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After placement of a 5x11 mm implant and cover screw, allograft mixed with PRF (sticky bone) is placed in the peri-implant space, but it appears that bone density in the apical region (Fig.1 A) is lower than that in the coronal one (C) because of a constriction between the implant and the distal crest (*). A 4.5x1 mm temporary abutment is placed for an immediate provisional (incomplete seating). 欠缺植入根尖骨质不够，第二次手术植深。
Xin Wei, DDS, PhD, MS 1st edition 11/21/2019, last revision 03/18/2021