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Proceedings Paper

Selective near-UV ablation of subgingival dental calculus: measurement of removal rates
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Paper Abstract

A noncontact profilometer (laser triangulation) was used to measure the removal rates of subgingival dental calculus irradiated with a frequency-doubled Ti:sapphire laser (60-ns pulse duration, 400-nm wavelength, 10-Hz repetition rate, 7-mJ pulse energy). Profilometer traces before and after irradiation were used to create a removal map with 4-μm axial and 15-μm transverse resolution. Twenty-three teeth (15 with calculus and 8 pristine) were irradiated at 90° and 45° under a cooling water spray with a super-Gaussian beam (~300-μm diameter). Subgingival calculus was selectively removed at 5.6 and 4.0 J/cm2 for 90° and 45°, respecetively, within a range of rates, between 2 to 9 μm/pulse. These ablation rates were constant during these exposures. For comparison, pristine cementum irradiated for 10 min at the same peak fluence and pulse repetition rate showed only craters, 15 to 50 μm deep, corresponding to an equivalent removal rate three orders of magnitude smaller than that obtained for calculus. Pristine enamel was not removed under the same irradiation conditions.

Paper Details

Date Published: 6 March 2010
PDF: 10 pages
Proc. SPIE 7549, Lasers in Dentistry XVI, 754906 (6 March 2010); doi: 10.1117/12.849336
Show Author Affiliations
J. E. Schoenly, Lab. for Laser Energetics, Univ. of Rochester (United States)
The Institute of Optics, Univ. of Rochester (United States)
W. Seka, Lab. for Laser Energetics, Univ. of Rochester (United States)
The Institute of Optics, Univ. of Rochester (United States)
P. Rechmann, School of Dentistry, Univ. of California, San Francisco (United States)


Published in SPIE Proceedings Vol. 7549:
Lasers in Dentistry XVI
Peter Rechmann; Daniel Fried, Editor(s)

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