School of Mathematics, College of Engineering and Physical Sciences, University of Birmingham, Birmingham, United Kingdom; Department of Mathematics, College of Science, Salahaddin University-Erbil, Kurdistan Region, Iraq.
College of Engineering, Peking University, Beijing 100871, China.
Ultrason Sonochem. 2020 May;63:104963. doi: 10.1016/j.ultsonch.2020.104963. Epub 2020 Jan 9.
Bacterial biofilm accumulation around dental implants is a significant problem leading to peri-implant diseases and implant failure. Cavitation occurring in the cooling water around ultrasonic scaler tips can be used as a novel solution to remove debris without any surface damage. However, current clinically available instruments provide insufficient cavitation around the activated tip surface. To solve this problem a critical understanding of the vibro-acoustic behaviour of the scaler tip and the associated cavitation dynamics is necessary. In this research, we carried out a numerical study for an ultrasound dental scaler with a curved shape tip vibrating in water, using ABAQUS based on the finite element method. We simulated the three-dimensional, nonlinear and transient interaction between the vibration and deformation of the scaler tip, the water flow around the scaler and the cavitation formation and dynamics. The numerical model was well validated with the experiments and there was excellent agreement for displacement at the free end of the scaler. A systematic parametric study has been carried out for the cavitation volume around the scaler tip in terms of the frequency, amplitude and power of the tip vibration. The numerical results indicate that the amount of cavitation around the scaler tip increases with the frequency and amplitude of the vibration. However, if the frequency is far from the natural frequency, the cavitation volume around the free end decreases due to reduced free end vibration amplitude.
细菌生物膜在种植牙周围的积累是导致种植体周围疾病和种植体失败的一个重大问题。在超声洁牙机探头周围的冷却水中产生的空化现象可以作为一种去除碎片而不造成任何表面损伤的新方法。然而，目前临床可用的仪器在激活探头表面周围提供的空化作用不足。为了解决这个问题，需要对洁牙机探头的振动声特性及其相关的空化动力学有一个关键的理解。在这项研究中，我们使用基于有限元法的 ABAQUS 对弯曲形状的超声牙科洁牙机的探头进行了数值研究。我们模拟了洁牙机探头的振动和变形、探头周围的水流以及空化形成和动力学之间的三维、非线性和瞬态相互作用。数值模型与实验进行了很好的验证，并且在洁牙机自由端的位移方面具有很好的一致性。针对探头振动的频率、振幅和功率，对探头周围的空化体积进行了系统的参数研究。数值结果表明，探头周围的空化量随着振动的频率和振幅的增加而增加。然而，如果频率远离固有频率，由于自由端振动幅度的减小，自由端周围的空化体积会减少。
