Authors: Petrović, Ljubomir
Zorica, Dušan 
Stojanac, Igor
Krstonosić, Veljko
Hadnadjev, Miroslav
Janev, Marko 
Premović, Milica
Atanacković, Teodor
Affiliations: Mathematical Institute of the Serbian Academy of Sciences and Arts 
Title: Viscoelastic properties of uncured resin composites: Dynamic oscillatory shear test and fractional derivative model
Journal: Dental Materials
Volume: 31
Issue: 8
First page: 1003
Last page: 1009
Issue Date: 1-Jan-2015
Rank: M21a
ISSN: 0109-5641
DOI: 10.1016/j.dental.2015.05.009
Abstract: 
Objective In this study we analyze viscoelastic properties of three flowable (Wave, Wave MV, Wave HV) and one universal hybrid resin (Ice) composites, prior to setting. We developed a mathematical model containing fractional derivatives in order to describe their properties. Methods Isothermal experimental study was conducted on a rheometer with parallel plates. In dynamic oscillatory shear test, storage and loss modulus, as well as the complex viscosity where determined. We assumed four different fractional viscoelastic models, each belonging to one particular class, derivable from distributed-order fractional constitutive equation. The restrictions following from the Second law of thermodynamics are imposed on each model. The optimal parameters corresponding to each model are obtained by minimizing the error function that takes into account storage and loss modulus, thus obtaining the best fit to the experimental data. Results In the frequency range considered, we obtained that for Wave HV and Wave MV there exist a critical frequency for which loss and storage modulus curves intersect, defining a boundary between two different types of behavior: one in which storage modulus is larger than loss modulus and the other in which the situation is opposite. Loss and storage modulus curves for Ice and Wave do not show this type of behavior, having either elastic, or viscous effects dominating in entire frequency range considered. Significance The developed models may be used to predict behavior of four tested composites in different flow conditions (different deformation speed), thus helping to estimate optimal handling characteristics for specific clinical applications.
Keywords: Dynamic oscillatory shear test | Flowable and universal hybrid resin | Resin composites | Uncured | Viscoelasticity of fractional order
Publisher: Elsevier
Project: Viscoelasticity of fractional type and shape optimization in a theory of rods 
Integrated system for detection and estimation of fire development by real-time monitoring of critical parameters 
Development of Dialogue Systems for Serbian and Other South Slavic Languages 
Secretariat for Science of Vojvodina, Grant 114-451-1084

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