الفهرس 
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Abstract
This study investigated the effect of impression technique either single step or double step on the dimensional accuracy of working casts produced using two different impression materials (Vinyl polysiloxane and Polyether).the study included the effect of pouring time and re-pouring on dimensional accuracy of the working casts.
In the present investigation an epoxy resin cast was constructed for impression making of the casts for dimensional accuracy testing .rigid custom impression trays were used as to minimize the deformation of the impression materials and the forces applied while seating and removing the tray from the cast.