Effect of chemical structure on degree of conversion in light-cured dimethacrylate-based dental resins

Sideridou, Irini D.; Tserki, V.; Παπαναστασίου, Γεώργιος

doi:10.1016/s0142-9612(01)00308-8

Cited by 694 publications

(780 citation statements)

References 27 publications

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“…BFP is a flowable material based on Bis-GMA and TEGDMA. As it was previously mentioned, TEGDMA has high reactivity and smaller molecular size which means high double bond concentration resulting into more volume loss after curing of the material [51]. This result was in agreement with others in which it was found that that the viscoelastic properties play an important role in stress development in addition to the monomer properties of the material [2,13,[52][53][54].…”

Section: Discussionsupporting

confidence: 91%

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

2016

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Shrinkage-strainShrinkage-stress Strain rate Modulus of elasticity Bulk-fill a b s t r a c tObjectives. To investigate a set of resin-composites and the effect of their composition on polymerization shrinkage strain and strain kinetics, shrinkage stress and the apparent elastic modulus.Methods. Eighteen commercially available resin-composites were investigated. Three specimens (n = 3) were made per material and light-cured with an LED unit (1200 mW/cm 2 ) for 20 s. The bonded-disk method was used to measure the shrinkage strain and Bioman shrinkage stress instrument was used to measure shrinkage stress. The shrinkage strain kinetics at 23 • C was monitored for 60 min. Maximum strain and stress was evaluated at 60 min. The shrinkage strain rate was calculated using numerical differentiation. Significance. The nature of the monomer system determines the amount of the bulk contraction that occurs during polymerization and the resultant stress. Higher values of shrinkage strain and stress were demonstrated by the investigated flowable materials. The bulk-fill materials showed comparable result when compared to the traditional resin-composites.

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Section: Discussionsupporting

confidence: 91%

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

2016

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“…Moreover, both LuxaCore  -Dual and FluoroCore  2 present UDMA in their composition, while Rely X ARC composition is based on TEGDMA and Bis-GMA monomers. Some studies have demonstrated that UDMA-based composites have increased monomer conversion 24 and improved mechanical properties in comparison to Bis-GMA/ TEGDMA composites. [25][26][27] It is possible that the differences in filler content among materials may have contributed to the differences in KHN values when resin-based materials were allowed to self-cure.…”

Section: Discussionmentioning

confidence: 99%

Effect of curing mode on the hardness of dual-cured composite resin core build-up materials

et al. 2010

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This study evaluated the Knoop Hardness (KHN) values of two dual-cured composite resin core build-up materials and one resin cement exposed to different curing conditions. Two dual-cured core buildup composite resins (LuxaCore  -Dual, DMG; and FluoroCore  2, Dentsply Caulk), and one dual-cured resin cement (Rely X ARC, 3M ESPE) were used in the present study. The composite materials were placed into a cylindrical matrix (2 mm in height and 3 mm in diameter), and the specimens thus produced were either light-activated for 40 s (Optilux 501, Demetron Kerr) or were allowed to self-cure for 10 min in the dark (n = 5). All specimens were then stored in humidity at 37°C for 24 h in the dark and were subjected to KHN analysis. The results were submitted to 2-way ANOVA and Tukey's post-hoc test at a pre-set alpha of 5%. All the light-activated groups exhibited higher KHN values than the self-cured ones (p = 0.00001), regardless of product. Among the self-cured groups, both composite resin core build-up materials showed higher KHN values than the dual-cured resin cement (p = 0.00001). LuxaCore  -Dual exhibited higher KHN values than FluoroCore  2 (p = 0.00001) when they were allowed to self-cure, while no significant differences in KHN values were observed among the light-activated products. The results suggest that dual-cured composite resin core build-up materials may be more reliable than dual-cured resin cements when curing light is not available.

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“…Con el fin de disminuir la absorción de agua, se han propuesto otros sistemas entre los que se incluyen los análogos químicos del uretano dimetacrilato (udma), que poseen un grupo fenoximetil en la porción periférica o central como grupo alifático [23], [24], que al ser comparado con los sistemas habituales udma, reducen entre un 10-30% la absorción de agua; sin embargo, se ha reportado como efecto secundario la disminución de la resistencia comprensiva [25].…”

Section: Discussionunclassified

Efectos sobre microdureza y grado de conversión de dos tipos de resinas sometidas a tratamientos de pospolimerización

Lapesqueur¹,

Surriaga²,

Masache³

et al. 2015

Rev. nac. odontol.

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Objetivo:evaluar la microdureza y el grado de conversión después de diferentes técnicas poscurado en dos tipos de resinas compuestas. Materiales y métodos: se realizaron 36 cuerpos de prueba con 12 mm de diámetro y 4 mm de altura, con dos resinas: Filtek z350 y Ena Miscerium. Después de la confec-ción, los cuerpos de prueba se llevaron al microduremetro y a espectroscopia de infrarrojo, y fueron sometidos a cuatro procesos de pospolimerización: agua en ebullición, microonda, calor seco, autoclave y horno gradia. Resultados: se hizo análisis estadístico por medio de Anova de dos factores con postest Tukey por resina evaluada, se presentan media y desviación estándar, los valores de grado de conversión muestran un gran aumento en la resina Ena comparado con el grupo control (63,81%), cuando es realizado pospolimerización con calor seco (89,02%) y una gran disminución cuando es realizado con agua en ebullición (36,41%). Con-clusiones: el proceso de curado posterior por microondas y autoclave aumenta los valores de microdureza y grado de conversión, y el agua destilada a temperaturas altas disminuye la microdureza de la superficie de las resinas compuestas

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Effect of chemical structure on degree of conversion in light-cured dimethacrylate-based dental resins

Cited by 694 publications

References 27 publications

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

Effect of curing mode on the hardness of dual-cured composite resin core build-up materials

Efectos sobre microdureza y grado de conversión de dos tipos de resinas sometidas a tratamientos de pospolimerización

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