Dental Composite Resin Storage Stability via Segmented Fluorescent Fillers
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Solution Overview
Problem
The polymerization activity of dental composite resins containing a photopolymerization initiator comprising an α-diketone compound, a photoacid generating agent, and an aromatic amine compound decreases significantly during storage, especially at high temperatures, due to the reaction between the phthalate ester fluorescent agent and the photoacid generating agent, leading to reduced commercial value.
Innovation Solution
Incorporating a phthalate ester fluorescent agent into an organic filler within the photopolymerizable composition, which traps the fluorescent agent and prevents degradation of the photoacid generating agent, thereby maintaining high polymerization activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a phthalate ester fluorescent agent is compounded in a dental composite resin, then the aesthetic appearance and fluorescence similar to natural teeth is achieved, but the polymerization activity of the photopolymerization initiator decreases significantly during storage
Solution Approach 1:
The fluorescent agent is segregated from the main resin matrix and embedded within discrete filler particles. This segmentation prevents direct contact and reaction between the fluorescent agent and the photopolymerization initiator, thereby maintaining polymerization activity while preserving aesthetic appearance.
Solution Approach 2:
The filler particle acts as an intermediary barrier between the fluorescent agent and the photopolymerization initiator. By placing the fluorescent agent inside the filler particle, the filler serves as a protective medium that prevents harmful interactions while allowing the fluorescent agent to remain functional.
2Duration of action of stationary object
If the dental composite resin is stored at high temperatures, then the storage stability is tested, but the polymerization activity decreases due to reaction between fluorescent agent and photoacid generating agent
Solution Approach 1:
The fluorescent agent is segmented and isolated within filler particles, preventing thermal acceleration of reactions between the fluorescent agent and photopolymerization initiator during storage, thereby maintaining polymerization activity even at elevated temperatures.
Solution Approach 2:
The filler particle, which would normally just be a passive component, is converted into an active protective element that benefits the system by preventing degradation reactions, especially under thermal stress conditions.
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 photopolymerizable composition remains stable and retains high polymerization activity even after long-term storage, particularly at elevated temperatures, ensuring consistent performance as a dental restorative material.
Implementation Method 1
a photopolymerization initiator comprising (B1) an α-diketone compound, (B2) a photoacid generating agent, and (B3) an aromatic amine compound
Implementation Method 2
a phthalate ester fluorescent agent
Data Source
AI summary
Disclosed are photopolymerizable compositions suitable for uses such as dental composite resins, and that comprise (A) a radical-polymerizable monomer, (B) a photopolymerization initiator that comprises (B1) an α-diketone compound, (B2) a photoacid generating agent, (B3) an aromatic amine compound, and (C) an organic filler containing a phthalate ester fluorescent agent.