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Influence of concentration and functionalization of nanotubes and nanoparticles of TiO2 in the properties of experimental resins

Grant number: 17/23331-3
Support type:Scholarships in Brazil - Master
Effective date (Start): May 01, 2018
Effective date (End): February 28, 2019
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Adilson Yoshio Furuse
Grantee:Genine Moreira de Freitas Guimarães
Home Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil

Abstract

The aim of this work is to evaluate the influence of different concentrations of functionalized and nonfunctionalized TiO2 nanotubes and nanoparticles on the properties of experimental resins. Resins containing BIS-GMA and TEGDMA (3:1 by weight) and 0,25wt% campohorquinone (CQ) and 1wt% DMAEMA amine. TiO2 Nanotubes and nanoparticles will be functionalized using a silane 3-aminopropyl trimethoxysilane (APTMS) or a experimental functionalization using 3-Trimethoxysilyl-Propyl-Methacrylate (TMSPM). The incorporation of TiO2 nanostructures to the experimental resins will be made by mechanical mixing and 0,3wt% or 0,9wt% will be added. Functionalized and non-functionalized TiO2 nanostructures will be characterized by X-ray diffractometry, transmission electron microscopy, Fourier transformed infrared spectroscopy, and thermogravimetric analysis. Resin disks (n=10) will be prepared with a polytetrafluoroethylene mold (6 mm in diameter x 1 mm in thickness) and will be distributed in groups according to the type, quantity and functionalization of TiO2 nanostrutures. The specimens will be light-activated for 20 seconds. The analysis of the degree of conversion will be performed through the FTIR-ATR. The analysis of the microhardness will be performed through a Knoop indenter performing 3 indentations in each sample. For the evaluation of the crosslink density, after the initial top-surface hardness (MK1) evaluation, the specimens will be immersed in ethanol for 24 hours and the top hardness will be reassessed (MK2). The results will be analyzed through 3-way Anova and Tukey tests, in case of normal distribution and homogeneity of variances. The level of significance adopted will be 5%. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE FREITAS GUIMARAES, GENINE MOREIRA; BRONZE-UHLE, ERIKA SOARES; LISBOA-FILHO, PAULO NORONHA; PIOVEZAN FUGOLIN, ANA PAULA; SANCHES BORGES, ANA FLAVIA; GONZAGA, CARLA CASTIGLIA; PFEIFER, CARMEM SILVIA; FURUSE, ADILSON YOSHIO. Effect of the addition of functionalized TiO2 nanotubes and nanoparticles on properties of experimental resin composites. Dental Materials, v. 36, n. 12, p. 1544-1556, DEC 2020. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.