The location of endosseous implants in posterior edentulous maxilla is generally a difficult assignment in implant dentistry because of maxillary sinus pneumatization. Various sinus augmentation techniques were used with marvelous achievement rates aimed toward growing these sites for implant placement. Knowledge of anatomy of maxillary sinus guides not only in proper preoperative treatment planning but also helps to avoid the possible complications that may arise during sinus augmentation procedure. The patients with atrophic maxillae requiring implant treatment can advantage considerably...