Efficiency of Dual-Cured Resin Cement Polymerization Induced by High-Intensity LED Curing Units Through Ceramic Material

Watanabe, Hidehiko; Kazama, Re; Asai, T; Kanaya, F; Ishizaki, Hiroko; Fukushima, Masayoshi; Okiji, Takashi

doi:10.2341/13-357-l

Cited by 29 publications

(38 citation statements)

References 43 publications

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“…This finding corroborates numerous previous studies on degree of conversion and mechanical properties of not only light-cured, resin-based materials [1–7], but also of dual-curing resin cements [17, 19, 20]. The fact that the dual-curing resin cements reacted similarly to purely light-curing, flowable resin composite reflects that most dual-curing resin cements rely to a large extent on effective light-curing [10, 16, 17, 21].…”

Section: Discussionsupporting

confidence: 92%

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: 92%

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

Peutzfeldt

Lussi

Flury

2016

BioMed Research International

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“…Studies have reported that the light activation of dual-cured resin cement through the indirect restorations resulted in lower bond strength to dentin, even when used in combination with dual-cured adhesive systems (1,5,7,9). These bond strength reductions are due to the light attenuation caused by indirect restorations, which significantly affect the DC and hardness of the resin cements (1,2,6,8,11,12). Although resin cements are dualcure materials, the self-curing components have not been able to compensate the low light irradiance and produce the same monomer conversion as the light-activated groups (9).…”

Section: Discussionmentioning

confidence: 99%

“…Curing light attenuation compromises the mechanical and adhesive properties of the resin cement because the low light intensity that reaches the resin cement is not sufficient to produce a high degree of conversion (DC) (5)(6)(7)(8).…”

Section: Introductionmentioning

confidence: 99%

Indirect Restoration Thickness and Time after Light-Activation Effects on Degree of Conversion of Resin Cement

et al. 2015

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This study evaluated the effects of indirect restorative materials, curing conditions and time on the degree of conversion (DC) of a dual-cured resin cement using infrared spectroscopy. The resin cement (RelyX Unicem 2, 3M ESPE) was applied to the diamond surface of a horizontal attenuated-total-reflectance unit and activated using one of following conditions: self-cure, direct light exposure, light exposure through indirect restorative materials (resin nano-ceramic: Lava Ultimate, 3M ESPE or feldspathic ceramic: Vita Blocks Mark II, Vita Zahnfabrik). Four thicknesses (0.5, 1.0, 1.5 or 2.0 mm) of each indirect material were analyzed, and the light-activation was performed using a blue LED light. Data (n=5) were analyzed by three-way ANOVA, Tukey's post hoc and Dunnett's tests (a=5%). No significant differences in DC were observed between indirect materials of similar thickness. All groups exhibited higher DC after 10 min than after 5 min. At both times points, the self-cure group exhibited significantly lower DC than all the light exposure groups. Only when the overlying indirect restoration had a thickness of 2 mm did DC decrease significantly. The presence of a thick, indirect restoration can decrease the DC of resin cement. DC after 10 min was higher than after 5 min. The self-cure mode yielded lower DC than the light-activating one.

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“…Some alternatives included light-emitting diodes (LED) and plasma arcs, with energy emission at 1,600 mW/cm 2 and 2,000 mW/cm 2 , respectively, reducing light activation time (7). Even though there is no clear evidence regarding differences in bonding failure in the three light activation systems, most studies highlight the remarkable reduction in activation time when plasma arcs and LED are used, instead of halogen lamps, for bonding of the brackets to dental surfaces (7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Light Activation and Thermocycling Methods on the Shear Bond Strength of Brackets Bonded to Porcelain Surfaces

et al. 2020

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The present study was evaluated the effect of different light activation and thermocycling methods on the shear bond strength (SBS) and on the adhesive remnant index (ARI) of metal brackets bonded to feldspathic ceramic. Hundred metal brackets were bonded to 20 porcelain cylinders, divided into four groups (n=25) based on light activation and thermocycling processes. The cylinders were etched with 10% hydrofluoric acid for 60 s and coated with two layers of silane. The brackets were bonded with Transbond XT composite resin. Light activation in Groups 1 and 3 was performed during 3 s using the VALO Ortho Cordless appliance with irradiance 3,200 mW/cm2 and in Groups 2 and 4 for 40 s using Optilight Max appliance with irradiance 1,200 mW/cm². The samples were stored in deionized water at 37°C for 24 h and the samples from Groups 1 and 2 were submitted to the SBS test at a rate of 1 mm/min, whereas the samples from Groups 3 and 4 were submitted to 7,000 thermal cycles (5°/55°C) before to the SBS test. The data were assessed by two-way analysis of variance and by Tukey’s test (a=0.05). No significant difference was observed between SBS means in the different light activation devices used. The samples subjected to thermocycling revealed lower SBS values (p≤0.05). There was predominance of score 0 for ARI in all groups. Therefore, the different light activation methods did not interfere in SBS, but thermocycling reduced SBS.

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Efficiency of Dual-Cured Resin Cement Polymerization Induced by High-Intensity LED Curing Units Through Ceramic Material

Cited by 29 publications

References 43 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

Indirect Restoration Thickness and Time after Light-Activation Effects on Degree of Conversion of Resin Cement

Light Activation and Thermocycling Methods on the Shear Bond Strength of Brackets Bonded to Porcelain Surfaces

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