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Open Access 04-05-2024 | Original Article

Irrigant dynamics of a back-to-back double side-vented needle in root canals with various tapers: a computational fluid dynamics study

Authors: Surmayee Singh, Mohammad Zuber, Prathmesh Pravin Verekar, Tejaswini Shetty, N. Srikant, Manuel S. Thomas

Published in: Odontology

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Abstract

Understanding the apical pressure and irrigant flow patterns in root canals is crucial for safe and effective irrigation. Therefore, this study aimed to assess the flow characteristics of irrigants in root canal models with varying tapers during final irrigation by employing various needle designs, including a back-to-back double-side-vented needle, through computational fluid dynamics. The root canal model was configured as a closed geometrical cone with a simulated apical zone (size 30) and features tapers of 4%, 6%, and 8%. Three needle types—open-ended needle (OEN), single side-vented needle (SSVN), and double side-vented needle (DSVN)—were investigated. The results indicated that for the 4% taper models, the open-ended needle generated the maximum apical pressure, followed by the double side-vented needle and the single side-vented needle. However, in the 6% and 8% tapering root canal models, the double-side-vented needle applied the lowest maximum apical pressure. Consequently, the DSVN can pose a risk for irrigant extrusion in minimally prepared canals due to heightened apical pressure. In wider canals, the DSVN exhibited lower apical pressure. The maximum irrigant replacement was observed with OEN compared to that of the closed-ended group for both flow rates. Additionally, compared with OENs, closed-ended needles exhibited nonuniform and lower shear wall stress.
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Metadata
Title
Irrigant dynamics of a back-to-back double side-vented needle in root canals with various tapers: a computational fluid dynamics study
Authors
Surmayee Singh
Mohammad Zuber
Prathmesh Pravin Verekar
Tejaswini Shetty
N. Srikant
Manuel S. Thomas
Publication date
04-05-2024
Publisher
Springer Nature Singapore
Published in
Odontology
Print ISSN: 1618-1247
Electronic ISSN: 1618-1255
DOI
https://doi.org/10.1007/s10266-024-00940-2