Table 3. Amount of tooth displacement of maxillary incisors and maxillary first molar according to orthodontic mini-implant position and length of anterior retraction hook in both models with residual extraction space of 1 mm (Model 2).

OMI, Orthodontic mini-implants; CI, maxillary central incisor; LI, maxillary lateral incisor; C, maxillary canine; FM, maxillary first molar; Δy, amount of tooth displacement in Y-axis; Δz, amount of tooth displacement in Z-axis.