Effect of energy density and delay time on the degree of conversion and Knoop microhardness of a dual resin cement

Mainardi, Maria do Carmo Aguiar Jordão; Giorgi, Maria Cecília Caldas; Lima, Débora Alves Nunes Leite; Marchi, Giselle Maria; Ambrosano, Gláucia María Bovi; Paulillo, Luiz Alexandre Maffei Sartini; Aguiar, Flávio Henrique Baggio

doi:10.1111/jicd.12075

Cited by 14 publications

(9 citation statements)

References 24 publications

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“…These results bear witness of a very efficient initiator system present in RelyX Unicem 2 Automix and Filtek Supreme XTE Ultra Flowable. The relative insensitivity of RelyX Unicem 2 is supported by studies on degree of conversion and hardness of RelyX ARC, an etch-and-rinse adhesive resin cement from the same manufacturer that also proved generally insensitive to changes in radiant exposure [22, 23]. Likewise, the relatively high sensitivity of Panavia F2.0 to changes in radiant exposure is in harmony with previous findings [17, 24].…”

Section: Discussionsupporting

confidence: 75%

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

Peutzfeldt

Lussi

Flury

2016

BioMed Research International

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This study investigated the influence of light-curing at high irradiances on micromechanical properties of resin cements. Three dual-curing resin cements and a light-curing flowable resin composite were light-cured with an LED curing unit in Standard mode (SM), High Power mode (HPM), or Xtra Power mode (XPM). Maximum irradiances were determined using a MARC PS radiometer, and exposure duration was varied to obtain two or three levels of radiant exposure (SM: 13.2 and 27.2 J/cm2; HPM: 15.0 and 30.4 J/cm2; XPM: 9.5, 19.3, and 29.7 J/cm2) (n = 17). Vickers hardness (H V) and indentation modulus (E IT) were measured at 15 min and 1 week. Data were analyzed with nonparametric ANOVA, Wilcoxon-Mann-Whitney tests, and Spearman correlation analyses (α = 0.05). Irradiation protocol, resin-based material, and storage time and all interactions influenced H V and E IT significantly (p ≤ 0.0001). Statistically significant correlations between radiant exposure and H V or E IT were found, indicating that high-irradiance light-curing has no detrimental effect on the polymerization of resin-based materials (p ≤ 0.0021). However, one resin cement was sensitive to the combination of irradiance and exposure duration, with high-irradiance light-curing resulting in a 20% drop in micromechanical properties. The results highlight the importance of manufacturers issuing specific recommendations for the light-curing procedure of each resin cement.

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Section: Discussionsupporting

confidence: 75%

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

Peutzfeldt

Lussi

Flury

2016

BioMed Research International

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“…A previous report showed no significant difference in root dentine bond strength values between translucent and opaque fiber posts 34) . On the other hand, the use of newly developed dual-cured or self-curing composites in fiber posts cementation is highly recommended to secure polymerization in deep parts of the canal 35) .…”

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 the light source on resin materials has been demonstrated in other studies 303132. However, in the present study, the authors would like to test and establish a suitable protocol for the resin cements tested and indicate the best dose and device to be used according to the material.…”

Section: Discussionmentioning

confidence: 93%

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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Effect of energy density and delay time on the degree of conversion and Knoop microhardness of a dual resin cement

Abstract: A high-irradiance light-curing unit allows for a reduced irradiation exposure time with a short delay time, aimed at tooth restorations using a dual-cured resin cement.

Cited by 14 publications

References 24 publications

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

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

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

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