Insights · How it is measured here · bony

Ramus : mandibular body ratio
what a photo can give, and how we take it.

Jaw taper and jaw:cheek width. The vertical ramus is hidden in any photo, so the ratio itself is not attempted. The two silhouette reads carry what it would have told you.

Also searched as ramus length, jawline length and mandibular ramus.

Why the textbook version needs more than a photo
bony
Canthion reports
Photographic equivalent

What we report

Jaw taper and jaw:cheek width. The vertical ramus is hidden in any photo, so the ratio itself is not attempted. The two silhouette reads carry what it would have told you.

ramusbodycondylion: insidethe jointgonion: on the boneramus : bodyideal 0.68 to 0.75applies to radiographs
The ratio needs the ramus (condylion down to gonion) against the mandibular body (gonion to the chin). Condylion sits inside the joint and gonion on the bone, so the cephalometric ideal of 0.68 to 0.75 applies to radiographs.

Why not the clinical number itself

The ratio needs two points. One is condylion, the top of the mandibular condyle, which sits inside the temporomandibular joint and is not externally visible at all. The other is gonion (see above). Neither exists in a photograph. Cephalometric ideals (~0.68–0.75, Jarabak-type ratios) apply to radiographs.

What we measure instead

Ratios of near-coplanar frontal distances, angles relative to the interpupillary line, and skin appearance. Each comes with an error bar, and each is placed against a population you choose. Start an analysis or read the methodology.

What the report gives you insteadJaw width

Same question, different measurement: what the clinical version needs, and what a photograph can give instead.

Gonial anglebony · what a photo can giveOrbital vector / infraorbital rim positionbony · what a photo can giveNasofacial angle, and any profile angle taken against a planelateral · what a photo can giveRicketts E-line, Steiner S-line, Holdaway H-linelateral · what a photo can giveOgee curve scoreinvented · what a photo can giveGolden ratio / Marquardt Phi mask fitrefuted · what a photo can give

What is measured instead

Intercanthal distance : palpebral fissure lengthEyes · tier AAlar base width : intercanthal distanceNose · tier AMouth width : alar base widthLips · tier AUpper : lower vermilion heightLips · tier APhiltrum length : chin heightLower face · tier APalpebral fissure height : lengthEyes · tier A
← Gonial angleNasofacial angle, and any profile angle taken against a plane →

How every bone-level measurement is taken here · methodology · glossary · all 35 insight pages