Dental Curable Composition with Long-Chain Binders and Core-Shell Modifiers
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Solution Overview
Problem
Conventional curable compositions for additive manufacturing in dentistry suffer from low impact strength, leading to unsuitable breaking behavior and adverse effects on mechanical properties like fracture toughness and bending strength due to the use of volatile impact modifiers, which also cause unpleasant odors.
Innovation Solution
A curable composition comprising 0.1 to 10% longer-chain monofunctional (meth)acrylates as a binder, 1 to 15% core-shell impact modifiers, 1 to 90% matrix material, and 0.01 to 3% initiator, with a carbon chain of at least 3 carbon atoms in the ester group, reducing volatility and improving mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If volatile impact modifiers are used to improve impact strength, then fracture toughness is improved, but unpleasant odors are generated and mechanical properties deteriorate
Solution Approach 1:
The patent changes the molecular structure parameter of the impact modifier by using longer-chain monofunctional (meth)acrylates with at least 3 carbon atoms in the ester group, replacing conventional short-chain volatile modifiers. This parameter change reduces vapor pressure and eliminates unpleasant odors while maintaining the impact strength improvement through the core-shell impact modifiers (1-15 wt%).
Solution Approach 2:
The patent creates a composite material system combining core-shell impact modifiers (1-15 wt%) with longer-chain monofunctional (meth)acrylates (0.1-10 wt%) as a binder. This composite approach integrates the impact modification function with a non-volatile binding agent, achieving both improved fracture toughness and elimination of unpleasant odors simultaneously.
2Manufacturing precision
If conventional curable compositions are used for additive manufacturing, then manufacturing precision is achieved, but impact strength is insufficient for dental applications
Solution Approach 1:
The patent enhances the conventional curable composition by incorporating core-shell impact modifiers (1-15 wt%) into the photopolymerizable composition. This composite modification maintains the manufacturing precision achieved through additive manufacturing while significantly improving impact strength to make the material suitable for dental applications.
3Strength
If volatile impact modifiers are added to improve mechanical properties, then fracture toughness is improved, but the composition becomes more volatile and odorous
Solution Approach 1:
The patent changes the volatility parameter by substituting conventional volatile impact modifiers with non-volatile longer-chain monofunctional (meth)acrylates having at least 3 carbon atoms in the ester group. This parameter change maintains fracture toughness improvement through core-shell impact modifiers while eliminating the volatility and associated odors.
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 reduces unpleasant odors and enhances fracture toughness and fracture work while maintaining bending strength, with improved processability and temperature stability, suitable for dental applications.
Implementation Method 1
the use of a longer-chain monofunctional (meth)acrylate as a binder provides the composition with mechanical properties that allow it to be used in the dental field... reduces volatility and improving mechanical properties
Implementation Method 2
core-shell impact modifiers... enhances fracture toughness and fracture work while maintaining bending strength
Implementation Method 3
curable composition... 0.01 to 3% initiator... photopolymerization process
Data Source
AI summary
The present invention relates to a curable composition for dental purposes. The invention is characterized in that the composition comprises core-shell impact modifiers and 0.1 to 10 wt. % of a binder based on long-chain mono-functional (meth)acrylic acid esters, wherein the ester group has a carbon chain with at least 3 carbon atoms. The invention also relates to the use of the composition as a dental material or a dental auxiliary material, to a dental product made of the composition, and to a method for producing the dental product.