Longitudinal assessment of subsurface artificial root caries lesions by optical coherence tomography in comparison with transverse microradiography

Alireza Sadr; Syozi Nakashima; Yasushi Shimada; Junji Tagami; Yasunori Sumi

doi:10.1117/12.910707

30 January 2012 Longitudinal assessment of subsurface artificial root caries lesions by optical coherence tomography in comparison with transverse microradiography

Alireza Sadr, Syozi Nakashima, Yasushi Shimada, Junji Tagami, Yasunori Sumi

Author Affiliations +

Proceedings Volume 8208, Lasers in Dentistry XVIII; 82080H (2012) https://doi.org/10.1117/12.910707
Event: SPIE BiOS, 2012, San Francisco, California, United States

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 (R_S and R_D, respectively) were calculated. There was a significant positive relationship between ΔZ and R_D; but not between ΔZ and ΔR, where ΔR=R_D-R_S. 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.

Citation Download Citation

Alireza Sadr, Syozi Nakashima, Yasushi Shimada, Junji Tagami, and Yasunori Sumi "Longitudinal assessment of subsurface artificial root caries lesions by optical coherence tomography in comparison with transverse microradiography", Proc. SPIE 8208, Lasers in Dentistry XVIII, 82080H (30 January 2012); https://doi.org/10.1117/12.910707

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available