Zirconia enriched dental adhesive: A solution for OCT contrast enhancement. Demonstrative study by synchrotron radiation microtomography

Rominu, M. and Manescu, A. and Sinescu, C. and Negrutiu, M.L. and Topala, F. and Rominu, R.O. and Bradu, Adrian and Jackson, David A. and Giuliani, A. and Podoleanu, Adrian G.H. (2014) Zirconia enriched dental adhesive: A solution for OCT contrast enhancement. Demonstrative study by synchrotron radiation microtomography. Dental Materials, 30 (4). pp. 417-423. ISSN 0109-5641. (doi:https://doi.org/10.1016/j.dental.2014.01.004) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided)

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Abstract

Objective The major aim of this study was to prove the capability of the optical coherence tomography (OCT) method in visualizing the integrity of the adhesive fillings and of the interfaces between the adhesive, tooth structures and composite resin. As zirconium dioxide was added to the composition of the adhesive layer in order to strengthen the backscattered light in the OCT investigation, for a better visualization of the interfaces, the determination of a proper zirconia concentration was another aim of our study. Method Several class II cavities were prepared in human premolars and were filled with dental adhesive containing different zirconia concentrations and light-curing composite resin. Both OCT and synchrotron radiation microtomography (micro-CT) were used to analyse the morphology of the tooth-adhesive-composite interfaces and to investigate the adhesive layer. Results The pore distribution, both at the interfaces level and in the resin, and the analysis of the adhesive layer integrity were obtained. A good agreement between OCT and micro-CT analyses was observed in terms of detecting discontinuities in the adhesive layer. Furthermore, micro-CT showed that zirconia percentages in the adhesive higher than 20 vol.% lead to conglomerates formation, which can negatively influence mechanical properties. Meanwhile, OCT confirmed a factor of 3 for the contrast enhancement when 20% of zirconia was included in the adhesive composition. Significance The present study proved the capability of the OCT method in visualizing the morphology and integrity of zirconia doped tooth adhesive fillings, to be used for a further in vivo tool development. © 2014 Academy of Dental Materials.

Item Type: Article
Additional information: Embargo period of 12 expired April 2015. This is available as OPEN ACCESS by clicking on the URL.
Uncontrolled keywords: Contrast enhancement, Medical imaging, Optical coherence tomography, Synchrotron radiation, Tooth adhesive, X-ray microtomography, Adhesives, Computerized tomography, Dental materials, Mechanical properties, Medical imaging, Morphology, Optical tomography, Resins, Synchrotron radiation, Adhesive compositions, Backscattered light, Contrast Enhancement, Dental adhesives, Pore distribution, Synchrotron radiation microtomography, X ray microtomography, Zirconium dioxide, Zirconia
Subjects: Q Science > QC Physics
R Medicine > R Medicine (General) > R857.O6 Optical coherence tomography
R Medicine > RK Dentistry
Divisions: Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Depositing User: Giles Tarver
Date Deposited: 15 Jul 2015 08:46 UTC
Last Modified: 08 May 2018 08:53 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49306 (The current URI for this page, for reference purposes)
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