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Endodontics · single question

The root with the highest chance of having 2 canals in the mandibular first molar is:

  1. Mesiobuccal root
  2. Mesial root
  3. Distobuccal root
  4. Distal root
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Correct answer: B. Mesial root

  • A. Mesiobuccal and distobuccal roots are terminology used for maxillary molars, not mandibular molars.
  • B. Correct. The mesial root of the mandibular first molar almost always (>85%) has 2 canals (mesiobuccal and mesiolingual), making it the root with the highest prevalence of 2 canals in this tooth.
  • C. See explanation for C — distobuccal is maxillary molar terminology.
  • D. The distal root of the mandibular first molar most commonly has 1 canal (single large distal canal), though a second distal canal is present in approximately 30–40% of cases.

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