Poly(propylene glycol) and urethane dimethacrylates improve conversion of dental composites and reveal complexity of cytocompatibility testing

Walters, Nick; Xia, Wendy; Salih, Vehid; Ashley, Paul; Young, Alison

doi:10.1016/j.dental.2015.11.017

Cited by 69 publications

(77 citation statements)

References 44 publications

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“…At elevated temperatures, higher conversion is required for this glass transition temperature to be reached. Final conversions at room temperature for the PPGDMA and TEGDMA composites are comparable with values obtained using the same monomers but light activated polymerization [10]. Greater final conversion with the PPGDMA pastes could be a consequence of the longer flexible polypropylene glycol chain lowering the glass transition temperatures.…”

Section: Maximum Monomer Conversionssupporting

confidence: 65%

Polymerization Kinetics Stability, Volumetric Changes, Apatite Precipitation, Strontium Release and Fatigue of Novel Bone Composites for Vertebroplasty

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Khan

et al. 2018

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14 Purpose: The aim was to determine effects of diluent monomer and monocalcium 15 phosphate monohydrate (MCPM) on polymerization kinetics and volumetric stability, 16 apatite precipitation, strontium release and fatigue of novel dual-paste composites for 17 vertebroplasty. 18 Materials and methods: Polypropylene (PPGDMA) or triethylene (TEGDMA) glycol 19 dimethacrylates (25 wt%) diluents were combined with urethane dimethacrylate (70 20 wt%) and hydroxyethyl methacrylate (5 wt%). 70 wt% filler containing glass particles, 21 glass fibers (20 wt%) and polylysine (5 wt%) was added. Benzoyl peroxide and MCPM 22 (10 or 20 wt%) or N-tolyglycine glycidyl methacrylate and tristrontium phosphate (15 23 wt%) were included to give initiator or activator pastes. Commercial PMMA (Simplex) 24 and bone composite (Cortoss) were used for comparison.

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Section: Maximum Monomer Conversionssupporting

confidence: 65%

Polymerization Kinetics Stability, Volumetric Changes, Apatite Precipitation, Strontium Release and Fatigue of Novel Bone Composites for Vertebroplasty

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Khan

et al. 2018

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“…16,17 Previous reports 8,18,19,20 assessed the bond strength of lithium disilicate ceramics etched with only one specific HF concentration and then luted to dentin using different chemical-physical setting modalities available for commercial resin cements. As the main components of resin matrix are methacrylate-based materials, such as Bis-GMA (bis-phenol A diglycidyl dimethacrylate), TEGDMA (tri-ethylene glycol dimethacrylate) and UDMA (urethane dimethacrylate), 21,22 their role on the bonding between EMX etched with different HF concentrations to dentin has not been investigated so far. As not all commercially available resin cements present UDMA (such as RelyX Veneer, 3M ESPE, St. Paul, MN, USA) and considering the distinct chemical and physical properties of UDMA compared to BisGMA and TEGDMA, 23,24,25 it becomes necessary to investigate the role of UDMA on the bonding characteristics to EMX as well.…”

Section: Introductionmentioning

confidence: 99%

The effect of hydrofluoric acid and resin cement formulation on the bond strength to lithium disilicate ceramic

et al. 2018

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To investigate how the hydrofluoric acid (HF) concentrations applied to a lithium disilicate glass-ceramic (EMX) affects the surface morphology and microtensile bond strength (μTBS) of ceramics to dentin, using light-cured resin cements with or without UDMA. Sixty-three EMX square ceramic blocks were etched for 20 seconds using different HF concentrations (1%, 5% and 10%) and luted to dentin using two types of resin cement combinations: BisGMA/TEGDMA and BisGMA/TEGDMA/UDMA (n = 10). Each bonded EMX-dentin block was sectioned to obtain 1 mm2 sticks for μTBS evaluation. Half of the sticks were tested after 24 hours and the other half was assessed after 6 months of water storage. Data were statistically assessed using split-plot three-way ANOVA and multiple comparisons were performed using the Tukey's post hoc test (α = 0.05). One EMX sample from each HF concentration was analyzed using field-emission scanning electron microscope (FE-SEM) to characterize the etching pattern. According to the FE-SEM images, increasing the concentration of HF from 1 to 5 and then to 10% led to increased removal of glassy matrix and greater exposure of lithium disilicate crystals. The 10% HF concentration yielded higher μTBS when compared to 1% for BisGMA/TEGDMA formulation (p < 0.05); whereas HF 1% and 5% showed similar μTBS values when compared to 10% HF for BisGMA/TEGDMA/UDMA resin matrix (p > 0.05) at both storage times. Water aging decreased the μTBS values (p < 0.05), except when 10% HF was associated with BisGMA/TEGDMA resin cement. Resin cement formulation and hydrofluoric acid concentrations can interfere with the immediate and long-term glass-ceramic bond strength to dentin.

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“…A chemical difference of the experimental cements in relation to the commercial one, is that the experimental ones contain the UDMA monomer and according to Walterns et al (23), when the UDMA is incorporated with Bis-GMA or TEG-DMA, forming a stronger and more homogeneous polymers trio, it improves the physicomechanical composite properties.…”

Section: Discussionmentioning

confidence: 99%

Influence of Photoinitiator on Accelerated Artificial Aging and Bond Strength of Experimental Resin Cements

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The goal of this study was to evaluate in vitro the effect of the photoinitiator phenylpropanedione (PPD), alone or combined with camphorquinone (CQ), on color stability of photoactivated resin cements and their bond strength to ceramics using a micro-shear test. Four resin cements were used: a commercial brand cement (RelyX Veneer®) and 3 experimental cements with different types and concentration of photoinitiators. For color analysis, ceramic discs were cemented on bovine dentin specimens to simulate indirect restorations (n=8) and were exposed to UV for 120 h and tested for color alteration using a reflectance spectrophotometer and the CIEL*a*b* system. Data were analyzed by Anova and Tukey's test at 5% significance level. The color test results did not present statistically significant difference for the ∆E for all the studied cements, neither for ∆L, ∆a and ∆b. For the bond strength, all the studied cements showed statistically significant differences to each other, with the highest result for the RelyX Veneer® (29.07 MPa) cement, followed by the cement with CQ (21.74 MPa) and CQ+PPD (19.09 MPa) cement; the lowest result was obtained by the cement using only PPD as a photoinitiator (13.99 MPa). So, based on the studied parameters, PPD was not advantageous as photoinitiator of resin cements, because it showed a low value of bond strength to the ceramics and no superior color stability.

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Poly(propylene glycol) and urethane dimethacrylates improve conversion of dental composites and reveal complexity of cytocompatibility testing

Cited by 69 publications

References 44 publications

Polymerization Kinetics Stability, Volumetric Changes, Apatite Precipitation, Strontium Release and Fatigue of Novel Bone Composites for Vertebroplasty

Polymerization Kinetics Stability, Volumetric Changes, Apatite Precipitation, Strontium Release and Fatigue of Novel Bone Composites for Vertebroplasty

The effect of hydrofluoric acid and resin cement formulation on the bond strength to lithium disilicate ceramic

Influence of Photoinitiator on Accelerated Artificial Aging and Bond Strength of Experimental Resin Cements

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