Figure 10: Patient treated with unilateral Class II elastic in the final phase of treatment, promoting cant of the lower occlusal plane ( roll axis ) by extrusion of the posterior region and intrusion of the anterior region on the left side. Vertical elastic was then used on the left side, associated to an asymmetric curve in the archwire to level the lower plane. The upper arch required slight extrusion on the left side, so the extrusive effect was not considered adverse, as it promoted the leveling of the upper arch.