Abstract
The viscoelastic properties of three commercially available resin-based composites (Filtek™ P60, Filtek™ Supreme, and Filtek™ Z250; 3M ESPE, Bracknell, UK) were measured to determine the effect of beverages on their storage moduli and damping ratios. Rectangular samples of the three hybrid composites were immersed in three beverages at 37 °C for 1, 7, 30, and 60 days. At each time interval, these samples were subjected to three-point bend tests in temperature mode using a Perkin Elmer DMA7 Dynamic Mechanical Analyzer (Perkin Elmer Corp., Waltham, MA, USA) to measure the storage modulus and damping ratio. The immersion time had significant influence on the viscoelastic property of composites and it was found that generally for all samples the storage modulus was reduced, whereas damping values increased with immersion time. The viscoelastic behavior of tested materials seems to be related to the pH environment, hydrophilicity and the chemical composition of composites.
Highlights
Resin-based composite (RBC), as a dental restorative material, is heterogeneous and isotropic [1].It is a polymer-based material, which transforms from a liquid to a rubbery-glassy state on polymerization
The mean storage modulus (E′) and mechanical damping of all the groups along with their standard deviations are given in Figures 1 and 2, respectively
Samples immersed in apple juice (AJ) and Coca-Cola (CC) showed significant decrease in values as compare to deionized water (DW)
Summary
Resin-based composite (RBC), as a dental restorative material, is heterogeneous and isotropic [1]. It is a polymer-based material, which transforms from a liquid to a rubbery-glassy state on polymerization. Factors that may influence the speed of this reaction include the type of material’s chemical bond, copolymer composition, hydrophilicity of the polymer matrix and the pH of the erosive agents [2]. Several researchers [4,5,6,7,8] have investigated the effects of food-simulating liquids on the properties of dental composites, to date, the effects of these agents on the viscoelastic properties of the restorative materials have not been tested
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