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:: Volume 1, Issue 1 (September- 2012) ::
Caspian J Dent Res 2012, 1(1): 32-35 Back to browse issues page
Hardness of composite resin polymerized with different light-curing units
Hengameh Safarcherati *, Homayoun Alaghehmand
,Department of Operative Dentistry, Dental Materials Research Center, Faculty of Dentistry, Babol University of Medical Sciences, Babol-Iran. , hengamehc@yahoo.com
Abstract:   (14797 Views)

Introduction: The degree of polymerization depends on the type of light-curing unit. The aim of this study was to compare the hardness of composite resin cured by LED and Halogen light curing units.

Methods: In this experimental study, 20 cylindrical samples of Tetric Ceram composite were prepared. Half of them were cured with Ultralume 2 LED and the other half with Astralis 7 Halogen light curing unit. In the depths of 0,1,2 and 3 mm from surface, one point in peripheral and one point in central portion were marked ,then the hardness of these points was measured by Vickers test . The data was analyzed by a pvalue less than 0.05 considered as significant.

Results: The mean hardness of samples cured by LED was more than halogen group in different depths and this difference was statistically significant in peripheral points (p=.048) but this was not significant in central points (p=0.644). The mean hardness in both groups had a decreasing trend from surface to the deep parts in central and peripheral parts and this was more in the central parts.

Conclusions: Composites cured by LED light curing unit showed more hardness in similar depths, besides the hardness of composites in central parts is more than the peripheral ones in both groups.

Keywords: Dental composites, LED, hardness, Halogen
Full-Text [PDF 209 kb]   (3972 Downloads)    
Type of Study: Research Paper | Subject: Restorative Dentistry
* Corresponding Author Address: Faculty of Dentistry, Babol University of Medical Sciences, Babol- Iran.
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Safarcherati H, Alaghehmand H. Hardness of composite resin polymerized with different light-curing units. Caspian J Dent Res 2012; 1 (1) :32-35
URL: http://cjdr.ir/article-1-59-en.html

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Volume 1, Issue 1 (September- 2012) Back to browse issues page
مجله تحقیقات دندانپزشکی کاسپین Caspian Journal of Dental Research
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