Abstract
Electron spin resonance (ESR) is a spectroscopic technique that detects unpaired electrons, such as the ones present in free radicals. When a calcified tissue is irradiated, free radicals are generated, like the CO2−. This paper presents a preliminary study on the application of this spectroscopic technique for monitoring bone mineralization processes during the bone repair in animal model, induced by polyurethane in two forms, as an occlusive membrane and as a bone grafting. In the first experiment, the ESR results and microscopic analysis demonstrate centripetal bone growth and advanced stage of bone regeneration in the treated group. In the second experiment, the ESR spectrum of collected bone pieces presents the superposition of the spectrum of the biomaterial and the radical CO2−. The separation of the components was made using spectral simulation, and the percentage of mature bone tissue in the defect region was determined through the comparison with the spectrum of the native bone. In both experiments, ESR provided results consistent with microscopic analysis, demonstrating the feasibility of the technique for monitoring bone regeneration.
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Acknowledgements
The authors are grateful to Professor Sergio Mascarenhas to whom we dedicate this article and who, through his pioneering work in the 1970s on physical aspects of hard tissues, such as bones and teeth, which resulted in several articles, theses and dissertations, drew attention to this area of interdisciplinary research.
Funding
This work received funding from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Grants 03/09505–6, 07/06720–4 & 2013/07699–0, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Grants 304107/2019–0 and 309186/2020–0 and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) código 001.
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The authors declare that they have no conflict of interest with any organization regarding the material discussed in this manuscript. This work was partially supported by the research funding agencies as mentioned and it was conducted in accordance with ethical academic standards and also respecting ethical guidance for animal studies. The preliminary version of this work was presented at the 18th International Conference on Medical Physics (April 17-20, 2011 Porto Alegre - RS - Brazil) and an abstract was published.
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Blasioli, G.J., Silva, L.H.P., Holgado, L.A. et al. Application of Electron Spin Resonance Spectroscopy in Bone Regeneration Studies. Braz J Phys 52, 51 (2022). https://doi.org/10.1007/s13538-022-01060-4
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DOI: https://doi.org/10.1007/s13538-022-01060-4