Polyetheretherketone vs Cobalt-chromium Telescopic Removable Partial Denture in Kennedy Class I Patients Regarding Oral Health Related Quality of Life

Inclusion Criteria: * \- Kennedy Class I Partially edentulous patients. * Patients with good oral hygiene. * The distal abutment bilaterally should be a premolar. * Abutment teeth should be in a good periodontal condition. * Sufficient inter-arch space, any super-eruptions should be treated before beginning of treatment. * There should be no modifications spaces in the arch to be treated, and if found it should be treated with a fixed partial denture first. * Normal tongue size * Medically free from any disease that might affect bone support * Patients with no history of bad oral habits as (Bruxism or Clenching) and free from any T.M.J disorders. Exclusion Criteria: * Patients with bad oral hygiene. * Teeth with severe malalignment. * The arch to be treated is opposed by a completely edentulous arch. * Unmotivated patient. * Patient with a medical disease that will hinder his ability to be committed to the treatment. * Patients on a radiation therapy. * Patients with xerostomia. * Patients with a history of drug, alcohol abuse or psychiatric disorder.