Fig. 4
From: Accuracy and stability of computer-aided customized lingual fixed retainer: a pilot study
Measurement of WCI. A Initial scan model with three dimples. B Setting of reference plane (dotted line), five interproximal surfaces (solid line) and five reference points. Yellow area indicates the part excluded when superimposing. C After superimposition between the initial scan model and the model with the retainer attached. D Length measurement between two points in five interproximal areas