INBDE (Integrated National Board Dental Examination) Practice Exam

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B/L surfaces are __________ above HOC in primary teeth.

  1. Flatter

  2. Curved

  3. Sharper

  4. Bulbous

The correct answer is: Flatter

In primary teeth, the buccal and lingual (B/L) surfaces are flatter above the height of contour (HOC). This is because primary teeth generally have more bulbous anatomy compared to permanent teeth. The flatter surfaces above the HOC in primary teeth help in maintaining adequate space for the eruption of the permanent successor teeth. On the other hand, if the surfaces were more curved, sharper, or bulbous above the HOC, it could potentially cause crowding or other issues when the permanent teeth begin to come in.

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