JP2010082196A - Dental filling material selection support system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To present appropriate candidates for a filling material by correctly estimating the original color of a region even if the region has a deficiency or a discolored part such as a lesion of a tooth. <P>SOLUTION: The dental filling material selection support system 1 includes: a reference point setting part 5 for setting a plurality of reference points disposed on the outer side of the lesion of the tooth; a scan line setting part 3 for setting a scan line passing through the plurality of the set reference points and a representative point within the lesion; a color information acquisition part 2 for acquiring color information of the tooth at the plurality of reference points set by the reference point setting part 5; a color estimating part 3 for estimating the original color of the tooth at the representative point based on the acquired color information of the tooth at the respective reference points; a filling material determining part 6 for determining the filling material based on the estimated original color of the tooth at the representative point; and a filling material presenting part 4 for presenting the determined filling material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dental filler selection support system.

2. Description of the Related Art Conventionally, a dental determination device that measures and determines the colors of teeth and dental restoration materials is known (see, for example, Patent Document 1).
In this apparatus, teeth are divided into a plurality of areas, the colors of the respective areas are measured, and the average value is calculated to obtain the colors of the teeth and the dental template.

Japanese Patent No. 3875512

  However, in the apparatus of Patent Document 1, when a tooth is missing or discolored as in the case of a caries, or when it is discolored due to adhesion of a pigment even if it is not a caries, the tooth There is a disadvantage that the original color cannot be measured, and as a result, an appropriate dental filler cannot be presented.

  The present invention has been made in view of the above-described circumstances, and even if a missing or discolored part such as a lesioned part of a tooth is properly estimated by properly estimating the original color of the part. It is an object of the present invention to provide a dental filler selection support system that can present candidates.

In order to solve the above problems, the present invention employs the following parts.
The present invention relates to a reference point setting unit for setting a plurality of reference points arranged outside a lesion area of a tooth, a plurality of reference points set by the reference point setting unit, and a representative point in the lesion area A scanning line setting unit for setting a scanning line to be performed, a color information acquisition unit for acquiring tooth color information at a plurality of reference points set by the reference point setting unit, and each reference acquired by the color information acquisition unit A color estimation unit that estimates the original color of the tooth at the representative point based on the color information of the tooth at the point, and a filler is determined based on the original color of the tooth at the representative point estimated by the color estimation unit There is provided a dental filler selection support system including a filler determining unit that performs the above and a filler presenting unit that presents the filler determined by the filler determining unit.

  According to the present invention, when a plurality of reference points are set outside the tooth lesion area by the reference point setting unit, a scanning line passing through the reference point and a representative point in the lesion area is set by the scanning line setting unit. . As the representative point, the center of gravity of the lesion area or any other arbitrary point is selected. When the color information acquisition unit acquires the tooth color information at the reference point, the color estimation unit estimates the original color of the tooth at the representative point from the color information at the reference point. In other words, the original color of the tooth changes gently between successive regions and does not change suddenly. Therefore, the original color of the representative point is determined from the tendency of the color change of a plurality of reference points located outside the lesion region. Can be accurately estimated. And since the filler is determined by the filler determining unit based on the estimated original color of the representative point, the filler presenting unit displays the filler, thereby assisting the user in selecting the filler. can do.

In the above invention, the color estimation unit may estimate the original color of the tooth at the representative point by interpolating the tooth color information at the reference point.
In this way, it is possible to easily estimate the original color of the representative point tooth in the lesion area. In addition to linear interpolation, curved interpolation may be employed for the interpolation. Moreover, when the tendency of a change is known beforehand, you may weight and store. The position of the reference point is preferably set to a position sandwiching the lesion area, but a plurality of reference points may be set on one side of the lesion area.

In the above invention, a lesion area setting unit that sets the lesion area based on a tooth image may be provided.
By doing in this way, the operation of setting the lesion area by the user can be omitted, and the time can be saved without labor.

Moreover, in the said invention, the said color information acquisition part acquires the color information of the tooth in the said representative point, and the said lesion area setting part is an area | region where the color difference with the representative point in the image of a tooth is below a predetermined threshold value May be set as a lesion area.
In this way, the lesion area can be set automatically and easily.

In the above invention, the scanning line setting unit may generate a plurality of scanning line candidates that pass through the plurality of reference points set by the reference point setting unit and the lesion area; A scanning line candidate selection unit that presents the scanning line candidate generated by the scanning line candidate generation unit and selects one scanning line candidate from the plurality of presented scanning line candidates. Scanning line candidates selected by the selection unit may be set as scanning lines.
By doing in this way, a user's favorite scanning line can be easily selected from the settable scanning lines.

  The present invention also provides a scanning line setting unit that sets a scanning line that passes through at least one reference point arranged at a position adjacent to a lesion area of a tooth and a representative point in the lesion area, and the scanning line Corresponding scanning line setting unit for setting corresponding scanning lines arranged in a corresponding positional relationship with respect to the scanning line set by the setting unit, tooth color information at the reference point, tooth color information along the corresponding scanning line Change information and color information acquisition unit for acquiring tooth color information at corresponding reference points arranged in a corresponding positional relationship with respect to the reference point, the reference point acquired by the color information acquisition unit and the correspondence A color estimation unit that estimates the original color of the tooth at the representative point based on the color information of the tooth at the reference point and the tendency of change in the color information of the tooth along the corresponding scanning line, and the color estimation unit Said bill A dental filler selection support system comprising a filler determining unit that determines a filler based on the original color of a tooth at a point, and a filler presenting unit that presents the filler determined by the filler determining unit provide.

According to the present invention, a scanning line passing through at least one reference point arranged outside the lesion area and a representative point in the lesion area is set by the scanning line setting unit, and the scanning line is set by the corresponding scanning line setting unit. Corresponding scanning lines arranged in a corresponding positional relationship are set.
In general, the tendency of tooth color change is the same at a symmetrical position with respect to the center line of the same tooth, a corresponding position of an adjacent tooth, and a symmetrical position with respect to the center line of the dentition. Therefore, the color information acquisition unit acquires the color information of the tooth of at least one reference point adjacent to the lesion area, the tendency of the color information of the tooth along the corresponding scanning line, and the color information of the tooth at the corresponding reference point. Thus, it is possible to easily estimate the original color of the tooth at the representative point by applying the change tendency of the color information along the corresponding scanning line from the color information at the corresponding reference point to the color information at the reference point.

  Here, the tendency of the tooth color change can be obtained by acquiring color information at a plurality of positions spaced along the corresponding scanning line. Unlike the color information of representative points where it is difficult to directly measure the original color information due to caries and cavity, by acquiring color information on the corresponding scanning line without cavity and cavity, the original color information of the representative point can be obtained more accurately. The color can be estimated. Then, since the filler is determined by the filler determination unit from the original color of the tooth at the estimated representative point, the determination when the user selects the filler by presenting the filler by the filler presentation unit Can help.

In the above invention, the corresponding reference point and the corresponding scanning line may be respectively arranged at symmetrical positions of the reference point and the scanning line with respect to the center line of the tooth.
In the above invention, the corresponding reference point and the corresponding scanning line are respectively arranged at line symmetry positions of the reference point and the scanning line with reference to a straight line passing through a boundary line between the tooth and the adjacent tooth. Also good.
Moreover, in the said invention, the said corresponding reference point and the said corresponding scanning line may be arrange | positioned in the line symmetrical position of the said reference point and the said scanning line on the basis of the centerline of a dentition.

Furthermore, in the above invention, the color estimation unit includes the tooth color information at the reference point, the line symmetry position with respect to the center line of the tooth of the scanning line, the corresponding position in the adjacent tooth, and the center of the dentition Tooth at the representative point based on the color information of the tooth at the corresponding reference point arranged at at least two positions symmetrical with respect to the line and the change tendency of the color information of the tooth along the corresponding scanning line It is also possible to estimate the color.
By doing in this way, based on the tendency of change in color information of teeth along a plurality of corresponding reference points and corresponding scanning lines, for example, by performing statistical processing such as average value processing and principal component analysis, The color information of the representative point can be estimated with higher accuracy.

  Advantageous Effects of Invention According to the present invention, even if a missing or discolored part such as a lesioned part of a tooth is used, an appropriate filler candidate can be presented by correctly estimating the original color of the part. Play.

Hereinafter, a dental filler selection support system 1 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 8, the dental filler selection support system 1 according to the present embodiment processes an imaging device 2 that acquires an image of a tooth T, and an image acquired by the imaging device 2. The processing device 3 for estimating the original color in the lesion site X of the tooth T, the display unit (filler presentation unit) 4 for displaying the image acquired by the imaging device 2, and the reference point A and the representative by the user's operation An input unit 5 for inputting a point B and the like, and a filler determining unit 6 for determining a candidate for a filler based on the original color of the lesion site X of the tooth T estimated by the processing device 3 are provided. The determined filler candidate is displayed on the display unit 4.

  The imaging device 2 includes a plurality of LEDs that emit light in different wavelength bands and RGB color CCDs (all of which are not shown), sequentially irradiates light from the LEDs, and substantially coincides with the center wavelength of the irradiation light. A plurality of image data of wavelengths are acquired as multiband image data. The imaging device 2 can also capture RGB images. One method for capturing RGB images is to photograph a tooth T illuminated with natural light or room light in the same manner as a normal digital camera.

The input unit 5 is a GUI, and includes a mouse, a touch pen, and the like that operate a pointer P that designates a point or a region in the image of the tooth T displayed on the display unit 4.
By operating the input unit 5, the user can surround and set the lesion area X of the tooth T to be treated in the image of the tooth T displayed on the display unit 4. The user can designate desired points A and B in the image of the tooth T displayed on the display unit 4 by operating the input unit 5.

  More specifically, when the user designates a point outside the lesion area X in the image of the tooth T, the point is a reference point for estimating the original (normal) color of the tooth T in the lesion area X. It is input as A. Further, when the user designates a point in the lesion area X in the image of the tooth T, the point is input as the representative point B of the lesion area X where the original (normal) color is estimated. ing.

  The processing device 3 performs a spectrum (in this embodiment, spectral reflectance) estimation process using the multiband image data acquired by the imaging device 2. In this spectrum 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 or the like is used to obtain the spectral reflectance for each wavelength. However, in this embodiment, since the subject is limited to the tooth T, the tooth T has the subject. By utilizing a certain feature, a 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 and the spectrum estimation matrix Mspe.

  The spectrum estimation matrix Mspe is created based on camera spectral sensitivity data, LED spectrum data, and subject (tooth) statistical data. The creation of the spectrum estimation matrix Mspe is not particularly limited, and a well-known method can be used. For example, one example is described in detail in S. K. Park and F. O. Huck “Estimation of spectral reflectance curves from multispectrum image data”, Applied Optics, 16, pp 3107-3114 (1977).

The processing device 3 obtains the spectrum of the tooth T under the illumination light used for observation by multiplying the calculated spectrum of the tooth T by the spectrum of the illumination light used for observation. The chromaticity values L ^* , a ^* and b ^* are calculated for each part of the tooth T from the obtained spectrum of the tooth T.

  Next, when the user designates a representative point B in the lesion area X via the input unit 5, the processing device 3 scans through a plurality of reference points A and representative points B outside the lesion area X input by the user. A line C is generated. When the user does not designate the representative point B, the scanning line C passing through the plurality of reference points A outside the lesion area X input by the user is generated, and the representative point B is generated on the scanning line C. .

The processing device 3 calculates chromaticity values at the representative point B in the lesion area X based on chromaticity values (color information) at a plurality of reference points A outside the lesion area X.
For example, when the user designates two reference points A at a position sandwiching the lesion area X, the processing device 3 generates a linear scanning line C connecting the two reference points A. When the user does not designate the representative point B, the processing device 3 generates the middle point of the two reference points A as the representative point B. The processing device 3 calculates the chromaticity value of the representative point B by linearly interpolating the chromaticity values of the two reference points A as the chromaticity value of the representative point B.

  Further, when the user designates three or more reference points A outside the lesion area X, the processing device 3 generates a scanning line C composed of curves passing through the three or more reference points A and the representative point B. It is supposed to be. As the curve, a curve generated by any known curve approximation such as a spline curve or a quadratic curve is set. Then, the processing device 3 calculates the chromaticity value at the representative point B by interpolating the tendency of the color change determined by the three reference points A by the smoothing function.

  The filling material determination unit 6 uses the original chromaticity value of the representative point B in the lesion area X calculated by the processing device 3, and the following well-known Kubelka-munk color prediction theoretical formula and a database in advance through experiments. A combination of fillers that can achieve a chromaticity value close to the original chromaticity value of the representative point B using the spectral scattering coefficient and spectral absorption coefficient of the filler, and candidates for the thickness dimension of the filler Is to decide. The filler determining unit 6 outputs the determined filler candidate to the display unit 4 and presents it to the user.

The operation of the dental filler selection support system 1 according to this embodiment configured as described above will be described below.
In order to present candidate fillers using the dental filler selection support system 1 according to the present embodiment, the user uses the imaging device 2 to photograph the patient's teeth T. Thereby, multiband image data and RGB image data of the patient's tooth T are obtained, and the RGB image data is output and displayed on the display unit 4, and the multiband image data is processed by the processing device.

The user operates the input unit 5 while viewing the image of the patient's tooth T displayed on the display unit 4, and first designates the lesion area X corresponding to the treatment site of the tooth T. The specification of the lesion area X is performed by operating the input unit 5 and tracing the outline of the part considered to be the lesion area X with the pointer P on the screen as shown in FIGS. 2 (a) and 2 (b). Is called.
Next, the user operates the input unit 5 to designate a plurality of (for example, two) reference points A as shown in FIG. Further, the user operates the input unit 5 to designate one representative point B in the lesion area X as shown in FIG.

Then, the processing device 3 generates a curved scanning line C that connects two reference points A and one representative point B as shown in FIG. 5, and two references as shown in FIG. The original color of the tooth T at the representative point B is estimated by linearly interpolating the color information of the tooth T at the point A.
When the user designates only two reference points A sandwiching the lesion area X without designating the representative point B, the processing device 3 forms a linear scanning line C connecting the two reference points A. Then, a representative point B is generated at the midpoint between the two reference points A. Then, the processing device 3 performs an interpolation process such as an average process based on the color information of the tooth T at the two reference points A, and estimates the original color of the tooth T at the representative point B.

  When the user designates three or more reference points A, the processing device 3 generates a curved scanning line C connecting these reference points A and one representative point B, as shown in FIG. As described above, based on the color information of the tooth T at three or more reference points A, interpolation processing such as smoothing is performed, and the original color of the tooth T at the representative point B is estimated.

  The estimated original color of the tooth T at the representative point B is input to the filler determining unit 6. Then, in the filler determination unit 6, filler combination candidates that can achieve a color close to the original color of the input tooth T and the thickness dimension of each filler are determined and displayed on the display unit 4.

  In this case, the user refers to the reference point A and the representative point B as shown in FIG. 8A by a method as shown in FIG. 8B or FIG. It is preferable to designate the point A and the representative point B. That is, the designation method shown in FIGS. 8B and 8C is a designation method in which the scanning line C connecting the reference point A and the representative point B is generated in the direction along the outline of the tooth T. .

In this way, the influence of external factors other than the tooth T (gingiva M and adjacent tooth T) can be made uniform and the color estimation accuracy of the target representative point B can be improved.
For example, for a class V cavity, the scan line C is shown in FIG. 8 (b) rather than being set in a direction that intersects the borderline between the gingiva M and the tooth T as shown in FIG. 8 (a). Therefore, setting the direction along the boundary line between the gingiva M and the tooth T is more likely to have a uniform influence on the color of the tooth T due to the presence of the gingival M, eliminating the external factor of the gingiva M. Can be considered. Further, for the class IV cavity, as shown in FIG. 8C, the influence of the background color and the adjacent tooth T can be avoided by generating the scanning line C along the outline of the tooth T. .

  The reference point A is preferably set so that the difference in chromaticity values is large. For example, by setting the color information at a plurality of reference points A to exceed a predetermined threshold, an estimation error due to an interpolation error can be prevented and the estimation accuracy can be improved.

  As described above, according to the dental filler selection support system 1 according to the present embodiment, an image of the tooth T is taken and a plurality of reference points A, or a plurality of reference points A and representative points B are designated on the image. By doing so, a candidate for a filler that can achieve the original color of the tooth T at the representative point B is presented, so that the lesion site X is cut away by a cavity formed by the cavity or the cavity formed for treatment. Even if the color is changed due to adhesion of the pigment, it is possible to assist the user in selecting a filler by presenting a candidate for a suitable filler.

  In the present embodiment, the processing device 3 generates the scanning line C so as to connect the designated reference point A and representative point B. Instead, the user uses the input unit 5. The scanning line C may be designated by drawing on the image.

  In the present embodiment, two or more reference points A are designated at both sides of the lesion area X. Instead, two or more reference points A are provided on one side of the lesion area X. May be specified. In this case, the scanning line C is set so that an extension line of the scanning line C passing through two or more reference points A passes through the lesion area X.

  In the present embodiment, the user designates the lesion area X, but instead, the processing apparatus 3 may set the lesion area X by image processing. For example, a region where the color difference with respect to the color information of the representative point B is within a predetermined threshold around the representative point B designated by the user may be set as the lesion region X. By doing in this way, the operation time by a user can be shortened. Alternatively, the user may designate one point in the lesion area X that is not the representative point B, and the area where the color difference from the color information of the designated point is within a predetermined threshold may be set as the lesion area X.

  In the present embodiment, when the user designates only two reference points A sandwiching the lesion area X, the linear scanning line C connecting these reference points A is formed. Alternatively, a plurality of scanning lines C that pass through the two reference points A may be generated and displayed on the display unit, and the user may select any one of the scanning lines C.

  In the present embodiment, a scanning line C passing through the two reference points A adjacent to the lesion area X and the lesion area X is generated, and the color of the lesion area X is based on the color information of the designated reference point A. However, instead of this, the color of the lesion area X is calculated using the color information of the reference point (corresponding reference point) A ′ arranged at a position different from the designated reference point A. It may be.

  Specifically, as shown in FIG. 9, a reference point A arranged in the vicinity of the lesion area X and a scanning line C passing through the reference point A and the lesion area X are represented by the center line D of the tooth T. Corresponding reference points A ′ and corresponding scanning lines C ′ arranged at the reversed line symmetrical positions are generated. The color information of the designated reference point A and the generated corresponding reference point A ′ is acquired, and the tendency of the color change along the corresponding scanning line C ′ is calculated.

  Then, the color is changed from the designated reference point A according to the same tendency as the color change along the corresponding scanning line C ′ from the generated corresponding reference point A ′, and the color of the lesion area X on the scanning line C is changed. Is calculated. The tendency of color change at the line symmetry position in the same tooth T, that is, gradation adjustment, is considered to be almost the same, so even if this is used, the color of the lesion area X can be calculated accurately and an appropriate filler candidate can be presented. Can do.

Note that the corresponding reference point A ′ and the corresponding scanning line C ′ are not limited to symmetrical positions in the same tooth T, but are straight lines (teeth) passing through the boundary line with the adjacent tooth T as shown in FIG. column and symmetrical positions with respect to the center is not limited to the line) D ₁ of, as shown in symmetrical positions or 12, for the straight line D ₂ passing between teeth of the upper and lower as shown in FIG. 11, the center line of the teeth D may be used corresponding reference points a 'and the corresponding scanning line C' are disposed at symmetrical positions with respect to _3. Further, by performing statistical processing such as average value processing and principal component analysis based on the color information on the plurality of corresponding reference points A ′ and corresponding scanning lines C ′, the tooth T in the target lesion area X is obtained. The estimation accuracy of the original color can be increased.

It is a block diagram which shows the dental filler selection assistance system which concerns on one Embodiment of this invention. It is a figure which shows the operation | work which designates a lesion area | region in the dental filler selection assistance system of FIG. 1, (a) The image example in designation | designated and (b) The example of an image after designation | designated, respectively. It is a figure which shows the example of an image of the reference point designated in the vicinity of the lesion area | region in the dental filler selection assistance system of FIG. It is a figure which shows the example of an image of the representative point designated in the lesion area | region in the dental filler selection assistance system of FIG. It is a figure which shows an example of the scanning line produced | generated by connecting two reference points and a representative point in the dental filler selection assistance system of FIG. FIG. 6 is a diagram illustrating linear interpolation of color information of two reference points along a scanning line generated in FIG. 5. It is a figure which shows the curve interpolation of the color information along the scanning line produced | generated when three reference points are designated in the dental filler selection assistance system of FIG. FIG. 2 is an example of scan line images that can be set in the dental filler selection support system of FIG. 1, (a) an unfavorable example in the case of a V-shaped cavity, (b) a preferred example in the case of a V-shaped cavity, It is a figure which shows a preferable example in the case of a type IV cavity respectively. It is a figure which shows the modification of the scanning line produced | generated in the dental filler selection assistance system of FIG. It is a figure which shows the other modification similar to FIG. It is a figure which shows the further another modification similar to FIG. It is a figure which shows the further another modification similar to FIG.

Explanation of symbols

A Reference point A 'Corresponding reference point B Representative point C Scan line C' Corresponding scan line D Center line of tooth T D 'Straight line passing through boundary line D "Center line of dentition M Gingiva P Pointer X Lesion area 1 Dental filling Material selection support system 2 Imaging device (color information acquisition unit)
3. Processing device (scanning line setting unit, color estimation unit, lesion area setting unit, scanning line candidate generation unit, corresponding scanning line setting unit)
4 display part (filler presentation part)
5 Input part (reference point setting part)
6 Filler determination section

Claims (10)

A reference point setting unit for setting a plurality of reference points arranged outside the lesion area of the tooth;
A scanning line setting unit for setting a scanning line passing through a plurality of reference points set by the reference point setting unit and a representative point in the lesion area;
A color information acquisition unit that acquires tooth color information at a plurality of reference points set by the reference point setting unit;
A color estimation unit that estimates the original color of the tooth at the representative point based on the color information of the tooth at each reference point acquired by the color information acquisition unit;
A filler determination unit that determines a filler based on the original color of the tooth at the representative point estimated by the color estimation unit;
A dental filler selection support system comprising: a filler presenting section that presents the filler determined by the filler determining section.   The dental filler selection support system according to claim 1, wherein the color estimation unit estimates the original color of the tooth at the representative point by interpolating tooth color information at the reference point.   The dental filler selection support system according to claim 1, further comprising a lesion area setting unit that sets the lesion area based on a tooth image. The color information acquisition unit acquires tooth color information at the representative point,
4. The dental filler selection support system according to claim 3, wherein the lesion area setting unit sets an area where a color difference from a representative point in a tooth image is a predetermined threshold value or less as a lesion area.   The scanning line setting unit generates a plurality of scanning line candidates that pass through a plurality of reference points set by the reference point setting unit and the lesion area, and the scanning line candidate generation unit And a scanning line candidate selection unit that presents the scanning line candidates generated by the above-described method and selects one scanning line candidate from the plurality of presented scanning line candidates, and the scanning line selected by the scanning line candidate selection unit The dental filler selection support system according to any one of claims 1 to 4, wherein a line candidate is set as a scanning line. A scanning line setting unit for setting a scanning line that passes through at least one reference point disposed at a position adjacent to a lesion area of a tooth and a representative point in the lesion area;
A corresponding scanning line setting unit for setting a corresponding scanning line arranged in a corresponding positional relationship with respect to the scanning line set by the scanning line setting unit;
Color information for obtaining tooth color information at the reference point, a tendency of change in tooth color information along the corresponding scanning line, and tooth color information at a corresponding reference point arranged in a corresponding positional relationship with respect to the reference point An acquisition unit;
Based on the color information of the tooth at the reference point and the corresponding reference point acquired by the color information acquisition unit, and the tendency of change in the color information of the tooth along the corresponding scanning line, the original tooth of the tooth at the representative point A color estimation unit for estimating a color;
A filler determination unit that determines a filler based on the original color of the tooth at the representative point estimated by the color estimation unit;
A dental filler selection support system comprising: a filler presenting section that presents the filler determined by the filler determining section.   The dental filling material selection support system according to claim 6, wherein the corresponding reference point and the corresponding scanning line are respectively arranged at line symmetry positions of the reference point and the scanning line with respect to a center line of the tooth.   The dentist according to claim 6, wherein the corresponding reference point and the corresponding scanning line are respectively arranged at line symmetry positions of the reference point and the scanning line with respect to a straight line passing through a boundary line between the tooth and the adjacent tooth. Filling material selection support system.   The dental filler selection support system according to claim 6, wherein the corresponding reference point and the corresponding scanning line are arranged at line symmetry positions of the reference point and the scanning line with respect to a center line of a dentition.   The color estimator includes tooth color information at the reference point, line symmetry position with respect to the center line of the tooth of the scanning line, corresponding position in adjacent teeth, and line symmetry with respect to the center line of the dentition The original color of the tooth at the representative point is estimated based on the color information of the tooth at the corresponding reference point arranged at at least two positions and the tendency of change in the color information of the tooth along the corresponding scanning line. The dental filler selection support system according to any one of claims 6 to 9.

Images