Effectiveness of reciprocating and rotary retreatment files in the removal of endodontic filling material.

Érica Reginato Cardoso, Izabela Volpato Marques Tookuni, Carlos Alberto Herrero Morais, Nair Narumi Orita Pavan, Gabriela Cristina Santin, Marcelo Capitanio, Marcos Sergio Endo

General dentistry 2022 Jan-Feb

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The aim of this study was to compare the effectiveness of a reciprocating file (Reciproc) and a rotary retreatment file (Mtwo retreatment [Mtwo-R]) for the removal of filling material during root canal retreatment. A total of 30 mandibular molars with a mesial root curvature between 20° and 40° were selected and prepared using a Reciproc R25 file. The canals were filled using the lateral condensation technique and a root canal sealer. The specimens were randomly allocated into 2 groups according to the retreatment technique used (n = 15): a Reciproc R25 file or Mtwo-R 15/.05 and 25/.05 files. After retreatment, the specimens were longitudinally sectioned and photographed with an operating microscope under ×10 magnification. The percentage of total remaining filling material and the percentages in the cervical, middle, and apical thirds of the specimens were calculated. The Student t test was used for statistical comparisons of the 2 groups, and the analysis of variance followed by Tukey test was used to verify differences among the root thirds within each group. No statistically significant difference between the 2 groups was detected in the percentage of total remaining filling material (P = 0.87) or the percentage in any of the thirds of the root canals (P > 0.05) after reinstrumentation. In both groups, there was a significantly greater amount of remaining material in the apical third (P < 0.05). The results suggested that there is no difference between the 2 systems in their effectiveness at removing filling material.

Citation

Érica Reginato Cardoso, Izabela Volpato Marques Tookuni, Carlos Alberto Herrero Morais, Nair Narumi Orita Pavan, Gabriela Cristina Santin, Marcelo Capitanio, Marcos Sergio Endo. Effectiveness of reciprocating and rotary retreatment files in the removal of endodontic filling material. General dentistry. 2022 Jan-Feb;70(1):22-25