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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.)

Improved mechanical performance of self-adhesive resin cement filled with hybrid nanofibers-embedded with niobium pentoxide

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Velo, Marilia M. A. C. [1] ; Nascimento, Tatiana R. L. [2, 3] ; Scotti, Cassiana K. [1] ; Bombonatti, Juliana F. S. [1] ; Furuse, Adilson Y. [1] ; Silva, Vinicius D. [2] ; Simoes, Thiago A. [2] ; Medeiros, Eliton S. [2] ; Blaker, Jonny J. [3] ; Silikas, Nikolaos [4] ; Mondelli, Rafael F. L. [1]
Total Authors: 11
Affiliation:
[1] Univ Sao Paulo, Bauru Sch Dent, Bauru, SP - Brazil
[2] Fed Univ Paraiba UFPB, Dept Mat Engn DEMat, Mat & Biosyst Lab LAMAB, Joao Pessoa, Paraiba - Brazil
[3] Univ Manchester, Dept Mat, Bioact Mat Grp, MSS Tower, Manchester M13 9PL, Lancs - England
[4] Univ Manchester, Sch Med Sci, Dent, Manchester M13 9PL, Lancs - England
Total Affiliations: 4
Document type: Journal article
Source: Dental Materials; v. 35, n. 11, p. E272-E285, NOV 2019.
Web of Science Citations: 0
Abstract

Objectives. In this study hybrid nanofibers embedded with niobium pentoxide (Nb2O5) were synthesized, incorporated in self-adhesive resin cement, and their influence on physical-properties was evaluated. Methods. Poly(D,L-lactide), PDLLA cotton-wool-like nanofibers with and without silica-based sol-gel precursors were formulated and spun into submicron fibers via solution blow spinning, a rapid fiber forming technology. The morphology, chemical composition and thermal properties of the spun fibers were characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS) and Fourier-transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC), respectively. Produced fibers were combined with a self-adhesive resin cement (RelyX U200, 3M ESPE) in four formulations: (1) U200 resin cement (control); (2) U200 + 1 wt.% PDLLA fibers; (3) U200 + 1 wt.% Nb2O5-filled PDLLA composite fibers and (4) U200 + 1 wt.% Nb2O5/SiO2-filled PDLLA inorganic-organic hybrid fibers. Physical properties were assessed in flexure by 3-point bending (n = 10), Knoop microhardness (n=5) and degree of conversion (n=3). Data were analyzed with One-way ANOVA and Tukey's HSD (alpha = 5%). Results. Composite fibers formed of PDLLA-Nb2O5 exhibited an average diameter of similar to 250 nm, and hybrid PDLLA + Nb2O5/SiO2 fibers were slightly larger, similar to 300 nm in diameter. There were significant differences among formulations for hardness and flexural strength (p < 0.05). Degree of conversion of resin cement was not affected for all groups, except for Group 4 (p <0.05). Significance. Hybrid reinforcement nanofibers are promising as fillers for dental materials. The self-adhesive resin cement with PDLLA+ Nb2O5 and PDLLA+ Nb2O5/SiO2 presented superior mechanical performance than the control group. (C) 2019 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 19/06045-2 - Synthesis and physical-chemical characterization of a cotton-wool-like nanofibers biopolymer of graphene oxide
Grantee:Rafael Francisco Lia Mondelli
Support Opportunities: Regular Research Grants