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A 29-year-old man has crowding (especially cross bite of UR7 and U5s, Fig.1,3,4) associated with extraction of UL6 for a month (Fig.3,4). UL1 incisal edge is fractured due to protrusion.
Xin Wei, DDS, PhD, MS 1st edition 06/26/2019, last revision 06/26/2019