Fig. 4.

Distance between T1 and T2 models

(a) The landmarks identified on CT scan; (b) Bending angles of labial cortex and palatal cortex between T1 and T2 models; (c) Measurements of the retraction distance at the cusp tip of the crown and the apex of the root in sagittal plane between T1 and T2 models; (d) Vertical distance differences from UICE to LAC and PAC measured parallel to long axis between T1 and T2 models