- Open the CBCT in the viewer, open the 3D panel and, under Surface overlay, load the .stl or .ply file. Check the unit factor it shows.
- Use the move and rotate sliders to put the scan roughly on the teeth — within a few millimetres is enough.
- Turn on the VOI box and size it around the arch, so the fit only sees the teeth.
- Under Fit to surface, choose teeth and click Fit. Read the result: the residual (mm), the share of the model within 0.5 mm, and how far it moved. Green is a good fit; amber means move it closer or narrow the box and fit again.
- Click Keep this fit to accept it, or Discard to put the model back. The fit is kept only when you accept it, and no measurement reads the model.
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