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Materials 2018, 11(7), 1180; https://doi.org/10.3390/ma11071180

Simultaneous Evaluation of Creep Deformation and Recovery of Bulk-Fill Dental Composites Immersed in Food-Simulating Liquids

1
Restorative Dental Sciences Department, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia
2
Engineer Abdullah Bugshan research chair for Dental and Oral Rehabilitation, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia
3
Dental intern, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia
4
Applied Medical Science Department, Community College, King Saud University, Riyadh 11545, Saudi Arabia
5
Department of Biomedical Engineering, Faculty of Engineering, Helwan University, Helwan 11792, Egypt
6
Dental Biomaterials Research Chair, King Saud University, Riyadh 11433, Saudi Arabia
7
Dentistry, School of Medical Sciences, University of Manchester, Manchester M13 9PL, UK
*
Author to whom correspondence should be addressed.
Received: 6 June 2018 / Revised: 27 June 2018 / Accepted: 28 June 2018 / Published: 10 July 2018
(This article belongs to the Collection Dental Biomaterials)
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Abstract

The aim of this study is to compare the creep/recovery behavior of bulk-fill dental composites after storage in various food simulating organic solvents. For this purpose, five different resin-composites (four bulk-fills and one conventional) were used. A total of 20 rectangular specimens (14 mm × 3 mm × 0.7 mm) were prepared by filling the resin-composites in Teflon mold. All of the specimens for each material (n = 5) were divided into four groups namely dry (control), distilled water (DW), artificial saliva, and absolute ethanol. The specimens were subjected to three-point bending creep test during immersion directly. A constant load of 2 N was used for each specimen with loading and unloading time 2 h each. Results: SF2 and XF showed a lower creep strain % after immersion, ranging from 0.44 (dry) to 0.75 (saliva) and 0.43 (dry) to 0.80 (ethanol), respectively. TNC BF depicts the maximum creep strain % ranging from 1.24% (dry) to 2.87% (ethanol) followed by FBF ranging from 1.17 (dry) to 2.59 (ethanol). However, the conventional material (GR) showed lower creep strain after immersion ranging from 0.28 to 0.54. Moreover, SF2 resulted in the highest creep recovery in all of the composites groups, as well as conventional material. The other composite groups showed lower creep recovery as compared to the conventional material (GR). The creep strain % for all the bulk-fill composites materials were increased during immersion in the liquids. However, for the conventional material, the creep deformation is decreased after immersion. SF2 showed the highest percentage of creep recovery among the bulk-fill composites, followed by XF. View Full-Text
Keywords: bulk-fill; viscoelastic properties; creep; resin-composite; food-simulating organic solvents; dynamic mechanical analyzer bulk-fill; viscoelastic properties; creep; resin-composite; food-simulating organic solvents; dynamic mechanical analyzer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Alrahlah, A.; Khan, R.; Alotaibi, K.; Almutawa, Z.; Fouad, H.; Elsharawy, M.; Silikas, N. Simultaneous Evaluation of Creep Deformation and Recovery of Bulk-Fill Dental Composites Immersed in Food-Simulating Liquids. Materials 2018, 11, 1180.

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