Mixture of autogenous bone and allograft is placed to cover the exposed threads (Fig.3,5) following deep placement at #20.  For safety, the implant at #20 is buried.  A 3.5x4 mm ball abutment is placed at #22.

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Xin Wei, DDS, PhD, MS 1st edition 03/14/2019, last revision 03/15/2019