Indications: Single-unit posterior crowns, 3-unit to full-arch bridges, inlay bridges, wing-type bridges, and cantilever bridges. Not recommended for anteriors where esthetics are required. Preparation: Shoulder Preparation. Conservative preparation is acceptable. Minimum occlusal reduction of 0.5 mm; 1 mm is ideal. For Anterior a minimum occlusal reduction of 0.8 mm; 1.25 mm is ideal.