Apical extrusion of debris by supplementary files used for retreatment: An ex vivo comparative study.
OBJECTIVE
This study evaluated whether using supplementary files for removing root canal filling residues after ProTaper Universal Retreatment files (RFs) increased the debris extrusion apically.


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.


CONCLUSIONS
SAF results in less extrusion of debris when used as supplementary file to remove root-filling residues, compared to WO and PTN.
Department of Conservative Dentistry and Endodontics, DY Patil Dental School and Hospital, Pune, India.
Ajinkya M
AM
Pawar
Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Mumbai, Maharashtra, India.
Mansing
M
Pawar
Department of Endodontology, The Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel.
Zvi
Z
Metzger
Department of Dentistry, Sir HN Reliance Foundation Hospital, Mumbai, Maharashtra, India.
Bhagyashree
B
Thakur
Apical debris extrusion; ProTaper NEXT (PTN); ProTaper Retreatment files (RFs); Self-Adjusting File (SAF); WaveOne (WO); endodontic retreatment