Self-etching Nanoparticle Dental Adhesive for Bond Stability
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Solution Overview
Problem
Self-etching single-bottle dental adhesives face challenges such as temperature sensitivity during storage and sensitivity to application errors, particularly in solvent evaporation, which affects the reliability of the bond between the tooth structure and filling material.
Innovation Solution
A self-etching, one-component dental adhesive containing acrylate or methacrylate monomers, an acidic component, a photoinitiator, a water-miscible solvent, non-agglomerated SiO2 nanoparticles with a particle size of 5-100 nm, and a multiple crosslinker, along with thickeners like polyethylene glycol dimethacrylate, which improves the adhesive's stability and bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If self-etching single-bottle adhesive is used to simplify application process, then ease of operation is improved, but reliability deteriorates due to sensitivity to application errors in solvent evaporation
Solution Approach 1:
The patent changes the physical-chemical parameters of the adhesive formulation by incorporating specific nanoparticle fillers (5-100 nm SiO2, TiO2, ZrO2, Al2O3) and multiple crosslinkers that modify the polymerization kinetics and solvent evaporation characteristics. This allows the adhesive to maintain reliable bonding performance while preserving the simplified single-bottle application process.
2Productivity
If self-etching single-bottle adhesive is used to combine etching and infiltration steps, then productivity is improved, but reliability deteriorates due to sensitivity to application errors
Solution Approach 1:
The patent creates a composite adhesive material combining organic monomers (acrylate/methacrylate), inorganic nanoparticles (5-100 nm SiO2, TiO2, ZrO2, Al2O3), and multiple crosslinkers. This composite structure provides both the self-etching capability and the controlled polymerization behavior needed for reliable bonding, maintaining the productivity benefits of a single-bottle system.
3Ease of manufacture
If conventional self-etching adhesive formulation is used, then ease of manufacture is improved, but reliability deteriorates due to temperature sensitivity during storage
Solution Approach 1:
The patent modifies the formulation parameters by incorporating inorganic nanoparticles (5-100 nm SiO2, TiO2, ZrO2, Al2O3) as fillers and multiple crosslinkers, which change the thermal and chemical stability characteristics of the adhesive. This allows the adhesive to be manufactured easily while reducing temperature sensitivity during storage and improving storage stability.
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 adhesive achieves increased internal bond strength, improved bonding with filling materials, and enhanced storage stability at room temperature, allowing for effective use with direct and indirect filling materials, including composites and ceramics, with increased film-forming properties and high adhesion values.
Implementation Method 1
light-curing, self-etching, one-component dental adhesive
Implementation Method 2
the acidic adhesive systems either dissolve the smear layer and expose the underlying dentin or simply dissolve the smear layer
Data Source
AI summary
Light-hardening, self-corrosive, single-component dental adhesive (A) comprises at least an acrylate or methacrylate monomer; at least an acid component; at least a photo-initiator; at least a solvent, which is miscible with water; water and a non-agglomerated silica with a particle size of 5-100 nm.