One-Component Dental Adhesive via Self-Etching Monomer Merging
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Solution Overview
Problem
Conventional dental adhesive procedures are complex and technique-sensitive, requiring multiple steps including acid etching, priming, and bonding, which can be simplified to improve efficiency and stability of tooth restoration.
Innovation Solution
A one-component self-etching and self-priming dental adhesive composition containing glycerol phosphate di(meth)acrylate monomer, mono-functional and multi-functional polymerizable monomers, protic solvents, and a polymerization initiator, allowing for a single-step application without separate etching or priming, effectively bonding to both dentin and enamel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a multi-step dental adhesive procedure (acid etching, priming, bonding) is used, then bonding strength and durability are improved, but procedure complexity and technique sensitivity increase
Solution Approach 1:
The patent combines the acid etching, priming, and bonding functions into a single integrated adhesive composition. The composition contains acidic monomers that simultaneously etch the tooth surface and form adhesive bonds, eliminating the need for separate etching and priming steps while maintaining bonding strength.
Solution Approach 2:
The single-component adhesive composition performs multiple functions: it acts as an acid etchant due to its acidic monomer content, serves as a primer by penetrating and bonding to the tooth structure, and functions as the final adhesive layer. This multi-functional design simplifies the clinical procedure while preserving effective bonding.
2Ease of operation
If a simplified one-step adhesive procedure is used, then ease of operation and productivity are improved, but bonding reliability may deteriorate
Solution Approach 1:
The patent carefully controls the concentration of acidic monomers (phosphoric acid ester groups) within a specific range (0.1-10 mmol/kg) to optimize the balance between etching capability and bonding reliability. This parameter optimization ensures that the single-step procedure maintains sufficient bond strength while simplifying application.
Solution Approach 2:
The adhesive composition is a complex mixture containing multiple components including acidic monomers (glycerol phosphate diacrylate, 4-META), base monomers (Bis-GMA, HEMA), and initiators. This composite formulation allows the material to exhibit both etching and bonding properties simultaneously, ensuring reliability in a simplified procedure.
3Strength
If acidic monomer concentration is increased to improve etching capability, then bonding strength is improved, but material stability and handling properties deteriorate
Solution Approach 1:
The patent defines a precise concentration range for acidic monomers (0.1-10 mmol/kg) to achieve optimal etching capability while maintaining material stability. This controlled parameter range prevents excessive acidity that would compromise handling properties and shelf life, while still providing sufficient etching for strong bonding.
Solution Approach 2:
The acidic monomers are distributed throughout the adhesive composition at controlled concentrations, providing localized etching action where needed without overwhelming the entire material system. This ensures that etching effectiveness is achieved while the bulk material maintains its stability and handling characteristics.
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 a shear bond strength of at least 10 MPa, providing durable and efficient bonding to tooth structures with a simplified application process, reducing the need for multiple steps and improving bonding stability.
Implementation Method 1
at least one polymerization initiator, resulting in a self-etching dental adhesive composition
Implementation Method 2
acidic polymerizable monomers... glycerol phosphate di(meth)acrylate monomer... self-etching dental adhesive composition
Data Source
AI summary
A one-component self-etching self-priming dental adhesive composition is disclosed. The composition comprises glycerol phosphate di(meth)acrylate monomer, at least one mono-functional polymerizable monomer having just one ethylenically unsaturated group, at least one multi-functional polymerizable monomer having at least two ethylenically unsaturated groups, at least one aprotic solvent, at least one protic solvent, and at least one polymerization initiator.