Selective Whitening of Dental Ceramic Surfaces
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Solution Overview
Problem
Existing methods for coloring and whitening dental ceramics are unable to achieve selective, defined coloration or whitening of specific parts of the surface without diffusing into the ceramic material, leading to undesired uniform coloration.
Innovation Solution
A process involving a composition with a water-miscible but non-water-based liquid, a whitening agent containing nano-sized metal oxide particles, and a complexing agent that precipitates at pH above 5, allowing for selective application and retention on the surface of porous dental ceramics without diffusion into the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If water-based coloring or whitening solutions are applied to porous dental ceramic, then the ceramic can be colored or whitened, but the solution diffuses into the ceramic material causing undesired uniform coloration instead of selective treatment
Solution Approach 1:
The patent changes the chemical parameter of the liquid medium from water-based to water-miscible organic solvent-based (such as alcohols, glycols, or their mixtures). This parameter change fundamentally alters the interaction between the liquid and porous ceramic, preventing capillary diffusion into the material while allowing surface application and selective treatment of specific areas.
2Manufacturing precision
If existing whitening compositions are used, then whitening effect is achieved, but they form a separate layer on the surface rather than becoming part of the framework
Solution Approach 1:
The patent extracts the problematic water-based component from the composition that causes unwanted diffusion and layer formation. By removing water and replacing it with water-miscible organic solvents, the composition achieves integration into the ceramic framework without forming separate surface layers, while maintaining the whitening effect.
3Manufacturing precision
If selective application is attempted on porous ceramic, then defined areas can be treated, but the porous structure causes diffusion and loss of definition
Solution Approach 1:
The patent changes the physical-chemical parameters of the liquid medium from polar water-based to organic solvent-based, which fundamentally alters the capillary action and diffusion behavior in porous ceramic. This parameter change prevents unwanted substance loss through diffusion while maintaining sharp boundaries of selectively treated areas.
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
Enables precise and localized whitening or coloration of specific areas on dental ceramics, maintaining the material's properties and preventing unwanted diffusion, even on pre-sintered or wet surfaces, with stable composition storage and application.
Implementation Method 1
a whitening agent comprising nano-sized metal oxide particles, metal ion containing components or mixtures thereof which precipitate if the composition is adjusted to a pH above 5
Data Source
AI summary
The invention relates to a process of selectively treating parts of the surface of a porous dental ceramic comprising the steps of a) providing a composition and a porous dental ceramic having an outer surface, b) applying the composition to only a part of the outer surface of the porous dental ceramic, c) optionally drying the porous dental ceramic, and d) optionally firing the porous dental ceramic, wherein the composition comprises—a liquid being miscible with water, but not being water, —a whitening agent comprising nano-sized metal oxide particles, metal ion containing components or mixtures thereof which precipitate if the composition is adjusted to a pH above 5, —acid, complexing agent or mixture thereof. The invention also relates to a dental ceramic article obtainable by a process.