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Abstract Study the effect of using two impression materials of different stiffness with three impression trays of different flexibility on the casting accuracy of cast metal copings . The mandibular right first molar of a typodont model mounted to a semi- adjustable articulator was prepared for a full coverage cast metal coping . Thirty impressions were made with metal dual - arch impression trays , plastic dual - arch impression trays and a custom made acrylic resin impression tray using polyvinyl siloxane and polyther impression materials. |