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

Degrazia, Felipe Weidenbach; Leitune, Vicente Castelo Branco; Samuel, Susana Maria Werner; Collares, Fabrício Mezzomo

doi:10.1016/j.jdent.2017.05.013

Cited by 38 publications

(26 citation statements)

References 54 publications

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“…The addition of particles with remineralization potential aims to improve the performance of the sealant-enamel interface against the acidic challenge caused by oral bacteria. The apatite formation ability of BNNTs after 7, 14 and 28 days once soaked in simulated body fluid was already reported in previous study 14,35 performed on surfaces of dental adhesives containing BNNTs 15 . The current study showed an increase of the intensity of phosphate peaks (≈960 cm −1 ) in the specimens containing BNNTs (at 7 to 28 days in artificial saliva).…”

Section: Discussionsupporting

confidence: 73%

“…Due to their nanometric size, high surface/volume ratio, surface functionality, high elastic modulus, biocompatibility 12 hydrophobicity, chemical inertness and susceptibility to precipitation in water solutions, BNNTs have gained great attention in biomedical science 13 . The apatite formation ability of BNNTs in physiological solutions has been advocated 14 , even when these were used as filler for resin dental adhesives 15 . 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.…”

Section: Introductionmentioning

confidence: 99%

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Boron Nitride Nanotubes as Filler for Resin-Based Dental Sealants

Bohns

Degrazia

Balbinot

et al. 2019

Sci Rep

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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.

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Section: Discussionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Boron Nitride Nanotubes as Filler for Resin-Based Dental Sealants

Bohns

Degrazia

Balbinot

et al. 2019

Sci Rep

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“…The incorporation of fillers in polymers may also change the contact angle and surface free energy (SFE) [23]. Besides, a previous study showed that the penetration coefficient (PC) of commercial sealants is correlated to their ability to penetrate fissures.…”

Section: Discussionmentioning

confidence: 99%

Dental Sealant Empowered by 1,3,5-Tri Acryloyl Hexahydro-1,3,5-Triazine and α-Tricalcium Phosphate for Anti-Caries Application

et al. 2020

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: Quaternary ammonium compounds and calcium phosphates have been incorporated into dental materials to enhance their biointeractivity and preventive effects. This study aimed at evaluating the physical and chemical properties and effects against Streptococcus mutans of a dental sealant containing 1,3,5-tri acryloyl hexahydro-1,3,5-triazine (TAT) and α-tricalcium phosphate (α‐TCP). A methacrylate-based dental sealant was initially formulated. α‐TCP and TAT (Gα-TCPTAT) were added to the experimental sealant at 2 wt.% each. One group was formulated without α‐TCP and TAT and used as control (GCTRL). All tested resins were analyzed for polymerization kinetics and degree of conversion (DC %), Knoop hardness (KHN), softening in solvent (∆KHN%), ultimate tensile strength (UTS), the contact angle with water or with α-bromonaphthalene, surface free energy (SFE) and antibacterial activity against Streptococcus mutans in biofilm and in planktonic cells. The polymerization kinetic was different between groups, but without statistical differences in the DC % (p<0.05). KHN and ΔKHN% did not change between groups (p>0.05), but Gα-TCPTAT presented greater UTS compared to GCTRL (p<0.05). No differences were found for contact angle (p>0.05) or SFE (p>0.05). Gα-TCPTAT showed greater antibacterial activity in comparison to GCTRL (p<0.05). The formulation of dental sealants containing TAT and α-TCP can be characterized by improved mechanical and antibacterial properties.

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“…The contact angle and the SFE of polymers may also change due to the incorporation of fillers, as boron nitride nanotubes in dental adhesives, 42 or different monomers, as quaternary alkylammonium in dental composites. 43 A lower value of contact angle with water was obtained for G 2% compared to G 0.5% and G 1% , with no significant differences between each PHMGH group and G CTRL .…”

Section: Discussionmentioning

confidence: 99%

Antibacterial, chemical and physical properties of sealants with polyhexamethylene guanidine hydrochloride

et al. 2019

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The aim of this study was to evaluate the influence of polyhexamethylene guanidine hydrochloride (PHMGH) in the physicochemical properties and antibacterial activity of an experimental resin sealant. An experimental resin sealant was formulated with 60 wt.% of bisphenol A glycol dimethacrylate and 40 wt.% of triethylene glycol dimethacrylate with a photoinitiator/co-initiator system. PHMGH was added at 0.5 (G 0.5%), 1 (G 1%), and 2 (G 2%) wt.% and one group remained without PHMGH, used as control (G CTRL). The resin sealants were analyzed for degree of conversion (DC), Knoop hardness (KHN), and softening in solvent (ΔKHN), ultimate tensile strength (UTS), contact angle (θ) with water or α-bromonaphthalene, surface free energy (SFE), and antibacterial activity against Streptococcus mutans for biofilm formation and planktonic bacteria. There was no significant difference for DC (p > 0.05). The initial Knoop hardness ranged from 17.30 (±0.50) to 19.50 (± 0.45), with lower value for G CTRL (p < 0.05). All groups presented lower KHN after immersion in solvent (p < 0.05). The ΔKHN ranged from 47.22 (± 4.30) to 57.22 (± 5.42)%, without significant difference (p > 0.05). The UTS ranged from 54.72 (± 11.05) MPa to 60.46 (± 6.50) MPa, with lower value for G 2% (p < 0.05). PHMGH groups presented no significant difference compared to G CTRL in θ (p > 0.05). G 2% showed no difference in SFE compared to G CTRL (p > 0.05). The groups with PHMGH presented antibacterial activity against biofilm and planktonic bacteria, with higher antibacterial activity for higher PHMGH incorporation (p < 0.05). PHMGH provided antibacterial activity for all resin sealant groups and the addition up to 1 wt.% showed reliable physico-chemical properties, maintaining the caries-protective effect of the resin sealant over time.

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

Cited by 38 publications

References 54 publications

Boron Nitride Nanotubes as Filler for Resin-Based Dental Sealants

Boron Nitride Nanotubes as Filler for Resin-Based Dental Sealants

Dental Sealant Empowered by 1,3,5-Tri Acryloyl Hexahydro-1,3,5-Triazine and α-Tricalcium Phosphate for Anti-Caries Application

Antibacterial, chemical and physical properties of sealants with polyhexamethylene guanidine hydrochloride

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