Table 3 Measurement indexes and annotations of upper and lower anterior teeth
Metric | Notes |
|---|---|
U1-SN(°) | The inferior inner angle where the long axis of the upper central incisor (UI-UIA) intersects the SN plane |
U1-NA(°) | The angle between the long axis of the upper central incisor (UI-UIA) and the line connecting the NA |
U1-NA distance (mm) | The vertical distance from UI to NA |
U1-L1(°) | UI and UIA are connected, LI and LIA are connected; the back angle of the intersection of the two lines |
L1-MP(°) | Upper medial angle where the long axis of the lower central incisor (LI-LIA) intersects the mandibular plane MP |
L1-NB(°) | The angle between the long axis of the lower central incisor (LI-LIA) and the line connecting the NB |
L1-NB distance(mm) | Vertical distance from LI to NB connection |