Effect of the addition of functionalized TiO2 nanotubes and nanoparticles on properties of experimental resin composites
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 methacryla...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/209720 |
| Acceso en línea: | http://dx.doi.org/10.1016/j.dental.2020.09.013 http://hdl.handle.net/11449/209720 |
| Access Level: | acceso abierto |
| Palabra clave: | Titanium dioxide Nanostructures Functionalization Polymer structure Methacrylates |
| Sumario: | 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. |
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