Impact of Fabrication Techniques and Polishing Procedures on Surface Roughness of Denture Base Resins

In this study, we aim to evaluate the effects of manufacturing and polishing techniques on the surface roughness of resin materials used in the production of dental processes. We determined that mechanical polishing up to a thousand grid significantly reduces surface roughness in three dimensional printed materials, but does not issue clinically acceptable roughness. Future studies will be planned to expand the variety of polishing techniques applied and to reduce the surface roughness of prosthetic basis fabricated using three dimensional printed materials.

[Instructor] To begin, produce polymethyl methacrylate resin discs using a suitable method. For calibration press and hold the power button to turn on the profilometer device. Once the main screen appears, press the start button. Open the calibration panel without touching the gray area and position it under the scanner tip with the text facing the user. Press the menu enter button on the control panel to initiate calibration. Select the calib measurement option and press the start button. Adjust the settings for surface roughness readout to cover 0.5 millimeters with a cutoff value of 0.8 millimeters at a speed of 0.25 millimeters per second and a resolution of 0.01 micrometers. For surface roughness measurement, place the sample on the panel so that its surface touches the scanner tip. Once the scanner tip completes the surface scan, save the numerical data displayed on the screen to an Excel file. Before the polishing procedure, the surface roughness values were significantly different between the groups. After the polishing procedure, the surface roughness values decreased in all groups. The box plot demonstrated the disparities in surface roughness of the samples prior to and following polishing of heat polymerized, 3D printed and milled discs. The 3D printed group demonstrates the most considerable variation and median discrepancy in surface roughness, whereas the milled group exhibits the smallest difference with the presence of some outliers. Post polishing, no statistically significant difference was observed between the heat polymerized and CAD-CAM Milled groups.