In Vivo Evaluation of Strontium-Containing Nanostructured Carbonated Hydroxyapatite

Abstract:

Bone tissue is a composite material that has hydroxyapatite (HA) as its main inorganic phase component. The biological apatites have low crystallinity and contain cationic and anionic substitutions in their structure, which differ from the available synthetic ceramics. The purpose of this study is to evaluate the biocompatibility of nanostructured carbonated hydroxyapatite microspheres containing 5 wt% strontium (SrcHA) compared with the biocompatibility of carbonated hydroxyapatite (cHA), both synthesized at 37°C and non-sintered, used to control stoichiometric HA microspheres in subcutaneous tissue of mice. The biomaterials (BM) were characterized using X-ray Diffraction (XRD), Vibrational Spectroscopy in an Infrared Fourier Transform (VSIRFT) and Scanning Electron Microscopy (SEM). Forty five balb-C mice were randomly divided into four groups of 15 animals each: SrcHA, cHA, HA, and without material implantation (Sham group). All samples were histologically processed for descriptive evaluation of the biological effect. At each experimental period (1, 3 and 9 weeks), there was a higher biosorption of the tested biomaterials observed in contrast with the HA. The cHA group was the only group completely phagocytosed by macrophages and giant cells after 9 weeks. All biomaterials proved to be biocompatible, and the cHA and SrcHA 3% groups exhibited a faster bioabsorption in comparison with the control group. The doping of strontium did not cause a greater biological response after the 3 experimental periods.

• Periodical: Key Engineering Materials (Volume 696)
• Pages: 212-222
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.696.212
• Online since: May 2016
• Authors: Gabriel Maia Kammer, Suelen Cristina Sartoretto, Rodrigo Resende, Marcelo Uzeda, Jhonathan Raphael Nascimento, Adriana Terezinha Alves, Jose Calasans-Maia, Alexandre Malta Rossi, J.M. Granjeiro, Mônica Diuana Calasans-Maia*
• Keywords: Carbonated Hydroxyapatite, Mice, Nanotechnology, Strontium, Subcutaneous

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