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Enhanced Osteogenesis of Nanosized Cobalt-substituted Hydroxyapatite

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Abstract

Hydroxyapatite (HAp) is an extensively studied material with known biocompatible and osteoconductive properties in bone tissue reconstruction. The improvement of the osteogenetic potential of HAp has been tested through modification of its structure, by replacing Ca2+ ions with Co2+ ions. In our study, we comparatively analyze the osteogenetic potential of the synthesized HAp and Co2+-substituted HAp (HAp/Co) designed on the nano-scale with the aim of specifically stimulating osteogenesis in vivo. We present a quantitative study of the microscopic organization and structure of the newly formed tissue in a bone defect after 12 weeks and 24 weeks. A quantitative analysis of the calcium, magnesium and phosphorus content in the defect and its close environment was used to determine the deposition of minerals after bone reconstruction. The defect reconstructed with HAp/Co nanoparticles (Co2+ content 12 wt%) was filled with a new tissue matrix composed of dense collagen fibers containing centers of mineralization after 24 weeks. The mineral deposition rate was also higher when the defect was reconstructed with HAp/Co than when it was filled with pure HAp. A histological analysis confirmed that the alveolar bone, in which osteoporosis-induced defects were repaired using HAp/Co nanoparticles, was recuperated.

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Authors and Affiliations

  1. Centre for Fine Particles Processing and Nanotechnologies, Institute of Technical Sciences of the Serbian Academy of Science and Arts, Knez Mihailova 35/4, 11000, Belgrade, Serbia

    Nenad Ignjatović & Dragan Uskoković

  2. Faculty of Medicine, Department of Prosthodontics, Clinic of Stomatology, University of Niš, Niš, Serbia

    Zorica Ajduković

  3. Department of Biology and Ecology Faculty of Science and Mathematics, University of Niš, Niš, Serbia

    Jelena Rajković & Stevo Najman

  4. Faculty of Medicine, Institute of Pathology, University of Niš, Niš, Serbia

    Dragan Mihailović

Authors
  1. Nenad Ignjatović
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  2. Zorica Ajduković
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  3. Jelena Rajković
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  4. Stevo Najman
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  5. Dragan Mihailović
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  6. Dragan Uskoković
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Correspondence to Dragan Uskoković.

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Ignjatović, N., Ajduković, Z., Rajković, J. et al. Enhanced Osteogenesis of Nanosized Cobalt-substituted Hydroxyapatite. J Bionic Eng 12, 604–612 (2015). https://doi.org/10.1016/S1672-6529(14)60150-5

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  • DOI: https://doi.org/10.1016/S1672-6529(14)60150-5

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