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Processing of Ceramic Blocks Using Femtosecond Lasers
https://osaka-dent.repo.nii.ac.jp/records/162
https://osaka-dent.repo.nii.ac.jp/records/16211ab28c8-9be2-4e1c-8c78-1b35ccbf0160
| 名前 / ファイル | ライセンス | アクション |
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学位論文 (3.8 MB)
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論文内容要旨・審査結果要旨 (209.9 kB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||||||
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| 公開日 | 2017-04-19 | |||||||||||
| 本文言語 | ||||||||||||
| 言語 | eng | |||||||||||
| タイトル | ||||||||||||
| タイトル | Processing of Ceramic Blocks Using Femtosecond Lasers | |||||||||||
| 著者 |
北尾, 徳嗣
× 北尾, 徳嗣
× Kitao, Noritsugu
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| キーワード | ||||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | Femtosecond laser ｜ Ceramic ｜Zirconia ｜ Processing | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||||||
| 資源タイプ | doctoral thesis | |||||||||||
| アクセス権 | ||||||||||||
| アクセス権 | open access | |||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||||
| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | We investigated the processing of ceramic blocks using a femtosecond Ti:sapphire laser. The materials used were completely-sintered zirconia, semi-sintered zirconia, alumina, and hydroxyapatite. The conditions varied were the wavelength, intensity, and defocus distance of the laser beam, the movement speed of the automatic stage, the use of an air flow for removing debris, and whether the samples had been soaked in water prior to laser processing. The effect of these settings on the depth and sectional area of the cut trace produced by laser irradiation was examined. The results indicated that the cutting force increased with increasing penetration of water to the interior of the material. Blackening of the zirconia was observed, but this disappeared upon reheating. The cutting force was found to depend on the laser intensity irradiating the sample. The depth and sectional area of the cut increased sharply with irradiation power up to about 20 mW, and then more gradually. For the same irradiation power, the cutting amount was larger for a shorter wavelength and pulse width. Cutting proceeded more effectively when the debris were removed during the process. The surface roughness at the floor of the formed cavity was at a clinically applicable level. These results suggest that a femtosecond Ti:sapphire laser can be used for high-precision processing of dental ceramics. |
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| 学位名 | ||||||||||||
| 学位名 | 博士（歯学） | |||||||||||
| 学位授与機関 | ||||||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||||||
| 学位授与機関識別子 | 34408 | |||||||||||
| 学位授与機関名 | 大阪歯科大学 | |||||||||||
| 学位授与年月日 | ||||||||||||
| 学位授与年月日 | 2017-03-10 | |||||||||||
| 学位授与番号 | ||||||||||||
| 学位授与番号 | 甲第804号 | |||||||||||
