الفهرس 
Evaluation of colour stability and surface roughness of three cad/cam materials (ips e.max, vita enamic, and peek) after immersion in two beverage solutions / (an in -vitro study)
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Abstract
Objectives: The present study aims to compare the colour stability and surface roughness of 3 different CAD/CAM materials (IPS e.max, Vita Enamic, and PEEK) after immersion in two beverage solutions (Coffee, Coca-Cola).
Methodology: Samples from a lithium disilicate glass-ceramic (IPS e.max CAD), a hybrid ceramic (Vita Enamic), and PEEK (BioHPP) were evaluated for colour change and surface roughness under immersion in two beverage solutions (Coffee, Coca-Cola). A total of 30 samples were prepared (10 X 10X 1) n=10. Spectrophotometer analysis was used to measure colour parameters (a*, b*, c*) before and after the immersion cycles and the average colour difference (Delta E*) was calculated after immersion in different beverages. Surface roughness was measured with a non-contact profilometer. Statistical analysis was performed using the Kruskal Wallis test with the Mann Whitney test as posthoc. The significance level was set at P ≤ 0.05.
Results: There was a significant colour change between the materials. Vita Enamic and PEEK samples showed the highest colour change value with coffee immersion (ΔE) (7.96± ¬3.86), (6.07± 3.12) respectively. While IPS e.max. CAD revealed the lowest colour change value (2.62 ±1.54) following coffee immersion with a statistically significant difference in between (P<0.011). After immersion in different media, there was a significant difference in surface roughness between the materials (p<0.05).
Conclusion: Vita Enamic and PEEK showed colour change beyond the clinically acceptable level, while IPS e.max CAD was the most stable material in colour and surface roughness.