Department of Materials Science and Engineering, Chosun University, Gwagju 61452, South Korea.
J Nanosci Nanotechnol. 2021 Aug 1;21(8):4157-4163. doi: 10.1166/jnn.2021.19374.
Zirconia dental implants require excellent biocompatibility and high bonding strength. In this study, we attempted to fabricate biocompatible zirconia ceramics through surface modification by hydroxyapatite (HA) slurry coating. A hydroxyapatite slurry for spin coating was prepared using two sizes of hydroxyapatite particles. The hydroxyapatite slurry was obtained by adjusting the solid loading, pH range, and dispersant content. The surface roughness of the HA-coated layers on the zirconia substrate depended on the change in microstructural evolution and coating thickness. With repeated coating, the coating thickness gradually increased for both small and large particles. The specimen with two coatings had the maximum surface roughness but displayed different values depending on the size of the HA particles. High surface roughness (Ra; 0.49 m) could be obtained from the slurry of small particles compared with that of the large particles (Ra; 0.35 m). During a 14 days experiment in SBF solution at pH 7.4, no changes were observed in the surface microstructure of the HA coating layer on the zirconia substrate.
氧化锆牙科种植体需要优异的生物相容性和高结合强度。在这项研究中，我们试图通过羟基磷灰石（HA）浆料涂层的表面改性来制造生物相容性氧化锆陶瓷。使用两种大小的羟基磷灰石颗粒制备了用于旋涂的羟基磷灰石浆料。通过调整固含量、pH 范围和分散剂含量来获得羟基磷灰石浆料。HA 涂层在氧化锆基底上的表面粗糙度取决于微观结构演变和涂层厚度的变化。随着重复涂层，两种颗粒的涂层厚度逐渐增加。具有两层涂层的样品具有最大的表面粗糙度，但由于 HA 颗粒的大小不同，表面粗糙度值也不同。与大颗粒相比（Ra；0.35 m），小颗粒的浆料可获得更高的表面粗糙度（Ra；0.49 m）。在 pH 值为 7.4 的 SBF 溶液中进行的 14 天实验中，观察到氧化锆基底上的 HA 涂层表面微观结构没有变化。
