3 December 1996 Effect of free electron laser (FEL) irradiation on tooth dentine
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Free electron laser (FEL) gives high efficiency for the photo-induced effects when the laser is tuned to the absorption maximum of target materials. The effect on dentine was investigated using the FEL tuned to 9.4 micrometers , which is an absorption maximum of phosphoric acid in infrared region. As a result, irradiated dentine surface which was amorphous had changed to the recrystalized structure by the spectroscopic analysis of IR absorption and x-ray diffraction. Furthermore, the atomic ratio of P/Ca had reduced from 0.65 to 0.60. These results indicated that 9.4micrometers -FEL irradiation caused the selective ablation of phosphoric acid ion and the reconstruction of disordered atoms.
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Seiji Ogino, Seiji Ogino, Kunio Awazu, Kunio Awazu, Takio Tomimasu, Takio Tomimasu, } "Effect of free electron laser (FEL) irradiation on tooth dentine", Proc. SPIE 2922, Laser Applications in Medicine and Dentistry, (3 December 1996); doi: 10.1117/12.260681; https://doi.org/10.1117/12.260681

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