Resin-Reinforced Glass Ionomer Cement With Low Stringiness
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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 rapid setting, and increasing the particle diameter of acid-reactive glass powder to reduce stringiness compromises mixability and mechanical characteristics.
Innovation Solution
Incorporating a specific porous inorganic filler and an organic-inorganic composite filler within defined content ranges in the dental resin-reinforced glass ionomer cement composition to minimize stringiness, improve mixability, and maintain mechanical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the particle diameter of acid-reactive glass powder is increased to reduce stringiness, then stringiness is reduced, but mixability and mechanical characteristics deteriorate
Solution Approach 1:
The patent introduces porous inorganic filler particles with a porous structure that absorbs excess moisture and controls the stringiness of the mixed material. The porous structure allows the filler to regulate water content without requiring increased particle diameter of acid-reactive glass powder, thereby maintaining both mixability and mechanical characteristics while reducing stringiness.
Solution Approach 2:
The patent creates a composite filler system combining porous inorganic filler particles with acid-reactive glass powder. This composite approach allows the porous filler to address stringiness through moisture absorption while the acid-reactive glass powder maintains mechanical strength and chemical reactivity, avoiding the need to increase glass powder particle diameter.
2Object-generated harmful factors
If the particle diameter of acid-reactive glass powder is increased to reduce stringiness, then stringiness is reduced, but mechanical characteristics deteriorate
Solution Approach 1:
The porous inorganic filler particles provide moisture regulation to reduce stringiness while maintaining a fine particle size that does not compromise mechanical characteristics. The porous structure enables controlled water absorption without requiring larger particle diameters that would reduce mechanical strength.
Solution Approach 2:
The composite system combines porous inorganic filler (for stringiness control) with acid-reactive glass powder (for mechanical strength). This allows independent optimization of each component's function without compromise - the porous filler addresses stringiness while the glass powder maintains mechanical characteristics.
3Object-generated harmful factors
If the ratio of acid-reactive glass powder is increased to reduce stringiness, then stringiness is reduced, but viscosity increases and mixability decreases
Solution Approach 1:
The porous inorganic filler particles absorb excess water and regulate the consistency of the mixed material, reducing stringiness without requiring increased glass powder ratio. This maintains optimal viscosity and mixability while eliminating the harmful stringy effect.
4Ease of operation
If waiting is performed for stringiness to decrease before shaping, then shaping can be performed, but treatment time increases and contamination risk increases
Solution Approach 1:
The porous inorganic filler particles rapidly absorb excess water and control the stringiness of the mixed material immediately after mixing, enabling shaping operations to begin right away without waiting periods. This reduces treatment time and minimizes contamination risk from saliva.
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, enhanced cavity filling properties, and improved transparency, while maintaining mechanical characteristics and reducing treatment time.
Implementation Method 1
porous inorganic filler...center portion...inorganic particle consisting of only silicon dioxide or consisting of silicon dioxide and an oxide containing one or more metal elements
Implementation Method 2
a chemical polymerization reaction of the polymerizable monomer is initiated, and setting progresses
Implementation Method 3
a type that can be set by photopolymerization by further adding a photopolymerization initiator...composition can be set at the timing intended by the operator by irradiation with light
Implementation Method 4
the acid-base reaction between the polyalkenoic acid and the acid-reactive glass powder...setting progresses
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 mixability, mechanical characteristic and transparency.To provide a dental resin-reinforced glass ionomer cement composition comprising(a) acid-reactive glass powder,(b) polyalkanoic acid,(c) water,(d) polymerizable monomer,(e) porous inorganic filler: 1% by mass or more and 15% by mass or less, and(f) polymerization initiator, whereinthe 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.