Periodontics · single question
Which furcation of the maxillary first molar is closest to the CEJ?
Show answer and explanation
Correct answer: B. Mesial furcation (~3mm from CEJ)
Distance of maxillary first molar furcations from the CEJ: Mesial ≈ 3mm (CLOSEST), Buccal ≈ 4mm, Distal ≈ 5mm (FARTHEST). The mesial furcation's proximity to the CEJ makes it most vulnerable to early periodontal involvement and most challenging to instrument.
- A. ❌ Buccal furcation is approximately 4mm from CEJ — not the closest.
- B. ✅ Mesial furcation is closest (~3mm from CEJ) — most vulnerable to periodontal involvement.
- C. ❌ Distal furcation is approximately 5mm from CEJ — the farthest from the CEJ.
- D. ❌ The three furcations are at different distances from the CEJ.