Author(s) Velo, M.M.A.C.; Nascimento, T.R.L.; Scotti, C.K.; Bombonatti, J.F.S.; Furuse, A.Y.; Silva, V.D.; Simões, T.A.; Medeiros, E.S.; Blaker, J.J.; Silikas, N.; Mondelli, R.F.L.
Journal Dent Mater
Date Published 2019 11

OBJECTIVES: In this study hybrid nanofibers embedded with niobium pentoxide (NbO) 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.% NbO-filled PDLLA composite fibers and (4) U200+1wt.% NbO/SiO-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-NbO exhibited an average diameter of ∼250nm, and hybrid PDLLA+NbO/SiO 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+NbO and PDLLA+NbO/SiO presented superior mechanical performance than the control group.

DOI 10.1016/
Keywords Dental Bonding; Dental Cements; Materials Testing; Nanofibers; Niobium; Oxides; Resin Cements; Silicon Dioxide; Surface Properties
ISSN 1879-0097
Citation Dent Mater. 2019;35(11):e272e285.

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