A study of reference lines for mandibular plane angles.
Four mandibular plane angles, MP-sella nasion, MP-Frankfort horizontal, MP-articulare nasion, and MP-gnathion occiput, were compared. Highly significant correlations were found among all four. The relation of an extension of the mandibular plane to the posterior inferior outline of the cranium was found to provide a valid indication of mandibular plane angle. Articulare nasion was found to be the reference line most likely to provide a true indication of the mandibular inclination rather than a reflection of a variation in the reference line itself.
Cephalometry↗