Frankfort-mandibular incisor angle
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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. Synonym(s): Frankfort-mandibular incisor angle