Zirconia Coloring Solution for Predictable Post-Firing Color
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Solution Overview
Problem
Conventional coloring solutions for zirconia cause significant color differences before and after firing, making it difficult for dental technicians to predict the post-firing color tone, which requires expert skills and adjustments.
Innovation Solution
A coloring solution for zirconia that includes a decolorizing coloring agent (A) and a metal ion solution (B), where the color difference before and after firing is controlled within specific ranges (ΔL*≤5.8, Δa*≤2.4, Δb*≤4.3, and ΔE*ab<6.5), allowing for accurate prediction of the post-firing color tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional coloring solution is used for zirconia, then the zirconia can be colored before firing, but the color tone changes significantly after firing, making post-firing color unpredictable
Solution Approach 1:
The patent changes the chemical parameters of the coloring solution by selecting specific metal ions (Co2+, Ni2+, Mn2+, Fe2+, Cr3+, V3+) and controlling their concentrations within specific ranges. This parameter optimization ensures that the coloring solution produces minimal color change (ΔE*ab≤6.5) after firing, resolving the contradiction between manufacturing precision and predictability
Solution Approach 2:
The patent uses organic dyes that are intentionally designed to be decomposed during firing. These short-living organic coloring agents serve as temporary color indicators during the coloring process but are completely broken down at high firing temperatures, eliminating their interference with the final color stability and resolving the color change issue
2Ease of manufacture
If a dental technician uses a conventional coloring solution, then coloring can be performed, but expert skills are required to adjust color tone and predict post-firing results
Solution Approach 1:
The coloring solution is designed to be self-regulating through its specific formulation. The solution automatically provides consistent coloring results within the specified metal ion concentration ranges, eliminating the need for expert technicians to manually adjust or predict color outcomes. The system serves itself by maintaining color stability through its inherent chemical composition
Solution Approach 2:
By defining specific parameter ranges for metal ion concentrations and controlling the decomposition behavior of organic dyes, the patent transforms an expert-dependent process into a standardized procedure. Any technician can achieve predictable results by following the specified formulation parameters, reducing the complexity barrier
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a slight color difference before and after firing, allowing for accurate prediction and adjustment of the post-firing color tone, making the process beginner-friendly and reducing reliance on expert skills.
Implementation Method 1
a coloring agent (A) that is decolorized after firing of zirconia
Implementation Method 2
a metal ion solution (B), wherein, when zirconia is colored with the coloring solution and then subjected to firing, the color difference of the zirconia before and after the firing satisfies ΔL*≤5.8, Δa*≤2.4, and Δb*≤4.3
Data Source
AI summary
The present invention provides a coloring solution for zirconia, which, when used on zirconia before firing of the zirconia, causes the zirconia to exhibit only a slight color difference before and after the firing and thus enables accurate prediction of the post-firing color tone of the zirconia. The present invention relates to a coloring solution for zirconia, comprising: a coloring agent (A) that is decolorized after firing of zirconia; and a metal ion solution (B), wherein, when zirconia is colored with the coloring solution and then subjected to firing, the color difference of the zirconia before and after the firing satisfies ΔL*≤5.8, Δa*≤2.4, and Δb*≤4.3.