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Endodontics · single question

For RCT on tooth #19 (mandibular first molar), how many canals are most commonly found in the MESIAL root?

  1. One canal
  2. Two canals
  3. Three canals
  4. Four canals
Show answer and explanation

Correct answer: B. Two canals

  • A. A single mesial canal is uncommon for a mandibular first molar.
  • B. Correct. The mesial root of the mandibular first molar most commonly has two canals (mesiobuccal and mesiolingual).
  • C. Three mesial canals (middle mesial) occur but are not the most common.
  • D. Four canals in one root is rare.

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