Placed halfway between Pog and Me by eye
The midpoint of the two is close to gnathion on a square chin and several millimeters out on a sloping one.
Point · Gn
Gnathion (Gn)
The most anteroinferior point of the chin — the corner between pogonion and menton.
At Beginner a placement counts as found within 2.2 mm of the reviewed reading.
How to find it
Press a step to be shown it on the ceph.
Common errors
Each figure is the reviewed reading of Gnathion (Gn) and a typical miss, on the same ceph, at the distance the mistake usually goes.
Placed at menton
Where the lower border curves gently there is no visible corner, and the point falls to the lowest place instead of the bisector.
Used in
11 measurements are built on it. Miss it, and every one of them moves.
- Gonial angle (Ar-Go-Gn)
- Gonial angle (Ar-Go-Gn) — Jarabak
- Lower gonial angle (N-Go-Gn)
- FMA — Frankfort-mandibular plane angle
- Mandibular plane angle (Downs)
- Mandibular plane angle (FH ∠ Go–Gn)
- Y-axis (S-Gn to FH)
- Effective mandibular length (Co–Gn)
- Maxillomandibular differential
- Björk's sum of angles
- Mandibular body length (Go–Gn)
Your record
You have not placed this one yet.