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Superimposition of lateral cephalograms shows measurements of tooth movement. SN indicates Sella-Nasion; U1, the maxillary central incisor; L1, the mandibular central incisor; IMPA, incisor mandibular plane angle. Positive values denote extrusive and labial movements, while negative values denote intrusive and lingual movements. Δ U1 to SN and Δ IMPA refer to the changes in measurements between before (T1) and after (T2) treatment (Δ = T2 – T1).
