Autopolymerizable Prosthetic Material with Core-Shell Particles
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Solution Overview
Problem
Current cold-curing prosthetic materials face challenges such as chipping, limited durability under mechanical stress, and aesthetic issues like yellowing and opacity, failing to meet the requirements for high-impact resistance and transparency as specified in DIN ISO 20795-1.
Innovation Solution
The combination of core-shell particles with a refractive index similar to PMMA and urethane (meth)acrylate additives in a two-component prosthetic base material, allowing for enhanced fracture toughness and transparency without the need for special processing devices, using a liquid monomer component and powdered component with an initiator system for autopolymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cold-curing prosthetic materials are used, then processing is simplified and no special devices are needed, but fracture toughness and impact resistance are insufficient
Solution Approach 1:
The patent applies composite materials by combining PMMA base material with elastomeric core-shell particles (0.1-5 wt%) and urethane (meth)acrylate (5-20 wt%). This composite structure provides both the ease of cold-curing processing of PMMA and the enhanced fracture toughness (≥1.9 MPa·m1/2) and impact resistance required by ISO 20795-1, resolving the contradiction between processing simplicity and mechanical strength.
2Strength
If liquid additives such as butadiene copolymers or silicone acrylates are added to improve fracture toughness, then impact resistance increases, but yellowing or opacity occurs
Solution Approach 1:
The patent applies local quality by selecting core-shell particles with a refractive index (1.48-1.55) matching the PMMA matrix, ensuring optical compatibility and transparency. Additionally, urethane (meth)acrylate is chosen specifically for its color stability and lack of yellowing, while still providing the required fracture toughness improvement without the harmful optical side effects of other elastomers.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the refractive index of core-shell particles to match the PMMA matrix (1.48-1.55), eliminating light scattering and opacity. The chemical composition parameters of the urethane (meth)acrylate are also optimized to ensure color stability and prevent yellowing while maintaining enhanced fracture toughness.
3Strength
If core-shell particles are used to enhance fracture toughness in cold-curing polymers, then impact resistance improves, but the short swelling time is insufficient for particle swelling
Solution Approach 1:
The patent applies parameter changes by selecting core-shell particles with optimized physical parameters (particle size 1-10 μm, refractive index 1.48-1.55) that enable sufficient swelling and functional performance within the limited cold-curing time frame, overcoming the time constraint inherent in cold-curing processes.
4Strength
If high-impact materials meeting ISO 20795-1 requirements are used, then fracture toughness is sufficient, but all current products are hot-curing materials requiring elaborate processing
Solution Approach 1:
The patent applies composite materials by formulating a cold-curing system with PMMA, core-shell particles, and urethane (meth)acrylate that achieves ISO 20795-1 fracture toughness requirements (≥1.9 MPa·m1/2) without requiring hot-curing equipment or special processing devices, thus meeting high-impact performance standards while maintaining processing simplicity.
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 solution provides a highly fracture-tough, transparent, and color-stable prosthetic material that meets the high-impact requirements of ISO 20795-1, maintaining transparency and avoiding whitening when exposed to water-containing materials, and can be processed using standard dental technology methods.
Implementation Method 1
comprising (A) at least one liquid monomer component, and (B) at least one powdered component, whereby the prosthetic material comprises in components (A) and/or (B), (i) at least one initiator or one initiator system for autopolymerisation
Data Source
AI summary
The subject matter of the invention is an autopolymerisable two-component prosthetic base material and a method for its production comprising A) at least one liquid monomer component, and B) at least one powdered component, whereby the prosthetic material comprises in components (A) and/or (B) (i) at least one initiator or one initiator system for autopolymerisation, (ii) core-shell particles modified by an elastic phase, and (iii) at least one urethane (meth)acrylate.