Discussion :
Lateral Sinus floor elevation is one of the most widely used
augmentation procedures. It enables implant placement in the posterior
region of an atrophic maxilla, where the bone is generally reduced as a
result of two phenomenons : alveolar ridge resorption due to increased
osteoclastic activity following tooth loss and sinus extention due its
pneumatization (11).
While sinus floor elevation by the transalveolar approach is indicated
in moderate vertical defects (>= 7mm), the lateral approach
is used when facing severe maxillary atrophy (ridge hight
<6mm). A minimal residual height of 4mm indicates immediate
implant placement, otherwise, the bone quantity would be insufficient to
obtain primary stability, and implant surgery must be delayed (table 1)
(5).