Viscoelastic properties of uncured resin composites: Dynamic oscillatory shear test and fractional derivative model

Petrović, Ljubomir; Zorica, Dušan; Stojanac, Igor; Krstonošić, Velјko; Hadnadjev, Miroslav; Janev, Marko; Premović, Milica; Atanacković, Teodor M.

doi:10.1016/j.dental.2015.05.009

Cited by 12 publications

(8 citation statements)

References 19 publications

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“…The addition of the nanofillers to the flowable composite greatly affect the handling properties of the composite including viscosity (11) . In the present study, the effects of different percentages of filler loading and effect of temperature at both (25˚C) and (37˚C) on the viscosity of flowable composite were investigated.…”

Section: Discussionmentioning

confidence: 99%

Effect of Zirconia and Alumina Nanofillers on the Microstructure and Some Properties of Flowable Composite

Hafez

Masoud²,

Tayeb

2019

ADJ-for Girls

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PURPOSE:This study was conducted to evaluate the effect of reinforcing flowable composite with different concentrations of zirconia and alumina nanofillers on its microstructure, complex viscosity, colour changes, flexural strength and degree οf cοnversiοn. MATERIALS AND METHODS: 200 samples were divided according to nanofillers type into two groups (n=100), each group was subdivided into five subgroups according to concentration of fillers (0%, 2%,4%,8%and16%)(n=20). Each subgroup was subdivided into 4 subdivisions according to type of test performed (n=5).Samples were characterized by SEM, viscosity was measured by oscillatory rheοmeter, colour changes was measured using spectrophotometer, flexural strength was measured by three point bending test and degree of conversion was measured by FTΙR. RESULTS:SEM showed homogenous distribution of zircοnia and alumina np at 2&4wt%, some agglomeration for both types of fillers at 8wt%. For complex viscosity, zirconia np at 16wt%at 25℃ had higher median value compared to 37℃(6.17),Alumina np at 2wt% and 4wt% at 25℃ had higher median value compared to 37℃(5.665),(8.516) respectively. For colour changes, zr& al np at 4wt% showed the highest mean values (10.2±1.5,11.1±1.4)respectively. Ιn flexural strength, zirconia filler at 4wt% had higher mean value(137.8±18.1MPa)compared to alumina filler(94.4±16.9MPa). For DC,4wt% for both zr& al np showed the highest mean values compared to other groups(66.4±2.4,64.3±0.82) respectively. CONCLUSION: Viscosity increased as the concentration of nanofillers increased. Ιncorporation of nanofillers affected the cοlour of the flowable composite. Flexural strength was improved with increasing the concentration of zirconia nanofillers, while it decreased with alumina nanofillers. DC increased as the filler concentration increased till 4 wt.% then decreased.

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Section: Discussionmentioning

confidence: 99%

Effect of Zirconia and Alumina Nanofillers on the Microstructure and Some Properties of Flowable Composite

Hafez

Masoud²,

Tayeb

2019

ADJ-for Girls

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“…Lacey et al [12] also noticed the wide standard deviations when it comes to viscosity measurements of RCS. On the other hand, in the studies of Petrovic et al [14,15] where onecomponent dental materials were tested (composite materials), using the same experimental method, the reproducibility of frequency sweep test was satisfactory. Rheological properties of two-component https://doi.org/10.37358/MP.22.2.5596 materials are highly sensitive indicator of any change such as: variations in the amount of each component, mixing technique, mixing time, measurements time, temperature and humidity.…”

Section: Resultsmentioning

confidence: 89%

“…The test methods used in the study are previously described in [14,15,23]. Dynamic oscillatory measurements were performed using a HAAKE Mars Rheometer (Thermo Fisher Scientific, Karlsruhe, Germany) and parallel plates geometry (diameter of 20mm) at 25°C (room temperature), 35°C (intracanal temperature), 40 and 65°C.…”

Section: Rheological Testsmentioning

confidence: 99%

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The Influence of Temperature on Rheological Properties of Three Root Canal Sealers

Cvjeticanin¹,

Zorica²,

Krstonošić³

et al. 2022

Mater. Plast.

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Purpose was to determine the viscoelastic properties of three root canal sealers as a function of temperature, time and frequency using dynamic oscillatory measurements. Methods: Measurements were performed on the dynamic oscillatory rheometer set to temperatures: 25�C, 35�C, 40�C and 65�C. Stress sweep and frequency sweep tests were used in order to determine storage moduli G�, loss moduli G�� and complex viscosity η*. Results Higher values of storage compared to loss moduli indicate the more pronounced solid-like behavior of tested materials. EndoREZ showed the highest values of G� and G�� moduli at all temperatures. With temperature increase the G� and G�� moduli of Sealapex and EndoREZ increased while the moduli of AH Plus decreased. With frequency increase all materials showed viscosity decrease exhibiting non-Newtonion, shear-thinning behavior. With temperature increase AH Plus demonstrated viscosity decrease, while the viscosity of Sealapex and EndoREZ increased. Clinical significance: All tested materials were temperature, time and frequency dependent and this dependency varied between them. The obtained results may be used to predict the rheological behavior of root canal sealers in different temperature conditions, thus helping as to estimate optimal handling characteristics for specific clinical applications.

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“…Other authors who also used fractional‐order models to study food viscosity were Yang et al (2018) applied a fractional‐order model to colloids to characterize the apparent viscosity of thixotropic materials, in which the order of the fractional derivative was designed to describe their historical dependence, that is, nonlocal properties, and Yang et al (2017) proposed a fractional derivative model for cellulose and milk viscosity, by generalizing the order of the Hooke's Law model for thixotropic fluids. As in the previous work, the authors generalize the order of the model by derivatives of Rieman–Liouville; Dapčević Hadnadev et al (2013) proposed a viscosity model, generalized the order of the model by Caputo derivatives, and adjusted the two models to study the influence of sodium starch octenyl succinate on the rheological behavior of wheat flour dough systems; Petrovic et al (2015) aimed to generalize the order of differentiation of Newton and Zener models and to adjust to the experimental data of three types of resin;(Orczykowska & Dziubinski, 2012) fitted a classic model and a fractional order model for the viscosity of colloids consisting of xanthan gum, rice starch and potato starch, and; (Lawal et al, 2011), adjusted a generalized order model based on Newton's law of viscosity to study rheological characteristics of fluids.…”

Section: Resultsmentioning

confidence: 99%

Fractional calculus to control transport phenomena in food engineering: A systematic review of barriers and data agenda

Matias

Lermen

Bissaro

et al. 2022

J Food Process Engineering

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This study aims to conduct a systematic review of the literature through bibliometrics and content analysis to raise barriers, data agenda, and a framework to support academics and practitioners of fractional calculus in transport phenomena from the perspectives of food engineering. The structure of the methodological procedure is a selection of studies in the research area, statistical analysis of the data, and content analysis. The Bibliometrix package of software R was used in the bibliometric analysis, being fundamental for the organization of the discussions. Finally, the food engineering area researchers can use the questions, barriers, and research agenda in fractional calculus to solve problems in the studied clusters' processes. Based on the previous knowledge of the researcher, a path was provided to follow the data agenda and the proposed framework, identify insights, and solve a specific problem. As the main contribution, this study presents several applications and the most significant barriers and presents bibliometrics quantifying the theoretical and empirical studies in the area. Nonetheless, this study places the research field of fractional calculus for Food Engineering, Science, and Technology, presenting several applications and the most significant barriers quantifying the theoretical and empirical studies in the area. As a practical contribution, this study presents a research agenda and a framework that can contribute to practitioners applying fractional calculus in process control.

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Viscoelastic properties of uncured resin composites: Dynamic oscillatory shear test and fractional derivative model

Cited by 12 publications

References 19 publications

Effect of Zirconia and Alumina Nanofillers on the Microstructure and Some Properties of Flowable Composite

Effect of Zirconia and Alumina Nanofillers on the Microstructure and Some Properties of Flowable Composite

The Influence of Temperature on Rheological Properties of Three Root Canal Sealers

Fractional calculus to control transport phenomena in food engineering: A systematic review of barriers and data agenda

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