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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

BIOCOMPATIBILIDADE DE SCAFFOLDS NANOFIBROSOS CONTENDO METRONIDAZOL OU CIPROFLOXACINA EM MODELO DE IMPLANTAÇÃO SUBCUTÂNEA EM RATOS / BIOCOMPATIBILITY OF NANOFIBERS SCAFFOLDS CONTAINING METRONIDAZOLE OR CIPROFLOXACIN IN SUBCUTANEOUS IMPLANTATION MODEL

Passos, Patrícia Cabral 29 July 2016 (has links)
Evidence shows there is no ideal membrane, i.e., biocompatible, biodegradable, with adequate mechanical and physical properties that enable reorganization of periodontal tissues. Eletrospinning technique has demonstrated good processing results on scaffolds made from polymers. Nanofibrous formed by this technique have characteristics that resemble the extracellular matrix. The aim of this study was to evaluate the biocompatibility of nanofibrous polydioxanone scaffolds (PDS II®) containing metronidazole or ciprofloxacin in subcutaneous implantation model in rats Wistar. PDS II® is biocompatible polyester having various applications in the medical field. Our conceptual hypothesis considers that scaffolds with antimicrobials have similar inflammatory behavior when compared to PDS positive control. Sixty adult male rats were randomized into 6 groups: negative control (SHAM) animals with incision and surgical pocket, without scaffold; positive control (PDS) animals with PDS scaffolds; 1MET animals with one PDS scaffold containing 25%wt metronidazole; 2MET animals with two PDS scaffolds containing 25%wt metronidazole, 1CIP animals with PDS scaffolds containing 25%wt ciprofloxacin; 2CIP animals with two PDS scaffolds containing 25%wt ciprofloxacin. Animals were euthanized at 3 days (n=30) and 30 days (n=30), corresponding to initial and late inflammatory responses, respectively. Outcomes measures were the degradation of collagen fibers (Picrosirius Red and Masson´s trichrome), activity of cellular enzyme (Myeloperoxidase activity and N-acetyl-β-D-glucosaminidase activity) and local oxidative profile (reactive oxygen species, lipid peroxidation, protein carbonyl, vitamin C, catalase and reduced glutathione). Dara were analyzed statistically (p<0.05) by two-way ANOVA (treatment and time). Collectively, results show that antibiotics scaffolds have a lower inflammatory response compared to PDS group. Among the nanofibers with antibiotics, the group showed better early and late inflammatory response was 2CIP. The findings of this research suggest the potential study of these scaffolds with metronidazole and ciprofloxacin in regenerative models, able to confirm the effectiveness of these artificial matrices for periodontal regeneration. / Evidências mostram que não há membranas ideais, ou seja, biocompatíveis, biodegradáveis, com propriedades mecânicas e físicas adequadas que permitam a reestruturação dos tecidos periodontais. A técnica do eletrospinning tem demonstrado bons resultados no processamento de scaffolds confeccionados a partir de polímeros. As nanofibras formadas por esta técnica possuem características que se assemelham a matriz extracelular. O objetivo do presente estudo foi avaliar a biocompatibilidade de scaffolds nanofibrosos de polidioxonona (PDS II®) contendo metronidazol ou ciprofloxacina em modelo de implantação subcutânea em ratos Wistar. A PDS II® é um poliéster biocompatível com diversas aplicações na área médica. Nossa hipótese conceitual considerou que scaffolds com antimicrobianos teriam semelhante comportamento inflamatório quando comparados ao controle positivo PDS. Sessenta ratos machos adultos foram randomizados em seis grupos: controle negativo (SHAM) - animais com incisão e loja cirúrgica, ausentes de scaffolds; controle positivo (PDS) - animais com scaffolds de PDS, 1 scaffold PDS com 25%wt de metronidazol (1MET), 2 scaffolds PDS com 25%wt de metronidazol (2MET), 1 scaffold PDS com 25%wt de ciprofloxacina (1CIP), 2 scaffolds com 25%wt de ciprofloxacina (2CIP). Os animais foram eutanasiados em 3 (n=30) e 30 dias (n=30), correspondendo a resposta inflamatória inicial e tardia, respectivamente. Os desfechos avaliados foram degradação de fibras colágenas (Picrosírius Red e Tricrômico de Masson), atividade de enzimáticas celulares (mieloperoxidase e N-Acetil β-D-Glicosaminidase) e perfil oxidativo local [espécies reativas de oxigênio (ROS), peroxidação lipídica (LP), proteína carbolinada (PC), catalase (CAT), vitamina C (VIT.C) e glutationa reduzida (GSH)]. Os dados foram analisados estatisticamente (p<0,05) através do teste Two-way ANOVA (tratamento e tempo). Coletivamente, os resultados mostram que scaffolds com antibióticos possuem menor resposta inflamatória se comparado ao grupo PDS. Entre as nanofibras com antibióticos, o grupo que apresentou melhor resposta inflamatória inicial e tardia foi 2 CIP. Os achados desta pesquisa sugerem o potencial estudo destes scaffolds com metronidazol e ciprofloxacina em modelos regenerativos, capazes de confirmar a efetividade dessas matrizes artificiais para a regeneração periodontal.

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