What is the surface at the base of a Class I cavity preparation called?

The surface at the base of a Class I cavity preparation is referred to as the pulpal floor. This area is significant because it is the bottom of the cavity that rests against the dental pulp, and its preparation must ensure that the underlying pulp is protected while also allowing for proper retention of the restorative material.

When preparing a Class I cavity, which involves decay primarily in the occlusal surface of the posterior teeth, the pulpal floor must be flat and smooth to promote effective bonding of the filling material and to manage any necessary depth to prevent pulp exposure. Understanding the terminology and anatomy of cavity preparations is crucial in dentistry, especially for expanded function dental assistants who assist in the restorative procedures and ensure the correct techniques are employed for optimal outcomes.

The other options provided do not accurately describe the base of a Class I cavity. The wall surface refers to the sides of the cavity preparation, not the base. The base layer typically implies an additional layer of material used in some restorations, rather than the floor of the cavity itself. The cavosurface margin describes the junction where the cavity preparation meets the tooth surface but does not denote the base itself.