they occur frequently enough to encourage microleakage around the restoration, predisposing to a recurrence of decay. These measurements can also lead to fracture of marginal tooth structure and even to splitting of lateral walls. To solve these problems, flatten the pulpal end of the cavity preparation. (However if accomplishing this at a deep location incurs increased risk of involving the pulp chamber, pulp horns, or recessional lines containing remnants of pulp tissues) make the pulpal floor at more than one level (B) one level will be the ideal depth level (1.5mm) and the others will be the caries cone level dictated by the pulpal extent of the decay. The shallow level creates the flat portion of the pulpal floor at definite angles to the surrounding walls, adequately resisting occlusal forces and laterally locking the restoration, without impinging on pulp tissues. The
first
level
should
be
as
pronounced
and
circumferentially continuous as possible. At least it should exist at two opposing locations in the cavity preparation in order to fulfill its objectives. This level is sometimes called
14