Department of Cariology, Endodontology & Pedodontology, Academic Center for Dentistry Amsterdam, University of Amsterdam and VU University, Gustav Mahlerlaan 3004, 1081LA Amsterdam, The Netherlands.
Ultrason Sonochem. 2014 Jan;21(1):324-35. doi: 10.1016/j.ultsonch.2013.03.001. Epub 2013 Apr 2.
Ultrasonically Activated Irrigation makes use of an ultrasonically oscillating file in order to improve the cleaning of the root canal during a root canal treatment. Cavitation has been associated with these oscillating files, but the nature and characteristics of the cavitating bubbles were not yet fully elucidated. Using sensitive equipment, the sonoluminescence (SL) and sonochemiluminescence (SCL) around these files have been measured in this study, showing that cavitation occurs even at very low power settings. Luminol photography and high-speed visualizations provided information on the spatial and temporal distribution of the cavitation bubbles. A large bubble cloud was observed at the tip of the files, but this was found not to contribute to SCL. Rather, smaller, individual bubbles observed at antinodes of the oscillating file with a smaller amplitude were leading to SCL. Confinements of the size of bovine and human root canals increased the amount of SL and SCL. The root canal models also showed the occurrence of air entrainment, resulting in the generation of stable bubbles, and of droplets, near the air-liquid interface and leading eventually to a loss of the liquid.
超声激活冲洗利用超声震荡锉来提高根管治疗过程中根管的清洁度。空化作用与这些震荡锉有关，但空化泡的性质和特征尚未完全阐明。本研究使用灵敏的设备测量了这些锉周围的声致发光（SL）和声致化学发光（SCL），结果表明即使在很低的功率设置下也会发生空化。鲁米诺摄影和高速可视化提供了关于空化泡的时空分布的信息。在锉的尖端观察到了一个大的气泡云，但发现这并不是 SCL 的原因。相反，在振幅较小的震荡锉的节点处观察到的较小的单个气泡是导致 SCL 的原因。牛和人根管的尺寸限制增加了 SL 和 SCL 的量。根管模型还显示了空气夹带的发生，导致稳定气泡的产生，以及在气液界面附近产生液滴，并最终导致液体的损失。
