Setting characteristics and cavity adaptation of low-shrinking resin composites

Papadogiannis, D.; Kakaboura, Afrodite; Palaghias, Georgios; Εliades, George

doi:10.1016/j.dental.2009.06.022

Cited by 96 publications

(85 citation statements)

References 21 publications

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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: 79%

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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Section: Discussionmentioning

confidence: 79%

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

et al. 2012

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“…Its high filler content explains the high moduli values that were obtained, which is probably the reason for its high wear resistance found in one study 18) and possibly other mechanical properties. However, despite its low shrinkage this material was found to show similar marginal adaptation to materials that shrink more 19) . This phenomenon was attributed to other factors that influence the adaptation of composites, namely stiffness and viscosity, which is affirmed from the current findings.…”

Section: Discussionmentioning

confidence: 81%

“…In the case of EL, the absence of the diluent monomer TEGDMA is possibly the reason this material has been found to possess a relatively low degree of cure (%DC) in the early stages of polymerization 19) which is associated with a decreased polymerization shrinkage strain 20) . However, a low %DC can have a detrimental effect on the mechanical properties of a composite resin.…”

Section: Discussionmentioning

confidence: 99%

Viscoelastic properties of low-shrinking composite resins compared to packable composite resins

et al. 2011

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The aim of this study was to evaluate the viscoelastic properties of novel low-shrinking composites and compare them to those of packable composites. Six materials were tested: Clearfil Majesty Posterior (CM), ELS Extra Low Shrinkage (EL), Filtek P60 (FP), Filtek Silorane (FS), Prodigy (PR) and Surefil (SU). Static and dynamic testing was performed and materials were tested dry and wet at different temperatures (21°C to 50°C). Shear and flexural modulus, loss tangent, dynamic viscosity, Poisson's ratio and creep recovery were calculated among others. Significant differences were found both between the two groups and between materials belonging to the same group. CM presented the highest shear and flexural modulus and EL the lowest. All materials were softened by an increase of temperature, while FS was the least affected by water and PR showed to be the most susceptible. Different approaches used to overcome polymerization shrinkage lead to materials with different properties.

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“…It is polymerized through a cationic reaction involving the cycloalyfatic oxirane ring opening. The resulting composite exhibits less than 1% shrinkage 3 , which leads to better marginal integrity 4 and less microleakage compared to methacrylate composites 5 . In addition to the monomer composition, factors that influence the stresses created by polymerization include the photo initiator, number and type of filler, c-factor, restorative technique, and light source 1,6 .…”

Section: Introductionmentioning

confidence: 99%

Influence of enamel acid-etching on mechanical properties and nanoleakage of resin composite after aging

et al. 2017

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Aim: The aim of this study was to evaluate how acid-etching of the cavosurface enamel in Class I resin composite restorations influences the bond strength to the pulpal wall and the restoration, Knoop microhardness and nanoleakage after thermomechanical aging. For this research 76 fresh human molars were selected and restored with Silorane or Clearfil SEBond/Z350XT composite divided in 4 groups (Silorane system restored with or without enamel cavosurface acid-etching and Clearfil SEBond/Z350XT with or without enamel cavosurface acid-etching). To induce artificial aging, samples were subjected to thermomechanical cycling through 200,000 and thermal cycling between 5 and 55 °C with 30 second filling and 15-second drainage steps. Microhardness and microtensile bond strength were evaluated in 32 teeth (n=8) each and nanoleakage evaluation was performed in 12 teeth (n=3). Samples restored by Clearfil SEBond/Z350 XT without cavosurface acid-etching showed significantly lower microtensile bond strength results. The resin composite Z350XT presented higher values of Knoop microhardness. It was observed little or no infiltration for Silorane groups and moderate infiltration for Clearfil SE Bond groups. Acid-etching of the cavosurface enamel during restoration procedure with Clearfil Se Bond resulted in a stronger bond after thermomechanical cycling. Silorane groups showed less infiltration than Clearfil SE Bond groups.

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Setting characteristics and cavity adaptation of low-shrinking resin composites

Cited by 96 publications

References 21 publications

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

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

Viscoelastic properties of low-shrinking composite resins compared to packable composite resins

Influence of enamel acid-etching on mechanical properties and nanoleakage of resin composite after aging

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