Avaliação in situ e in vitro do efeito antimicrobiano de um nanofilme experimental de dióxido de silício com nanopartículas de prata

• Autor(a) principal: Fernandes, Bárbara Monteiro Pessôa
• Data de Publicação: 2016
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14068
• topic: Silicon dioxide; Silver nanoparticles; Dental biofilm; Nanofilm; Antimicrobial; Dióxido de silício; Nanopartículas de prata; Biofilme dental; Nanofilme; Antimicrobiano; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The propagation of nanotechnology in order to design new nanoscale materials led to the development of a wide variety of nanoparticles manufactured for commercial applications. With the objective of seeking a product that enhances the characteristics of dental materials in vogue, it was decided to search for a new material that is not used in dentistry, but has a wide applicability in various fields, such as in the food industry, surface countertops of hospitals, surgical instruments, walls, floors, clothing and automotive, aviation and shipbuilding industry. Thus, it sought to evaluate a silicon dioxide nanofilm, commercially available as liquid glass, and its possible improvement with the addition of silver nanoparticles to its composition using samples of acrylic resin as substrate. Initially tests were carried out to characterize the liquid glass solution by evaluating the solids content and their density, beyond the surface of nanofilms formed by means of a scanning electron microscope (SEM) coupled with energy dispersive spectrometer (EDS). Then it was examined microbiological behavior of nanofilms for cytotoxicity and in vitro and in situ biofilm formation. In the liquid glass characterization it was identified a small discrepancy in the solids content and the density obtained compared to manufacturer's data. The SEM and EDS analysis confirmed the presence of silver in the experimental nanofilm and allowed the observation of the nanoclusters configuration formed after polymerization of both films. The cytotoxicity assay showed that after the formation of nanofilm this is not cytotoxic, but the silica and the experimental solutions exhibit cytotoxicity at lower dilutions. As to the formation of biofilm regardless of the type of substrate and the assay in situ or in vitro, experimental nanofilm inhibit bacterial adhesion. It follows then that the silica experimental nanofilm with silver nanoparticles developed in this work has the potential to reduce bacterial growth in dental materials provisionally applied in critical areas where tissue healing is required