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

Tomlins, P H; Palin, W M*; Shortall, A C*; Wang, R K* (2007) Time-resolved simultaneous measurement of group index and physical thickness during photopolymerization of resin-based dental composite. J. Biomed. Opt., 12 (1). 014020

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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 maximum extent of cure. Insufficient curing can contribute to an overall reduction in bio-compatibility of the material. In this article we demonstrate dynamic refractive index measurements of a commercial dental composite throughout cure using spectral domain low coherence interferometry. Our results appear to show that the refractive index change observed during the curing process is primarily due to the physical shrinkage of the material rather than polymerisation. This has implications for composite design where index matching between the resin and filler particles is key to optimisation of the curing depth.

Item Type: Article
Keywords: low coherence interferometry, resin-based composite, dental materials, optical coherence tomography, refractive index measurement, polymerization
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Bio-Medical
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/3900

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