الفهرس 
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Abstract
Ceramic,
cement, time and the interaction of the three variables had a statistically significant effect on
mean ∆E. The IPS e.max CAD ceramic material shows more color change with time than the IPS
Empress CAD ceramic material. Dual-cured resin cements (Paracem & RelyX Unicem) show a
higher color change than light-cured resin cement (Filtek Z350). Time had an effect on color
stability; the more the time the more the color change occurs