Effect of diphenyliodonium hexafluorphosphate on resin cements containing different concentrations of ethyl 4-(dimethylamino)benzoate and 2-(dimethylamino)ethyl methacrylate as co-initiators

Andrade, Kamila Menezes Guedes de; Palialol, Alan Rodrigo Muniz; Lancellotti, Ailla Carla; Aguiar, Flávio Henrique Baggio; Watts, D.C.; Gonçalves, Luciano de Souza; Lima, Adriano Fonseca; Marchi, Giselle Maria

doi:10.1016/j.dental.2016.03.014

Cited by 29 publications

(35 citation statements)

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“…However, when DPI was added to 1 mol% CQ, a decrease in DC was observed. Generally, the necessary concentration of amine:CQ is 2:1 or more in photoinitiator systems 14 . In the present study, the salt added to this system may have hindered the collision of molecules during the reaction because of its ionic nature and hydrophilic characteristics, which is in contrast to hydrophobic CQ and EDAB.…”

Section: Discussionmentioning

confidence: 99%

Effect of diphenyliodonium hexafluorphosphate in the yellowing and properties of experimental resin cements

et al. 2019

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Aim: The yellowing effect is undesirable and can occur in the dental restoration margins when light-cured resin cements containing camphorquinone as photoinitiator is used. This study aimed to evaluate the effect of diphenyliodonium hexafluorphosphate (DPI) in photoinitiator systems that contained different concentrations of camphorquinone (CQ) and dimethylamino ethyl benzoate (EDAB) on resin cements. Methods: A base (1:1) of bisphenol A diglycidyl methacrylate (BisGMA) and triethylene glycol dimethacrylate (TEGDMA) was obtained, and 60wt% of glass fillers was added. Eight formulations were obtained: RC1 (0.5mol% CQ / 1mol% EDAB), RC2 (0.5mol% CQ / 2mol% EDAB), RC3 (1mol% CQ / 1mol% EDAB), RC4 (1mol% CQ / 2mol% EDAB), and RC5 to RC8, which contained the same bases plus 0.5mol% DPI. Experimental resin cements were evaluated by the degree of conversion (DC), L*a*b* color analysis, water sorption (WS) and solubility (S), flexural strength, and Elastic Modulus. The data were analyzed by three-way ANOVA, Tukey’s and Mann-Whitney tests (α = 0.05). Results: The combination of DPI and 0.5mol% CQ increased DC in RC6 and L* in RC5 without increasing the WS and a* b* values. CQ at 1mol% showed higher values of b* and lower values of a*, except for RC3. Groups with 2mol% EDAB showed higher DC. Conclusion: The addition of DPI reduces CQ, generating a decreased yellowing effect, while maintaining adequate properties in the resin cements, especially with 2mol% EDAB.

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Section: Discussionmentioning

confidence: 99%

Effect of diphenyliodonium hexafluorphosphate in the yellowing and properties of experimental resin cements

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%

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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“…Generally, aromatic tertiary amines such as ethyl-4dimethylaminobenzoate (EDMAB) are considered more efficient than linear chain tertiary amines such as dimethylaminoethyl methacrylate (DMAEMA) due to a greater localisation of electrons through aromatic groups allowing a more efficient electron transfer process and reduces the possibility of back electron transfer. Back electron transfer reverses the excited state of the photoinitiator and restores the donor and acceptor to their original oxidation levels which retards the hydrogen abstraction process and the generation of photoinitiator radicals which ultimately reduces the efficiency of photopolymerization (Andrade et al, 2016;de Oliveira et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Diphenyliodonium salts (DPI) has been used for years to improve the polymerization process of radicalar and cationic reactions (Cook and Chen, 2011;Oxman et al, 2005;Timpe and Rajendran, 1991). In addition, DPI photosensitisers have been shown to improve efficency of CQ/amine photoinitiator systems by reducing the back electron transfer process, leading to remarkable improvements in degree of conversion, rate of polymerization and depth of cure (Andrade et al, 2016;Goncalves et al, 2013;Ogliari et al, 2007). The use of DPI photosensiters to improve curing efficiency of resin based materials rather than alternative photoinitiators has several advantages.…”

Section: Introductionmentioning

confidence: 99%

Increased rates of photopolymerisation by ternary type II photoinitiator systems in dental resins

Lima

Salvador

Dressano

et al. 2019

Journal of the Mechanical Behavior of Biomedical Materials

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Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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Effect of diphenyliodonium hexafluorphosphate on resin cements containing different concentrations of ethyl 4-(dimethylamino)benzoate and 2-(dimethylamino)ethyl methacrylate as co-initiators

Abstract: EDAB proved to be more reactive than DMAEMA, being less influenced by DPI. Resins containing a 1:2 CQ/amine ratio had better properties than those with 1:1.

Cited by 29 publications

References 29 publications

Effect of diphenyliodonium hexafluorphosphate in the yellowing and properties of experimental resin cements

Effect of diphenyliodonium hexafluorphosphate in the yellowing and properties of experimental resin cements

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

Increased rates of photopolymerisation by ternary type II photoinitiator systems in dental resins

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