Practice Quiz

ADA NBDE National Board Dental Part II

Category - NBDE II

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Toothbrush abrasions presents as:
  1. Vertical lines
  2. Horizontal notches
  3. Rough smears
  4. Striated horizontal notches
Explanation
Answer: B - Toothbrush abrasions present as horizontal notches on the buccal and cervical portions of posterior teeth. Abrasions are pathologic loss of tooth structure due to repetitive contact with external forces, such as toothbrushes. Exposure of cementum and dentin and gingival recession is common.
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