- Open the CBCT in the viewer and click 3D Ceph in the top bar. The panes switch to the four-up arrangement so the three slice panes are large enough to place points on (the 3D stays for checking); the tables are folded behind Tables until you want them, and your previous arrangement returns when you close the panel.
- Click a landmark name (nasion, sella, orbitale, porion, gonion, condylion …) and then click that point on whichever slice pane shows it best — or on the skull in the 3D pane, where the click lands on the bone surface under the cursor; the next unplaced landmark is selected automatically. Drag any placed dot to move it (on the 3D pane it slides along the bone). Right-click a name to remove its point; double-check a point by looking for its green dot on the other two panes.
- Read the tables: Skeletal (SNA, SNB, ANB, facial heights, SN–FH, FH–mandibular plane), By side (Co–Gn, Co–Go, Go–Me, gonial angle, right and left with the L−R difference) and Asymmetry (each bilateral landmark's distance from the midsagittal plane and its vertical position relative to Frankfort horizontal, plus the deviation of ANS, A, B, pogonion and menton from the midline).
- The midsagittal plane passes through nasion and sella and is perpendicular to the Frankfort plane you placed — it is built from your landmarks, not from how the patient sat in the scanner.
- The Reference column shows the published value (mean ± SD) beside each measurement that has one — Steiner, Tweed, Björk, Downs; hover for the source and population. It is reference data only: nothing is coloured, flagged or classified, so whether a value is within the norm is your sentence in the report. These are lateral-cephalogram norms; a 3D distance has no projection magnification, so linear norms read a little high against it.
- On the 3D pane the placed landmarks are drawn on the skull with the construction lines (cranial base and facial lines amber, Frankfort pink, dental and chin blue, bilateral widths violet); they follow as you rotate.
- PDF downloads a report with the 3D view as it is on screen, the three tables with their references, and the landmark coordinates; JSON downloads the same numbers for software; Copy tables copies them as text; Save snapshot keeps the landmarks with the study.
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