Lips measurement
Mentolabial Angle
Angle of the fold between the lower lip and the chin. Acute values mean a deep labiomental fold; obtuse values a shallow, flat transition from lip to chin.
At a glance
- Ideal
- 110–130°
- Unit
- degrees
- Weight in the overall score
- 4.5
- Area
- Lips
How it is measured
∠ Li–Sl–Pog
- Li Labrale inferius (lower lip) — The most forward point of the lower lip.
- Sl Sublabiale — The deepest point of the fold between the lower lip and the chin.
- Pog Pogonion — The most forward point of the chin.
Ideal range and tiers
Each value falls into a tier (T1 = ideal). Comfortably inside T1 the rating is 10, easing to 9.5 at the edges of the ideal range; beyond it the rating falls with the deviation — fastest in the first tiers outside the ideal — down to −10 (below 0 where the original tier sheet takes points away) at the far end of the worst tier.
| Tier | Range | Rating |
|---|---|---|
| T1 Ideal | 110–130° | 9.5–10 |
| T2 Near ideal | 105–110° or 130–135° | 7.2–9.5 |
| T3 Mild deviation | 100–105° or 135–140° | 5.2–7.2 |
| T4 Moderate deviation | 95–100° or 140–145° | 3.4–5.2 |
| T5 Significant deviation | 90–95° or 145–150° | −5 to 3.4 |
| T6 Severe deviation | < 90° or > 150° | −10 to −5 |
Related measurements
References
- Legan HL, Burstone CJ. Soft tissue cephalometric analysis for orthognathic surgery. J Oral Surg. 1980;38(10):744–751.
- Powell N, Humphreys B. Proportions of the Aesthetic Face. Thieme-Stratton; 1984.