Accuracy of lingual straight-wire orthodontic treatment with passive self-ligating brackets and square slot: a retrospective study.

Objectives: To investigate the accuracy of torque, tip and rotation and linear intra-arch movements yielded by passive self-ligating lingual straight-wire appliances with brackets featuring square slots.

Materials And Methods: Twenty-five adult Caucasian patients (16 females and 9 males; mean age 26.5 ± 4.