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. 2019 Jul-Aug;24(4):93–109. doi: 10.1590/2177-6709.24.4.093-109.sar

Figure 23. A) Clinical case demonstrating a sagittal occlusal relationship between the arches' in unilateral Class II molars, in which there were a complete Class II on the right side and a Class I relationship on the left side. B) The maxillary dental midline was deviated 3mm to the left in relation to the middle sagittal plane, while the mandibular dental midline was centralized. The chosen treatment was by the use of mini-implant in the IZC and asymmetric mechanics for unilateral distalization. The system was composed of rectangular 0,017 x 0,025-in steel archwire, used to adapt a modified hook with greater cervical extension (15 mm) in order to have the force action line as close as possible to the center of resistance (Cr) of all teeth and a translation movement of the midline could be obtained. The mini-implant is located in the same line as the modified hook, mesial to the canine. Because the patient presented a symmetrical mandibular occlusal plane (red dotted line) in relation to the frontal occlusal plane, thus, in order to prevent any inclination, a force parallel to the occlusal plane was required. C) Case completion.

Figure 23