color stability of a microhybrid resin composite polymerized with led and qth light curing units
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abstract
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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Journal title:
journal of dentomaxillofacil radiology, pathology and surgeryجلد ۲، شماره ۴، صفحات ۷-۱۴
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