Lateral cephalogram calculation by Linear analysis method online
Composite linear analysis · classic form
Dimensions in millimetres
Linear lateral ceph analysis: anterior cranial base, anterior and posterior face heights, mandibular body and ramus lengths, incisor and first molar dentoalveolar heights, and molar to PTV. Requires a ruler on the image.
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About the method
Linear analysis collects lateral ceph dimensions in millimetres: anterior cranial base length, anterior and posterior face heights, and mandibular body and ramus lengths. Incisor and first molar dentoalveolar heights show where elongation or shortening developed. Upper molar to PTV helps you judge space for distalization. The calculation needs a ruler on the image: without calibration, millimetres stay empty.
What the analysis focuses on
N–S, N–ANS, ANS–Me, N–Me, lower face share, S–Go, Go–Me, Ar–Go, incisor and molar heights, U6–PTV.
When to use it clinically
Helps you tell whether an open or deep bite is dentoalveolar or skeletal. In vertical problems, compare U6–NL and L6–MP with face heights. Linear norms depend on age and sex, so read them with growth in mind for children. Check scale against the cephalostat ruler, not the file size.
What CephCalc calculates
17 landmarks
17 measurements
N-S: N–S (mm) — anterior cranial base length
N-ANS: N–ANS (mm) — upper anterior face height
ANS-Me: ANS–Me (mm) — lower anterior face height
N-Me: N–Me (mm) — total anterior face height
ANS-Me/N-Me: ANS–Me / N–Me (%) — lower face share of anterior face height
S-Go: S–Go (mm) — posterior face height
S-Go/N-Me: S-Go/N-Me (%) — ratio of posterior to anterior face height
Go-Me: Go–Me (mm) — mandibular body length
Ar-Go: Ar–Go (mm) — ramus height
U1-NL: U1–NL (mm) — upper incisor height: A1 perpendicular to the palatal plane
U6-NL: U6–NL (mm) — upper first molar height: U6 perpendicular to the palatal plane
L6-MP: L6–MP (mm) — lower first molar height: P6 perpendicular to K2–Me
U6-Ptv: U6–PTV (mm, Ricketts) — U6 to the Frankfort perpendicular through Ptm
SNA: ∠ SNA — angle between lines S–N and A–N (maxillary position relative to the cranial base)
SNB: ∠ SNB — angle between lines S–N and B–N (mandibular position)
ANB: ∠ ANB — difference in jaw positions: angle between B–N and A–N
Try it in practice — free
Try it in practice
Upload a lateral cephalogram to CephCalc, place the landmarks, and run the Linear analysis analysis online — no software to install. Try it in practice free.
Ready-made method preset on your radiograph
Table of angular and linear measurements with race-specific reference norms (Caucasoid, East Asian, African)
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