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International Journal of Dentistry
Volume 2012, Article ID 317509, 5 pages
http://dx.doi.org/10.1155/2012/317509
Research Article

Surface Hardness of Resin Cement Polymerized under Different Ceramic Materials

1Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hatyai, Songkhla 90112, Thailand
2Esthetic Restorative and Implant Dentistry Program, Faculty of Dentistry, Chulalongkorn University, Henri-Dunant Road, Patumwan, Bangkok 10330, Thailand

Received 3 November 2011; Revised 26 December 2011; Accepted 17 January 2012

Academic Editor: J. Anthony Von Fraunhofer

Copyright © 2012 Pimmada Kesrak and Chalermpol Leevailoj. 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.

Abstract

Objectives. To evaluate the surface hardness of two light-cured resin cements polymerized under different ceramic discs. Methods. 40 experimental groups of 2 light-cured resin cement specimens (Variolink Veneer and NX3) were prepared and polymerized under 5 different ceramic discs (IPS e.max Press HT, LT, MO, HO, and Cercon) of 4 thicknesses (0.5, 1.0, 1.5, and 2.0 mm), Those directly activated of both resin cements were used as control. After light activation and 3 7 C storage in an incubator, Knoop hardness measurements were obtained at the bottom. The data were analyzed with three-way ANOVA, t-test, and one-way ANOVA. Results. The KHN of NX3 was of significantly higher than that of Variolink Veneer ( 𝑃 < 0 . 0 5 ). The KHN of resin cement polymerized under different ceramic types and thicknesses was significant difference ( 𝑃 < 0 . 0 5 ). Conclusion. Resin cements polymerized under different ceramic materials and thicknesses showed statistically significant differences in KHN.