الفهرس 
Effect of Surface Finish and Acidic pH Media on the Surface Roughness and the Color Stability of Vita Suprinity (An In-Vitro Study)
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Abstract
The aim of this study is to determine the effect of surface finish and the effect of different pH media on the color stability and surface roughness of vita suprinity. 76 plates of 3mm thickness were cut by an isomet cutting machine. All the specimens were sintered and then auto-glazed according to manufacturer’s instructions. Half of the specimens was finished using a coarse grit diamond stone and then polished using the special polishing kit for vita suprinity. The specimens were washed using distilled water in an ultrasonic cleaner. The other half was left with its glazed surface without any surface treatment. The samples were stored in 2% citric acid solution and artificial saliva as a control for 8 hours and 14 days respectively in an incubator at 37oC where the saliva was changed every 2 days. Color stability and surface roughness were measured before and after storage where the color stability was measured by using spectrophotometer and the surface roughness was measured by stylus profilometer. Color and surface roughness measurements were recorded at different intervals: Before aging of the samples in solutions (baseline data). After immersion of the samples. It was found that: Regardless to storage media, polished group recorded significantly higher mean value of color changes than Glazed group. The shade was measured by spectrophotometer using the equation {u2206}E= [{u2206}L*]²+[{u2206}a*]²+[{u2206}b*]² {u00BD}