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. 2016 Mar-Apr;19(2):125-9.
doi: 10.4103/0972-0707.178686.

Apical extrusion of debris by supplementary files used for retreatment: An ex vivo comparative study

Ajinkya M Pawar  1 , Mansing Pawar  2 , Zvi Metzger  3 , Bhagyashree Thakur  4
Affiliations

Apical extrusion of debris by supplementary files used for retreatment: An ex vivo comparative study

Ajinkya M Pawar et al. J Conserv Dent. 2016 Mar-Apr.

Abstract

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.

Keywords: Apical debris extrusion; ProTaper NEXT (PTN); ProTaper Retreatment files (RFs); Self-Adjusting File (SAF); WaveOne (WO); endodontic retreatment.

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Figures

Figure 1
Figure 1
Collected debris after retreatment procedure
Graph 1
Graph 1
Meanwise distribution of the weights of apically extruded debris by the three experimental files (PTN, WO, and SAF) after the use of Universal ProTaper RFs. Statistically significant difference seen in all the three groups with WaveOne (*) exhibiting the highest and SAF (#) exhibiting the lowest extrusion of debris when used in retreatment
Graph 2
Graph 2
Percentage of increased debris extruded by the experimental files after subtracting from the weights obtained from the control group. WO was associated with 27%, PTN with 19%, and SAF with 12% increase in debris when used as supplementary files after using the PT RFs
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