Swept source optical coherence tomography for quantitative and qualitative assessment of dental composite restorations

Alireza Sadr; Yasushi Shimada; Juan Ricardo Mayoral; Ilnaz Hariri; Turki A. Bakhsh; Yasunori Sumi; Junji Tagami

doi:10.1117/12.877351

17 February 2011 Swept source optical coherence tomography for quantitative and qualitative assessment of dental composite restorations

Alireza Sadr, Yasushi Shimada, Juan Ricardo Mayoral, Ilnaz Hariri, Turki A. Bakhsh, Yasunori Sumi, Junji Tagami

Author Affiliations +

Proceedings Volume 7884, Lasers in Dentistry XVII; 78840C (2011) https://doi.org/10.1117/12.877351
Event: SPIE BiOS, 2011, San Francisco, California, United States

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.

Citation Download Citation

Alireza Sadr, Yasushi Shimada, Juan Ricardo Mayoral, Ilnaz Hariri, Turki A. Bakhsh, Yasunori Sumi, and Junji Tagami "Swept source optical coherence tomography for quantitative and qualitative assessment of dental composite restorations", Proc. SPIE 7884, Lasers in Dentistry XVII, 78840C (17 February 2011); https://doi.org/10.1117/12.877351

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