Aim: The aim of this study is to assess the incidence rate of sinus membrane tearing after sinus lift using both hydraulic and osteotome techniques in posteriorly edentulous maxilla. Methodology: Twenty-six patients with edentulous posterior maxilla with limited residual bone height, seeking for fixed restoration, were enrolled in this study. The residual bone height ranged from 6 mm to 8mm. All patients were randomly divided into two groups according to technique used for closed sinus lifting. The control group utilized Summers` osteotome technique and the study group utilized Hydraulic lift technique. Bone graft was placed in the osteotomy site with simultaneous implant placement for both groups. Incidence of sinus membrane tearing evaluated clinically by (valvalsa maneuver). Bone height gain was measured using CBCT immediately and 6 months post-operatively for both groups.