Resin-modified Glass-ionomer Setting Reaction Competition

Berzins, David W.; Abey, S.; Costache, Marius C.; Wilkie, Charles A.; Roberts, Howard W.

doi:10.1177/0022034509355919

Cited by 105 publications

(103 citation statements)

References 35 publications

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“…in attempt to improve mechanical properties, decrease setting time, and reduce moisture sensitivity of glass ionomer materials. 2,3,4 Hybrid ionomer were used for restorations on low-stressbearing areas and recommended for patients with high risk caries more esthetic than glass ionomers due to the resin content. 2,5,6 Hybrid ionomer setting reactions were by the acid base reaction between Fluro aluminosilicate glass powder and acid liquid and polymerization reaction with chemical activator or beam.…”

Section: Introductionmentioning

confidence: 99%

Surface Hardness of Hybrid Ionomer with Different Curing Time (In Vitro Study)

2017

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Objective: The aim of this study was to evaluate the surface hardness of hybrid ionomer with different curing times (20, 30, 40, and 50 seconds). Methods:This was an experimental laboratory with posttest only group design. Twenty-four disk shape hybrid ionomer specimens with a diameter of 5 mm and 2 mm in thickness were prepared and polymerized with Quartz Tungsten Halogen (QTH) for 20, 30, 40, and 50 seconds as group 1, 2, 3, and 4 respectively. All samples were immersed in distilled water under 37°C temperature for 24 hours as initial treatment. Surface hardness test was done using Vickers Hardness Test with load 50 gf for 20 second. The Data was analyzed with one way ANOVA (p ≤ 0.05).Results: Using one way anova test (p ≤ 0.05) shows the mean and standard deviation of the group 1 is 25,900 ± 2,5659VHN; group 2 is 29,800 ± 1,1983 VHN; group 3 is 31,283 ± 0,5037 VHN; group 4 is 36, 183 ± 2,3430 VHN and the obtained value p = 0.000 (p ≤ 0.05).The mean values and standard deviation were 25.900 ± 2.5659 VHN; 29.800 ± 1.1983 VHN; 31.283 ±0.5037 VHN; 6.183 ± 2.3430 VHN for group 1, 2, 3, and 4 respectively. Statistic analyzed showed a significant different among groups with p value =0.000 (p < 0.05). Conclusion:There are significant differences in surface hardness of hybrid ionomer with different curing time (20, 30,40, and 50 seconds). The longer curing time will increase the surface hardness of hybrid ionomer.

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Section: Introductionmentioning

confidence: 99%

Surface Hardness of Hybrid Ionomer with Different Curing Time (In Vitro Study)

2017

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“…Los ionómeros de vidrio resino modificados constituyen uno de los últimos materiales incorporados como bases intermedias, los cuales fueron introducidos en el mercado entre los años 1993 y 1994, pudiendo ser utilizados como materiales de restauración definitiva. Su composición, compatibilidad bioló-gica y acción adhesiva a la dentina y al esmalte son muy similares a los ionómeros convencionales [18]. Sus mejores propiedades mecánicas le permiten ser grabado [16][17][18][19].…”

Section: Introductionunclassified

“…Su composición, compatibilidad bioló-gica y acción adhesiva a la dentina y al esmalte son muy similares a los ionómeros convencionales [18]. Sus mejores propiedades mecánicas le permiten ser grabado [16][17][18][19]. La sensibilidad a corto plazo por el agua resulta del ablandamiento de la superficie y, como consecuencia, una baja resistencia al desgaste, lo que limita el potencial del cemento ionómero de vidrio para las aplicaciones dentales [13].…”

Section: Introductionunclassified

Cambios en la resistencia compresiva del ionómero de vidrio al ser grabado con ácido ortofosfórico

et al. 2013

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Resumen. Introducción: los ionómeros de vidrio resinomodificados son materiales usados como base intermedia en procedimientos dentales. El objetivo fue evaluar los cambios que ocurren en la resistencia compresiva de un ionómero de vidrio resinomodificado después de ser grabado con ácido ortofosfórico al 37%. Materiales y métodos: Estudio experimental in vitro. Se prepararon 40 moldes termoformados, 20 muestras en el grupo experimental (ge) a las que se les aplicó ácido fosfórico durante 15 s y fueron lavadas durante 40 s, y 20 muestras en el grupo control (cg). Diez muestras de cada grupo se almacenaron por 48 horas al baño maría. Todas las muestras fueron sometidas a una fuerza compresiva usando una máquina universal de prueba. El análisis se realizó en el programa estadístico spss versión 19. Se realizaron las pruebas de Tukey y Anova. Resultados: hubo diferencias estadísticamente significativas entre los grupos con y sin ácido a los 15 minutos con respecto a los grupos con y sin ácido a las 48 horas (P = 0,01). Conclusiones: la aplicación de ácido fosfórico al 37% no afecta la resistencia compresiva de los ionómeros de vidrio resinomodificados. La reducción en la resistencia compresiva podría estar asociada al almacenamiento en medio húmedo.Palabras clave: ácido ortofosfórico, base intermedia, fuerza compresiva, ionómero de vidrio resino modificado. Changes in the Resistance to Compression of Resin-modified Glass after Etching with Orthophosphoric AcidAbstract. Introduction: Resin-modified glass ionomers are materials used as an intermediate base in some dental procedures. Our objective was to evaluate the changes that occur in resistance to compression in a light-cured resin-modified glass ionomer after etching it with 37% orthophosphoric acid. Materials and methods: We carried out an experimental study in vitro. We prepared forty thermoformed molds. The control group (cg) consisted of 20 samples to which no phosphoric acid was applied and the experimental group (ge) included 20 samples that were etched with 37% orthophosphoric acid for 15 seconds and rinsed with water for 40 seconds. All samples were subjected to a compressive test using an Instron universal testing machine. 10 samples of each group were stored in a water bath. For the analysis we used spss version 19. Tukey and Anova tests were performed. Results: There were statistically significant differences between the groups with and without acid at 15 minutes with respect to the groups with and without acid at 48 hours. (P = 0.01). Conclusions: The application of 37% phosphoric acid for 15 seconds does not affect the resistance to compression strength of a lightcured resin-modified glass ionomer. Reduction in resistance to compression might be associated with storing the samples in a wet environment.Keywords: orthophosphoric acid, intermediate base, resistance to compression, light-cured resin-modified glass ionomer. Mudanças na resistência compreensiva do ionômero de vidro ao ser gravado com ácido ortofosfóricoResumo. Introdução: os ionômeros de vi...

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“…RMGIs contain components of glass ionomers (fluoro-aluminosilicate glasses and polyacrylic acid) as well as resin composites (photo or chemical initiators and methacrylate monomers). 10 Due to their hybrid nature, RMGIs bond to dentin through both an ionic bond between polyacrylic acid and hydroxyapatite and mechanical interlocking with collagen and the resin monomer. 11 The initiation of this bond can be attributed to the various methods of polymerization of the RMGIs.…”

Section: Introductionmentioning

confidence: 99%

“…12 Recent studies have shown the acid-base and photo-initiated free-radical reactions inhibit each other, with photopolymerization of RMGIs reducing the acid-base reaction. 10,13 Another recent study concluded that the acid-base induced chemical interaction between RMGI and dentin is the main mechanism of bonding with RMGI. 14 Therefore, it is hypothesized that RMGIs allowed to polymerize without light activation will develop bond strength through the ionic bonding between RMGIs and dentin and should therefore have an equivalent or higher bond strength than light-cured RMGIs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Light Activation on Resin-modified Glass Ionomer Shear Bond Strength

Lawson

Çakır²,

Beck³

et al. 2012

Operative Dentistry

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SUMMARY Objective Recent studies confirmed that resin-modified glass ionomers (RMGIs) set on the basis of two competing mechanisms, an acid-base reaction and a light-activated resin polymerization. This study evaluated the effect of the setting mechanism on bond strength by measuring the shear bond strength of three RMGIs to dentin with and without light activation. Methods Sixty human molars were ground to midcoronal dentin and randomly divided into six even groups: 1) Ketac Nano (KN), 2) KN without light cure (woLC), 3) Fuji Filling LC (FF), 4) FF woLC, 5) Fuji II LC (FII), and 6) FII woLC. The dentin surfaces of the specimens were conditioned/primed according to the manufacturers' instructions. A 1.54-mm diameter plastic tube was filled with RMGI material and affixed to the dentin surface. Groups 1, 3, and 5 were light cured for 20 seconds, and groups 2, 4, and 6 were immediately placed in a damp dark box with no light curing at 37°C for 24 hours. Shear bond strength testing was performed in an Instron device at 1 mm/min. Data were analyzed with a one-way analysis of variance (ANOVA) and Tukey/Kramer test (α=0.05). Results Mean ± standard deviation shear bond strength values (MPa) are: 7.1 ± 4.2 (KN), 11.7 ± 3.9 (FF), 10.2 ± 3.2 (FF woLC), 12.5 ± 5.1 (FII), and 0.3 ± 0.4 (FII woLC). Two KN, all KN woLC, and seven FII woLC specimens debonded before testing. Tukey/Kramer analysis revealed no significant differences in bond strength between the three light-cured RMGIs. KN and FII showed significantly lower bond strength without light cure, but no significant difference was observed between FF and FF woLC. Conclusions The results of this study strongly suggest that light activation is necessary to obtain optimal bond strength between RMGI and dentin. FF may contain components that chemically activate resin polymerization. Clinically, KN and FII need to be light cured after placement of these RMGIs.

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Resin-modified Glass-ionomer Setting Reaction Competition

Cited by 105 publications

References 35 publications

Surface Hardness of Hybrid Ionomer with Different Curing Time (In Vitro Study)

Surface Hardness of Hybrid Ionomer with Different Curing Time (In Vitro Study)

Cambios en la resistencia compresiva del ionómero de vidrio al ser grabado con ácido ortofosfórico

Effect of Light Activation on Resin-modified Glass Ionomer Shear Bond Strength

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