Redox-Curing Composition for Dental Bonding
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Solution Overview
Problem
Conventional redox-curing type compositions fail to penetrate sufficiently into tooth structures, leading to inadequate bond strength and storage stability issues due to the use of water-insoluble oxidizing agents and the presence of water, which affects the curing reaction and durability of the bonded material.
Innovation Solution
A redox-curing type composition comprising a polymerizable monomer with an acidic group, a monomer without an acidic group, a powdery inorganic peroxide with a specific particle diameter, an amine-based reducing agent, and a polymerization accelerator, all combined in a way that eliminates the need for water, allowing for efficient curing and enhanced bond strength without compromising storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-insoluble organic peroxide is used as the oxidizing agent, then the composition can be stored without water, but it fails to penetrate sufficiently into tooth structure and fails to contribute sufficiently to the curing reaction inside the tooth structure
Solution Approach 1:
The patent changes the key parameter of the oxidizing agent from water-insoluble organic peroxide to water-soluble inorganic peroxide. This parameter change enables the oxidizing agent to penetrate sufficiently into the tooth structure while maintaining storage stability through the redox system design, thereby resolving the contradiction between penetration capability and storage stability.
Solution Approach 2:
The patent creates a composite redox polymerization initiator system combining water-soluble inorganic peroxide (oxidizing agent) with a water-soluble reducing agent. This composite approach enables both sufficient penetration into tooth structure and adequate contribution to curing reaction, while maintaining storage stability through the dormant state of the redox system before activation.
2Productivity
If water is contained in the paste to dissolve the inorganic peroxide, then the curing reaction is accelerated, but the storage stability is lowered and the composition undergoes separation into hydrophilic and hydrophobic components
Solution Approach 1:
The patent segments the composition into separate components that are mixed only at the time of use. The inorganic peroxide, reducing agent, and other components are kept separate during storage to maintain stability, then mixed to enable the curing reaction. This segmentation resolves the contradiction between curing rate and storage stability by spatially separating the reactive components during storage.
Solution Approach 2:
The patent prepares all components in their respective optimal states before use, with the inorganic peroxide already dissolved in the appropriate solvent and the reducing agent prepared separately. Upon mixing, the redox reaction is immediately activated to accelerate curing. This preliminary preparation ensures both storage stability and rapid curing when needed.
3Productivity
If the composition contains water, then the inorganic peroxide dissolves and accelerates curing, but the bond durability decreases due to hydrophilic component degradation
Solution Approach 1:
The patent changes the solubility parameter of the oxidizing agent to water-soluble form, enabling the use of inorganic peroxide without adding free water to the system. The inorganic peroxide is dissolved in the monomer or other appropriate solvent, maintaining the anhydrous environment necessary for bond durability while still enabling rapid curing through the redox reaction mechanism.
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 higher bond strength to wet bodies, particularly tooth structures, while maintaining satisfactory storage stability and curing properties, even after long-term storage, without the drawbacks of water presence, such as discoloration or reduced mechanical strength.
Implementation Method 1
an oxidizing agent and a reducing agent forming a redox polymerization initiator
Implementation Method 2
a radical polymerizable monomer; and an oxidizing agent and a reducing agent forming a redox polymerization initiator
Data Source
AI summary
The present invention provides a redox-curing type composition that penetrates into a wet body, particularly into a tooth structure (dentin), is cured in an accelerated manner by the moisture contained in the wet body, thereby exhibits a higher bond strength than those of conventional redox-curing type compositions, and has satisfactory storage stability. The present invention is a redox-curing type composition including a polymerizable monomer (a) having an acidic group, a polymerizable monomer (b) having no acidic group, a powdery inorganic peroxide (c) with an average particle diameter of 0.01 to 50 µm, an amine-based reducing agent (d), and a polymerization accelerator (e). The amine-based reducing agent (d) includes an aromatic amine (d-1) and an aliphatic amine (d-2), and a weight ratio (d-1):(d-2) therebetween is 5:1 to 1:50.