Relationship between refractive index and mineral content of enamel and dentin using SS-OCT and TMR

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

doi:10.1117/12.908290

30 January 2012 Relationship between refractive index and mineral content of enamel and dentin using SS-OCT and TMR

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

Proceedings Volume 8208, Lasers in Dentistry XVIII; 82080M (2012) https://doi.org/10.1117/12.908290
Event: SPIE BiOS, 2012, San Francisco, California, United States

Abstract

The aim of this work was to investigate relationship between refractive index (n) and mineral content (MC) (vol %) of enamel and dentin using swept-source optical coherence tomography (SS-OCT) and transverse microradiography (TMR). Enamel and dentin blocks were partitioned into three regions. The middle partition of each sample was covered with a nail polish to protect the sound area during exposure to the treatment solutions. Samples were demineralized in a demineralizing solution, which was refreshed once a week, for 2 months. One window was covered with acid-resistant varnish, leaving the other window exposed; the samples were placed in a solution for remineralization. Samples then were sliced into disks with thickness of 300 μm to 400 μm and placed on metal plate in order to capture cross-sectional images of sound, demineralized and remineralized regions by OCT at 1319 nm center wavelength. The n then was calculated via formula using image analysis software. Following n measurement, these specimens were further polished for the TMR analysis. Correlation between OCT n and TMR MC was examined. A significant and highly positive correlation was found between the measured n and the actual MC at the corresponding locations (Pearson correlation coefficients (r) were 0.94 and 0.97 in enamel and 0.95 and 0.91 in dentin after de-/remineralization process, respectively p < 0.05). OCT showed a potential for quantitative analysis of the mineral loss or gain by measuring of the n in vitro. Supported by the grant from the Japanese Ministry of Education, Global Center of Excellence (GCOE) Program, "International Research Center for Molecular Science in Tooth and Bone Diseases."

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Ilnaz Hariri, Alireza Sadr, Yasushi Shimada, Syozi Nakashima, Yasunori Sumi, and Junji Tagami "Relationship between refractive index and mineral content of enamel and dentin using SS-OCT and TMR", Proc. SPIE 8208, Lasers in Dentistry XVIII, 82080M (30 January 2012); https://doi.org/10.1117/12.908290

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KEYWORDS

Optical coherence tomography

Minerals

Polishing

Refractive index

Teeth

Tissue optics

Metals

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