In fact the pin perforates the lingual plate at #18 (Fig.4, as compared to Fig.3 (#19)).  It leaves in place.  Postop the wound dehisces with loss of allograft and exposure of the screws.  The wound heals gradually mesiodistal with exposure of #18 screw 2.5 months postop.  Follow up is disrupted by coronavirus pandemic.

Onlay Graft     Last     Next Xin Wei, DDS, PhD, MS 1st edition 12/19/2019, last revision 04/21/2020