Efficacy of gutta-percha solvent for removing gutta-percha from curved root canals
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Abstract
Objectives: The aim of this study was to compare the efficacies of the following gutta-percha removal techniques: NiTi rotary files, hand files, and hand files with solvent. Additionally, the study observed the dentin loss and complications that can occur during the process.
Materials and Methods: Forty extracted human maxillary molars with severely curved mesiobuccal or distobuccal roots were selected. After root canal preparation, the curved canals were filled with gutta-percha and AH Plus sealer. The teeth were randomly allocated into 4 groups with different gutta-percha removal techniques: group 1 - rotary retreatment files, group 2 - hand files, group 3 - hand files with natural gutta-percha solvent, and group 4 - hand files with chloroform. The teeth were scanned by micro-computed tomography after instrumentation, root canal filling, and gutta-percha removal to assess the volume of residual gutta-percha, and percentage of dentin loss and any procedural errors. The statistical analyses were conducted using ANOVA to compare root canal curvatures, and the Kruskal-Wallis and Dunn’s tests were employed for comparing the remaining gutta-percha and dentin loss. A significance level of 5% was applied.
Results: The residual gutta-percha in the hand files with chloroform and hand files with gutta-percha solvent groups was 2.56% and 4.34%, respectively, which were significantly (p < .05) lower than those of the hand files and rotary retreatment files groups (12.88% and 13.12%). The percentages of dentin loss were not significantly different (p > .05) among the groups. Root perforation and instrument separation were not observed.
Conclusion: For retreating severely curved canals, using hand files with solvent was superior to using hand files and rotary files alone for removing gutta-percha.
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