title: Apically extruded dentin debris by reciprocating single-file and multi-file rotary system.
abstract: OBJECTIVE
  This study aims to evaluate the apical extrusion of debris by the two reciprocating single-file systems: WaveOne and Reciproc. Conventional multi-file rotary system was used as a reference for comparison. The hypotheses tested were (i) the reciprocating single-file systems extrude more than conventional multi-file rotary system and (ii) the reciprocating single-file systems extrude similar amounts of dentin debris.
  
  
  METHODS
  After solid selection criteria, 80 mesial roots of lower molars were included in the present study. The use of four different instrumentation techniques resulted in four groups (n = 20): G1 (hand-file technique), G2 (ProTaper), G3 (WaveOne), and G4 (Reciproc). The apparatus used to evaluate the collection of apically extruded debris was typical double-chamber collector. Statistical analysis was performed for multiple comparisons.
  
  
  RESULTS
  No significant difference was found in the amount of the debris extruded between the two reciprocating systems. In contrast, conventional multi-file rotary system group extruded significantly more debris than both reciprocating groups. Hand instrumentation group extruded significantly more debris than all other groups.
  
  
  CONCLUSIONS
  The present results yielded favorable input for both reciprocation single-file systems, inasmuch as they showed an improved control of apically extruded debris.
  
  
  CONCLUSIONS
  Apical extrusion of debris has been studied extensively because of its clinical relevance, particularly since it may cause flare-ups, originated by the introduction of bacteria, pulpal tissue, and irrigating solutions into the periapical tissues.
authors.affiliation: UNIGRANRIO, Grande Rio University, Duque de Caxias, RJ, 22061-030, Brazil, endogus@gmail.com.
authors.forename: Gustavo
authors.initials: G
authors.lastname: De-Deus
authors.forename: Aline
authors.initials: A
authors.lastname: Neves
authors.forename: Emmanuel João
authors.initials: EJ
authors.lastname: Silva
authors.forename: Thais Accorsi
authors.initials: TA
authors.lastname: Mendonça
authors.forename: Caroline
authors.initials: C
authors.lastname: Lourenço
authors.forename: Camila
authors.initials: C
authors.lastname: Calixto
authors.forename: Edson Jorge Moreira
authors.initials: EJ
authors.lastname: Lima
mesh_terms: D003762:Dental Instruments; D003804:Dentin; D006801:Humans; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods*