Orthodontics · single question
Which cephalometric measurement decreases in Class III skeletal malocclusion?
Show answer and explanation
Correct answer: B. ANB
ANB angle (A pointu2013Nasionu2013B point) measures sagittal jaw relationship. Normal is ~2u20134u00b0. In Class III, ANB decreases or becomes negative because B point moves anterior to A point, reflecting mandibular prognathia, maxillary retrognathia, or both.