Treatment planning of surgical access to the impacted 7 (Fig.1) before CT analysis include extraction of 8 (Fig.2) and removal of the bone coronal to 8 (Fig.3 red) so that there will be no bony block to 7 eruption (Fig.4).  考虑经济问题以及小孩年轻愈合好，拔牙窝放置胶原骨（图8：OP （Osteogen Plug），与图三相比（计划用PRF））。7，8牙槽窝之间中隔（图三：红线； 图八：*）没有去除，应该随着牵引，萌出而消失。

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Xin Wei, DDS, PhD, MS 1st edition 09/26/2020, last revision 12/19/2020