Photocurable Dental Impression Material with Adjustable Working Time
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Solution Overview
Problem
Conventional dental impression materials have limited working and setting times, require strict moisture control, and lack tear resistance, making them impractical for use without immediate mixing and application, which complicates their storage and application in dental procedures.
Innovation Solution
A photocurable dental impression material composed of a mixture of polymerizable silicone compounds with dynamic viscosity between 1 to 100 Pas, combined with a filler and a photo initiator system, allowing for a single-component composition that can be stored and applied without mixing, cured with light in the range of 200 to 800 nm, providing adjustable working and setting times, high tear resistance, and excellent detail reproduction and dimensional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dental impression materials are used, then good detail reproduction and dimensional stability are achieved, but the materials require strict moisture control and have poor tear resistance
Solution Approach 1:
The patent combines polyether polymerizable compounds with silicone compounds to create a composite dental impression material. This composite formulation integrates the hydrophilic properties and detail reproduction capabilities of polyether with the hydrophobic properties and tear resistance of silicone, thereby resolving the contradiction between good detail reproduction and poor tear resistance while reducing moisture control requirements
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating specific ratios of polyether polymerizable compounds (1-40 wt%) with silicone compounds. This parameter change transforms the material properties to achieve both hydrophilicity for detail reproduction and hydrophobicity for tear resistance, eliminating the need for strict moisture control
2Duration of action of moving object
If conventional dental impression materials are used, then adequate working time is provided, but immediate mixing and application are required which complicates storage and application
Solution Approach 1:
The patent merges multiple components into a single-component photocurable formulation containing polymerizable silicone compounds, polymerizable polyether compounds, and photoinitiators in one container. This eliminates the need for separate mixing of multiple components, thereby reducing device complexity and application steps while maintaining adjustable working time through controlled photopolymerization
Solution Approach 2:
The patent replaces the mechanical mixing system with a photocurable chemical system. Instead of requiring mechanical mixing of multiple components, the material uses photoinitiators that trigger polymerization upon light exposure, substituting mechanical complexity with a simpler optical-chemical activation mechanism that maintains adequate working time
3Reliability
If conventional addition silicone impression materials are used, then good detail reproduction and dimensional stability are achieved, but the materials are inherently hydrophobic requiring moisture control
Solution Approach 1:
The patent applies local quality by incorporating hydrophilic polyether compounds into the hydrophobic silicone matrix, creating regions with different wettability characteristics. This allows the material to exhibit both hydrophobic properties (for tear resistance) and hydrophilic properties (for moisture tolerance and detail reproduction) in different phases of the composite material
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, easy-to-apply dental impression material with adjustable working and setting times, improved tear resistance, and reduced shrinkage, eliminating the need for immediate mixing and moisture control, enhancing the practicality and accuracy of dental impressions.
Implementation Method 1
a photocurable dental impression material comprising: (a) a mixture of polymerizable silicone compounds each having two or more polymerizable (meth)acrylate groups
Data Source
AI summary
A photocurable dental impression material comprising:(a) a mixture of polymerizable silicone compounds each having two or more polymerizable (meth)acrylate groups, said mixture having a dynamic viscosity at 25° C. of from 1 to 100 Pas;(b) a filler;(c) a photo initiator system,wherein the mixture of polymerizable silicone compounds comprises based on the total weight of the mixture of polymerizable silicone compounds(a) 10 to 90 percent by weight of high-molecular polymerizable silicone compounds having a molecular weight in the range of from more than 4000 up to 10.000; and(b) 90 to 10 percent by weight of polymerizable silicone compounds having a molecular weight in the range of from 300 to 4000.