28 May 2004 The surface of root canal irradiated by Nd:YAG laser with TiO2
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The aim of this study was to determine the appropriateness of Nd:YAG laser irradiation for root canal preparation. Tooth crowns were removed from single-rooted human teeth and a quartz optical fiber (diameter 400 μm) was inserted into the root canal orifice towards the apical foramen. The length of the fiber within the root canal was measured, and the irradiating length determined. Root canals were then filled with 3% TiO2 emulsion solution (a photosensitizer) and irradiated using a pulsed Nd:YAG laser at 600 mJ/pulse (pulse frequency; 5 or 10 pps). During laser irradiation, the fiber was moved coronally from the apical region towards the canal orifice at a rate of 1 mm/s. Contact microradiographs (CMR) were taken before and after laser irradiation. Each root was then halved longitudinally, and the root canal surface observed by scanning electron microscopy (SEM). The CMR images of the tooth revealed that the root canal was slightly enlarged as a result of treatment. Carbonization of the root canal dentin was not seen, but a smear layer and melted dentin were observed by SEM. Nd:YAG laser irradiation using TiO2 emulsion solution appears to be a useful tool for root canal preparation.
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Arata Ebihara, Arata Ebihara, Tomoo Anjo, Tomoo Anjo, Atsushi Takeda, Atsushi Takeda, Hideaki Suda, Hideaki Suda, "The surface of root canal irradiated by Nd:YAG laser with TiO2", Proc. SPIE 5313, Lasers in Dentistry X, (28 May 2004); doi: 10.1117/12.528912; https://doi.org/10.1117/12.528912

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