Pasty Dental Alginate Composition Fluidity Control
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Solution Overview
Problem
The pasty dental alginate impression material composition lacks adaptability due to fixed fluidity, insufficient working time, and liquid separation issues during storage, which restrict its clinical applications.
Innovation Solution
The composition is modified by removing fillers from the base material paste and adding specific polysaccharides to regulate fluidity, while using sodium or potassium carbonate as a retarder in the base paste and sodium or potassium phosphate in the setting paste to extend working time and prevent liquid separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fillers are added to the base material paste to give formability and hardness, then the material structure is stabilized, but liquid separation occurs during storage due to filler precipitation
Solution Approach 1:
The patent removes fillers from the base material paste, extracting the problematic component that causes liquid separation during storage. The setting material paste is reformulated to provide necessary structural properties without relying on fillers in the base paste, thereby eliminating precipitation issues while maintaining material stability.
2Adaptability or versatility
If the mixing ratio of base material paste and setting material paste is changed to adjust fluidity, then fluidity adjustment is achieved, but the working time becomes insufficient or setting time is delayed
Solution Approach 1:
The patent modifies the chemical composition parameters of both pastes by incorporating retarders (sodium/potassium carbonate in base paste, sodium/potassium phosphate in setting paste). These compositional changes allow the material to maintain adequate working time across different mixing ratios while still enabling fluidity adjustment, resolving the trade-off between adaptability and working duration.
Solution Approach 2:
The retarders act as intermediary substances that mediate between the base material paste and setting material paste. They control the setting reaction rate, allowing sufficient working time to be maintained regardless of the mixing ratio, thereby enabling fluidity adjustment without compromising working time.
3Ease of operation
If polysaccharides are added to the base material paste to regulate fluidity, then fluidity control is improved, but the complexity of the composition increases
Solution Approach 1:
The added polysaccharides serve multiple functions simultaneously: they regulate fluidity, provide thickening effects, and contribute to the overall stability of the paste composition. This multi-functionality allows for improved fluidity control without proportionally increasing composition complexity, as one additive achieves multiple objectives.
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
This modification allows for adjustable fluidity, extended working time, and prevents liquid separation, enhancing the material's adaptability and performance in clinical settings.
Implementation Method 1
the setting material paste mainly comprises calcium sulfate as a setting material of alginate
Implementation Method 2
adding specific polysaccharides to regulate fluidity
Implementation Method 3
using sodium or potassium carbonate as a retarder in the base paste
Implementation Method 4
sodium or potassium phosphate in the setting paste to extend working time
Implementation Method 5
calcium sulfate and polybutene to prevent liquid separation
Data Source
AI summary
To provide a pasty dental alginate impression material composition comprising a base material paste and a setting material pas te , where fluidity of a mixture can be changed by changing the mixing ratio of both pastes, the sufficient working time can be kept, and the liquid separation in the base material paste does not occur during storage. The pasty dental alginate impression material composition comprises a base material paste composed mainly of 1-20 wt.% alginate and water, and a setting material paste composed mainly of 10-60 wt.% calcium sulfate and a liquid component which is not reacted with the calcium sulfate. The base material paste does not contain a filler substantially, but contains 0.01-5 wt.% of carbonate of sodium or potassium as a retarder, and 0.01-15 wt.%of one or more polysaccharides selected from carrageenan, pullulan, curdlan, xanthan gum, gellan gum, pectin, konjak glucomannan, xyloglucan, guar gum, gum Arabic and locust bean gum. The setting material paste contain 0.01-10 wt.% phosphate of sodium or potassium as the retarder, and 0.5-30 wt.% polybutene.