1 October 1996 Infrared radiometry of dental enamel during Er:YAG and Er:YSGG laser irradiation
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Time-resolved infrared (IR) radiometry was used to measure surface temperatures during pulsed Er:YSGG(l=2.79 mm) and Er:YAG (l=2.94 mm) laser irradiation of dental enamel. Scanning electron microscopy (SEM)was used to determine the melting and vaporization thresholds and to characterize other changes in thesurface morphology. The magnitude and temporal evolution of the surface temperature during multiplepulse irradiation of the tissue was dependent on the wavelength, fluence, and pre-exposure to laser pulses. Radiometry and SEM micrographs indicate that ablation is initiated at temperatures well below the melting and vaporization temperatures of the carbonated hydroxyapatite mineral component (1200 °C). Ablation occurred at lower surface temperatures and at lower fluences for Er:YAG than for Er:YSGG laser irradiation: 400 °C vs. 800 °C and above 7 J/cm2 vs. 18 J/cm2, respectively. However, the measured surface temperatures were higher at l=2.79 mm than at l=2.94 mm during low fluence irradiation (<7 J/cm2). Spatially dependent absorption in the enamel matrix is proposed to explain this apparent contradiction.
Daniel Fried, Steven R. Visuri, John D. B. Featherstone, Joseph T. Walsh, Wolf D. Seka, Richard E. Glena, Sandra M. McCormack, Harvey A. Wigdor, "Infrared radiometry of dental enamel during Er:YAG and Er:YSGG laser irradiation," Journal of Biomedical Optics 1(4), (1 October 1996). https://doi.org/10.1117/12.250668 . Submission:

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