J Dent 2003 Feb;31(2):97-103
Research and Development, Bisco Inc., Schaumburg, IL 60193, USA.
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 40s 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.