JPH059104B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used for coloring for dental prosthetics (shade taking... selecting the most harmonious color by comparing the colors with adjacent teeth). Regarding coloring instruments.

(Prior art) When a tooth is lost, a prosthesis is attached to restore it. Restoration using prosthetics includes crown restoration when the defect is small, and restoration using a denture when the defect is large. The process of manufacturing a prosthesis progresses from diagnosis, treatment, impression/occlusal recording, technique, and installation. Normally, in this consistent flow, technical operations are left out of the hands of dentists due to their specialized nature, and are placed in the hands of dental technicians. Therefore, quantitative clarity in information transmission from dentists to dental technicians is required.

By the way, to make dental prosthetics more beautiful,
This can only be achieved by harmonizing color and morphology with the patient's unique remaining teeth. Conventional dental prostheses were thought of as a means of restoring function, so little consideration was given to color harmony, and at first they were only used to whiten gold or silver teeth, and they were also used for dentures. There were over 20 different colors of artificial teeth available, and they served their purpose well, and there was no need to restore the reproduction of detailed color tones. Therefore, the coloring method used was to use approximately 25 types of coloring instruments that are used when selecting artificial teeth for dentures.

(Problems to be Solved by the Invention) However, in recent years, patient needs have come to demand higher functionality and more aesthetics, along with social and economic development. Specifically, the desire was to restore the patient's occlusion, chewing, pronunciation, color tone, and morphology to be similar to that of the patient's natural teeth.As a result, porcelain crowns were invented as a material for prosthetics, and 130 types of colors were created. With the number of artificial teeth exceeding 25, it has become impossible to cope with the use of uniform coloring instruments and communicating information through ambiguous words.

Here, an example of a conventional coloring/prosthesis method will be briefly described. First, a large number of artificial teeth with different shapes and colors are taken out as appropriate, and the artificial tooth a
Attach the metal holder b to the back side of the Next, the artificial tooth a is placed on the patient's abutment (natural abutment or artificial abutment) c, and the color of the outer surface of the adjacent tooth (natural tooth or artificial tooth that has already been prosthesized) is compared. After repeating this colorimetric operation, the artificial tooth a that best matches the adjacent teeth is selected. A prosthesis is produced based on the selected artificial tooth a, and the prosthesis is completed by fixing the prosthesis to the abutment c using an adhesive or cement.

In such a coloring process, the colors are compared with the artificial tooth a protruding forward from the adjacent tooth, that is, with the outer surfaces of both teeth not on the same plane, so both are exposed to different lighting conditions. In addition, the shadow of the artificial tooth a or the holder b may be cast on the adjacent teeth. For that reason,
If a prosthesis is fabricated based on the colorimetrically selected artificial tooth a under such conditions, the prosthesis attached to the abutment c will often be perceived as having an unbalanced color tone with the adjacent teeth. . Furthermore, the color tone of the artificial tooth a during color comparison is determined by the reflected light from the metal holder b attached to the back surface of the artificial tooth a and the refraction and transmission of the enamel a ₁ and dentin a ₂ of the artificial tooth a. The color tone may be significantly different from the color tone after removing the holder b because it is visualized by a composite light of the holder b. Furthermore, when the prosthesis made based on the selected artificial tooth a is attached to the abutment using adhesive or cement, the color tone of the adhesive or cement will be reflected on the prosthesis, so it will look different from the adjacent teeth. Discrepancies in color tone often occur.

This kind of colorimetric information is transmitted from the dentist to the dental technician, and a prosthesis is manufactured based on this transmitted information, but in reality, the color tone coloring conditions mentioned above affect the prosthesis in the desired color tone. In many cases, it is not possible to obtain a desired color, which necessitates remanufacturing, or causes trouble between dentists and dental technicians regarding color tone.

The present invention has been made in view of the above, and meets the various patient needs by providing an effective coloring instrument for simple dental prosthesis that more reliably achieves color harmony with adjacent teeth. There is a lot to do.

(Means and Examples for Solving the Problems) A coloring instrument of the present invention that achieves the above object will be explained based on the accompanying drawings. Fig. 1 is a perspective view showing an example of the coloring instrument of the present invention, Fig. 2 is a diagram showing the procedure for coloring using the same instrument, Fig. 3 is a longitudinal cross-sectional view during the same test, and Fig. 4 is coloring. It is a figure similar to FIG. 3 showing another aspect of the procedure.

That is, the color measuring instrument for dental prosthesis of the present invention includes a curved thin plate shell portion 2 of the holder 1, which has an inner surface to be located at the prosthesis site and an outer surface to be compared in color with the adjacent teeth. A large number of instrument units 3 attached to the tip are set for each of the shell parts 2 of different colors to form one set, and these one set of instrument units 3...
The gist of the present invention is to select the appliance unit 3 having the shell portion 2 that harmonizes with the external appearance color of the adjacent teeth. When using, select one of these equipment units 3...
The shell part 2 harmonizes with the external appearance color of the adjacent tooth 5 by sequentially positioning the curved inner surface of the shell part 2 on the prosthetic site 4 and comparing the color with the outer surface being approximately flush with the outer surface of the adjacent tooth 5. The instrument unit 3 having the selected shell portion 2 is selected, and the color of the prosthesis is prepared based on the color tone of the selected shell portion 2.

In addition, as another aspect of coloring, the above shell part 2
When trying on the curved inner surface of the
Cement or a paint with a color tone equivalent to these is applied 6 and the same trial application as described above is repeated to form a shell part 2 that harmonizes with the composite color of the shell part 2 and the paint 6 and the external color of the adjacent tooth 5. There is a method in which the instrument unit 3 is selected and the color of the prosthesis is prepared based on the selection result. In this case, other methods include preparing a prosthesis with the same color tone as the selected shell portion 2 and attaching it to the prosthetic site 4 using an adhesive or cement with the same color tone as the paint 6. ,
It is possible to create a prosthesis with a composite color of the shell part 2 and the paint 6, and attach it to the prosthetic site 4 using a normal adhesive (colorless and transparent); in the latter case, This method is preferably adopted because it simplifies the surgeon's side work and effectively creates a prosthesis with excellent aesthetics.

The shell portion 2 of the instrument unit 3 has a thickness of 0.3 to 1.5
mm curved thin plate body with a semi-transparent surface layer 2 similar to tooth enamel and dentin
It has a two-layer structure: 1 and a back layer 22. Therefore,
The composite color of both layers 21 and 22 is visible from the surface. The outer shape of the shell portion 2 is formed into various shapes depending on the prosthesis site (front teeth, canine teeth, molars, etc.) or assuming individual differences, and is colored in as many different colors as possible. A translucent rod-shaped holder 1 is attached to the portion 2 to form an instrument unit 3. A large number of these instrument units 3 are set to form a set to constitute the coloring instrument of the present invention. Each instrument unit 3 is assigned a number depending on its shape and color tone, and after coloring, information is communicated between the departments in charge.

(Function) The coloring procedure using the above coloring instrument will be described. As shown in FIGS. 2 and 3, the holding part 1 of the instrument unit 3 is grasped, the curved inner surface of the shell part 2 is fitted onto the prosthesis site (natural abutment or artificial abutment) 4, and the shell part 2 is The color tones of the shell portion 2 and the adjacent tooth 5 are compared so that the outer surface thereof forms substantially the same plane as the outer surface of the adjacent tooth 5. In this case, the shell portion 2 and the adjacent tooth 5 are arranged in close proximity to each other, and their outer surfaces form the same plane,
Further, the shadow of the shell portion 2 is not reflected on the adjacent tooth 5, and furthermore, if the holder 1 is made of a translucent material, it is not affected by its optical influence, and the colors are compared under substantially the same conditions. Therefore, the shell part 2 of the instrument unit 3 selected by repeating this color comparison process is the one that most harmonizes with the adjacent teeth 5, and the prosthesis whose color has been prepared based on the selected shell part 2 is used as the prosthetic object. When attached to the site 4, it harmonizes with the adjacent teeth 5 and has excellent aesthetics.

The embodiment shown in FIG. 4 uses a shell part 2 whose curved inner surface is preliminarily coated with adhesive, cement, or a paint having a color tone equivalent to these, to perform trial colorimetry. In this case, since the composite color of the shell part 2 and the paint 6 and the color tone of the adjacent tooth 5 are compared, the prosthesis prepared in the most harmonious color tone of the shell part 2 is mixed with the paint. If it is attached using the same adhesive or cement as 6, the above composite color will be reproduced as is, and an aesthetic appearance that is in harmony with the adjacent teeth 5 will be obtained. If there is no adhesive that has the same color tone as the above-mentioned adhesive, etc., for convenience, a normal free paint can be applied and the composite color of this paint and the shell part 2 can be reproduced on the prosthesis. It is also possible to simplify the work.

In addition, if you apply paint of cement color (ivory color) or metal color (opaque golden yellow or silver color) to the curved inner surface of the shell part 2 as appropriate and perform the trial color comparison in the same manner as above, you can Regardless of the type of restoration, such as ceramic crowns or metal-baked porcelain crowns, color tone can be checked in advance by simulation, and the final color tone can be confirmed at the time of color matching.

(Effects of the Invention) As mentioned above, when using the color measuring instrument of the present invention, the color of adjacent teeth is compared under substantially the same optical conditions, so the color is measured and the color toning is created based on this. The resulting prosthesis has a color tone that closely resembles that of the adjacent teeth, making it possible to fully meet the needs of modern patients and significantly reducing troubles between dentists and dental technicians regarding color tone.

In addition, since the coloring instrument of the present invention has a curved thin plate shell, it can be tried on in the same plane as the adjacent teeth, and when the holder is made of a translucent material, its optical There is no influence and the accuracy of coloring is guaranteed. Furthermore, when natural teeth are used as prosthetic abutments, the amount of tooth material removed is extremely small, but even in such cases, the shell part is curved and thin, making it possible to perform trial color comparisons. It also has the added advantage of being able to confirm the thickness required for the process and the protrusion state of the prosthesis if the thickness cannot be obtained, that is, the design and observation of the prosthesis at the time of diagnosis.

As described above, the present invention has many advantages,
Its practical value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the coloring instrument of the present invention;
Figure 2 shows the procedure for coloring using the same instrument, Figure 3
The figure is a longitudinal cross-sectional view at the appropriate time for the same test, FIG. 4 is a diagram similar to FIG. 3 showing another aspect of the coloring procedure, and FIG. 5 is a diagram showing an example of the conventional coloring method. (Explanation of symbols), 1... Holder, 2... Shell portion, 3... Instrument unit, 4... Prosthetic site, 5
...Adjacent teeth, 6...Painting agent.

Claims (1)

[Claims] 1. An instrument unit 3 in which a curved thin plate-shaped shell portion 2 having an inner surface to be located at a prosthetic site and an outer surface to be compared in color with adjacent teeth is attached to the tip of a holder 1.
are set in large numbers for each of the shell parts 2 with different colors to form one set, and from this set of instrument units 3..., the above-mentioned instrument unit 3 having the shell part 2 that harmonizes with the external appearance color of the adjacent teeth is selected. Coloring instrument for dental prosthesis.