Fig.1 (preop, left side, mirror image): Molar Class II relationship (#3/30).

After extraction of the 1st premolar, the canine(#6)  is moved distal into Class I position, whereas the 2nd premolar (#4) may need to be moved mesial to less degree.

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Xin Wei, DDS, PhD, MS 1st edition 11/20/2013, last revision 11/20/2013