الفهرس 
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Abstract
Statement of problem : Low limits of fracture resistance of feldspathic porcelain laminate veneers and the need for other substitutions that can withstand more mechanical forces. Aim : The aim of this study was to examine the role of different ultra-translucent monolithic zirconia on marginal gap and fracture resistance values for laminate veneers. Materials and methods : Thirty prepared fiber reinforced resin abutments were milled and used in this study. Thirty laminate veneers were milled from different ultra-translucent monolithic zirconia blanks [group D (DDcubeX2), group P (Prettau Anterior) and group K (KATANA UTML)] and divided into 3 groups (n=10) then sintered and finished. All the veneers were sandblasted, treated by ceramic primer and cemented to the abutments. All specimens were suspected for evaluation of marginal adaptation using stereo-microscope and fracture resistance was assessed using Universal testing machine.Results : Statistical difference was found in marginal gap values between group D and the other groups (group P and group K). Statistical mean load difference was found between group D and the other groups (group P and group K). Conclusion : The tested translucent zirconia could be used clinically as laminate veneer restorations. Marginal adaptation of the tested translucent zirconia is within the accepted clinical range with. DDcubeX2 laminate veneers showed the superior results.