: the angle formed by the junction of the posterior and lower borders of the human lower jaw. — called also angle of the jaw, angle of the mandible.

How do you find the Gonial angle?

The gonial angle is measured by taking the tangent to the posterior border of the ramus and tangent to the lower border of the mandible on lateral cephalogram. Because of the superimpositions seen on lateral cephalograms, reliable measurement of the gonial angle becomes difficult.

What is Gonial angle in orthodontics?

The gonial angle is widely used in orthodontic cephalogram tracing. This angle is the angle between an imaginary tangential line along the inferior border of the mandible and along the posterior border of the mandibular ramus [1. N.