Dental Putty Release Agents Prevent Hydrocarbon Exudation
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Solution Overview
Problem
Dental putty materials based on addition-curing silicones face issues with exudation of hydrocarbons during storage and crosslinking, leading to reduced adhesion and impression quality due to the migration of additives, which disrupt the bonding between the putty mass and low-viscosity correction material, and cause adhesion issues with the impression tray.
Innovation Solution
A two-component putty composition using a combination of paraffin and alkyl-substituted polydimethylsiloxanes as release agents, which prevents sticky properties and exudation throughout the life cycle, allowing for both hand kneading and mechanical mixing, with a formulation that includes polydimethylsiloxanes, fillers, and a catalyst for controlled crosslinking, ensuring stability and precision in dental impressions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydrocarbons are added to reduce stickiness during hand kneading, then ease of operation is improved, but exudation occurs during storage and crosslinking leading to reduced adhesion and impression quality
Solution Approach 1:
The patent changes the chemical parameters of the release agent by using alkyl-substituted polydimethylsiloxanes with specific alkyl chain lengths (8-30 carbon atoms) instead of conventional hydrocarbons. This parameter change allows the material to maintain non-sticky properties during handling while preventing exudation during storage and crosslinking, thus resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The patent creates a composite release agent system by combining alkyl-substituted polydimethylsiloxanes with paraffin in specific ratios (0.5-10% by weight of the siloxane and 1-20% by weight of the paraffin). This composite material provides both the desired handling properties and storage stability, eliminating the exudation problem that occurs with single-component hydrocarbon systems.
2Ease of operation
If paraffin is used as a release agent to prevent sticking, then ease of operation is improved, but exudation and droplet formation occur during storage reducing stability
Solution Approach 1:
The patent introduces alkyl-substituted polydimethylsiloxanes as an intermediary substance that mediates between the paraffin and the silicone base material. The siloxane molecules with their alkyl chains (8-30 carbon atoms) act as a bridge, providing the hydrophobic interaction needed to prevent paraffin exudation while maintaining the non-sticky properties essential for easy mixing and handling.
Solution Approach 2:
The patent optimizes the concentration parameters of both paraffin (1-20% by weight) and alkyl-substituted polydimethylsiloxanes (0.5-10% by weight) to achieve the right balance between non-sticky properties and storage stability. This precise parameter control ensures sufficient non-stickiness for handling while preventing exudation during storage.
3Stability of the object's composition
If the putty mass is made highly viscous for stability, then storage stability is improved, but adhesion to the tray and correction material is reduced
Solution Approach 1:
The patent modifies the rheological parameters of the putty by incorporating specific amounts of release agents (alkyl-substituted polydimethylsiloxanes and paraffin) that alter the surface properties without significantly changing the bulk viscosity. This allows the material to maintain high viscosity for storage stability while improving surface adhesion properties through the amphiphilic nature of the siloxane molecules.
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 solution provides a stable, non-sticky, and dimensionally stable dental impression material with reduced exudation, maintaining adhesion and impression quality, allowing for precise and accurate dental impressions without the formation of droplets on the surface, even after storage.
Implementation Method 1
prevents sticky properties and exudation throughout the life cycle
Implementation Method 2
which prevents sticky properties and exudation throughout the life cycle, allowing for both hand kneading and mechanical mixing
Implementation Method 3
addition-curing silicones. This class of substances, which are cold-crosslinking two-component systems in which two pastes are mixed together and harden together at room temperature
Implementation Method 4
the impression material must be brought into the oral cavity in a plastic state, where it undergoes a phase transformation and changes to a solid-elastic or rigid state
Implementation Method 5
two-component systems in which two pastes are mixed together and harden together at room temperature after a few minutes
Implementation Method 6
addition-curing silicones. This class of substances, which are cold-crosslinking two-component systems
Data Source
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AI summary
The application relates to a storage- and dimensionally stable dental, two-component, elastomeric impression material based on addition-curing silicones, wherein one component comprises a polymerization catalyst containing or consisting of: a.) at least one polydimethylsiloxane comprising polyatomic crosslinkable groups, preferably unsaturated crosslinkable groups; b.) at least one polyalkylsiloxane with Si-H functionalities; c.) at least one catalyst for the reaction of a polydimethylsiloxane comprising polyatomic crosslinkable groups with a polydimethylsiloxane comprising Si-H functionalities; d.) one or more fillers; e.) a combination of release agents comprising: i.) at least one alkyl-substituted polydimethylsiloxane in which the alkyl chain is linear or branched, and/or at least one polydimethylsiloxane in which the alkyl chain is linear or branched and partially or completely halogenated, preferably fluorinated; and ii.) at least one paraffin. Furthermore, the application relates to a dental impression, uses, a dental kit and a manufacturing process, each relating to the dental impression material.