If the septum is severely defective, an extra wide, but shorter implant (6.9x10 mm bone-level SM) is used (Fig.6).  Or an extra wide UF implant with extra 2 mm length may offer better primary stability (Fig.6' (with sinus lift)).  The primary stability of the extra wide implants is derived from contact with the mesial and distal socket walls.

Bone vs. Gingival Level Implants

Xin Wei, DDS, PhD, MS 1st edition 01/01/2015, last revision 01/01/2015