Class 2 cavity preparation - Primary molars
•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