Lateral cephalogram calculation by Alexander method online
R. G. "Wick" Alexander · 1970s+
Treatment goals
Alexander Discipline summary: skeletal class, FMA, incisor inclination with an SN-MP-individualized norm, occlusal plane, lower incisor to A–Pog, and lips to the E-line.
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About the method
The Alexander Discipline summary collects the measures R. G. Alexander used to set goals for fixed appliance treatment. Skeletal class comes from SNA, SNB, and ANB, vertical pattern from FMA and SN-MP. Incisor inclination is compared with an individual norm that shifts with SN-MP. Lower incisor to A–Pog and lips to the E-line link the dentition to the profile. CephCalc calculates everything from one tracing.
What the analysis focuses on
SNA, SNB, ANB, FMA, SN-MP, I-SN and i-MP with individual norms, Ii, OP–SN, L1–APog, E-line.
When to use it clinically
Fits the record before bonding: you see how much torque the incisors need for this growth pattern. With a high SN-MP the lower incisor norm drops, and the table accounts for it. L1–APog and the E-line help you discuss profile changes with the patient. For skeletal prognosis, add Kim or Björk on the same image.
What CephCalc calculates
21 landmarks
12 measurements
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
SN-MP: ∠ SN-MP — angle between S–N and the mandibular tangent K2–Me
i-MP: ∠ i-MP — lower incisor inclination B1–B2 to the K2–Me plane
I-SN: ∠ I-SN — upper incisor inclination A1–A2 to the S–N plane
Ii: ∠ Ii — interincisal angle between incisor axes
OP-SN: ∠ OP–SN (Steiner) — occlusal plane ii–P6 to S–N
L1-APog: L1–APog (mm, Ricketts) — lower incisal edge to the line A–Pog (+ anterior)
E-Ls: E-Ls (mm) — distance from Ls to the esthetic line Pn–PogSoft (+ lip anterior to line)
E-Li: E-Li (mm) — distance from Li to the esthetic line Pn–PogSoft (+ lip anterior to line)
Try it in practice — free
Try it in practice
Upload a lateral cephalogram to CephCalc, place the landmarks, and run the Alexander 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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