Influence of Bulk Thickness, Curing Time, and Curing Unit Type on the Microhardness of Different-Viscosity Bulk-Fill Composites

Сайпуллаев, М. С.; Erdemir, Uğur; Yıldız, Esra

doi:10.1007/s11029-018-9775-z

Cited by 6 publications

(5 citation statements)

References 31 publications

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Section: Discussionmentioning

confidence: 99%

“…The high viscosity of the Bis-EFMA group DRCs might be one of the reasons which lead to the advance of the gel point, restricting the movement of the monomer and free radical, finally leading to the reduction of the polymerization degree. 63,64 In addition, high viscosity DRCs are easier to intercept bubbles and form more refractive interfaces, resulting in light intensity attenuation. 7,65 In this study, while the viscosity of all DRCs groups conformed to the viscosity range of commercial flowable resin composites, 12,13 Bis-EFMA/UDMA group of (40/60), (60/40) and (80/20) are more suitable for clinical use, according to the operation experiences during the experimental process.…”

Section: Discussionmentioning

confidence: 99%

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Low shrinkage bulk-filled dental resin composites with non-estrogenic dimethacrylate

Zhang

Huang

et al. 2023

Biomater. Sci.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Low shrinkage bulk-filled dental resin composites with non-estrogenic dimethacrylate

Zhang

Huang

et al. 2023

Biomater. Sci.

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“…This is explained by the fact that the light passes through the mass of the restorative material, its density decreases greatly, and therefore reduces its curing potential (4). Also, filler content and particle size of the material play an important role in the degree of polymerization at the bottom surface (27,28).…”

Section: Discussionmentioning

confidence: 99%

Effect of Disposable Sheaths on the Vickers Microhardness of Resin Composites

Atay

Dindar

Özveren

2021

Clinical and Experimental Health Sciences

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Objective:The aim of this study was to evaluate the effect of disposable sheaths on microhardness of resin composites.Methods: A total of 40 resin composite specimens were fabricated with disc-shaped perspex molds (5x2 mm). Specimens were divided into 4 groups: Irradiated by 1-Elipar LCU (EL), 2-Elipar LCU with sheath (ELS), 3-Valo LCU (VL), 4-Valo LCU with sheath (VLS), (n=10). The specimens were subjected to surface microhardness (SMH) test (Tronic, Digital Microhardness Tester DHV-1000) on the top and bottom surfaces under 200 g load applied for 10 s with a Vickers indenter. The specimens were stored in the distilled water at 37 °C for 24 hours and the same measurements were repeated. One-way ANOVA test, Tukey and Tamhane post-hoc tests were used for intergroup comparisons. Also paired sample t-test was used for comparisons of the different time results. Results:According to the 1st-hour data from the top and bottom SMH measurements, EL and VL groups have significantly higher microhardness values than VLS and ELS groups (p<0.05). There was a dependent change in the top surface measurements with the time (p=0.000), but also interaction with the LCU (p=0.000). All groups showed significant microhardness decrease from 1st to 24th-hour for both top and bottom values (p<0.05) except for top SMH of VLS group (p=0.151). Conclusion:Disposable sheaths decreased the light output of the LCU's and caused reduction in the SMH. Although they are effective in preventing cross-infection, they significantly reduced the polymerization efficiency, thereby mechanical properties of resin composites.

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“…Factors such as size and composition of fillers, translucency of materials, curing type, intensity of LED, curing time, composition of monomer, and concentration of photoinitiator can affect the DC of composite resins [44,45]. Also, by an increase in filler content, DC relatively decreases, which can be attributed to the reduction in resin content and light scattering at the resin-filler interface [46].…”

Section: Discussionmentioning

confidence: 99%

Curing Depth and Degree of Conversion of Five Bulk-Fill Composite Resins Compared to a Conventional Composite

Rezaei¹,

Abbasi²,

Mahounak³

et al. 2019

TODENTJ

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Background: Limited curing depth and its effect on the degree of conversion are among the challenges of working with light-cure composite resins. The use of bulk-fill composites is one strategy to overcome these limitations. Methods: Ever X Posterior (EXP), Filtek Bulk-Fill Posterior (FBP), Sonic Fill 2 (SF2), Tetric N-Ceram Bulk-Fill (TNB), and X-tra Fil (XF) bulk-fill and Filtek Z250 conventional composite were evaluated in this in vitro experimental study. Six samples for the assessment of microhardness and three samples for the evaluation of DC were fabricated of each composite. After light curing and polishing, the samples were incubated at 37°C for 24 hours. Microhardness was measured by a Vickers hardness tester three times and the mean value was calculated. DC of the top and bottom surfaces was determined using Fourier-Transform Infrared Spectroscopy (FTIR). Data were analyzed using one-way ANOVA and Tukey’s test. Results: Microhardness and DC were significantly different among the groups (P<0.001). XF and Z250 equally showed the highest bottom-to-top surface microhardness ratio (0.97 ± 0.01) and significantly higher DC in the top (P<0.001) and bottom (P<0.005) surfaces compared to other groups. TNB showed the lowest microhardness ratio (0.88 ± 0.04) and DC (68.66 ± 1.52 and 61.00 ± 2.00); the difference in DC of the bottom surface was statistically significant (P<0.003). Conclusion: It appears that bulk-fill composites evaluated in this study are adequately polymerized at 4 mm depth. Their DC was optimal and within the range of conventional composites.

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Influence of Bulk Thickness, Curing Time, and Curing Unit Type on the Microhardness of Different-Viscosity Bulk-Fill Composites

Cited by 6 publications

References 31 publications

Low shrinkage bulk-filled dental resin composites with non-estrogenic dimethacrylate

Low shrinkage bulk-filled dental resin composites with non-estrogenic dimethacrylate

Effect of Disposable Sheaths on the Vickers Microhardness of Resin Composites

Curing Depth and Degree of Conversion of Five Bulk-Fill Composite Resins Compared to a Conventional Composite

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