Vyas Nina, Pecheva Emilia, Dehghani Hamid, Sammons Rachel L, Wang Qianxi X, Leppinen David M, Walmsley A Damien
Physical Sciences of Imaging for Biomedical Sciences (PSIBS) Doctoral Training Centre, College of Engineering & Physical Sciences, University of Birmingham, Birmingham, B15 2TT, United Kingdom.
School of Dentistry, College of Medical and Dental Sciences, University of Birmingham, St Chad's Queensway, Birmingham, B4 6NN, United Kingdom.
PLoS One. 2016 Mar 2;11(3):e0149804. doi: 10.1371/journal.pone.0149804. eCollection 2016.
Cavitation occurs around dental ultrasonic scalers, which are used clinically for removing dental biofilm and calculus. However it is not known if this contributes to the cleaning process. Characterisation of the cavitation around ultrasonic scalers will assist in assessing its contribution and in developing new clinical devices for removing biofilm with cavitation. The aim is to use high speed camera imaging to quantify cavitation patterns around an ultrasonic scaler. A Satelec ultrasonic scaler operating at 29 kHz with three different shaped tips has been studied at medium and high operating power using high speed imaging at 15,000, 90,000 and 250,000 frames per second. The tip displacement has been recorded using scanning laser vibrometry. Cavitation occurs at the free end of the tip and increases with power while the area and width of the cavitation cloud varies for different shaped tips. The cavitation starts at the antinodes, with little or no cavitation at the node. High speed image sequences combined with scanning laser vibrometry show individual microbubbles imploding and bubble clouds lifting and moving away from the ultrasonic scaler tip, with larger tip displacement causing more cavitation.
在牙科超声洁牙器周围会发生空化现象，牙科超声洁牙器在临床上用于去除牙菌斑和牙结石。然而，目前尚不清楚这是否有助于清洁过程。对超声洁牙器周围空化现象的表征将有助于评估其作用，并有助于开发利用空化作用去除牙菌斑的新型临床设备。目的是使用高速摄像机成像来量化超声洁牙器周围的空化模式。使用每秒15000帧、90000帧和250000帧的高速成像技术，对一台工作频率为29kHz、带有三种不同形状尖端的Satelec超声洁牙器在中高工作功率下进行了研究。使用扫描激光测振仪记录了尖端位移。空化现象发生在尖端的自由端，并随功率增加而增加，而空化云的面积和宽度因尖端形状不同而有所变化。空化现象始于波腹，波节处几乎没有空化现象。高速图像序列与扫描激光测振仪相结合，显示出单个微泡内爆以及气泡云从超声洁牙器尖端升起并移开，较大的尖端位移会导致更多的空化现象。
