Allograft is placed not only mesiodistal (Fig.2,4 *), but also buccolingual (Fig.3,5,6 *) to cover the exposed implant threads.  In fact inability to place the implant deep is due to the apex of the implant (Fig.5,6 x) touching the lingual (L) cortical plate.  B: buccal.  Retrospectively, pre-op CT is needed.

Guide Mandatory Last Next Xin Wei, DDS, PhD, MS 1st edition 10/22/2019, last revision 05/10/2020