After loss of teeth in the posterior maxilla, the alveolar ridge decreases by bone atrophy and
pneumatization. Different strategies for implant placement have been developed using one- or
two-stage procedures, which involve either simultaneous placement into the augmented sinus
graft or secondary placement after reconsolidation of the bone graft. Various bone grafting
materials have been used in sinus augmentation including autogenous grafts, freeze-dried
bone allografts, hydroxyapatite, and xenografts.