This is the first study of dentin-enamel zone (DEZ) identification with tooth structure characterization based on the optical Stokes-Mueller measurement. Stokes vectors of a cross-sectional tooth slice were measured using various polarization inputs. The direction of the DEZ is different in enamel and dentin structures; therefore, the Stokes profiles can specifically characterize the structures based on the DEZ. This optical method, using polarimetry, provides a useful tool for characterizing tooth.
We characterized and imaged dental calculus using swept-source optical coherence tomography (SS-OCT). The refractive indices of enamel, dentin, cementum, and calculus were measured as 1.625 ± 0.024, 1.534 ± 0.029, 1.570 ± 0.021, and 2.097 ± 0.094, respectively. Dental calculus leads strong scattering properties, and thus, the region can be identified from enamel with SS-OCT imaging. An extracted human tooth with calculus is covered with gingiva tissue as an in vitro sample for tomographic imaging.
In this study, the dental calculus was characterized and imaged by means of swept-source optical coherence
tomography (SSOCT). The refractive indices of enamel, dentin, cementum and calculus were measured as 1.625±0.024,
1.534±0.029, 1.570±0.021 and 1.896±0.085, respectively. The dental calculus lead strong scattering property and thus
the region can be identified under enamel with SSOCT imaging. An extracted human tooth with calculus was covered by
gingiva tissue as in vitro sample for SSOCT imaging.
Diffuse optical spectroscopic imaging (DOSI) is a technique to assess the spatial variation in absorption and scattering
properties of the biological tissues and provides the monitoring of changes in concentrations of oxy-hemoglobin and
deoxy-hemoglobin. In our preliminary study, the temporal tracings of hemodynamic oxygenation are measured with
DOSI and venous occlusion test (VOT) from normal subjects, patients with heart failure and patients with sepsis in
intensive care unit (ICU). In experiments, the obvious differences of hemodynamic signals can be observed among the
three groups. The physiological relevance of VOT hemodynamics with respect to diseases is also discussed in this paper.
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