In vitro bioactivity, molecular structure and mechanical properties of zirconia-carbonated hydroxyapatite nanobiocomposites sintered at different temperatures
2019; Elsevier BV; Volume: 239; Linguagem: Inglês
10.1016/j.matchemphys.2019.122011
ISSN1879-3312
AutoresRasha A. Youness, Mohammed A. Taha, Medhat Ibrahim,
Tópico(s)Dental Implant Techniques and Outcomes
ResumoZirconia-carbonated hydroxyapatite (ZrO2-CHA) nanocomposites powders, with various CHA contents, have been prepared using high energy ball milling. In order to investigate the influence of their exposure to different firing temperatures; namely 800, 1000, 1200, 1400 and 1500 °C on their molecular structure and microstructure, X-ray diffraction (XRD) technique, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), respectively were employed. Additionally, their mechanical properties were also measured. Then, the in vitro bioactivity of the sintered samples, at different temperatures, was examined by FTIR spectroscopy and SEM after their soaking in simulated body fluid for 10 days. The obtained results pointed out that the elevation of sintering temperatures to 1000 °C caused fair densification and good mechanical properties irrespective to the partial degenartion of CHA and the formation of tricalcium phosphate (TCP) and calcium zirconate (CaZrO3) phases. However, further increase of sintering temperature led to dramatic decreases in these properties and then, they were significantly enhanced by the increasing of sintering temperature up to 1500 °C. The formation of the abovementioned phases negatively affected the bioactivity of these nanocomposites. Calculated molecular electrostatic potential confirmed the reactivity of TCP and CaZrO3 phases.
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