Documentos de conferencia

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https://hdl.handle.net/10784/28218

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Examinando Documentos de conferencia por Autor "Correa S."

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    Novel smart dental composite with rechargeable antimicrobial capability
    (Society for Biomaterials, 2019-01-01) Londoño J.J.; Kosater W.; Correa S.; Orrego S.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Bioingeniería GIB (CES – EAFIT)
    Statement of Purpose: The most common cause of failure for dental restorations is secondary caries [1]. It results from bacterial colonization (e.g. Streptococcus mutans) at the interface between the implanted biomaterial and hard tissue. The bonding strength is degraded by bacterial acid production and cyclic stresses from mastication. Resin composites are currently the most widely used material for restorations due to their great aesthetics, strength, and ease of processing. However, resins present the highest failure rate [2] due to the increased accumulation of biofilms (increased acid production) compared to other restorative materials [3]. Recent studies have developed resin composites with antibacterial properties to mitigate acid production. However, the antimicrobial effects are vanished over time since the antibiofilm agents leach-out and no longer are capable to repel bacteria. In this work, we present a novel smart biomaterial with long-lasting antibiofilm capabilities with a single filler. The novel resin filler produces electrical charges that disrupt oral bacteria, (antimicrobial effect) and are activated by mastication. © 2019 Omnipress - All rights reserved.
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    Study of the suitability of a commercial hydroxyapatite powder to obtain sintered compacts for medical applications
    (IOP PUBLISHING LTD, 2017-06-13) Palacio C.; Jaramillo D.; Correa S.; Arroyave M.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Bioingeniería GIB (CES – EAFIT)
    Hydroxyapatite (HA) is a material widely used by the medical community due to its Ca/P ratio is comparable to the Ca/P ratio of bones and teeth, which promotes osteoinduction and osteoconduction processes when in contact with bone tissue, either as volume piece or coating. This work focuses on studying the quality of the commercial HA powder MKnano-#MKN-HXAP-S12 µm, after processing, to obtain sintered compact discs with suitable physical and chemical characteristics for implants applications. The HA powder was processed through calcination, grinding, pressing and sintering to evaluate the effect of such as procedures in the compacts dics quality. The raw powder was characterized by laser diffraction, SEM, XRF, XRD, TGA and DSC while the characteristics of the obtained compact discs were determined by dilatometry and XRD to identify the sintering temperature range, constituent phases, the amorphous content and the crystallinity degree, parameters that allow determining their suitability for implants applications. Although, it was not possible to obtain sintered compacts with the suitable chemical composition and without fractures, this work allowed to identify the parameters that determine the suitability of a HA powder to obtain sintered compacts for medical applications, as well as the characterization protocol that allows the evaluation of such parameters. © Published under licence by IOP Publishing Ltd.