• Complete class 1 using #330 bur
• Extend occlusal outline to marginal ridge
• Switch to #245 Bur - 3 mm length
• Sweep bur buccolingually in a pendulum motion
and in a gingival direction.
• Break contacts and check with explorer
• Axial wall should follow external contour
• Width of isthmus 1/2 of occlusal table
• Proximal box widest at gingival margin
• Rounded axiopulpal line angle
• No bevel at the gingival margins