الفهرس 
Effect of artificial aging on the microleakage of new provisional crown system luted with different cements
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Abstract
The aim of this in - vitro study was to evaluate the effect of artificial aging (storage in artificial saliva and thermocycling) on the microleakage of new CAD / CAM provisional crown system VITA CAD - Temp in comparison with currently used bis - acrylic Protemp 4 luted with different non eugenol provisional cements. Forty freshly extracted intact human lower first molars with completely formed roots were collected. Each tooth was vertically embedded in an acrylic block. Teeth were machine milled using a lath to achieve a standardized coronal preparation with 1mm shoulder finishing line and 10{u00B0} axial taper with the side wall length 4.5 mm with flat occlusal reduction, A groove was then cut in the occlusal surface along central fissure mesiodistally