Which of the following teeth have the SAME access cavity shape?

Correct answer: C. All except maxillary premolar

• A. The maxillary premolar has an OVAL/elongated access cavity (to account for two canals). The maxillary canine has a single oval/round canal — different shapes.
• B. Maxillary lateral incisor (round/oval) and mandibular premolar (round, sometimes two canals) are similar.
• C. The question asks 'all have the same access cavity EXCEPT the maxillary premolar.' Maxillary canines, lateral incisors, and mandibular premolars all have relatively similar ovoid/round single-canal access cavities. The MAXILLARY PREMOLAR is the exception — it has a distinctly oval/two-canal access cavity oriented buccolingually.
• D. The maxillary canine and maxillary lateral incisor both have single, round/oval canals with similar lingual-access triangular/oval shapes — these ARE the same.