



@article {2619,
	title = {Characterization of apatite layer formation on P                    2O
                    5-CaO, P
                    2O
                    5-CaO- Na
                    2O, and P
                    2O
                    5-CaO-Na
                    },
	journal = {Journal of Biomedical Materials ResearchJ. BIOMED. MATER. RES.},
	volume = {31},
	year = {1996},
	note = {Cited By (since 1996): 20Export Date: 21 November 2012Source: ScopusCODEN: JBMRBdoi: 10.1002/(SICI)1097-4636(199608)31:4<481::AID-JBM7>3.0.CO;2-HPubMed ID: 8836844Language of Original Document: EnglishCorrespondence Address: Jha, L.J.; IRC in Biomedical Materials, Queen Mary and Westfield College, Mile End Road, London E1 4NS, United KingdomChemicals/CAS: HydroxyapatitesReferences: Hyakuna, K., Yamamuro, T., Kotoura, Y., Oka, M., Kokubo, T., Kushitani, H., Surface reactions of calcium phosphate ceramics to various solutions (1990) J. Biomed. Mater. Res., 24, pp. 471-488;Ebisawa, Y., Kokubo, T., Ohura, K., Yamamuro, T., Bioactivity of CaO{\textperiodcentered}SiO 2-based glasses: In vitro evaluation (1990) J. Mater. Sci.: Mater. Med., 1, pp. 239-244; 
Kokubo, T., Kushitani, H., Ohtsuki, C., Sakka, S., Yamamuro, T., Chemical reaction of bioactive glass and glass ceramics with a simulated body fluid (1992) J. Mater. Sci.: Mater. Med., 3, pp. 79-83; 
Li, P., Yang, Q., Zhang, F., Kokubo, T., The effect of residual glassy phase in a bioactive glass-ceramic on the formation of its surface apatite layer in vitro (1992) J. Mater. Sci.: Mater. Med., 3, pp. 452-456; 
Ohtsuki, C., Aoki, Y., Kokubo, T., Yamamuro, T., Nakamura, T., Characterization of apatite layer formed on bioactive glass-ceramic A-W (1992) Bioceramics, 5, pp. 87-94. , T. Yamamuro, T. Kokubo, and T. Nakamura (eds.), Kokunshi Kankokai, Japan; 
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Kohri, M., Miki, K., Waite, D., Nakajima, H., Okabe, T., In vitro stability of biphasic calcium phosphate ceramics (1993) Biomaterials, 14, pp. 299-304; 
Andersson, O.H., Kangasniemi, I., Calcium phosphate formation at the surface of bioactive glass in vitro (1991) J. Biomed. Mater. Res., 25, pp. 1019-1030; 
Kokubo, T., Kushitani, H., Sakka, S., Kitsugi, T., Yamamuro, T., Solutions able to reproduce in vivo surface-structure changes in bioactive glass-ceramic A-W (1990) J. Biomed. Mater. Res., 24, pp. 721-734; 
Santos, J.D., Knowles, J.C., Hastings, G.W., Bonfield, W., "Sintered hydroxyapatite compositions and method for the preparation thereof," British Patent No. 9,213,774.4 (1993)Santos, J.D., Reis, R.L., Knowles, J.C., Hastings, G.W., Monteiro, F.J., Microstructural characterisation of glass-reinforced hydroxyapatite composites (1994) Biomaterials, 15, pp. 5-10; 
Santos, J.D., Knowles, J.C., Monteiro, F.J., Hastings, G.W., Development of a glass reinforced hydroxyapatite with enhanced mechanical properties: Physical properties and in vitro studies (1992) Bioceramics, 5, pp. 35-41. , T. Yamamuro, T. Kokubo, and T. Nakamura (eds.), Kokunshi Kankokai, Japan; 
Knowles, J.C., Abrahams, I., Bonfield, W., Effect of reinforcing glass composition on phase transformation and crystallographic parameters in hydroxyapatite (1993) Bioceramics, 6, pp. 191-196. , P. Ducheyne and D. Christiansen (eds.), Butterworth Heinemann, New York; 
Knowles, J.C., Bonfield, W., Development of a glass reinforced hydroxyapatite with enhanced mechanical properties. The effect of glass composition on mechanical properties and its relationship to phase changes (1993) J. Biomed. Mater. Res., 27, pp. 1591-1598; 
Burnie, J., Gilchrist, T., Controlled release glass (C.R.C.) - A new biomaterial (1983) Ceramics in Surgery, pp. 169-176. , P. Vincenzini (ed.), Elsevier, Amsterdam; 
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},
	month = {1996///},
	pages = {481 - 486},
	publisher = {John Wiley \& Sons Inc},
	abstract = {P                        2O
                        5-based glass hydroxyapatite (HA) composites denoted HA-2 oxide, HA-3 oxide, and HA-4 oxide, were immersed in Hank{\textquoteright}s balanced salt solution for a period of 1, 2, 3, and 4 weeks at 37{\textdegree}C in nonagitated condition for in vitro evaluation. A surface layer was precipitated on the composites that was analyzed using scanning electron microscopy (SEM), X-ray photoelecton spectroscopy, and thin film X-ray diffractometry (TF-XRD). SEM micrographs showed complete coverage of the composite surface by crystallites after immersion of 1 week in the solution, which grew thicker with respect to immersion time. The binding energies measured by XPS indicated apatite formation and the presence of carbonate on the composite surface, showing the newly formed layer was a carbonated apatite. Confirmation of the formed apatite layer was obtained by TF-XRD.
                        2O
                        5-based glass hydroxyapatite (HA) composites denoted HA-2 oxide, HA-3 oxide, and HA-4 oxide, were immersed in Hank{\textquoteright}s balanced salt solution for a period of 1, 2, 3, and 4 weeks at 37{\textdegree}C in nonagitated condition for in vitro evaluation. A surface layer was precipitated on the composites that was analyzed using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy, and thin film X-ray diffractometry (TF-XRD). SEM micrographs showed complete coverage of the composite surface by crystallites after immersion of 1 week in the solution, which grew thicker with respect to immersion time. The binding energies measured by XPS indicated apatite formation and the presence of carbonate on the composite surface, showing the newly formed layer was a carbonated apatite. Confirmation of the formed apatite layer was obtained by TF-XRD.
},
	keywords = {Apatite, article, binding affinity, Biomaterials, bone strength, Calcium Compounds, Carbonates, Ceramic materials, Characterization, chemical composition, Composite materials, Crystallites, electron microscopy, glass, Glass hydroxyapatite composites, Hank balanced salt solution, hydroxyapatite, Hydroxyapatites, immersion, Microscopy, Electron, Scanning, Molecular Structure, Oxides, prosthesis material, Scanning electron microscopy, scanning tunneling microscopy, Spectrum Analysis, Thin film X ray diffractometry, Thin films, X ray diffraction, X ray diffraction analysis, X ray photoelectron spectroscopy, X-Ray Diffraction},
	isbn = {00219304 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030222031\&partnerID=40\&md5=1cba84bf7d0e93a4e3a3808849398c78},
	author = {Jha, L.J. and Santos, J.D. and Knowles, J.C.}
}
