Dental Restorative Materials

Watts, D.C.

doi:10.1002/9783527603978.mst0165

Cited by 9 publications

(26 citation statements)

References 180 publications

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“…The monomer viscosity, as an important parameter in the polymerization kinetics of dimethacrylates and the composite applicability, was first determined. High-viscosity monomers have limited flexibility that improves mechanical properties, but negatively affects the degree of conversion in final polymer networks [1][2][3]28,29]. On the other hand, monomers of lower viscosity allow for higher filler loading hence improving mechanical properties of the composite [1][2][3]30].…”

Section: -The Properties Of Studied Polymers: Glass Temperature (T G mentioning

confidence: 99%

“…Bis-GMA is usually accompanied by triethylene glycol dimethacrylate (TEGDMA), acting as a low viscosity reactive diluent to achieve high filler loading. The stiff molecular structure and hydroxyl groups of Bis-GMA ensure low cure shrinkage, high polymer modulus and desirable adhesion to tooth enamel [1][2][3][4][5]. They can increase the resin's viscosity, residual unsaturation in the polymer and its water uptake.…”

Section: Introductionmentioning

confidence: 99%

“…They can increase the resin's viscosity, residual unsaturation in the polymer and its water uptake. On the other hand, TEGDMA has been shown to increase matrix water sorption and its polymerization shrinkage [1][2][3]6,7]. Alternative dental formulations contain urethane-dimethacrylate monomer-1,6-bis-(methacryloyloxy-2-ethoxycarbonylamino)-2,4,4-trimethylhexane, commonly abbreviated to UDMA, but for the purpose of this work it has been abbreviated to HEMA/TMDI.…”

Section: Introductionmentioning

confidence: 99%

“…The advantage of HEMA/TMDI is its lower viscosity, when compared to Bis-GMA. Moreover, urethane linkage can form strong hydrogen bonds and thus improve both durability of the composite's matrix as well as bonding to the tooth structure [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of urethane-dimethacrylate derivatives as alternative monomers for the restorative composite matrix

Barszczewska-Rybarek

2014

Dental Materials

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Section: -The Properties Of Studied Polymers: Glass Temperature (T G mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of urethane-dimethacrylate derivatives as alternative monomers for the restorative composite matrix

Barszczewska-Rybarek

2014

Dental Materials

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“…In real systems, i.e., in chemically or lightly cured dimethacrylates, the conversion of double bonds ranges from 55 to 75 % [35,36].…”

Section: Conversion Of Unsaturated Bondsmentioning

confidence: 99%

Thermo-mechanical behavior and specific volume of highly crosslinked networks based on glycerol dimethacrylate and its derivatives

Podgórski¹

2012

J Therm Anal Calorim

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Three substituent derivatives of glycerol dimethacrylate (GDMA) i.e., acetyloxypropyl dimethacrylate (Acet-GDMA), acryloyloxy-hydroxypropyl methacrylate (GMMA), and acetyloxy-acryloyloxypropyl methacrylate (Acet-GMMA) as well as GDMA were prepared and UVhomopolymerized in the presence of 2,2-dimethoxy-2-phenyloacetophenone. The obtained homopolymers were subjected to dynamic mechanical studies and the deflections versus temperature measurements (HDT) were performed. The content of unreacted double bonds, glass transition temperatures (T g ) as well as degree of inhomogeneity have been examined in all studied systems. Also, expansivity was measured in the function of temperature and the effect of a substituent group on the network properties was investigated. The results show that the hydroxyl-containing networks are characterized by much lower T g and higher degree of heterogeneity than those devoid of hydroxyls. When homopolymerized, hydroxylfree dimethacrylates disclosed untypical deflection pattern which suggests that at higher temperatures the decrease in stiffness is compensated or even overrated by the increase in the specific volume. Expansivity measurements revealed twice as large volume increase of the acetylated polymers as opposed to their hydroxyl-containing analogs. Following these findings, a mechanism of thermally induced polymer ''swelling'' was proposed.

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Hydrolytic degradation and cracks in resin‐modified glass‐ionomer cements

Fano

et al. 2004

J Biomed Mater Res

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Water-absorption affects the basic properties of resin-modified glass-ionomer cements (RMGICs). Fick's law is usually invoked to explain the absorption process. The purpose of this study is to show that the absorption in accordance with the Fickian model cannot be extended to the whole of the specimen, and that microcrack formation is the main degradation mechanism for specimens cured in a closed environment. For this purpose, flat disk-shaped paste specimens 1.5 mm thick (aspect ratio 4), irradiated in closed conditions between two glass slides and stored in water for approximately 20 months, were analyzed periodically gravimetrically and under confocal fluorescence microscopy, with absorbed eosin used as the fluorescent probe. At pH 7.0, the specimen surface (10-20 micrometers in depth) absorbed water rapidly, swelled, and disintegrated in 20-40 days. Long-term storage produced isolated cracks and grains, no progress in the swelling, and a slow weight decrease. A lower pH (pH 3.5) produced a significant increase of the number of microcracks. The decrease in the irradiation time (30 s or less) enhanced the erosion process, producing very broad cracks. It was concluded that the prevalent mechanism of long-term hydrolytic degradation was based on the slow formation of cracks, whereas only in the early stage of storage did absorption occur quickly in accordance with the Fickian diffusion.

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Dental Restorative Materials

Cited by 9 publications

References 180 publications

Characterization of urethane-dimethacrylate derivatives as alternative monomers for the restorative composite matrix

Characterization of urethane-dimethacrylate derivatives as alternative monomers for the restorative composite matrix

Thermo-mechanical behavior and specific volume of highly crosslinked networks based on glycerol dimethacrylate and its derivatives

Hydrolytic degradation and cracks in resin‐modified glass‐ionomer cements

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