start-ver=1.4
cd-journal=joma
no-vol=56
cd-vols=
no-issue=1
article-no=
start-page=109
end-page=118
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=202011
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Evaluation of dental caries, tooth crack, and age-related changes in tooth structure using optical coherence tomography
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Optical coherence tomography (OCT) is an imaging technique that can visualize the internal biological structure without X-ray exposure. Swept-source OCT (SS-OCT) is one of the latest version of OCT, wherein the light source is a tunable laser that sweeps near-infrared wavelength light to achieve real-time imaging. The imaging depth of OCT is highly influenced by the translucency of the medium. The medium that does not transmit light and the deeper structure beyond the range of light penetration depth are not relevant for OCT imaging. In OCT, sound enamel is almost transparent at the OCT wavelength range, and enamel and dentin can be distinguished from each other as the dentin-enamel junction (DEJ) appears as a dark border. Demineralized enamel and dentin are imaged as bright zones because of the formation of numerous micro-porosities where the backscatter of OCT signal is increased. In cavitated caries at interproximal or occlusal hidden zone, the upper margin of the cavity reflects the signal showing a distinct bright border in the SS-OCT image. SS-OCT is capable of determining crack penetration depth even when the cracks extended beyond the DEJ. SS-OCT has a high degree of sensitivity and specificity for the detection of dental caries and tooth cracks. SS-OCT is also capable of detecting non-carious cervical lesions and occlusal tooth wear in cross-sectional views to estimate the amount of tooth structure loss.
en-copyright=
kn-copyright=

en-aut-name=ShimadaYasushi
en-aut-sei=Shimada
en-aut-mei=Yasushi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=YoshiyamaMasahiro
en-aut-sei=Yoshiyama
en-aut-mei=Masahiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=TagamiJunji
en-aut-sei=Tagami
en-aut-mei=Junji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=SumiYasunori
en-aut-sei=Sumi
en-aut-mei=Yasunori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Department of Operative Dentistry, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
kn-affil=

affil-num=2
en-affil=Department of Operative Dentistry, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
kn-affil=

affil-num=3
en-affil=Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
kn-affil=

affil-num=4
en-affil=Department for Advanced Dental Research, Center of Advanced Medicine for Dental and Oral Diseases, National Center for Geriatrics and Gerontology
kn-affil=
en-keyword=Optical coherence tomography
kn-keyword=Optical coherence tomography
en-keyword=Diagnosis
kn-keyword=Diagnosis
en-keyword=Caries
kn-keyword=Caries
en-keyword=Tooth crack
kn-keyword=Tooth crack
en-keyword=NCCL
kn-keyword=NCCL
en-keyword=Tooth wear
kn-keyword=Tooth wear
en-keyword=Age-related changes
kn-keyword=Age-related changes
END