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The American Journal of Esthetic Dentistry

Edited by Richard J. Simonsen, DDS, MS

ISSN 2162-2833 (print) • ISSN 2162-2841 (online)

The American Journal of Esthetic Dentistry
Spring 2012
Volume 2 , Issue 1

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Effect of Food-Simulating Liquids on Hardness, Roughness, and Water Sorption and Solubility of Sealed Composite Resins

Shaymaa E. Elsaka, BDS (Hons), MDS, PhD

Pages: 32-43

This study evaluated the effect of food-simulating liquids (FSLs) on hardness, roughness, and water sorption (Wsp) and solubility (Wsl) of different classes of composite resins with and without surface sealant application. Seventy specimens per restorative material were fabricated in customized molds for each test type and equally divided into two groups: sealed composite resin and unsealed composite resin. Each group was further divided equally into seven subgroups according to the storage solution. The test groups were conditioned for 1 week at 37C in the following FSLs: (a) artificial saliva (control), (b) 0.02 N citric acid, (c) heptane, (d) 25% ethanol solution (ES), (e) 50% ES, (f) 75% ES, and (g) 100% ES. After conditioning, surface microhardness was determined with a Vickers microhardness tester, and surface roughness was measured with a profilometer. Wsp and Wsl were calculated by weighing the specimens before and after immersion and desiccation. Data were analyzed using analysis of variance, the Tukey test, and independent t tests. The results showed that all FSLs except heptane reduced surface microhardness for all composite resins. Sealed composite resins presented lower roughness and Wsp and Wsl values compared with unsealed composite resins. The application of a surface sealant could be a useful clinical procedure to improve the performance of dental composite resins exposed to various dietary solvents. (Am J Esthet Dent 2012;2:32-43.)

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