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     <dc:title xml:lang="fr">Élaboration de biomatériaux à base de verres fluorés et borés : évaluations physico-chimique et mécanique</dc:title>
     <dcterms:alternative xml:lang="en">Elaboration of biomaterials based on fluor-glasses and boron-glasses : physico-chemical and mechanical evaluations</dcterms:alternative>
     <dc:subject xml:lang="fr">Verres bioactifs</dc:subject><dc:subject xml:lang="fr">verres boré</dc:subject><dc:subject xml:lang="fr">verres fluoré</dc:subject><dc:subject xml:lang="fr">caractéristique physico-chimique</dc:subject><dc:subject xml:lang="fr">comportement mécanique</dc:subject><dc:subject xml:lang="fr">SPS</dc:subject><dc:subject xml:lang="fr">réactivité chimique</dc:subject><dc:subject xml:lang="fr">hydroxyapatite</dc:subject>
     <dc:subject xml:lang="en">Bioactive glasses</dc:subject><dc:subject xml:lang="en">Boron-glasses</dc:subject><dc:subject xml:lang="en">Fluor-glasses</dc:subject><dc:subject xml:lang="en">physico-chemical characteristic</dc:subject><dc:subject xml:lang="en">mechanical behaviour</dc:subject><dc:subject xml:lang="en">SPS</dc:subject><dc:subject xml:lang="en">chemical reactivity</dc:subject><dc:subject xml:lang="en">hydroxyapatite</dc:subject><tef:sujetRameau><tef:vedetteRameauNomCommun>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="029873703">Bore</tef:elementdEntree><tef:subdivision autoriteSource="Sudoc" type="subdivisionDeForme" autoriteExterne="027253139">Thèses et écrits académiques</tef:subdivision>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027798046">Fluor</tef:elementdEntree><tef:subdivision autoriteSource="Sudoc" type="subdivisionDeForme" autoriteExterne="027253139">Thèses et écrits académiques</tef:subdivision>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="032724217">Hydroxyapatite</tef:elementdEntree><tef:subdivision autoriteSource="Sudoc" type="subdivisionDeForme" autoriteExterne="027253139">Thèses et écrits académiques</tef:subdivision>
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     <dcterms:abstract xml:lang="fr">Ce travail de thèse porte sur le développement  des nouveaux verres bioactifs de comblement osseux. Ils sont élaborés par fusion dans le système quaternaire : SiO2-CaO-Na2O-P2O5. Deux éléments chimiques (bore et fluor), ont été incorporés au sein du réseau vitreux. L’effet de la quantité des éléments ajoutés dans le verre, sur le comportement physico-chimique, mécanique et physiologique a été mené par plusieurs techniques originales. L’intégration du bore ou du fluor au sein de la matrice vitreuse, influe sur les caractéristiques thermiques des verres synthétisés. Les performances mécaniques en termes de résistance mécanique, module de Young, module de cisaillement, rigidité et dureté ont été développé par l’incorporation du fluor dans la structure vitreuse. L’effet inverse a été manifesté pour les verres à base du bore. Des essais ''in vitro'' ont prouvé que la présence du bore accélère la dissolution de la matrice vitreuse, la cinétique et la cristallisation de la couche d’hydroxyapatite. Tandis que l’ajout du fluor retarde ces phénomènes physiologiques.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">This thesis focuses on the development of new bioactive glasses for use as bone filling. They are synthetized by the melting method in the quaternary system CaO-SiO2-Na2O-P2O5. Two chemical elements (boron and fluor), have been incorporated in the glass network. The amount added effect, of elements, in the glass, on the physico-chemical, mechanical and physiological behaviour was led by several original techniques. The boron or fluor integration in the glass matrix, affect the thermal characteristics of the synthesized glasses. The mechanical performance in terms of: mechanical strength, Young's modulus, shear modulus, rigidity and hardness, have been developed by the fluor incorporation into the glass structure. The opposite effect was manifested for boron based glasses. In vitro tests have showed that the boron presence accelerates the vitreous matrix dissolution, the kinetics and the crystallization of the hydroxyapatite layer. While the fluor addition retards these physiological phenomena.</dcterms:abstract>
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