ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty


EVALUATION OF SURFACE ROUGHNESS AND ELASTIC MODULUS IN CERAMIC AND RESIN COMPOSITE CAD/CAM MATERIALS DURING AGEING
 
Bai Yunyang 1,4,5, Yuan Shenpo 2, Wu Jiaqi 3
 
1 Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, People’s Republic of China
2 Department of Dental Materials & Dental Medical Devices Testing Center, Peking University School and Hospital of Stomatology, Beijing 100081, PR China
3 First Clinical Division, Peking University School and Hospital of Stomatology, Beijing 100034, People’s Republic of China
4 National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, PR China
5 Beijing Laboratory of Biomedical Materials, Peking University School and Hospital of Stomatology, Beijing 100081, PR China

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.


doi: 10.13168/cs.2020.0038
 
 
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