Evaluation of the Efficacy of Allograft Versus Tenting Technique in Open Sinus Lifting With Immediate Implant Placement

Inclusion Criteria: 1. Patient with missing upper pre molar , molar teeth 2. Patients in need of bone grafting of the maxillary sinus to house an implant. 3. Patients with residual alveolar crest of at least 3-4mm in height and 5mm in width distal to the canine as measured on CBCT scan 4. Patients with adequate inter-arch space Exclusion Criteria: 1. Patients suffering from any sinus pathosis. 2. Patients who are heavy smokers (\>10 cigarettes/day). 3. Patient under psychiatric therapy or unrealistic expectations 4. Patients of systemic conditions that may interfere with carrying out the surgical procedure. 5. Lack of opposite occluding dentition/prosthesis in the area intended for implant placement 6. Severe bruxism or clenching 7. Poor oral hygiene (full mouth bleeding on probing and full mouth plaque index \>25%)