Dental Impression Masses Using Synergistic Surfactant Mixtures
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Solution Overview
Problem
Current dental impression materials fail to achieve a low initial and constant contact angle during the processing time, leading to inadequate wetting and detail accuracy due to hydrophobic drift, especially when interacting with damp teeth and saliva.
Innovation Solution
A dental impression mass is developed using a synergistic mixture of silicon-containing non-ionic surfactants and non-ionic fluorosurfactants, along with polyethers and polyols, which provides a low initial contact angle and maintains it throughout the processing time, ensuring excellent wetting and detail accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hydrophobic materials such as polyorganosiloxanes are used in dental impression masses, then the material structure and stability are improved, but the wetting behavior deteriorates leading to high contact angles and poor detail accuracy
Solution Approach 1:
The patent combines hydrophobic polyorganosiloxane base material with hydrophilic surfactants (specifically fluorosurfactants and silicon-containing surfactants) to create a composite impression material system. This composite approach allows the material to maintain structural stability from the polyorganosiloxane while achieving improved wetting behavior and low contact angles through the surfactant components, thereby resolving the contradiction between material stability and detail accuracy.
Solution Approach 2:
The patent modifies the surface properties of the impression material by introducing surfactants that change the contact angle parameter from high (hydrophobic) to low (hydrophilic, less than 10°). This parameter change is achieved through the synergistic interaction of fluorosurfactants and silicon-containing surfactants, which alter the surface energy and wettability of the polyorganosiloxane base material without compromising its structural integrity.
2Manufacturing precision
If surfactants are added to reduce contact angle, then wetting behavior improves, but the processing time window becomes limited due to rapid hydrophobic drift
Solution Approach 1:
The patent achieves continuous hydrophilic behavior throughout the processing time by using a synergistic combination of fluorosurfactants and silicon-containing surfactants. This combination provides sustained wetting performance from the initial application through the entire processing window, preventing the rapid hydrophobic drift that occurs with single surfactant systems. The continuous useful action is maintained because the surfactant mixture stabilizes the contact angle over time, ensuring consistent wetting behavior throughout the impression-taking process.
3Manufacturing precision
If conventional surfactants are used to achieve low contact angle, then initial wetting improves, but the contact angle increases over time due to hydrophobic drift
Solution Approach 1:
The synergistic surfactant system acts as a self-regulating mechanism where the fluorosurfactants and silicon-containing surfactants work together to maintain stable contact angle. The system provides feedback stability because the combination of surfactants creates a balanced interfacial environment that resists hydrophobic drift over time, automatically maintaining the low contact angle without external intervention throughout the processing period.
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 synergistic surfactant mixture achieves a contact angle of less than 10° within 10 seconds, allowing for precise and true-to-detail impressions by maintaining excellent hydrophilicity and flow properties on damp surfaces.
Implementation Method 1
A dental impression mass is developed using a synergistic mixture of silicon-containing non-ionic surfactants and non-ionic fluorosurfactants, along with polyethers and polyols, which provides a low initial contact angle and maintains it throughout the processing time
Implementation Method 2
The synergistic surfactant mixture achieves a contact angle of less than 10° within 10 seconds, allowing for precise and true-to-detail impressions by maintaining excellent hydrophilicity and flow properties on damp surfaces
Data Source
AI summary
Dental impression masses are described, which contain selected curable polymer systems and a mixture of a silicon-containing non-ionic surfactant that has at least one (poly)alkylene oxide group and a molecular mass of less than 6000 g/mol, and of a non-ionic fluorosurfactant containing at least one partially fluoridated or perfluoridated hydrocarbon group that is connected with a (poly)alkylene oxide group, a hydrocarbon group, an aliphatic polyhydroxy group, or heterocyclic group that contains nitrogen, by way of an oxygen atom, an amino group, a keto group, a carboxylic acid ester group, a phosphoric acid ester group, a carboxylic acid amide group and/or a phosphoric acid amide group, or of a non-ionic fluorosurfactant that has at least one partially fluoridated or perfluoridated hydrocarbon radical and at least one amino oxide radical. These dental impression masses flow extremely well onto the damp tooth under practical conditions, and an extremely detail-accurate impression forms during the processing time.