الفهرس 
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Abstract
This in vitro study was conducted to evaluate the color stability, change in opacity and change in surface roughness of an ORMOCER, and two methacrylate based composites after being immersed in different staining beverages for different time intervals.
A total of one hundred twenty disc specimens (10mm in diameter and 2mm in thickness) were prepared from three composite resins, an Ormocer based (Admira fusion X-tra) and two methacrylate based (X-tra fill) and (Esthet-X HD) composite resins (n = 40) using a split Teflon mold.
Specimens of each type of composite were divided in to four groups according to immersion solutions (n = 10).
group A: Immersed in coffee.
group B: Immersed in tea.
group C: Immersed in cola.
group D: Immersed in distilled water as a control group .
Color evaluation was done at base line before staining and then at periods of 7 days, 14 days, 28 days using spectrophotometer. Change in color (ΔE*) and opacity (Op) were obtained using the CIE L*a*b* system. Surface roughness was evaluated using Atomic Force microscopy at baseline before staining and then at 28 days from immersion in staining beverages .
All composite used showed change in color values at the end of the time intervals after 28 days of immersion in staining solutions. group A (coffee) was the highest effecting group (ΔE >3.3) and Admira fusion X tra was the material with the highest change in color. Surface roughness also increased especially in group C (cola) for all materials after 28 days with no statistically significant difference between groups (p>0.05).