Influência da adição de compósitos contendo grafeno sobre propriedades mecânicas do cimento de ionômero de vidro

• Autor(a) principal: Campos, Adriano Rocha
• Data de Publicação: 2020
• Outros Autores: [e-mail]
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/19512
• topic: Graphene oxide; Reduced graphene oxide; Zinc oxide; Glass ionomer cement; Microhardness; Óxido de grafeno; Óxido de grafeno reduzido; Óxido de zinco; Cimento de ionômero de vidro; Microdureza; CIENCIAS DA SAUDE::ODONTOLOGIA

Even though several advantages for dental purposes, such as chemical adhesion to the dental surface and the continuous release of fluoride, glass ionomer cement (GIC) has mechanical limitations that restrict its use, such as low resistance to traction and compression. A relatively recent discovery has drawn much attention from the scientific community in recent years: graphene. Among its many applications, considerable attention has been given to the material in the most diverse areas of health, including dentistry. The objective of this work was to evaluate whether the addition of GO and its variations to the GIC would bring some improvement to its mechanical properties, such as microhardness, compressive strength, and tensile test by diametrical compression. Graphene oxide (GO) was produced using the modified Hummers method and reduced graphene oxide (RGO) was produced through thermal reduction of GO. Zinc Oxide (ZnO) and variations with GO and RGO were synthesized by the hydrothermal method. Through infrared spectroscopy (FTIR), Raman spectroscopy (RS) and x-ray diffraction (XRD) analyses, the presence of GO, RGO, and ZNO in the synthesis of composites was confirmed. The composites were added to the GIC powder by mechanical stirring and then prepared with the liquid. It was possible to observe a statistically significant increase in microhardness, but the same was not repeated for the values found in the compressive strength and diametrical tensile analyses.