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論文 |
論文
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山田, 啓司 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎 ; 堀居, 直幸 ; Yamada, Keiji ; Ueda, Takashi ; Hosokawa, Akira ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />レーザを用いた歯科治療における窩洞形成時の熱損傷を監視する装置を開発し,その有効性について検証している.装置は,光ファイバ,分光器およびイメージセンサーから成っており,レーザ照射時に発生するプルーム光
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を観測している.硬組織に熱損傷が生じる際には,波長560nmの強い輝線スペクトルが観測され,損傷なく窩洞が形成される場合には,輝線スペクトルは観測されない.<br />出版者照会後に全文公開
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| 2.
論文 |
論文
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山田, 啓司 ; 森田, 精一 ; 上田, 隆司 ; 細川, 晃 ; 田中, 隆太郎
概要:
In this paper, a refrigerating chuck system is developed to reduce the thermal damages of workpiece in laser cleaving process. The system reduces the surface temperature of table below the freezing point of water, and the work material is
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fixed on the table by the frozen water between the material and the table. The cooling capability of the system is investigated. The system is applied to the laser cleaving process of silicon wafer with cw-Nd:YAG laser. The laser cleaving experiment of silicon wafer is conducted with Nd:YAG laser, then the width of thermal affected zone on the irradiated surface, the roughness of fractured surface and the deviation of cleaving trajectory are measured. The silicon oxide is caused on the surface of wafer in the room temperature, but the refrigerating chuck can prevent the thermal damage and improve the reliability of the cleaving process. By use of the chuck, the smooth fractured surface is achieved and the linearity of the cleaving trajectory is also improved.
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| 3.
論文 |
論文
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山田, 啓司 ; 上田, 隆司 ; 堀居, 直幸 ; 細川, 晃 ; 田中, 隆太郎
概要:
Water spraying is usually used in the removal of hard dental tissue with laser for the clinical cavity preparation which is previous to the prosthesis. However, the effect of water on the dental tissue irradiated with laser has not
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been evaluated quantitatively. In this paper, the cavity preparation is performed for human dentin tissue with Nd:YAG laser and Er:YAG laser to investigate the effects of water. The thermal damages caused on dentin tissue are microscopically observed and the perforatability is evaluated from the dimensions of cavity perforated. The thermal damages caused on dentin tissue is reduced by water, especially very fine cavity can be achieved in the cavity preparation with Er:YAG laser, while the perforatability with laser beam is decreased by water. The audible sound pressure level is also measured to investigate the feasibility of sound monitoring as the removal-monitoring method. It is found that the sound pressure level increases linearly with the extent of removed dental tissue.
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