Clinical Assessment of the Efficacy of Amy Check Versus Osstell Regarding the Accuracy of Implant Stability Measurements When Inserted With Graftless Closed Sinus Lifting: A Randomized Controlled Clinical Trial

Inclusion Criteria: 1. Patient age should be \> 18 years of age. 2. Patients included are ASA I and ASA II. 3. Both males and females will be included in the study. 4. Patients with need of tooth replacements in the maxillary premolar and molar area where the residual alveolar bone height ranges from 4-7 mm. 5)Compliance with all requirements in the study and signing the informed consent. Exclusion Criteria: 1. Patients with immunological diseases or diseases affecting bone healing. 2. Patients suffering from uncontrolled systemic diseases. 3. Patients with active acute infection related to the planned implant site, maxillary sinusitis or pathosis. 4. Patients with parafunctional occlusal habits. 5. Patients with bad oral hygiene. 6. Patients who are alcohol and drug abusers. 7. Patients who smoke. \-