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Polymerization shrinkage of composite resins using plasma-arc photocuring
1University of Washington School of Dentistry, Seattle, USA.
General Dentistry
|May 23, 2002
Summary
Plasma-arc light (PAL) curing of composite resins shows similar shrinkage to conventional halogen lights. While PAL offers faster curing, it may reduce the depth of cure for dental materials.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Photopolymerization of composite resins is essential for dental restorations.
- Polymerization shrinkage is an inherent drawback of composite resin photocuring.
- Plasma-arc light (PAL) is a novel photocuring technology offering potential advantages.
Purpose of the Study:
- To compare the linear polymerization shrinkage of a hybrid composite resin.
- To evaluate shrinkage using three different plasma-arc light (PAL) sources.
- To compare PAL curing with a conventional halogen light control.
Main Methods:
- In vitro investigation utilizing a hybrid composite resin.
- Curing was performed using three distinct PAL light sources.
- Linear shrinkage was measured and compared to a halogen light control group.
Main Results:
- No statistically significant difference in linear shrinkage was observed between the three PAL groups.
- No significant difference in resin shrinkage was found when comparing PAL sources to the halogen light control.
- Increased curing intensity with PAL did not correlate with reduced shrinkage in this study.
Conclusions:
- Plasma-arc light (PAL) curing does not significantly alter composite resin shrinkage compared to conventional halogen lights.
- While PAL offers faster curing times, this may potentially compromise the depth of cure.
- Further research is needed to optimize PAL curing parameters for effective dental restorations.
