1-2 mm Native Bone for Sinus Lift   

In fact the designed initial drills do not get to the bone with guides.  After use of the next length drills (1.5 mm longer with sharp end), the sinus floor perforates without membrane perforation.  Once 3.5 mm drill is used following sequential osteotomy, a 4x10 mm dummy implant is placed for sinus lift with 1 mm short of the depth and >50 Ncm.  Following the dummy implant removal, allograft in the amount of 2 to 3 amalgam carriers is delivered for sinus lift (Fig.1,2 white *), followed by implant placement (4.5x10 mm, >55 Ncm).  More allograft is placed before and after abutment insertion (black *).  As usual, an immediate provisional is fabricated at each site.  After removal and cleaning, the abutments are reseated and retorqued to 30 Ncm 11 months postop (Fig.3,4).  Sinus lift is indistinct 15 months postop (Fig.5,6), probably due to radiation overexposure, although placement trajectory is good.

Return to Upper Premolar Immediate Implant, Trajectory 导板与提升
Xin Wei, DDS, PhD, MS 1st edition 02/07/2019, last revision 02/05/2021