Inclusion Criteria:  Patients of both genders requiring implant placement in posterior maxilla Age range: 40-60 years. Good oral hygiene Healthy maxillary sinus free from pathology The minimum crestal bone height is (4-6) mm Patients who are willing and fully capable to comply with the study protocol.  Exclusion Criteria:  Sinus infection Tumors or pathologic lesions in sinus Severe allergic rhinitis. Chronic topical steroid use. Radiation therapy. Psychologic / mental impairment Acute infection (periodontitis or mucosal infection Patients on radiotherapy or chemotherapy. Alcohol or drug abuse. Patient with systemic disorder (uncontrolled Diabetes mellitus, autoimmune diseases, bone diseases, etc.) Smokers Parafuctional habits