Department of Endodontology, Dental School, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Int Endod J. 2010 May;43(5):393-403. doi: 10.1111/j.1365-2591.2010.01692.x.
To compare the results of a Computational Fluid Dynamics (CFD) simulation of the irrigant flow within a prepared root canal, during final irrigation with a syringe and a needle, with experimental high-speed visualizations and theoretical calculations of an identical geometry and to evaluate the effect of off-centre positioning of the needle inside the root canal.
A CFD model was created to simulate irrigant flow from a side-vented needle inside a prepared root canal. Calculations were carried out for four different positions of the needle inside a prepared root canal. An identical root canal model was made from poly-dimethyl-siloxane (PDMS). High-speed imaging of the flow seeded with particles and Particle Image Velocimetry (PIV) were combined to obtain the velocity field inside the root canal experimentally. Computational, theoretical and experimental results were compared to assess the validity of the computational model.
Comparison between CFD computations and experiments revealed good agreement in the velocity magnitude and vortex location and size. Small lateral displacements of the needle inside the canal had a limited effect on the flow field.
High-speed imaging experiments together with PIV of the flow inside a simulated root canal showed a good agreement with the CFD model, even though the flow was unsteady. Therefore, the CFD model is able to predict reliably the flow in similar domains.
比较在预备根管中使用注射器和针头进行最终冲洗时，计算流体动力学（CFD）模拟冲洗剂在预备根管内流动的结果与相同几何形状的高速可视化实验和理论计算的结果，并评估针头在根管内偏心定位的影响。
创建了一个 CFD 模型，以模拟侧孔针头在预备根管内的冲洗剂流动。针对针头在预备根管内的四个不同位置进行了计算。使用聚二甲基硅氧烷（PDMS）制作了相同的根管模型。使用高速摄像对颗粒示踪的流动进行了拍摄，并结合粒子图像测速（PIV）技术获得了根管内的速度场实验结果。通过比较计算、理论和实验结果来评估计算模型的有效性。
CFD 计算与实验之间的比较表明，在速度大小和涡旋位置和大小方面具有良好的一致性。针头在根管内的小横向位移对流动场的影响有限。
高速摄像实验与模拟根管内流动的 PIV 相结合，与 CFD 模型显示出良好的一致性，即使流动是不稳定的。因此，CFD 模型能够可靠地预测类似区域的流动。
