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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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de Freitas Guimaraes, Genine Moreira [1] ; Bronze-Uhle, Erika Soares [1] ; Lisboa-Filho, Paulo Noronha [2] ; Piovezan Fugolin, Ana Paula [3] ; Sanches Borges, Ana Flavia [1] ; Gonzaga, Carla Castiglia [4] ; Pfeifer, Carmem Silvia [3] ; Furuse, Adilson Yoshio [1]
Total Authors: 8
[1] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Bauru, SP - Brazil
[2] State Univ Sao Paulo, Fac Sci, Dept Phys, Bauru, SP - Brazil
[3] Oregon Hlth & Sci Univ, Dept Restorat Dent, Div Biomat & Biomech, Portland, OR 97201 - USA
[4] Posit Univ Curitiba, Sch Hlth Sci, Grad Program Dent, Curitiba, Parana - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Dental Materials; v. 36, n. 12, p. 1544-1556, DEC 2020.
Web of Science Citations: 0

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. (AU)

FAPESP's process: 19/05427-9 - Dental adhesives modified by TiO2 nanotubes as carriers of enzyme inhibitors: synthesis, functionalization and incorporation of nanotubes and evaluation of enzymatic activity physico-chemical, mechanical and biological properties
Grantee:Adilson Yoshio Furuse
Support Opportunities: Regular Research Grants
FAPESP's process: 17/23331-3 - Influence of concentration and functionalization of nanotubes and nanoparticles of TiO2 in the properties of experimental resins
Grantee:Genine Moreira de Freitas Guimarães
Support Opportunities: Scholarships in Brazil - Master