Evaluation of the Effect of Needle Position on Irrigant Flow in the C-shaped Root Canal Using a Computational Fluid Dynamics Model

Journal of Endodontics
Ruyan WangMarkus Haapasalo

Abstract

The purpose of this study was to investigate the effect of the orientation of a side-vented needle on the irrigant flow pattern in a C-shaped root canal system using computational fluid dynamics and to evaluate the real-time replacement of irrigant in the lateral canal (LC). A mandibular second molar with a complete C-shaped canal system was chosen for this study. The root canals were prepared and scanned, and then the images were exported to design software. A 30-G, side-vented irrigation needle was positioned with the open notch facing the lateral canal (case A) and rotated 90°, 180°, and 270° clockwise (cases B, C, and D, respectively). The flow pattern, irrigant replacement, velocity distribution, wall stress distribution, and apical pressure in the canal were analyzed. Most of the irrigant flowed to the canal outlet from the adjacent instrumented canal space with different trajectories in the 4 cases. The concentration of scalar immediately below the tip of the needle was exchanged quickly; the length of the cleared zone extended 3 mm beyond the tip of the needles. The depth of circulation in the LC in all cases increased during the first 0.2 seconds. After that, the exchange of irrigant reached a stable phase. Irrigant pe...Continue Reading

References

Apr 1, 1982·Oral Surgery, Oral Medicine, and Oral Pathology·J B Moser, M A Heuer
Aug 1, 1997·Journal of Endodontics·M MiyashitaT Sekizawa
Apr 18, 2007·Journal of Endodontics·Benjamin A Nielsen, J Craig Baumgartner
Apr 26, 2008·Journal of Endodontics·Sedigheh Khedmat, Noushin Shokouhinejad
Oct 22, 2008·Journal of Endodontics·Alessandra Sverberi CarvalhoMaria Nadir Gasparoto Mancini
Jan 13, 2009·International Endodontic Journal·C BoutsioukisE Kastrinakis
Oct 27, 2012·Croatian Medical Journal·Damir SnjaricDavor Kuis

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Citations

Apr 9, 2016·Brazilian Dental Journal·Paula Barcellos SilvaFernanda Geraldo Pappen
Jul 9, 2020·International Journal for Numerical Methods in Biomedical Engineering·Gaizka LoroñoRafael Cisneros
Jun 13, 2021·Journal of Endodontics·Christos Boutsioukis, Patricia Gutierrez Nova

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