Curable Dental Compositions with Low Viscosity and High Strength
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Solution Overview
Problem
Dental composites face challenges in balancing refractive index matching between resin and filler, viscosity, strength, handling properties, cure time, depth of cure, volume shrinkage, shrinkage stress, aesthetics, and biocompatibility, especially under demanding conditions in the mouth.
Innovation Solution
The development of curable dental compositions comprising a polymerizable resin and fillers, where the resin includes specific compounds with amine-, oxygen-, or sulfur-containing linkages, and the fillers are nano-sized inorganic metal oxide materials, such as silica and zirconia, to achieve a desirable refractive index match, low viscosity, and enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If filler loading is increased to improve strength, then the viscosity of the composite increases, which negatively impacts processability and flowability
Solution Approach 1:
The patent changes the chemical parameters of the resin matrix by introducing specific compounds with amine-, oxygen-, or sulfur-containing linkages. These compositional changes reduce the viscosity of the matrix, allowing high filler loading (improving strength) while maintaining acceptable processability and flowability.
2Shape
If the refractive index of the matrix is increased to match filler materials, then aesthetic appearance improves, but the viscosity tends to increase
Solution Approach 1:
The patent simultaneously adjusts multiple parameters of the resin matrix: increasing the refractive index (through specific chemical compounds) while controlling viscosity (through the same compound selection and molecular structure design). This resolves the trade-off by finding a compositional sweet spot that achieves both optical matching and workability.
3Length of stationary object
If the composition is designed for deep restorations, then the depth of cure improves, but shrinkage stress increases
Solution Approach 1:
The patent modifies the chemical composition and molecular architecture of the resin matrix to reduce polymerization shrinkage. This allows deep restorations to be cured effectively while minimizing the shrinkage stress that would otherwise compromise the tooth-restoration interface.
4Adaptability or versatility
If multiple functional requirements are incorporated into a single composition, then the versatility improves, but the composition complexity increases
Solution Approach 1:
The patent designs a resin matrix with multi-functional chemical compounds that simultaneously provide: refractive index matching, viscosity control, shrinkage reduction, and biocompatibility. This consolidates multiple functions into a single compositional system rather than requiring separate additives for each function.
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
These compositions exhibit a balanced set of desirable properties, including low viscosity, high strength, effective curing depth, reduced shrinkage stress, and aesthetic appeal, while maintaining biocompatibility and flowability, suitable for deep restorations and various dental applications.
Implementation Method 1
curable dental compositions... polymerizable resin... effective curing depth
Data Source
AI summary
A curable dental composition includes a compound having structural formula (A) where X is an amine-, oxygen-, or sulfur-containing linkage; Y is an amine-, oxygen-, or sulfur-containing linkage; n is 1-15; m is 1-5; p is 1-5, with the proviso that when p is greater than 1, m is 1; each R1 is, independently, an alkyl or aryl group having 2 to 20 carbon atoms that is linear, branched, cyclic, or some combination thereof, and optionally includes one or more heteroatoms or unsaturated bonds; and each R2 is, independently, a hydrogen atom or CH3 The composition also includes filler. The filler is present in an amount of at least 25 wt.-%, based on the total weight of the curable dental composition.