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

Autor: Velo MMAC; Bauru School of Dentistry, University of São Paulo-USP, Bauru, SP, Brazil. Electronic address: mariliavelo@usp.br., Nascimento TRL; Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMat), Federal University of Paraíba (UFPB), João Pessoa, Brazil; Bio-Active Materials Group, Department of Materials, MSS Tower, The University of Manchester, Manchester, M13 9PL, UK., Scotti CK; Bauru School of Dentistry, University of São Paulo-USP, Bauru, SP, Brazil., Bombonatti JFS; Bauru School of Dentistry, University of São Paulo-USP, Bauru, SP, Brazil., Furuse AY; Bauru School of Dentistry, University of São Paulo-USP, Bauru, SP, Brazil., Silva VD; Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMat), Federal University of Paraíba (UFPB), João Pessoa, Brazil., Simões TA; Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMat), Federal University of Paraíba (UFPB), João Pessoa, Brazil., Medeiros ES; Materials and Biosystems Laboratory (LAMAB), Department of Materials Engineering (DEMat), Federal University of Paraíba (UFPB), João Pessoa, Brazil., Blaker JJ; Bio-Active Materials Group, Department of Materials, MSS Tower, The University of Manchester, Manchester, M13 9PL, UK., Silikas N; Dentistry, School of Medical Sciences, The University of Manchester, Manchester M13 9PL, UK., Mondelli RFL; Bauru School of Dentistry, University of São Paulo-USP, Bauru, SP, Brazil.
Jazyk: angličtina
Zdroj: Dental materials : official publication of the Academy of Dental Materials [Dent Mater] 2019 Nov; Vol. 35 (11), pp. e272-e285. Date of Electronic Publication: 2019 Sep 10.
DOI: 10.1016/j.dental.2019.08.102
Abstrakt: Objectives: In this study hybrid nanofibers embedded with niobium pentoxide (Nb 2 O 5 ) 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+1wt.% PDLLA fibers; (3) U200+1wt.% Nb 2 O 5 -filled PDLLA composite fibers and (4) U200+1wt.% Nb 2 O 5 /SiO 2 -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 (α=5%).
Results: Composite fibers formed of PDLLA-Nb 2 O 5 exhibited an average diameter of ∼250nm, and hybrid PDLLA+Nb 2 O 5 /SiO 2 fibers were slightly larger, ∼300nm 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+Nb 2 O 5 and PDLLA+Nb 2 O 5 /SiO 2 presented superior mechanical performance than the control group.
(Copyright © 2019 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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