Figure 2.

Surface models were oriented to Frankfort horizontal/Transverse planes using the following reference lines: A) porion – orbitale in the sagittal view, B) transorbitale in the coronal view, and C) Crista Galli – middle of basion in the transverse view. D) Shows a surface models of the mandible depicting the landmarks used to measure the gonial angle. These included the most posterior point in the surface of the condyle, anatomic gonion and lower border of the mandibular symphysis at menton.