title: The self-adjusting file instrumentation results in less debris extrusion apically when compared to WaveOne and ProTaper NEXT.
abstract: OBJECTIVE
  The present ex vivo study aimed to evaluate the debris extrusion after instrumenting the root canals by three different files systems.
  
  
  METHODS
  Sixty extracted human mandibular premolars with single canals were selected and randomly divided into three groups (n = 20) for instrumentation with three different files. Group 1: WaveOne (primary) single reciprocating file (WO; Dentsply Maillefer, Ballaigues, Switzerland) (25/08), Group 2: Self-adjusting file (SAF; ReDent-Nova, Ra'anana, Israel) (1.5 mm), and Group 3: ProTaper NEXT X1 and X2 (PTN; Dentsply Tulsa Dental, Tulsa, OK) (25/06). Debris extruding by instrumentation were collected into pre-weighed Eppendorf tubes. These tubes were then stored in an incubator at 70°C for 5 days. The tubes were then weighed to obtain the final weight, with the extruded debris. Statistical analysis for the debris extruded apically was performed using one-way analysis of variance and post hoc Tukey's test.
  
  
  RESULTS
  The statistical analysis showed a significant difference between all the three groups tested (P < 0.01). The following post hoc Tukey's test confirmed that Group 2 (SAF) exhibited significantly least (P < 0.01) debris extrusion between the three groups tested.
  
  
  CONCLUSIONS
  The SAF resulted in significantly less extrusion of debris when compared to reciprocating WO and rotary PTN.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Dnyandeo Yashwantrao Patil Dental School and Hospital, Lohegaon, Pune, India.
authors.forename: Ajinkya M
authors.initials: AM
authors.lastname: Pawar
authors.affiliation: Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Mumbai, India.
authors.forename: Mansing G
authors.initials: MG
authors.lastname: Pawar
authors.affiliation: Department of Endodontology, The Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Zvi
authors.initials: Z
authors.lastname: Metzger
authors.affiliation: Department of Conservative Dentistry and Endodontics, Yashwant Memorial Trust Dental College and Hospital, Kharghar, Navi-Mumbai, Maharashtra, India.
authors.forename: Sharad R
authors.initials: SR
authors.lastname: Kokate
keywords: Apical extrusion; ProTaper; SAF and NEXT; WaveOne; debris; instrumentation
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