Sherif Z. Hassan, Enas Fathelbab And Mohammed M. Shalaby,

ABSTRACT

Objectives: The Aim Of This Study Was To Determine The Effect Of Different Hybrid Ceramics Thicknesses And Different Luting Agent Shades On The Perceived Final Color Of The Restoration. Methods: Forty Disc Shaped Samples (0.5 & 1mm Thick) Were Fabricated From Vita Enamic Shade (3M2-HT) And Lava Ultimate Shade (A3-HT) Hybrid Ceramics (20 Sample Each). Resin Composite Discs (10 Mm Diameter & 2 Mm In Thickness) Shade A4 Was Used To Simulate The Color Of A Dark Underlying Substrate (n=40). Cementation Of Discs Was Carried Out With Rely X Veneer Shade A3 Opaque, Translucent Or Without Cement (control Group). Color Differences (?E) Were Determined Using Spectrophotometer. For Parametric Data; Three-way (ANOVA) Was Used To Analyze The Data, Followed By Bonferroni�s Post-hoc. The Significance Level Was Set At P ? 0.05.

Results: The L* A* B* Values Of The Tested Materials Were Affected By Both Luting Agent And The Ceramic Thickness. The Mean Values Of (?E) For 0.5 Mm Thick Samples Were Higher Than Those Of 1 Mm Thick. The Mean Values Of (?E) For Opaque Luting Agent Samples Were Higher Than Those Of Luted With Translucent Luting Agent. Decrease In Mean Values Of (?L) Of All The Tested Samples Was Detected. Conclusion: Both Tested Materials Luted With Translucent Luting Agent Recorded Clinically Acceptable Color When Used In 1mm Thickness. The Tested Luting Agent Shades Made The Final Color Of The Samples Darker Than The Control Group.