Dai FF, et al. - A total of 30 candidates were estimated to quantify the achieved vs predicted tooth movements of maxillary first molars and central incisors in cases of first premolar extraction managed with Invisalign. They observed the achievement of greater mesial tipping, mesial translation, and intrusion in first molars vs predicted. They also noted that central incisors achieved less retraction and higher lingual crown torque and extrusion as compared to predicted. They found greater differences between predicted and achieved tooth movement (DPATM) in the mesiodistal translation of first molars and labiolingual translation of central incisors in adolescents with smaller DPATM in the occlusogingival translation of the first molars and crown torque of the central incisors than adults. They reported greater DPATM in the mesiodistal translation of the first molars in the 3-mm vertical attachment group vs the G6-optimized attachment group. They also observed an inverse correlation of initial crowding with DPATM in angulation and mesiodistal translation of the first molars.