Synthesis, characterization and application of Ag doped ZnO nanoparticles in a composite resin

Publication date: Available online 17 October 2018Source: Materials Science and Engineering: CAuthor(s): Hércules Bezerra Dias, Maria Inês Basso Bernardi, Valéria Spolon Marangoni, Adilson César de Abreu Bernardi, Alessandra Nara de Souza Rastelli, Antônio Carlos HernandesAbstractThe biofilm accumulation over the composite resin restorations can contribute to the formation of secondary caries. In this way, antibacterial restorative composite resins are highly desired. Then, the purpose of this study was to modify a composite resins using Ag doped ZnO nanoparticles (NPs), evaluate the antibacterial and mechanical properties of the modified composite resin. The ZnO/AgNPs were synthesized by two different routes, polymeric precursor and coprecipitation methods, and characterized by thermal decomposition, X-ray diffraction, specific surface area by N2 desorption/desorption and scanning electron microscopy (SEM). Antibacterial activity of composite resin specimens (4 mm in height and 2 mm in diameter; n = 15) modified by ZnO/Ag nanoparticles was performed against 7-days Streptococcus mutans biofilm. Colony forming units (CFU/mL) were used to evaluate the bacterial activity. Additionally, the morphology and the bacteria adherence area were analyzed by SEM images. Cylindrical specimens (6 mm in height and 4 mm in diameter; n = 20) of the composite resin containing ZnO/Ag NPs were prepared to perform compressive strength in a universal mechanical test machine, an...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research