Table 3.
Summary of cephalometric landmarks and definitions.
| Abbreviation | Definition | |
|---|---|---|
| 1 | SNA (°) | The angle between the lines Sella-Nasion and Nasion-A point |
| 2 | SNB (°) | The angle between the lines Sella-Nasion and Nasion-B point |
| 3 | ANB (°) | The angle between the lines A point-Nasion and Nasion-B point |
| 4 | SN/PP (°) | The angle between the lines Sella-Nasion and Palatal Plane (ANS-PNS) |
| 5 | SN/MP (°) | The angle between the lines Sella-Nasion and Mandibular Plane (Me-Go) |
| 6 | SE (mm) | The distance between Sella and E point |
| 7 | SL (mm) | The distance between Sella and L point |
| 8 | Pg-NB (mm) | The distance between Pogonion and Nasion-B point |
| 9 | Ar-Pg (mm) | The distance between Articulare and Pogonion |
| 10 | A-RL2 (mm) | The distance between A point and Reference Line 2 |
| 11 | B-RL2 (mm) | The distance between B point and Reference Line 2 |
| 12 | A-RL1 (mm) | The distance between A point and Reference Line 1 |
| 13 | ANS-Me/N-Me (%) | The ratio between lower facial height and total facial height |
| 14 | Jarabak Ratio (%) | The ratio between posterior facial height (S-Go) and anterior facial height (N-Me) |
| 15 | Gonial Ratio (%) | The line drawn from Nasion to Gonion divides the gonial angle(ArGo-MeGo) into to two |
| The ratio between the upper and lower angles is the gonial ratio | ||
| 16 | U1/SN (°) | The angle between the Sella-Nasion and the upper incisor axis |
| 17 | IMPA (°) | The angle between the Mandibular Plane (Me-Go) and the lower incisor axis |
| 18 | L1/RL2 (°) | The angle between the lower incisor axis and Reference Line 2 |
| 19 | Interincisal Angle (°) | The angle between the upper incisor axis and the lower incisor axis |
| 20 | SN/OP (°) | The angle between the Sella-Nasion and the Occlusal Plane |
| 21 | L1/NB (mm) | The distance from the lower incisor most buccal point to the Nasion-B point |
| 22 | Overjet (mm) | The distance from the lower incisor to upper incisor tips on the sagital plane |
| 23 | Overbite (mm) | The distance from the lower incisor to upper incisor tips on the vertical plane |
| 24 | U6-RL1 (mm) | The distance from the mesio-buccal cusp tip of upper first molar to Reference Line 1 |
| 25 | U1-RL1 (mm) | The distance from the upper incisor tip to Reference Line 1 |
| 26 | H Angle (°) | The angle between Nasion-B point and soft tissue pogonion - upper lip |
| 27 | Nasolabial Angle (°) | The angle between nose tip - subnasale and subnasale - upper lip |
| 28 | N-A-Pg (°) | The angle between Nasion - A point and A point - pogonion |
| 29 | A-labialis superior (mm) | The distance between A point and upper lip |
| 30 | E line-labialis superior (mm) | The distance between upper lip and E Line (Soft tissue pogonion - nose tip) |
| 31 | E line-labialis inferior (mm) | The distance between lower lip and E Line (Soft tissue pogonion - nose tip) |
| 32 | Labialis superior-RL2 (mm) | The distance between upper lip and Reference Line 2 |
| 33 | Labialis inferior-RL2 (mm) | The distance between lower lip and Reference Line 2 |
| 34 | Lip strength (mm) | The difference between the distance from the most buccal point of upper incisor to upper lip and the distance from A point to soft tissue sulcus superior |