One-Part Dental Adhesive Stability via Fluorocarbon Monomer
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Solution Overview
Problem
One-part dental adhesive compositions with polymerizable monomers having a fluorocarbon group exhibit instability and non-uniformity under ambient light, affecting their adhesive properties and durability.
Innovation Solution
A one-part dental adhesive composition comprising a polymerizable monomer with an acidic group, a polymerizable monomer with a fluorocarbon group, water, and a polymerization initiator, with specific weight ratios and optional components like hydroxyl-containing monomers and crosslinkable monomers, to enhance stability, adhesive properties, and bond durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymerizable monomer having a fluorocarbon group is used to enhance water absorption rate and dimensional stability, then adhesive property and bond durability are improved, but the composition becomes nonuniform and unstable to ambient light
Solution Approach 1:
The patent changes the chemical parameters of the monomer by introducing a specific fluorocarbon structure (CF3CH2O-) and controlling the degree of polymerization (n=1-10), which modifies the monomer's reactivity and stability characteristics to achieve both durability and light stability
Solution Approach 2:
The patent creates a composite adhesive system combining multiple monomers (fluorocarbon-containing monomer, hydrophilic monomer, and crosslinkable monomer) with specific ratios, where the synergistic interaction between components achieves uniformity and stability while maintaining bond durability
2Productivity
If a one-part dental adhesive composition is designed to achieve high adhesive property quickly, then application simplicity and speed are improved, but long-term bond durability deteriorates due to water absorption degradation
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating a fluorocarbon-containing monomer with specific structural features that reduce water absorption rate while maintaining the rapid curing capability through appropriate monomer selection and ratio control
Solution Approach 2:
The patent creates different functional regions within the adhesive layer through selective monomer placement, where the fluorocarbon monomer forms a water-resistant network in the bulk while hydrophilic monomers maintain penetration capability at the dentin interface
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 stability to ambient light, ensuring effective working time, excellent adhesive properties, and long-term bond durability to dentin, with uniformly mixed components for easy application.
Implementation Method 1
a polymerization initiator (D)... cured product obtained by polymerizing a polymerizable monomer
Data Source
AI summary
The present invention provides a one-part dental adhesive composition that exhibits excellent adhesive property and bond durability to a tooth structure (particularly dentin) and has high stability to ambient light, in which respective components have been mixed uniformly. The present invention is a one-part dental adhesive composition including a polymerizable monomer (A) having an acidic group, a polymerizable monomer (B) having a fluorocarbon group represented by the general formula (1), water (C), and a polymerization initiator (D). A content of the polymerizable monomer (A) having an acidic group is 5.5 to 35 parts by weight in 100 parts by weight of the total amount of polymerizable monomers. (In the formula, R1 denotes a hydrogen atom or a methyl group, and Rf denotes a fluoroalkyl group having 1 to 20 carbon atoms.)