Dental Polymerizable Composition with Silane Coupling Agent
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Solution Overview
Problem
The addition of basic fillers like barium glass powders to dental polymerizable compositions reduces the storage stability due to adsorption of (meth)acrylates with phosphate groups, which also affects the curability of the composition.
Innovation Solution
A dental polymerizable composition is formulated with a first component containing a (meth)acrylate free of acid groups, a (meth)acrylate with a carboxyl group, a basic filler, and an organic peroxide, and a second component including a (meth)acrylate without acid groups, a vanadium compound, and a thiourea derivative, which improves curability and storage stability even with basic fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a (meth)acrylate having a phosphate group is added to improve curability, then curability is improved, but storage stability deteriorates due to adsorption by basic fillers
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance between the basic filler and the (meth)acrylate having a phosphate group. This silane coupling agent prevents direct contact and adsorption between the basic filler and the phosphate-containing (meth)acrylate, thereby maintaining storage stability while preserving curability. The silane coupling agent acts as a protective layer that eliminates the harmful interaction without compromising the beneficial curability effect.
2Measurement precision
If basic fillers are added to improve X-ray contrast, then X-ray contrast is improved, but storage stability deteriorates due to adsorption of (meth)acrylates
Solution Approach 1:
The silane coupling agent serves as a mediator between the basic filler (which provides X-ray contrast) and the (meth)acrylate components. It prevents the basic filler from adsorbing the (meth)acrylate having a phosphate group, thereby maintaining storage stability while preserving the X-ray contrast improvement provided by the basic filler.
Solution Approach 2:
The patent modifies the surface properties of the basic filler by introducing a silane coupling agent, which changes the chemical parameters of the filler surface. This parameter change prevents adsorption interactions while maintaining the physical properties (such as X-ray contrast) of the basic filler.
3Strength
If basic fillers are added to improve mechanical strength, then mechanical strength is improved, but storage stability deteriorates due to adsorption
Solution Approach 1:
The silane coupling agent acts as a protective intermediary between the basic filler and the (meth)acrylate components. It prevents direct adsorption interactions that would compromise storage stability, while allowing the basic filler to maintain its contribution to mechanical strength.
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 achieves improved curability and storage stability, maintaining high X-ray contrast of the cured products, even when basic fillers are included.
Implementation Method 1
the basic filler adsorbs the (meth)acrylate having a phosphate group, thereby reducing the storage stability of the polymerizable composition
Implementation Method 2
a first component including a (meth)acrylate free of an acid group, a (meth)acrylate having a carboxyl group, a basic filler, and an organic peroxide
Implementation Method 3
a second component including a (meth)acrylate having free of an acid group, a vanadium compound, and a thiourea derivative
Data Source
AI summary
A dental polymerizable composition includes a first component containing a (meth)acrylate free of an acid group, a (meth)acrylate having a carboxyl group, a basic filler, and an organic peroxide; and a second component containing a (meth)acrylate free of an acid group, a vanadium compound, and a thiourea derivative.