Which ANB value corresponds to Class I normal occlusion?

Which ANB value corresponds to Class I normal occlusion?

• A. ANB ≤ 0°
• B. ANB = 2°
• C. ANB ≥ 4°
• D. ANB = -2°

Answer: (B)

ANB angle describes how far forward the maxilla sits relative to the mandible, using nasion as a reference point. In Class I normal occlusion this sagittal relationship is balanced, and the ANB angle is about 2 degrees. Larger values (around 4° or more) point to Class II patterns where the maxilla is ahead of the mandible, while values around 0° or negative indicate Class III where the mandible is advanced relative to the maxilla. Note that nasion position and vertical facial growth can influence ANB, so other assessments can help confirm the skeletal relationship. So the value that corresponds to Class I normal occlusion is roughly 2 degrees.

ANB angle describes how far forward the maxilla sits relative to the mandible, using nasion as a reference point. In Class I normal occlusion this sagittal relationship is balanced, and the ANB angle is about 2 degrees. Larger values (around 4° or more) point to Class II patterns where the maxilla is ahead of the mandible, while values around 0° or negative indicate Class III where the mandible is advanced relative to the maxilla. Note that nasion position and vertical facial growth can influence ANB, so other assessments can help confirm the skeletal relationship. So the value that corresponds to Class I normal occlusion is roughly 2 degrees.