Non-Solvent Dental Adhesive Composition
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Solution Overview
Problem
Conventional dental adhesive compositions containing water and organic solvents lead to insufficient curing and delayed curing, necessitating the removal of these solvents, which complicates the dental restoration process and results in low initial bond strength and bond durability to tooth structures.
Innovation Solution
A non-solvent dental adhesive composition comprising an acid group-containing polymerizable monomer, a hydrophobic polymerizable monomer, and a water-soluble photopolymerization initiator with high solubility in water, which promotes polymerization at the adhesive interface without the need for solvent removal, enhancing bond strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water and organic solvent are contained in the bonding material, then the composition is easier to manufacture and apply, but insufficient curing and delayed curing occur
Solution Approach 1:
The patent extracts and removes water and organic solvent components from the bonding material formulation. This is achieved by using a solvent-free resin composition where the adhesive monomers and oligomers are applied directly without aqueous or organic solvent carriers, thereby eliminating the curing delays and insufficiencies caused by solvent interference while maintaining ease of manufacture through simplified formulation.
Solution Approach 2:
The patent changes the compositional parameters of the bonding material by eliminating solvent content entirely. The formulation uses 100% solid resin content with specific ratios of adhesive monomers (containing carboxyl, phosphoric acid, or pyrophosphoric acid groups) and crosslinking monomers, transforming the material from a solvent-based system to a solvent-free system that cures reliably without solvent removal steps.
2Reliability
If water and organic solvent are removed from the bonding material, then curing reliability improves, but the process complexity increases due to additional removal steps
Solution Approach 1:
The patent extracts the harmful solvent components (water and organic solvents) from the system entirely during the formulation stage, not during the application process. This prevents the need for additional air-blowing or heating steps to remove solvents, thereby maintaining high curing reliability while avoiding increased process complexity.
Solution Approach 2:
The patent performs the solvent removal action preliminarily during material formulation and manufacturing, creating a solvent-free bonding material before application. This preliminary extraction eliminates the need for post-application solvent removal steps, thereby simplifying the clinical procedure while ensuring reliable curing from the start.
3Reliability
If air-blowing is performed to remove water and organic solvent, then curing reliability improves, but treatment time increases
Solution Approach 1:
The patent extracts solvent components from the formulation before application, eliminating the need for air-blowing steps. The solvent-free bonding material is applied directly to the tooth structure and cured immediately under light, thereby maintaining reliable curing while significantly reducing treatment time by eliminating the solvent evaporation step.
Solution Approach 2:
The patent performs solvent removal preliminarily during material manufacturing, creating a ready-to-use solvent-free bonding material. This preliminary action eliminates the need for time-consuming air-blowing or heating steps in the clinical setting, thereby reducing treatment time while ensuring reliable curing performance.
4Ease of manufacture
If conventional photopolymerization initiators are used, then the bonding material can be cured, but adhesion to wet tooth structure is insufficient
Solution Approach 1:
The patent uses an intermediary mechanism where the carboxyl-containing, phosphoric acid-containing, or pyrophosphoric acid-containing monomers act as both adhesive agents and photopolymerization participants. These monomers chemically interact with the wet tooth structure (dentin collagen and hydroxyapatite) while simultaneously undergoing photopolymerization, thereby achieving both adequate curing and strong adhesion to wet surfaces.
Solution Approach 2:
The patent creates a composite functional system where adhesive monomers with specific functional groups (carboxyl, phosphoric acid, pyrophosphoric acid) are combined with crosslinking monomers and photopolymerization initiators in a solvent-free matrix. This composite formulation provides simultaneous capabilities of chemical adhesion to wet tooth structure and photopolymerization curing, overcoming the limitations of conventional initiators.
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 high initial bond strength and bond durability to both wet and dry tooth structures, reducing cohesive failure rates and simplifying the dental restoration process by eliminating the need for solvent removal steps.
Implementation Method 1
a water-soluble photopolymerization initiator with high solubility in water, which promotes polymerization at the adhesive interface
Data Source
AI summary
The present invention provides a non-solvent dental adhesive composition exhibiting high initial bond strength and high bond durability to a tooth structure (wet matter) and a high dentin cohesive failure rate on a tooth structure (wet matter) and being substantially free of water and an organic solvent. The present invention relates to a non-solvent dental adhesive composition comprising: an acid group-containing polymerizable monomer (A); a hydrophobic polymerizable monomer (B) having no acid group; and a water-soluble photopolymerization initiator (C) having a solubility of 10 g/L or more in water at 25°C.