What is the ideal occlusal reduction for a full-metal (full gold) crown?

Full-metal crowns require roughly 1.0-1.5 mm of occlusal clearance (about 1.5 mm on functional cusps, 1.0 mm on non-functional), less than porcelain restorations because metal is strong in thin sections.Other options: 0.5 mm is insufficient even for metal; 2 mm approximates all-ceramic/PFM needs; 4 mm is excessive.Key exam takeaway: Occlusal reduction: full metal about 1.0-1.5 mm; PFM/all-ceramic about 1.5-2.0 mm.