8 March 2007 Near-infrared image-guided laser ablation of artificial caries lesions
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Proceedings Volume 6425, Lasers in Dentistry XIII; 64250T (2007) https://doi.org/10.1117/12.714786
Event: SPIE BiOS, 2007, San Jose, California, United States
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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
You-Chen Tao, Kenneth Fan, Daniel Fried, "Near-infrared image-guided laser ablation of artificial caries lesions", Proc. SPIE 6425, Lasers in Dentistry XIII, 64250T (8 March 2007); doi: 10.1117/12.714786; https://doi.org/10.1117/12.714786
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