الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
 |  | from | 98 |  |  |
| | | from | 98 | | |
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 affectthe long-term prognosis of any restorations. This clinical study was done to evaluate the marginal integrity and post- operative sensitivity for e.max CAD veneers bonded with delayed (DDS) and immediate bonding (IDS) techniques. Twenty ceramic laminate veneers were fabricated for maxillary incisors. The patients were divided into two groups according to the bonding technique group 1 (control group) e.max CAD laminate veneers bonded with delayed dentin sealing technique. group 2 (intervention group) e.max CAD laminate veneers bonded with immediate dentin sealing technique. 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 (marginal adaptation 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 70
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. Retained or De-bonding was evaluated according to the same criteria of USPHS and there was no significant differences as both groups scaled Alpha. Post-operative sensitivity was 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 bonding techniques for marginal adaptation and post-operative sensitivity were Alpha. This indicated that both techniques are clinically accepted in using for bonding of ceramic laminate veneers.