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Proceedings Paper

Use of a compact fiber optic spectrometer for spectral feedback during the laser ablation of dental hard tissues and restorative materials
Author(s): Joyce Yi-tzy Cheng; Kenneth Fan; Daniel Fried
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Paper Abstract

One perceived disadvantage of caries removal using lasers is the loss of the tactile feedback associated with the handpiece. However, alternative methods of acoustic and optical feedback become available with the laser that can be exploited to provide information about the chemical composition of the material ablated, the ablation efficiency and rate, the depth of the incision, and the surface and plume temperature during ablation. Such information can be used to increase the selectivity of ablation, avoid peripheral thermal damage and excessive heat deposition in the tooth, and provide a mechanism of robotic automation. The objective of this study was to test the hypothesis that a compact fiberoptic spectrometer could be used to differentiate between the ablation of sound and carious enamel and dentin and between dental hard tissues and composite. Sound and carious tooth surfaces along with composite restorative materials were scanned with λ=0.355, 2.79 and 9.3 μm laser pulses at irradiation intensities ranging from 0.5-100 J/cm2 and spectra were acquired from λ=250-900-nm using a compact fiber-optic spectrometer. Emission spectra varied markedly with the laser wavelength and pulse duration. Optical feedback was not successful in differentiating between sound and carious enamel and dentin even with the addition of various chromophores to carious lesion areas. However, the spectral feedback was successfully used to differentiate between composites and sound enamel and dentin enabling the selective removal of composite from tooth surfaces using a computer controlled λ=9.3-μm pulsed CO2 laser and scanning system.

Paper Details

Date Published: 13 February 2006
PDF: 7 pages
Proc. SPIE 6137, Lasers in Dentistry XII, 61370F (13 February 2006); doi: 10.1117/12.661789
Show Author Affiliations
Joyce Yi-tzy Cheng, Univ. of California/San Francisco (United States)
Kenneth Fan, Univ. of California/San Francisco (United States)
Daniel Fried, Univ. of California/San Francisco (United States)

Published in SPIE Proceedings Vol. 6137:
Lasers in Dentistry XII
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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