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Autor: Gonçalves, Isabela dos Santos ×

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    Biocomposite macrospheres based on strontium-bioactive glass for application as bone fillers
    (American Chemical Society) Oliveira, Ivone Regina de; Gonçalves, Isabela dos Santos; Santos, Kennedy Wallace dos; Lança, Maria Carmo; Vieira, Tânia; Silva, Jorge Carvalho; Cengiz, Ibrahim Fatih; Reis, Rui Luís; Oliveira, Joaquim Miguel; Borges, João Paulo Miranda Ribeiro
    Traditional bioactive glass powders are typically composed of irregular particles that can be packed into dense configurations presenting low interconnectivity, which can limit bone ingrowth. The use of novel biocomposite sphere formulations comprising bioactive factors as bone fillers are most advantageous, as it simultaneously allows for packing the particles in a 3-dimensional manner to achieve an adequate interconnected porosity, enhanced biological performance, and ultimately a superior new bone formation. In this work, we develop and characterize novel biocomposite macrospheres of Sr-bioactive glass using sodium alginate, polylactic acid (PLA), and chitosan (CH) as encapsulating materials for finding applications as bone fillers. The biocomposite macrospheres that were obtained using PLA have a larger size distribution and higher porosity and an interconnectivity of 99.7%. Loose apatite particles were observed on the surface of macrospheres prepared with alginate and CH by means of soaking into a simulated body fluid (SBF) for 7 days. A dense apatite layer was formed on the biocomposite macrospheres’ surface produced with PLA, which served to protect PLA from degradation. In vitro investigations demonstrated that biocomposite macrospheres had minimal cytotoxic effects on a human osteosarcoma cell line (SaOS-2 cells). However, the accelerated degradation of PLA due to the degradation of bioactive glass may account for the observed decrease in SaOS-2 cells viability. Among the biocomposite macrospheres, those composed of PLA exhibited the most promising characteristics for their potential use as fillers in bone tissue repair applications.
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    Development and characterization of ceramic-polymeric hybrid scaffolds for bone regeneration: incorporating of bioactive glass BG-58S into PDLLA matrix
    (Taylor & Francis) Aguiar, Veronica Cristina Pêgo Fiebig; Bezerra, Rayssa do Nascimento; Santos, Kennedy Wallace dos; Gonçalves, Isabela dos Santos; Costa, Karen Julie Santos Grancianinov; Lauda, Diogo Ponte; Campos, Tiago Moreira Bastos; Prado, Renata Falchete do; Vasconcellos, Luana Marotta Reis de; Oliveira, Ivone Regina de
    In recent years, there has been a notable surge of interest in hybrid materials within the biomedical field, particularly for applications in bone repair and regeneration. Ceramic-polymeric hybrid scaffolds have shown promising outcomes. This study aimed to synthesize bioactive glass (BG-58S) for integration into a bioresorbable poly- meric matrix based on PDLLA, aiming to create a bioactive scaffold featuring stable pH levels. The synthesis involved a thermally induced phase separation process followed by lyophilization to ensure an appropriate porous structure. BG-58S characterization revealed vitreous, bioactive, and mesoporous structural properties. The scaffolds were analyzed for morphology, interconnectivity, chemical groups, porosity and pore size distribution, zeta potential, pH, in vitro degradation, as well as cell viability tests, total protein content and mineralization nodule production. The PDLLA scaffold displayed a homogeneous morphology with interconnected mac- ropores, while the hybrid scaffold exhibited a heterogeneous mor- phology with smaller diameter pores due to BG-58S filling. The hybrid scaffold also demonstrated a pH buffering effect on the polymer surface. In addition to structural characteristics, degrada- tion tests indicated that by incorporating BG-58S modified the acidic degradation of the polymer, allowing for increased total pro- tein production and the formation of mineralization nodules, indi- cating a positive influence on cell culture.
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    Produção de Membranas no Sistema PVA-Hidroxiapatita por Eletrofiação
    (2023) Gonçalves, Isabela dos Santos; Lopes, João Henrique; Oliveira, Ivone Regina de
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    Síntese e Caracterização de Vidro Bioativo (BG-58S) pela Rota Sol-Gel sem e com a Presença de Solvente e Agente Porogênico
    (2023) Aguiar, Veronica Cristina Pêgo Fiebig; Gonçalves, Isabela dos Santos; Ortega, Fernando dos Santos; Grancianinov, Karen Julie Santos; Lauda, Diogo Ponte; Oliveira, Ivone Regina de
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    Síntese e caracterização de vidro bioativo (BG-58S) pela rota sol-gel sem e com a presença de solvente e agente porogênico
    (2023-12-05) Aguiar, Veronica Cristina Pêgo Fiebig; Gonçalves, Isabela dos Santos; Ortega, Fernando dos Santos; Costa, Karen Julie Santos Grancianinov; Lauda, Diogo Ponte; Oliveira, Ivone Regina de
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    Produção de Membranas no Sistema PVA-hidroxiapatita por eletrofiação
    (2023-12-05) Gonçalves, Isabela dos Santos; Lopes, João Henrique; Oliveira, Ivone Regina de