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

Autor(es):Mostrar menos -

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 35, n. 11, p. E272-E285, NOV 2019.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 19/06045-2 - Síntese e caracterização físico-química de um biopolímero de mantas de nanofibras (Cotton wool-like) de óxido de grafeno
• Beneficiário: Rafael Francisco Lia Mondelli
• Modalidade de apoio: Auxílio à Pesquisa - Regular