Network structure of Bis-GMA- and UDMA-based resin systems

Floyd, Cynthia J.E.; Dickens, Sabine H.

doi:10.1016/j.dental.2005.10.009

Cited by 268 publications

(232 citation statements)

References 30 publications

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“…The absence of a phenol ring in the monomer chain of UDMA leads to greater flexibility and toughness when compared with Bis-GMA, making the UDMA resins more reactive, with higher conversion and cross-link density than are associated with the Bis-GMA polymers, contributing to the matrix being more resistant to abrasion. 36 Based on the results of this current study, the hypothesis that a nanofilled RMGI subjected to a pH-cycling model prior to a three-body abrasion test would not differ in surface roughness and micromorphology from a conventional GI, RMGI, and nanofilled resin composite was rejected. Ketac N100 showed statistically significant intermediate roughness values between GI and a nanocomposite resin after pH cycling and toothbrushing abrasion.…”

Section: Discussionmentioning

confidence: 99%

“…9 Filtek Supreme nanocomposite presents nanofillers and nanoclusters and the resin matrix had other resin monomers, such as the ethoxylated version of Bis-GMA (Bis-EMA) and urethane dimethacrylate (UD-MA). 36 Thus, Ketac N100 had an intermediate composition between RMGIs and nanocomposites, presenting intermediate superficial characteristics and abrasion resistance. Ketac N100 presented an appearance more like a polyacid-modified resin composite based on resin components and structure; however, further studies must be conducted to investigate this fact.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Chemical and Mechanical Degradation on Surface Roughness of Three Glass Ionomers and a Nanofilled Resin Composite

Carvalho¹,

Sampaio²,

Fucio³

et al. 2012

Operative Dentistry

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The nanofilled glass ionomer provides intermediate resistance to chemical and mechanical degradation among the glass ionomer cements (conventional and resin-modified) and nanofilled composite. SUMMARYNanofillers have been incorporated into glass ionomer (GI) restorative materials to improve their mechanical and surface properties. The aim of this present laboratory study was to compare the superficial roughness (Ra) of nanofilled GI (Ketac N100) with that of conventional GI (Fuji IX GP), resin-modified GI (Vitremer), and a nanofilled resin composite (Filtek Supreme) after pH cycling and toothbrush abrasion. Ten specimens of each material were made using Teflon molds, which were polished using aluminum-oxide abrasive disks. Three measurements of Ra were made of each specimen to serve as baseline values. The specimens were submitted to pH cycling for 10 days in a demineralization solution for six

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Chemical and Mechanical Degradation on Surface Roughness of Three Glass Ionomers and a Nanofilled Resin Composite

Carvalho¹,

Sampaio²,

Fucio³

et al. 2012

Operative Dentistry

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“…With all these data it is possible to plot a graph of Degree Conversion vs. Time. [29][30][31][32][33][34][35][36][37][38][39][40][41] …”

Section: Mid Infrared Spectroscopy (Mir)mentioning

confidence: 99%

Synthesis, thermal studies and conversion degree of dimethacrylate polymers using new non-toxic coinitiators

Alarcon¹,

Holanda²,

Rinaldo³

et al. 2017

Quim. Nova

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The aim of this paper is to replace toxic coinitiators (tertiary amines) by non-toxic compounds such as glycerol and inositol (polyalcohol) in dimethacrylate resins. For this purpose, mid infrared spectroscopy (MIR) was used to calculate the monomers' degree of conversion (%DC); as well as simultaneous Thermogravimetric Analysis -Differential Thermal Analysis (TGA-DTA) and Differential Scanning Calorimetry (DSC) were conducted to evaluate thermal stability, degradation steps, and thermal events. The use of different initiator systems did not modify the thermal events or the thermal stability of each of the dimethacrylate resins. Results show a substitution of system 2 (toxicity) by system 3 (low toxicity), which had a good conversion velocity and total conversion in some monomers, is plausible.

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“…Bond strength between the original material and newly added resin is dependent on unreacted C=C double bonds [25]. The resins often have incomplete C=C double-bond conversion after being polymerized [37]. As the material ages, more cross-linking decreases the capability of fresh monomer to infiltrate into the matrix, and fewer and fewer unreacted C=C double bonds remain [38].…”

Section: Discussionmentioning

confidence: 99%

Improving shear bond strength of temporary crown and fixed dental prosthesis resins by surface treatments

Kim

Lee

et al. 2015

J Mater Sci

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This study evaluated the effect of surface treatments on the bond strength of repaired temporary resins. One-hundred flat-surfaced cylindrical specimens (Ø 7 mm 9 12 mm) of each temporary resin (2 bis-acryl resins and 2 polymethyl-methacrylates) were prepared. The specimens were randomly divided into 10 groups (n = 10), according to the types of surface treatments: untreated, adhesive treated, silanated, silane ? adhesive treated, hydrofluoric acid etched, laser treated, sandblasted, sandblasting ? adhesive treated, sandblasting ? silanated, and tribochemical silica coating ? silanated. Each resin material of the same brand with cylindrical shape (Ø 3 mm 9 3 mm) was polymerized onto the resin surfaces, and specimens were stored for 24 h in distilled water. The shear bond strengths were measured and failure modes were examined. All data were analyzed with a one-way ANOVA and multiple comparison Scheffé post hoc test (a = 0.05). For bis-acryl resins, the highest shear bond strength was observed in sandblasted group and the lowest was observed in the control group. Results show that the repair bond strength was improved for bis-acryl resin by 23 % than that of the control group due to the increase in surface roughness by sandblasting. However, chemical treatment did not improve repair bond strength. The surface treatment of bis-acryl resins with sandblasting seems to be promising for the improvement of repair bond strength.

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Network structure of Bis-GMA- and UDMA-based resin systems

Cited by 268 publications

References 30 publications

Effect of Chemical and Mechanical Degradation on Surface Roughness of Three Glass Ionomers and a Nanofilled Resin Composite

Effect of Chemical and Mechanical Degradation on Surface Roughness of Three Glass Ionomers and a Nanofilled Resin Composite

Synthesis, thermal studies and conversion degree of dimethacrylate polymers using new non-toxic coinitiators

Improving shear bond strength of temporary crown and fixed dental prosthesis resins by surface treatments

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