الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
Aim : This study was designed to evalute the marginal integrity of bonded cerasmart laminate veneers after exposure to commonly consumed beverages(saliva ,coffee, and orange juice ) for 24 days.
Materials and Methods : A total of thirty nine freshly extracted human upper anterior teeth (centrals) were collected. Teeth were mounted in epoxy resin blocks using a custom-made cylindrical holder. The teeth were prepared with butt-joint veneer preparation design. A CAD/CAM system (Cerec premium 4.4 software) was used for the fabrication of all veneers . All samples (39 samples) were divided into to three test groups according to storage media for 24 hours as follows: group A):(13 Samples) stored in artificial saliva . group (B): (13 samples) stored in coffee . group (c): (13samples) stored in carbonated orange juice for . Each sample was photographed using USB Digital microscope with a built-in camera using a fixed magnification of 45X. A digital image analysis system was used to measure and qualitatively evaluate the gap width. Measurements were reported before bonding and immersion, after bonding and before immersion and after bonding and immersion.
Results : The lowest marginal gap mean value recorded after bonding stage and this was statistically significant as indicated by two-way ANOVA test (P=<0.0001< 0.05). the highest mean marginal gap values were recorded with saliva bonded and immersed group and this was statistically non-significant as indicated by two-way ANOVA test (P=0.3020 > 0.05).The highest mean marginal gap values were recorded with saliva bonded and immersed group followed by coffee bonded and immersed group while the lowest marginal gap mean value recorded with orange bonded and immersed group and this was statistically non-significant as indicated by two-way ANOVA test (P=0.3020 > 0.05).
Conclusion : CERASMART is a promising material in terms of vertical marginal gap in the esthetic region. Marginal integrity of CERASMART veneers was not affected by coffee and carbonated orange juice which have various pH media.