Table 2.
Description of skeleto-dentoalveolar parameters related to retraction of teeth.
| Legend | Cephalometric parameters | Description |
|---|---|---|
| A | SNA | SN to NA angle |
| B | SNB | SN to NB angle |
| C | ANB | NA to NB angle |
| D | UI x LI | Angle between long axis of upper incisor and lower incisor |
| E | UI x NA | Upper incisor long axis to NA angle |
| F | UI - NA | Distance between most anterior point of crown of upper incisor and NA line |
| G | LI x NB | Lower incisor long axis to NB angle |
| H | LI - NB | Distance between most anterior point of crown of lower incisor and NB line |
| I | IMPA | Angle between the long axis of the mandibular incisor and Mandibular plane |
| J | FMA | Frankfurt mandibular plane angle |
| K | Saddle angle | Angle between SN plane and line joining S and Ar |
| L | Articulare angle | Angle between line joining S and Ar, and line joining Ar and Go |
| M | Gonial angle | Angle between Ar-Go plane and Go-Me plane |
| N | Total Bjork angle | Sum of saddle, articular and gonial angles |