Properties of silorane-based dental resins and composites containing a stress-reducing monomer

Eick, J. David; Kotha, Shiva P.; Chappelow, Cecil C.; Kilway, Kathleen V.; Giese, Gregory J.; Glaros, Alan G.; Pinzino, Charles S.

doi:10.1016/j.dental.2006.09.002

Cited by 129 publications

(88 citation statements)

References 9 publications

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“…5,6 This mechanism implies a slight reduction of the initial distance between monomers, which results in a volumetric shrinkage of less than 1%, which might generate less stress on the adhesive interface. 5,7,8 This characteristic has been validated by other in vitro studies, 9,10 in which the siloranebased resin resulted in a significantly lower cusp deflection when applied to MOD preparations, in comparison to methacrylate-based resins. Moreover, the silorane-based resin has been shown to have adequate physical and mechanical properties, which make it suitable for clinical application.…”

Section: Introductionsupporting

confidence: 48%

Clinical Evaluation of a Low-shrinkage Composite in Posterior Restorations: One-Year Results

Baracco¹,

Perdigão²,

Cabrera³

et al. 2012

Operative Dentistry

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Filtek Silorane showed acceptable clinical performance after one year. However, the lowshrinkage resin combined with the self-etch adhesive did not provide any advantage over the methacrylate-based composite combined with the total-etch adhesive. SUMMARYObjectives: The aim of this study was to compare the one-year clinical performance of three restorative systems, which included a novel low-shrinkage composite and two bonding strategies.Materials and Methods: Twenty-five patients received three Class I (occlusal) or Class II restorations performed with one of three restorative systems: Filtek Silorane Restorative System (FS); Adper Scotchbond 1 XT, a twostep etch-and-rinse adhesive, with Filtek Z250 (XT); and Adper Scotchbond SE, a two-step self-etch adhesive, with Filtek Z250 (SE). All materials were applied following the manufacturer's instructions. Two independent observers evaluated the restorations at baseline, after six months, and after one year, according to the United States Public Health System modified criteria. The Kruskal-Wallis test and the Mann-Whitney U-test were computed to compare the behavior of the restorative systems; Friedman and Wilcoxon tests were used to analyze the intrasystem data (a=0.05).Results: All restorations were evaluated at one year. FS and XT performed statistically similarly at one year, but marginal staining for SE was statistically worse. Intrasystem comparisons between baseline and one year also showed deterioration of marginal staining for SE, while a deterioration of the marginal adaptation was recorded for both SE and FS. XT was the only system for which there was no

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Section: Introductionsupporting

confidence: 48%

Clinical Evaluation of a Low-shrinkage Composite in Posterior Restorations: One-Year Results

Baracco¹,

Perdigão²,

Cabrera³

et al. 2012

Operative Dentistry

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“…19 The epoxy ring opening of the silorane produces volume expansion, which can partially offset the curing contraction resulting from the simultaneous formation of covalent bonds and the reduction in space between adjacent molecules. 19,22,36,37 Additionally, in contrast to the radical polymerization reaction that forms parallel chains and significant reduction in volume with increased chain length, the cationic ring opening polymerization of a multifunctional monomer such as silorane results in a network formation that is accompanied by minimal reduction in volume. 19,37 Alternatively, the chemical composition of the resin matrix of AL is based on a combination of Bis-EMA, bisphenyl glycidylmethacrylate (Bis-GMA), and TEDGMA.…”

Section: Discussionmentioning

confidence: 99%

“…19,22,36,37 Additionally, in contrast to the radical polymerization reaction that forms parallel chains and significant reduction in volume with increased chain length, the cationic ring opening polymerization of a multifunctional monomer such as silorane results in a network formation that is accompanied by minimal reduction in volume. 19,37 Alternatively, the chemical composition of the resin matrix of AL is based on a combination of Bis-EMA, bisphenyl glycidylmethacrylate (Bis-GMA), and TEDGMA. The replacement of some low-molecular-weight TEGDMA with higher-molecular-weight Bis-EMA that has fewer double bonds per unit of weight increases the distance between polymer chains, which in turn decreases the polymerization contraction of the material.…”

Section: Discussionmentioning

confidence: 99%

“…38,39 Results also revealed significantly lower elastic modulus exhibited by both SIL and AL, which is consistent with the results obtained by Eick and others for SIL. 37 According to Hooke's law, stress is equal to the elastic modulus multiplied by the strain. 40 Thus, lower shrinkage, combined with the lower elastic modulus of both SIL and AL, can explain the decreased stress within the composite structure.…”

Section: Discussionmentioning

confidence: 99%

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Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

El-Sahn

El-Kassas

El-Damanhoury

et al. 2011

Operative Dentistry

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SUMMARY This study evaluated the microtensile bond strength (μ-TBS) of low-shrinkage composites with their corresponding adhesive systems, Filtek Silorane/Silorane adhesive (SIL, 3M ESPE AG, Seefeld, Germany) and Aelite LS/One-Step Plus (AL, BISCO Inc, Schaumburg, IL, USA) in cavities with different C-factors. Filtek Z250/Adper Single Bond Plus (Z, 3M ESPE, St Paul, MN, USA) was used as a control. Method Standardized Class I cavities were prepared in extracted human molars after removing occlusal enamel. Cavities were assigned into six different C-factors by applying nail polish to four walls, three walls, two walls adjacent to each other, two walls opposite to each other, one wall, or no walls. Resin composites with their corresponding adhesive systems were applied according to manufacturer instructions. Specimens were sectioned to obtain four rectangular beams from the center of the restorations and μ-TBS was measured. Data were analyzed by Weibull survival analysis. Shrinkage stresses of the resin composites were determined after 30 minutes from the start of light-curing using a tensometer testing machine. Flexure elastic modulus was determined using standard procedures, in accordance with ISO 4049. Data for shrinkage stress and elastic modulus were analyzed by one-way analysis of variance followed by a Tukey multiple-comparisons test (p<0.05). Results μ-TBS of both SIL and AL were not affected by different C-factors; however, the bond strength of Z decreased significantly when the C-factor increased. Shrinkage stress results were 0.94±0.1, 1.79±0.18, and 2.14±0.23 MPa for SIL, AL, and Z, respectively. The flexural modulus of both the SIL and the AL was significantly lower than that of Z. Conclusions Increasing C-factor did not negatively affect the bond strength of low-shrinkage composites.

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“…Aside from the slower polymerization rate, other factors such as lower elastic modulus and glass transition temperatures may reduce shrinkage stress. 19 The composite with CQ/PPD showed intermediate stress fringes compared with composites with CQ or PPD alone, but the stress values were statistically similar. This probably occurred because the combination of CQ/PPD led to an intermediate polymerization rate at the beginning of the reaction, but to a rate similar to that of CQ and PPD alone at the end of the polymerization process.…”

Section: Discussionmentioning

confidence: 98%

Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress

et al. 2012

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We compared polymerization stress in two commercial composites and three experimental composites made using camphorquinone (CQ) and/or phenylpropanedione (PPD) as photoinitiators. The internal surfaces of photoelastic resin discs with cylindrical cavities were roughened and treated with adhesive. Composites were divided into five groups: two commercial composites (Filtek Silorane and Filtek Z250) and three experimental composites with CQ/amine, CQ/PPD/amine, and PPD/amine. Composites were photopolymerized inside cavities, and subjected to photoelastic analysis immediately and at 24 hours and 7 days later using a plane polariscope. Stress created by Silorane (3.08 ± 0.09 MPa) was similar to that of Z250 (3.19 ± 0.13 MPa) immediately after photopolymerization (p > 0.05). After 24 hours and 7 days, Z250 (3.53 ± 0.15 and 3.69 ± 0.10 MPa, respectively) showed higher stress than Silorane (3.19 ± 0.10 and 3.16 ± 0.10 MPa, respectively). Qualitative analysis immediately after photopolymerization showed composite/CQ promoted higher stress than PPD, but stress levels at other evaluated times were statistically similar, varying between 3.45 ± 0.11 MPa and 3.92 ± 0.13 MPa. At 24 hours and 7 days, Silorane created the lowest stress. All photoinitiators created comparable tensions during polymerization.

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Properties of silorane-based dental resins and composites containing a stress-reducing monomer

Cited by 129 publications

References 9 publications

Clinical Evaluation of a Low-shrinkage Composite in Posterior Restorations: One-Year Results

Clinical Evaluation of a Low-shrinkage Composite in Posterior Restorations: One-Year Results

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress

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