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Fig.9 (mirror image, 5 months after ortho treatment): bracket has been placed on the lower right 2nd premolar. Arch wire is partially engaged to it and extends distally to the third molar (not shown).
D: the distal residual root of the 1st molar.
Xin Wei, DDS, PhD, MS 1st edition 10/10/2013, last revision 05/02/2017