Radiology · single question

A cephalometric analysis shows an ANB angle of 6 degrees. What skeletal classification does this represent?

  1. Class I
  2. Class II
  3. Class III
  4. Open bite
Show answer and explanation

Correct answer: B. Class II

The ANB angle reflects the relative position of the maxilla (A-point) and mandible (B-point) to the cranial base. Class I: ANB = 2–4 degrees (normal skeletal relationship). Class II: ANB > 4 degrees (maxillary protrusion or mandibular retrusion). Class III: ANB < 2 degrees (mandibular protrusion or maxillary retrusion). An ANB of 6 degrees indicates a Class II skeletal pattern, often associated with retrognathic mandible or prognathic maxilla.

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