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Polymers 2011, 3(3), 998-1005; doi:10.3390/polym3030998

The Effects of Exposure Time on the Surface Microhardness of Three Dual-Cured Dental Resin Cements

Received: 20 May 2011 / Revised: 13 June 2011 / Accepted: 20 June 2010 / Published: 28 June 2011
(This article belongs to the Special Issue Polymers for Oro-Dental and Cranio- Maxillo-Facial Applications)
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This study evaluated the exposure time of light-curing of the polymers used for cementation on microhardness test in different storage times. The polymers (specifically called resin cements) were RelyX ARC, RelyX U100, and SET. Five specimens of each group were prepared and photo-polymerized with exposure times of 20 s and 180 s, using a LED polymerization unit with wavelength of 440 ~ 480 nm and light output was consistently 1,500 mW/cm2. The Vickers hardness test was performed in a MMT-3 Microhardness Tester. Data were submitted to ANOVA and Tukey's test (α = 0.05). The values of RelyX ARC showed statistically significant difference to groups with light exposure when considering only chemical cure (p < 0.05). The groups with light exposure (20 s and 180 s) showed no significant difference between them (p > 0.05). The RelyX U100 cured only chemically showed statistically significant difference between 48 h and 7 days (p < 0.05). The SET resin cement showed no significant difference to groups without light exposure for all storage times (p > 0.05). The values of hardening of the dual-cured resin cements improved after setting by light and chemical activation demonstrating the importance of light curing.
Keywords: polymers; photo-responsive polymers; hardness polymers; photo-responsive polymers; hardness
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.

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Aguiar, T.C.; Saad, J.R.C.; Pinto, S.C.S.; Calixto, L.R.; Lima, D.M.; Silva, M.A.S.; Bandéca, M.C. The Effects of Exposure Time on the Surface Microhardness of Three Dual-Cured Dental Resin Cements. Polymers 2011, 3, 998-1005.

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