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In the lower arch, the buccal surface of the crowns at #20 and 21 is reduced substantially so that the crowns functions as lingual anchorage. The abutment at #19 will be changed to an angled one; in the same way, the temporary crown at #19 is lingually positioned. With full arch brackets and bands, the tooth #18 is expected to be lingualized (Fig.6 arrows). Elastics can be placed between the left upper and lower molars (from upper lingual to lower buccal) to facilitate mutual shifting.
Reduction wheel is also required for banding. The teeth #20 and 21 are wide mesiodistally, as compared to the width of the corresponding teeth on the right side.
Xin Wei, DDS, PhD, MS 1st edition 02/05/2017, last revision 02/05/2017