A, B) Type I pattern: surface-treated mini-implants placed in the maxillary right and mandibular left quadrants, and the non-surface-treated mini-implants were placed in the maxillary left and mandibular right quadrants. C, D) Type II pattern: surface-treated mini-implants placed in the maxillary left and mandibular right quadrants, and non-surface-treated mini-implants placed in the maxillary right and mandibular left quadrants. 