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

Joshua E. Schoenly; Wolf D. Seka; Peter Rechmann

doi:10.1117/1.3564907

1 July 2011 Near-ultraviolet removal rates for subgingival dental calculus at different irradiation angles

Joshua E. Schoenly, Wolf D. Seka, Peter Rechmann

Author Affiliations +

Funded by: U.S. Department of Energy Office of Inertial Confinement Fusion

Journal of Biomedical Optics, Vol. 16, Issue 7, 071404 (July 2011). https://doi.org/10.1117/1.3564907

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.

©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Joshua E. Schoenly, Wolf D. Seka, and Peter Rechmann "Near-ultraviolet removal rates for subgingival dental calculus at different irradiation angles," Journal of Biomedical Optics 16(7), 071404 (1 July 2011). https://doi.org/10.1117/1.3564907

Published: 1 July 2011

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KEYWORDS

Calculus

Teeth

Laser ablation

Microscopes

Near ultraviolet

Laser dentistry

Tissue optics

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