Calcium orthophosphates constitute a materials family often suggested as ideal materials to treat and substitute hard tissues. The most employed structure for these intentions is the hydroxyapatite [Ca10(PO4)6(OH)2, HA] and the tricalcium phosphate [Ca3(PO4)2, B-TCP]. In the last years, exist a great interest to use multifunctional materials in many research fields. In this sense, the calcium orthophosphates are regarded as promising materials, since their structures have some characteristics such as the facility to accept partial and total ionic substitutions, the biocompatibility and biodegradability. All these peculiarities allows the function flexibility for these structures. In this way, the present work aims to explore these peculiarities and to demonstrate the multifunctionality of these systems in three different work lines. The first one consist in the preparation of nanoparticles able to biomimetize the bioapatite nanoparticles present in the dental enamel, throught a exhaustive study of the synthesis parameters in the chemical precipitation methodology. The second line will study systems of hydroxyapatite doped with lanthanide ions with luminescent properties, verifying how different thermal treatments affects the crystallographic and simmetry preferences of these species into the structure. The last line aims to sintesize and to study solid solutions in the ternary system Ca3(PO4)2-Sr3(PO4)2-Cu(PO4)2. In this part of the work, an emphasis will be done on the cromatic and antimicrobial properties of Cu(II) and the influence of Ca(II) and Sr(II) in these properties.
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