What is the access cavity shape for the maxillary lateral incisor — and which access cavity shape is the 'ODD ONE OUT' (different from maxillary premolar, canine, and mandibular premolar)?

Correct answer: D. Maxillary lateral incisor is triangular (same as central incisor) — the exception because premolars and canine have different shapes

• A. Maxillary premolar has an oval/ovoid access shape — sharing oval with canine and mandibular premolar.
• B. Maxillary canine has an oval access shape — in the same 'oval' group.
• C. Mandibular premolar has an oval access shape.
• D. Correct. Access cavity shapes: Maxillary canine = oval; Maxillary first premolar = oval/ovoid (may be figure-8 if 2 canals); Mandibular premolars = oval. The MAXILLARY LATERAL INCISOR is triangular — the same shape as the central incisor but DIFFERENT from the oval shapes of canines and premolars. Thus, the lateral incisor is the 'odd one out' when grouped with canine and premolars.