He does not have finance for implants now.  After extraction and debridement, 1 cc of Bond Apatite is applied to the sockets (Fig.4), because of easy and quick application.  The apical space of #21 is not filled.   In fact it is not critical.  When 4 bony walls exist, do not use any tool to push the cement into the bottom of the socket as you are used to with granules.  Doing so might cause pain to the patient due to the cement expansion.

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Xin Wei, DDS, PhD, MS 1st edition 02/27/2020, last revision 04/07/2020