The removable appliance needs to be trimmed (Fig.11 ^) to let these 2 lateral incisors (#2) erupt naturally.  Since there is not enough space, these 2 teeth may remain in cross bite unless the removable appliance is modified (adding springs behind the lateral incisors).

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Xin Wei, DDS, PhD, MS 1st edition 08/09/2014, last revision 08/10/2014