Endodontics · single question
Which tooth most presents challenges during endodontic treatment?
Show answer and explanation
Correct answer: B. Maxillary first premolar
The maxillary first premolar is the most challenging tooth in endodontics for several reasons: it has 2 roots/canals in 60-90% of cases, the buccal root has a mesial concavity ('S' curve on the buccal root), the canal system is often bifurcated at mid-root level making access and obturation difficult, and the root trunk is short. The mesial surface of the maxillary first premolar's buccal root is notoriously difficult to negotiate.
- A. INCORRECT. The mandibular second molar can have fused roots or C-shaped canal systems (in Asian populations) but is not globally considered the most challenging.
- B. CORRECT. The maxillary first premolar presents the most endodontic challenges: bifurcated root system, mesial concavity of buccal root, complex mid-root anatomy, and difficulty maintaining straight-line access to both canals. The mesial surface of the root provides the most access difficulty.
- C. INCORRECT. The maxillary first molar has complex anatomy (MB root with MB1 and MB2 canals) but is generally more accessible with a wider pulp chamber.
- D. INCORRECT. The mandibular second premolar is generally a single-rooted tooth — while it can have complex canal morphology, it is not as consistently challenging as the maxillary first premolar.