Abstract
The aim of this study was to evaluate the influence of boron-nitride nanotubes (BNNTs) on the properties of resin-based light-curing dental sealants (RBSs) when incorporated at different concentration. RBSs were formulated using methacrylate monomers (90 wt.% TEGDMA, 10 wt.% Bis-GMA). BNNTs were added to the resin blend at 0.1 wt.% and 0.2 wt.%. A Control group without filler was also designed. Degree of conversion, ultimate tensile strength, contact angle, surface free energy, surface roughness and color of the RBSs were evaluated for the tested materials. Their cytotoxicity and mineral deposition ability (Bioactivity) were also assessed. A suitable degree of conversion, no effect in mechanical properties and no cytotoxic effect was observed for the experimental materials. Moreover, the surface free energy and the surface roughness decreased with the addition of BNNTs. While the color analysis showed no difference between specimens containing BNNTs and the control group. Mineral deposition occurred in all specimens containing BNNTs after 7d. In conclusion, the incorporation of BNNTs may provide bioactivity to resin-based dental sealants and reduce their surface free energy.
Highlights
Resin-based dental sealants (RBSs) are recommended for microinvasive treatments for caries lesions[1]
The results of this study showed that the presence of Boron-nitride nanotubes (BNNTs) in the tested experimental resin-based light-curing dental sealants (RBSs) promoted mineral deposition between a period of 7 and 14 days of immersion in artificial saliva (AS)
The addition of nanofillers had no negative effect on the physicochemical properties of the experimental BNNT-RBSs; the only exception was for a decrease in surface free energy (SFE) observed in enamel surface after treatment with 0.2 wt.% BNNTs containing RBS
Summary
Resin-based dental sealants (RBSs) are recommended for microinvasive treatments for caries lesions[1] This treatment aims to physically seal the dental tissues in order to avoid biofilm accumulation in those areas at potentially risk of caries, such as occlusal and proximal surfaces. The precipitation of minerals promoted by BNNTs might contribute to the therapeutic effects of RBS in reducing the risk of caries in kids and adults The addition of this nanometric filler may affect the monomer conversion, the mechanical properties, the wetting ability, the surface properties, the color and the biocompatibility of these materials. The aim of this study was to investigate the influence of BNNTs addition to an experimental methacrylate-based sealant This objective was accomplished through the evaluation of the degree of conversion, contact angle, surface free energy, surface roughness and color of the tested RBSs doped with BNNTs, which were compared to a filler-free control www.nature.com/scientificreports/. Cytotoxicity assessment and mineral deposition (bioactivity) at 7, 14 and 28 days of immersion in artificial saliva (AS) were evaluated
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