الفهرس 
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Abstract
Aim: The aim of the present study was to evaluate the marginal integrity of two types of ceramics; celtra duo and IPS Emax CAD vonlays restoring maxillary premolars.
Methodology: A natural tooth represent first maxillary premolar was prepared according to regular dimensions of all ceramic restorations preparation guidelines, the prepared natural tooth was then duplicated into twenty epoxy resin dies, each duplicated epoxy die was scanned by 3 shape D500 extra oral scanner and then milled by Sirona MCX5 milling machine using IPS e.max CAD blocks and celtra duo CAD blocks. A total of twenty restorations were constructed, the samples were divided into two equal groups, ten samples for each group according to the material type used, group (I)ten vonlay samples (n=10) fabricated of IPS e.max CAD blocks, group (V) ten vonlays samples (n=10) fabricated of celtra duo CAD blocks. Marginal gap was measured using stereomicroscope.
Result: It was found that Emax CAD vonlays recorded statistically non-significant higher marginal gap mean value (90.64μm ±9.64) than Celtra duo vonlays (88.46μm ±9.92).
Conclusion: Both celtra duo and IPS e.max CAD have marginal integrity within the clinically acceptable range and can be safely used for premolar area.
Keywords: onlay, veneer, vonlay, marginal integrity, marginal gap, E-max cad and celtra duo.