Start practicing

Endodontics · single question

Which anatomical landmark is used to locate the apex of the mesiobuccal root of the maxillary first molar?

  1. Mesiolingual cusp tip
  2. Central groove
  3. Mesiobuccal cusp tip
  4. Buccal developmental groove
Show answer and explanation

Correct answer: C. Mesiobuccal cusp tip

The mesiobuccal cusp tip is the external anatomical reference for locating the mesiobuccal root apex during access and working length films for the maxillary first molar. Source confirms: 'C) mesiobuccal cusp tip.'
  • A. Mesiolingual cusp tip corresponds to the palatal root — not the mesiobuccal root.
  • B. Central groove is an occlusal landmark — not used to locate the MB root apex.
  • C. CORRECT. Mesiobuccal cusp tip = anatomical reference for MB root apex of maxillary first molar.
  • D. Buccal developmental groove separates MB and DB cusps — not the apex locator landmark.

Practice Endodontics questions Endodontics study notes

More Endodontics practice questions