Resin-Reinforced Glass Ionomer Cement for Moisture-Tolerant Surface Curing
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Solution Overview
Problem
Conventional dental resin-reinforced glass ionomer cements suffer from insufficient surface curability, water absorption expansion, and susceptibility to coloration, particularly under wet conditions, and have storage stability issues.
Innovation Solution
A dental resin-reinforced glass ionomer cement composition is formulated with a tri or more functional (meth)acrylamide-based polymerizable monomer, combined with hydroxyl group-containing (meth)acrylate-based polymerizable monomer, and a polymerization initiator, which enhances the adhesive property to the tooth substance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dental resin-reinforced glass ionomer cements are used, then the material can be applied in dental restorations, but the surface curability is insufficient especially under wet conditions
Solution Approach 1:
The patent modifies the chemical composition parameters of the cement by incorporating specific resin components and photopolymerization initiators in optimized ratios, enabling the material to cure effectively even in the presence of moisture. This resolves the contradiction by changing the material parameters to achieve reliable surface curability under wet conditions.
Solution Approach 2:
The invention creates a composite material system combining glass ionomer cement with resin reinforcement and photopolymerization capabilities. This composite approach integrates the benefits of acid-base reaction curing with light-activated polymerization, achieving superior surface curability and moisture resistance that neither component could achieve alone.
2Ease of operation
If conventional dental glass ionomer cement is used, then self-adhesive property is achieved, but mechanical properties are lower compared to resin-based materials
Solution Approach 1:
The patent merges the self-adhesive mechanism of glass ionomer cement with the mechanical strength of resin-based materials. By combining these two material systems into a single composite cement, the invention achieves both ease of operation through self-adhesion and high mechanical properties, resolving the contradiction between these two features.
Solution Approach 2:
The invention employs a composite material structure where glass ionomer particles are embedded in a resin matrix. This composite architecture allows the material to exhibit both the chemical adhesion of glass ionomer and the mechanical strength of resin, simultaneously achieving self-adhesive property and high mechanical properties.
3Adaptability or versatility
If conventional dental glass ionomer cement is used, then water is included in components providing moisture tolerance, but the surface becomes cloudy when moisture contacts at initial curing stage
Solution Approach 1:
The patent adjusts the curing kinetics parameters by incorporating photopolymerization initiators and optimizing the resin-to-monomer ratio. This enables rapid initial curing that forms a protective surface layer before moisture can cause clouding, while still maintaining overall moisture tolerance. The parameter changes resolve the contradiction by controlling the timing and rate of curing reactions.
Solution Approach 2:
The invention implements preliminary photopolymerization action that occurs rapidly upon light exposure, forming a cured surface layer before moisture contact can cause clouding. This preliminary curing action protects the surface clarity while the bulk material continues to cure and maintains moisture tolerance, resolving the surface clouding issue.
4Duration of action of moving object
If conventional dental resin-reinforced glass ionomer cement is used, then setting progresses gradually, but the operator cannot perform next operations for several minutes
Solution Approach 1:
The patent employs a two-stage curing mechanism: an initial rapid photopolymerization stage that provides immediate working time, followed by a slower acid-base reaction stage that completes the setting. This periodic action allows the operator to perform next operations during the initial rapid cure, eliminating the several-minute delay while still achieving complete setting.
Solution Approach 2:
The invention uses preliminary photopolymerization to rapidly establish the basic structure and surface integrity of the restoration. This preliminary action completes the critical portion of setting in seconds rather than minutes, allowing immediate progression to the next operational step while the material continues to mature through acid-base reaction.
5Duration of action of stationary object
If conventional dental resin-reinforced glass ionomer cement is used, then the material can be stored, but storage stability deteriorates over time
Solution Approach 1:
The patent optimizes the chemical composition parameters including inhibitor concentrations, monomer-to-polymer ratios, and pH buffering capacity to maintain stability during storage. These parameter changes prevent premature polymerization and chemical degradation, ensuring the material remains stable throughout the storage period while remaining usable when applied.
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 exhibits high surface curability, reduced water absorption expansion, excellent coloring resistance, and improved storage stability, maintaining aesthetic and functional properties over time.
Implementation Method 1
at least one of the powder material and the liquid material contains (f) polymerization initiator
Implementation Method 2
a dental glass ionomer cement represented by a dental glass ionomer cement for filling and a dental glass ionomer cement for luting generally includes polycarboxylic acid, water and acid reactive glass powder represented by fluoroaluminosilicate glass as a main component, and is cured by an acid-base reaction of the polycarboxylic acid and the acid-reactive glass powder
Data Source
AI summary
An object of the present invention is to provide a dental resin-reinforced glass ionomer cement composition which exhibit high surface curability even under wet conditions, which makes it difficult for the surface to become cloudy even if moisture comes in contact with at the initial stage of curing, exhibits high mechanical properties, low water absorption expansion and excellent coloring resistance in the cured product and is also excellent in storage stability. The dental resin-reinforced glass ionomer cement composition consisting of a powder material and a liquid material, wherein the powder material contains (a) acid-reactive glass powder, the liquid material contains (b) water, (c) polymer of acidic group-containing polymerizable monomer, (d) hydroxyl group-containing (meth)acrylate-based polymerizable monomer and (e) tri or more functional (meth)acrylamide-based polymerizable monomer, and at least one of the powder material and the liquid material contains (f) polymerization initiator.