Apical extruded debris, reciprocation, full rotation, Nickle Titanium instruments, single file system.


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Apical extrusion of infected debris into the periradicular tissues during endodontic instrumentation may lead to postoperative pain and flare-up. Debris usually contain dentine chips, necrotic pulp tissue, microorganisms and irrigant. The existing studies are inconclusive about which engine-driven system pushes less debris in the apical direction. The aim of the present study was to evaluate the amount of apically extruded debris associated with full rotation single-file nickel–titanium instrumentation systems compared to another system used in reciprocation motion. Methodology: After approval of BAU institutional review board, twenty extracted human mandibular premolar teeth were randomly assigned to two groups (n=10 per group), the root canals were instrumented according to the manufacturers’ instructions using the reciprocating single-file system Reciproc Blue (VDW), and the single-file rotary system OneCurve (MicroMega). The apically extruded debris were collected and dried in pre-weighed Eppendorf tubes. The amount of debris was assessed with a micro balance and statistically analyzed using Mann-Whitney U Test. The results showed that both systems produced debris with no statistically significant difference between them. Conclusions: Under the condition of this study, both systems caused apical debris extrusion. Reciprocal instrumentation was associated with more debris extrusion compared to rotary instrumentation, however without statistically significant difference.



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