Based on the workflow suggested by the Ivoclar digital denture, conventional complete dentures will be scanned by using desktop scanner (Medit T710). The cameo and intaglio surfaces of the complete dentures will be scanned, and the scanned data will be exported as Standard Tessellation Language (STL) file to start the milling process.

For the milling process, monolithic denture will be milled from a bicolored disk (Ivotion). One side is the denture base material made of high impact optimized polymethyl methacrylate (PMMA) while the other is the teeth material made of highly cross-linked PMMA with no filler. The bicolor disk is milled in a 5-axis milling machine in wet condition, through an uninterrupted milling process. Following the fast milling process the dentures will be finished and polished.

The CAD/CAM monolithic dentures will be scanned with laboratory scanner (Medit T710) . Data from the scans will be stored in a STL format. The scans of the conventional dentures will be considered the reference STL files. The scans of each denture base will be imported into an analytic software program. All the study denture file will be separated into cameo, and intaglio portions, according to the software program processing protocol. To determine the trueness (root mean square (RMS)), measured in mm of conventional and monolithic complete dentures, comparisons will be conducted for the cameo, and intaglio portions. All the study sample STL files will be superimposed to the corresponding reference STL files using voxel-based best-fit alignment in the surface matching software. Color maps will also be produced to demonstrate the qualitative three-dimensional differences between the test and reference files

Accuracy will be verified by superimposing the tooth region data from the heat-cured and monolithic dentures on the tooth region data from the wax dentures using best fit algorithm of 3D data analytical software and measuring the displacement of the tooth arrangement. In addition, colour maps will be created using the 3D comparison function to visually display the direction and amount of tooth displacement. Using the software, a total of 48 measurement points will be established for maxillary dentures. Twenty-four measurement points will be defined on the anterior teeth: at the cusp tip or center of the incisal edge; at the mesio- and disto-incisal angles; and at the center of the lingual face of each tooth. Similarly, 24 measurement points will be defined on the posterior teeth at the cusp tips of each tooth. The average value of the dentures will be calculated for each of the 48 measurement points, and this will be used as the representative value of the measurement point.

Retention will be evaluated objectively by using digital force gauge that will be connected to a wire loop which is attached on the denture bases. This force will be measured in newtons (N) and recorded as the denture's retention. A total of 3 measurements will be made for each denture by the same investigator. The highest value will be recorded as the peak retention force and used for the analysis