Polyether-Modified Siloxane Reduces Dental Impression Stickiness
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Solution Overview
Problem
Dental impression materials often exhibit stickiness after hardening, especially when polyether surfactants are present, which can lead to incorrect assumptions about the completion of the hardening process and make handling difficult.
Innovation Solution
Incorporating a polyether-modified polydimethyl siloxane with specific water solubility and viscosity into the dental composition to reduce stickiness while maintaining or improving mechanical properties such as tensile strength and elongation at break.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyether surfactants are added to improve hydrophilicity, then initial hydrophilicity is improved, but stickiness after hardening increases
Solution Approach 1:
The patent changes the chemical composition parameter by introducing polyether-modified polydimethyl siloxane with specific molecular weight (10,000-100,000 g/mol) and structure (formula I with specific R1 groups), which alters the surface properties of the hardened material to reduce stickiness while preserving hydrophilicity
Solution Approach 2:
The patent creates a composite system by combining polyether-modified polydimethyl siloxane with the polyether-based pre-polymer and surfactants, where the siloxane component provides anti-stickiness while the polyether components maintain hydrophilicity, achieving both desired properties simultaneously
2Reliability
If polyether-based impression materials are used, then hydrophilicity is improved, but stickiness after hardening occurs
Solution Approach 1:
The patent modifies the material composition by incorporating polyether-modified polydimethyl siloxane with controlled molecular weight and structure, which changes the surface energy and wettability parameters of the hardened material to eliminate stickiness while preserving the hydrophilic character necessary for dental applications
3Reliability
If surfactants are present in the composition, then initial wetting is improved, but stickiness develops during storage in water
Solution Approach 1:
The patent introduces polyether-modified polydimethyl siloxane as an intermediary substance that mediates between the surfactant and water environment, preventing the surfactant from causing excessive stickiness during storage while allowing it to perform its wetting function initially
Solution Approach 2:
The patent adjusts the compositional parameters by adding polyether-modified polydimethyl siloxane with specific structural parameters (formula I, molecular weight 10,000-100,000 g/mol), which modifies the physical-chemical parameters of the composition to stabilize it against stickiness development during water storage
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 use of polyether-modified polydimethyl siloxane effectively reduces stickiness in hardened dental impression materials, ensuring proper handling and maintaining mechanical integrity, with improved hydrophilicity and water contact angle properties.
Implementation Method 1
the Base Paste or the Catalyst Paste or the Base Paste and the Catalyst Paste comprising in addition a polyether-modified polydimethyl siloxane... for reducing the stickiness of a dental composition after hardening
Implementation Method 2
which cure by a cationic ring-opening polymerization of aziridines
Implementation Method 3
As mentioned above, for certain application like dental impression materials an even more hydrophilic polyether material is desired... the polyether-modified polydimethyl siloxane with specific water solubility
Data Source
AI summary
The invention relates to a composition, in particular a dental composition, provided as a kit of parts comprising a Base Paste and an Initiator Paste being separated before use, the Base Paste comprising a cationically curable pre-polymer comprising a polyether backbone and at least two reactive functional moieties, filler, the Initiator Paste comprising initiator being able to start the hardening of the polyether pre-polymer, filler, diluent, the Base Paste or the Catalyst Paste or the Base Paste and the Catalyst Paste comprising in addition a polyether-modified polydimethyl siloxane of the following formula (I) with R1 being selected from hydrogen or methyl, R2 being selected from H, C1 to C4 alkyl, or acetoxy, n = 1 to 50, x = 1 to 100, y = 1 to 20, the polyether-modified polydimethyl siloxane having a solubility in water of at least 9.1 wt.%. The invention also relates to the use of a polyether-modified polydimethyl siloxane for reducing the stickiness of a dental impression material comprising a cationically curable pre-polymer with a polyether backbone and at least two reactive functional moieties.