Fig. 2

Occ, MF_V, and MF_H plane. Occ plane, a plane through the bilateral mandibular first molar mesiobuccal cusp and the center of the lower incisal edge; MF_V plane, a plane through the MF point and parallel to the Occ plane; MF_H plane, a plane through the bilateral MF point and perpendicular to the Occ plane