Color Stability of a Microhybrid Resin Composite Polymerized with LED and QTH Light Curing Units

Introduction: Discoloration of resin composites is a common reason for replacement of these restorations. The aim of this study was to eval-uate 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 ac-cording to the CIE (L*a*b*) color scale. ( CIE L*a*b* is a color measurement system with di-mension L for lightness and a and b for the col-or-opponent dimensions). Each subgroup (n=10) were immersed in tea or artificial saliva for 72h at 37°C. The color values of specimens were remeasured and the color change values (ΔE*ab) were calculated using One-Way ANOVA and Tukey test. A P value of <0.05 was consid-ered 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.