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摘要: 采用计算流体力学方法研究在真实人体牙根管的清洗过程中的根管内部流场特性,针对重建后的真实人体根管模型和 30 g 平头针,评估了冲洗液不同冲洗流速和针头不同工作深度对根管内流动形态、速度、壁面剪切应力和顶端压力的影响。结果表明：在真实人体根管中,持续增加冲洗液流速并不能对冲洗效果产生显著的提升效果,却会大幅提高顶端压力提升造成的挤压风险。工作深度与冲洗置换能力不是线性关系,适当的工作深度不仅具有最好的冲洗液置换效果,而且能降低顶端平均压力;而过大的工作深度对根管冲洗效果有着负面影响。Abstract: The computational fluid dynamics is used to investigate the flow field inside the real root canal during the irrigation, to evaluate the irrigation efficiency, as well as the effects of the irrigating fluid velocity and the working length on the flow pattern, the velocity, the shear stress and the apical pressure of the irrigating fluid. The real human root canal model and a 30 g flat head needle are adopted in the numerical simulation. It is shown that increasing the inflow velocity can not significantly improve the irrigation efficiency, but the risk of the apical extrusion is increased greatly because of the increase of the apical pressure. The working length can not always improve the displacement ability. An appropriate working length can be adopted to obtain the best displacement, together with the low apical pressure. Excessive increase of the working length might decrease the displacement and the shear stress on the wall, with a reduced irrigation efficiency.
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Keywords:
- computational fluid dynamics /
- irrigation /
- real root canal /
- velocity /
- work length
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