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Proceedings Paper

Optical sensor based system to monitor caries activity
Author(s): A. Shrestha; R. Tahir; A. Kishen
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Paper Abstract

The aim of the study is to evaluate the ability of a visible light based spectroscopic sensor system to monitor caries activity in saliva. In this study an optical sensor is utilized to monitor the bacterial-mediated acidogenic profile of stimulated saliva using a photosensitive pH indicator. Microbiological assessment of the saliva samples were carried out using the conventional culture methods. In addition, the shifts in the pH of saliva-sucrose samples were recorded using a pH meter. The absorption spectra obtained from the optical sensor showed peak maxima at 595nm, which decreased as a function of time. The microbiological assessment showed increase in the bacterial count as a function of time. A strong positive correlation was also observed between the rates of decrease in the absorption intensity measured using the optical sensor and the decrease in pH measured using the pH meter. This study highlights the potential advantages of using the optical sensor as a sensitive and rapid chairside system for monitoring caries activity by quantification of the acidogenic profile of saliva.

Paper Details

Date Published: 13 July 2007
PDF: 6 pages
Proc. SPIE 6633, Biophotonics 2007: Optics in Life Science, 663317 (13 July 2007); doi: 10.1117/12.729438
Show Author Affiliations
A. Shrestha, National Univ. of Singapore (Singapore)
R. Tahir, National Univ. of Singapore (Singapore)
A. Kishen, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 6633:
Biophotonics 2007: Optics in Life Science
Jürgen Popp; Gert von Bally, Editor(s)

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