Facial Analysis

Facial Analysis: Introduction & Proportions - Face Value Fundamentals

• Goal: Objective evaluation for diagnosis, surgical planning & outcome assessment.
• Vertical Thirds: (📌 Mnemonic: Tall Giraffes Seldom Meet for landmarks Tr-G-Sn-Me)
  • Upper: Trichion (Tr) to Glabella (G)
  • Middle: Glabella (G) to Subnasale (Sn)
  • Lower: Subnasale (Sn) to Menton (Me)
  • Ideal ratio: 1:1:1.
  • Lower third division: Upper lip (Sn-Stomion) $1/3$, Lower lip-chin (Stomion-Me) $2/3$.
• Horizontal Fifths:
  • Face divided into 5 equal segments.
  • Each segment = width of one eye (intercanthal distance).
  • Intercanthal distance ≈ Alar width.
• Frankfort Horizontal Plane: Porion (Po) to Orbitale (Or). Basis for cephalometric analysis.
• Angle of Facial Convexity: Glabella (G) - Subnasale (Sn) - Pogonion (Pog). Ideal: ~12° (Range 8-16°).

⭐ The Rule of Thirds and Fifths provides a fundamental framework for assessing facial symmetry and proportion.

Facial Analysis: Key Facial Angles & Lines - Geometry of Glamour

• Nasofrontal Angle (NFrA): Glabella-Nasion to Nasion-Tip. Ideal: 115-130°.
• Nasofacial Angle (NFA): Facial plane (Glabella-Pogonion) to Nasion-Tip. Ideal: 30-40°.
• Nasolabial Angle (NLA): Columella-Subnasale-Upper Lip. ♂: 90-95°, ♀: 95-110°.
• Mentocervical Angle (MCA): Submental line to anterior neck line. Ideal: 80-95°.
• Facial Convexity Angle (Legan): Glabella-Subnasale-Pogonion. Ideal: 8-12°.
• Ricketts' E-line: Pronasale to soft tissue Pogonion.
  • Upper lip: 4mm posterior.
  • Lower lip: 2mm posterior.
• Holdaway's H-line: Soft tissue Pogonion to Upper lip. Nose tip on/anterior.
• Zero Meridian Line (Gonzalez-Ulloa): Vertical from Frankfort horizontal via Nasion. Pogonion on/posterior.

⭐ Ricketts' E-line: Ideal lip position: upper lip 4mm posterior, lower lip 2mm posterior to Pronasale-Pogonion line.

Facial Analysis: Regional Analysis Highlights - Zone In On Features

• Forehead/Brow:
  • Brow position: Female ~1cm above supraorbital rim (SOR), arched; Male at SOR, flatter.
  • Brow peak: Aligns with lateral limbus.
• Eyes/Periorbital:
  • Intercanthal distance (ICD): 30-34 mm (≈ alar width).
  • Palpebral fissure height: 8-12 mm.
  • Tarsal platform show (TPS): 4-6 mm.
  • Canthal tilt: Positive (lateral canthus 1-2 mm > medial).
• Nose: (Integrate with overall facial harmony)
  • Alar width ≈ ICD.
  • Tip-defining points: Bilateral, symmetric.
• Lips/Perioral:
  • Upper lip length (subnasale-stomion): 18-22 mm.
  • Maxillary incisor show (at rest): 1-4 mm.
  • Vermilion height ratio (Upper:Lower): Approx. $1:1.6$.
  • Commissure orientation: Neutral to slightly upward.
• Chin/Mandible:
  • Chin projection: Assessed with reference lines (e.g., Riedel's, Goode's).
  • Labiomental angle: 120-130°.
  • Mandibular angle: Clearly defined.

⭐ The Frankfort horizontal plane (infraorbital rim to superior auditory meatus) is a crucial reference for assessing facial proportions, particularly chin projection.

Facial Analysis: Assessment & Variations - Diverse Faces, Dynamic Changes

• Systematic Assessment:
  • Global (overall harmony), Regional (e.g., periorbital), Local (e.g., ala).
  • Standardized photography: Frankfort horizontal plane parallel to floor.
  • Anthropometry: Key to surgical planning.
• Facial Proportions & Angles:
  • Vertical Thirds: Upper (trichion-glabella), Middle (glabella-subnasale), Lower (subnasale-menton) - ideally equal.
  • Horizontal Fifths: Each fifth ≈ intercanthal distance.
  • Nasofrontal angle: 115-130°.
  • Nasolabial angle: M: 90-95°, F: 95-110°.
  • Mentocervical angle: 80-95°.
• Key Variations:
  • Age: ↓ elasticity, volume changes, bony resorption.
  • Ethnicity: Diverse skeletal & soft tissue profiles.
  • Gender: Distinct masculine/feminine ideals.
• Dynamic Evaluation: Assess facial muscle function & symmetry during animation.

⭐ The Frankfort Horizontal Plane (infraorbital rim to superior auditory meatus) is crucial for standardized facial assessment.

High‑Yield Points - ⚡ Biggest Takeaways

• Facial thirds (upper, middle, lower) should be equal for ideal harmony.
• Facial fifths: Intercanthal distance equals eye width and alar width.
• Ideal nasofrontal angle is 115-130°.
• Nasolabial angle: 90-95° (males), 95-105° (females).
• Mentocervical angle should be 80-95°.
• Frankfort horizontal plane (porion to orbitale) is a crucial reference.
• Ricketts' E-line: Lips 2-4 mm posterior to line from pronasale to pogonion.