Which landmarks define the facial index?

Which landmarks define the facial index?

• A. Of- Gn and Au- Au
• B. N- Gn and Zy- Zy
• C. Tr- Of and Of- Sn
• D. N- Go and Zy- Zy

Answer: (B)

The facial index is a measurement of facial height relative to facial width. The vertical dimension is defined by the distance from the nasion (N) to the gnathion (Gn), which captures the midface-to-chin height. The horizontal dimension is taken across the widest part of the face between the zygions (Zy–Zy), reflecting the facial width at the cheekbone level. These two measurements together create the index that describes how tall the face is in relation to its width. Other landmark pairs don’t represent the standard vertical facial height and horizontal facial width used for this index, so they don’t define the facial index correctly.

The facial index is a measurement of facial height relative to facial width. The vertical dimension is defined by the distance from the nasion (N) to the gnathion (Gn), which captures the midface-to-chin height. The horizontal dimension is taken across the widest part of the face between the zygions (Zy–Zy), reflecting the facial width at the cheekbone level. These two measurements together create the index that describes how tall the face is in relation to its width.

Other landmark pairs don’t represent the standard vertical facial height and horizontal facial width used for this index, so they don’t define the facial index correctly.