the aim of this crossover randomized controlled clinical trial is comparing retention of 3D printed maxillary complete dentures produced from thermoplastic impression trays and conventional acrylic impression trays.

The research hypothesis is that there is no difference in patient satisfaction and retention of dentures constructed from definitive impression using the conventional tray and the prefabricated thermoplastic tray

Inclusion Criteria:

• Male edentulous patients.
• Cooperative and highly motivated patients.
• Patients with well or moderately developed ridges and healthy attached mucosa of appropriate thickness free from inflammation

Exclusion Criteria:

• Patients with recent extraction less than 3 months ago
• Patients with Parkinson's disease
• Patients with xerostomia.
• Patients with allergy to resins.
• Pathological changes of residual ridges.
• Patient with sever undercuts, or irregular bony exostosis.
• Patients with flabby and flat ridges.
• Patients with medical or psychological conditions that hinder co-operation.
• Patients with class II or III jaw relation.