Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology · 2015
[Computational fluid dynamics analysis of the flow of four irrigations in root canal].
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Ma Ying, Han Jialong, Yu Haiyan, Wang Xiaochun
Аннотация
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 FLUENT14.0 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.
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 FLUENT14.0 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.