Gao Yuan, Haapasalo Markus, Shen Ya, Wu Hongkun, Li Bingdong, Ruse N Dorin, Zhou Xuedong
State Key Laboratory of Oral Diseases, West China College and Hospital of Stomatology, Sichuan University, Chengdu, China.
J Endod. 2009 Sep;35(9):1282-7. doi: 10.1016/j.joen.2009.06.018.
Root canal irrigation plays an important role in the debridement and disinfection of the root canal system and is an integral part of root canal preparation procedures. The aim was to construct a three-dimensional computational fluid dynamics (CFD) model of root canal irrigation, with a suitable turbulence model, and validate it to provide a novel method for studying the root canal irrigation.
A camcorder was used to record the effect of irrigation in the in vitro model. An exact replica of the geometry and the physical parameters of the in vitro irrigation model were used in CFD analysis, considering four turbulent models. The in vitro irrigation model was used as the reference for the evaluation of the CFD models.
The result showed that CFD analysis based on a shear stress transport (SST) k-omega turbulence model was in close agreement with the in vitro irrigation model. The in vitro and CFD analyses showed that the irrigant in the curved canal flushes only up to a limited distance beyond the tip of the needle. The results of the CFD analysis also showed that laminar flow exists in the needle lumen and transit the transitional and turbulent flow around the side-vent outlet of the needle and needle tip.
The results suggested that CFD based on a SST k-omega turbulence model has the potential to serve as a platform for the study of root canal irrigation.
根管冲洗在根管系统的清创和消毒中起着重要作用，是根管预备程序不可或缺的一部分。目的是构建一个带有合适湍流模型的根管冲洗三维计算流体动力学（CFD）模型，并对其进行验证，以提供一种研究根管冲洗的新方法。
使用摄像机记录体外模型中冲洗的效果。在CFD分析中使用体外冲洗模型的几何形状和物理参数的精确复制品，考虑四种湍流模型。体外冲洗模型用作评估CFD模型的参考。
结果表明，基于剪切应力输运（SST）k-ω湍流模型的CFD分析与体外冲洗模型密切吻合。体外和CFD分析表明，弯曲根管中的冲洗液仅在超出针尖有限距离内冲洗。CFD分析结果还表明，针腔内存在层流，并在针侧孔出口和针尖周围转变为过渡流和湍流。
结果表明，基于SST k-ω湍流模型的CFD有潜力作为研究根管冲洗的平台。
