It appears that the socket shield (Fig.16 S) causes infection and loss of bone graft (*). With periosteal relief and placement of sticky bone (Fig.7 *), PRF and 6-month membrane, the wound is closed with 4-0 PTFE suture (Fig.5).
Xin Wei, DDS, PhD, MS 1st edition 12/16/2019, last revision 12/16/2019