Fig. 3

Within the local coordinate systems of each tooth, the displacements of crown points and rotation of teeth were shown. Tooth numbering according to the FDI tooth numbering system. Con, conventional attachment design. CLA, canine lingual attachment design. 0°, upright canine group. 10°, canine with 10°mesial tipping angle group. −10°, canine with 10°distal tipping angle group