Table 1 Definitions of cephalometric measurements
Measurement | Definition |
|---|---|
SNA (°) | Angle between SN plane and NA plane |
SNB (°) | Angle between SN plane and NB plane |
ANB (°) | Difference between SNA and SNB |
FMA (°) | Angle between FP plane and Go(L)-Me plane |
FMIA (°) | Angle between FH plane and line of L1edge-L1r |
IMPA (°) | Angle between mandibular plane and line of L1edge-L1r |
FH to U1 (°) | Angle between FH plane and line of Uedge-U1r |
NA to U1 (mm) | Linear distance from NA plane to U1s |
NB to L1 (mm) | Linear distance from NB plane to L1s |
Z-angle (°) | Angle between FH plane and profile line |
U1 edge to PP (mm) | Linear distance from U1edge to palatal plane |
L1 edge to MP (mm) | Linear distance from L1edge to mandibular plane |
FH to Occ. P (°) | Angle of FH plane and occlusal plane |