In vitro evaluation of working time during endodontic retreatment
2023
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© 2023 International Endodontic Journal. Published by John Wiley & Sons Ltd.
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Aim: The aim of this in vitro study was to evaluate the working time for gutta-percha and sealer removal using different instrumentation techniques.
Methodology: The root canals of seventy-two extracted single-rooted straight premolars were prepared using BioRaCc rotary instruments and crown-down technique, before filling with laterally condensed gutta-percha and AH Plus" sealer. After 30-day storage at 37°C and 100% humidity, teeth were randomly allocated to 3 groups (n = 24) depending on retreatment instrumentation technique: ProTaper Universal Retreatment System (PTUS); D-RaCe System and Hedstrom hand files. Stopwatch was used for measuring the working time. Measuring included the time required to reach the working length, time to complete the filling material removal and total retreatment time. The criteria for complete filling material removal was absence of gutta-percha or scaler remnants during irrigation or attached to the files. Time required for gutta-percha removal, irrigation, working length measurement, instruments changing and cleaning was considered as a total retreatment time. Data were analysed using one-way ANOVA and Scheffe's post-hoc test.
Results: No significant difference between groups was demonstrated when comparing the time required to reach the working length. Complete removal of filling material was the fastest in PTUS group and the slowest in Hedstrom group. Significant differences were found between each group (p < 0.0001). After measuring the total retreatment time, significant differences were found when comparing both rotary systems to Hedstrom group (p < 0.0001), but no significant difference was found when comparing PTUS to D-RaCe, although the procedure was the fastest in PTUS group.
Conclusion: Usage of rotary NiTi instruments for the removal of root filling material during retreatrnent procedure is less time-consuming comparing to hand files. No significant difference was recorded between two tested rotary systems.
U:
- European Society of Endodontology: Abstracts from the Biennial Conference; 2022 Sep 7-10; Budapest, Hungary. Hoboken: John Wiley & Sons Ltd; 2023. p. 45. (International Endodontic Journal; Vol. 56; No. S1).