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Proceedings Paper

Longitudinal assessment of subsurface artificial root caries lesions by optical coherence tomography in comparison with transverse microradiography
Author(s): Alireza Sadr; Syozi Nakashima; Yasushi Shimada; Junji Tagami; Yasunori Sumi
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Paper Abstract

We previously demonstrated that a swept-source optical coherence tomography system (SS-OCT) without polarization-sensing could quantitatively estimate the progress of cavitated dentin lesions in vitro. The purpose of the current study was to investigate the ability to estimate the lesion development in non-cavitated dentin lesions with a surface layer. Bovine root dentin specimens were subjected to different periods of demineralization (1 to 14 days). Cross-sectional images of the specimens before and after the demineralization were captured by SS-OCT at 1310 nm center wavelength. Following each period, the specimens were cut into sections for transverse microradiography (TMR) and correlations between SS-OCT data and TMR parameters were examined. TMR images of the specimens showed subsurface lesions ranging 100 to 400 μm in lesion depth (LD) and 1,000-5,000 volume in mineral loss (ΔZ). SS-OCT images showed a boundary suggesting the lesion front. Reflectivity increased with demineralization progress. A strong correlation was found between the boundary depth from the lesion surface and LD. Integrated dB values from the lesion surface to the boundary depth before and after the demineralization (RS and RD, respectively) were calculated. There was a significant positive relationship between ΔZ and RD; but not between ΔZ and ΔR, where ΔR=RD-RS. A clear indication of surface layer thickness was not found on OCT images. In conclusion, SS-OCT system could provide quantitative estimation of caries progress in artificial subsurface dentin lesion in terms of lesion depth. Further studies are needed to investigate whether other parameters of the dentin lesion with surface layer could be determined by this technique. Study supported by Global Center of Excellence at TMDU and NCGG.

Paper Details

Date Published: 30 January 2012
PDF: 7 pages
Proc. SPIE 8208, Lasers in Dentistry XVIII, 82080H (30 January 2012); doi: 10.1117/12.910707
Show Author Affiliations
Alireza Sadr, Tokyo Medical and Dental Univ. (Japan)
Syozi Nakashima, Tokyo Medical and Dental Univ. (Japan)
Yasushi Shimada, Tokyo Medical and Dental Univ. (Japan)
Junji Tagami, Tokyo Medical and Dental Univ. (Japan)
Yasunori Sumi, National Ctr. for Geriatrics and Gerontology (Japan)

Published in SPIE Proceedings Vol. 8208:
Lasers in Dentistry XVIII
Peter Rechmann; Daniel Fried, Editor(s)

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