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Evaluation of mechanical and microbiological properties of an orthodontic composite resin cement modified with nanoestrutured silver vanadate decorated with silver nanoparticles (²-AgVO3)

Grant number: 22/01185-3
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): April 01, 2022
Effective date (End): March 31, 2023
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Andréa Cândido dos Reis
Grantee:Livia Maiumi Uehara
Host Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


Orthodontic treatment, with the use of fixed appliances and resin cements, creates an environment conducive to the proliferation of microorganisms. Thus, the importance of developing adhesive materials that have antimicrobial capacity is highlighted. Nanostructured silver vanadate decorated with silver nanoparticles (²-AgVO3) consists of a nanomaterial whose metal ions are continuously released and act as a potent antibacterial agent. The present study aims to analyze the effect of incorporating different percentages of ²-AgVO3 in an orthodontic cement, evaluating its influence on the degree of conversion, surface roughness, surface microhardness, adhesion property (before and after thermocycling) and in antimicrobial capacity. Transbond XT composite resin orthodontic cement will be used and 60 specimens will be made with (n=20) per group (Control group; Group with addition of 2.5%; Group with addition of 5%). The degree of monomer conversion will be evaluated by Fourier transform infrared spectroscopy. The surface roughness (n=10) will be evaluated with a laser confocal microscope. The surface microhardness (n=10) will be analyzed by means of printing, on the surface of the discs, with a diamond indenter at a load of 50Gf, for 15 seconds. Shear strength will be evaluated before and after the artificial aging process, in 36 premolar teeth, with (n=6). The agar diffusion method will be used for microbiological analysis, performed with (n=10), with the microorganisms Streptococcus mutans and Streptococcus sanguinis. Data will be analyzed for distribution and the most appropriate statistical tests will be applied.(AU)

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