Effect of the addition of functionalized TiO2 nanotubes and nanoparticles on properties of experimental resin composites

Autor: Adilson Yoshio Furuse, Ana Flávia Sanches Borges, Carmem S. Pfeifer, Paulo Noronha Lisboa-Filho, Erika S. Bronze-Uhle, G. M. F. Guimarães, Carla Castiglia Gonzaga, Ana Paula Piovezan Fugolin
Přispěvatelé: Universidade de São Paulo (USP), Universidade Estadual Paulista (Unesp), Oregon Hlth & Sci Univ, Posit Univ Curitiba
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Popis: Made available in DSpace on 2021-06-25T12:27:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-12-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Objective. To evaluate the influence of the addition of functionalized and non-functionalized TiO2 nanostructures on properties of a resin composite. Methods. TiO2 nanostructures were synthesized and functionalized, using 3(aminopropyl)triethoxysilane (APTMS) and 3-(trimethoxysilyl)propyl methacrylate (TSMPM). Characterizations were performed with XRD, EDS, TEM, and TGA. Resin composites containing Bis-GMA/TEGDMA, CQ, DABE, and barium-aluminum silicate glass were produced according to TiO2 nanostructure (nanotube or nanoparticle), concentration (0.3 or 0.9 wt%), and functionalization (APTMS or TSMPM). The resin composite without nanostructures was used as control. The amount of fillers was kept constant at 78.3 wt% for all materials. The degree of conversion (DC at 0 h and 24 h), maximum polymerization rate (Rp(max)), and Knoop microhardness (KHN before and after ethanol softening) were evaluated. Data were analyzed with two-way ANOVA with repeated measures and Tukey's HSD (a = 0.05). Results. TGA results demonstrated that functionalizations were effective for both nanostructures. For DC, resin composites, time and interaction effect were significant (p < 0.001). Higher DC was found for 0.3-wt%-functionalized-nanotubes at 24 h. For nanoparticles, only 0.9-wt%-non-functionalized and 0.3-wt%-APTMS-functionalized showed DC similar to the control and all other groups showed higher DC (p < 0.05). Rpmax was higher for 0.3-wt%APTMS-nanotubes, which corresponded to higher DC after 24 h. The lowest Rpmax occurred for 0.9-wt%-TSMPM-nanotubes, which showed smaller DC at 0 h. For KHN, resin composites, ethanol softening and interaction effect were significant (p < 0.001). KHN decreased after ethanol softening all groups, except for 0.3-wt%-TSMPM-nanotubes, 0.9-wt%-TSMPMnanotubes, and 0.3-wt%-non-functionalized-nanoparticles. Conclusion. The resin with 0.3-wt%-TSMPM-nanotubes showed higher DC after 24 h, while being the most stable material after the ethanol softening. Significance. The addition of functionalized TiO2 nanostructures in resin-based materials may improve the properties of the material. (C) 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Bauru, SP, Brazil State Univ Sao Paulo, Fac Sci, Dept Phys, Bauru, SP, Brazil Oregon Hlth & Sci Univ, Dept Restorat Dent, Div Biomat & Biomech, Portland, OR 97201 USA Posit Univ Curitiba, Sch Hlth Sci, Grad Program Dent, Curitiba, Parana, Brazil State Univ Sao Paulo, Fac Sci, Dept Phys, Bauru, SP, Brazil FAPESP: 2017/23331-3 FAPESP: 2019/05427-9 CAPES: 001
Databáze: OpenAIRE
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