Ideal preparation for PFMs is a chamfer margin
If a porcelain labial margin is prescribed, then a shoulder margin preparation is required
Feather-edge margin preparations are indicated for full-cast restorations

Panavia 21 – tin plated
Glass ionomer cement (GC Fuji, GC America)
Zinc Phosphate Polycarboxylate
Resin Ionomer cement (RelyX, 3M ESPE)

If an adjustment is required on the ceramic, use a fine diamond with water and air to keep the crown cool.
To contour the ceramic, polish with a pink rubber wheel and diamond polishing paste (Brasseler, Shofu, Vident).

D2750 Crown Porcelain fused to high noble
D2751 Crown Porcelain fused to non-precious
D2752 Crown Porcelain fused to semi-precious
D6750 Crown Porcelain fused to high noble (bridge units)
D6751 Crown Porcelain fused to non-precious (bridge units)
D6752 Crown Porcelain fused to semi-precious (bridge units).