The Influence of a Translucent Fiberglass Post on the Polymerization of Dual Cure Resin Cement Analyzed by Electron Paramagnetic Resonance

Salomão, Fábio Martins; Vicentin, Bruno Luiz Santana; Contreras, Edwin Fernando Ruiz; Hoeppner, Márcio Grama; Mauro, Eduardo Di

doi:10.1590/1516-1439.022115

Cited by 13 publications

(6 citation statements)

References 24 publications

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“…Proportionality was observed between the FR concentration and quality of the resinous material, indicating that EPR spectroscopy is an important tool for understanding these dental restorative materials [22]. These data are in accordance with Salomão et al [24]. In that case, authors studied the influence of the irradiation protocol in the depth of cure and observed that the irradiation protocol influences only in the first 8 mm of the 20-mm long double-shaped translucent fiberglass post.…”

Section: Resultssupporting

confidence: 84%

Influence of Geometrical Configuration of a Translucent Fiberglass Post on the Polymerization of a Dual Cure Resin Cement Analyzed by EPR Spectroscopy

et al. 2015

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This research aimed to study the influence of the geometrical configuration of a translucent fiberglass post on the dual cure resin cement polymerization by electron paramagnetic resonance (EPR) spectroscopy. A 20-mm long, White Post DC no. 1 fiberglass post (FGM, Joinvile, SC, Brazil) was sectioned in half to obtain two different groups of posts: cylindrical and conical. Each post was cemented with AllCem A1 dual cure resin cement (FGM, Joinvile, SC, Brazil) using a root canal model and light cured for 40 s. Following cementation, the post was removed and sectioned to obtain 2 mm samples at different depth of cementation. EPR spectra were obtained 10 min and 24 h after cementation to determine the concentration of free radicals (FR) in the surrounding hardened (cured) dental cement, once the concentration of FR is proportional to the light intensity at the restoration point. No significant decrease was observed in light transmission through the cylindrical post that affected the FR concentration, at depths up to 5.5 mm. In contrast, a decrease was verified for all samples conical geometry. The light conduction was effective up to 5.5 mm of curing depth when a cylindrical post was used. The cylindrical configuration was more efficient at conducting light to the deepest points of the restoration compared with the conical configuration.

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Section: Resultssupporting

confidence: 84%

Influence of Geometrical Configuration of a Translucent Fiberglass Post on the Polymerization of a Dual Cure Resin Cement Analyzed by EPR Spectroscopy

et al. 2015

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“…First, we focused on Mn(acac) 3 /Dket1 interaction. Interestingly, in Figure A, the final polymer cured using Mn(acac) 3 /Dket1 (curve 1) or BPO/4- N , N -TMA (curve 2) shows radicals trapped in the polymer matrix at 3500 ± 50 G (see also Figure B), in line with the literature. − On the contrary, the signal of the polymer is clearly showing six bands typical of Mn(II) when the Mn(acac) 3 /Dket1 initiating system is used (Figure A, curve 1); we can therefore clearly expect that some Mn(II) are trapped in the polymer after reaction. In other words, it strongly suggests the reduction of Mn(III) to Mn(II) by Dket1.…”

Section: Resultssupporting

confidence: 83%

Peroxide-Free and Amine-Free Redox Free Radical Polymerization: Metal Acetylacetonates/Stable Carbonyl Compounds for Highly Efficient Synthesis of Composites

et al. 2018

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New peroxide-free, amine-free, and phosphine-free redox free radical polymerization (RFRP) initiating systems comprising remarkably stable (i) metal acetylacetonates (Mn(acac)3, Cu(acac)2) and (ii) carbonyl compounds bearing labile hydrogen in the α-position are presented for polymerization initiation under mild conditions (under air, at room temperature, nonpurified monomers). The systems proposed in this work are competitive or even outranked the well-known peroxide-based RFRP reference in several criteria: (i) toxicity, (ii) stability, (iii) surface curing, (iv) overall double-bond conversions, and (v) workability of the RFRP mixture (longer gel times are now possible). Radical initiating reactions are studied using many complementary experimental/theoretical techniques: optical pyrometry, thermal imaging, Raman confocal microscopy, electron spin resonance (ESR), ESR spin trapping (ESR-ST), high-resolution electrospray ionization mass spectrometry (HR-ESI-MS), density functional theory (DFT), simulations of bond dissociation energies (BDE), reaction enthalpies, and DFT simulations of seven unknown ESR-ST adducts. A full consistent picture of the chemical mechanisms involved in these new redox systems is provided.

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“…Nevertheless, KF posts are less translucent than everStick ® and other commercial glass fiber posts. It has been suggested that the ability of light to be transmitted along translucent posts could increase the conversion degree of light-cured resin cements with a consequent improvement of their mechanical properties, however, the efficiency of this propagation, especially in the deeper regions has still to be investigated 33) . A previous report showed no significant difference in root dentine bond strength values between translucent and opaque fiber posts 34) .…”

Section: Discussionmentioning

confidence: 99%

Semi-interpenetrating network composites reinforced with Kevlar fibers for dental post fabrication

et al. 2019

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This study evaluates the reinforcement of semi-interpenetrating network composites of 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropyl)phenyl] propane (Bis-GMA)/ triethyleneglycol dimethacrylate (TEGDMA)/polymethyl methacrylate (PMMA) and 25% titanium dioxide (TiO2) nanofiller with surface treated Kevlar fibers for potential application as dental posts. The post material was subjected to thermo-cycling and flexural strength determined, characterised by dynamic mechanical analysis, water sorption, radiopacity and cytotoxicity tests. The results were compared with everStick ® POST. Kevlar pre-treatment with acetic acid and silane coupling agent demonstrated a clear effect on the flexural strength of the composites with a significant increase compared to composites with fibers without surface treatment. The inclusion of TiO2 into the final formulation provided the desired radiopacity and improved both aesthetics and flexural strength, which exhibits a higher resistance on thermocycling. The ratios of fatigue limit to static flexural strength were about 0.73 for Kevlar and 0.58 for everStick ® POST; MTT assay confirmed the absence of any toxic eluents, indicating its feasibility as new intracanal post material.

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The Influence of a Translucent Fiberglass Post on the Polymerization of Dual Cure Resin Cement Analyzed by Electron Paramagnetic Resonance

Cited by 13 publications

References 24 publications

Influence of Geometrical Configuration of a Translucent Fiberglass Post on the Polymerization of a Dual Cure Resin Cement Analyzed by EPR Spectroscopy

Influence of Geometrical Configuration of a Translucent Fiberglass Post on the Polymerization of a Dual Cure Resin Cement Analyzed by EPR Spectroscopy

Peroxide-Free and Amine-Free Redox Free Radical Polymerization: Metal Acetylacetonates/Stable Carbonyl Compounds for Highly Efficient Synthesis of Composites

Semi-interpenetrating network composites reinforced with Kevlar fibers for dental post fabrication

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