Abstract
The effects of the irradiation with strong mid-infrared beam of FEL on teeth were studied by use of the mid-infrared free electron laser (MIR-FEL) of the IR FEL Research Center of the Tokyo University of Science, aiming to determine an effective and safe wavelength for fortifying tooth structure. Black discoloration was observed in the irradiated area for all specimens, but more clearly in the cases of softened dentin. SEM images showed an ablated cavity surrounded by dissolved apatite that resembled lava is formed. The irradiation experiment was done at the wavelengths of 8.8, 9.4 and 10.6 µm. The depth of the enamel cavity created the irradiation was found to be deeper depending on the wavelength in the order: 8.4, 10.6 and 9.5 µm. The 9.5 µm FEL beam selectively ablated enamel and dentin surfaces, even if it was softened. These results indicate that the 8.5 µm beam will cause only a mild damage to the enamel structure. Thus 8.5 µm FEL beam may be suitable for increasing the acid resistance of enamel, alongside the simultaneous application of fluoride.
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