The effect of curing light and chemical catalyst on the degree of conversion of two dual cured resin luting cements

Souza-Junior, Eduardo José; Prieto, Lúcia Trazzi; Soares, Giulliana Panfiglio; Dias, Carlos Tadeu dos Santos; Aguiar, Flávio Henrique Baggio; Paulillo, Luís Alexandre Maffei Sartini

doi:10.1007/s10103-010-0857-y

Cited by 21 publications

(22 citation statements)

References 35 publications

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“…This behavior could be explained by the fact that R presented a higher degree of conversion than the other resin-based cements analyzed 15, 20,27 . It has been well established that resin-based materials with a high degree of conversion and crosslink density may present limited pathways to water diffusion into the polymeric matrix network 8 .…”

Section: Discussionmentioning

confidence: 90%

Long-term degradation of resin-based cements in substances present in the oral environment: influence of activation mode

et al. 2013

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Indirect restorations in contact with free gingival margins or principally within the gingival sulcus, where the presence of organic acids produced by oral biofilm is higher, may present faster degradation of the resin-based cement pellicle.Objectives:To investigate the degradation of four resin-based cements: Rely X ARC (R), Variolink II (V), enforce (E) and All Cem (A), after immersion in distilled water (DW), lactic acid (LA) and artificial saliva (AS) and to analyze the influence of the activation mode on this response.Material and Methods:Two activation modes were evaluated: chemical (Ch) and dual (D). In the dual activation, a two-millimeter thick ceramic disk (IPS empress System) was interposed between the specimen and light-curing unit tip. Specimens were desiccated, immersed in distilled water, artificial saliva and lactic acid 0.1 M at 37ºC for 180 days, weighed daily for the first 7 days, and after 14, 21, 28, 90 and 180 days and were desiccated again. Sorption and solubility (µg/mm3) were calculated based on ISO 4049. The data were submitted to multifactor analysis of variance (MANOVA) and Tukey's HSD test for media comparisons (α=0.05).Results:Sorption was higher after immersion in LA (p<0.05) and increased significantly with time (p<0.05). Sorption was influenced by the activation mode: Ch>D (p<0.05). The lowest solubility was presented by R (p<0.05). Conclusions:Lactic acid increased the degradation of resin-based cements. Moreover, the physical component of activation, i.e., light-activation, contributed to a low degradation of resin-based cements.

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Section: Discussionmentioning

confidence: 90%

Long-term degradation of resin-based cements in substances present in the oral environment: influence of activation mode

et al. 2013

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“…The amount of light that reaches the resin cement, irradiance and energy density parameters all influence the mechanical properties of the resin cement. [19] In this study, different shades of the same resin cement were used to minimize the effect of filler ratio or particle size on volumetric shrinkage. All measurements were performed at room temperature (21 C).…”

Section: Resultsmentioning

confidence: 99%

Influence of shade of adhesive resin cement on its polymerization shrinkage

Akan

2016

Biotechnology & Biotechnological Equipment

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Resin cements have the ability to bond to the tooth structure and to several indirect restorative materials and they are available in different transparency and shades. However, polymerization shrinkage remains to be a problem that leads to gap formation at the margins of restoration, and accordingly microleakage may occur. The purpose of this study was to investigate the influence of the shade of adhesive resin cement on its polymerization shrinkage. Five shades (Group 1: universal; Group 2: brown; Group 3: clear; Group 4: opaque white; Group 5: opaque yellow) of a dual-cure composite cement system (Clearfil Esthetic Cement, Kuraray, Tokyo, Japan) were studied with 10 specimens of each shade. Volumetric shrinkages of the composite cements of these five shades were evaluated using a video-imaging device (Acu-Vol; Bisco, Inc.) by measuring the volumes before and after polymerization. Different shades displayed different volumetric shrinkages. Group 5 (2.62%) and Group 2 (3.96%) displayed the lowest and highest shrinkage percentages, respectively, with their respective shrinkage values being significantly different from those of the other groups (p < 0.05). The obtained results indicate that the shade of resin cement does affect its degree of polymerization shrinkage.

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“…The latter materials cited might be classified by the mode of polymerization, such as chemical, light, or dual curing (presenting both chemical and light-curing modes in the same product) 181920. With respect to the light-curing process, CQ is the most commonly used photoinitiator in dental resins, presenting an absorption peak at 470 nm, corresponding to the blue light spectrum 621.…”

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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The effect of curing light and chemical catalyst on the degree of conversion of two dual cured resin luting cements

Cited by 21 publications

References 35 publications

Long-term degradation of resin-based cements in substances present in the oral environment: influence of activation mode

Long-term degradation of resin-based cements in substances present in the oral environment: influence of activation mode

Influence of shade of adhesive resin cement on its polymerization shrinkage

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

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