Porous-Filler Glass Ionomer Cement for Immediate Dental Shaping
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Solution Overview
Problem
Dental resin-reinforced glass ionomer cement compositions exhibit stringiness immediately after mixing, affecting operability and requiring longer treatment times due to reduced shaping capability, and increasing the risk of contamination, while increasing the ratio or particle diameter of acid-reactive glass powder compromises mechanical characteristics and mixability.
Innovation Solution
Incorporating a specific porous inorganic filler and an organic-inorganic composite filler within defined ranges in the dental resin-reinforced glass ionomer cement composition to reduce stringiness, improve cavity filling and application properties, and enhance mechanical characteristics and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the ratio or particle diameter of acid-reactive glass powder is increased to reduce stringiness, then stringiness is reduced, but viscosity increases and mixability decreases
Solution Approach 1:
The patent changes the particle size parameters of acid-reactive glass powder by introducing a specific size range (5-20 μm) and controlling the particle size distribution to reduce stringiness while maintaining mixability. This parameter optimization resolves the contradiction between reducing stringiness and preserving ease of mixing.
Solution Approach 2:
The patent creates a composite powder mixture containing acid-reactive glass powder, inert filler, and polymerizable monomer. This composite approach allows the glass powder to provide structural support and reduce stringiness while the inert filler and monomer maintain flowability and mixability, thus resolving the contradiction between these opposing properties.
2Object-generated harmful factors
If the ratio or particle diameter of acid-reactive glass powder is increased to reduce stringiness, then stringiness is reduced, but mechanical characteristics decrease
Solution Approach 1:
The patent optimizes the particle size parameter of acid-reactive glass powder to a specific range (5-20 μm) that provides sufficient structural integrity to reduce stringiness while maintaining the mechanical strength required for dental restorations. This precise parameter control resolves the contradiction between reducing stringiness and preserving mechanical characteristics.
Solution Approach 2:
The patent formulates a composite material system where acid-reactive glass powder provides structural framework to reduce stringiness, while polymerizable monomers and other components contribute to mechanical strength. The synergistic combination resolves the contradiction between these opposing requirements.
3Ease of operation
If waiting is performed until stringiness decreases to perform shaping operations, then shaping becomes easier, but treatment time increases and contamination risk increases
Solution Approach 1:
The patent modifies the compositional parameters by adding polymerizable monomers and controlling the acid-base reaction rate, which accelerates the setting process. This allows shaping operations to be performed immediately after mixing without waiting for stringiness to decrease, thus resolving the contradiction between ease of shaping and treatment time.
Solution Approach 2:
The patent incorporates polymerizable monomers that initiate rapid polymerization immediately after mixing, creating a quick-setting material that reduces stringiness rapidly. This preliminary chemical action enables immediate shaping operations without waiting, resolving the contradiction between shaping ease and time loss.
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 reduced stringiness, allowing for immediate shaping operations, improved mixability, and maintains excellent mechanical characteristics and transparency, thereby shortening treatment time and enhancing operational efficiency.
Implementation Method 1
a chemical polymerization reaction of the polymerizable monomer is initiated, and setting progresses
Implementation Method 2
There is also a type that can be set by photopolymerization by further adding a photopolymerization initiator
Implementation Method 3
in addition to the acid-base reaction between the polyalkenoic acid and the acid-reactive glass powder
Data Source
AI summary
To provide a dental resin-reinforced glass ionomer cement composition which causes less stringiness of the mixed material than conventional techniques, is excellent in cavity filling property and in application property to a dental prosthesis device, becomes soon after completion of mixing in a state that it is possible to perform shaping operation, and exhibits excellent mixiability, mechanical characteristic and transparency. To provide a dental resin-reinforced glass ionomer cement composition comprising (a) acid-reactive glass powder, (b) polyalkenoic acid, (c) water, (d) polymeraizable monomer, (e) porous inorganic filler: 1 % by mass or more and 15 % by mass or less, and (f) polymerization initiator, wherein the center portion of the (e) porous inorganic filler is an inorganic particle consisting of only silicon dioxide or consisting of silicon dioxide and an oxide containing one or more metal elements.