Evaluation of the All-on-three Concept in Mandible.

Inclusion Criteria: * Completely edentulous patients with skeletal Class I maxilla-mandibular relationship. * Adequate inter-arch space (22 mm), measured using the "try in" before any intervention. * Male or female patients aged between 40 and 60 years. * Maxillary and mandibular ridges with no history of recent extraction. * Mandibular ridge should be ≥15 mm in height and ≥7 mm in width to accommodate three implants in the intra-foramina area of the mandibular arch, verified by using cone beam computed tomography (CBCT). Exclusion Criteria: * History of radiotherapy in the head and neck region. * History of hard tissue augmentation. * Presence of any intra-oral pathological condition. * Any medical disorder that could complicate the surgical phase or affect osseointegration, such as osteoporosis, uncontrolled diabetes, and hypertension. * Smoker and bruxer patients.