Niobium pentoxide as a new filler for methacrylate‐based root canal sealers

Leitune, Vicente Castelo Branco; Takimi, Antônio Shigueaki; Collares, Fabrício Mezzomo; Santos, Paula Dapper; Provenzi, Camila; Bergmann, Carlos Pérez; Samuel, Susana Maria Werner

doi:10.1111/j.1365-2591.2012.02107.x

Cited by 31 publications

(32 citation statements)

References 27 publications

(62 reference statements)

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“…The incorporation of inorganic fillers into polymers may enhance adhesives' mechanical properties and improve the clinical practice 5,[7][8][9][10][11] . It decreases the composite's organic phase and the adhesives may be more hydrolytic stable, as the water sorption occurs mainly in the organic matrix 29) .…”

Section: Discussionmentioning

confidence: 99%

“…Many modifications have been proposed in the adhesive resins to contribute to the longevity of the restorative treatments [4][5][6] . A current trend involves the incorporation of inorganic fillers to decrease the relative amount of organic phase, providing a higher hydrolytic stability to resin and a reliable cavity seal [7][8][9][10][11][12] . Besides physical and chemical properties, the addition of inorganic fillers may increase the radiopacity.…”

Section: Introductionmentioning

confidence: 99%

“…To eliminate the use of glasses, one solution is to use heavy-atom compound as homogeneous filler in matrix 15) . Ytterbium trifluoride (YbF3) 11) , barium sulphate (BaSO4), calcium tungstate (CaWO4) 16) and niobium pentoxide (Nb2O5) 8,10) have been used. However, the incorporation of the inorganic filler needs to be in low concentrations in order to not compromise the wetting of the dental substrate due to high viscosity of the resin while it is possible to increase the radiopacity and mechanical properties of the material 14) .…”

Section: Introductionmentioning

confidence: 99%

“…However, the incorporation of the inorganic filler needs to be in low concentrations in order to not compromise the wetting of the dental substrate due to high viscosity of the resin while it is possible to increase the radiopacity and mechanical properties of the material 14) . Tantalum is known to be a radiopaque element 17) and a biocompatible material 10,18) . Furthermore, tantalum metal showed bioactivity 19,20) and affinity to phosphate groups 21) , enabling the deposition and nucleation of apatite on its surface.…”

Section: Introductionmentioning

confidence: 99%

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Tantalum oxide as filler for dental adhesive resin

García

Leitune

Ferreira

et al. 2018

Dental Materials Journal

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The purpose of this study was to formulate and evaluate an adhesive resin with tantalum oxide. Ta2O5 was evaluated by scanning electron microscopy and laser diffraction. The adhesive was formulated with methacrylate monomers and photoinitiators. Ta2O5 was added into the adhesive at 1, 2, 5 and 10 wt%. One group remained without filler (control group). Ta2O5 distribution, radiopacity (n=5), degree of conversion (DC) (n=3), softening in solvent (n=5) and ultimate tensile strength (UTS) (n=10) were evaluated. Data were analyzed by one-way ANOVA and Tukey's test (α=0.05). Spherical nanometric Ta2O5 was arranged in 3.35 µm particles. The groups over 5 wt% presented higher radiopacity (p<0.05). The DC ranged from 61.78 (±1.19)% to 67.35 (±1.40)%, with statistical difference from control group over 5 wt% addition (p<0.05). There was no difference in softening in solvent (p>0.05) and UTS (p>0.05). Tantalum oxide is a promising alternative for adhesive formulation and it could be further tested for biomimetic remineralization.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tantalum oxide as filler for dental adhesive resin

García

Leitune

Ferreira

et al. 2018

Dental Materials Journal

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“…Niobium pentoxide (Nb 2 O 5 ) has shown mineralization induction through mineral deposition in previous studies [12][13][14], demonstrating promising proprieties. Nb 2 O 5 was also evaluated as a filler for adhesive resins and methacrylate-based endodontic cements and enhances the Knoop microhardness and radiopacity of these materials [15,16]. Besides, Nb 2 O 5 presents the ability to diffuse into the hybrid layer when inserted into an adhesive resin applied following the etching and primer application in a 3-step etch-and-rinse adhesive system [16].…”

Section: Introductionmentioning

confidence: 99%

Mineral deposition at dental adhesive resin containing niobium pentoxide

et al. 2014

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The aim of this study was to asses in vitro the potential of methacrylate-based adhesive resins containing niobium pentoxide (Nb 2 O 5 ) for stimulating phosphate deposition. Adhesive resins were obtained by mixing 50 wt% BisGMA, 25 wt% TEGDMA and 25 wt% HEMA, and Nb 2 O 5 was added on 2.5 or 5 wt% to the resin. Discs 6.5 mm in diameter and 1.5 mm in height of the resin without Nb 2 O 5 and of the resins presenting the oxide were obtained by inserting the resin into a silicon matrix, followed by photo activation. Discs were immersed in simulated body fluid at 36°C for 1, 7 and 28 days, and then their surfaces were examined by Raman spectroscopy. Changes of intensity of the 962 cm −1 peak, related to phosphate bond, over the samples' surfaces were used to assess the potential of adhesive resins to stimulate phosphate deposition. Experimental groups containing 2.5 and 5 wt% niobium pentoxide presented a phosphate-rich layer deposition over their surfaces after 7 and 28 days of SBF immersion, and this deposition increased over time. Incorporation of 2.5 or 5 wt% niobium pentoxide provides the potential to promote phosphate deposition on methacrylate-based adhesive resins.

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Methacrylate‐based root canal sealer containing chlorexidine and α‐tricalcium phosphate

et al. 2017

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The aim of this study was to develop and to characterize a methacrylate-based root canal sealer containing chlorhexidine (CHX) and α-tricalcium phosphate (α-TCP). Experimental dual cure methacrylate-based sealer was produced containing 0, 2.5, or 5 wt% of CHX and 0, 25, or 50 wt% of α-TCP. Experimental sealers were evaluated based on flow, film thickness, radiopacity, degree of conversion (DC), degradation in water, pH and antibacterial activity. Flow ranged from 15.09 ± 0.11 to 17.47 ± 0.42 mm. All groups presented mean film thickness lower than 50 µm and had radiopacity equivalent to 3 mmAl. DC was higher than 60% for all compositions. The weight loss (WL) ranged 0.12-3.47%. The groups containing 5% of CHX presented the highest WL and the lower pH values after 28 days of water immersion. All chlorexidine-compositions exhibited antibacterial efficacy against Enterococcus faecalis on direct contact and agar diffusion tests. CHX and α-TCP addition at an experimental methacrylate-based root canal sealer influenced the physicochemical properties and provided antibacterial properties. The incorporation of CHX and α-TCP could be an alternative to antibacterial sealers with potential to improve periapical healing in endodontic treatments. © 2017 Wiley Periodicals, Inc. J Biomater Res Part B: 106B: 1439-1443, 2018.

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Niobium pentoxide as a new filler for methacrylate‐based root canal sealers

Abstract: The addition of Nb(2) O(5) increases radio-opacity and microhardness; this material may be a promising filler for the production of a new endodontic sealer.

Cited by 31 publications

References 27 publications

Tantalum oxide as filler for dental adhesive resin

Tantalum oxide as filler for dental adhesive resin

Mineral deposition at dental adhesive resin containing niobium pentoxide

Methacrylate‐based root canal sealer containing chlorexidine and α‐tricalcium phosphate

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