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Journal of Biomedical Optics • Open Access

Estimation of lesion progress in artificial root caries by swept source optical coherence tomography in comparison to transverse microradiography
Author(s): Yuko Natsume; Syozi Nakashima; Yasushi Shimada; Alireza Sadr; Junji Tagami; Yasunori Sumi

Paper Abstract

This study aimed to investigate whether swept source optical coherence tomography (SS-OCT) could estimate the lesion depth and mineral loss quantitatively without the use of polarization sensitivity, and to examine a relationship between OCT data and transverse microradiography (TMR) lesion parameters. Twenty-four bovine root dentin specimens were allocated to three groups of 4-, 7-, and 14-day demineralization. Cross-sectional images of the specimens before and after the demineralization were captured by OCT at 1319 nm center wavelength. Following the demineralization, these specimens were cut into sections for TMR analysis. Correlations between the OCT data and TMR lesion parameters were examined. TMR images of the specimens showed cavitated lesions (lesion depth or LDTMR: 200 to 500 μm, ΔZ or mineral loss: 10,000 to 30,000 vol % μm). The OCT images showed "boundaries," suggesting the lesion front. Integrated dB values before and after the demineralization and their difference (RD, RS, and ΔR, respectively) were calculated from the lesion surface to the corrected depth of boundary (LDOCT). A statistically significant correlation was found between LDOCT and LDTMR (p < 0.05, r = 0.68). Similarly, statistically significant correlations were found between ΔZ and RD or ΔR. The OCT showed a potential for quantitative estimation of lesion depth and mineral loss with cavitated dentin lesions in vitro.

Paper Details

Date Published: 1 July 2011
PDF: 9 pages
J. Biomed. Opt. 16(7) 071408 doi: 10.1117/1.3600448
Published in: Journal of Biomedical Optics Volume 16, Issue 7
Show Author Affiliations
Yuko Natsume, Tokyo Medical and Dental Univ. (Japan)
Syozi Nakashima, Tokyo Medical and Dental Univ. (Japan)
Yasushi Shimada, Tokyo Medical and Dental Univ. (Japan)
Alireza Sadr, Tokyo Medical and Dental Univ. (Japan)
Junji Tagami, Tokyo Medical and Dental Univ. (Japan)
Yasunori Sumi, National Ctr. for Geriatrics and Gerontology (Japan)


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