Efficacy of Root Canal Filling Material Removal by Different Instruments Using Micro-computed Tomography

doi:10.13701/j.cnki.kqyxyj.2021.05.011

Abstract

Abstract: Objective: To evaluate the efficacy of removing filling materials from oval-shaped root canals by nickel-titanium instruments, ultrasonic instruments and hand instruments by Micro-CT (Micro-CT). Methods: Human mandibular premolars with single root canal were collected and prepared by K3 nickel-titanium instruments with crown-down technique, and then filled by cold lateral compaction. Oval-shaped root canals were randomly assigned into five groups, and retreated by the following techniques respectively: Hedstrom files, K3, Mtwo, R-Endo, and ultrasonic P5. Micro-CT was used to assess the volume of filling material before and after the removal procedure. Based on the volume of initial and residual filling material of each specimen, the percentage of filling material removed from the root canals by different techniques was calculated. Meanwhile, the time taken by various instruments to remove the root canal filling was recorded. Results: Hedstrom file group showed a greater filling material removal rate than Mtwo and ultrasonic P5 groups (P<0.05). There was no significant difference in the removal efficacy among Hedstrom file, K3 instrument, and R-Endo instrument groups(P>0.05). The time needed for manual Hedstrom file was significantly longer than the other four groups (P<0.05). Conclusion: In the oval root canals, nickel-titanium instruments can reduce the operating time compared with manual Hedstrom file

Key words: nickel-titanium instruments, micro-computed tomography, root canal retreatment

LI Fengxia, TAN Hong, LI Yanjun, RONG Li. Efficacy of Root Canal Filling Material Removal by Different Instruments Using Micro-computed Tomography[J]. Journal of Oral Science Research, 2021, 37(5): 431-435.

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