الفهرس 
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Abstract
The aim of the present study was to evaluate the color stability and surface roughness of two types of newly introduced hybrid ceramics namely:
1-Lava Ultimate resin nano-ceramic
2-Vita Enamic resin infiltrated hybrid ceramic.
When immersed in different beverages having different pH values, which are:
1-Artificial saliva at pH 7.
2- Coffee at pH 5.
3-Coca Cola at pH 2.7.
PICO Question
P: Consumption of Beverages with different pH values
I: Exposure of Hybrid Ceramics to Beverages with Different pH values
C: Exposure of Hybrid Cermics to Artificial saliva
O: Color stability, and Stability of the surface topography