The lingual exposed threads are covered by allograft and collagen membrane after placement of a healing abutment (8.2x5(4) mm, Fig.5).  Perio dressing is applied to cover the wound.  The patient is doing well postop.

Sinus Lift Using Trephine Bur

Xin Wei, DDS, PhD, MS 1st edition 09/02/2015, last revision 09/02/2015