CEJ Anatomical Variations — NDEB AFK MCQ
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Correct answer: E — Three patterns: cementum overlaps enamel (~60%), cementum and enamel meet edge-to-edge (~30%), or a gap exists between cementum and enamel exposing dentin (~10%)
The CEJ has three anatomical variations: (1) Cementum overlaps enamel (~60% of cases) — most common; (2) Edge-to-edge meeting (~30%); (3) Gap between cementum and enamel exposing root dentin (~10%) — predisposing to cervical sensitivity and root caries. The gap variation is clinically significant because exposed dentin at the CEJ is susceptible to abrasion, erosion, and caries, and may cause hypersensitivity after gingival recession.
Reference: Nanci – Ten Cate's Oral Histology, 9th ed., 2017