Evaluation of Digital Versus Conventional Techniques for Construction of Mandibular Implant Retained Overdenture

Inclusion Criteria: * healthy, free from any systemic diseases relating to bone resorption such as uncontrolled diabetics or osteoporosis. * Completely edentulous jaws for at least 1 year. * The angle's class I maxillomandibular relationship and have upper and lower completely edentulous arches. * Residual alveolar ridges covered with healthy firm mucosa. * All included patients' sufficient available length and width of mandibular bone to accommodate conventional implant. (At least 5 mm buccolingual width and 12 mm vertical height of bone). Exclusion Criteria: * Patients with systemic diseases that contraindicate implant placement such as hematologic diseases * metabolic diseases related to bone resorption such as uncontrolled diabetics or osteoporosis will be also excluded * History of para-functional habits (Bruxism, clenching), smoking and alcoholism. * History of radiation therapy in the head and neck region.