To achieve optimum strength and esthetics, a porcelain fused to metal restoration with a porcelain butt joint margin requires a
1. 0.8 - 1.2mm shoulder.
2. sharp, well defined axiogingival line angle.
3. 90- 100 cavosurface margin.
4. finish line that is 2mm subgingival.
(1) and (3)
(2) and (4)
(4) only
All of the above
(1) (2) (3)
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