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Proceedings Paper

Tissue alteration and thermal characteristics of excimer laser interaction with dentin
Author(s): Joseph Neev; Lih-Huei L. Liaw; Adam Stabholtz; Mahmoud Torabinejad; Jack T. Fujishige; Michael W. Berns
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Paper Abstract

The interaction of two short pulse excimer lasers with dentin has been evaluated using 193 nm radiation from a 15 ns ArF and 308 nm pulses from a 15 ns XeCl. Temperature changes of the ablated surfaces were monitored and correlated to scanning electron microscope studies. While surface temperatures during irradiation with the XeCl laser rose significantly higher than those due to exposure to the ArF pulses, heat penetration into the tooth was minimal in both systems and did not perturb the vicinity of the root canal. The dependence of the dentin thermal response on changes in the beam spot size was investigated as well. Surface temperatures were found to be linearly dependent on spot size in both lasers. Scanning electron microscopic observations of the ablated surface showed that although temperature changes at low pulse repetition rates and at low fluence were minimal in both lasers, localized melting of dentin was observed in both lasers. In the case of the XeCl laser, sufficient amount of melted dentin was generated to induce flow and partial sealing of existing cracks in the dentin structure. Only minimal amount of dentin melting was generated by the ArF laser, but a very thin (approximately equals 1 micrometers ) coating of exposed tubules was observed at lower fluences. Surface morphology was found to depend strongly on the fluence levels used but was relatively insensitive to the laser pulse repetition rates.

Paper Details

Date Published: 1 June 1992
PDF: 12 pages
Proc. SPIE 1643, Laser Surgery: Advanced Characterization, Therapeutics, and Systems III, (1 June 1992); doi: 10.1117/12.137370
Show Author Affiliations
Joseph Neev, Beckman Laser Institute and Medical Clinic (United States)
Lih-Huei L. Liaw, Beckman Laser Institute and Medical Clinic (United States)
Adam Stabholtz, Loma Linda Univ. (United States)
Mahmoud Torabinejad, Loma Linda Univ. (United States)
Jack T. Fujishige, Beckman Laser Institute and Medical Clinic (United States)
Michael W. Berns, Beckman Laser Institute and Medical Clinic (United States)


Published in SPIE Proceedings Vol. 1643:
Laser Surgery: Advanced Characterization, Therapeutics, and Systems III
R. Rox Anderson, Editor(s)

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