Effect of diphenyliodonium hexafluorophosphate on the physical and chemical properties of ethanolic solvated resins containing camphorquinone and 1-phenyl-1,2-propanedione sensitizers as initiators

Dressano, Diogo; Palialol, Alan Rodrigo Muniz; Xavier, Tathy Aparecida; Braga, Roberto Ruggiero; Oxman, Joe D.; Watts, David C.; Marchi, Giselle Maria; Lima, Adriano Fonseca

doi:10.1016/j.dental.2016.03.010

Cited by 45 publications

(65 citation statements)

References 25 publications

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“…The presence of both DPI and chitosan led to a reduction in the degree of conversion of the experimental materials (Figure 1), in contrast with the findings of previous studies by Ogliari, et al, 12 Gonçalves, et al, 13 and Dressano et al, 21 who obtained an increase in the degree of conversion in their results associated with the presence of the ion salt. However, Elsaka 14 showed that chitosan at 0.12% and 0.25% concentrations in an adhesive, despite inducing significant antibacterial improvements, caused a decrease in the degree of conversion of the evaluated polymer.…”

Section: Discussioncontrasting

confidence: 85%

“…On the other hand, regarding solubility ( Figure 5), DPI has been found to have a negative influence at 0.5% and 1%, regardless of the concentration of chitosan involved; this is consistent with previous investigations. 13,21 The lower degree of conversion of the infiltrants containing ion salt and chitosan in their composition could have led to increased leaching of unreacted monomers during water storage.…”

Section: Discussionmentioning

confidence: 99%

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Effect of iodonium salt and chitosan on the physical and antibacterial properties of experimental infiltrants

et al. 2019

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Resinous infiltrants are indicated in the treatment of incipient carious lesions, and further development of these materials may contribute to greater control of these lesions. The aim of this study was to analyze the physical and antibacterial properties of experimental infiltrants containing iodonium salt and chitosan. Nine experimental infiltrants were formulated by varying the concentration of the diphenyliodonium salt (DPI) at 0, 0.5 and 1 mol%; and chitosan at 0, 0.12 and 0.25 g%. The infiltrants contained the monomeric base of triethylene glycol dimethacrylate and bisphenol-A dimethacrylate ethoxylate in a 75 and 25% proportion by weight, respectively; 0.5 mol% camphorquinone and 1 mol% ethyl 4-dimethylaminobenzoate. The degree of conversion was evaluated using Fourier transformer infrared spectroscopy, and the flexural strength and elastic modulus using the three-point bending test. Sorption and solubility in water, and antibacterial analysis (minimum inhibitory concentration and minimum bactericidal concentration) were also analyzed. Data was analyzed statistically by two-way ANOVA and Tukey's test (p<0.05), with the exception of the antibacterial test, which was evaluated by visual inspection. In general, the infiltrant group containing 0.5% DPI and 0.12% chitosan showed high values of degree of conversion, higher values of elastic modulus and flexural strength, and lower sorption values in relation to the other groups. Antibacterial activity was observed in all the groups with DPI, regardless of the concentration of chitosan. The addition of DPI and chitosan to experimental infiltrants represents a valid option for producing infiltrants with desirable physical and antibacterial characteristics.

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Section: Discussioncontrasting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Effect of iodonium salt and chitosan on the physical and antibacterial properties of experimental infiltrants

et al. 2019

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“…It should be noted that this cement and the LCUs tested belong to the same manufacturer. Factors such as initiators and co-initiators,72728 as well as the selected filler particles and the respective refractive indices29 can influence the polymerization of the system positively, favored by the characteristics of the LCU, such as wavelength spectrum emitted and the beam profile, resulting in a relatively high compatibility between the resin system and the LCU.…”

Section: Discussionmentioning

confidence: 99%

“…These LEDs have the similar capacity of conventional single-peak devices to activate camphorquinone (CQ); however, they present a great advantage since these units emit a broad spectrum of wavelengths, allowing the activation of alternative photoinitiators, such as phenyl-1,2-propanedione (PPD, 393 nm),7 bisacylphosphine oxide (BAPO, 370 nm),8 or monoacylphosphine oxide (MAPO, 380 nm) 9…”

Section: Introductionmentioning

confidence: 99%

Effects of radiant exposure and wavelength spectrum of light-curing units on chemical and physical properties of resin cements

et al. 2016

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ObjectivesIn this study, we evaluated the influence of different radiant exposures provided by single-peak and polywave light-curing units (LCUs) on the degree of conversion (DC) and the mechanical properties of resin cements.Materials and MethodsSix experimental groups were established for each cement (RelyX ARC, 3M ESPE; LuxaCore Dual, Ivoclar Vivadent; Variolink, DMG), according to the different radiant exposures (5, 10, and 20 J/cm2) and two LCUs (single-peak and polywave). The specimens were made (7 mm in length × 2 mm in width × 1 mm in height) using silicone molds. After 24 hours of preparation, DC measurement was performed using Fourier transform infrared spectrometry. The same specimens were used for the evaluation of mechanical properties (flexural strength, FS; elastic modulus, E) by a three-point bending test. Data were assessed for normality, after which two-way analysis of variance (ANOVA) and post hoc Tukey's test were performed.ResultsNo properties of the Variolink cement were influenced by any of the considered experimental conditions. In the case of the RelyX ARC cement, DC was higher when polywave LCU was used; FS and E were not influenced by the conditions evaluated. The LuxaCore cement showed greater sensitivity to the different protocols.ConclusionsOn the basis of these results, both the spectrum of light emitted and the radiant exposure used could affect the properties of resin cements. However, the influence was material-dependent.

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“…Prev ious st udies tested t he addit ion of diphenyliodonium hexafluorphosphate (DPI) to a photo-initiator system to improve the polymerization kinetics and the degree of conversion of resin materials. 16,17,18,19,20 Regarding experimental lightcuring resin cements, the presence of DPI resulted in improved mechanical properties without increased polymerization stress. 15 Although this sensitizer is excited only by UV light (300 nm), in the presence of another initiator, such as camphorquinone (CQ), decomposition of this salt may occur, increasing the ways of free-radical release for the polymerization of methacrylates, 16 acting as a catalyst for the reaction.…”

Section: Introductionmentioning

confidence: 99%

Light curing resin cements containing iodonium salts promote suitable apical bonding of posts to radicular dentin

et al. 2018

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The aim of this study was to analyze the efficiency of experimental light-curing resin cements (ERCs) with a ternary photo-initiator system containing diphenyliodonium hexafluorphosphate (DPI) and different amines on retention of glass-fiber posts to dentin (GFP). ERCs formulations: a 1:1 mass ratio of 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy) phenylpropane and triethyleneglycol dimethacrylate. Camphorquinone was used as initiator. Six experimental groups were established according to the amine used: [ethyl-4-(dimethylamino)benzoate-EDMAB or 2-(dimethylamino)ethyl methacrylate-DMAEMA] and the concentration of DPI (0, 0.5 mol%, 1 mol%). The resin cements Variolink II (dual-and light-cured versions) were used as commercial reference. Eighty recently extracted bovine incisors (n = 10) were selected for this study. The roots were prepared and the fiber posts were cemented with the resin cement specified for each experimental group. Specimens from coronal, middle, and apical thirds of the root were subjected to push-out bond strength test 24 hours after bonding. Data were subjected to split-plot ANOVA and the Tukey test (p = 0.05). ERCs containing DPI showed statistically significant higher bond strengths compared with ERCs without DPI. ERCs containing DPI were statistically similar to VARIOLINK II-dual-cured and superior to VARIOLINK II-light-cured (except for EDMAB-1DPI in the medium third and DMAEMA-1DPI in the coronal third). Different amines did not influence post retention. The apical root region showed the lowest bond strength for the groups EDAB-0DPI, DMAEMA-0DPI and VARIOLINK II light-cured. Light-cured ERCs containing DPI were efficient for GFP retention to radicular dentin, with similar behaviour to that of dual-curing commercial resin cement.

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Effect of diphenyliodonium hexafluorophosphate on the physical and chemical properties of ethanolic solvated resins containing camphorquinone and 1-phenyl-1,2-propanedione sensitizers as initiators

Cited by 45 publications

References 25 publications

Effect of iodonium salt and chitosan on the physical and antibacterial properties of experimental infiltrants

Effect of iodonium salt and chitosan on the physical and antibacterial properties of experimental infiltrants

Effects of radiant exposure and wavelength spectrum of light-curing units on chemical and physical properties of resin cements

Light curing resin cements containing iodonium salts promote suitable apical bonding of posts to radicular dentin

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