Shade Matching of CAD/CAM Lithium Silicate Ceramics Veneered on Newly Introduced Foundation Material.

Statement of the problem: The emergence Polyetheretherketone (PEEK) in prosthodontics and its use as a foundation for ceramic veenering restorations demand reassessment shade match final restoration. Purpose: This study aimed to investigate different materials on color output two CAD/CAM lithium silicate ceramics. Material Methods: Rectangular plate specimens (60 sample) were prepared from CAD/ CAM generated all-ceramic A2; IPS e.max (EM) CAD Vita suprinity blocks (ZLS). A reflectance spectrophotometer used measure colour difference samples before after bonding specimens; Zirconia (ZR), resin composite (RC), PEEK; all A2. parameter measured via CIE L*a*b* (Commission Internationale de L’Eclairage) system. Statistical analysis data done using way ANOVA Tukey HSD test (α=0.05). Results:ANOVA revealed that ΔE values influenced significantly (P<.05) by composition material used. However; interaction was almost not statistically significant between variables (p=.294). In comparison ZR RC assemblies, material; PEEK, comparable parameters when assembled with each tested veneering material. Conclusions: reinforcement / glass-ceramics decrease impact variations various level acceptance varies tested. Compared other widely (ZR RC); PEEK displayed no tendencies properties.