title: Cleaning capacity of hybrid instrumentation technique using reamer with alternating cutting edges system files: Histological analysis.
abstract: OBJECTIVE
  The aim of the following study is to evaluate the cleaning capacity of a hybrid instrumentation technique using Reamer with Alternating Cutting Edges (RaCe) system files in the apical third of mesial roots of mandibular molars.
  
  
  METHODS
  Twenty teeth were selected and separated into two groups (n = 20) according to instrumentation technique as follows: BioRaCe - chemomechanical preparation with K-type files #10 and #15; and files BioRaCe BR0, BR1, BR2, BR3, and BR4; HybTec - hybrid instrumentation technique with K-type files #10 and #15 in the working length, #20 at 2 mm, #25 at 3 mm, cervical preparation with Largo burs #1 and #2; apical preparation with K-type files #15, #20, and #25 and RaCe files #25.04 and #30.04. The root canals were irrigated with 1 ml of 2.5% sodium hypochlorite at each change of instrument. The specimens were histologically processed and photographed under light optical microscope. The images were inserted onto an integration grid to count the amount of debris present in the root canal.
  
  
  RESULTS
  BioRaCe presented the highest percentage of debris in the apical third, however, with no statistically significant difference for HybTec (P > 0.05).
  
  
  CONCLUSIONS
  The hybrid technique presented similar cleaning capacity as the technique recommended by the manufacturer.
authors: Department of Endodontics, School of Dentistry, Federal University of Amazonas, Brazil.
authors: Emilio Carlos Sponchiado
authors: EC
authors: Júnior
authors: Department of Restorative Dentistry, Araraquara School of Dentistry, University of São Paulo State, Araraquara, Brazil.
authors: Tiago Silva
authors: TS
authors: da Fonseca
authors: Department of Restorative Dentistry, Araraquara School of Dentistry, University of São Paulo State, Araraquara, Brazil.
authors: Matheus Franco
authors: MF
authors: da Frota
authors: Department of Endodontics, State University of Amazonas, Manaus, AM, Brazil.
authors: Fredson Marcio Acris
authors: FM
authors: de Carvalho
authors: Department of Endodontics, State University of Amazonas, Manaus, AM, Brazil.
authors: André Augusto Franco
authors: AA
authors: Marques
authors: Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors: Lucas da Fonseca Roberti
authors: Lda F
authors: Garcia
keywords: Cleaning capacity; endodontics; root canal treatment; rotary endodontics