:Influences of Different Power at Laser Irradiation
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Many low-power laser apparatuses have been developed, and their efficiencies have been reported for treatment of dentinal hypersensitivity or temporomandibularis. In addition, several reports indicated the application of a low-power laser. The purpose of this study was to investigate the effect of low-power laser irradiation on bone remodeling using rat calvaria with an artificially formed defect. Artificial bone defects of 4 mm in diameter were prepared by a round bur with a low-speed dental engine.<BR>Ga-Al-As laser (830nm, 30mW, or 80mW) irradiation was applied to bone defects in right calvaria, as an experimental site, for 10 minutes once a day, and this procedure was carried out up to 1, 2, 3, 4, 5 or 6 weeks. Bone defects in left calvaria, without laser irradiation, were used as a non-irradiation site. Results obtained were as follows.<BR>New bone formation was enhanced with 30mW laser irradiation. Particularly, 4-week irradiation showed the highest amount of new bone formation, compared with the control groups.<BR>1. New bone formation was also enhanced with 80mW laser irradiation. Particularly, from 2-week to 4-week irradiation showed a significant difference between experimental groups, and control groups in the amount of new bone.<BR>2. Camparing 30mW and 80mW irradiation, 80mW groups showed more new bone formation than 30mW groups after 3-week laser irradiation. However, there was no significant difference between 30mW and 80mW groups after 4-week irradiation.<BR>(J. Jpn. Soc. Laser Dent. 12: 2-9, 2001 Reprint requests to Dr. MEZAWA)
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