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Proceedings Paper

Detection of CO2 laser effects on enamel using volumetric laser-induced fluorescence
Author(s): Joseph R. Barron; Kenneth L. Zakariasen; Barry E. Paton
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Paper Abstract

The literature indicates that human dental enamel altered by CO2 laser energy becomes less susceptible to the caries process. In addition, the reported levels of laser radiation required to facilitate this preventative effect do not produce a visible change on the enamel surface. Also, research indicates that laser-induced fluorescence may provide a modality for detecting and quantifying differences in dental enamel. This pilot study, utilizing 3D scanned laser-induced fluorescence images, was designed to determine if laser irradiated enamel could be distinguished from normal enamel. Five third molars were selected for this study (Bu surfaces). Two 1.0 mm2 areas were scanned on each tooth using a scanning laser fluorescence spectrophotometer. Each scan area consisted of 20 parallel scan lines, 1.0 mm in length, spaced 50 micrometers apart. Measurements were taken at 50 micrometers intervals for a total of 400 points/scan. The results were stored in a 2D matrix format. Nine windows were then irradiated with a CO2 laser (3 at 0.5 W, 1.5 W, 2.5 W for 0.15 sec.) and re-scanned. Three-dimensional contour images produced for each scan permitted the irradiated area to be readily identified and isolated. The non-irradiated matrix for each window (baseline) was subtracted from the corresponding irradiated matrix. The resultant image was then summed to produce a `fluorescence volume' representative of the increase in fluorescence due to the laser irradiation. We have observed a distinct fluorescence signature by the laser irradiated area. Results are presented on the correlation of laser power with fluorescence volume.

Paper Details

Date Published: 21 July 1993
PDF: 6 pages
Proc. SPIE 1880, Lasers in Orthopedic, Dental, and Veterinary Medicine II, (21 July 1993); doi: 10.1117/12.148327
Show Author Affiliations
Joseph R. Barron, Dalhousie Univ. (Canada) and Marquette Univ. (United States)
Kenneth L. Zakariasen, Dalhousie Univ. (Canada) and Marquette Univ. (United States)
Barry E. Paton, Dalhousie Univ. (Canada) and Marquette Univ. (United States)

Published in SPIE Proceedings Vol. 1880:
Lasers in Orthopedic, Dental, and Veterinary Medicine II
Dov Gal; Stephen J. O'Brien; C. T. Vangsness; Joel M. White; Harvey A. Wigdor, Editor(s)

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