Bolton Analysis — NDEB AFK MCQ
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Correct answer: B — Tooth-size discrepancy between maxillary and mandibular teeth
The Bolton analysis (Bolton, 1958) compares the mesiodistal crown widths of the maxillary and mandibular teeth to identify tooth-size discrepancies that could prevent ideal occlusal interdigitation. The overall ratio compares the sum of mandibular 12 teeth (6-6) to maxillary 12 teeth (ideal ratio: 91.3%). The anterior ratio compares mandibular 6 anterior teeth (3-3) to maxillary 6 anterior teeth (ideal ratio: 77.2%). Discrepancies >1 SD indicate a Bolton discrepancy that must be addressed in treatment planning (IPR, restorative build-up, or acceptance).
Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019