Dental Glass Ionomer Cement for Stronger Dentin Bonding
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Solution Overview
Problem
Existing dental glass ionomer cements lack sufficient adhesiveness to dentin and mechanical strength in their cured products.
Innovation Solution
Incorporating specific water-soluble and water-insoluble radical polymerizable monomers, such as hydroxyethyl acrylate and di-2-methacryloyloxyethyl-2,2,4-triethylhexamethylene dicarbamate, into the first agent of the dental glass ionomer cement formulation to enhance adhesiveness and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional glass ionomer cement formulation is used, then the material is simple to manufacture and apply, but the adhesiveness to dentin and mechanical strength are insufficient
Solution Approach 1:
The patent uses composite materials by combining ionomer glass powder with multiple types of polymerizable monomers (hydrophilic and hydrophobic) and polycarboxylic acid polymer to create a multi-component system that achieves both high mechanical strength and adhesiveness to dentin while maintaining workability
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating specific ratios of hydrophilic monomers (containing hydroxyl or carboxyl groups) and hydrophobic monomers, along with controlling the molecular weight and composition of the polycarboxylic acid polymer, to optimize both strength and bonding properties
2Reliability
If conventional glass ionomer cement is used, then the application process is simple, but the adhesiveness to dentin is insufficient
Solution Approach 1:
The patent applies local quality by incorporating hydrophilic monomers with specific functional groups (hydroxyl or carboxyl) that locally interact with dentin surfaces through hydrogen bonding and chemical adhesion, while hydrophobic monomers provide bulk strength, creating different functional zones within the material
Solution Approach 2:
The polycarboxylic acid polymer acts as an intermediary that bridges the inorganic ionomer glass particles and the organic monomer matrix, facilitating both mechanical interlocking and chemical bonding to dentin while transferring stresses effectively
3Strength
If the cured product has high mechanical strength, then durability is improved, but shrinkage stress increases
Solution Approach 1:
The patent changes the polymerization parameters by using a combination of monomers with different polymerization rates and a water-soluble polymerization initiator that activates at body temperature, allowing gradual curing that reduces shrinkage stress while achieving high final strength
Solution Approach 2:
The composite formulation with ionomer glass powder and multiple monomer types creates a synergistic system where the inorganic filler reinforces the organic matrix, distributing shrinkage stresses and reducing overall deformation during curing
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 modified dental glass ionomer cement exhibits improved adhesiveness to dentin and mechanical strength, reducing shrinkage stress and water absorption, resulting in a more durable and effective dental filling material.
Implementation Method 1
a water-soluble compound having a radical polymerizable unsaturated bond represented by general formula (1) and a water-soluble compound having a radical polymerizable unsaturated bond represented by general formula (2)
Implementation Method 2
a first agent containing an ionomer glass powder; and a second agent containing a polycarboxylic acid polymer and water
Implementation Method 3
glass ionomer cement including a first agent containing an ionomer glass powder; and a second agent containing a polycarboxylic acid polymer and water
Data Source
AI summary
One aspect of the present invention is: a dental glass ionomer cement including a first agent containing an ionomer glass powder; and a second agent containing a polycarboxylic acid polymer and water, wherein the first agent further contains a water-soluble compound represented by general formula (1):where R1 is a hydrogen atom or a methyl group, X1 is —O— or —NH—, and L1 is an alkylene group, and a water-soluble compound represented by general formula (2):where R2 is a hydrogen atom or a methyl group, X2 is —O— or —NH—, L2 is an alkyleneoxy group, R3 is an n-valent organic group, m is an integer of 1 or more and 42 or less, and n is an integer of 2 or more and 6 or less.