Immediate Loading of Four Single Piece Compressive Implants for Bar Retained Mandibular Overdenture

Inclusion Criteria: * They were healthy, free from any systemic diseases relating to the bone resorption such as uncontrolled diabetics or osteoprosis .This was achieved through medical history and clinical examination by physician. * They have completely edentulous maxilla opposed by completely edentulous mandible * All patients have sufficient inter-arch space for overdenture and milled bar construction not less than 12mm * All patients are of Angel's class I maxillo-mandibular relationship. * All patients must have mandibular bone height interforaminally not less than 8-10 mm as verified by cone beam C.T. Exclusion Criteria: * Patients with systemic issues such as recent myocardial infarction, hepatic patients, bleeding disorders, autoimmune diseases, hyperparathyroidism * Uncontrolled diabetes mellitus * Severe osteoporosis * Cancer * Recent organ transplants, long-term corticosteroid use * Radiotherapy * Uncooperative patients with psychiatric disorders * Heavy smokers * Poor oral hygiene * Parafunctional habits