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Journal of Biomedical Optics

Near-ultraviolet removal rates for subgingival dental calculus at different irradiation angles
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Paper Abstract

The laser ablation rate of subgingival dental calculus irradiated at a 400-nm-wavelength, 7.4-mJ pulse energy, and 85- and 20-deg irradiation angles is measured using laser triangulation. Three-dimensional images taken before and after irradiation create a removal map with 6-μm axial resolution. Fifteen human teeth with subgingival calculus are irradiated in vitro under a cooling water spray with an ∼300-μm-diam, tenth-order super-Gaussian beam. The average subgingival calculus removal rates for irradiation at 85 and 20 deg are 11.1±3.6 and 11.5±5.9 μm/pulse, respectively, for depth removal and 4.5±1.7×105 and 4.8±2.3×105 μm3/pulse, respectively, for volume removal. The ablation rate is constant at each irradiation site but varies between sites because of the large differences in the physical and optical properties of calculus. Comparison of the average depth- and volume-removal rates does not reveal any dependence on the irradiation angle and is likely due to the surface topology of subgingival calculus samples that overshadows any expected angular dependence.

Paper Details

Date Published: 1 July 2011
PDF: 8 pages
J. Biomed. Opt. 16(7) 071404 doi: 10.1117/1.3564907
Published in: Journal of Biomedical Optics Volume 16, Issue 7
Show Author Affiliations
Joshua E. Schoenly, Univ. of Rochester (United States)
Wolf D. Seka, Univ. of Rochester (United States)
Peter Rechmann, Univ. of California, San Francisco (United States)

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