Synthesis, characterization and evaluation of urethane derivatives of Bis-GMA

Khatri, C A.; Stansbury, J.W.; Schultesiz, Carl R.; Antonucci, Joseph M.

doi:10.1016/s0109-5641(02)00108-2

Cited by 146 publications

(116 citation statements)

References 6 publications

Supporting

Mentioning

108

Contrasting

Unclassified

Order By: Relevance

“…Th e composite viscosity is correlated with the type of resin matrix. Bis-GMA as the most viscous one is also least fl exible, while UDMA and TEGD-MA are least viscous [35][36][37][38] . Th e aforementioned correlation was observed in this study, where the highest microhardness values were noted for materials based on Bis-GMA matrix, GSO and XTF in the high-viscosity group, and XB of the low-viscosity materials.…”

Section: Discussionmentioning

confidence: 99%

Microhardness of Bulk-Fill Composite Materials

Kelić¹,

Matić

Marović

et al. 2016

acc

View full text Add to dashboard Cite

SUMMARY -Th e aim of the study was to determine microhardness of high-and low-viscosity bulk-fi ll composite resins and compare it with conventional composite materials. Four materials of high-viscosity were tested, including three bulk-fi lls: QuiXfi l (QF), x-tra fi l (XTF) and Tetric EvoCeram Bulk Fill (TEBCF), while nanohybrid composite GrandioSO (GSO) served as control. Th e other four were low-viscosity composites, three bulk-fi ll materials: Smart Dentin Replacement (SDR), Venus Bulk Fill (VBF) and x-tra base (XB), and conventional control material X-Flow (XF). Composite samples (n=5) were polymerized for 20 s with Bluephase G2 curing unit. Vickers hardness was used to determine microhardness of each material at the surface, and at 2-mm and 4-mm depth. GSO on average recorded signifi cantly higher microhardness values than bulk-fi ll materials (p<0.001). Th e low-viscosity composite XF revealed similar microhardness values as SDR, but signifi cantly lower than XB (p<0.001) and signifi cantly higher than VBF (p<0.001). Microhardness of high-viscosity bulk-fi ll materials was lower than microhardness of the conventional composite material (GSO). Surface microhardness of low-viscosity materials was generally even lower. Th e microhardness of all tested materials at 4 mm was not diff erent from their surface values. However, additional capping layer was a necessity for low-viscosity bulk-fi ll materials due to their low microhardness.

show abstract

Section: Discussionmentioning

confidence: 99%

Microhardness of Bulk-Fill Composite Materials

Kelić¹,

Matić

Marović

et al. 2016

acc

View full text Add to dashboard Cite

show abstract

“…The extent of monomer reaction of a composite can be limited due to steric hindrance during polymerization. [23][24] The rapid increase in viscosity due to the increase in DC of a composite during the initial stage of polymerization may hinder the diffusion of radical components to limit further monomer conversion. 13,15 This may apply to light-activated, dual-cured materials and lightcured materials.…”

Section: Discussionmentioning

confidence: 99%

Changes in Degree of Conversion and Microhardness of Dental Resin Cements

Yan

Kim²,

Kim³

et al. 2010

Operative Dentistry

View full text Add to dashboard Cite

Resin specimens were prepared for Fourier transform infrared (FTIR) spectroscopy and microhardness testing to determine the DC and Vickers hardness (VH), respectively. The lightcured materials or mixed pastes of the dualcured materials were irradiated with a light-curing unit (Elipar TriLight) through a precured composite overlay for 40 seconds. The FTIR spectra and microhardness readings were taken at specified times: 1, 2, 5, 10, 15, 30 and 60 minutes; 24 hours and after two days and seven days. YL Yan • YK Kim K-H Kim • T-Y Kwon Clinical RelevanceChemical-and dual-cured resin cements, as well as light-cured resin cements, appear to be cured within the first 24 hours post-mix or post-light activation with no further significant changes in the degree of conversion or microhardness.According to the FTIR study, most of the curing reaction of Choice 2 and RelyX Veneer occurred within 10 and 30 minutes, respectively. Multilink, C&B Cement and Calibra exhibited gradual increases in the DC up to 24 hours, with no further statistically significant increase (p>0.05). RelyX ARC attained a DC value within five minutes, similar to that at seven days (p>0.05). Choice 2 and RelyX ARC showed gradual increases in the VH, up to 15 minutes, with no further significant change over the remaining observation time (p>0.05). For RelyX Veneer, Multilink, C&B Cement and Calibra, there were no significant increases in the VH value after 24 hours (p>0.05). The light-cured materials produced significantly higher DC values than the chemicalcured materials (p<0.05). The DC values of the two dual-cured resin cements were significantly different from each other (p<0.001). The results suggest that the significant polymerization reaction was finished within 24 hours post-mix or post-light activation for all resin cements tested.

show abstract

“…Differences in the structures of the fillers could explain why the ormocer and microfill resin composites revealed greater color change compared to microhybrid composite after bleaching with a high concentration of hydrogen peroxide. For dental materials, the overall refractive index (i.e., pertaining to both resin matrix and filler particles) is generally larger than about 1.45 12,13,31,32) . Therefore, the resulting refractive indices of the composite materials seem somewhat underestimated 31) .…”

Section: Discussionmentioning

confidence: 99%

“…For dental materials, the overall refractive index (i.e., pertaining to both resin matrix and filler particles) is generally larger than about 1.45 12,13,31,32) . Therefore, the resulting refractive indices of the composite materials seem somewhat underestimated 31) . The approach applied for the determination of refractive indices in this study assumed a simple air/material model which ignored the surface overlayer of the composite material.…”

Section: Discussionmentioning

confidence: 99%

Effect of Bleaching on Color Change and Refractive Index of Dental Composite Resins

Hubbezoğlu¹,

Akaoglu²,

Doğan³

et al. 2008

Dent. Mater. J.

View full text Add to dashboard Cite

This study investigated the effects of three bleaching agents (Whiteness Perfect, Whiteness Super, and Whiteness HP) on the color change and refractive index of three dental composites (Admira, Durafill VS, and Gradia Direct). Twenty diskshaped specimens (10×2 mm) of each composite were prepared and divided into four subgroups (n=5). An unbleached group was used as a control, while the remaining specimens in the three subgroups were bleached with one of the bleaching agents respectively. Color change was assessed according to CIELAB color system and refractive indices were determined by phase modulated spectroscopic ellipsometry. Color differences between bleaching and baseline value (ΔE) were less than 3.3 for all groups. However, bleaching with Whiteness HP led to noticeable color changes for Admira and Durafill VS. While this agent had no effect on the refractive indices of these composites, the other two agents containing carbamide peroxide increased their refractive indices. Therefore, results suggested that replacement of such composite restorations may be required after bleaching.

show abstract

Synthesis, characterization and evaluation of urethane derivatives of Bis-GMA

Cited by 146 publications

References 6 publications

Microhardness of Bulk-Fill Composite Materials

Microhardness of Bulk-Fill Composite Materials

Changes in Degree of Conversion and Microhardness of Dental Resin Cements

Effect of Bleaching on Color Change and Refractive Index of Dental Composite Resins

Contact Info

Product

Resources

About