title: Evaluation of apically extruded debris during root canal retreatment with two different rotary systems followed by a self-adjusting file.
abstract: OBJECTIVE
  To compare the amount of apically extruded debris during root canal retreatment using ProTaper retreatment system (Dentsply Maillefer, Ballaigues, Switzerland), ProTaper retreatment system with Self-Adjusting File (SAF) system (ReDent-Nova, Ra'anana, Israel), Mtwo retreatment system (VDW, Munich, Germany), Mtwo retreatment system with SAF instruments.
  
  
  METHODS
  In total, 72 extracted human mandibular incisor teeth were used. All root canals were prepared with ProTaper universal (Dentsply Maillefer) up to F2 file and filled with gutta percha and AH plus sealer using cold lateral condensation before being assembled randomly into 4 groups (n = 18 each). Root canal filling materials were removed using the ProTaper retreatment system, the ProTaper retreatment system followed by SAF system, Mtwo retreatment system and Mtwo retreatment system followed by SAF system. Debris extruded apically during the removal of canal filling material was collected into preweighed Eppendorf tubes. The tubes were then stored in an incubator at 70°C for 5 days. The weight of the dry extruded debris was established by subtracting the preretreatment and postretreatment weight of the Eppendorf tubes for each group. The data obtained were analyzed using Kruskal-Wallis test.
  
  
  RESULTS
  All retreatment techniques caused the apical extrusion of debris. There was no significant difference between the groups statistically (p&gt;0.05).
  
  
  CONCLUSIONS
  The results of this study showed that SAF system after Mtwo retreatment system and ProTaper retreatment system for improving retreatment has no significant effect on the amount of debris extruded apically.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Ordu University, Ordu - Turkey.
authors.forename: Fatih
authors.initials: F
authors.lastname: Cakici
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Ordu University, Ordu - Turkey.
authors.forename: Elif B
authors.initials: EB
authors.lastname: Cakici
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Ordu University, Ordu - Turkey.
authors.forename: Funda Fundaoglu
authors.initials: FF
authors.lastname: Küçükekenci
mesh_terms: D003782:Dental Pulp; D003786:Dental Pulp Cavity / Q000601:surgery*; D004867:Equipment Design; D006801:Humans; D011897:Random Allocation; D019233:Retreatment; D012387:Root Canal Filling Materials / Q000009:adverse effects / Q000627:therapeutic use; D018915:Root Canal Preparation / Q000295:instrumentation*; D012390:Root Canal Therapy / Q000295:instrumentation*; D014070:Tooth / Q000601:surgery*
chemical_list: D012387:Root Canal Filling Materials