Fig. 8 Fig. 9 gabled with β > α and horizontally activated about 4-5mm per side. A reverse curve was incorporated in the lower arch wire to maintain bite-opening during space closure. At the end of upper arch space closure (six months later), the protrusion had been reduced significantly. At this stage, the upper arch was ready for second-order root correction of the canine and premolars, and the third-order root correction of the incisors. Root correction requires large M:F ratios and good vertical and AP control to minimize side effects and undesirable equilibrium forces.5 A 19x25 TMA arch wire (with a helix to lower the load deflection rate, and symmetric V-bends) was engaged into the slots (Fig. 8). Root correction was completed in 19x25 SS, followed by sliding mechanics and Class II elastics for final space closure and to idealize the overjet (Fig. 9). First molar bands were removed and power chain placed 7-7 (toed-in arch wires) to close up band spaces. Occlusal detailing was completed in a 19x25 SS braided upper arch wires with seating elastics to a 19x25 SS lower arch wire (Fig. 10). The final records (Fig. 11) showed harmonious and well-balanced facial aesthetics. The upper incisors were intruded and retracted about 4-5mm by a combination of translation and controlled tipping, and the curve of Spee on the lower arch was leveled by incisor intrusion (Figs. 12 and 13). The total treatment time was approximately 26 months. Retention included a maxillary wrap around the 7s and a fixed lower 3-3 bonded only to the 3s. 32 JUNE 2018 // orthotown.com Fig. 10 Fig. 11 Fig. 12 Fig. 13http://www.orthotown.com