[in Japanese]

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Last year, the committee of the Clinical Training Program in the Japanese Society for Laser Dentistry held the first educational seminar for safety management in clinical laser dentistry at the 20th Annual Meeting of Japanese Society of Laser Dentistry.
The purpose of this questionnaire study was to investigate the current status of dental laser applications as well as safety management in clinics. The data was taken from 54 people including 39 dentists, 9 dental hygienists, and 14 other professional who attended the seminar.
The participants of the seminar showed high satisfaction in the contents of the seminar and expressed that they would like to participate in future seminars. Sixty-nine percent of the dentists frequently used lasers in their clinic, and 64% checked the lasers before usage and 85% used lasers approved by the Ministry of Health, Labour and Welfare.
The types of lasers used were the CO₂ (27%), Er:YAG (Er,Cr:YSSG) (24%), Diode (21%), Nd:YAG (19%), and the low-level laser (9%).
The laser was applied to treat stomatitis, soft tissue disease, hypersensitivity, periodontal pocket, dental caries and others.
These results suggested a need to hold this kind of seminar periodically.

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The purpose of this study was to evaluate the transmission of a diode laser through the dentin. Ten dentin disks of 1 mm in thickness were obtained from five extracted human molars. The surfaces of five disks were parallel to the long axis of the tooth, and the other five were perpendicular. The transmission of a diode laser through the dentin discs was measured by a power meter.
The laser transmission ratio varied between 0.049 and 0.216. The laser transmission was affected by the orientation of the dentinal tubules of the dentin disks.

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