Due to short apical bone (Fig.5,7), a long dummy implant (3.8x15 mm) is placed with periimplant space immediately post extraction (Fig.1 *).   The final implant is larger (4.5x15 mm) with simultaneous periimplant bone graft (Fig.2 <，当时骨粉一定用的多，压得紧，好像进入螺纹).  The native bone (higher in bone density, Fig.9 white arrowheads, as compared to black one (for bone graft)) appears to have grown into the space between implant threads 5.5 months postop.  Sinus Lift Last Next XinWei, DDS, PhD, MS 1st edition 06/21/2019, last revisionn 06/13/2021