The Effect of Free Erectron Laser (FEL) Irradiation on Dentine

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Broad tunability and the unique pulse structure provided by Free Electron Laser (FEL) technology provided new possibility for laser dentistry. Using the FEL tuned to phosphoric acid ion (9.4μm) which is an absorption maximum in infrared region on dentine, we investigate the irradiation effect on dentine.<BR>As a result, it was observed that irradiated dentine surface which was amorphous changed to the recrystalized structure. This result indicates that 9.4μm-FEL irradiation caused selective ablation of phosphoric acid ion and annealing.<BR>(J. Jpn. Soc. Laser Dent. 7: 67-71, 1996 Reprint requests to OGINO)
日本レーザー歯学会の論文