Ahmad M, Pitt Ford T R, Crum L A, Wilson R F
Department of Conservative Dentistry, University of Malaya, Kuala Lumpur.
Oral Surg Oral Med Oral Pathol. 1990 Sep;70(3):328-32. doi: 10.1016/0030-4220(90)90150-q.
The physical mechanisms of ultrasound, namely cavitation and acoustic streaming, generated by the Enac-Osada ultrasonic unit were investigated for effectiveness in disrupting Streptococcus mitis. In addition, the bactericidal effect of ultrasound in the presence of 2.5% sodium hypochlorite was examined. Bacterial suspensions were irradiated directly with ultrasound in simulated root canals, and the viability of bacteria was examined after growth on a blood agar medium under anaerobic conditions at 37 degrees C for 5 days. The results indicated that ultrasound per se failed to disrupt bacteria but resulted in increases in the viable counts; the former was considered to be because of the lack of cavitation and the latter because of the dispersal effects of acoustic streaming. The 2.5% sodium hypochlorite solution demonstrated powerful bactericidal activity.
研究了Enac-Osada超声装置产生的超声物理机制，即空化和声学流，对破坏缓症链球菌的有效性。此外，还检测了在2.5%次氯酸钠存在下超声的杀菌效果。在模拟根管中直接用超声照射细菌悬液，在37℃厌氧条件下于血琼脂培养基上培养5天后检测细菌的生存能力。结果表明，超声本身未能破坏细菌，但导致活菌数增加；前者被认为是由于缺乏空化作用，后者是由于声学流的分散作用。2.5%的次氯酸钠溶液显示出强大的杀菌活性。
