Citation Information :
Ealla KR, Raj PT, Mudrakola DP, Baby D, Govindankutty RK, Davis D, Sasikumar TP. Evaluation of Effectiveness of Two Different Endodontic Retreatment Systems in Removal of Gutta-percha: An in vitro Study. J Contemp Dent Pract 2018; 19 (6):726-731.
Aim: To determine the effectiveness of two different endodontic retreatment systems for the removal of laterally compacted gutta-percha (GP).
Materials and methods: Sixty-three freshly extracted human maxillary central incisors were used for the study. The teeth were instrumented with K-flex files and obturated using lateral condensation technique with GP and AH Plus sealer. The teeth were divided into three retreatment groups, each group consisting of 21 teeth. Group I: D-RaCe desobturation files (D-RaCe); group II: ProTaper Universal retreatment files (PTUR); group III: Hedstrom files (H-file). After removal of GP, the teeth were split longitudinally and divided into three equal parts: Cervical, middle, and apical third. The middle and apical thirds of all root halves were examined using scanning electron microscope (SEM). The total surface area covered by the residual debris was evaluated using Motic Image plus 2.0 software. Statistical analysis was done by one-way analysis of variance (ANOVA) test with a p-value ≤0.05 used to determine significance and Tukey\'s multiple post hoc tests used for comparison between the groups, and ‘et’ test was done for comparison between the thirds within the same group.
Results: The PTUR retreatment files showed overall better performance compared with D-RaCe files and H-files. The PTUR files performed better at middle third compared with others. The PTUR files and D-RaCe files performed equally at apical third better than H-files.
Conclusion: ProTaper retreatment files are better compared with D-RaCe files and H-files for the retreatment of the previously endodontically treated teeth.
Clinical significance: Highest efficacy for the removal of GP was shown by ProTaper Universal System followed by D-RaCe and H-file.
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