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Table 1 Effect of needle working depth on irrigation efficiency in a real 23.4°-curved-root canal with a 30-G flat needle

From: Influence of needle working length and root canal curvature on irrigation: a computational fluid dynamics analysis based on a real tooth

Needle working length (mm)

Depth of effective velocity* (mm)

Effective shear stress#

Clean span (mm)

Clean depth (mm)

4.75

9.50

4.96

9.04

5

9.75

4.69

9.01

5.25

9.69

4.84

8.78

5.5

9.08

4.65

8.59

  1. *Effective velocity: > 0.1 m/s; #effective shear stress: ≥ 100 Pa
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BMC Oral Health

ISSN: 1472-6831

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