A = A trapdoor osteotomy is performed on the lateral wall of the maxillary sinus.
B = The trapdoor is infractured and the Schneiderian membrane is carefully dissected and elevated from the maxillary sinus floor to create a compartment for placement of the graft material.
C = The implant is inserted simultaneously with the augmentation procedure.
D = The graft material is densely packed around the exposed implant surface in the created compartment.