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<dc:title xml:lang="fr">Caractérisation de biocéramiques et évaluation de leurs potentiels bioactifs</dc:title>
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<dc:subject xml:lang="fr">Polyphénols</dc:subject>
<dc:subject xml:lang="fr">"Mineral trioxide aggregate"</dc:subject>
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<dc:subject xml:lang="en">Mineral trioxide aggregate</dc:subject>
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<dcterms:abstract xml:lang="fr">La ligne directrice de ce travail de thèse consiste à rajouter des polyphénols dans l’eau utilisée pour la prise du ciment dentaire de réparation canalaire dans l’hypothèse que cette famille de molécules, connues pour leur capacité à s’adsorber sur la surface de tous types de matériaux, favorise des interactions interparticules au sein du ciment et qu’une partie reste disponible pour favoriser des effets biologiques. L'ajout d’acide tannique (AT) aux ciments « mineral trioxide aggregate » (MTA) diminue nettement leur temps de prise et la taille moyenne des grains du ciment obtenus et augmente l'hydrophilie des matériaux composites ainsi que leur propriétés mécaniques à l'état sec. Mais le fait que le polyphénol est fortement hydrophile avec une certaine libération dans l'eau, induit une diminution de la compression maximale à la rupture des composites dopés avec de l’AT par rapport au ciment MTA 100% hydraté. Pour mieux comprendre les effets de l’addition de polyphénols sur les propriétés de ce matériau, la modification du plâtre de Paris avec différentes fractions massiques d’acide tannique et de pyrogallol a été étudiée. L’incorporation de molécules actives dans des composites à base de calcium pourrait avoir un effet positif sur leurs propriétés mécaniques et leurs activités biologiques. Mais des études complémentaires restent à mener avec d’autres polyphénols et d’autres matériaux composites.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The guideline of this thesis is to add polyphenols to the liquid used for the setting of dental root canal repair cements with the assumption that this family of molecules, known for their ability to adsorb on the surface of all types of materials, promote interparticle interactions within the cement and a part remains available to promote biological effects. The addition of tannic acid (TA) to mineral trioxide aggregate (MTA) cements decreases their setting time, reduces the average grain size and increases the hydrophilicity of the composite materials as well as their mechanical properties in the dry state. But the fact that the polyphenol is strongly hydrophilic with a certain release in water, induces a decrease of the compression resistance at break of the composites doped with TA compared to the 100% hydrated MTA cement. To better understand the effects of polyphenol addition on the properties of this material, the modification of plaster of Paris with different mass fractions of tannic acid and pyrogallol was also studied. The incorporation of active molecules in calcium-based composites could have a positive effect on their mechanical and biological properties. But further studies are still needed with other polyphenols and other composite materials.</dcterms:abstract>
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