Volume 2, Issue 4 (12-2013)                   3dj 2013, 2(4): 7-14 | Back to browse issues page


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Razavi S, Esmaeili B, Amiri H, Pakdaman M, Bijani A. Color Stability of a Microhybrid Resin Composite Polymerized with LED and QTH Light Curing Units. 3dj. 2013; 2 (4) :7-14
URL: http://3dj.gums.ac.ir/article-1-70-en.html
1- Assistant Professor Dental Materials Research Cen ter, Department of Operative Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol-Iran.
2- General Dentist Babol-Iran
3- General Practitioner Social Determinants of Health Research Center, Babol University of Medical Sciences, Babol-Iran.
Abstract:   (2359 Views)

Introduction: Discoloration of resin composites is a common reason for replacement of these restorations. The aim of this study was to eva-luate the influence of different light curing de-vices on color stability of a microhybrid resin composite.
 Materials and Methods: 80 disc-shaped speci-mens (8 mm in diameter, 2-mm height) were fabricated from filtek Z250 resin composite. Specimens were divided into 4 groups (n=20) and cured with LED (Bluephase C5, Valo) or QTH (Astralis7 with two different light intensity) light curing devices. Baseline color of each specimen was measured with a spectrophotometer according to the CIE (L*a*b*) color scale. ( CIE L*a*b* is a color measurement system with dimension L for lightness and a and b for the color-opponent dimensions). Each subgroup (n=10) were immersed in tea or artificial saliva for 72h at 37°C. The color values of specimens were re-measured and the color change values (ΔE*ab) were calculated using One-Way ANOVA and Tukey test. A P value of <0.05 was considered significant.
Results: In groups immersed in tea, specimens cured with high power mode of Astralis7 (750mW/cm2), showed the statistically signifi-cant lowest color change. There was no statisti-cally significant difference between two types of Light Emitting Diode units.
 Conclusion: Conventional halogen light (QTH) with high power mode showed the maximum color stability in tea.

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Type of Study: Original article | Subject: Radiology
Received: 2014/04/29 | Accepted: 2014/04/29 | Published: 2014/04/29

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