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    Boron nitride nanotubes as novel fillers for improving the properties of dental adhesives

    Year: 2017

    Journal: J. Dent., Volume 62, JUL, page 85–90

    Authors: Degrazia, Felipe Weidenbach; Branco Leitune, Vicente Castelo; Werner Samuel, Susana Maria; Collares, Fabrcio Mezzomo

    Organizations: CAPES

    Keywords: Resin cement; Dental cement; Remineralization

    Objective: This study aimed to evaluate the physical-chemical properties of experimental dental adhesives containing boron nitride nanotubes (BNNTs) as inorganic fillers. Methods: An experimental adhesive resin was prepared using HEMA-BisGMA, 66/33 wt% (control). Inorganic BNNT fillers were first analyzed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and then incorporated into the adhesive at different concentration (0.05, 0.075, 0.1, 0.15 wt%). Degree of conversion (DC), ultimate strength, contact angle, surface free energy (SFE) microhardness, softening in solvent and bioactivity were assessed. Results: Scanning and transmission electron microscopy (SEM and TEM) showed BNNTs with diameter ranging from 5 to 10 nm with close end tips. No changes in DC were observed after incorporating BNNTs up to 0.15 wt%. The contact angles of water and alpha-bromonaphthalene increased (p < 0.05) and consequently the SFE decreased after incorporating BNNTs to the polymer matrix. Microhardness and solvent degradation strength increased after incorporation of 0.075, 0.1 and 0.15 wt% BNNTs. Mineral deposition was found after 7 days of immersion on adhesive specimens after incorporation of BNNT. Conclusions: The incorporation of BNNTs up to 0.15 wt% improved the chemical and mechanical properties of dental adhesives and promoted mineral deposition. Clinical Significance: Incorporation of boron nitride nanotubes into adhesive resin materials improved physical-chemical properties and increased mineral deposition on its surface allowing enhanced properties of the resin-dentin interface. Thus, the novel adhesive material is promising as a dental adhesive and may contribute to the stability of the dentin-resin bonding.
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