J Adv Prosthodont.  2012 May;4(2):93-96.

Comparison of light transmittance in different thicknesses of zirconia under various light curing units

• Cekic-Nagas I
• Egilmez F
• Ergun G

Abstract

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 (alpha=.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.

Keyword

Zirconia; Light curing unit; Light transmittance

MeSH Terms

Light
Plasma
Polymerization
Polymers
Tungsten
Zirconium
Polymers
Tungsten
Zirconium

Figure

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  Fig. 1 Mean light transmittance (%) of the zirconia specimens in different thicknesses with different light curing units.

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