Composite Resin Tooth Composition for Fracture Resistance and Denture Bonding
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Solution Overview
Problem
Composite resin teeth exhibit insufficient fracture resistance when opposing teeth are made of materials with high surface hardness, such as ceramics or zirconia, and have poor adhesive properties to denture bases, leading to issues like plaque deposition and clearance formation.
Innovation Solution
Incorporating non-crosslinked polymer particles into the composite resin layer, with specific content and particle size, enhances fracture resistance and adhesive properties, preventing fracture and plaque deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a composite resin layer is formed by polymerizing and curing a curable composition containing a polyfunctional (meth)acrylate-based polymerizable monomer and inorganic fine particles to improve surface hardness and abrasion resistance, then mechanical properties are improved, but fracture resistance against high surface hardness opposing teeth (ceramics, zirconia) becomes insufficient
Solution Approach 1:
The patent changes the compositional parameters of the curable composition by incorporating specific amounts of monofunctional polymerizable monomers (1-20 mass%) and non-crosslinked polymer particles (1-20 mass%) into the polyfunctional (meth)acrylate-based system. This parameter modification allows the composite resin to achieve both high surface hardness and improved fracture resistance, resolving the contradiction between mechanical strength and reliability against occlusal pressure from hard opposing teeth.
Solution Approach 2:
The patent creates a composite material system combining polyfunctional (meth)acrylate-based polymerizable monomers with monofunctional polymerizable monomers and non-crosslinked polymer particles. This composite approach enables the resin to simultaneously exhibit high surface hardness from the polyfunctional monomer network and enhanced fracture resistance from the monofunctional monomer and non-crosslinked polymer components, allowing it to withstand occlusal pressure from ceramic and zirconia opposing teeth.
2Strength
If a composite resin layer is formed using a curable composition containing a polyfunctional (meth)acrylate-based polymerizable monomer to achieve high surface hardness, then mechanical properties are improved, but adhesive property to the denture base deteriorates
Solution Approach 1:
The patent modifies the compositional parameters by adding monofunctional polymerizable monomers (1-20 mass%) and non-crosslinked polymer particles (1-20 mass%) to the polyfunctional (meth)acrylate-based system. This parameter change reduces the crosslinking density and increases flexibility, thereby improving adhesive properties to the denture base while maintaining high surface hardness through the optimized composition balance.
Solution Approach 2:
The patent develops a composite material formulation that integrates polyfunctional (meth)acrylate-based polymerizable monomers with monofunctional polymerizable monomers and non-crosslinked polymer particles. This composite composition achieves a balance between surface hardness and adhesive property, allowing the composite resin layer to bond effectively to the denture base while maintaining mechanical strength.
3Strength
If a composite resin layer with high surface hardness is used to improve abrasion resistance, then mechanical properties are improved, but tiny clearance forms at the interface between the artificial tooth and denture base, leading to plaque and pigment deposition
Solution Approach 1:
The patent adjusts the compositional parameters by incorporating monofunctional polymerizable monomers (1-20 mass%) and non-crosslinked polymer particles (1-20 mass%) into the curable composition. This parameter modification enhances the adhesive property and reduces clearance formation at the interface, thereby preventing plaque and pigment deposition while maintaining high abrasion resistance through the optimized composite resin formulation.
Solution Approach 2:
The patent employs a composite material system combining polyfunctional (meth)acrylate-based polymerizable monomers with monofunctional polymerizable monomers and non-crosslinked polymer particles. This composite approach ensures good adhesive bonding to the denture base, preventing tiny clearance formation and subsequent plaque accumulation, while maintaining the high surface hardness and abrasion resistance required for dental applications.
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 composite resin tooth demonstrates improved fracture resistance and adhesive properties, maintaining integrity and hygiene in the oral cavity.
Implementation Method 1
the non-crosslinked polymer particles compounded to the composite resin layer absorb the stress transmitted to the composite resin layer in the case of being subjected to occlusal pressure, thereby preventing the generation of fracture
Implementation Method 2
a composite resin layer manufactured by polymerizing and curing a curable composition containing a polyfunctional (meth)acrylate-based polymerizable monomer
Data Source
AI summary
To provide a composite resin tooth that has excellent fracture resistance capable of withstanding the occlusal pressure in the oral cavity and exhibits good adhesive property to a denture base.To provide a composite resin tooth having a single layer structure or a layer structure of two or more layers, comprisinga composite resin layer consisting of a polymerized and cured product of a curable composition including polymerizable monomer (A), organic-inorganic composite filler (B), inorganic fine particle (C) and non-crosslinked polymer particle (D), whereinthe content of the non-crosslinked polymer particle (D) in the curable composition is within a range of 1% by mass or more and 5% by mass or less, andan average particle diameter of all of the inorganic particles (C) contained in the curable composition is 1 μm or less.