Modified intrusive mechanics in the lingual segmented-arch technique. In the occlusal slots of the anterior and posterior lingual brackets, 0.018- × 0.018-inch stainless steel segmental wires were engaged. Additionally, 0.017- × 0.025-inch titanium-molybdenum-aluminum intrusion springs were engaged in the inner lingual slots of the first molar brackets and hooked to the anterior segment between the lateral incisors and canines to intrude the six mandibular anterior teeth.

IS, Intrusive spring; AS, anterior segment; PS, posterior segment; BSS, buccal stabilizing segment.