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3D superimposition after intrusion of the maxillary first permanent molar. (a) Superimposition between pre- and posttreatment (T1–T2) at the mesiobuccal cusp of the maxillary right first permanent molar showed three values on the z-, x-, and y-axes. (b) Superimposition between post-treatment and retention (T2–T3) at the mesiobuccal cusp of the maxillary right first permanent molar showed three values on the z-, x-, and y-axes.
