Selective Ion Exchange for Glass-Ceramic Dental Prosthesis Strength
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Solution Overview
Problem
Conventional methods for enhancing the strength of glass-ceramic dental materials, such as chemical reinforcement, often compromise aesthetic properties due to the need for high-temperature molten salt treatment, which can erode the surface and affect the appearance of dental prostheses.
Innovation Solution
A method involving an alkaline reinforcing paste with a metal ion compound and stabilizer is applied to a specific surface area of the glass-ceramic dental prosthesis, followed by heat treatment at 400° C to 550° C, allowing for targeted reinforcement without compromising the appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical reinforcement using high-temperature molten salt is applied to enhance the strength of glass-ceramic dental prostheses, then the mechanical strength is improved, but the aesthetic properties deteriorate due to surface erosion and roughness
Solution Approach 1:
The patent applies chemical reinforcement only to specific areas of the glass-ceramic prosthesis where mechanical strength is needed (such as the occlusal surface or stress-bearing areas), while leaving the aesthetic surfaces untreated. This is achieved by selectively applying reinforcing agents or controlling the reinforcement process to affect only certain regions, thus maintaining surface smoothness and aesthetic appearance in visible areas while enhancing strength in functional areas.
Solution Approach 2:
The patent divides the glass-ceramic prosthesis into different functional zones: aesthetic surfaces that require smooth appearance and structural areas that require enhanced strength. By segmenting the reinforcement application, the patent allows different surface treatments for different regions, preventing universal surface erosion while achieving localized strength enhancement.
2Strength
If chemical reinforcement is performed before glazing to maintain compressive stress, then the strength is improved, but the glazing process becomes complicated and surface quality deteriorates
Solution Approach 1:
The patent performs chemical reinforcement after the glazing process is completed, rather than before. This preliminary action of glazing first creates a protective and aesthetic surface layer, and then the chemical reinforcement is applied in a controlled manner that does not compromise the already-formed glaze, simplifying the overall process sequence while maintaining both aesthetic quality and mechanical strength.
Solution Approach 2:
The patent inverts the conventional sequence of operations by performing glazing before chemical reinforcement, rather than reinforcement before glazing. This reversal allows the glaze to form first as a protective layer, and then the reinforcement process to be applied without damaging the aesthetic surface, thereby simplifying process management and maintaining surface quality.
3Strength
If conventional chemical reinforcement is applied to thin glass-ceramic prostheses, then the strength is improved, but the surface becomes rough and aesthetic properties are compromised
Solution Approach 1:
The patent applies chemical reinforcement selectively to specific regions of thin glass-ceramic prostheses where strength enhancement is most needed, such as the occlusal surface or areas subject to mechanical stress, while preserving the smooth aesthetic surfaces. This localized approach maintains the thin profile necessary for aesthetic fit while providing targeted strength enhancement without compromising overall surface quality.
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
This approach effectively enhances the mechanical strength of glass-ceramic dental prostheses while maintaining aesthetic properties, simplifying the process and reducing environmental impact by avoiding the use of high-temperature molten salt.
Implementation Method 1
Chemical reinforcement, also known as ion strengthening is a technology that replaces smaller ions in glass materials (such as lithium ions) with larger ions (such as sodium or potassium ions) by high-temperature ion exchange process, to form a compressive stress on the surface
Implementation Method 2
The physical reinforcement, also known as thermal strengthening, is realized by rapid cooling to form compressive stress on a surface of glass
Data Source
AI summary
The present disclosure relates to a glass-ceramic dental prosthesis and a method for preparing the same. The glass-ceramic dental prosthesis has a metal ion-reinforced surface. An area of the metal ion-reinforced surface is smaller than an entire surface area of the glass-ceramic dental prosthesis. A concentration of a reinforcing metal ion on the metal ion-reinforced surface is C1 %. A concentration of the reinforcing metal ion on an other surface region of the glass-ceramic dental prosthesis is C2 %. C1 is greater than C2.