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Apical Extrusion of Debris by Supplementary Files Used for Retreatment: An Ex Vivo Comparative Study

A.M. Pawar, M. Pawar, Z. Metzger, B, Thakur

Journal of Conservative Dentistry. 2016 March-April. 19(2):125-129.


AIM: This study evaluated whether using supplementary files for removing root canal filling residues after ProTaper Universal Retreatment files (RFs) increased the debris extrusion apically.

MATERIALS AND METHODS: Eighty mandibular premolars with single root and canal were instrumented with ProTaper Universal rotary system (SX-F3) and obturated. The samples were divided randomly into four groups (n = 20). Group 1 served as a control; only ProTaper Universal RFs D1-D3 were used, and the extruded debris was weighed. Groups 2, 3, and 4 were the experimental groups, receiving a twofold retreatment protocol: Removal of the bulk, followed by the use of supplementary files. The bulk was removed by RFs, followed by the use of ProTaper NEXT (PTN), WaveOne (WO), and Self-Adjusting File (SAF) for removal of the remaining root filling residues. Debris extruded apically were weighed and compared to the control group. Statistical analysis was performed using one-way analysis of variance (ANOVA) and post hoc Tukey's test.

RESULTS: All the three experimental groups presented significant difference (P < .01). The post hoc Tukey's test confirmed that Group 4 (SAF) exhibited significantly less (P < .01) debris extrusion between the three groups tested.

CONCLUSION: SAF results in less extrusion of debris when used as supplementary file to remove root-filling residues, compared to WO and PTN.


The full article is available for download on the website of the Journal of Conservative Dentistry.

pawar extrusion retreatment

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