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Endodontics · single question

Which root of tooth #30 (mandibular right first molar) is MOST likely to have two canals?

  1. Both roots equally
  2. Neither root
  3. Distal root
  4. Mesial root
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Correct answer: D. Mesial root

The mesial root of the mandibular first molar has two canals (MB and ML) in ~80–95% of cases. The distal root usually has one.
  • A. ❌ The roots are not equal; mesial is far more commonly bi-canaled.
  • B. ❌ Both roots frequently have canals.
  • C. ❌ Distal root usually has one canal (two in ~35%).
  • D. ✅ CORRECT – Mesial root has two separate canals in ~80–95% of mandibular first molars.

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