Correlation Between Vitamin D Serum Level and Early Implant Failure

Inclusion Criteria: * 1\. Patients with vitamin D sufficient, insufficient, and deficient according to Enzyme Immunoassay test. 2. Patients with horizontal ridge width and vertical ridge height, according to class III of Cawood and Howell classification. 3. Patients with matched parameters of implant including diameter, length and manufacturing. 4. Patients' compliance to oral hygiene measures. 5. Compliance with all requirements in the study and signing the informed consent. 6. Patient with sufficient inter arch space. Exclusion Criteria: * 1\. Patients with diseases of the immune system or any medical condition that may influence the outcome. 2. Patients with history of intravenous and/or oral bisphosphonate use. 3. Pathologic lesions in the site of implant placement. 4. Patients who are pregnant or lactating mothers. 5. Smokers patients. 6. Patients with poor oral hygiene habits that are not amenable to motivation and improvement. 7. Patients with history of irradiation of the head and neck region. 8. Patients who need pre-surgical augmentation for the alveolar ridge or sinus lift. 9. Patients need immediate implant placement.