Polymerization stress, shrinkage and elastic modulus of current low-shrinkage restorative composites

Boaro, Letícia Cristina Cidreira; Gonçalves, Flávio de Oliveira; Guimarães, T.C.; Ferracane, Jack L.; Versluis, Antheunis; Braga, Roberto Ruggiero

doi:10.1016/j.dental.2010.08.003

Cited by 210 publications

(182 citation statements)

References 34 publications

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“…Once the resin matrix determines the reduction in volume when the dense cross-linked polymer network is created, 16 these RCs are expected to develop low shrinkage during polymerization. While the silorane-based RC has been exhaustively evaluated regarding its shrinkage values 14,17 and mechanical properties, 18,19 little information is available in the literature concerning the shrinkage and mechanical properties of these highly filled LSRCs. 17 The analysis of flexural strength (FS) and flexural modulus (FM), along with volumetric shrinkage (VS), is crucial in predicting the clinical success of composites.…”

Section: Introductionmentioning

confidence: 99%

Silorane- and high filled-based"low-shrinkage" resin composites: shrinkage, flexural strength and modulus

et al. 2013

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Silorane-and high filled-based "lowshrinkage" resin composites: shrinkage, flexural strength and modulus Abstract: This study compared the volumetric shrinkage (VS), flexural strength (FS) and flexural modulus (FM) properties of the low-shrinkage resin composite Aelite LS (Bisco) to those of Filtek LS (3M ESPE) and two regular dimethacrylate-based resin composites, the microfilled Heliomolar (Ivoclar Vivadent) and the microhybrid Aelite Universal (Bisco). The composites (n = 5) were placed on the Teflon pedestal of a videoimaging device, and VS was recorded every minute for 5 min after 40 s of light exposure. For the FS and FM tests, resin discs (0.6 mm in thickness and 6.0 mm in diameter) were obtained (n = 12) and submitted to a piston-ring biaxial test in a universal testing machine. VS, FS, and FM data were submitted to two-way repeated measures and one-way ANOVA, respectively, followed by Tukey's post-hoc test (α = 5%). Filtek LS showed lower VS than did Aelite LS, which in turn showed lower shrinkage than did the other composites. Aelite Universal and Filtek LS exhibited higher FS than did Heliomolar and Aelite LS, both of which exhibited the highest FM. No significant difference in FM was noted between Filtek LS and Aelite Universal, while Heliomolar exhibited the lowest values. Aelite LS was not as effective as Filtek LS regarding shrinkage, although both lowshrinkage composites showed lower VS than did the other composites. Only Filtek LS exhibited FS and FM comparable to those of the regular microhybrid dimethacrylate-based resin composite.

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Section: Introductionmentioning

confidence: 99%

Silorane- and high filled-based"low-shrinkage" resin composites: shrinkage, flexural strength and modulus

et al. 2013

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“…The acid cation attacks oxirane rings, causing the cleavage and opening of these rings that compensate for loss of volume due to covalent bonds among the atoms 11) . This mechanism allows a reduction in polymerization shrinkage [18][19][20][21] , and according to some studies, siloranes also decrease polymerization stress 19,22) .…”

Section: Discussionmentioning

confidence: 82%

Effect of thermo-mechanical load cycling on silorane-based composite restorations

et al. 2012

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The aim of this study was to compare the formation of marginal gaps after thermo-mechanical load cycling, between siloranebased and methacrylate-based restorations. Standardized class II cavities were made in 10 permanent human third molars that were restored with the adhesive system Clearfil SE Bond+composite Filtek Z-350 (Methacrylates) and with the composite bonding Filtek P90+P90 (Siloranes), respectively. After 24 h of storage in 100% humidity at 37°C, the restoration margins were stained, photographed, and evaluated. The gap length was calculated as the percentage of the total length of the margins. Thereafter, the specimens were tested by a thermo-mechanical machine and the marginal gap formation of the specimens was re-evaluated. The results were expressed as percentages of gaps and were submitted to a Mann Whitney test at 5% level of significance. Methacrylates showed a statistically significant higher percentage of gaps than Siloranes, both before and after cycling.

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“…76 In fact, one in vitro study evaluating different brands of low shrinkage composites has demonstrated that the lowest shrinking material did not necessarily present the lowest polymerization stress. 32 For example, the silorane material presented significantly reduced shrinkage in relation to a methacrylate-based material from the same manufacturer, but statistically similar stress values, which was attributed to the much higher elastic modulus reached by the low-shrinkage material. Similarly, low shrink materials which presented lower stress also had much lower modulus.…”

Section: Modifications In the Restorative Composite Formulationmentioning

confidence: 82%

“…Similarly, low shrink materials which presented lower stress also had much lower modulus. 32 This evidences the complexity of this subject, and helps partially explain why to date no clinical evidence exists that low-shrinking materials perform significantly better than conventional ones in terms of improving restoration longevity. 77,78,79 In the clinical situation, the presence of biofilm and the vast variation in patient's hygiene and dietary habits complicates matters even further.…”

Section: Modifications In the Restorative Composite Formulationmentioning

confidence: 88%

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Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?

et al. 2017

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Polymerization shrinkage stress of resin-based materials have been related to several unwanted clinical consequences, such as enamel crack propagation, cusp deflection, marginal and internal gaps, and decreased bond strength. Despite the absence of strong evidence relating polymerization shrinkage to secondary caries or fracture of posterior teeth, shrinkage stress has been associated with postoperative sensitivity and marginal stain. The latter is often erroneously used as a criterion for replacement of composite restorations. Therefore, an indirect correlation can emerge between shrinkage stress and the longevity of composite restorations or resin-bonded ceramic restorations. The relationship between shrinkage and stress can be best studied in laboratory experiments and a combination of various methodologies. The objective of this review article is to discuss the concept and consequences of polymerization shrinkage and shrinkage stress of composite resins and resin cements. Literature relating to polymerization shrinkage and shrinkage stress generation, research methodologies, and contributing factors are selected and reviewed. Clinical techniques that could reduce shrinkage stress and new developments on low-shrink dental materials are also discussed.

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Polymerization stress, shrinkage and elastic modulus of current low-shrinkage restorative composites

Cited by 210 publications

References 34 publications

Silorane- and high filled-based"low-shrinkage" resin composites: shrinkage, flexural strength and modulus

Silorane- and high filled-based"low-shrinkage" resin composites: shrinkage, flexural strength and modulus

Effect of thermo-mechanical load cycling on silorane-based composite restorations

Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?

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