Cationic Dental Composition with Fluoropolymer Particles
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Solution Overview
Problem
Dental impression materials based on polyether chemistry often pose challenges in terms of ease of removal from the mouth, hardness, and scannability, with the addition of light-reflective additives affecting color brightness and shelf-life stability.
Innovation Solution
A curable dental composition comprising a cationically hardenable compound with aziridine moieties, a radiation-sensitive starter, polymeric particles with a maximum particle size of 150 μm or below, and optional inorganic filler particles, which enhances scannability and reduces hardness without compromising consistency or shelf-life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polyether impression materials are used for dental impressions, then the material provides good accuracy for determining dental situation, but the cured material becomes too hard and difficult to remove from the patient's mouth
Solution Approach 1:
The patent combines polyether base material with silicone oil as a plasticizer to create a composite material system. The silicone oil modifies the cured polyether network, reducing crosslink density and hardness while preserving the dimensional accuracy and impression quality. This composite approach allows simultaneous achievement of accurate impressions and easy removal.
Solution Approach 2:
The patent modifies the chemical composition parameters of the polyether system by adding silicone oil at controlled concentrations. This changes the physical properties of the cured material, specifically reducing hardness and increasing flexibility, thereby enabling easy removal while maintaining impression accuracy through optimized formulation parameters.
2Difficulty of detecting and measuring
If light-reflective additives are added to enhance scannability, then the material becomes more detectable by scanners, but the color brightness deteriorates and shelf-life stability is compromised
Solution Approach 1:
The patent removes problematic light-reflective additives from the formulation and replaces them with polymeric particles that provide scannability through different mechanisms. This extraction of harmful substances eliminates the negative effects on color brightness and shelf-life while achieving the desired detectability through alternative means.
Solution Approach 2:
The patent uses polymeric particles as a temporary, non-migrating scannability enhancer that does not require long-term stability like traditional additives. These particles provide sufficient reflectivity for scanning purposes without compromising the material's color properties or long-term storage stability.
3Stability of the object's composition
If inorganic filler particles are used to maintain consistency, then the material structure is stabilized, but the hardness increases making removal difficult
Solution Approach 1:
The patent changes the filler particle parameters by using polymeric particles with specific size distributions and mechanical properties instead of traditional inorganic fillers. This substitution maintains compositional stability and consistency while the polymeric nature of the particles provides flexibility that facilitates easy removal from the mouth.
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 allows for easy detection and removal, maintains color brightness, and improves scannability while maintaining the desired consistency and mechanical properties, ensuring effective dental impression and retraction processes.
Implementation Method 1
a radiation-sensitive starter, the radiation sensitive starter comprising an onium salt, a ferrocenium salt, a combination or mixture thereof
Data Source
AI summary
The invention relates to a curable dental composition comprising a cationically hardenable compound (A) comprising at least two aziridine moieties, a starter (B) being suitable to cure the hardenable compound (A), polymeric particles as filler component (C), the polymeric particles having a maximum particle size of 150 μm or below and the component(s) the polymeric particles are made of being based on fluoropolymers comprising more than 99% monomer repeating units of tetra fluoro ethylene. The invention also relates to the use of such composition for producing a dental impression material or a dental retraction material.