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BioMed Research International
Volume 2016, Article ID 4894653, 10 pages
Research Article

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

Department of Preventive, Restorative, and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, 3010 Bern, Switzerland

Received 19 September 2016; Revised 11 November 2016; Accepted 17 November 2016

Academic Editor: Hwa-Liang Leo

Copyright © 2016 Anne Peutzfeldt et al. 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.


This study investigated the influence of light-curing at high irradiances on micromechanical properties of resin cements. Three dual-curing resin cements and a light-curing flowable resin composite were light-cured with an LED curing unit in Standard mode (SM), High Power mode (HPM), or Xtra Power mode (XPM). Maximum irradiances were determined using a MARC PS radiometer, and exposure duration was varied to obtain two or three levels of radiant exposure (SM: 13.2 and 27.2 J/cm2; HPM: 15.0 and 30.4 J/cm2; XPM: 9.5, 19.3, and 29.7 J/cm2) (). Vickers hardness () and indentation modulus () were measured at 15 min and 1 week. Data were analyzed with nonparametric ANOVA, Wilcoxon-Mann-Whitney tests, and Spearman correlation analyses (). Irradiation protocol, resin-based material, and storage time and all interactions influenced and significantly (). Statistically significant correlations between radiant exposure and or were found, indicating that high-irradiance light-curing has no detrimental effect on the polymerization of resin-based materials (). However, one resin cement was sensitive to the combination of irradiance and exposure duration, with high-irradiance light-curing resulting in a 20% drop in micromechanical properties. The results highlight the importance of manufacturers issuing specific recommendations for the light-curing procedure of each resin cement.