الفهرس 
Title : One-year clinical evaluation of IPS empress CAD versus polished celtra DUO ceramic laminate veneers :
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Abstract
Aim: To evaluate fracture resistance and survival rate of IPS Empress CAD versus Polished Celtra Duo ceramic laminate veneers.Methodology: Thirty-six ceramic laminate veneers were fabricated for maxillary anterior teeth. The patients were divided into two groups according to the material group 1(control group) fabricated from IPS Empress CAD laminate veneers and group 2(intervention group) fabricated from Polished Celtra Duo laminate veneers. Standardized butt joint preparation design and chamfer finish line located supra gingival were performed for all the teeth. The fabrication of the veneers was performed using Cad\Cam (Ceramill motion) machine, with software (Exocad). The veneers surfaces were treated and silanated according to the manufacture instruction of each ceramic and enamel surfaces were etched where total etch adhesive protocol was obeyed using BISCO. Fracture resistance, marginal adaptation, retention, and sensitivity for both groups were evaluated according to United States public health services (USPHS) criteria Results: Fracture resistance, marginal adaptation, retention, caries and sensitivity were evaluated according to the criteria of USPHS and we found there is no significant difference as both groups scaled zero score. Conclusions: Both IPS Empress Cad and Polished Celtra Duo laminate veneers revealed high successful clinical performance in terms of fracture resistance, marginal adaptation, retention, and sensitivity