Dental Polymerizable Composition Flexibility Stain Resistance
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Solution Overview
Problem
Current dental polymerizable compositions for temporary cements, denture liners, and tissue conditioners face limitations in flexibility, shock-absorbing capacity, stain resistance, and compatibility of monomers, with issues such as limited flexibility, poor shape retention, and difficulty in dissolving certain copolymers.
Innovation Solution
A dental polymerizable composition comprising a (meth)acrylic acid ester polymer with a glass transition temperature between 25°C and 50°C, a polyfunctional (meth)acrylic acid ester monomer, and a polymerization initiator, specifically using n-propyl methacrylate, methyl methacrylate, and other esters to enhance flexibility and shock-absorbing properties, while incorporating fluorine-containing and acid group-containing esters for improved stain resistance and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an acrylic block copolymer is added to improve flexibility, then the flexibility of the cured product is improved, but the shock-absorbing capacity is not sufficiently enhanced and the polymer may have limited solubility
Solution Approach 1:
The patent changes the key parameter of glass transition temperature to a specific range (25°C to 50°C) to optimize both flexibility and shock-absorbing capacity. This parameter change resolves the contradiction by finding the optimal Tg range where the material exhibits both desired properties simultaneously, rather than relying on block copolymer structure alone.
Solution Approach 2:
The patent creates a composite material system combining (meth)acrylic acid ester polymer with specific Tg characteristics and polyfunctional (meth)acrylic acid ester monomers. This composite approach enhances both flexibility and shock-absorbing capacity while improving solubility and compatibility, resolving the limitations of single-component systems.
2Ease of operation
If a flexible polymer with low glass transition temperature is used to enhance flexibility, then flexibility is improved, but shape retention deteriorates
Solution Approach 1:
The patent optimizes the glass transition temperature parameter to a balanced range (25°C to 50°C) rather than using extremely low Tg polymers. This parameter optimization maintains flexibility while preventing excessive softness that would compromise shape retention, resolving the contradiction between these two properties.
Solution Approach 2:
The patent uses composite material formulation combining polymers with specific Tg characteristics and reactive monomers. The composite system achieves both flexibility and shape retention through the synergistic interaction of components, where the polymer provides flexibility and the crosslinking monomers provide structural integrity.
3Strength
If conventional polymerizable compositions are used for temporary cement, then bonding is achieved, but removability and flexibility are insufficient
Solution Approach 1:
The patent adjusts the glass transition temperature parameter of the polymer to (25°C to 50°C), creating a material that has sufficient bonding strength when cured but maintains enough flexibility for easy removal. This parameter optimization resolves the contradiction between strong bonding and easy removability.
Solution Approach 2:
The patent creates a dynamic material system where the cured product exhibits appropriate flexibility and shock-absorbing capacity, allowing it to adapt to different states during use and removal. The material can maintain bonding strength during function but allows for controlled removal when needed.
4Ease of operation
If certain copolymers are used to improve flexibility, then flexibility is enhanced, but compatibility and solubility of monomers deteriorate
Solution Approach 1:
The patent formulates a composite material system using (meth)acrylic acid ester polymer with specific Tg characteristics combined with polyfunctional (meth)acrylic acid ester monomers. This composite formulation achieves flexibility while maintaining excellent monomer compatibility and solubility, avoiding the incompatibility issues of conventional copolymer systems.
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 composition exhibits superior flexibility, shock-absorbing capacity, and stain resistance, making it suitable for denture liners, tissue conditioners, and temporary cements, with enhanced bonding and shape retention.
Implementation Method 1
a (meth)acrylic acid ester polymer (a) comprising a (meth)acrylic acid ester homopolymer having a glass transition temperature of 25°C to 50°C
Implementation Method 2
having tan δ at 37°C of 0.10 or more as determined by dynamic mechanical analysis
Implementation Method 3
a polymerization initiator (c)
Data Source
AI summary
A dental polymerizable composition according to the present invention includes a (meth)acrylic acid ester polymer (a), a polymerizable monomer (b) including a (meth)acrylic acid ester and/or a (meth)acrylamide, and a polymerization initiator (c). The (meth)acrylic acid ester polymer (a) includes a (meth)acrylic acid ester homopolymer having a glass transition temperature of 25°C to 50°C and/or a random copolymer of a (meth)acrylic acid ester whose homopolymer has a glass transition temperature higher than 37°C and a (meth)acrylic acid ester whose homopolymer has a glass transition temperature lower than 37°C. The (meth)acrylic acid ester polymer (a) has a glass transition temperature of 25°C to 50°C, has tan δ at 37°C of 0.10 or more as determined by dynamic mechanical analysis, and has no melting point.