A physical approach to modify the hydraulic reactivity of α-tricalcium phosphate powder |
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| Authors: | Marc Bohner, Reto Luginbü hl, Christian Reber, Nicola Doebelin, Gamal Baroud,Egle Conforto |
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| Affiliation: | 1. RMS Foundation, Bischmattstrasse 12, P.O. Box 203, CH-2544 Bettlach, Switzerland;2. Département de Chimie, Université de Montreal, Montréal, Que., Canada H3C 3J7;3. Laboratoire de Biomécanique, Département de Génie, Université de Sherbrooke, Sherbrooke, Que., Canada J1K 2R1;4. Fédération de Recherche en Environnement pour le Développement Durable (FR-EDD), FR CNRS 3097, Centre Commun d’Analyses, 5 Allées de l’Océan, F-17071 La Rochelle Cedex 9, France;1. GeoZentrum Nordbayern – Mineralogy, Friedrich-Alexander-University of Erlangen-Nuremberg, Schlossgarten 5, 91054 Erlangen, Germany;2. RMS Foundation, Bischmattstrasse 12, CH-2544 Bettlach, Switzerland;1. LCPME, Université de Lorraine CNRS UMR 7564, 405 rue de Vandoeuvre 54600 Villers Lès Nancy, France;2. Graftys SARL Eiffel Park bâtiment D, 415 rue Claude Nicolas Ledoux, pôle d’activités d’Aix en Provence, 13854 Aix en Provence Cedex 3, France;3. CEISAM, Université de Nantes CNRS UMR 6230, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 03, France;4. CEMHTI, CNRS, UPR 3079, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 02, France;5. Université d’Orléans, Faculté des Sciences, Avenue du Parc Floral, 45067 Orléans Cedex 02, France;6. LIOAD, Université de Nantes, INSERM UMR 791, Faculté de chirurgie dentaire, BP 84215, 44042 Nantes Cedex 1, France;1. Biomaterials, Biomechanics and Tissue Engineering Group, Department of Materials Science and Metallurgical Engineering, Universitat Politècnica de Catalunya, BarcelonaTech (UPC), Av. Diagonal 647, 08028 Barcelona, Spain;2. Institute for Bioengineering of Catalonia, C. Baldiri Reixach 10, 08028 Barcelona, Spain;1. GeoZentrum Nordbayern – Mineralogy, Friedrich-Alexander-University of Erlangen-Nuremberg, Schlossgarten 5, 91054 Erlangen, Germany;2. RMS Foundation, Bischmattstrasse 12, CH-2544 Bettlach, Switzerland;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China;2. National Engineering Research Center for Tissue Restoration and Reconstruction, Guangzhou 510006, China |
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| Abstract: | ![]()
A microsized α-tricalcium phosphate (α-TCP) powder was calcined at various temperatures (350 °C < T < 800 °C) for various durations (1–24 h) and the resulting physico-chemical and reactivity changes were measured. Without calcination, the α-TCP powder started reacting within minutes after contacting a 0.2 M Na2HPO4 solution as measured by isothermal calorimetry. The overall reaction was finished within a few days. After calcination at 350 °C  T 550 °C for 24 h, no significant changes in the crystalline composition, crystallite size, particle size or specific surface area were noticed. However, the powder reactivity was progressively changed. More specifically, the hydraulic reaction of the powders calcined at 500 and 550 °C only started after 2–3 h whereas the overall hydraulic reaction was only slightly postponed, suggesting that physical or chemical changes had occurred at the particle surface. As mainly physical changes were detected at the particle surface during calcination at 500 °C, it was speculated that the appearance of this reaction delay (= induction time) was due to the disappearance of surface defects during the calcination step, i.e. to the need to create surface defects to induce dissolution and hence reaction. |
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| Keywords: | α -Tricalcium phosphate Biomaterials Hydroxyapatite Isothermal calorimetry Calcium phosphate cement |
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