A Study Comparing Patient Satisfaction and Retention of CAD /CAM Milled Complete Dentures and 3D Printed CAD/CAM Complete Dentures Versus Conventional Complete Dentures: A Randomized Clinical Trial

Patient examination and diagnosis will be made at the outpatient clinic, department of prosthodontics, faculty of Dentistry-Cairo University. Eligible Patients following the inclusion criteria will be consented to enrol in the trial. Randomization and allocation concealment will be done through sealed envelopes having groups for interventions and comparator. Each patient enrolled in the trial will pick an envelope having either the intervention or control group.

Preliminary impressions will be made and poured to study casts. Customizing trays from autopolymerising acrylic resins for final impressions with Zinc Oxide Eugenol , then impressions will be poured into dental stone producing master casts. Record bite blocks will then be constructed and bite registration will be made.

All bite records with their corresponding master casts will be digitalized by an extraoral desktop 3D scanner having the station sequence of scanning upper cast, lower cast then bite registration to be stored as standard triangulation language (STL) files.

STL files are then imported to EXOCAD design software designing full dentures with their permanent bases, teeth sizes and shapes following the recorded inter-arch space. Full upper and lower designed denture bases will be stored as STL files ready for manufacturing.

In first Intervention: STL files will be imported to SHERA CNC CAM software ready for nesting each file for the suitable PMMA block size and height, ready for milling them in denture bases with SHERA 5-axis Eco-mill milling machine . After milling denture bases, acrylic teeth will be chosen for each patient with the suitable shade and size following the inter-arch space, then glued by auto-polymerizing resin in their corresponding sockets in the milled denture bases.