Pennsylvania Expanded Function Dental Assistant (EFDA) Board Practice Exam

The walls of a molar cavity preparation are the boundaries that enclose the prepared space. These include the buccal wall toward the cheek, the lingual wall toward the tongue, the mesial wall toward the neighboring tooth in front, the distal wall toward the neighboring tooth behind, and the pulpal floor, which is the bottom surface facing the pulp chamber. This combination describes the standard set of walls used when outlining a molar preparation.

Occlusal or incisal refer to surfaces, not walls, and apical, cervical describe tooth ends rather than walls. Marginal ridge is a tooth feature, not a wall boundary.