Impact of immediate and delayed light activation on self-polymerization of dual-cured dental resin luting agents

Moraes, Rafael R.; Faria-e-Silva, André Luís; Ogliari, Fabrício Aulo; Correr-Sobrinho, Lourenço; Demarco, Flávio Fernando; Piva, Evandro

doi:10.1016/j.actbio.2009.01.030

Cited by 84 publications

(85 citation statements)

References 22 publications

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“…3 The delay period before light activation significantly reduced the RP max for Enforce to a value statistically similar to the reaction rate of the cements tested in self-cure mode. RelyX ARC showed statistically similar RP max in all three curing modes, and Panavia F showed the highest values for delayed light activation.…”

Section: Discussionmentioning

confidence: 89%

“…Nevertheless, some dual-cured resin cements are dependent primarily on light activation, and therefore a somewhat lower degree of conversion is expected when exposed to low irradiance or when light from the curing unit is not available at all. [2][3][4][5][6] Other studies found similar properties between dual-cure resin cements tested after light activation or in the self-cure mode. 7,8 It has been hypothesized that light activation may negatively affect the selfcuring mechanism.…”

Section: Introductionmentioning

confidence: 84%

“…The rationale is that the rapid formation of a cross-linked polymer on exposure to light would lead to entrapment of the reactive species, including activators and initiators needed for the selfcure reaction. 3,[9][10][11][12] Thus, a delay period between cement mixing and light activation would increase total free-radical concentration, which would lead to a higher overall degree of conversion, ultimately improving the cement's mechanical properties. 3,13 Unfortunately, a higher degree of conversion is also related to an increase in polymerization shrinkage stress.…”

Section: Introductionmentioning

confidence: 99%

“…3,[9][10][11][12] Thus, a delay period between cement mixing and light activation would increase total free-radical concentration, which would lead to a higher overall degree of conversion, ultimately improving the cement's mechanical properties. 3,13 Unfortunately, a higher degree of conversion is also related to an increase in polymerization shrinkage stress. [14][15][16] If stress exceeds the bond strength between the dental substrate and the adhesive system, a contraction gap will be formed, [17][18][19][20] jeopardizing the longevity of the restoration.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Immediate or Delayed Light Activation on Curing Kinetics and Shrinkage Stress of Dual-Cure Resin Cements

Faria-e-Silva¹,

Boaro²,

Braga³

et al. 2011

Operative Dentistry

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A Faria-e-Silva L Boaro R Braga E Piva V Arias L Martins Clinical RelevanceUnder clinical conditions, delayed light activation of dual-cured resin cements may be advantageous in order to reduce shrinkage stress. SUMMARYObjectives: This study evaluated the effect of light activation (absence, immediate, or delayed) on conversion kinetics and polymerization stress of three commercial dual-cured resin cements (Enforce, RelyX ARC, and Panavia F). Methods: Degree of conversion (DC) was monitored for 30 minutes using real-time nearFourier transform infrared spectroscopy. The cement was mixed, placed on the spectrometer sample holder, and light activated either immediately or after five minutes (delayed light activation). When no light activation was performed, the materials were protected from light exposure (control). DC was evaluated at five and 30 minutes postmixture. Maximum rates of polymerization (Rp max ) were obtained from the first derivative of the DC vs time curve. Polymerization stress was monitored for 30 minutes in 1-mm-thick specimens inserted between two cylinders attached to a uni-

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Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Immediate or Delayed Light Activation on Curing Kinetics and Shrinkage Stress of Dual-Cure Resin Cements

Faria-e-Silva¹,

Boaro²,

Braga³

et al. 2011

Operative Dentistry

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“…Although the ISO 4049 specification is largely used for testing composites that are lightcured only, the technique recommended for specimen preparation hinders the evaluation of the possible effects of light-activation moment on mechanical properties of dual-cured resin-based materials (MORAES, et al 2009;FARIA-E-SILVA, et al 2011;KHOROUSHI, et al 2012;FARIA-E-SILVA, et al 2012;SOUZA, et al 2013;FARIA-E-SILVA, et al 2014) By the time dual-cured materials are inserted into the mold, the polymerization reaction has already started via chemical activation. Therefore, each light-activation is performed over areas of the polymer, presenting with differences in the degrees of C=C conversion impairing the standardization of time for light-activation (FARIA-E-SILVA, et al 2012;KHOROUSHI, et al 2012).…”

Section: Thementioning

confidence: 99%

An alternative specimen preparation technique for 3-point bending tests on dual-cured dental resin cements

Oliveira¹,

Barreto²,

Oliveira-Neto³

et al. 2016

Biosci. J.

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ABSTRACT:The proper mechanical properties of resin cements are essential to the longevity of indirect restoration, whereas the 3-point bending test is recommended for measuring the flexural strength. The ISO 4049 specification requires light-curing of specimens in three consecutive points; however, this approach cannot be used for dual-cured resin cements. The aim of this study was to investigate the effect of two different specimen preparation techniques on the flexural strength and elastic modulus of experimental dual-cured resin cements immediately or 5 after minutes light curing. Experimental dual-cured resin cements were formulated, and the specimens of these cements were confectioned with the dimension of ISO 4049 specification. Light-activation was performed at one or three points immediately or 5 minutes after the insertion of cement into the matrix (n=7), resulting in four experimental conditions (2 methods × 2 moments of light-activation). The three-point bending test was performed and the values of the flexural strength and elastic modulus were recorded. Data were individually analyzed using 2-way ANOVA followed by the Tukey's post hoc test (P<0.05). Regardless of the points of light-activation, the specimens that were light-cured at 3 points showed the highest values of flexural strength. Only for light-activation at 1 point did the time before the light-activation affect the elastic modulus, whereas delayed light-activation had the highest values. In conclusion, the number of lightcuring points on specimen preparation for the 3-point bending test seems to affect the mechanical properties of dual-cured resin cements.

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Properties of particulate resin‐luting agents with phosphate and carboxylic functional methacrylates as coupling agents

Habekost¹,

Camacho²,

Lima³

et al. 2012

J of Applied Polymer Sci

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This study investigated properties of resin‐luting agents using silane [3‐(trimethoxysilyl)propyl methacrylate (TSPM)], phosphoric acid methacrylate (PAM) [mono/bis(methacryloyloxyethyl (di)hydrogen phosphate)], or carboxylic acid methacrylate (CAM) [mono‐2‐(methacryloyloxy)ethyl maleate] as coupling agents between the inorganic and organic phases. Ba‐B‐Al‐Si microparticles (3 μm) and SiO2 nanoparticles (7 nm) were coated with TSPM, PAM, or CAM (control = no filler coating). A Bis‐GMA/triethyleneglycol dimethacrylate comonomer was loaded with 60% mass of inorganic fillers. The properties evaluated were degree of CC conversion (DC), flexural strength (σ), and modulus (Ef), Knoop hardness number (KHN), and film thickness (FT). Dispersion/interaction of the particles with the resin phase was assessed by scanning electron microscopy (SEM). No significant differences in DC were observed. For σ and Ef, TSPM > CAM > Control > PAM. For KHN, TSPM > CAM > PAM = Control. For FT, TSPM < Control < CAM < PAM. The SEM analysis revealed clustering of nanoparticles for all groups and better organic–inorganic phases interaction for TSPM and CAM. The use of TSPM generated agents with improved properties as compared with the acidic methacrylates, with CAM showing better performance than PAM. The use of PAM generated agents with properties usually poorer compared with the material with no coupling agent. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Impact of immediate and delayed light activation on self-polymerization of dual-cured dental resin luting agents

Cited by 84 publications

References 22 publications

Effect of Immediate or Delayed Light Activation on Curing Kinetics and Shrinkage Stress of Dual-Cure Resin Cements

Effect of Immediate or Delayed Light Activation on Curing Kinetics and Shrinkage Stress of Dual-Cure Resin Cements

An alternative specimen preparation technique for 3-point bending tests on dual-cured dental resin cements

Properties of particulate resin‐luting agents with phosphate and carboxylic functional methacrylates as coupling agents

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