Abstract
This study was performed to evaluate the effects of a diamond-like carbon (DLC) layer on the biological properties of a pre-treated titanium dioxide (TiO2) coronary stent surface. TiO2 and DLC were coated onto a cobalt-chromium stent surface in consecutive order using the plasma-enhanced chemical vapor deposition method (TiO2/DLC). To investigate the effect of TiO2, a group treated only with DLC was also prepared as a control. The surface characteristics were investigated by SEM, ESCA, AFM, and contact angle analyses. To estimate the effect of surface modification on biological response, endothelial cell migration was carried out. As a result, cracking of the coating layer on the strut curved portion in the DLC group was restored in the TiO2/DLC group. ESCA result showed that the peaks sp2 and sp3 were slightly shifted and higher in the TiO2/DLC group. The surface roughness average was highly increased in the TiO2/DLC group (Ra; 18.033) compared to the BMS (Ra; 9.258) and DLC groups (Ra; 10.144). By the increment of Ra, the surface property became hydrophilic in the TiO2/DLC group (39.8° ± 5.88°) compared to the non-treated (72.7° ± 2.24°) and DLC (78.6° ± 2.24°) groups. Endothelial cell migration was significantly increased in the TiO2/DLC group (68.9 ± 13.52%) compared to the non-treated (5.4 ± 3.14%) and DLC groups (22.3 ± 8.22%). Therefore, the improvement of surface properties and endothelial cell migration in the TiO2/DLC group could improve the physiological response in the human body.
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This study was supported by a Grant from the Korean Health Technology R&D Project (HI13C1527) and the Korea Health Industry Development Institute (KHIDI) (HI17C0471), funded by the Ministry of Health and Welfare, Republic of Korea.
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Shim, J.W., Bae, IH., Jeong, M.H. et al. Effects of a Titanium Dioxide Thin Film for Improving the Biocompatibility of Diamond-Like Coated Coronary Stents. Met. Mater. Int. 26, 1455–1462 (2020). https://doi.org/10.1007/s12540-019-00424-x
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DOI: https://doi.org/10.1007/s12540-019-00424-x