Characterization of thin films of Ag-doped TiO2 with antimicrobial properties for use in orthodontic products

Reference Presenter Authors
02-052 Ellen Lopes Alves Alves, E.L.(REDEMAT UFOP); Bacterial resistance to antibiotics becomes a growing concern and a challenge for medicine. Researchers have been struggling to discover new antibacterial agents, with an interest in nanoparticulate materials. The use of nanotechnology can be observed in several fields, including applications in dentistry. Ag nanoparticles (AgNPs) dispersed in ceramic matrices can add new properties to dentistry materials, mainly in the form of nanocomposite films. Titanium dioxide (TiO2) is the matrix option studied in this work due to its versatility. Ag/TiO2 ceramic matrix composite (CMC) is highlighted by its antibacterial properties, reducing the biofilm accumulation of pathogenic bacteria in teeth, related to caries and consequently inhibiting the dental demineralization process. The composite is used as thin film deposited superficially in bands and orthodontic brackets via sol-gel process. 
X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and electronic microanalysis (EDS) techniques were used in the structural and morphological characterization of the thin films on the surface of orthodontic products evidencing the dispersion of silver nanoparticles in the TiO2 anatase structure. The prepare films were homogeneous, resistant and free of cracks. 
In vitro microbiological tests were performed to investigate the film antimicrobial effect using Staphylococcus Aureus and Escherichia Coli. The initial results inhibiting the growth of microorganisms were satisfactory.
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