Er:YAGレーザーの根管内照射による影響 : 歯根表面温度の変化について

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The condition of lasering must be carefully controlled so as not to damage the periodontal tissues during laser irradiation in a root canal. The aim of this study was to investigate the temperature rise on root surfaces of an extracted human tooth during and after intracanal irradiation by Erbium: Yttrium-Aluminum: Garnet (Er: YAG) laser. A single-rooted extracted tooth was used. After the crown was removed, the root canal was enlarged mechanically up to a size of # 60. Er: YAG laser was irradiated using a cone-shaped fiber tip without water spray or air cooling at different conditions: pulse energy (30, 50 and 70 mJ), pulse per second (20 pps and 10 pps), draw-up speed from an apical foramen (2mm/sec and 1mm/sec), and number of irradiation times (1 and 2 times). Temperature changes were recorded thermographically. Thickness of the root canal walls was measured using a 3DX multi-image micro CT after irradiation. The increase of the temperature on root surfaces was higher at the thin root canal wall area, and highest at the apical area. The temperature rose higher with the second irradiation than with the first irradiation. When irradiated at the same energy, the temperature increased higher under the condition of 20 pps and 2 mm/sec compared to that of 10 pps and 1mm/sec. The results showed that the temperature rise was less than 5℃ at the following laser settings and considered harmless to periodontal tissues: 1) irradiating 2 times of 30 mJ or 1 time of 50 mJ with 20 pps and 2 mm/sec, and 2) irradiating 2 times of 30 mJ or 50 mJ with 10 pps and 1 mm/sec.
特定非営利活動法人日本歯科保存学会の論文
2006-12-31

Er:YAGレーザーの根管内照射による影響 : 歯根表面温度の変化について

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