الفهرس 
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Abstract
Ceramic laminate veneers show a successful esthetic and functional long-term service for their perfect color match, marginal integrity and mechanical properties. The minimum-thickness, ceramic laminate veneers are a conservative and esthetic alternative to re -establish the form, shape and color of anterior teeth. Mechanical behavior and marginal integrity are the major factors that affect the long-term prognosis of any restorations.
This clinical study was done to evaluate the marginal integrity, fracture resistance and post- operative sensitivity for two different materials VITA ENAMIC and e.max CAD used for the fabrication anterior ceramic laminate veneers.
Twenty ceramic laminate veneers were fabricated for maxillary incisors. The patients were divided into two groups according to the material group 1(control group) fabricated from e.max CAD laminate veneers and group 2(intervention group) fabricated from VITA ENAMIC laminate veneers. Standardized the same preparation with butt joint design and chamfer finish line located supra gingival were performed for all the teeth.
The fabrication of the veneers was performed using Cad\Cam( Vhf S1) 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.
Survival rate in terms of ( fracture, marginal integrity and post-operative sensitivity) for both groups were evaluated according to united states public health services (USPHS) criteria.
Results:
The mean and standard deviation values were calculated for each group in each test. Data were explored for normality using Kolmogorov-Smirnov and Shapiro-Wilk tests, data showed non-parametric (not normal) distribution. The data obtained by evaluating each assessment criteria were statistically analyzed using the Chi-square test. The significance level was set at P ≤ 0.05. Statistical analysis was performed with IBM® SPSS® Statistics Version 20 for Windows.
Marginal adaptation was graded according to USPHS. There was no statistically significant difference between (group I) and (group II) where (p=1) as both groups showed (100%) Alpha in all time periods. Fracture was evaluated according to the same criteria of USPHS and there was no significant differences as both groups scaled Alpha. Post-operative sensitivity were evaluated according to the same criteria of USPHS and we found there was no significant difference as both groups scaled Alpha.
The results for both materials for marginal adaptation , fracture and post-operative sensitivity were Alpha. This indicated that both materials are clinically accepted in using as ceramic laminate veneers.