Root Concavity Maxillary Premolar — NDEB AFK MCQ
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Correct answer: B — Maxillary first premolar
The maxillary first premolar commonly has a mesial concavity (furcation fluting or developmental groove/depression) on the root surface, especially when two roots are present. This concavity is often deep (0.5-1.0 mm), creating a challenging area for periodontal instrumentation (difficult to access with curettes) and predisposing to localised attachment loss and furcation involvement. Similar root concavities are found on the mesial surfaces of mandibular first molars and the distal surfaces of mandibular second premolars.
Reference: Newman – Newman and Carranza's Clinical Periodontology, 13th ed., 2019