title: Histological evaluation of the cleaning effectiveness of two reciprocating single-file systems in severely curved root canals: Reciproc versus WaveOne.
abstract: OBJECTIVE
  The aim of this study was to evaluate the cleaning effectiveness achieved with two reciprocating single-file systems in severely curved root canals: Reciproc and WaveOne.
  
  
  METHODS
  Twenty-five mesial roots of mandibular molars were randomly separated into two groups, according to the instrumentation system used. The negative control group consisted of five specimens that were not instrumented. The mesial canals (buccal and lingual) in Reciproc Group were instrumented with file R25 and the WaveOne group with the Primary file. The samples were submitted to histological processing and analyzed under a digital microscope.
  
  
  RESULTS
  The WaveOne group presented a larger amount of debris than the Reciproc Group, however, without statistically significant difference (P > 0.05). A larger amount of debris in the control group was observed, with statistically significant difference to Reciproc and WaveOne groups (P < 0.05).
  
  
  CONCLUSIONS
  The two reciprocating single-file instrumentation systems presented similar effectiveness for root canal cleaning.
authors.affiliation: Department of Endodontics, State University of Amazonas, Manaus, Amazonas, Brazil.
authors.forename: Maira de Souza
authors.initials: MS
authors.lastname: Carvalho
authors.affiliation: Department of Endodontics, Federal University of Amazonas, Manaus, Amazonas, Brazil.
authors.forename: Emílio Carlos
authors.initials: EC
authors.lastname: Sponchiado
authors.affiliation: Department of Endodontics, Federal University of Amazonas, Manaus, Amazonas, Brazil.
authors.forename: Angela Delfina Bitencourt
authors.initials: ADB
authors.lastname: Garrido
authors.affiliation: Department of Physiology and Pathology, Araraquara School of Dentistry, Univ Estadual Paulista, Araraquara, São Paulo, Brazil.
authors.forename: Lucas da Fonseca Roberti
authors.initials: LDFR
authors.lastname: Garcia
authors.affiliation: Department of Endodontics, State University of Amazonas, Manaus, Amazonas, Brazil.
authors.forename: André Augusto Franco
authors.initials: AAF
authors.lastname: Marques
keywords: Cleaning; reciprocating motion; reciprocating single-file system