The Effect of Irradiance on the Degree of Conversion and Volumetric Polymerization Shrinkage of Different Bulk-Fill Resin-Based Composites: An In Vitro Study

Nooh, Abrar N. Bin; Nahedh, H Al; AlRefeai, Mohammad H.; Alkhudhairy, Fahad

doi:10.1055/s-0040-1721236

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…4 Bulk-fill composite resins are recognized to have a low polymerization shrinkage, and therefore, they seem to be able to reduce the stress at the tooth-restoration interface. 7 Because of this, they are used in direct restoring of dental elements, allowing to be packed in the dental cavity in a single dose (3 mm+) or greater dimension dose compared to conventional composites. 8 On the other side, literature reports that bulk-fill composites are inferior to conventional ones in terms of wear resistance and fracture toughness 9 ; accordingly, it may be advisable to cover their surface by using macrofilled resins, especially for flowable ones.…”

Section: Introductionmentioning

confidence: 99%

Microleakage of Direct Restorations-Comparisonbetween Bulk-Fill and Traditional Composite Resins:Systematic Review and Meta-Analysis

et al. 2021

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Since the bulk-fill composites were produced, there was a progressive diffusion of their use for direct conservative treatment in posterior teeth. Their chemical structure increases the depth of cure and decreases the polymerization contraction; in this manner, bulk-fill composites can be placed in 4 mm single layers and the treatment times are considerably reduced. However, aesthetic and mechanical properties and impact on microleakage of bulk-fill resins are still unclear.This systematic review and meta-analysis aimed to assess the risk of microleakage of direct posterior restorations made of bulk-fill versus conventional composite resins.Researches were performed on PubMed and Scopus databases. Eligible in vivo studies, published since 2006, were reviewed. Outcomes of marginal discoloration, marginal adaptation, and recurrent caries were considered to conduct the systematic review and meta-analysis. Secondary data were examined to implement additional analysis and assess the risk of bias.Eight randomized clinical trials were analyzed, involving 778 direct restorations. The summary of RCTs led to significant but inconsistent results; the marginal discoloration and recurrent caries were found to be improved respectively by 5.1 and 1.4%, whereas the marginal adaptation was reduced of 6.5%. Secondary analyses revealed that follow-up periods, the adhesive system used and the class of carious lesions evaluated are confounding factors, and they result in a risk of bias across studies.Bulk-fill composites are innovative materials for conservative dentistry and they can be used to reduce treatment steps and duration of operative times. There are insufficient data to explore the relationship between bulk-fill composites and microleakage and further investigations are needed.

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Section: Introductionmentioning

confidence: 99%

Microleakage of Direct Restorations-Comparisonbetween Bulk-Fill and Traditional Composite Resins:Systematic Review and Meta-Analysis

et al. 2021

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“…Hal et al properties such as translucency and surface gloss, both of which are influenced by the restorative material composition, 7 the type of inorganic filler particles, 10 distribution, index of refraction, 11,13 and the thickness of the composite restoration. 14 In the present study, xtra fil Bulk Fill composite showed least resistance to surface degradation after immersion in methyl ethyl ketone when compared to other groups. The reason for this value could be due to the higher amount of absorption of the solvent by the Bis-GMA molecule in x-tra fil matrix causing swelling of the material.…”

Section: Mansoura Journal Of Dentistrymentioning

confidence: 44%

Effect of Food Simulating Solvents on Surface Roughness and Microhardness of Bulk Fill Resin Composites.

hal¹,

Ashraf²,

El-Wassefy³

et al. 2022

Mansoura Journal of Dentistry

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Objective: To evaluate the effect of food simulating solvents on surface roughness and microhardness of bulk fill resin composites In Vitro. Materials and Methods: A total of 180 discs were made with (Filtek One bulk fill, REVEAL HD and x-tra fil bulk fill (n=60). The baseline data of surface roughness and microhardness measurements were recorded. Each group was divided into three subgroups, subgroup1 was immersed into methyl ethyl ketone (n=20), subgroup2 was immersed into ethanol (n=20) and, subgroup3 was immersed into artificial saliva (n=20) as control group. After 30 days, half of each subgroup was tested for surface roughness (n=10) by surface profilometer and the other half was tested for microhardeness (n=10) by Vicker's microhardness tester. The collected data were statistically analyzed using one-way analysis of variance (ANOVA) then Tukey's post hoc test for pairwise comparison (p ≤0.05). Results: All tested materials showed significant differences in surface roughness and microhardness. X-tra fil composite group had the most statistically significant increasing in surface roughness and the most significant decreasing in microhardness was in Filtek One Bulk. Methyl ethyl ketone caused the most surface changes in bulk fill resin composites. Conclusions: Bulk fill resin composites significantly increased in surface roughness and decreased in surface microhardness after Immersion in food simulating solvents.

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“…This fact can be justified by the composition of the organic matrix in these composites that allows greater dispersion of light or the presence of additional initiators that may consequently lead to favorable physical properties in the periphery. 24,25 The Valo LCU has four LEDs positioned in the different quarters of the tip diameter, which results in a nonuniform wavelength light beam emission because three LEDs emit blue light (two with peak emission at 460 nm and one with at 440 nm) and one LED emits violet light (peak emission at 405 nm). 20 Despite this fact, no differences in KHN were assessed in the center or periphery of the specimens for the bulk-fill resin composite with the additional initiator (Ivocerin).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Influence of Tip Diameter and Light Spectrum of Curing Units on the Properties of Bulk-Fill Resin Composites

et al. 2021

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Objective The aim of this study was to evaluate the influence of different light-curing units (LCUs) with distinct tip diameters and light spectra for activating bulk-fill resins. Materials and Methods The specimens (n = 10) were made from a conventional composite (Amaris, VOCO) and bulk-fill resins (Aura Bulk Fill, SDI; Filtek One, 3M ESPE; Tetric Bulk Fill, Ivoclar Vivadent) with two diameters, 7 or 10 mm, × 2 mm thickness. Following 24 hours of specimen preparation, the degree of conversion (DC) was evaluated using the Fourier-transform infrared unit. Knoop hardness (KHN) readings were performed on the center and periphery of the specimens. Data were assessed for homoscedasticity and submitted to one-way and three-way analysis of variance followed by the Tukey's and Dunnett's tests, depending on the analysis performed (α = 0.05). Results LCUs and specimen diameter significantly affected the DC. The Tetric Bulk Fill provided increased DC results when light-cured with Valo (54.8 and 53.5%, for 7 and 10 mm, respectively) compared with Radii Xpert (52.1 and 52.9%, for 7 and 10 mm, respectively). No significant differences in KHN results were noted for the conventional resin composite (Amaris) compared with LCUs (p = 0.213) or disc diameters (p = 0.587), but the center of the specimen exhibited superior KHN (p ≤ 0.001) than the periphery. Conclusion The light spectrum of the multipeak LCU (Valo) significantly increased the DC and KHN of the bulk-fill resin composite with additional initiator to camphorquinone (Tetric Bulk Fill) compared with the monowave LCU (Radii Xpert). The tip size of the LCUs influenced the performance of some of the resin composites tested.

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The Effect of Irradiance on the Degree of Conversion and Volumetric Polymerization Shrinkage of Different Bulk-Fill Resin-Based Composites: An In Vitro Study

Cited by 6 publications

References 29 publications

Microleakage of Direct Restorations-Comparisonbetween Bulk-Fill and Traditional Composite Resins:Systematic Review and Meta-Analysis

Microleakage of Direct Restorations-Comparisonbetween Bulk-Fill and Traditional Composite Resins:Systematic Review and Meta-Analysis

Effect of Food Simulating Solvents on Surface Roughness and Microhardness of Bulk Fill Resin Composites.

Influence of Tip Diameter and Light Spectrum of Curing Units on the Properties of Bulk-Fill Resin Composites

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