Figure 17. Initial photographs: A) Without brackets, and B) with brackets from second molar to second molar, occlusal build-up and retraction biomechanics of mandibular teeth. Mechanics with mini-implants in the BS for en masse retraction of mandibular dentition, in patient with Class III malocclusion and retreatment. A mandibular CuNiTi 0,014 x 0,025-in archwire was used. This mechanics lasted four months. In C, the sagittal relationship correction and improvement in the vertical direction can be observed, caused by the rotation of the occlusal plane, due to the force action line being occlusal to the center of resistance of the arch. Thus, a moment is created, causing incisor extrusion and molar intrusion. In D and E, the comparison between the initial profile and after four months of treatment: there is a discernible improvement in the facial profile, especially in the lower lip, which was retracted after mandibular incisor lingual movement.