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Conception et développement d’une nouvelle famille d’alliages de titane à haute résistance mécanique et biocompatibilité optimisée pour l’implantologie dentaire.

Abstract : This study deals with the development of new titanium alloys for dental implant applications and has been carried out in collaboration with the company Biotech Dental. The Ti-6Al-4V or Ti64, one of the top-selling material in this field, is more and more criticized due to its chemical composition, suspected of having harmful impacts on the patients (on account of Al and V). In order to find a substitute to this material, a new Ti-xZr-yO family, entirely biocompatible, is developed. Having seemingly a single-phase microstructure, these materials prove to be more complex at the atomic scale and present oxygen-rich nano-precipitates with a Ti6O-type crystal structure. The existence of this phase had been predicted by ab-initio calculations and some physical evidences had been detected but this work is the first one to expose some images of it, taken by transmission electron microscope. These observations combined to a synchrotron XRD study reveal a stabilising effect of the zirconium on the Ti6O phase. The increase in oxygen content seem, however, to induce a multiplication of the precipitates. Furthermore, the contribution of the latter to the TiZrO alloys hardening is found to be significant, mostly because of their strong interaction with the moving dislocations under a mechanical stress. The resulting mechanical properties overcome the strength/ductility trade-off, generally observed in most materials. Moreover, several grades of TiZrO alloys are considered as serious candidates to the replacement of Ti64 due to their healthier components and their superior mechanical properties. These results have led to a patent deposit to protect the composition range of the alloy family on the one hand and to a higher scale industrialisation of one alloy on the other, thus targeting a short-term new osseo-integrated implants launching.
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https://pastel.archives-ouvertes.fr/tel-03648503
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Submitted on : Thursday, April 21, 2022 - 4:04:10 PM
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Régis Poulain. Conception et développement d’une nouvelle famille d’alliages de titane à haute résistance mécanique et biocompatibilité optimisée pour l’implantologie dentaire.. Chimie théorique et/ou physique. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLC026⟩. ⟨tel-03648503⟩

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