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<dc:title xml:lang="fr">Développement d’une vis d’interférence par impression 3D pour la fixation des greffes de reconstruction ligamentaire-preuve de concept de la stimulation de la microvascularisation par VEGF au contact de l’implant</dc:title>
<dcterms:alternative xml:lang="en">Development of a 3D-printed interference screw for fixation of ligament reconstruction grafts-proof of concept of VEGF microvascularization stimulation at implant contact</dcterms:alternative>
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<dcterms:abstract xml:lang="fr">La médecine régénérative a connu une expansion considérable dans les dernières decennies et le développement de l’impression 3D permet la fabrication d’implants innovants. Notre premier objectif était de produire une vis d’interférence en PLA par impression 3D. Les vis ont été soumises à des tests mécaniques pour établir leurs caractéristiques de résistance en torsion et en traction sur un modèle de reconstruction du ligament croisé antérieur. Notre second objectif était de promouvoir la formation de structures vasculaires au contact de pastilles de PLA par l’adjonction de nanoreservoirs contenant du VEGF. La promotion de la vascularisation pourrait être un facteur d’ostéointégration des greffes de reconstruction. Les résultats des tests mécaniques montrent une différence en termes de résistance à la torsion maximale tandis que la résistance à la traction maximale est similaire. La caractérisation physico-chimique des pastilles de PLA montrent une distribution homogène des complexes. Les essais de viabilité cellulaire indiquent que les disques traités soutiennent la prolifération et favorisent l’organisation des cellules endothéliales en structures vasculaires.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Regenerative medicine has experienced major growth in recent decades, notably driven by the development of 3D printing technologies enabling the fabrication of innovative implants.The first objective of this study was to produce a PLA interference screw using 3D printing and to assess its mechanical properties, specifically torsional and tensile strength, in an anterior cruciate ligament reconstruction model.The second objective was to promote the formation of vascular structures in contact with PLA pellets by incorporating nanoreservoirs loaded with VEGF, with the aim of enhancing graft osseointegration. Mechanical tests revealed a difference in maximum torsional strength between the screws, while maximum tensile strength remained comparable. Physicochemical characterization of the PLA pellets showed a homogeneous distribution of the complexes, and cell viability assays demonstrated that the treated discs support cell proliferation and promote the organization of endothelial cells into vascular structures.</dcterms:abstract>
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