Evaluation of PEEK Versus Titanium Bar Attachments With Implant Assisted Mandibular Complete Overdenture Fabricated by CAD/CAM Technology

Inclusion Criteria: * • Completely edentulous patients free from systemic diseases that may affect soft or hard tissue healing. * Patient's age ranges from 40 to 60 years old. * The bone quality and quantity of the mandibular alveolar ridge must fulfill the criteria for implant placement. * They have normal class Ӏ maxilla-mandibular relationship and sufficient inter-arch space with at least 25mm for bar attachment. * They have good oral hygiene. Exclusion Criteria: * Systemic disorders that may influence soft or hard tissue healing as oral diseases. * Patients with history of radiation therapy in the head and neck region. * Patients with neurological or psychological problems that may impair good oral hygiene.