Viscosity and thermal kinetics of 10 preheated restorative resin composites and effect of ultrasound energy on film thickness

Marcondes, Rogério L.; Lima, Verônica P.; Barbon, Fabíola Jardim; Isolan, Cristina Pereira; Carvalho, Marcelo Addas de; Salvador, Marcos V.; Lima, Adriano Fonseca; Moraes, Rafael R.

doi:10.1016/j.dental.2020.08.004

Cited by 46 publications

(108 citation statements)

References 33 publications

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“…However, a study by Marcondes et al showed that this may not always be the case. Some low-viscosity resins may have film thicknesses as high as 119 µm [8]. In this study, no relationships were found between filler content, viscosity, and film thickness.…”

Section: Introductioncontrasting

confidence: 56%

Effect of Die Spacer Thickness on the Microshear Bond Strength of CAD/CAM Lithium Disilicate Veneers

Farag

Ghoneim

Afifi

2021

International Journal of Dentistry

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Aim. The aim of this study was to compare the microshear bond strength of ceramic veneers with digital die spacer settings at 20, 40, and 100 µm. Materials and Methods. Eighteen milled lithium disilicate microdiscs (IPS e.max CAD, Ivoclar Vivadent) were divided into three groups (n = 6) according to their digital die spacer settings: group A = 20 µm, group B = 40 µm, and group C = 100 µm. Six randomly selected sound maxillary premolars received three microdiscs each. Each microdisc was 1 mm in diameter and 1 mm in height. The buccal surfaces of the premolars were prepared with a 0.5 mm depth in enamel. After cementation, the specimens were thermocycled for 2,500 cycles between 5 and 55°C. Microshear bond strength testing was performed using a universal testing machine until bonding failure. Failure modes were evaluated using a stereomicroscope. Statistical analyses included one-way ANOVA, Tukey’s post hoc test, and chi-square test with a 5% alpha error and 80% study power. Results. The mean microshear bond strength values were calculated in MPa for group A = 31.91 ± 12.41, group B = 29.58 ± 5.03, and group C = 13.85 ± 4.12. One-way ANOVA ( p ≤ 0.05 ) showed a statistically significant difference in microshear bond strength among the three groups. Tukey’s post hoc test showed significant differences between groups A and C ( p = 0.004 ) and between groups B and C ( p = 0.011 ). The failure modes were presented as cohesive, adhesive, and mixed failures. Chi-square test indicated that the failure mode distribution was not significantly different among the three groups ( p = 0.970 ). Conclusion. Higher digital die spacer settings decrease the microshear bond strength of CAD/CAM lithium disilicate veneers.

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Section: Introductioncontrasting

confidence: 56%

Effect of Die Spacer Thickness on the Microshear Bond Strength of CAD/CAM Lithium Disilicate Veneers

Farag

Ghoneim

Afifi

2021

International Journal of Dentistry

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“…This delivery system can warm up the filling material in seconds using near-infrared technology and allows immediate application without removal of the capsule from the heating device thereby maintaining its increased temperature [ 26 ]. Although VisCalor Bulk is a relatively new RBC, it has already been the subject of several investigations [ 27 , 28 , 29 , 30 , 31 ]. Yang et al examined the effects of temperature on stickiness and packability, and the effect of pre-heating time on pre-cure properties.…”

Section: Introductionmentioning

confidence: 99%

“…VisCalor Bulk showed the greatest extent of viscosity reduction at 69 °C, while film thickness could not be reduced below 50 μm without the use of ultrasound. This study also claimed that to take full advantage of the pre-heated RBCs, the ideal working time is merely 10–15 s [ 29 ]. Demirel et al investigated the effect of different insertion techniques on the internal void formation and found VisCalor Bulk to show the lowest void percentage with the utilization of the pre-heating technique [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Pre-Heating Effect on Monomer Elution and Degree of Conversion of Contemporary and Thermoviscous Bulk-Fill Resin-Based Dental Composites

et al. 2021

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Detection of unreacted monomers from pre-heated resin-based dental composites (RBC) is not a well-investigated topic so far. The objectives were to determine the temperature changes during the application and polymerization, the degree of conversion (DC) and unreacted monomer elution of room temperature (RT), and pre-heated thermoviscous [VisCalor Bulk(VCB)] and high-viscosity full-body contemporary [Filtek One Bulk(FOB)] bulk-fill RBCs. The RBCs’ temperatures during the sample preparation were recorded with a K-type thermocouple. The DC at the top and bottom was measured with micro-Raman spectroscopy and the amounts of eluted BisGMA, UDMA, DDMA, and TEGDMA were assessed with High-Performance Liquid Chromatography. The temperatures of the pre-heated RBCs decreased rapidly during the manipulation phase. The temperature rise during photopolymerization reflects the bottom DCs. The differences in DC% between the top and the bottom were significant. RT VCB had a lower DC% compared to FOB. Pre-heating did not influence the DC, except on the bottom surface of FOB where a significant decrease was measured. Pre-heating significantly decreased the elution of BisGMA, UDMA, DDMA in the case of FOB, meanwhile, it had no effect on monomer release from VCB, except TEGDMA, which elution was decreased. In comparison, RBC composition had a stronger influence on DC and monomer elution, than pre-cure temperature.

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“…The viscosity of resin luting cement can be easily adjusted by changing the ratio of the resin matrix and filler particles [ 123 ]. Marcondes et al [ 124 ] compared the viscosity of a flowable resin composite, Opallis Flow (FCG), two resin luting cements, RelyX Veneer (3M ESPE) and Variolink Esthetic LC (Ivoclar Vivadent), and they found that the viscosity of the flowable resin composite was smaller than those of the resin luting cement at the same temperature. When the temperature was set at 69 °C in their experiment, the viscosity of flowable composite was about 120–140 Pa·s, while the viscosity of resin luting cement ranged from 220 Pa·s to 1010 Pa·s.…”

Section: Resin Luting Cementmentioning

confidence: 99%

Rheological and Mechanical Properties of Resin-Based Materials Applied in Dental Restorations

Zhang

Meng

et al. 2021

Polymers

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Resin-based materials have been prevalent for dental restorations over the past few decades and have been widely used for a variety of direct and indirect procedures. Typically, resin-based dental materials are required to be flowable or moldable before setting and can provide adequate mechanical strength after setting. The setting method may include, but is not limited to, light-curing, self-curing or heating. In this review, based on different indications of resin-based dental materials (e.g., dental filling composite, dental bonding agent, resin luting cement), their rheological and mechanical properties were reviewed. Viscous and flexible properties were focused on for materials before setting, while elastic properties and mechanical strength were focused on for materials after setting. At the same time, the factors that may affect their rheological and mechanical properties were discussed. It is anticipated that the insightful information and prospections of this study will be useful to the future development and fabrication of resin-based dental restorative materials.

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Viscosity and thermal kinetics of 10 preheated restorative resin composites and effect of ultrasound energy on film thickness

Cited by 46 publications

References 33 publications

Effect of Die Spacer Thickness on the Microshear Bond Strength of CAD/CAM Lithium Disilicate Veneers

Effect of Die Spacer Thickness on the Microshear Bond Strength of CAD/CAM Lithium Disilicate Veneers

Pre-Heating Effect on Monomer Elution and Degree of Conversion of Contemporary and Thermoviscous Bulk-Fill Resin-Based Dental Composites

Rheological and Mechanical Properties of Resin-Based Materials Applied in Dental Restorations

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