：根管冲洗是根管治疗中的重要步骤，通过冲洗液的冲洗作用与消毒作用将根管内碎屑与感染物去除，对根管器械预备起到重要补充作用。根管冲洗从本质上来说，既是一个杀灭微生物的化学与生物学过程，也是一个以液体流动为主的物理学过程，研究表明根管冲洗的冲刷与流动的物理学作用是影响根管冲洗结果的重要因素，由于根管内部的流场无法直接观察，同时一些参数如速度，压力，壁面剪切应力也无法通过常规实验获得其分布特征，如能掌握根管冲洗的流体特征，将有效促进冲洗效率的提高。本课题拟利用水力学与计算流体动力学等技术，构建真实离体牙根管冲洗的流体动力及其仿真模拟模型，对影响根管冲洗效率与并发症的相关因素，如根管形状，推注速度，针头设计等因素进行分析，并对根管内生物膜的冲刷与脱落行为进行研究，诠释根管冲洗的内在流体流动的物理学本质，为合理选择根管冲洗技术提供理论基础和科学依据，对于提高根管治疗成功率具有重要的意义。

The root canal irrigation is an important step in root canal treatment, which play an important complementary role in mechanical preparation on removing the disinfection of debris and infectious agents through the flushing and disfecting effect of irrigating fluid. In essence, root canal irrigants, not only a chemical and biological processes of killing microorganisms, but also is a physics process of liquid flow-based, The studies shown that the root canal irrigation flush and the flow of root canal irrigants is an important factor affect the results and efficiency of root canal irriation. Due to the flow field of the internal root canal can not be directly observed, some parameters such as speed, pressure, wall shear stress can not be obtained by conventional experimental distribution characteristics. Grasp the characteristics of the root canal irrigation fluid will promote the irrigating efficiency. This project intends to use the hydraulics and computational fluid dynamics technology to build real root canal irrigation fluid simulation model, the influence of root canal flushing efficiency and complications related factors, such as root canal shape, bolus speed, needle design, analysis, and root canal within the biofilm washed off behavior, interpretation of the hydrodynamic nature of the internal root canal irrigants, provide a theoretical basis for a reasonable choice of root canal irrigation technology and the scientific basis for improving root canal treatment success.