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Midinfrared ablation of dentin with the Vanderbilt FEL

Publication ,  Journal Article
Harris, DM; Reinisch, L; Edwards, GS; Yessik, MJ; Ashrafi, S; Santos-Sacchi, J
Published in: Proceedings of SPIE - The International Society for Optical Engineering
January 1, 1996

Absorption spectra of 0.1 - 0.2 mm thick, dehydrated sections of human teeth were measured in the transmission mode with a Bruker FT-IR spectrometer from 2.5 - 20 μm. Absorption peaks for amide I, II and III, carbonate and phosphate were identified. Craters were ablated in dentin and enamel using a tunable FEL at 6.45 μm at various fluences. Pulse duration: 3 μs; spot size (Gaussian, FWHM): 300 μm; repetition rate: 10 Hz. Crater depth and width were measured from digitized optical images. Ablation rates were computed from crater depth and volume data. Selected specimens were examined with scanning electron microscopy to determine ablation surface characteristics. Depth of thermal damage and dentinal tubule morphology were estimated from SEM examination of fractures through ablation sites. Functions describing crater depth vs. number of pulses (quadratic function) were not the same as crater volume vs. number of pulses (linear function). Crater depth decreases with successive pulses, concurrently, the crater width increases. Thus, each pulse removes approximately a constant volume. Material was observed to flow through the dentinal tubules during and after ablation. Patent tubules on crater walls and floor were observed with SEM. Ablation rates in dentin were approximately 3× those in enamel at 6.45 μm. Ablation rates and surface characteristics varied across wavelengths from 5.8 to 8.0 μm.

Duke Scholars

Published In

Proceedings of SPIE - The International Society for Optical Engineering

DOI

ISSN

0277-786X

Publication Date

January 1, 1996

Volume

2672

Start / End Page

165 / 175
 

Citation

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Harris, D. M., Reinisch, L., Edwards, G. S., Yessik, M. J., Ashrafi, S., & Santos-Sacchi, J. (1996). Midinfrared ablation of dentin with the Vanderbilt FEL. Proceedings of SPIE - The International Society for Optical Engineering, 2672, 165–175. https://doi.org/10.1117/12.238765
Harris, D. M., L. Reinisch, G. S. Edwards, M. J. Yessik, S. Ashrafi, and J. Santos-Sacchi. “Midinfrared ablation of dentin with the Vanderbilt FEL.” Proceedings of SPIE - The International Society for Optical Engineering 2672 (January 1, 1996): 165–75. https://doi.org/10.1117/12.238765.
Harris DM, Reinisch L, Edwards GS, Yessik MJ, Ashrafi S, Santos-Sacchi J. Midinfrared ablation of dentin with the Vanderbilt FEL. Proceedings of SPIE - The International Society for Optical Engineering. 1996 Jan 1;2672:165–75.
Harris, D. M., et al. “Midinfrared ablation of dentin with the Vanderbilt FEL.” Proceedings of SPIE - The International Society for Optical Engineering, vol. 2672, Jan. 1996, pp. 165–75. Scopus, doi:10.1117/12.238765.
Harris DM, Reinisch L, Edwards GS, Yessik MJ, Ashrafi S, Santos-Sacchi J. Midinfrared ablation of dentin with the Vanderbilt FEL. Proceedings of SPIE - The International Society for Optical Engineering. 1996 Jan 1;2672:165–175.

Published In

Proceedings of SPIE - The International Society for Optical Engineering

DOI

ISSN

0277-786X

Publication Date

January 1, 1996

Volume

2672

Start / End Page

165 / 175