Dental Composition Monomer Ratio for Shrinkage Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dental compositions face challenges in achieving good handling properties and low polymerization shrinkage stress while maintaining desirable mechanical strength and transparency, which is difficult to attain using aromatic di(meth)acrylates.
Innovation Solution
A dental composition comprising a polyfunctional (meth)acrylic monomer with an aromatic ring but no hydroxyl group and a polyfunctional (meth)acrylic monomer with an alicyclic skeleton, in specific mass ratios, along with a filler and polymerization initiator, to enhance handling properties and reduce polymerization shrinkage stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aromatic di(meth)acrylates are used to achieve transparency and mechanical strength, then the cured product has desirable mechanical strength and transparency, but the handling properties deteriorate and polymerization shrinkage stress increases
Solution Approach 1:
The patent changes the chemical structure parameters of the polymerizable monomers by selecting specific compounds (aromatic di(meth)acrylates with controlled hydroxyl group content and alicyclic monomers with specific ring structures) to achieve the desired balance between handling properties and polymerization shrinkage stress while maintaining mechanical strength and transparency
2Strength
If aromatic di(meth)acrylates are used to achieve transparency, then the cured product has excellent transparency, but polymerization shrinkage stress increases
Solution Approach 1:
The patent uses a composite monomer system combining aromatic di(meth)acrylates (for transparency and mechanical strength) with alicyclic monomers (to reduce polymerization shrinkage stress), creating a synergistic composition that achieves both transparency and low shrinkage stress
3Reliability
If inorganic fillers with refractive index 1.50 to 1.58 are used to achieve X-ray opacity, then the cured product has radiopacity, but the matrix must have matching refractive index which complicates formulation
Solution Approach 1:
The patent controls the refractive index parameter of the matrix by selecting specific monomers and their ratios, matching it to the inorganic filler's refractive index range (1.50-1.58) to achieve both radiopacity and transparency while simplifying the formulation process
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 good handling properties, low polymerization shrinkage stress, and desirable mechanical strength with excellent transparency, as demonstrated by adhesion tests and polymerization shrinkage stress measurements.
Implementation Method 1
a polymerization initiator (C)... wherein the polymerizable monomer (A) comprises a polyfunctional (meth)acrylic monomer (a-1) having an aromatic ring but no hydroxyl group, and a polyfunctional (meth)acrylic monomer (a-2) having an alicyclic skeleton
Data Source
AI summary
A dental composition may have good handling properties and low polymerization shrinkage stress, and be capable of producing a cured product having desirable mechanical strength and excellent transparency. A dental composition may include a polymerizable monomer (A), a filler (B), and a polymerization initiator (C), wherein the polymerizable monomer (A) includes a polyfunctional (meth)acrylic monomer (a-1) having an aromatic ring but no hydroxyl group, and a polyfunctional (meth)acrylic monomer (a-2) having an alicyclic skeleton, and the polyfunctional (meth)acrylic monomer (a-1) and the polyfunctional (meth)acrylic monomer (a-2) have a mass ratio (a-1)/(a-2) of 30/70 to 95/5.