Multi-Layer Dental Composite Blank with Gradient Pressurization
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Solution Overview
Problem
Current dental prosthetic materials struggle to replicate the natural color gradient of teeth and exhibit mechanical weaknesses due to single-color materials and poor interlayer bonding.
Innovation Solution
A method of manufacturing a dental composite blank with multiple layers of different colors, involving pressurization at varying pressures before curing to enhance bonding strength and aesthetic appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single-color mill blanks (zirconia, glass ceramics) are used for dental prostheses, then manufacturing is simplified, but the ability to replicate natural tooth color gradients is lost
Solution Approach 1:
The dental prosthesis is divided into multiple layers with different colors, where each layer represents a different anatomical region of a natural tooth (enamel, dentin, pulp). This segmentation allows each layer to be optimized for its specific color and function, ultimately combining to create a realistic multi-color gradient effect that single-color materials cannot achieve
Solution Approach 2:
The invention uses composite material structures combining multiple colored layers (typically 3-7 layers) of dental ceramic materials. Each layer has specific color characteristics matching natural tooth anatomy, and they are bonded together to form a unified prosthesis that replicates the complex color gradient of natural teeth while maintaining the durability of ceramic materials
2Manufacturing precision
If hybrid ceramics with monomer color application are used to imitate natural teeth, then color gradient is improved, but mechanical strength deteriorates due to non-monolithic structure
Solution Approach 1:
The invention uses composite material structures combining multiple colored layers (typically 3-7 layers) of dental ceramic materials. Each layer has specific color characteristics matching natural tooth anatomy, and they are bonded together to form a unified prosthesis that replicates the complex color gradient of natural teeth while maintaining the durability of ceramic materials
Solution Approach 2:
The colored layers are pre-assembled into a laminate structure before the final sintering and bonding process. This preliminary lamination allows for precise color gradient configuration while ensuring proper alignment and bonding surfaces are prepared in advance, facilitating subsequent high-strength bonding without compromising mechanical integrity
3Manufacturing precision
If multiple colored layers are laminated to achieve natural tooth appearance, then aesthetic appearance is improved, but interlayer bonding strength decreases due to bubble formation
Solution Approach 1:
The colored layers are pre-assembled into a laminate structure before the final sintering and bonding process. This preliminary lamination allows for precise color gradient configuration while ensuring proper alignment and bonding surfaces are prepared in advance, facilitating subsequent high-strength bonding without compromising mechanical integrity
Solution Approach 2:
The bonding process utilizes controlled parameter changes including temperature gradients and pressure application during sintering. By carefully controlling the heating rate, peak temperature, and holding time, the process eliminates bubbles and ensures complete bonding between layers, achieving both aesthetic color gradient and reliable mechanical strength
4Productivity
If conventional single-pressure curing is used for multi-layer composites, then processing time is reduced, but bubble removal and bonding quality are insufficient
Solution Approach 1:
The curing process employs periodic pressure application with multiple stages rather than continuous single-pressure curing. The process typically involves initial low-pressure consolidation, followed by high-pressure bubble removal, and final bonding consolidation. This periodic pressure variation efficiently removes bubbles from between layers while ensuring complete bonding, achieving both high quality and reasonable processing time
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 method achieves a natural tooth color gradient and improved mechanical properties by removing bubbles and increasing interlayer bonding strength, resulting in a superior aesthetic and functional dental composite blank.
Implementation Method 1
pressurizing a laminate for a composite blank having multiple layers having different colors at a first pressure P1
Implementation Method 2
manufacturing a composite blank by curing the pressurized laminate for a composite blank
Data Source
AI summary
Proposed is a method of manufacturing a dental composite blank. The method of manufacturing the dental composite blank includes (a) pressurizing a laminate for a composite blank having multiple layers having different colors at a first pressure (P1), (b) pressurizing the laminate for a composite blank, pressurized at the first pressure, at a second pressure (P2), and (c) manufacturing a composite blank by curing the pressurized laminate for a composite blank, in which steps (a) and (b) are each independently performed once or multiple times, and the first pressure (P1) is less than or greater than the second pressure (P2), ultimately making it possible to manufacture a dental composite blank that is similar to a natural tooth and thus exhibits a superior aesthetic appearance and high interlayer bonding strength.