Hydrophilic Silicone Impression Material with Improved Storage Stability
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Solution Overview
Problem
Current dental impression materials face challenges in achieving a low contact angle before setting while maintaining adequate tear strength and storage stability, particularly in thin marginal areas, and existing surfactant combinations often interfere with the curing process or result in incomplete reactions.
Innovation Solution
A two-part addition silicone composition combining a fluoroaliphatic polyoxyethylene surfactant with a monofunctional alcohol alkoxylate surfactant, optimized to provide a low contact angle and high tear strength, minimizing surfactant concentration to avoid interference with the platinum catalyst and ensuring uniform mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fluorosurfactants and silicone ether compounds are used to reduce contact angle, then wettability is improved, but storage stability deteriorates
Solution Approach 1:
The patent combines fluorosurfactant and fatty alcohol ethoxylate in specific proportions to create a composite surfactant system that achieves both low contact angle and high storage stability, resolving the contradiction between wettability improvement and storage stability maintenance
Solution Approach 2:
The patent optimizes the concentration ratio of fluorosurfactant to fatty alcohol ethoxylate and controls the molecular weight parameters of the ethoxylate chain to achieve the desired balance between contact angle and storage stability
2Manufacturing precision
If surfactant concentration is increased to achieve low contact angle, then wettability is improved, but curing process interference increases
Solution Approach 1:
The patent identifies and controls critical parameters including the surfactant concentration ratio, molecular weight of ethoxylate, and composition proportions to achieve low contact angle while maintaining curing process reliability
Solution Approach 2:
The fatty alcohol ethoxylate acts as an intermediary that enables the fluorosurfactant to achieve low contact angle without interfering with the platinum catalyst, mediating between wettability requirements and curing process integrity
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 achieves a contact angle below 20 degrees and a tear strength of at least 270 PSI, with improved stability and shelf life, as demonstrated by accelerated aging tests, while maintaining the integrity of the curing process.
Implementation Method 1
a surfactant system composed of a fluorosurfactant and a fatty alcohol ethoxylate
Implementation Method 2
improves the ability of the impression material to displace oral fluids during curing. Wettability or hydrophilicity of an impression material is usually characterized by a contact angle method
Implementation Method 3
a catalyst for enabling the addition polymerization reaction
Implementation Method 4
addition curing silicone composition
Data Source
AI summary
Disclosed herein is a dental impression material that includes a two part addition curing silicone composition. The disclosed impression material contains a surfactant system composed of a fluorosurfactant and a fatty alcohol ethoxylate. The impression material disclosed herein exhibits improved storage stability than known systems using fluorosurfactants and silicone ether compounds.