Table 2. Amount of tooth displacement of maxillary incisors and maxillary first molar according to orthodontic miniimplant position and length of anterior retraction hook in both models with extraction of the first premolar (Model 1).

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.