Dental Curing Composition Packability Shrinkage
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Solution Overview
Problem
Dental curing compositions face challenges in achieving a packable paste character for posterior teeth that is non-sticky, maintains form shaping properties over time, and has low polymerization shrinkage, while existing solutions either complicate production or result in significant shrinkage.
Innovation Solution
A dental curing composition with a matrix resin of high viscosity (10,000 to 17,000 mPa·s) containing a mix of high and low viscosity polymerizable monomers, along with an organic-inorganic composite filler and inorganic filler, where the low viscosity monomer content is between 0.01% to 10% by weight, enhancing filler loading and reducing adsorption issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inorganic filler having an average particle diameter of about 0.1 to 5 μm is filled at a high ratio to achieve packable paste character, then the paste character becomes suitable for posterior tooth restoration, but the polymerization shrinkage becomes significant
Solution Approach 1:
The patent uses a composite filler system combining inorganic filler (average particle diameter 0.1-5 μm) with organic-inorganic composite filler (average particle diameter several μm to 30 μm). This composite approach allows high filler loading while reducing polymerization shrinkage through the synergistic effects of different filler types and sizes, achieving both packable paste character and low shrinkage.
2Ease of operation
If organic-inorganic composite filler is used to reduce stickiness and increase filler loading, then the paste character improves, but the paste character hardens over time due to adsorption of polymerizable monomer
Solution Approach 1:
The patent creates a multi-component filler system where different filler types serve different functions: inorganic filler provides structural support and reduces shrinkage, while organic-inorganic composite filler reduces stickiness. The specific surface area control and particle size distribution ensure that monomer adsorption is balanced, maintaining paste character stability over time while achieving non-sticky properties.
3Ease of operation
If inorganic filler with large surface area is used to achieve packable paste, then the paste character improves, but the filler content becomes small and matrix resin ratio becomes high causing significant shrinkage
Solution Approach 1:
The patent segments the filler system into multiple components: inorganic filler (0.1-5 μm), organic-inorganic composite filler (several μm to 30 μm), and specific surface area control through surface treatment. This segmentation allows optimal packing density and filler content while maintaining packable paste character and minimizing polymerization shrinkage through balanced composition.
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 excellent packability, reduced stickiness, stable form shaping properties, and low polymerization shrinkage, maintaining consistency and mechanical strength, suitable for posterior tooth restoration.
Implementation Method 1
a polymeric initiator, and a low viscosity polymerizable monomer wherein the at least one polymerizable monomer of the matrix resin comprises an acryloyl and/or a methacryloyl group
Data Source
AI summary
The present invention relates to a dental curing composition to restore a lost portion of a tooth generated due to dental caries, tooth fracturing, etc. PROBLEM To provide a dental curing composition that has packability suitable for restoring a posterior tooth, that has a paste character of avoiding stickiness to a filling instrument, that is excellent in the form shaping property, whose paste character varies little over time, and that has a low polymerization shrinkage property. SOLUTION The problem is solved by a dental curing composition that includes components (a) to (d): (a) a matrix resin whose viscosity at 25°C is 10,000 to 17,000 mPa·s, (b)an organic-inorganic composite filler, (c)an inorganic filler, and (d)a polymeric initiator.