It would be ideal to apply a non-resorbable membrane to the buccal opening at #27,28 (Fig.8 white line) prior to perio dressing placement.  In case of dislodgement of the latter, the membrane is able to keep bone graft in place.

Intraop Modification

Xin Wei, DDS, PhD, MS 1st edition 08/20/2015, last revision 08/20/2015