Near-ultraviolet removal rates for subgingival dental calculus at different irradiation angles
| Autor: | W. Seka, Peter Rechmann, Joshua E. Schoenly |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Microscope
Materials science Optical Phenomena Ultraviolet Rays medicine.medical_treatment Biomedical Engineering Lasers Solid-State In Vitro Techniques law.invention Biomaterials Optics law medicine Calculus Humans Dental Calculus Irradiation Laser ablation Pulse (signal processing) business.industry Calculus (dental) medicine.disease Laser Ablation Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials stomatognathic diseases Laser Therapy business Gaussian beam |
| Zdroj: | Journal of biomedical optics. 16(7) |
| ISSN: | 1560-2281 |
| Popis: | 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 ±1.7×10 5 and 4.8 ±2.3×10 5 μm 3 /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. C 2011 |
| Databáze: | OpenAIRE |
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