الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 133 |  |  |
| | | from | 133 | | |
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.