Question

The pulpal floor of a Class II cavity is cut

perpendicular to the long axis of the tooth EXCEPT
in the
A. maxillary first premolar.
B. maxillary second premolar.
C. mandibular second premolar.
D. mandibular first premolar.

Answer 1

The mandibular first premolar is the exception to the rule that the pulpal floor of a Class II cavity is cut perpendicular to the long axis of the tooth, due to its unique anatomy.

Step-by-step explanation:

The question pertains to the specifics of dental cavity preparation for a Class II cavity, which is concerning the cavity preparation in premolar teeth. In the context of restorative dentistry, it is important to consider the orientation of the pulpal floor relative to the long axis of the tooth when preparing cavities. For most teeth, the pulpal floor is cut perpendicular to the long axis. However, an exception to this rule is seen in the mandibular first premolar. The reason for this exception is the unique internal anatomy and the external contour of the mandibular first premolar, which mandates a different approach during cavity preparation. Other premolars, such as the maxillary first and second premolars, and the mandibular second premolar, follow the standard procedure where the pulpal floor is cut perpendicular to the long axis of the tooth.