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Radiology · single question

On a lateral cephalometric radiograph, the ANB angle is used to assess what, using which landmarks?

  1. The anteroposterior (sagittal) jaw relationship, using point A (maxilla), point B (mandible), and nasion (N)
  2. Vertical facial height using only point A
  3. Tooth angulation using the occlusal plane
  4. Airway dimension only
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Correct answer: A. The anteroposterior (sagittal) jaw relationship, using point A (maxilla), point B (mandible), and nasion (N)

ANB is the difference between SNA and SNB and describes the sagittal relationship of the maxilla (point A) to the mandible (point B) relative to nasion: a larger ANB suggests Class II, a smaller/negative ANB suggests Class III.Other options: Vertical height, tooth angulation, and airway are assessed with other measurements.Key exam takeaway: ANB (points A, B relative to nasion) = sagittal maxillomandibular relationship; high = Class II, low/negative = Class III.

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