How much of the tooth to be ground for a crown depends on what kind of crown is being made and is also related to the size of the remaining tooth, metal is ground less, and the tooth is of a lower height requiring intra-root cementation.
Cast metal full crowns are generally 1mm maxillofacially and 0.5mm cervically on the shoulder table; porcelain fused to metal full crowns are cut off 1.5 to 2.0mm anteriorly, 1.0mm labially and buccally on the shoulder table, 0.5mm lingually, and 1.5 to 2.0mm posteriorly in preparation, 1.0mm labially and buccally, and 0.5mm lingually.
All-ceramic crowns were cut off 1.5 to 2.0 mm anteriorly, 0.8 to 1.0 mm axially, 1.0 mm or so on the shoulder table, and 0.5 to 1.0 mm maxillofacially on the three-quarter crowns, with a groove depth and width of 1 mm.
All crown preparations had a polymerization angle of 2 to 5 degrees.