Effect of solvent type and content on monomer conversion of a model resin system as a thin film

Holmes, R. G.; Rueggeberg, Frederick A.; Callan, Richard S.; Caughman, Frank; Chan, Daniel C.N.; Pashley, David H.; Looney, Stephen W.

doi:10.1016/j.dental.2007.01.007

Cited by 49 publications

(49 citation statements)

References 27 publications

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“…They suggest various mechanisms by which acetone could contribute to this phenomenon: (1) acetone reduces the viscosity of the liquid and is a good carrier for monomers 19) ; (2) acetone is a good solvent and tends to solubilize PMMA-polymer surfaces 7) ; (3) acetone vaporizes and prevents water molecules from surface quickly 6) . In our study, we did not mix the dentin bonding agent with acetone but instead applied the acetone separately.…”

Section: Discussionmentioning

confidence: 99%

Effect of different surface treatments on the repair strength of a nanofilled resin-based composite

et al. 2011

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The purpose of our study was to re-evaluate the effects of surface treatment on the bond strength of repaired methacrylate-based dental composite materials including nanofillers (Ceram X, Dentsply). The microtensile bond strengths were measured before or after thermo-mechanical fatigue simulation. The treatments were as follows: (1)No treatment (negative control), (2)Bonding agent, (3) Acetone, (4)Acetone+Bonding agent, (5)Silane, (6)Silane+Bonding agent. In the digitized SEM image of the polished aged specimens without any surface treatment, the percentage of the visible fillers relative to the whole image was calculated. Before and after fatigue, no significant differences could be observed among the different pretreatment groups. Fatigue increased the microtensile strength values of Acetone and Silane groups. The digitized SEM image reveals that 11.5% of the exposed surface could be identified as uncovered filler surface. None of surface treatments (acetone, silane and bonding agent) contributed to increase the tensile strength of repaired composite samples including nanofillers.

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Section: Discussionmentioning

confidence: 99%

Effect of different surface treatments on the repair strength of a nanofilled resin-based composite

et al. 2011

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“…In addition, a compatibilizing solvent, such as ethanol or acetone, may be included to control resin viscosity or assist in resin infiltration and water dispersion (Hashimoto et al, 2002;Yiu et al, 2005). While BisGMA and HEMA are miscible in all proportions as monomers under ambient conditions, and they form single-phase copolymers, a significant concern arises when even small concentrations of water are introduced, since this promotes phase separation into water/HEMA-rich and BisGMA-rich domains (Spencer and Wang, 2002;Ye et al, 2009) that seriously undermine the overall reactivity, strength, and practical performance potential of the adhesive (Holmes et al, 2007).…”

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confidence: 99%

Construction of Monomer-free, Highly Crosslinked, Water-compatible Polymers

et al. 2014

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Polymeric dental adhesives require the formation of densely crosslinked network structures to best ensure mechanical strength and durability in clinical service. Monomeric precursors to these materials typically consist of mixtures of hydrophilic and hydrophobic components that potentially undergo phase separation in the presence of low concentrations of water, which is detrimental to material performance and has motivated significant investigation into formulations that reduce this effect. We have investigated an approach to network formation based on nanogels that are dispersed in inert solvent and directly polymerized into crosslinked polymers. Monomers of various hydrophilic or hydrophobic characteristics were copolymerized into particulate nanogels bearing internal and external polymerizable functionality. Nanogel dispersions were stable at high concentrations in acetone or, with some exceptions, in water and produced networks with a wide range of mechanical properties. Networks formed rapidly upon light activation and reached high conversion with extremely low volumetric shrinkage. Prepolymerizing monomers into reactive nanostructures significantly changes how hydrophobic materials respond to water compared with networks obtained from polymerizations involving free monomer. The modulus of fully hydrated networks formed solely from nanogels was shown to equal or exceed the modulus in the dry state for networks based on nanogels containing a hydrophobic dimethacrylate and hydrophilic monomethacrylate, a result that was not observed in a hydroxyethyl methacrylate (HEMA) homopolymer or in networks formed from nanogels copolymerized with HEMA. These results highlight the unique approach to network development from nanoscale precursors and properties that have direct implications in functional dental materials.

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“…There is a known solvent concentration at which maximum conversion is reached, more or less solvent than this amount can decrease monomer conversion, 27 which seems related to the viscosity of the adhesive film. 24 Although not measured in this study, it was visually evident that OSP is far more fluid than SBP.…”

Section: Discussionmentioning

confidence: 99%

Impact of Adhesive Application and Moisture on the Mechanical Properties of the Adhesive Interface Determined by the Nano-indentation Technique

Higashi¹,

Michél²,

Reis³

et al. 2009

Operative Dentistry

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SUMMARY Objectives: This study assessed the nanohardness (NH) and Young's modulus (YM) of resindentin bonding components formed by an ethanol/water-based (Adper Single Bond Plus [SBP]) and an acetone-based system (One Step Plus [OSP]) under different moisture conditions and application methods.Material and Methods: On 24 human molars, a flat, superficial dentin surface was exposed by wet abrasion. After acid-etching, two coats of SBP or OSP adhesive were applied on either a dry or rewetted dentin surface under vigorous rubbing action or inactive application. After polymerization of the adhesives (600 mW/cm 2 /20 seconds), composite buildups were constructed incrementally and the specimens were stored in water (37°C/24 hours). They were cross-sectioned perpendicular to the resin-dentin interface to obtain 1.5 mm-thick slices that were embedded and polished before the test. Nano-indentations C Higashi • MD Michel • A Reis AD Loguercio • OMM Gomes • JC Gomes Clinical RelevanceThe vigorous rubbing action of acetone and ethanol/water-based adhesives into dry demineralized dentin resulted in high nanohardness and Young's modulus in the hybrid layer, and moisture increased the nanohardness and Young's modulus of Adper Single Bond Plus in the adhesive layer. Results: When the dentin was kept wet, the mode of application did not affect the studied properties within the hybrid layer. On the other hand, the vigorous application mode increased the NH and YM of both adhesives applied in airdried dentin. In the adhesive layer, the highest NH and YM were observed only for SBP, especially when applied in wet dentin under vigorous action.Conclusion: It was concluded that: 1) the vigorous application of both adhesives in dry dentin resulted in high nanohardness and Young's modulus values in the hybrid layer and 2) in the adhesive layer, the moisture associated with the vigorous application mode increased the nanohardness and Young's modulus values of Adper Single Bond Plus.

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Effect of solvent type and content on monomer conversion of a model resin system as a thin film

Cited by 49 publications

References 27 publications

Effect of different surface treatments on the repair strength of a nanofilled resin-based composite

Effect of different surface treatments on the repair strength of a nanofilled resin-based composite

Construction of Monomer-free, Highly Crosslinked, Water-compatible Polymers

Impact of Adhesive Application and Moisture on the Mechanical Properties of the Adhesive Interface Determined by the Nano-indentation Technique

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