Digital Impression Techniques of Full Arch Implant-supported Screw-retained Restoration

aim: to compare the accuracy of the conventional and digital impression when will be performed on implant level or abutment level in Complete digital workflow for construction of full arch implant supported screw-retained restoration.

Inclusion Criteria: * Free from any systemic disease that may interfere with proper Osseointegration of implants, which will be assessed by thorough medical investigations. * Patients having completely edentulous maxilla and mandible for at least 6 months after the last extraction. * Normal maxilla mandibular relationship with adequate inter-arch space as verified by tentative jaw relation. * Sufficient residual alveolar ridge. Exclusion Criteria: * Local or general contraindications for surgical procedures. * Patients with TMJ disorders or poor neuromuscular coordination or parafunctional habits. * Severe inter-maxillary skeletal discrepancy or limited inter-arch space. * Heavy smokers.