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Fig.15: Seven months of treatment, extraction spaces have been closed or being closed. UL 2 has been moved into the arch. But its alignment needs to be improved with arch wire sequence for a second time starting with .0175 twisted wire on the top. The power chains associated with sling shot are just removed.
Xin Wei, DDS, PhD, MS 1st edition 05/31/2013, last revision 12/01/2013