caa a22 4500 475782615 CHVBK 20180406123648.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1023/A:1008901512273 doi (NATIONALLICENCE)springer-10.1023/A:1008901512273 Dissolution behavior of plasma-sprayed hydroxyapatite coatings [Elektronische Daten] [F. Fazan, P. Marquis] The long-term stability of plasma-sprayed hydroxyapatite coatings is influenced by the dissolution behavior of the coating in in vivo conditions. Plasma-spraying generates a mixture of phases and this study has focused on how the balance of phases affects the in vitro dissolution behavior of the coatings in double distilled-deionized water and in tris-buffer solutions. The pH changes in double distilled-deionized water were monitored, whilst the pH value was maintained at 7.25 for the tris-buffer solution at 37 °C with 5% CO2atmosphere. The phosphate and calcium ions released were measured using UV-Visible Spectrophotometer and Atomic Absorption Spectroscopy respectively. Changes in crystal and surface topology were also studied. The results indicate that the dissolution behavior of the coatings depends on several factors. The rate of release of phosphate ions was found to increase significantly for the tris-buffer solution compared to the deionized water, indicating that the presence of electrolyte constituents affects the dissolution behavior of the coatings. The Ca/P ratio in the tris-buffer solution is approximately three. Increases in the level of crystallinity of the coatings significantly decreased the dissolution rate and hence, the amount of phosphate ions released. The higher the percentage of crystallinity, the higher the stability of the coating under in vitro conditions. Kluwer Academic Publishers, 2000 Fazan F. Biomaterials Unit, School of Dentistry, The University of Birmingham, St. Chad's Queensway, B4 6NN, Birmingham, UK aut Marquis P. Biomaterials Unit, School of Dentistry, The University of Birmingham, St. Chad's Queensway, B4 6NN, Birmingham, UK aut Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/12(2000-12-01), 787-792 0957-4530 11:12<787 2000 11 10856 https://doi.org/10.1023/A:1008901512273 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1008901512273 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fazan F. Biomaterials Unit, School of Dentistry, The University of Birmingham, St. Chad's Queensway, B4 6NN, Birmingham, UK aut NATIONALLICENCE 700 1- Marquis P. Biomaterials Unit, School of Dentistry, The University of Birmingham, St. Chad's Queensway, B4 6NN, Birmingham, UK aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/12(2000-12-01), 787-792 0957-4530 11:12<787 2000 11 10856 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer