Effect of Prewarming and/or Delayed Light Activation on Resin-Modified Glass Ionomer Bond Strength to Tooth Structures

Khoroushi, Maryam; Karvandi, TM; Sadeghi, Reza

doi:10.2341/11-137-l

Cited by 18 publications

(22 citation statements)

References 28 publications

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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%

“…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). Using single light-activation in the center of the specimen with the tip of the light-curing unit, away from the composite, is an alternative.…”

Section: Thementioning

confidence: 99%

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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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Section: Thementioning

confidence: 99%

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.

View full text Add to dashboard Cite

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“…This may be the result of enhanced micromechanical retention due to improved removal of the smear layer and dentinal plugs which allowed resin monomer (HEMA) penetration into the dentinal tubules. Additionally, EDTA does not alter the fibrillar structure of collagen, allowing the mineral content of collagen to bond with the ionic component of RMGIs (8) and since the structural support by the mineral is not missing, resin infiltration may be facilitated (9) .…”

Section: The Higher Bond Strength Of Photac Fil Quickmentioning

confidence: 99%

Effect of Application of EDTA and Delayed Light Activation on Bond Strength of Resin-Modified Glass Ionomer to Dentin

2016

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The aim of the present study was to evaluate the effect of delayed light activation and the application of EDTA on bond strength between resin modified glass ionomer and dentin. Thirty permanent sound human posterior teeth were used. The crowns were separated from the roots 1mm below cervical line and then the crowns were cut in a mesio-distal direction to obtain two halves. Samples then were embedded in self cure acrylic resin and then trimmed to create flat dentinal surfaces. Samples were divided in to three groups of 20 each according to light activation (immediate, delayed or without). Each group was subdivided into two subgroups of 10 each according to EDTA application (conditioned or non-conditioned). The restorative material was applied to a cylindrical mold (2 mm diameter and a height of 1mm) fixed on the surfaces of conditioned and non-conditioned samples then subjected to light activation either immediate, delayed or without. Samples were stored for 24h at 37°C. Shear bond strength testing was done using universal testing machine. Two teeth for each group were prepared for SEM evaluation after being divided longitudinally within the center of the restoration and the interface was examined. The results showed that delaying light activation has significantly decreased shear bond between RMGI and dentin and that the application of EDTA resulted in increase in bond strength for all groups. The lowest shear bond strength was for the conventional type while the highest one was for the immediate light cured RMGI group. The interface as revealed by the SEM showed thicker and longer resin tags in the EDTA preconditioned specimens than without conditioning. It was concluded that the use of EDTA as dentin pre conditioning was beneficial to the bond strength of both RMGI and conventional GI to dentin and that RMGI provides better dentin bonding as compared to conventional GI.

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“…On the other hand, using of G1 and resin modified glass ionomer have been used as an alternative to resin based cement [17][18][19]. Researchers showed that resin-modified glass ionomer cements have stronger bonding when compared to conventional glass ionomer bonding [20,21]. …”

Section: Introductionmentioning

confidence: 99%

Durability of Different Types of Cement on the Bonding Strength of Medicinal Biomaterial Fiber Post, In Vitro Study

Kamalak¹,

Nuaimi²

2017

J Univer Surg

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Objectives: The purpose of this study was to investigate the bond strength of medicinal biomaterial fiber post with canal wall using different types of cement. Methods:Thirty sound maxillary canines, each canal was prepared using #55 K-file and was obturated according to manufacturer instruction. After that, fiber post was cemented in the canal for each one. Specimens were divided into three groups according to types of the cements that were used for cementation: [(G1:Relay X U200), (G2:RelyX Luting), and G3:(GC lining cement)]. After cementation, all roots were stored at 100% humidity till testing. Each Sample was investigated using pushout test by placed them in a universal testing machine at a crosshead speed of 0.5 mm/min. Results:The highest Bonding strength was shown in G2 cervical level, while the lowest was shown in G3 in middle level. Results: the highest bond strength was shown in cervical level for all cements type, while the lowest was shown in the middle level. Conclusion:The highest bonding strength was observed in Rely XU 200 while the lowest was seen in lining cement G3. G1 has higher bonding strength than Conventional G3 due to micromechanical retention.

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Effect of Prewarming and/or Delayed Light Activation on Resin-Modified Glass Ionomer Bond Strength to Tooth Structures

Abstract: Bond strength might improve by delaying the light activation procedure when a cavity conditioner is used for bonding RMGI to enamel. Conversely, delaying the light activation and/or prewarming of RMGI compromises bond strength to dentin and should be avoided.

Cited by 18 publications

References 28 publications

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

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

Effect of Application of EDTA and Delayed Light Activation on Bond Strength of Resin-Modified Glass Ionomer to Dentin

Durability of Different Types of Cement on the Bonding Strength of Medicinal Biomaterial Fiber Post, In Vitro Study

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