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

Peter H. Tomlins; Will M. Palin; Adrian C. Shortall; Ruikang K. Wang

doi:10.1117/1.2709877

1 January 2007 Time-resolved simultaneous measurement of group index and physical thickness during photopolymerization of resin-based dental composite

Peter H. Tomlins, Will M. Palin, Adrian C. Shortall, Ruikang K. Wang

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Journal of Biomedical Optics, Vol. 12, Issue 1, 014020 (January 2007). https://doi.org/10.1117/1.2709877

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.

©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Peter H. Tomlins, Will M. Palin, Adrian C. Shortall, and Ruikang K. Wang "Time-resolved simultaneous measurement of group index and physical thickness during photopolymerization of resin-based dental composite," Journal of Biomedical Optics 12(1), 014020 (1 January 2007). https://doi.org/10.1117/1.2709877

Published: 1 January 2007

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KEYWORDS

Refractive index

Composites

Polymerization

Composite resins

Polymers

Fourier transforms

Lamps

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