After extraction of the tooth #31 with mesial root fracture and a buccal fistula (Fig.1 <) and debridement, cortical/cancellous (50/50) mineralized allograft (.5-1 mm) saturated with ~ .3 ml of .3 mg/ml of rhPDGF-BB (one component of GEM21S) is placed in the socket.   舍不得孩子，套不到狼 58岁女右下7根裂，颊侧骨板缺失，瘘道（图一：箭头）。Semi Sticky Bone     Last     Next   Xin Wei, DDS, PhD, MS 1st edition 03/12/2020, last revision 01/21/2021