الفهرس 
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Abstract
The purpose of this in-vitro study was to evaluate the effect of repolishing on color stability of hybrid ceramics after immersion in chlorhexidine mouth rinse using spectrophotometric analysis.Sixty rectangular specimens were cut of (A1)
shade CAD/CAM blocks into 1mm thickness, 14mm length and 14mm width using Isomat4000. Specimens were divided into 3 groups (vita enamic, shofu hc & nacera hybrid). Color was measured by spectrophotometer before immersion in mouth rinse (sub group A: control), after immersion in20ml of Chlorhexidine gluconate (CHX) mouth rinse for 120 hours (sub group B) and after repolishing with diacomp plus diamond polishing discs(sub group C). The data were tabulated and statistically analyzed using ANOVA test.