Table 1.
Definition of Skeletal Measurements
| Mandibular plane angle (FH- Gome) | Angle between the Frankfort plane and the mandibular plane |
| Basal angle (Ans Pns- Gome) | Angle between the palatal plane and the mandibular plane |
| Saddle angle (Sn- SAr) | Angle between the anterior cranial base and the posterior cranial base |
| Articular angle (SAr- ArGo) | Angle between the posterior cranial base and the ramal plane |
| Gonial angle (Ar-Go-Me) | Angle between the posterior border of the ramus and the corpus line |
| Sum of Bjork | Sum of Gonial, articular and saddle angles |
| Inclination Angle (Pnline-AnsPns) | Angle between the perpendicular plane and the palatal plane |
| Palatal Plane angle (Sn-Ans Pns) | Angle between the palatal plane and the sella-nasion plane |
| Ramus-FH | Angle between the posterior border of the mandible and the Frankfort horizontal plane |
| Jarabax index | The ratio of the posterior facial height to the anterior facial height |
| Total anterior facial height =TAFH (N-Me) | A linear measurement from the junction of the nasal and frontal bone to the menton |
| Upper anterior facial height=UAFH (N-A) | A linear measurement from the junction of the nasal and frontal bone to the most concave portion of the premaxilla |
| Lower Facial height =LAFH (A-Me) | A linear measurement from the most concave portion of the premaxilla to the menton |
| Lower Facial height/Total Facial height×100 (LAFH/TAFH) | The ratio of the lower facial height to the total anterior facial height |
| Lower Facial height/upper Facial height ×100 (LAFH/UAFH) | The ratio of the lower facial height to the upper facial height |
| Ramus length (Ar-Go) | A linear measurement from the intersection of the posterior of the ramus and the outer margin of the cranial base to the most inferior posterior portion of the angle of the mandible |
| Posterior facial height=PFH(S-Go) | A linear measurement from the midpoint of the sella and the most inferior posterior portion of the angle of the mandible |