四种根管冲洗液在根管内流动的计算流体动力学分析  

Computational fluid dynamics analysis of the flow of four irrigations in root canal

作　　者：马莹[1] 韩佳龙 于海燕[1] 王晓春[1] 

机构地区：[1]哈尔滨医科大学附属第四医院口腔科,150001

出　　处：《中华口腔医学杂志》2015年第6期352-357,共6页Chinese Journal of Stomatology

基　　金：黑龙江省自然科学基金（H201427）

摘　　要：目的 研究使用计算流体动力学模型分析冲洗针头位于根管内不同深度时,4种根管冲洗液在根管内的流动情况,以期为临床根管冲洗针头的放置位置提供参考.方法 测量5.25％次氯酸钠（A）、3％次氯酸钠（B）、17％乙二胺四乙酸（C）及2％氯己定（D）4种根管冲洗溶液的密度及黏度,应用ICEM CFD14.0软件建立底端开口平头针头的单根管冲洗模型,设置针头插入位置分别距生理性根尖孔1、3、5 mm.使用FLUENT 14.0软件设置计算条件,并计算4种冲洗液在单根管冲洗模型中的流动速度、根管壁切应力及根尖压力,通过FLUENT 14.0软件获取冲洗速度、根管壁切应力云图,并对4种冲洗液的结果云图进行比对分析.结果 A、B、C、D4种冲洗液对根管壁产生的切应力均在针头距生理性根尖孔1 mm时最大,分别为6.72×103、6.35×103、7.47×103及5.26×103Pa,且冲洗均到达解剖根尖孔;随着冲洗针头远离根尖孔,A、B、C、D4种冲洗液产生的最大切应力值均减小,针头距生理性根尖孔 3 mm时分别为2.31×103、2.05×103、2.59×103及1.81×103 Pa,距生理性根尖孔5 mm时分别为2.16×103、1.91×103、2.42×103及1.71×103 Pa.冲洗针头位于同一位置时,C冲洗液的压力值最大.结论临床使用平头冲洗针头时,冲洗针头宜放置在距生理性根尖孔 1～3 mm之间;使用17％乙二胺四乙酸冲洗液时,注射速度应小于其他3种冲洗液.Objective To analyze the flow of four irrigations in a root canal with different needle-insertion depth by using a computational fluid dynamics（CFD） model in order to provide a reference to the needle placement in clinical practice.Methods The density and viscosity of 5.25% sodium hypochlorite （A）,3% sodium hypochlorite（B）,17% ethylenediaminetetraacetic acid （EDTA,C）,2% chlorhexidine（D） were measured.A CFD model by ICEM software was used to simulate irrigant flow from an open-ended flat needle positioned at the depth of 1,3,5 mm to the physiological apical within the root canal.Velocity,wall shear stress and pressure in the root canal were evaluated after setting the computing conditions with FLUENT 14.0 software.Results All the wall shear stress generated by four fluids was at peak when the needle was positioned 1 mm to the physiological apical,which were 6.72× 103 Pa（A）,6.35× 103 Pa（B）,7.47× 103 Pa（C）,5.26× 103 Pa（D）,respectively.With the distance increasing,wall shear stress gradually decreased.The wall shear stress of A,B,C,D was 2.31 × 103,2.05× 103,2.59× 103 and 1.81 × 103 Pa,respectively in 3 mm group.The wall shear stress of A,B,C,D was 2.16× 103,1.91 × 103,2.42× 103,1.71 × 103 Pa,respectively in 5 mm group.Conclusions It was recommended that the distance between the needle and physiological apical is 1-3 mm when flushing the root canal.The injection speed of 17%EDTA should be slower than that of the other three solutions.

关 键 词：根管冲洗剂 牙髓腔 计算流体动力学 

分 类 号：R781.05[医药卫生—口腔医学]