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The Effect Of Irradiation Distance On Microhardness Of Resin Composites Cured With Different Light Curing Units

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Cekic-Nagas et al. - 2010 - The Effect of Irradiation Distance on Microhardnes.pdf (234.8Kb)
Date
2010
Author
Cekic-Nagas, Isil
Egilmez, Ferhan
Ergun, Gulfem
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Abstract
Objectives: The aim of this study was to compare the microhardness of five different resin composites at different irradiation distances (2 mm and 9 mm) by using three light curing units (quartz tungsten halogen, light emitting diodes and plasma arc). Methods: A total of 210 disc-shaped samples (2 mm height and 6 mm diameter) were prepared from different resin composites (Simile, Aelite Aesthetic Enamel, Clearfil AP-X, Grandio caps and Filtek Z250). Photoactivation was performed by using quartz tungsten halogen, light emitting diode and plasma arc curing units at two irradiation distances (2 mm and 9 mm). Then the samples (n=7/per group) were stored dry in dark at 37°C for 24 h. The Vickers hardness test was performed on the resin composite layer with a microhardness tester (Shimadzu HMV). Data were statistically analyzed using nonparametric Kruskal Wallis and Mann-Whitney U tests. Results: Statistical analysis revealed that the resin composite groups, the type of the light curing units and the irradiation distances have significant effects on the microhardness values (P<.05). Conclusions: Light curing unit and irradiation distance are important factors to be considered for obtaining adequate microhardness of different resin composite groups.
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https://doi.org/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2948735/
http://hdl.handle.net/11655/19178
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