Since the primary stability of a 8x17 mm tapered tap is not high (Fig.3), a 8x14 mm cylindrical implant is placed (after try in of its dummy one) with > 50 Ncm (Fig.4).  The implant engages into the mesial and distal socket walls for stability.  A 6x3 mm abutment is placed for an immediate provisional.  In spite of difficult manipulation, the sinus membrane remains intact.  Vanilla graft is placed for sinus lift and buccal and palatal gaps.

Since IS implants are more or less cylindrical and if a 5 mm one does not achieve primary stability, a larger Tatum tapered tap should be tried immediately without using IS cylindrical taps.

Switch from IS to Tatum Implant Last Next Xin Wei, DDS, PhD, MS 1st edition 05/07/2018, last revision 10/07/2018