Ossogen (allograft, Fig.2 *) is placed around the septum (red dashed line).  The socket opening is covered by BioXclude and approximated with 4-0 PGA suture, followed by periodontal dressing.  With the septum's support, bone graft is expected to heal without too much ridge collapse.  The mesial and distal sockets behave as 2 small premolar ones, getting ample blood supply.拔除位点保存似乎是最佳方案（图二（*：骨粉；红线：中隔）），胎盘膜覆盖，4-0 PGA缝线。根据手术记录，颊侧骨板缺失。

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Xin Wei, DDS, PhD, MS 1st edition 01/22/2020, last revision 11/11/2020