Wollastonite nanofiber–doped self-setting calcium phosphate bioactive cement for bone tissue regeneration

H Guo, J Wei, W Song, S Zhang, Y Yan… - International Journal of …, 2012 - Taylor & Francis
H Guo, J Wei, W Song, S Zhang, Y Yan, C Liu, T Xiao
International Journal of Nanomedicine, 2012Taylor & Francis
The purpose of this study was to synthesize a self-setting bioactive cement by incorporation
of wollastonite nanofibers (WNFs) into calcium phosphate cement (CPC). The composition,
morphology, setting time, compressive strength, hydrophilicity, and degradation of WNF-
doped CPC (wnf-CPC) were investigated. Scanning electron microscopy, Fourier transform
infrared spectroscopy, X-ray diffraction, and inductively coupled plasma atomic emission
spectroscopy were utilized. Additionally, methyl-thiazolyl-tetrazolium bromide assay …
The purpose of this study was to synthesize a self-setting bioactive cement by incorporation of wollastonite nanofibers (WNFs) into calcium phosphate cement (CPC). The composition, morphology, setting time, compressive strength, hydrophilicity, and degradation of WNF-doped CPC (wnf-CPC) were investigated. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and inductively coupled plasma atomic emission spectroscopy were utilized. Additionally, methyl-thiazolyl-tetrazolium bromide assay, scanning electron microscopy, inductively coupled plasma atomic emission spectroscopy, and histological evaluation were used to study the cell and tissue responses to wnf-CPC, both in vitro and in vivo. The results confirmed that the addition of WNFs into CPC had no obvious effect on the setting time or the compressive strength of wnf-CPC, provided the WNF amount was not more than 10 wt%. However, the hydrophilicity and degradability of wnf-CPC were significantly improved by the addition of WNFs – this was because of the change of microstructure caused by the WNFs. The preferred dissolution of WNFs caused the formation of microporosity in wnf-CPC when soaked in tris hydrochloride solution. The microporosity enlarged the surface area of the wnf-CPC and so promoted degradation of the wnf-CPC when in contact with liquid. In addition, MG-63 cell attachment and proliferation on the wnf-CPC were superior to that on the CPC, indicating that incorporation of WNFs into CPC improved the biological properties for wnf-CPC. Following the implantation of wnf-CPC into bone defects of rabbits, histological evaluation showed that wnf-CPC enhanced the efficiency of new bone formation in comparison with CPC, indicating excellent biocompatibility and osteogenesis of wnf-CPC. In conclusion, wnf-CPC exhibited promising prospects in bone regeneration.
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