Comparison of light transmittance in different thicknesses of zirconia under various light curing units
Isil Cekic-Nagas1, Ferhan Egilmez, Gulfem Ergun
1Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Purpose:
The objective of this study was to compare the light transmittance of zirconia in different thicknesses using various light curing units.
Materials And Methods:
A total of 21 disc-shaped zirconia specimens (5 mm in diameter) in different thicknesses (0.3, 0.5 and 0.8 mm) were prepared. The light transmittance of the specimens under three different light-curing units (quartz tungsten halogen, light-emitting diodes and plasma arc) was compared by using a hand-held radiometer. Statistical significance was determined using two-way ANOVA (α=.05).
Results:
ANOVA revealed that thickness of zirconia and light curing unit had significant effects on light transmittance (P<.001).
Conclusion:
Greater thickness of zirconia results in lower light transmittance. Light-emitting diodes light-curing units might be considered as effective as Plasma arc light-curing units or more effective than Quartz-tungsten-halogen light-curing units for polymerization of the resin-based materials.
