Ceramics-Silikáty 65, (1) 24 - 29 (2021)

Background and objectives: To evaluate and compare the surface roughness and elastic modulus in ceramic and resin composite CAD/CAM materials during thermal ageing. Materials and Methods: Four ceramic and resin composite CAD/CAM materials (Lava Ultimate HT and LT, VITA ENAMIC HT, and LT) were selected for this study. The specimens were treated with the aim of measuring the surface roughness and mechanical properties. Before and after the accelerated ageing protocol (5,000 cycles, 5°C and 55°C), the specimens were subjected to nanoindentation and a 3D profilometer. Results: The surface roughness of the Ultimate HT before and after ageing ranged from 118.48±12.87 to 123.42±10.68 nm without any statistically significant differences (p ˂ 0.05). The surface roughness of the Ultimate LT before and after ageing ranged from 90.18±10.57 to 96.91±6.28 nm without any statistically significant differences (p ˂ 0.05). The Ra of the ENAMIC HT before and after ageing ranged from 87.84±6.67 to 167.65±21.80 nm with statistically significant differences (p ˂ 0.05). The Ra of the ENAMIC LT before and after ageing ranged from 72.96±6.61 to 97.75±10.23 nm with statistically significant differences (p ˂ 0.05). The ENAMIC HT and LT had an elastic modulus nearly twice as much as the Ultimate HT and LT, respectively. Conclusions: The thermal ageing did not affect the elastic modulus. The thermal ageing increased the Ra in the ENAMIC HT and LT Group, but did not affect the Ra in the Ultimate HT and LT Group.