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Crystallization process of carbonate substituted hydroxyapatite nanoparticles in toothpastes upon physiological conditions: an in situ time-resolved X-ray diffraction study

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Abstract

The crystallization process in recently developed toothpastes, containing nanoparticles of carbonate substituted hydroxyapatite (nano-CHA), was investigated. For this purpose, the non-conventional Energy Dispersive X-Ray Diffraction technique, that demonstrated to be a powerful tool to follow in situ phase transformations, was applied, for the first time, to products of pharmaceutical-cosmetic interest. Two types of toothpastes, containing 15 and 20 wt% of nano-CHA, respectively, have been studied. It was observed that, after mixing the toothpastes with water and saliva in order to reproduce in vivo conditions, a crystallization of nano-CHA takes place. Such process occurs in a characteristic time of (22 ± 1) min for the toothpaste containing 15 wt% of nano-CHA and of (3.9 ± 0.5) min for the one containing 20% of nano-CHA. For both toothpastes, a 10% increase in grain dimensions was observed over an average characteristic time of (55 ± 5) min.

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Authors and Affiliations

  1. Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Via del Fosso del Cavaliere, 100-00133, Rome, Italy

    A. Generosi, J. V. Rau, V. Rossi Albertini & B. Paci

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  1. A. Generosi
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  2. J. V. Rau
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  3. V. Rossi Albertini
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  4. B. Paci
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Correspondence to J. V. Rau.

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Generosi, A., Rau, J.V., Rossi Albertini, V. et al. Crystallization process of carbonate substituted hydroxyapatite nanoparticles in toothpastes upon physiological conditions: an in situ time-resolved X-ray diffraction study. J Mater Sci: Mater Med 21, 445–450 (2010). https://doi.org/10.1007/s10856-009-3905-z

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  • DOI: https://doi.org/10.1007/s10856-009-3905-z

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