KR-102962737-B1 - A METHOD FOR MANUFACTURING A DENTAL PROSTHESIS WITH IMPROVED MATCHING ACCURACY TO AN INDIVIDUAL PATIENT'S TOOTH COLOR

KR102962737B1KR 102962737 B1KR102962737 B1KR 102962737B1KR-102962737-B1

Abstract

In one embodiment, a method for manufacturing a prosthesis that improves the matching rate with the individual patient's tooth color may be provided. The device may receive input from a user selecting at least one material of the prosthesis. The device may determine coloring conditions including a type of coloring solution for achieving the color tone of the prosthesis, a concentration of the coloring solution, and a method of applying the coloring solution to the material of the prosthesis. The device may determine sintering conditions of the material of the prosthesis by combining a sintering temperature and a sintering time. The device may sinter the material of the prosthesis according to the sintering conditions to produce a tooth prosthesis.

Inventors

김두현
박정옥

Dates

Publication Date: 20260511
Application Date: 20250507

Claims (5)

In a method for manufacturing a prosthesis that improves the match rate with the individual patient's tooth color, A step of receiving input from a user selecting at least one material of the above-mentioned prosthesis; A step of determining coloring conditions including a type of coloring solution for realizing the color tone of the above-mentioned prosthesis, a concentration of the coloring solution, and an application method for applying the coloring solution to the material of the above-mentioned prosthesis; A step of determining the sintering conditions of the material of the prosthesis by combining the sintering temperature and sintering time; A step of producing a dental prosthesis by sintering the material of the prosthesis according to the above sintering conditions; A step of determining the lightness value, the color component values of the red and green axes, and the color component values of the yellow and blue axes of the patient's natural tooth and the color of the prosthesis, respectively, using a spectrophotometer; A step of calculating the color difference (ΔE) between the natural tooth and the prosthesis using the difference between the lightness value of the patient's natural tooth and the lightness value of the prosthesis, the difference between the color component values of the red and green axes of the patient's natural tooth and the color component values of the red and green axes of the prosthesis, and the color component values of the yellow and blue axes of the patient's natural tooth and the color component values of the yellow and blue axes of the prosthesis; A step of determining the patient's natural tooth color and the shade number for each of the above-mentioned prostheses using a digital shade guide; A step of determining the difference between the shade number of the natural tooth and the shade number of the prosthesis using a shade matching table, and quantifying a digital shade-based color matching rate (Shade) corresponding to the difference; A step of determining the color matching rate by multiplying the color difference (ΔE) between the natural tooth and the prosthesis by a first weighting value and multiplying the digital shade-based color matching rate (Shade) by a second weighting value; - where the color matching rate is w1 x color difference (ΔE) between the natural tooth and the prosthesis + w2 x digital shade-based color matching rate (Shade), where w1 is the first weighting value and w2 is the second weighting value. A step of determining whether the above color tone matching rate is greater than a preset value; and If the above color tone matching rate is determined to be greater than a preset value, the step of determining the coloring condition and the sintering condition applied to the above prosthesis as the optimized coloring condition and the optimized sintering condition; A step of measuring the color of a surface-treated prosthesis after surface treatment including polishing or glazing; A step of determining the color change rate by comparing the patient's natural tooth color, the color of the fabricated prosthesis, and the color of the surface-treated prosthesis; and A step of updating the coloring conditions and sintering conditions based on the above color tone change rate; A method including
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In paragraph 1, The material of the above dental prosthesis is at least one of zirconia or lithium disilicate, and The concentration of the above coloring solution is between brix 10 and brix 30, and The above application method is at least one of the dipping, brushing, or spraying methods, and A method in which the above sintering conditions are set as a combination of a sintering temperature selected from 1200℃ to 1400℃ and a sintering time selected from 1 hour to 3 hours.

Description

A Method for Manufacturing a Dental Prosthesis with Improved Matching Accuracy to an Individual Patient's Tooth Color The following embodiments relate to a manufacturing technique for dental prostheses, and more specifically, to a prosthesis manufacturing process including sintering conditions and a coloring agent application method to improve the color matching rate with the patient's natural tooth color. When fabricating dental prosthetics (crowns, bridges, etc.), it is important to achieve a color tone that is as similar as possible to the patient's natural tooth color to ensure aesthetics. Traditionally, color tone adjustment relied on the senses of skilled technicians, but since this relies on subjective judgment, there are limitations in ensuring consistent quality. In addition, despite the introduction of digital colorimetric tools (e.g., digital shade guides, spectrophotometers), the problem of the actual color tone of the fabricated prosthesis not matching the desired color still persists. Such color inconsistencies are attributed to various variables in the prosthesis fabrication process (e.g., sintering temperature and time, coloring solution concentration, application method, and materials used). However, systematic research on the correlation between each variable and color tone, as well as standardized processes, are still lacking. FIG. 1 is an example diagram of the configuration of a device for performing a method of manufacturing a prosthesis that improves the matching rate with individual patient tooth color according to one embodiment. FIG. 2 is a flowchart illustrating a method for manufacturing a prosthesis that improves the match rate with individual patient tooth color according to one embodiment. FIG. 3 is a flowchart illustrating how a device according to one embodiment generates recommended coloring condition information. FIG. 4 is a flowchart illustrating how a device according to one embodiment generates recommended coloring condition information. FIG. 5 is an example drawing of a prosthesis in which a coloring liquid is applied according to coloring conditions determined by a device according to one embodiment. FIG. 6 is a flowchart illustrating how a device according to one embodiment determines sintering conditions. FIG. 7 is an example drawing of a prosthesis sintered according to the sintering conditions determined by the device according to one embodiment. FIG. 8 is a flowchart illustrating a method for determining the coloring conditions and sintering conditions in which the color tone matching rate is optimized by a device according to one embodiment. FIG. 9 is a drawing for explaining the color of a prosthesis determined according to a digital shade guide method according to one embodiment. FIG. 10 is a flowchart illustrating a method for an apparatus according to one embodiment to update the coloring conditions and sintering conditions in which the color tone matching rate is optimized. In the following, embodiments are described in detail with reference to the attached drawings. However, various modifications may be made to the embodiments, and thus the scope of the patent application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, and substitutions to the embodiments are included within the scope of the rights. Specific structural or functional descriptions of the embodiments are disclosed merely for illustrative purposes and may be modified and implemented in various forms. Accordingly, the embodiments are not limited to specific disclosed forms, and the scope of this specification includes modifications, equivalents, or substitutions that fall within the technical concept. Terms such as "first" or "second" may be used to describe various components, but these terms should be interpreted solely for the purpose of distinguishing one component from another. For example, the first component may be named the second component, and similarly, the second component may be named the first component. Furthermore, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly and specifically defined otherwise. In certain cases, terms have been selected at the applicant's discretion, and in such cases, their meanings will be described in detail in the relevant explanatory sections. Accordingly, terms used in this disclosure should be defined not merely by their names, but based on their meanings and the content throughout this disclosure. When it is stated that a component is "connected" to another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between. The terms used in the embodiments are for illustrative purposes only and should not be interpreted as intended to be limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise.