Clinical Evaluation of Stability of Dental Implant Placed Simultaneously With Closed Sinus Lifting Using Hydraulic Lift Technique Versus Summer's Osteotome Technique in Posterior Edentulous Maxilla (RCT)

Inclusion Criteria: * Edentulous patients in the maxillary posterior region. * Patients in need to fixed restorations in posterior region. * Patients with healthy systemic conditions. (Apparently medically free) * Patients with adequate inter-arch space for placement of the prosthetic part of the implant . * Patients who had approximately 5-8 mm of available bone height between crest of bone and floor of sinus * Both sexes. * Patients with Good oral hygiene * Patients more than 20 years old * Cooperative and motivated patients Exclusion Criteria: * Patients with local pathological defects related to posterior maxilla. * Heavy smokers. * Abnormal habits that may alter results such as alcoholism or parafunctional habits. * Patients with systemic diseases that may affect normal healing. * Patients with psychiatric problem * Patients with history of recent radiation therapy to the head and neck area. * Patients with aggressive periodontitis.