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Journal of Biomedical Optics

Time-resolved simultaneous measurement of group index and physical thickness during photopolymerization of resin-based dental composite
Author(s): Peter H. Tomlins; Will M. Palin; Adrian C. Shortall; Ruikang K. Wang
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Paper Abstract

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.

Paper Details

Date Published: 1 January 2007
PDF: 7 pages
J. Biomed. Opt. 12(1) 014020 doi: 10.1117/1.2709877
Published in: Journal of Biomedical Optics Volume 12, Issue 1
Show Author Affiliations
Peter H. Tomlins, National Physical Lab. (United Kingdom)
Will M. Palin, The Univ. of Birmingham (United Kingdom)
Adrian C. Shortall, The Univ. of Birmingham (United Kingdom)
Ruikang K. Wang, Oregon Health and Science Univ. (United States)

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