Inclusion Criteria:  The average age of selected patients was from 55 -60 years .  Completely edentulous maxillary arch opposed by partially edentulous mandible with only remaining mandibular anterior teeth. All selected patients were free from any systemic diseases, All patients had Angle class I maxillomandibular skeletal relation, The distal extension ridge was well formed and covered by healthful, firm mucosa, Suitable abutments with healthy periodontal ligament and appropriate crown/root ratio (CRR) as verified by periapical radiograph.  The exclusion criteria to the patients were:  patients with any systemic disease that could affect the rate of bone resorption which confirmed by obtaining a medical history, Patients with Para-functional habits (Bruxism and clenching), Patients with any septic foci or impacted teeth as proved by panoramic radiograph, Patients with tilted or rotated abutments. Patients with soft tissue undercuts had involved in the design.