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Analysis of dental caries using laser fluorescence and wavelength sensitive imaging

It is well known that fluorescence emission is produced when human dental enamel is irradiated with short-wavelength optical radiation. A limitation to wide acceptance of laser scanning is the scan acquisition time -- often over thirty minutes. This paper discusses a new approach to laser scanning that overcomes the above limitation while preserving the precision of micro-scanning. A surface of a tooth is flooded with laser light and an image of the fluorescence signal is acquired through a narrow wavelength window, typically 10 nm. An electronic optical filter selects the optical window and presents it to a CCD array. Under computer control, images at specific wavelengths can be obtained. By selecting regions which are most sensitive to fluorescence, the optical properties of a tooth surface can be rapidly determined. In the research version, a scanning laser fluorometer, co-aligned with the imaging system, allows precision fluorescence measurements of small regions identified by the imaging system.