1. any of several variously named and variously defined anatomic angles that have been used to quantify facial protrusion;
2. in dentistry, the angle formed by the intersection of the orbitomeatal (Frankfort) plane with the nasion-pogonion line (inner lower angle), which establishes the anteroposterior relation of the mandible to the upper face at the orbitomeatal plane.
Frankfort-mandibular incisor angle
Stedman’s Medical Dictionary © Wolters Kluwer Health. All rights reserved.