Fig.9: Pre-op lateral view (right) shows the tooth #4 rotates 180 degree, while the lower 2nd primary molar (T) retains and submerges for the 13-year-old patient. The tooth #31 is in linguoversion.  There is space for it to upright.

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Xin Wei, DDS, PhD, MS 1st edition 07/12/2013, last revision 07/12/2013