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Evaluation of polymerization in fluoride-containing composite resins
1Department of Dental Materials, College of Dentistry and Medical Research Institute, Pusan National University, Pusan 602-739, Korea.
Journal of Materials Science. Materials in Medicine
|April 18, 2007
Summary
Fluoride composite resins resist caries, with microhardness linked to filler content. Thermocycling did not significantly affect microhardness, but one material showed unique surface degradation.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
Background:
- Fluoride-releasing dental composites are crucial for caries prevention and management.
- Evaluating the physical and chemical properties of these materials is essential for clinical efficacy.
Purpose of the Study:
- To assess the quality of fluoride-containing composite resins.
- To investigate the effects of thermocycling on material properties.
Main Methods:
- Microhardness, polymerization shrinkage, thermal expansion, and surface morphology were tested.
- Thermocycling was employed to simulate oral conditions.
- Filler content (volume percent) was correlated with measured properties.
Main Results:
- Microhardness values were similar between thermocycled and non-thermocycled specimens.
- Surefil exhibited the highest microhardness (68.6 +/- 1.2 Hv).
- A positive linear correlation existed between microhardness and filler content.
- Polymerization shrinkage increased with specimen thickness.
- Tetric Ceram uniquely displayed a "Swiss-cheese" morphology post-thermocycling.
Conclusions:
- Material properties like microhardness are influenced by filler content.
- Thermocycling had minimal impact on microhardness but revealed distinct surface changes in Tetric Ceram.
- Understanding these properties is key to selecting effective fluoride-releasing restorative materials.
