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Kuwada-Kusunose T, Kusunose A, Wakami M, Takebayashi C, Goto H, Aida M, Sakai T, Nakao K, Nogami K, Inagaki M, Hayakawa K, Suzuki K, Sakae T. Evaluation of irradiation effects of near-infrared free-electron-laser of silver alloy for dental application. Lasers Med Sci 2017; 32:1349-1355. [PMID: 28616700 DOI: 10.1007/s10103-017-2251-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 06/04/2017] [Indexed: 11/28/2022]
Abstract
In the application of lasers in dentistry, there is a delicate balance between the benefits gained from laser treatment and the heat-related damage arising from laser irradiation. Hence, it is necessary to understand the different processes associated with the irradiation of lasers on dental materials. To obtain insight for the development of a safe and general-purpose laser for dentistry, the present study examines the physical effects associated with the irradiation of a near-infrared free-electron laser (FEL) on the surface of a commonly used silver dental alloy. The irradiation experiments using a 2900-nm FEL confirmed the formation of a pit in the dental alloy. The pit was formed with one macro-pulse of FEL irradiation, therefore, suggesting the possibility of efficient material processing with an FEL. Additionally, there was only a slight increase in the silver alloy temperature (less than 0.9 °C) despite the long duration of FEL irradiation, thus inferring that fixed prostheses in the oral cavity can be processed by FEL without thermal damage to the surrounding tissue. These results indicate that dental hard tissues and dental materials in the oral cavity can be safely and efficiently processed by the irradiation of a laser, which has the high repetition rate of a femtosecond laser pulse with a wavelength around 2900 nm.
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Affiliation(s)
- Takao Kuwada-Kusunose
- Department of Liberal Arts (Biology), Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan.
| | - Alisa Kusunose
- Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Masanobu Wakami
- Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Chikako Takebayashi
- Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Haruhiko Goto
- Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Masahiro Aida
- Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Takeshi Sakai
- Laboratory for Electron Beam Research and Application, Nihon University, 7-24-1, Narashinodai, Funabashi, Chiba, 274-8501, Japan
| | - Keisuke Nakao
- Laboratory for Electron Beam Research and Application, Nihon University, 7-24-1, Narashinodai, Funabashi, Chiba, 274-8501, Japan.,Cyber Defense Institute, Inc., Yaesu Center Building 4F, 1-6-6, Yaesu, Chuo-ku, Tokyo, 103-0028, Japan
| | - Kyoko Nogami
- Laboratory for Electron Beam Research and Application, Nihon University, 7-24-1, Narashinodai, Funabashi, Chiba, 274-8501, Japan
| | - Manabu Inagaki
- Laboratory for Electron Beam Research and Application, Nihon University, 7-24-1, Narashinodai, Funabashi, Chiba, 274-8501, Japan.,Euro Meditech Co., Ltd., Crystal Building 401, 1-15-7, Tenjinbashi, Kita-ku, Osaka, 530-0041, Japan
| | - Ken Hayakawa
- Laboratory for Electron Beam Research and Application, Nihon University, 7-24-1, Narashinodai, Funabashi, Chiba, 274-8501, Japan
| | - Kunihiro Suzuki
- Department of Liberal Arts (Biology), Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Toshiro Sakae
- Department of Histology, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
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