Abstract
Aim: to evaluate the amount of debris extruded apically as well as the time needed for removal of root canal filling material using ProTaper, MTwo, REndo NiTi rotary retreatment systems and handfiles. Materials and methods: 60 freshly extracted human single-rooted teeth were instrumented with Protaper files and obturated with gutta-percha and MTA Fillapex sealer with the cold lateral compaction technique. Teeth were then randomly assigned to 4 groups. ProTaper, MTwo, REndo rotary retreatment systems and Hedstroem hand files were utilized for root canal filling removal. Debris extruded apically was collected into pre-weighed vials. The weight of the dry extruded debris was established by subtracting the pre-retreatment and post-re treatment weight of vials. Time needed for reaching WL, complete removal of gutta-percha and total retreatment time were also recorded with a stopwatch. The data obtained were analyzed using One-way ANOVA (the level of significance was set at P=0.05). Results: Hand instrumentation caused significantly more debris extrusion compared with rotary systems (P<0.001). There was no significant difference among the other groups (P>0.05). Hedstroem hand files needed significantly more time for the completion of the retreatment procedure than rotary systems (P<0.001). Among rotary retreatment files, ProTaper completed the procedure significantly quicker than MTwo and REndo (P<0.001). Conclusion: Rotary retreatment files caused less apical extrusion of debris and needed less time for the completion of the retreatment procedure compared to hand files.
Highlights
Nonsurgical retreatment is the treatment of choice for the majority of failed endodontically treated teeth[7,10,36]
Hand instrumentation caused significantly more debris extrusion compared with rotary systems (P
The mean, standard deviations, median, minimum and maximum weight of debris extruded apically in each group are summarized in table 2
Summary
Nonsurgical retreatment is the treatment of choice for the majority of failed endodontically treated teeth[7,10,36]. The main goal of endodontic retreatment is to regain access to the apical foramen by complete removal of the filling materials, and to facilitate sufficient cleaning and shaping of the root canal system[19,34]. Numerous techniques have been described for removal of the root canal filling materials, including the use of hand or rotary instruments, heat, ultrasonics or chemical solvents in different combinations[11,15,21,25]. Apical Extrusion of Debris during Retreatment 23 removal of filling material during retreatment as opposed to hand files[22,26]. MTwo Retreatment system consists of one file for narrow canals and another for medium and wide canals (Table 1)
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