When the tooth #30 is extracted, the gingiva buccal to the septum (S in Fig.1,2 (P: papilla between the mesial and distal roots)) collapses.  Two pieces of gauze are placed in the mesial and distal sockets.  The permanent crown at #31 is removed so that the guide can rest on as a distal stop.

Defect Repair     Last     Next Xin Wei, DDS, PhD, MS 1st edition 05/13/2020, last revision 05/14/2020