What ANB angle value is typically associated with normal Class I occlusion?

What ANB angle value is typically associated with normal Class I occlusion?

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

Answer: (B)

The ANB angle tracks how far forward the maxilla is relative to the mandible, using nasion as the reference point. In a normal Class I relationship, the maxilla and mandible are in balanced sagittal positions, which shows up as a small positive ANB angle—about 2 degrees. That gentle forward offset of point A relative to point B, as viewed from nasion, reflects a harmonious AP jaw relationship without a pronounced discrepancy between the jaws. Values around 0 degrees would suggest the two jaws are more in line in the sagittal plane, which isn’t the typical presentation for a standard Class I occlusion. A larger angle, usually 4 degrees or more, points to skeletal Class II (the maxilla sits ahead of the mandible). A negative angle indicates skeletal Class III (the mandible sits ahead of the maxilla). Keep in mind ANB can be influenced by nasion position and vertical growth patterns, so clinicians may corroborate with other measurements if needed.

The ANB angle tracks how far forward the maxilla is relative to the mandible, using nasion as the reference point. In a normal Class I relationship, the maxilla and mandible are in balanced sagittal positions, which shows up as a small positive ANB angle—about 2 degrees. That gentle forward offset of point A relative to point B, as viewed from nasion, reflects a harmonious AP jaw relationship without a pronounced discrepancy between the jaws.

Values around 0 degrees would suggest the two jaws are more in line in the sagittal plane, which isn’t the typical presentation for a standard Class I occlusion. A larger angle, usually 4 degrees or more, points to skeletal Class II (the maxilla sits ahead of the mandible). A negative angle indicates skeletal Class III (the mandible sits ahead of the maxilla). Keep in mind ANB can be influenced by nasion position and vertical growth patterns, so clinicians may corroborate with other measurements if needed.