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Proceedings Paper

Near-infrared image-guided laser ablation of artificial caries lesions
Author(s): You-Chen Tao; Kenneth Fan; Daniel Fried
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Paper Abstract

Laser removal of dental hard tissue can be combined with optical, spectral or acoustic feedback systems to selectively ablate dental caries and restorative materials. Near-infrared (NIR) imaging has considerable potential for the optical discrimination of sound and demineralized tissue. The objective of this study was to test the hypothesis that two-dimensional NIR images of demineralized tooth surfaces can be used to guide CO2 laser ablation for the selective removal of artificial caries lesions. Highly patterned artificial lesions were produced by submerging 5 x 5 mm2 bovine enamel samples in demineralized solution for a 9-day period while sound areas were protected with acid resistant varnish. NIR imaging and polarization sensitive optical coherence tomography (PS-OCT) were used to acquire depth-resolved images at a wavelength of 1310-nm. An imaging processing module was developed to analyze the NIR images and to generate optical maps. The optical maps were used to control a CO2 laser for the selective removal of the lesions at a uniform depth. This experiment showed that the patterned artificial lesions were removed selectively using the optical maps with minimal damage to sound enamel areas. Post-ablation NIR and PS-OCT imaging confirmed that demineralized areas were removed while sound enamel was conserved. This study successfully demonstrated that near-IR imaging can be integrated with a CO2 laser ablation system for the selective removal of dental caries.

Paper Details

Date Published: 8 March 2007
PDF: 8 pages
Proc. SPIE 6425, Lasers in Dentistry XIII, 64250T (8 March 2007); doi: 10.1117/12.714786
Show Author Affiliations
You-Chen Tao, Univ. of California, San Francisco School of Dentistry (United States)
Kenneth Fan, Univ. of California, San Francisco School of Dentistry (United States)
Daniel Fried, Univ. of California, San Francisco School of Dentistry (United States)

Published in SPIE Proceedings Vol. 6425:
Lasers in Dentistry XIII
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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