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Stability of radicals in cured composite materials
1Vivadent, Research and Development, Schaan, Liechtenstein.
Summary
The half-life of free radicals in dental composites is logarithmically related to temperature. Filler type, amount, and surface treatment also affect radical stability, influencing composite adhesion.
Area of Science:
- Polymer Chemistry
- Dental Materials Science
Background:
- Radical polymerization of dental composites creates a network with residual double bonds and free radicals.
- These radicals decompose logarithmically, with a half-life of 2-5 days at 37°C.
Purpose of the Study:
- To determine the half-life of radicals in light-cured inlay composites at various temperatures.
- To investigate how different fillers and filler concentrations affect radical stability in experimental composites.
Main Methods:
- Measurement of radical half-life in light-cured inlay composites.
- Evaluation of radical stability influenced by filler type, filler fraction, and surface treatment at constant temperatures.
Main Results:
- A significant logarithmic correlation was found between radical half-life and temperature.
- Radical half-life varied based on filler characteristics (type, amount, surface treatment) at consistent temperatures.
Conclusions:
- Radical stability in dental composites is strongly dependent on temperature and filler properties.
- Radical stability is a critical factor for inter-composite adhesion, including luting cement to inlay materials.