KR101805027B1 - Zirconia artificial teeth method - Google Patents

Abstract

The present invention relates to a method for producing artificial teeth. According to an embodiment of the present invention, database on color information of samples of standard artificial teeth is created, color information for real teeth is measured, and the sample of standard artificial teeth close to the real teeth is selected by matching up the color information on the real teeth and the database on the color information, thereby enabling production of artificial teeth based on the selected sample of standard artificial teeth. Since production of artificial teeth similar to the real teeth of a patient can be achieved, it is possible to offer patients with excellent aesthetic effects, improved objectivity, and enhanced satisfaction. In addition, by sintering the artificial teeth through database on sintering temperature profiles optimized to the sample of the standard artificial teeth, it is possible to ensure convenience by automatizing sintering processes and also to reduce errors in the sintering processes.

Description

ZIRCONIA ARTIFICIAL TEETH METHOD [0001]

The present invention relates to a method of manufacturing a zirconia artificial tooth.

Recently, the life span of human being has been greatly increased by the development of medical technology, promotion of health care, increase of income, and improvement of welfare level. As a result, the use period of the teeth is increased, and maintenance and maintenance of the teeth are becoming important. However, there are limitations in the management of natural teeth and there are many cases in which the teeth are not congenial. Thus, artificial teeth-related dental techniques capable of replacing natural teeth such as implants and prosthesis are being developed.

In dental treatments such as implants and prostheses, it is important to replace the teeth with artificial teeth that are most similar in shape, size, and color to the patient's teeth. Especially, in case of hue, it is recognized that it is most sensitive to our eyes and that similarity of color is most important in terms of patient 's satisfaction.

In such a dental treatment, the choice of the hue of the artificial tooth, which exhibits the hue most similar to the patient's tooth, is generally determined by the subjective visual judgment of a professional worker such as a dentist or a dental technician.

However, when selecting the color tone of the artificial teeth according to the subjective visual judgment of the professional workforce, there may arise a problem that the results may vary depending on the expert knowledge and experience of the professional workforce or the same professional workforce.

Therefore, in order to solve such a problem, it is necessary to select the color tone of the artificial tooth through the quantified numerical value or the objectified data.

Korean Patent No. 10-0345051 discloses a tooth color analyzing apparatus.

Korea Patent No. 10-0345051

An object of the present invention is to provide a method of manufacturing a zirconia artificial tooth having improved aesthetics and objectivity.

1. A method comprising: measuring a roughness, a reflectance and a color coordinate of a plurality of artificial standard tooth samples to generate a database including sample-specific hue information;

Measuring the illuminance, reflectance and chromaticity coordinates of an actual tooth;

Performing a first matching of the artificial standard tooth sample and the actual teeth with respect to the chromaticity coordinates and the roughness of the actual tooth and a second matching with the artificial standard tooth sample and the chromaticity coordinates and reflectance of the actual tooth, Selecting a tooth sample; And

And fabricating an artificial tooth based on the selected artificial standard tooth sample.

2. The method of claim 1, wherein the first matching comprises three-dimensional coordinate matching with the x and y axes as the chromaticity coordinates and the z axis as the roughness, and the second matching includes the x and y axes, Wherein the method comprises three-dimensional coordinate matching on the axis.

3. The method of claim 2, wherein selecting an artificial standard tooth sample closest to the actual tooth comprises selecting the artificial standard tooth sample having coordinates of the actual tooth and coordinates of the shortest distance. Way.

4. The method according to claim 3, wherein the step of selecting an artificial standard tooth sample closest to the actual tooth includes a step of selecting the artificial standard tooth sample closest to the artificial standard having the shortest distance among the shortest distance by the first matching and the shortest distance by the second matching ≪ / RTI > wherein the method comprises selecting a tooth sample.

5. The method of claim 1, further comprising generating a sintering temperature profile database of each of said artificial standard tooth samples.

6. The method of claim 5, wherein fabricating an artificial tooth based on the artificial standard tooth sample comprises selecting and sintering a sintering temperature profile of the selected artificial standard tooth sample.

7. A method comprising: generating a hue information database of a plurality of artificial standard tooth samples;

Generating a sintering temperature profile database of each of said artificial standard tooth samples;

Measuring tone information of the actual tooth;

Selecting an artificial standard tooth sample closest to the actual tooth by matching the hue information database and the hue information of the actual tooth;

Selecting a sintering temperature profile corresponding to the selected artificial standard tooth sample; And

And sintering the artificial teeth according to the sintering temperature profile.

8. The zirconia prosthetic tooth fabrication method according to 7 above, wherein each of the sintering temperature profiles includes a first temperature-rising section, a first rest period, a second temperature-rising section, a second rest period and a first cooling section arranged sequentially .

9. The apparatus of claim 8, wherein the tone information database comprises information of samples changing from white to yellow,

Wherein the sintering temperature profile changes from a white color to a yellow color to increase the slope of the second temperature rising section.

10. The method of claim 7, wherein said tone information comprises illumination, reflectance and color coordinates.

A method for manufacturing a zirconia artificial tooth according to embodiments of the present invention includes a first matching process for a chromaticity coordinate and an illuminance of an artificial standard tooth sample and an actual tooth and a second matching process for a chromaticity coordinate and a reflectance of the artificial standard tooth sample and the actual tooth, By performing matching, it is possible to realize an artificial tooth closest to the actual tooth of the patient, so that the aesthetic property can be improved, the objectivity can be improved, and the patient can be provided with improved satisfaction.

The method of manufacturing a zirconia artificial tooth according to some embodiments of the present invention is characterized in that when the first matching result and the second matching result are different, an artificial standard tooth sample having coordinates of the actual tooth and the shortest distance coordinate is selected, The closest zirconia artificial teeth can be manufactured.

The method of manufacturing a zirconia artificial tooth according to some embodiments of the present invention can provide convenience by automating a sintering process by sintering an artificial tooth through a sintering temperature profile database optimized for an artificial standard tooth sample, The error can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart illustrating a method of manufacturing a zirconia artificial tooth according to some exemplary embodiments of the present invention.
2 is a flow chart illustrating a method of manufacturing a zirconia artificial tooth according to some exemplary embodiments of the present invention.
3 is a graph showing the sintering temperature profile according to exemplary embodiments.
Figures 4 to 15 are three-dimensional graphs showing illuminance, reflectance and color coordinates of artificial standard tooth samples.
16 is a three-dimensional graph showing the illuminance, the reflectance, and the chromaticity coordinates of an actual tooth.
17 is a graph showing the sintering temperature profile of an actual tooth.

Embodiments of the present invention include a method of generating a color information database of artificial standard tooth samples, measuring color information of an actual tooth, matching the color information database with the actual color tone information, By selecting a tooth sample and fabricating an artificial tooth according to the selected artificial standard tooth sample, it is possible to implement an artificial tooth very similar to a patient's actual tooth, thereby providing excellent aesthetics, improving objectivity, and providing improved satisfaction to the patient In addition, sintering of artificial teeth through a sintering temperature profile database optimized for artificial standard tooth samples can also provide convenience by automating the sintering process, and it is possible to provide an artificial tooth And a manufacturing method thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And shall not be construed as limited to such matters.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart illustrating a method of manufacturing a zirconia artificial tooth according to some exemplary embodiments of the present invention.

Referring to FIG. 1, for example, in step S10, a color information database of artificial standard tooth samples may be generated.

According to exemplary embodiments, the hue information may include reflectivity, luminance and color coordinates. The color coordinates may include, for example, an x-axis color coordinate and a y-axis color coordinate.

A method of manufacturing a zirconia artificial tooth according to an embodiment of the present invention includes the steps of: measuring a roughness, a reflectance, and a chromaticity coordinate of a plurality of artificial standard tooth samples to generate a database including hue information for each sample; Can be measured.

The plurality of artificial standard tooth samples are used as a reference for identifying and collating actual tooth color of a patient. A roughness, a reflectance, and a color coordinate are measured and quantified for each artificial standard tooth sample to generate a database including color tone information .

Once the database is created, the user can use the hue information data of artificial standard tooth samples at any time without newly measuring the hue information of the artificial standard tooth samples every time the artificial teeth are manufactured.

If necessary, it is also possible to periodically update the database including the color tone information by measuring the illuminance, reflectance and color coordinates of artificial standard tooth samples not included in the database.

The color tone information of the actual tooth can be measured in step S12.

According to exemplary embodiments, the hue information of the actual tooth may also include reflectance, luminance and color coordinates. The color coordinates may include, for example, an x-axis color coordinate and a y-axis color coordinate.

The method of manufacturing an artificial tooth according to an embodiment of the present invention may be able to objectively determine the color of an actual tooth through a database including color tone information of artificial standard tooth samples and color tone information data of actual teeth.

In step S14, the artificial standard tooth sample closest to the actual tooth can be selected by matching the color tone information database with the actual tooth color tone information.

In the exemplary embodiments, a first matching is performed on the color coordinates and roughness of the artificial standard tooth sample and the chromaticity coordinates and roughness of the actual tooth, and the color coordinates and reflectance of the artificial standard tooth sample, The second matching is performed on the reflectance to compare the artificial standard tooth samples with the hue information data of the actual teeth.

In some embodiments, the first matching includes three-dimensional coordinate matching with the x-axis and y-axis as the chromaticity coordinates and the z-axis as the illuminance, and the second matching includes the x- and y- As shown in FIG. This allows you to select artificial standard tooth samples that are closest to the actual teeth with more accurate figures and objectified data.

The matching can be performed by measuring the distance between the three-dimensional coordinates of the artificial standard tooth sample and the three-dimensional coordinates of the actual tooth.

In some embodiments, an artificial standard tooth sample that comes out of the three-dimensional coordinate of the actual tooth from the three-dimensional coordinate of the actual tooth according to the first matching and a tooth of the shortest distance from the three- If the artificial standard tooth sample is the same, the artificial standard tooth sample selected by the first matching and the second matching may be determined as the artificial standard tooth sample closest to the actual tooth and may be selected.

In some embodiments, an artificial standard tooth sample that comes out of the three-dimensional coordinate of the actual tooth from the three-dimensional coordinate of the actual tooth according to the first matching and a tooth of the shortest distance from the three- Wherein when the artificial standard tooth sample is different, the artificial standard tooth sample selected by the first matching and the artificial standard tooth sample selected by the second matching are compared with the artificial standard tooth sample having the three- A tooth sample can be selected.

Accordingly, the method of manufacturing a zirconia artificial tooth according to an embodiment of the present invention can produce an artificial tooth based on the selected artificial standard tooth sample, thereby realizing an artificial tooth closest to the actual tooth of the patient, In addition, it can provide improved satisfaction to the patient.

By including not only the illuminance but also the reflectance in the color tone information, it is possible to use the matching result of the reflectance and illuminance, respectively, and to use them complementarily, thereby preventing mismatching, The nearest artificial tooth can be realized.

2 is a flow chart illustrating a method of manufacturing a zirconia artificial tooth according to some exemplary embodiments of the present invention. 3 is a graph showing the sintering temperature profile according to exemplary embodiments.

Referring to FIG. 2, for example, in step S20, a hue information database of artificial standard tooth samples may be generated. Also, a database can be generated by matching sintering temperature profiles for color implementation for each sample.

The hue information may include reflectance, luminance and color coordinates as described with reference to FIG. The color coordinates may include, for example, an x-axis color coordinate and a y-axis color coordinate. Also, the color tone information database may include information of samples changing from white to yellow.

According to exemplary embodiments, the illuminance, reflectance, and color coordinates of a plurality of artificial standard tooth samples can be measured to generate a database containing sample-specific color tone information, and the illuminance, reflectance, and color coordinates of actual teeth can be measured.

3, the sintering temperature profile includes a first temperature rise period S1, a first idle period S2, a second temperature rise period S3, a second idle period S4, and a first cooling period S5. . ≪ / RTI >

According to exemplary embodiments, the first temperature rising section S1 is a section in which the temperature is gradually raised until the temperature of T1 is reached. For example, the temperature of T1 may be 900 to 1100 占 폚. The first pause period S2 can maintain the temperature of T1 for a predetermined time when the artificial tooth reaches the temperature of T1 through the first temperature rising period S1.

The second temperature rise period S3 is a period during which the temperature is re-established after the first idle period S2 is reached until the temperature T2 is reached. For example, the temperature T2 may be 1450 to 1700 占 폚 have.

In the second idle period S4, if the artificial teeth reach the temperature of T2 through the second temperature-rising section S3, the temperature of T2 is maintained for a predetermined time, and then the first cooling section S5 Lt; RTI ID = 0.0 > T2. ≪ / RTI >

In some embodiments, the sintering temperature profile may increase the slope of the second temperature-rising section (S3) as the selected artificial standard tooth sample changes from white to yellow, for example, a first idle period S2) or the second idle period (S4) to increase the slope of the second temperature rising section (S3).

In the method of manufacturing a zirconia artificial tooth according to an embodiment of the present invention, different sintering temperature profiles may be collected for each sample to generate a database. The sintering temperature profile database may be stored or integrated into a designated sintering furnace.

In step S22, the hue information of the actual tooth can be measured.

The hue information may include reflectance, luminance and color coordinates as described with reference to FIG. The color coordinates may include, for example, an x-axis color coordinate and a y-axis color coordinate. The method of manufacturing an artificial tooth according to an embodiment of the present invention may be able to objectively determine the color of an actual tooth through a database including color tone information of artificial standard tooth samples and color tone information data of actual teeth.

In step S24, the hue information database and the actual tooth tone information may be matched.

The matching can be performed by measuring the distance between the three-dimensional coordinates of the artificial standard tooth sample and the three-dimensional coordinates of the actual tooth as described with reference to FIG.

In step S26, an artificial standard tooth sample closest to the actual tooth can be selected.

As described with reference to Fig. 1, by comparing the distance between the three-dimensional coordinate of the artificial standard tooth sample and the three-dimensional coordinate of the actual tooth using the three parameters of reflectance, illumination and color coordinates, You can select a sample.

In step S28, materials including zirconia, which is the main raw material of artificial teeth, are sintered in a sintering furnace. The sintering furnace may include a controller to allow selected sintering temperature profiles of the embedded database to operate.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the invention and are not intended to limit the scope of the claims. It will be apparent to those skilled in the art that such variations and modifications are within the scope of the appended claims.

Example

1) Artificial standard tooth sample color information database creation

A zirconia artificial tooth sample manufactured by VITA Zahnfabrik was used with a spectrocolorimeter (manufactured by Konica Minolta, model: CM-2600d). The spectroscopic colorimeter used SCI (Specular Component Included) mode including regular reflection to measure objective color. The photographs were taken three times for each sample, and the illuminance, reflectance and color coordinates were measured, and the average value was calculated to generate a hue information database of the artificial standard tooth sample. The average value was obtained by using color measurement software (Spectra Magic NX) as shown in Figs. 4 to 15, where (a) in Figs. 4 to 15 shows the case where the color coordinates are the x-axis and the y- (b) show the case where the color coordinates are the x-axis and the y-axis, and the reflectance is the z-axis.

Artificial standard tooth sample Group Traits L * (D65) Y (D65) x (D65) y (D65) a * (D65) b * (D65) 0M-1 SCI 83.05 62.25 0.3231 0.3406 0.07 4.67 0M-2 SCI 77.31 52.05 0.3239 0.3413 0.14 4.75 0M-3 SCI 81.62 59.59 0.328 0.345 0.09 7.05 1M-1 SCI 78.09 53.37 0.332 0.349 0.29 8.64 1M-2 SCI 79.96 56.60 0.342 0.360 0.44 13.85 2L-1.5 SCI 75.15 48.52 0.344 0.360 0.90 13.53 2L-2.5 SCI 74.69 47.78 0.351 0.368 0.70 16.86 2M-1 SCI 74.73 47.85 0.337 0.353 0.97 10.26 2M-2 SCI 73.79 46.38 0.347 0.362 1.61 14.32 2M-3 SCI 74.21 47.03 0.358 0.372 2.01 19.29 2R-1.5 SCI 72.58 44.53 0.342 0.357 1.55 11.91 2R-2.5 SCI 74.39 47.32 0.353 0.366 2.20 16.82 3L-1.5 SCI 68.96 39.29 0.350 0.363 1.90 14.31 3L-2.5 SCI 68.23 38.28 0.361 0.373 1.97 14.28 3M-1 SCI 70.31 41.20 0.342 0.356 1.96 11.36 3M-2 SCI 72.17 43.91 0.355 0.366 2.88 16.41 3M-3 SCI 69.84 40.52 0.365 0.375 3.43 20.29 3R-1.5 SCI 69.43 39.95 0.347 0.358 2.74 12.45 3R-2.5 SCI 67.88 37.82 0.362 0.370 3.58 18.06 4L-1.5 SCI 66.38 35.81 0.356 0.367 2.98 15.87 4L-2.5 SCI 64.09 32.92 0.370 0.378 3.49 20.45 4M-1 SCI 65.30 34.43 0.348 0.358 2.85 12.17 4M-2 SCI 66.54 36.03 0.361 0.369 3.82 17.26 4M-3 SCI 65.87 35.15 0.376 0.381 4.91 22.72 4R-1.5 SCI 65.89 35.18 0.355 0.363 3.82 14.56 4R-2.5 SCI 65.74 34.99 0.370 0.374 5.11 19.87 5M-1 SCI 61.92 30.31 0.357 0.363 4.10 14.04 5M-2 SCI 62.11 30.53 0.373 0.375 5.48 19.60 5M-3 SCI 61.89 30.27 0.3876 0.3850 6.77 24.24

2) Matching actual tooth color information / artificial standard tooth sample selection

The illuminance, reflectance and chromaticity coordinates of the actual teeth were measured by taking pictures of the four surfaces of the actual teeth under the same conditions as those of the zirconia artificial standard teeth prepared by VITA Zahnfabrik. The hue information of the actual teeth had reflectivities of 41.68% to 49.31%, illuminance of 70.65 cd / m ² to 75.65 cd / m ² , and color coordinates of (0.342, 0.361) to (0.348, 0.365). The result of matching the hue information of the actual teeth with the hue information database of the artificial standard tooth samples was as shown in Fig. 16, which corresponded to the teeth of 2M-2 in Table 1.

3) Select sintering temperature profile

By selecting the sintering temperature profile of the tooth of 2M-2 in the control section of the dental sintering furnace and sintering the artificial tooth, the artificial tooth closest to the actual tooth color could be obtained.

Referring to FIG. 17, the sintering temperature profile of teeth of 2M-2 is as follows. First, heating was started at room temperature, and then heated to 1000 ° C for 1 hour and a half, then maintained at 1000 ° C for 1 hour, then slowly heated to 1590 ° C for 4 hours, and then maintained for 2 hours to remove zirconia And then quenched to room temperature in only two and a half hours.

Claims (10)

Measuring a roughness, a reflectance and a color coordinate of a plurality of artificial standard tooth samples to generate a database including sample-specific hue information;
Measuring the illuminance, reflectance and chromaticity coordinates of an actual tooth;
Performing a first matching of the artificial standard tooth sample and the actual tooth with respect to the chromaticity coordinates and the roughness of the actual tooth and a second matching with the artificial standard tooth sample and the chromaticity coordinates and reflectance of the actual tooth, Selecting a tooth sample; And
And fabricating an artificial tooth based on the selected artificial standard tooth sample.
[2] The method of claim 1, wherein the first matching includes three-dimensional coordinate matching in which a color coordinate is an x-axis and a y-axis, and an illuminance is a z-axis, Wherein the method comprises the steps of:
3. The method of claim 2, wherein selecting an artificial standard tooth sample closest to the actual tooth comprises selecting the artificial standard tooth sample having coordinates of the actual tooth and coordinates of the shortest distance.
4. The method according to claim 3, wherein the step of selecting an artificial standard tooth sample closest to the actual tooth comprises: comparing the shortest distance by the first matching and the shortest distance by the second matching, ≪ / RTI > wherein the method comprises selecting a zirconia artificial tooth.
2. The method of claim 1, wherein generating a database containing sample-specific hue information further comprises generating a sintering temperature profile database for each of the artificial standard tooth samples.
6. The method of claim 5, wherein fabricating an artificial tooth based on the artificial standard tooth sample comprises selecting and sintering a sintering temperature profile of the selected artificial standard tooth sample. Generating a hue information database of a plurality of artificial standard tooth samples;
Generating a sintering temperature profile database of each of said artificial standard tooth samples;
Measuring tone information of the actual tooth;
Selecting an artificial standard tooth sample closest to the actual tooth by matching the hue information database and the hue information of the actual tooth;
Selecting a sintering temperature profile corresponding to the selected artificial standard tooth sample; And
And sintering the artificial teeth according to the sintering temperature profile.
8. The method of claim 7, wherein each of the sintering temperature profiles comprises a first temperature-rising section, a first pause period, a second temperature-rising section, a second pause period and a first cooling section arranged sequentially.
9. The apparatus of claim 8, wherein the tone information database comprises information of samples changing from white to yellow,
Wherein the sintering temperature profile changes from a white color to a yellow color to increase the slope of the second temperature rising section.
8. The method of claim 7, wherein the tone information comprises illumination, reflectance and color coordinates.

Images