| Abbreviations | Definitions |
| IFo (incisive fossa) | Most posterior point of the posterior margin of the incisive foramen |
| U1 | Center point of central incisor root |
| U2 | Center point of lateral incisor root |
| U3 | Projected canine cusp point |
| APWP (alveolar process width point) | Point of intersection between the lateral external surface of the upper alveolar bone and the X-axis |
| APLP (alveolar process length point) | Point of intersection between the anterior external surface of the upper alveolar bone and the Y-axis |
| APW | Alveolar process width |
| APL | Alveolar process length |