日本レーザー歯学会誌
Online ISSN : 2185-6702
Print ISSN : 0917-7450
ISSN-L : 0917-7450
学術論文
Er:YAGレーザーを用いた根管洗浄時に生じる根管内蒸気泡および根尖孔外に発生する圧力の挙動
—チップ形態および照射時間による影響—
高野 晃渡辺 聡八尾 香奈子佐竹 和久興地 隆史
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2020 年 30 巻 2 号 p. 57-62

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Objective: This study aimed to analyze the effect of tip configuration and length of irradiation time on intracanal vaporized bubble kinetics and apical pressure during laser-activated root canal irrigation(LAI) with Er:YAG laser.
Materials and methods: A plastic pipette tip was modified as a simulated root canal model(apical diameter 0.40 mm, 6% taper, 20 mm long). The canal model was filled with distilled water and LAI was performed using an Er:YAG laser unit(Erwin AdvErl, J. Morita, Kyoto) with a flat-ended tip(C600F) or a cone-shaped tip(R600T) at 70 mJ, 10 pps. The end of the laser tip was fixed at 15 mm from the root apex. Kinetics of vapor bubbles in the simulated root canal during the lasing were monitored with a high-speed camera, and the bubble count and velocity at 100, 500 and 1000 milliseconds were analyzed with video analysis software. The maximum pressure generated outside the apical foramen during 5 seconds of laser irradiation was measured with a pressure sensor connected to the apex of the root canal model.
Results: As for the vapor bubble count, there was no significant main effect of tip configuration(p>0.05), whereas the main effect of irradiation time was significant(p<0.05). The number of vapor bubbles showed a significant increase with increasing the irradiation time(p<0.05). Regarding the vapor bubble velocity, there was no significant main effect of either tip configuration or time(p>0.05). There was no significant difference between the two types of laser tips with regard to the apical pressure.
Conclusion: In LAI with an Er:YAG laser, the tip configuration did not affect the intracanal bubble count, velocity or apical pressure, whereas the increase of irradiation time significantly increased the bubble count.

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