Effect of light‐cure initiation time on polymerization efficiency and orthodontic bond strength with a resin‐modified glass‐ionomer

Thomas, J. T.; Roberts, Howard W.; Díaz, L.L.; Bradley, Thomas Gerard; Berzins, David W.

doi:10.1111/j.1601-6343.2011.01531.x

Cited by 5 publications

(6 citation statements)

References 25 publications

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“…The set material has a complicated structure based on the blended polymer and polysalt components that arise from these two reactions [18]. Competition between these two network-forming systems results in a delicate balance between them [19], meaning that delay in applying light to initiate the photochemical polymerization reaction can alter the properties of the resulting material [19,20]. Hence, it is important that the manufacturer's recommendations on the duration and timing of the light-cure step are followed closely so that the set material has optimal properties [19].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Mechanical Properties of Glass-Ionomer Dental Cements: A Review

2020

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This paper reviews the strategies that have been reported in the literature to attempt to reinforce glass-ionomer dental cements, both conventional and resin-modified. These cements are widely used in current clinical practice, but their use is limited to regions where loading is not high. Reinforcement might extend these applications, particularly to the posterior dentition. A variety of strategies have been identified, including the use of fibres, nanoparticles, and larger particle additives. One problem revealed by the literature survey is the limited extent to which researchers have used International Standard test methods. This makes comparison of results very difficult. However, it does seem possible to draw conclusions from this substantial body of work and these are (1) that powders with conventional particle sizes do not reinforce glass-ionomer cements, (2) certain fibres and certain nanoparticles give distinct improvements in strength, and (3) in the case of the nanoparticles these improvements are associated with differences in the morphology of the cement matrix, in particular, a reduction in the porosity. Despite these improvements, none of the developments has yet been translated into clinical use.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Mechanical Properties of Glass-Ionomer Dental Cements: A Review

2020

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“…Te properties such as tensile strength, water uptake, wear rates, fuoride release, erosion, and compressive strength of RMGIC materials were afected signifcantly by light curing [15][16][17]. How the curing mode afect the bonding process and thus the bonding strength remains highly speculative [18]. Terefore, shear strength between RMGIC and restorations or the dental tissue was studied in the present study.…”

Section: Discussionmentioning

confidence: 98%

Effects of Curing Mode on the Bond Strength of Resin-Modified Glass Ionomer Cements

Lin

2022

Advances in Materials Science and Engineering

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The purpose of this study was to evaluate the bond strength of resin-modified glass ionomer cements (RMGICs) with different curing mode. RelyX Luting 2(RL) and Nexus RMGI (NR) were bonded to enamel, dentin, cobalt-chromium alloy, and ceramic using light-curing and chemical-curing modes, separately. The bond strength of light curing was higher than that of chemical curing for all groups. The bond strength of RL and NR in the light-cured group was significantly higher than those in chemical curing for both enamel and cobalt-chromium alloy (P < 0.05). The most common mode of adhesive fracture was cohesive fracture. The difference of adhesive strength resulted from the difference of micromechanical interlocking of adhesive which came from the cohesive strength of RMGICs with light curing. FT-IR showed that light curing was followed by chemical curing, but the chemically cured samples could not be cured without an external light source. Thus, light curing is an essential procedure in improving bond strength when using dual-cured RMGICs in clinics.

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“…As the result, the properties of the cement would be more similar to those of the conventional glass ionomers. However, in case of immediate curing of cement, its properties would be closer to those of composite resins [4].…”

Section: Discussionmentioning

confidence: 99%

“…For instance, if photo-activation is delayed, the frequency of acid-base reactions exceeds that of polymerization reactions; thus, the final properties of the set RMGI would be more similar to those of conventional glass ionomers. However, if polymerization is initiated earlier, the final properties of the set material would be closer to those of composite resins [4]. Previous studies have reported an increase in DC following a delay in initiation of light curing, which was maximally 10 min [1,4].…”

Section: Introductionmentioning

confidence: 91%

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Effect of delayed light-curing on solubility, color stability, and opacity of Fuji II LC glass ionomer cement: original article

Nejatifard

Panahandeh²,

Ghasemi

et al. 2022

Braz. Dent. Sci.

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Objective: Resin-modified glass ionomer (RMGI) cements are among the commonly used restorative materials in low stress-bearing areas and also for temporary restorations. The competition between acid-base reactions and light polymerization reactions in delayed curing of RMGIs can affect their physical and mechanical properties, as well as their degree of conversion. Since solubility, color stability, and opacity are among the main physical properties affecting the durability and clinical service of RMGI restorations, this study aimed to assess the effect of delayed curing on solubility, color stability, and opacity of Fuji II LC RMGI. Material and Methods: This in vitro, experimental study evaluated 80 Fuji II LC RMGI specimens (10 specimens per each in 4 groups) in terms of solubility, color stability, and opacity at 6 months later. Specimens were cured immediately or were cured with 1, 5 and 10 min delay. Results: Maximum solubility and minimum change in opacity and color stability at 6 months were noted in the group with delayed curing by 10 min. A significant difference was noted in the solubility of specimens cured after 10 min and 1 min. Significant differences were also noted in the opacity and color stability of specimens cured after 10 min and all other groups (P < 0.05). Conclusion: Delayed curing by 1 min decreased the solubility of RMGI specimens compared with immediate curing or curing after 5 min. Although this difference did not reach statistical significance. Color stability and changes in opacity are mainly influenced by the acid-base reactions rather than polymerization reactions.

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Effect of light‐cure initiation time on polymerization efficiency and orthodontic bond strength with a resin‐modified glass‐ionomer

Abstract: Delay in light-curing may reduce polymerization efficiency and alter the structure of the RMGI, but orthodontic shear bond strength does not appear to be compromised.

Cited by 5 publications

References 25 publications

Enhancing the Mechanical Properties of Glass-Ionomer Dental Cements: A Review

Enhancing the Mechanical Properties of Glass-Ionomer Dental Cements: A Review

Effects of Curing Mode on the Bond Strength of Resin-Modified Glass Ionomer Cements

Effect of delayed light-curing on solubility, color stability, and opacity of Fuji II LC glass ionomer cement: original article

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