Endodontics · single question
The ideal access cavity preparation for a mandibular SECOND molar is characterized by which shape?
Show answer and explanation
Correct answer: C. Trapezoidal
Mandibular second molar access = TRAPEZOIDAL — wider mesiodistally, narrower buccolingually, reflecting the arrangement of 2 mesial canals (MB/ML) and distal canals. Trapezoidal shape provides access to all orifices while conserving tooth structure.
- A. Rhomboidal — used for mandibular FIRST molars (4 canals in rhomboid arrangement).
- B. Oval — used for maxillary incisors and canines.
- C. CORRECT. Trapezoidal = mandibular second molar access. Wider mesially, reflecting the 2+1 canal configuration.
- D. Triangular — used for mandibular first premolars and maxillary premolars.