Silane Coupling Agent Urethane Spacer Dental Resin Strength
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Solution Overview
Problem
Existing medical and dental curable compositions using silane coupling agents face challenges in achieving both high mechanical strength and durability, with previous methods either lacking flexibility or exhibiting insufficient water resistance.
Innovation Solution
A novel silane coupling agent with a specific chemical structure, featuring a polymerizable group, reactive silyl group, and spacer group containing urethane groups, is used to treat inorganic fillers, enhancing their affinity to radical polymerizable monomers and improving mechanical strength, flexibility, and pressure-sensitive adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a silane coupling agent with a long alkyl chain is used to improve durability and filling rate, then the filling rate improves, but the mechanical strength and flexibility deteriorate
Solution Approach 1:
The invention changes the chemical structure parameters of the silane coupling agent by introducing a specific spacer group containing urethane groups and ether groups, rather than simply extending the alkyl chain length. This structural modification maintains flexibility while improving durability and filling rate, resolving the contradiction between filling rate and mechanical strength.
2Object-affected harmful factors
If a silane coupling agent with a fluoroalkylene group is used to improve water resistance, then water resistance improves, but the mechanical strength and durability deteriorate
Solution Approach 1:
The invention modifies the chemical structure by incorporating urethane groups and ether groups in the spacer, which provide both water resistance and mechanical strength. This structural parameter change resolves the contradiction between water resistance and durability, achieving both properties simultaneously.
3Ease of manufacture
If γ-methacryloxypropyltrimethoxysilane (KBM-503) is used as the silane coupling agent, then ease of manufacture is maintained, but hydrolysis resistance and durability worsen
Solution Approach 1:
The invention changes the chemical structure parameters by introducing urethane groups and ether groups in the spacer of the silane coupling agent. This modification improves hydrolysis resistance and durability while maintaining ease of manufacture through established silane coupling agent synthesis methods.
4Strength
If a silane coupling agent with many polymerizable groups is used to improve mechanical strength, then mechanical strength improves, but flexibility and pressure-sensitive adhesion deteriorate
Solution Approach 1:
The invention changes the chemical structure by incorporating a spacer group with urethane groups and ether groups, which provides flexibility and pressure-sensitive adhesion. This structural modification allows the silane coupling agent to maintain mechanical strength while improving flexibility and adhesion properties.
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 novel silane coupling agent significantly enhances the mechanical strength, flexibility, and durability of medical and dental curable compositions by improving the affinity between inorganic fillers and radical polymerizable monomers, leading to better filling properties and reduced polymerization shrinkage.
Implementation Method 1
there were problems that hydrolysis tends to progress due to low hydrophobicity
Implementation Method 2
a reactive silyl group
Implementation Method 3
An uncured body (before radical polymerization) paste is filled in a defect part such as teeth, and then external energy such as photoirradiation is imparted, thus obtaining a radical polymerization cured body
Implementation Method 4
having a polymerizable group to attempt to improve the wettability and to improve the mechanical strength
Data Source
AI summary
The present invention relate to a novel silane coupling agent and a medical and/or dental curable composition comprising the same. It is an object of the present invention to provide a novel silane coupling agent that imparts high affinity to a radical polymerizable monomer, thereby imparting high mechanical strength, flexibility and durability when used for a medical and/or dental curable composition, and an inorganic filler surface-treated with the novel silane coupling agent and a novel medical and/or dental curable composition. A silane coupling agent including repeating units such as a urethane bond and polyethylene glycol (ether bond) at a specific position is used.