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• In execution of the growth tracing, positive LogEtronic film is made and traced for each of the radiographs in the series, and the positives are superimposed as described. • The Nasion –Sella line can be used in growth analysis only after adjustments have been made for forward displacement of Nasion and remodeling of Sella. • The practical method consists in placing a sheet of cellophane, with printed cross-lines on the top of the first film of a series, passing through the nasion with the center of the cross-lines at the Sella point www.indiandentalacademy.com