The buccal plate of the socket of #4 is thin and short (Fig.1, 5B (coronal section of the socket) red area) with apical perforation (Fig.5B >).  Impression is taken after extraction and Epinephrine gauze packing.

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Xin Wei, DDS, PhD, MS 1st edition 02/22/2017, last revision 09/01/2018