Therefore a 4.5x9 mm final implant is placed with low torque.  Following 4x11.5 mm drill, the torque increases to 20 Ncm.  With insertion of healing screw, sticky bone (Fig.4 *: .5-1 mm cortical/cancellous allograft) is heavily packed around the implant (arrow), which apparently allows removal of the healing screw and placement of a 6x5.7(3) mm pair abutment without loosening the underlying implant.  More bone graft is placed (Fig.6), followed by 2 pieces of PRF membranes. 

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Xin Wei, DDS, PhD, MS 1st edition 07/02/2020, last revision 07/02/2020