Time-resolved simultaneous measurement of group index and physical thickness during photopolymerization of resin-based dental composite

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Colleges, School and Institutes


Light-activated resin-based dental composites are increasingly replacing dental amalgam. However, these materials are limited by inefficient setting reactions as a function of depth that constrain the maximum extent of cure. Insufficient curing can contribute to an overall reduction in biocompatibility of the material. We demonstrate dynamic refractive index measurements of a commercial dental composite throughout cure using spectral domain low coherence interferometry. Our results show a linear relationship between the change in refractive index and polymerization-induced reduction in physical thickness during light-activated curing. This relationship between the optical and physical density demonstrates the potential of this technique as a unique noninvasive tool for measurement of the conversion degree of curing dental composite materials.


Original languageEnglish
Pages (from-to)014020
Number of pages1
JournalJournal of Biomedical Optics
Issue number1
Publication statusPublished - 1 Jan 2007