A preparation for a porcelain fused to metal crown with a porcelain butt joint margin should have a 1. 90 cavosurface margin. 2. subgingival finish line. 3. 1.2mm shoulder. 4. 90 axiogingival angle.
(1) and (3)
(1) (2) (3)
(2) and (4)
(4) only
All of the above.
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