Table 1 Definition of landmarks
From: Correlation of social smile symmetry with facial symmetry
Landmarks | Definition |
|---|---|
A (Horizontal line) | A line connecting the right and left pupils |
B (Vertical line) | A line passing from Na, which is perpendicular to “a” line |
Pu (Pupil) | Eye pupil |
Na (soft tissue nasion) | Deepest point of the nasal bridge |
Sn (sub nasale | Midpoint of columella angle |
Pog (soft tissue pogonion) | The most prominent mid-point of the chin |
La (Lateral angel of the eye) | Lateral angle of the eye |
Nt (Tip of the nose) | Most prominent point at the nasal tip |
Oc (Oral commissure) | A point in labial commissure |
An (Ala of nose) | The most lateral point in nasal alar contour |
Gn (Gonion) | The most lateral point in the angle of mandible |
Ph (Philtrum of lip) | Vertical groove at the mid-point of upper lip |
Mt (Midline teeth) | A hypothetical line passing through the dental midline |