Six completely edentulous patients will be selected for this study from the outpatient clinic of the prosthodontic department~All patients will be informed about all surgical and prosthodontics procedures that will be done for them. All patients will sign the consent form of the ethical committee in faculty dentistry Mansoura University.~The patients will be divided into 2 groups~Control group: will receive implant-supported mandibular fixed metal acrylic prosthesis on 4 implants that were placed according to the All on four concept.~Study group: will receive implant-supported mandibular fixed metal acrylic prosthesis on two implants placed according to All On two concept.
The aim of this study will be the evaluation of patient satisfaction and oral health-related-quality of life (OHRQoL) of two versus four implants supporting fixed full-arch screw-retained metal acrylic hybrid mandibular prosthesis.