The tendency of the alveolar ridge to progressively resorb after tooth loss & typically poor quality of posterior maxillary bone, rehabilitation of this region with implant supported prosthesis has been challenging.
Anatomically maxillary sinuses are largest paranasal air cavities limited by six walls, separated from the nasal cavity, containing the neurovascular bundle & covering the tooth root by a Schneiderian membrane. The blood supply of the maxillary sinus is derived from the branches of maxillary artery, posterior superior artery, infraorbital artery & descending palatine artery. Anatomical knowledge of sinus vascularization is necessary to prevent bleeding complications during the sinus lift procedure.
Therefore, the surgical procedure of maxillary sinus lift has undergone considerable development & different variations with autogenous bone regarded as the preferred option.
Factors to satisfy the criteria for sinus augmentation are:- -residual bone 10mm in height -absent pathological condition/fibrous scars -absence of multiple maxillary teeth & need for strong sinus floor for multiple implants