Stability of silorane dental monomers in aqueous systems

Eick, J. David; Smith, Robert E.; Pinzino, Charles S.; Kostoryz, Elisabet L.

doi:10.1016/j.jdent.2005.09.004

Cited by 112 publications

(91 citation statements)

References 9 publications

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“…The low solubility and stability of silorane in aqueous systems has been reported before. [21][22][23][24] Filtek P60 had the highest Wsp and one of the lowest Wsl results; this may be related to its fi ller composition. Therefore, it may be hypothesized that hybrid composites with zirconia-derived fi llers could lead to a freer volume among the fi llers, considering KH is a mechanical property that may be related to the wear resistance of materials and their ability to remain stable.…”

Section: Statistical Analysesmentioning

confidence: 96%

Do new matrix formulations improve resin composite resistance to degradation processes?

et al. 2013

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The aim of this study was to determine the degradation resistance of three new formulations-silorane-, Ormocer-and dimer-acidbased materials-and compare them to the traditional dimethacrylatebased materials. One silorane-(Filtek P90, P90), one Ormocer-(Ceram-X, CX), one dimer-acid-(N'Durance, ND) and two dimethacrylate-based (Filtek P60, P60; Tetric Ceram, TC) materials were investigated. Water sorption (Wsp) and solubility (Wsl) were determined after the materials were immersed in water for 28 days. Knoop hardness (KH) was determined before and after 24 h immersion in pure ethanol. The flexuralstrength (FS) was determined by the bending test after one-week storage in a dry environment or after one-week immersion in pure ethanol. Data were submitted to analysis of variance (ANOVA) and Tukey's test (95%). The three new formulations showed lower Wsp than the dimethacrylatebased formulation. CX (0.50 ± 0.17%) and ND (0.72 ± 0.19%) exhibited the lowest Wsp, whereas P90 (0.02 ± 0.03%) and P60 (0.04 ± 0.03%) showed the lowest Wsl. All resins showed reduced Knoop hardness number (KHN) after ethanol immersion. P60 presented the lowest decrease in KH value (19 ± 5%). TC (48 ± 3%) and P90 (39 ± 9%) showed the highest KHN decrease after ethanol storage. The FS of CX, ND and TC were affected by ethanol storage. The new formulations did not improve the degradation resistance, as compared with the traditional methacrylatebased materials.

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Section: Statistical Analysesmentioning

confidence: 96%

Do new matrix formulations improve resin composite resistance to degradation processes?

et al. 2013

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“…Recently, Weinmann et al 11) reported on the synthesis of a new monomer system named "silorane", which is obtained from the reaction of oxirane and siloxane molecules. The silorane-based composite (SBC) exhibited low polymerization shrinkage due to the ring-opening oxirane monomer and increased hydrophobicity due to the presence of the siloxane species 11) .ItwasalsoclaimedthatSBC was stable and insoluble in biological fluids simulated using aqueous solutions containing epoxide hydrolase, porcine liver esterase, or diluted HCl 12) . In light of thesefavorableproperties,thisnewmonomersystem may be a promising solution to overcoming the negative effects of oral fluids on the mechanical propertiesofRBCs.…”

Section: Introductionmentioning

confidence: 99%

Effects of food-simulating liquids on the mechanical properties of a silorane-based dental composite

et al. 2009

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The purpose of this study was to investigate the effects of food-simulating liquids (FSL) on the hardness and flexural strength (FS) of a new silorane-based composite and to compare it with methacrylate-based composites (MBCs). Four restorative materials(FiltekSilorane,P60,Z250,andSupremeXT)wereused.SpecimensfortheFSandhardnessmeasurementswere fabricated in customized molds. Immediately after polymerization, the materials were stored in the following dietary simulatingsolventsat37ºCfor1week:distilledwater,0.02Ncitricacid,heptane,and75%aqueousethanolsolution.After conditioning, the FS and hardness values were measured. Data were subjected to ANOVA/Scheffé's test at a significance level of 0.05. The hardness and FS of Filtek Silorane were not significantly affected by FSL (p>0.05).Conversely,thehardnessof MBCs significantly decreased after conditioning in water and ethanol (p<0.05). Similarly, the FS values of MBCs were significantly affected after conditioning in ethanol.

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“…However, in all testing conditions it had the lowest loss tangent and it was the material which was affected the least by water at 21°C exhibiting no change or the smallest changes when stored in water for 24 h. This stability is attributed to its monomer chemistry. The siloxane backbone of silorane is highly hydrophobic thus making the reactive to water oxirane groups inaccessible to water molecules 22) . Packable composite resins were manufactured in order to provide composites with handling properties similar to amalgam and improved mechanical properties compared to other composites 23) .…”

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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Stability of silorane dental monomers in aqueous systems

Cited by 112 publications

References 9 publications

Do new matrix formulations improve resin composite resistance to degradation processes?

Do new matrix formulations improve resin composite resistance to degradation processes?

Effects of food-simulating liquids on the mechanical properties of a silorane-based dental composite

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

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