Research Papers

Absolute transmitted light plethysmography for assessment of dental pulp vitality through quantification of pulp chamber hematocrit by a three-layer model

[+] Author Affiliations
Satoko Kakino, Yuzo Takagi

Tokyo Medical and Dental UniversitySection of Developmental Oral Health Science, School of Dentistry, Tokyo, Japan

Setsuo Takatani

Tokyo Medical and Dental University, Department of Artificial Organs, Institute of Biomaterials and Bioengineering, Tokyo, Japan

J. Biomed. Opt. 13(5), 054023 (September 11, 2008). doi:10.1117/1.2976112
History: Received August 03, 2007; Revised April 29, 2008; Accepted May 13, 2008; Published September 11, 2008
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After confirming that the gingival circulation had little effect on transmitted light plethysmography measurement in the upper central incisor in both in vivo experiments and numerical Monte Carlo simulation studies, a three-layer model comprising of a pulp chamber sandwiched between two dentin layers has been introduced to quantify the pulp chamber hematocrit (Hctp) from the measured optical density. Two-flux theory was utilized to derive a mathematical equation for transmitted intensity in terms of tooth dimensions, Hctp, and light-source wavelength. Each layer was assumed homogeneous so as to represent its optical properties by the bulk absorption and scattering constants. The mean error between the Hctp estimate based on the three-layer-model equation and the Hctp actual in the extracted model tooth was 0.00115 with standard deviation (SD) of 0.00733 at 522nm wavelength, while for 810nm+0.09157 and 0.02493. The Hctp estimate of the upper central incisor in 10 young volunteers at 522nm using the three-layer model ranged from 0.002 to 0.061 with the mean of 0.032. The Hctp change reflects blood volume shift in the pulp microcirculation to possibly indicate dental pulp vitality.

© 2008 Society of Photo-Optical Instrumentation Engineers

Topics

Teeth

Citation

Satoko Kakino ; Yuzo Takagi and Setsuo Takatani
"Absolute transmitted light plethysmography for assessment of dental pulp vitality through quantification of pulp chamber hematocrit by a three-layer model", J. Biomed. Opt. 13(5), 054023 (September 11, 2008). ; http://dx.doi.org/10.1117/1.2976112


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