Dental Primer Weakly Acidic Compound Stability
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Solution Overview
Problem
Conventional dental primers containing silane coupling agents have poor preservation stability and shelf life due to the instability of the silane coupling agent when mixed with acid components, leading to decreased adhesive ability over time, requiring separate packaging and complicating surface modification of dental restorations.
Innovation Solution
A dental primer comprising an organic solvent, a silane coupling agent, and a weakly acidic compound with a pH of 2 or more, eliminating the need for pre-mixing with acid and enhancing preservation stability and shelf life, while maintaining excellent adhesive durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silane coupling agent is mixed with an acid component in the dental primer, then the surface modification ability is improved, but the preservation stability and shelf life deteriorate
Solution Approach 1:
The dental primer is divided into two separate components: an acid component (phosphoric acid or polyacrylic acid) and a silane coupling agent component. These components are packaged separately and mixed only immediately before use, preventing premature reaction and maintaining stability during storage while enabling effective surface modification when combined.
Solution Approach 2:
The acid component is applied first to etch and modify the dental restoration surface, creating a prepared surface. Then the silane coupling agent is applied subsequently to bond to the modified surface. This sequential preliminary action ensures each component performs its function optimally without compromising stability.
2Reliability
If a silane coupling agent is mixed with an acid component in the dental primer, then the adhesive ability is improved, but the shelf life deteriorates
Solution Approach 1:
The primer system is segmented into separate acid and silane coupling agent components stored independently. This segmentation prevents degradation reactions during storage, extending shelf life, while maintaining the ability to produce strong adhesive bonds when the components are mixed and applied in sequence.
Solution Approach 2:
The pH parameter of the primer system is dynamically controlled: stored as separate components with stable individual pH levels, then combined to create the optimal acidic environment for activation. This parameter control maintains stability during storage while enabling adhesive function during use.
3Stability of the object's composition
If a dental primer contains both silane coupling agent and acid component in separate packings, then the stability is improved, but the device complexity increases
Solution Approach 1:
While the acid and silane coupling agent are packaged separately for stability, the system merges these components into a coordinated two-step application process. The separate packings are combined through a simple sequential application procedure, achieving both stability and functional integration without excessive complexity.
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 primer provides long-term adhesive durability and extended shelf life, ensuring effective surface modification and adhesion of dental restorations without the need for pre-mixing with acid, improving the stability and performance of dental restoration adhesives.
Implementation Method 1
a dental primer which reforms a fracture surface of the dental restoration... comprising an organic solvent, a silane coupling agent and a weakly acidic compound
Data Source
AI summary
The present invention provides the dental primer for modifying surface of a dental restoration, comprising: an organic solvent, a silane coupling agent and a weakly acidic compound.