Digital Versus Conventional Full-arch Implant Impression in Maxillary Screw- Retained Implant Prosthesis

Inclusion Criteria: * patients with maxillary edentulous ridges opposing fully dentulous mandibular arch or with a minimum of six anterior teeth (canine to canine), and the utmost one or two premolar/molar missing in any quadrant * patients with compromised facial/lip support seeking a fixed prosthesis for their edentulous maxilla * having edentulous maxilla with adequate bone density and height to place six implants as assessed clinically and radiographically, and physically * psychologically eligible patients for implants placement. Exclusion Criteria: * debarred medically compromised patients * smokers * patients suffering from parafunctional habits.