جلد 2، شماره 4 - ( 9-1392 )                   جلد 2 شماره 4 صفحات 7-14 | برگشت به فهرست نسخه ها


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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-fa.html
Color Stability of a Microhybrid Resin Composite Polymerized with LED and QTH Light Curing Units. مجله انگلیسی زبان دانشکده دندانپزشکی گیلان. 1392; 2 (4) :7-14

URL: http://3dj.gums.ac.ir/article-1-70-fa.html


چکیده:   (2248 مشاهده)

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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نوع مطالعه: پژوهشي | موضوع مقاله: تخصصي
دریافت: ۱۳۹۳/۲/۹ | پذیرش: ۱۳۹۳/۲/۹ | انتشار: ۱۳۹۳/۲/۹

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