color stability of a microhybrid resin composite polymerized with led and qth light curing units

Authors

shaghayegh razavi dental materials research cen ter, department of operative dentistry, faculty of dentistry, babol university of medical sciences, babol-iran.

behnaz esmaeili dental materials research cen ter, department of operative dentistry, faculty of dentistry, babol university of medical sciences, babol-iran.

hoda amiri

mahdiye pakdaman

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 surgery

جلد ۲، شماره ۴، صفحات ۷-۱۴

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