment support information are associated with each other and output to the information selection unit 85. The color difference ΔE is given by the following equation (2).

  In (2) above, L *, a *, b * are the average chromaticity values at the center of the patient's teeth, and L ′ *, a ′ *, b ′ * are the average chromaticity values of the tooth-type color sample. .

  The information selection unit 85 selects the average chromaticity value that minimizes the color difference ΔE as the optimal average chromaticity value, and displays the treatment support information stored in correspondence with the selected average chromaticity value as an image. The RGB color image data of the color sample information that is output to the control unit 115 and stored corresponding to the average chromaticity value is acquired from the color sample information storage unit 114, and the acquired RGB color image of the tooth-type color sample is acquired. Data is output to the image display control unit 115.

  The image display control unit 115 includes RGB color image data of the tooth type color sample input from the color sample selection unit 80, selected average chromaticity values L *, a *, b *, color difference ΔE, treatment support information, and the like. Various information is displayed on the monitor 4. FIG. 15 shows an example of the monitor screen. As shown in FIG. 15, the RGB color image data of the tooth type color sample selected by the information selection unit 85 is displayed side by side with the RGB color image of the patient's tooth, and treatment support of the target site, that is, the central portion is displayed. Information is displayed.

  In FIG. 15, the left image is an image of the patient's teeth (tooth before formation of the cavity and adjacent teeth on both sides thereof). The right image is an image of a dental color sample. A rectangle P on the image of the patient's tooth is a comparison area P of the patient's tooth, and the display / non-display thereof can be switched. A broken-line rectangle Q on the dental color sample image is a comparison region of the dental color sample, and a broken-line ellipse R is position information on the cavity boundary as treatment support information, and display / non-display can be switched. The table at the bottom of FIG. 15 shows the average chromaticity value (Target) of the patient's teeth, the average chromaticity value (Reference) of the dental color sample, and the difference (Δ). Display / non-display of the lead line S from the image of the dental color sample and the surrounding line T in the table can be switched.

In FIG. 15, the treatment support information is shown as a list. However, the layer structure in the tooth-type color sample may be shown in an easy-to-understand manner, or the cross-sectional view of the center part is displayed to make the structure of each layer easy to understand. It may be shown. Note that the display example is just an example, and any information may be used as long as it notifies the user of treatment support information.
Further, in the rectangular frame W in FIG. 15, in addition to the treatment support information such as the number of layers, the thickness dimension of each layer, the layering procedure or the material, the viscosity of the material constituting the dental filler, the curing time, or the handling Clinical advice information such as precautions may be displayed as treatment support information.

  Furthermore, as shown in FIG. 18, the RGB color image of the patient's tooth and the RGB color image of the tooth-type color sample may be displayed adjacent to each other. When the broken line U in the center of the image displays the target site P of cavity formation in the tooth of the patient on the left side of the broken line U and the target site Q of cavity formation in the dental color sample on the right side of the broken line U adjacent to each other. The display / non-display can be switched. By displaying in this way, it becomes easy to make a subtle difference in color tone stand out and compare.

  As described above, according to the dental color measurement device according to the present embodiment, the average chromaticity value of the tooth pattern color sample is acquired from the tooth pattern color sample obtained by repairing the cavity with the dental filler. Therefore, the information includes the influence of scattering, reflection or refraction of transmitted light at the interface between the inner surface of the actual cavity and the dental filler. Therefore, by selecting treatment support information including information on the cavity and information on the dental filling material filled in the cavity corresponding to the average chromaticity value, it is possible to perform treatment in consideration of the influence on the interface. Information can be provided, and a highly aesthetic treatment in which treatment marks are not conspicuous can be performed.

  In addition, the dental cavity is actually filled with the dental filling material, and the color measurement information is obtained in association with the treatment support information from the tooth shape color sample after filling. It is possible to select treatment support information suitable for a treatment form that forms a cavity in a tooth. In addition, since the dental cavity filler formed in the tooth type color sample is filled with the actual dental filling material, the dental filling material practiced in clinical practice is simulated, and the patient's post-treatment A tooth-shaped color sample that is closer to the teeth can be obtained. Further, a large number of tooth type color samples are created by changing the position, shape, and color distribution of the cavity, and the color sample information storage unit 114 stores colorimetric information and treatment support information of each tooth type color sample. You can also. Thereby, treatment support information suitable for various symptoms and various tooth colors of patients can be selected.

In the present embodiment, the information on the tooth-type color sample having the average chromaticity value close to the color of the patient's tooth is selected based on the average chromaticity value, but the above example is an example, It is good also as selecting based on colorimetric information. For example, instead of the average chromaticity value, the treatment support information may be selected based on a spectrum (in this embodiment, spectral reflectance) obtained by the chromaticity calculation unit 70.
In this case, the color sample information storage unit 114 stores the spectral reflectance acquired by the spectrum estimation calculation unit 71 (see FIG. 4) instead of the average chromaticity value.
The selection of the treatment support information is performed based on, for example, a spectrum determination value Jvalue based on the following equation (3) and the spectrum determination value Jvalue.

In the above equation (3), Jvalue is a spectrum judgment value, C is a normalization coefficient, n is a statistical number (the number of λ used in the calculation), λ is a wavelength, and f ₁ (λ) is a spectral sensitivity of a patient's tooth. The spectrum value, f ₂ (λ) is the spectral sensitivity spectrum value in the information of the tooth-shaped color sample, and E (λ) is the determination sensitivity correction value. In the present embodiment, weighting relating to spectral sensitivity according to λ is performed by E (λ).

In this way, the spectral reflectance of each tooth-type color sample is substituted into f ₂ (λ) in the above equation (3), and the respective spectrum determination values Jvalue are calculated. And it is good also as selecting the information of a tooth type color sample when the smallest spectrum judgment value Jvalue is shown. Further, the number of tooth type color samples to be selected is not limited to one, and it is also possible to select all the information in which a preset number or difference is within a certain range.

  Further, in the present embodiment, as shown in FIG. 5, the tooth is divided into three regions of a tooth neck portion, a central portion, and a cutting edge portion. However, the present invention is not limited to this. For example, FIG. As shown, other classifications may be made, such as class I, class II, class III, class IV, class V.

  Further, in the present embodiment, a single tooth-type color sample is taken by the imaging apparatus 1, but instead, as shown in FIG. 19, a tooth-type color sample and a pseudo-gingival made of red resin are used. A pseudo adjacent tooth may be attached and photographing may be performed in this state. By photographing the tooth-type color sample under the same conditions as in the actual oral cavity, it is possible to acquire color sample image data that takes into account the red reflection by the gingiva, the shadow of the adjacent teeth, and the like. By acquiring colorimetric information such as average chromaticity values using such color sample image data, it becomes possible to select a group of information closer to the color of the patient's teeth and to obtain more appropriate treatment support information It becomes possible.

  In this embodiment, the average chromaticity value of each part is used as the colorimetric information. However, the chromaticity value at the center position of the part may be adopted as the colorimetric information instead of the average. The color space for obtaining colorimetric information is not limited to the L * a * b * color space. For example, luminance, saturation, and hue in the VCH space may be used, and X, Y, and Z values in the XYZ space may be used. It is good also as using.

Further, the tooth type color sample may be further classified into anterior teeth, molar teeth, canines, etc., or may be classified according to the age of children, adults, elderly people, and the like. This is also because the layer structure, particularly the layer thickness, differs depending on these.
In the present embodiment, the comparison region is designated on the RGB color image of the patient's teeth displayed on the monitor 4 and the target region is set based on the comparison region. Is not limited to this example. For example, the target part itself may be directly designated from the input device 5.

  In the present embodiment, the chromaticity value of each part of the tooth-type color sample is acquired by photographing the tooth-type color sample with the imaging device 1. Is not limited to this example. For example, the spectroscope may measure the chromaticity value of the tooth color sample for each part, and the average chromaticity value in each part may be transferred to the color sample selection unit 80.

  Further, in the present embodiment, a cavity is formed in each part of the tooth-type color sample having an actual tooth shape, and the dental filler is filled with a layer structure corresponding to the part with respect to the cavity, The color measurement information is obtained from the tooth type color sample, but the color measurement information is acquired from the color sample image data obtained by photographing the tooth type color sample after filling the dental filler. Alternatively, when the colorimetric information of the tooth type color sample is known, it may be directly input from the input device 5 by the user.

  In the case of obtaining the color measurement information of the tooth type color sample by photographing the tooth type color sample after filling the dental filler, the color inside and outside the cavity is obtained by the user or the dental color measurement device 3 in the vicinity of the boundary of the cavity. Are compared. If the color inside and outside the cavity is almost the same, the color sample information includes the color measurement information of the tooth color sample after filling the dental filler and the treatment support information such as the layer structure of the filled dental filler. Stored in the storage unit 114. If the colors inside and outside the cavity do not match, the user refills the cavity with the dental filler, and the colors inside and outside the cavity are compared again. These operations are repeated until the color inside and outside the cavity matches.

  Further, in this embodiment, as shown in FIG. 6, n sets of color sample information stored in the color sample information storage unit 114 are displayed by sorting according to class information as shown in FIG. You may decide to do it.

1 is a block diagram illustrating a schematic configuration of an imaging device and a cradle according to a first embodiment of the present invention. It is a figure which shows the spectrum of the light source shown in FIG. It is a figure explaining signal correction. 1 is a block diagram illustrating a schematic configuration of a dental colorimetric device according to a first embodiment of the present invention. It is the figure which showed each site | part set to a tooth. It is the figure which showed an example of color sample information. It is a longitudinal cross-sectional view which shows the layer structure of the dental filler with which the cavity formed in the color sample is filled. It is a functional block diagram of the color sample selection part which concerns on the 1st Embodiment of this invention. It is a figure which shows the schematic internal structure of the spectrum estimation calculating part shown in FIG. It is a figure explaining input gamma correction. It is a figure which shows an example of the low pass filter applied to R signal and B signal in pixel interpolation calculation. It is a figure which shows an example of the low pass filter applied to G signal in pixel interpolation calculation. It is the figure which showed an example of the display screen of a monitor. FIG. 13 is a diagram showing a display screen when a comparison area is designated on the display screen shown in FIG. 12. It is a figure which shows the screen on which the treatment assistance information selected by the color sample selection part was displayed. It is a figure which shows the class information for setting the site | part to which a cavity exists. It is a figure which shows the class information for setting the site | part to which the cavity formed in a back tooth belongs. It is a figure which shows the other display mode of treatment assistance information. It is the figure which showed an example of arrangement | positioning of the tooth type color sample at the time of imaging | photography. It is a figure which shows the example of a display which sorted the color sample information of FIG. 6 by class information.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Cradle 3 Dental colorimetric device 4 Monitor 5 Input device 70 Chromaticity calculation part 71 Spectrum estimation calculation part 72 Observation spectrum calculation part 73 Chromaticity value calculation part 80 Color sample selection part 81 Site setting part (part setting means) )
82 Comparison information extraction unit (comparison information extraction means)
83 Tooth information extraction unit (tooth information extraction means)
84 Color comparison part (color comparison means)
85 Information selection unit (information selection means)
110 Multiband image memory (image data acquisition means)
111 RGB image memory (image data acquisition means)
112 Color image creation processing unit 114 Color sample information storage unit (storage unit)
115 Image display controller

Claims (11)

Corresponding colorimetric information acquired from a dental color sample whose cavity has been repaired with a dental filler and treatment support information including information on the cavity and information on the dental filler correspond to information on the site to which the cavity belongs Storage means for storing together,
Image data acquisition means for acquiring image data of a patient's teeth;
A site setting means for setting a target site for comparing the color of the tooth of the patient and the color of the tooth type color sample;
Comparison information extraction means for extracting the colorimetric information stored in association with the information of the part to which the cavity corresponds to the target part set by the part setting means;
Tooth information extracting means for extracting colorimetric information about the target part based on image data of the patient's tooth acquired by the image data acquiring means;
Color comparison means for comparing the color measurement information of the tooth type color sample extracted by the comparison information extraction means with the color measurement information of the patient's tooth extracted by the tooth information extraction means;
Based on the comparison result by the color comparison means, color measurement information of at least one tooth type color sample is selected, and at least one treatment support information stored in the storage means is associated with the selected color measurement information. A dental colorimetric device comprising information selecting means for selecting. Display means for displaying an image of the patient's teeth; and input means;
The dental colorimetry according to claim 1, wherein the part setting unit sets, as the target part, a part to which a comparison region designated by a user via the input unit on the image displayed on the display unit belongs. apparatus.   The dental colorimetric device according to claim 2, wherein the part setting unit specifies a position of a cavity in the patient's tooth image and sets the position as the target part.   The dental colorimetric device according to any one of claims 1 to 3, wherein the cavity information includes position information and depth information of the cavity.   The dental colorimetric device according to any one of claims 1 to 4, wherein the information on the dental filler includes at least one of the number of layers, the thickness dimension of each layer, a layering procedure, or a material.   The dental measurement according to any one of claims 1 to 5, wherein the treatment support information includes clinical advice information such as a viscosity of a material constituting the dental filler, a curing time, or handling precautions. Color device.   The dental colorimetric device according to claim 4, wherein the position information of the cavity includes class information of a cavity such as a class I to V cavity or a MOD cavity. The image data acquisition means acquires color sample image data by photographing the tooth type color sample,
The dental colorimetric device according to any one of claims 1 to 7, wherein the tooth information extraction unit extracts colorimetric information of the tooth type color sample from the color sample image data.   The dental colorimetric device according to claim 8, wherein the image data acquisition unit acquires the color sample image data by taking an image in a state in which the tooth mold color sample is attached to a pseudogingiva.   The dental colorimetric apparatus according to claim 8 or 9, wherein the image data acquisition unit acquires the color sample image data by photographing in a state where adjacent teeth are arranged on a side of the tooth type color sample. . The image data acquisition means acquires color sample image data using a tooth of a patient's tooth as a tooth-type color sample by photographing a patient's tooth filled with a dental filler in a cavity,
The tooth information extracting means extracts colorimetric information of the tooth type color sample from the color sample image data acquired by the image data acquiring unit;
The storage means stores the colorimetric information of the tooth type color sample extracted by the tooth information extraction means and the information of the dental filling material filled in the cavity corresponding to the information of the part to which the cavity belongs. The dental colorimetric device according to any one of claims 1 to 10.

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