The ANB angle is constructed from which three cephalometric landmarks?

Correct answer: A. Point A, Nasion, Point B

• A. CORRECT. ANB is the angle formed at NASION between the line to POINT A (deepest concavity of the anterior maxilla, between ANS and the alveolar crest) and the line to POINT B (deepest concavity of the anterior mandibular symphysis). It is simply SNA minus SNB, and it expresses the anteroposterior relationship of maxilla to mandible. Normal is roughly 2° ± 2°: greater than about 4–6° indicates a skeletal Class II, and a negative value indicates a skeletal Class III.
• B. Sella–Nasion–Point A is the SNA angle, which locates the MAXILLA relative to the cranial base (normal ≈ 82°).
• C. Menton is the most inferior point of the symphysis and is used for facial height and mandibular plane measurements, not for ANB.
• D. Sella–Nasion–Gonion relates to the mandibular plane and gonial angle, describing vertical growth pattern rather than sagittal jaw relationship.

Note: Memorise the trio: SNA = maxilla to cranial base (≈82°), SNB = mandible to cranial base (≈80°), ANB = maxilla to mandible (≈2°). A large ANB can arise from a protrusive maxilla, a retrusive mandible, or both — always read SNA and SNB before blaming one jaw.