Fig. 3

Measuring image capture. The natural position of the head is adjusted in three dimensions. a The horizontal view. b The coronal view. c The sagittal view. A bunch of cutting lines (green) was vertical to incisor labial surface (d) and located at the central coronal view (e). The median sagittal views were established with nine layers (f–n), interval 0.10 mm, and the middle one was the measuring image (j)