Fig. 3

Registration and superimposition in the FS-IOS workflow. (a) FS image of the patient using a cheek retractor. (b) IOS image of the patient at the PIP. (c) Registration of the exposed anterior teeth of the maxillary arch from the FS with the maxillary dentition in the IOS. The resultant registered head position is designated as OBJ file1. (d) Re-importing the FS image with a cheek retractor for further processing. (e) Registration of the exposed anterior teeth of the mandibular arch from the FS with the mandibular dentition in the IOS. The head position post-registration is named OBJ file2. (f) Overlapping image generated by loading both OBJ file1 and OBJ file2 simultaneously, facilitating comparative analysis of the two different head positions