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After debridement, the mesial socket is large, while the septum is thin, irregular and with mesiobuccal undercut (Fig.3). It seems difficult to obtain primary stability for an immediate implant. 由于近中牙槽窝大，中隔（图三 S）近中有倒凹（缺损），决定植骨，使用两种生物活性材料（图四）。
Xin Wei, DDS, PhD, MS 1st edition 07/13/2020, last revision 09/14/2020