Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40510-018-0255-8/MediaObjects/40510_2018_255_Fig1_HTML.png)
Initial positions and maximum rotation angles, Δθ, when archwires of 0.021, 0.018, and 0.016 in. are inserted into a bracket of 0.022 in.. a 0.021 in. b 0.018 in. c 0.016 in
Initial positions and maximum rotation angles, Δθ, when archwires of 0.021, 0.018, and 0.016 in. are inserted into a bracket of 0.022 in.. a 0.021 in. b 0.018 in. c 0.016 in