الفهرس 
Materials&MethodsOnly 14 pages are availabe for public view
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Abstract
This study aimed to evaluate three systems used to produce dental crowns,gold electroforming system GES, In-ceram alumina all ceramic system and the conventional metal ceramic system using gold alloy.laboratory evaluation aimed to evaluate the shear bond strength SBS between veneering porcelain and underlying structure through making disc shaped specimens from the core materials and veneering porcelain in the form of rods.The change in colour between intended shade guide and the resulted one, the marginal and internal fit of the tested systems was conducted through making10 crowns of each system .The colour change was evaluated using arecently introduced intraoral spectrophotometer