Tribology and Materials | Volume 1 | Issue 2 | 2022 | 55-60


https://doi.org/10.46793/tribomat.2022.010

Surface roughness evaluation of different novel CAD/CAM dental materials

Stefan Vulović, Ivica Stančić, Aleksandra Popovac, Aleksandra Milić-Lemić

University of Belgrade, School of Dental Medicine, Belgrade, Serbia

 

Abstract: The aim of the study was to evaluate and compare surface roughness among different CAD/CAM dental materials when all materials are finished and polished according to the manufacturer's instructions. The 45 specimens were split into three groups: RBC (resin-based composite), ZR (zirconia) and CoCr4 (CoCr4 alloy). The surface roughness was evaluated using a mechanical profilometer, atomic force microscopy (AFM) and scanning electron microscopy (SEM) analyses. The data were analysed using the Kruskal-Wallis test with a Dunn's post hoc analysis and all data were presented as mean SD. Surface roughness analysis on a microscale (μm) revealed significantly higher Ra (μm) mean values in the ZR group compared to RBC and (p < 0.05) and CoCr4 group (p < 0.05), between which no statistically significant difference was observed (p > 0.05). Surface roughness analysis on a nanoscale (nm) has shown the opposite results, with the lowest values in the ZR group and statistically significant differences among all material groups (p < 0.05). AFM 3D and SEM 2D images revealed heterogeneous surface morphology for all groups.

Keywords: surface roughness, profilometer, SEM, AFM, composite, zirconia, CoCr.

Received: 07-06-2022, Revised: 24-06-2022, Accepted: 24-06-2022

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