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Proceedings Paper

Swept source optical coherence tomography for quantitative and qualitative assessment of dental composite restorations
Author(s): Alireza Sadr; Yasushi Shimada; Juan Ricardo Mayoral; Ilnaz Hariri; Turki A. Bakhsh; Yasunori Sumi; Junji Tagami
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Paper Abstract

The aim of this work was to explore the utility of swept-source optical coherence tomography (SS-OCT) for quantitative evaluation of dental composite restorations. The system (Santec, Japan) with a center wavelength of around 1300 nm and axial resolution of 12 μm was used to record data during and after placement of light-cured composites. The Fresnel phenomenon at the interfacial defects resulted in brighter areas indicating gaps as small as a few micrometers. The gap extension at the interface was quantified and compared to the observation by confocal laser scanning microscope after trimming the specimen to the same cross-section. Also, video imaging of the composite during polymerization could provide information about real-time kinetics of contraction stress and resulting gaps, distinguishing them from those gaps resulting from poor adaptation of composite to the cavity prior to polymerization. Some samples were also subjected to a high resolution microfocus X-ray computed tomography (μCT) assessment; it was found that differentiation of smaller gaps from the radiolucent bonding layer was difficult with 3D μCT. Finally, a clinical imaging example using a newly developed dental SS-OCT system with an intra-oral scanning probe (Panasonic Healthcare, Japan) is presented. SS-OCT is a unique tool for clinical assessment and laboratory research on resin-based dental restorations. Supported by GCOE at TMDU and NCGG.

Paper Details

Date Published: 17 February 2011
PDF: 10 pages
Proc. SPIE 7884, Lasers in Dentistry XVII, 78840C (17 February 2011); doi: 10.1117/12.877351
Show Author Affiliations
Alireza Sadr, Tokyo Medical and Dental Univ. (Japan)
Yasushi Shimada, Tokyo Medical and Dental Univ. (Japan)
Juan Ricardo Mayoral, Univ. Internacional de Catalunya (Spain)
Ilnaz Hariri, Tokyo Medical and Dental Univ. (Japan)
Turki A. Bakhsh, Tokyo Medical and Dental Univ. (Japan)
Yasunori Sumi, National Ctr. for Geriatrics and Gerontology (Japan)
Junji Tagami, Tokyo Medical and Dental Univ. (Japan)

Published in SPIE Proceedings Vol. 7884:
Lasers in Dentistry XVII
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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