Because of erupting 2nd molars (Fig.10,15), it is difficult to place rubber separators between U6/7. Copper ones are used instead (Fig.15 ^). Crowding and narrow arches (Fig.13,14) may be associated with the enlarged Inferior Nasal Concha (Fig.15 *).
Xin Wei, DDS, PhD, MS 1st edition 06/20/2019, last revision 06/21/2019