Endodontics · single question
What anatomical feature makes it difficult to restore a maxillary first premolar?
Show answer and explanation
Correct answer: A. Mesial crown and root concavity
- A. Correct. The maxillary first premolar has a distinctive mesial developmental depression (concavity) on the crown and root, plus the mesial marginal ridge groove — this complicates margin placement, matrixing and finishing.
- B. The concavity is on the MESIAL surface, not distal.
- C. The characteristic groove crossing the marginal ridge is on the MESIAL ridge, not distal.
- D. The mesial marginal ridge groove does exist, but the feature that makes RESTORATION difficult is the mesial crown/root concavity.