Journal
JOURNAL OF DENTISTRY
Volume 31, Issue 2, Pages 97-103Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0300-5712(03)00005-8
Keywords
composite; video-imaging; volumetric shrinkage; kinetics; light curing
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Objective. This study involves investigation of the use of video-imaging for measurement of volumetric shrinkage of composites. Methods. Six composites were tested for volumetric shrinkage using video-imaging. The volumetric shrinkage was measured using the single- and multi-view volumetric reconstruction modes. All composites were cured using a VIP(TM) curing light for 40 s at 500 mW/cm(2). Dynamic shrinkage was measured using the single-view mode with a red filter placed over the detector opening. Results. Analysis of the volumetric shrinkage values by a one way ANOVA for each composite showed no difference for the single- and multi-view measurement mode. The shrinkage values determined by video-imaging were compared to those measured for the same composites by mercury dilatometry by one way ANOVA followed by a paired comparison using the Bonferroni method. Conclusion. The video-imaging technique gives reproducible results for volumetric shrinkage of composites comparable to those measured by dilatometry. (C) 2003 Elsevier Science Ltd. All rights reserved.
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