BAPO as an alternative photoinitiator for the radical polymerization of dental resins

Meereis, Carine Taís Welter; Leal, Fernanda; Lima, Giana S.; Carvalho, Rodrigo Varella de; Piva, Evandro; Ogliari, Fabrício Aulo

doi:10.1016/j.dental.2014.05.020

Cited by 103 publications

(84 citation statements)

References 23 publications

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“…The sample scanning was performed simultaneously with the photoactivation for 60 s. Analysis was performed at a controlled room temperature of 23 °C (±2 °C) and 60% (± 5%) relative humidity. The DC (%) and Rp (s -1 ) were calculated as previously described, 23,24 considering the intensity of carbon-carbon double-bond stretching vibration (peak height) at 1,635 cm…”

Section: Kinetics Of Polymerization (Kp)mentioning

confidence: 99%

“…After 24 h storage in distilled water at 37°C, in the dark, the bar-shaped dimensions were measured with a digital caliper; the flexural strength and elastic modulus 24 were obtained in a three-point bending test on a mechanical testing machine (EMIC DL500) using a span of 8 mm and a crosshead speed of 0.5 mm/min.…”

Section: Flexural Strength (Fs) and Elastic Modulus (E)mentioning

confidence: 99%

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Evaluation of long-term bond strength and selected properties of self-adhesive resin cements

et al. 2018

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This study evaluated the shear bond strength (SBS) of self-adhesive resin cements (SARCs) to dentin and their physical-chemical properties. Five commercial SARCs were evaluated [SmartCem®2 -DENTSPLY (SC2); BisCem® -Bisco (BC); SeT PP® − SDI (SeT); Relyx U100® -3M ESPE (U100) and YCEM® SA -Yller (YCEM)]. The SARCs were evaluated for SBS to dentin (n = 10) after 24 h, 6 months, and 12 months. The dentin demineralization caused by acidic monomers was observed by SEM, and pH-neutralization of eluate was observed for 24 h. Degree of conversion (DC), rate of polymerization (Rp), flexural strength (FS), and elastic modulus (E) were evaluated. Immediate SBS of SC2, SET, U100, and YCEM were statistically higher than that of BC (p < 0.001). After 12 months, all SARCs showed reduced SBS values and U100 showed values similar to those of SET and YCEM, and higher than those of BC and SC2 (p = 0.001). Demineralization pattern of SARCs was similar. At 24h, all SARCs showed no differences in the pH-value, except BC and U100 (p < 0.001). YCEM showed the highest Rp. U100, YCEM, and SC2 showed statistically higher FS (p<0.001) and E (p < 0.001) when compared with SET and BC. U100 and YCEM showed the best long-term bonding irrespective of the storage period. A significant reduction in SBS was found for all groups after 12 months. SBS was not shown to be correlated with physical-chemical properties, and appeared to be material-dependent. The polymerization profile suggested that an increased time of light activation, longer than that recommended by manufacturers, would be necessary to optimize DC of SARCs.

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Section: Kinetics Of Polymerization (Kp)mentioning

confidence: 99%

Section: Flexural Strength (Fs) and Elastic Modulus (E)mentioning

confidence: 99%

Evaluation of long-term bond strength and selected properties of self-adhesive resin cements

et al. 2018

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“…BAPO has an increased efficiency in free radicals generation, higher than TPO and CQ. Following the light energy absorption, this molecule undergoes an α-cleavage in the excited triplet state of the C-P bond, which may occur twice, with the ability to generate four free radicals per molecule (16), while TPO can generate two and CQ only one (17). Furthermore, BAPO and TPO have higher molar absorption coefficients than CQ, which means that those compounds absorb more light than CQ at the corresponding maximum absorption peak (18).…”

Section: Discussionmentioning

confidence: 99%

Influence of Photoinitiator System on Physical-Chemical Properties of Experimental Self-Adhesive Composites

et al. 2017

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The aim of this study was to determine the influence of photoinitiator systems on physical-chemical properties of flowable composites. Conventional (CFC), composed by bisphenol-glycidyl dimethacrylate (BisGMA)+triethyleneglycol dimethacrylate (TEGDMA), and self-adhesive (SAFC), composed by BisGMA+TEDGMA+bis[2-(methacryloyloxy) ethyl] phosphate (2MP), flowable composites were developed. Five photoinitiator systems were tested: camphorquinone (CQ), ethyl-4-dimethylaminobenzoate (EDMAB), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), phenylbis (2,4,6-trimethylbenzoyl)phosphine oxide (BAPO), CQ+EDMAB+TPO and CQ+EDMAB+BAPO. A two-peak LED was used; degree of conversion (DC) and the maximum polymerization rate (RP max ) were determined by nearinfrared spectroscopy. For the yellowing degree a spectrophotometer was used. Water sorption (Wsp) was obtained after 30 days of water storage (n=5). Data were submitted to two-way analysis of variance and Tukey's test (α=0.05). BAPO presented the highest DC and RP max values for both series. SAFCs presented lower DC and RP max for CQ+EDMAB-based materials. Greater yellowing was observed for SAFCs compared with CFCs, except for BAPO. Greater Wsp was observed for SAFCs compared with CFCs. The photoinitiator did not influence Wsp for CFCs, but TPO and BAPO presented the highest Wsp in SAFCs. The photoinitiator system affected differently the physical-chemical properties of CFCs and SAFCs.

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“…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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BAPO as an alternative photoinitiator for the radical polymerization of dental resins

Cited by 103 publications

References 23 publications

Evaluation of long-term bond strength and selected properties of self-adhesive resin cements

Evaluation of long-term bond strength and selected properties of self-adhesive resin cements

Influence of Photoinitiator System on Physical-Chemical Properties of Experimental Self-Adhesive Composites

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

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