Effect of needle insertion depth and root canal curvature on irrigant extrusion ex vivo

Z. Psimma, C. Boutsioukis, E. Kastrinakis, L. Vasiliadis

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62 Citations (Scopus)
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Introduction The aim of this study was to evaluate the effect of needle type and insertion depth, apical preparation size, and root canal curvature on irrigant extrusion by using a recently introduced method. Methods Sixteen human teeth with a straight root canal (group A) and 16 with a moderately curved root canal (group B) were sequentially prepared to sizes 25 or 35, .06 taper and mounted on a plastic vial filled with distilled water to simulate a periapical lesion. The vial was either closed or open to the environment. A point-conductivity probe was used to determine the volume of extruded irrigant into the vial. NaOCl was delivered by an open-ended or a closed-ended needle at 1, 3, or 5 mm short of working length. Results were analyzed by two 4-way mixed-design analyses of variance. The level of significance was set to P < .05. Results The open-ended needle extruded significantly more irrigant than the closed-ended. Irrigant extrusion decreased as needles moved away from working length or when the apical size was increased. Needle wedging increased extrusion, especially when an open-ended needle was used. Root canal curvature did not have a statistically significant effect on irrigant extrusion. Conclusions Needle type, needle insertion depth, and apical preparation size had a significant effect on irrigant extrusion
Original languageEnglish
Pages (from-to)521-524
Number of pages4
JournalJournal of endodontics
Issue number4
Publication statusPublished - 30 Jan 2013


  • IR-83734
  • METIS-293938


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