title: Shaping Ability of ProTaper Next, WaveOne, and Reciproc in Simulated Root Canals.
abstract: BACKGROUND
  The study aimed to compare the shaping and preservation of the original curvature of simulated curved root canals using the following instruments: Reciproc (Rcp), WaveOne (Wo), and the ProTaper Next system (Ptn).
  
  
  METHODS
  A total of 45 resin blocks with simulated curved root canals were divided into three groups (n = 15), prepared using the Rcp (R25), Wo (25/0.8), and Ptn (X2) instruments. Standardized photographs were taken before and after canal instrumentation. After the superimposition of the images, the amount of resin removed from the curvature's inner and outer walls was measured at six apical levels, at intervals of 1 mm. The canals' angles of curvature before and after instrumentation were subtracted.
  
  
  RESULTS
  There were no significant differences between the instruments in terms of the total amount of resin removed of the inner or outer walls of the apical curvature (p > 0.05). The Rcp instruments provided the best resin removed ratios between the walls. The means of the change in angle were as follows: Wo = 2.15°, Ptn = 0.92°, and Rcp = 0.21°. WaveOne caused significantly higher deviations than Rcp.
  
  
  CONCLUSIONS
  All of the instruments demonstrated a tendency to straighten the simulated root canal. Instruments that use rotary movement achieved an effect similar to that of the reciprocating instruments in relation to change in angle.
  
  
  CONCLUSIONS
  Deviations from the original shape of the root canal could have a negative impact on the quality of a filling and consequently on the success of the endodontic treatment.
authors.affiliation: Department of Dentistry, CEUMA University, São Luís Maranhão, Brazil, Phone: +9881803085, e-mail: emmaiafilho@yahoo.com.br.
authors.forename: E M
authors.initials: EM
authors.lastname: Maia Filho
authors.affiliation: Department of Dentistry, CEUMA University, São Luís Maranhão, Brazil.
authors.forename: R M
authors.initials: RM
authors.lastname: Dos Reis Santos
authors.affiliation: Department of Dentistry, Federal University of Maranhão São Luis, Maranhão, Brazil.
authors.forename: Darlon M
authors.initials: DM
authors.lastname: Lima
authors.affiliation: Department of Dentistry, CEUMA University, São Luís Maranhão, Brazil.
authors.forename: S M
authors.initials: SM
authors.lastname: da Silva Pereira
authors.affiliation: Department of Dentistry, Federal University of Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais, Brazil.
authors.forename: Janir A
authors.initials: JA
authors.lastname: Soares
authors.affiliation: Department of Dentistry, CEUMA University, São Luís Maranhão, Brazil.
authors.forename: R R
authors.initials: RR
authors.lastname: de Jesus Tavarez
authors.affiliation: Department of Dentistry, CEUMA University, São Luís Maranhão, Brazil.
authors.forename: Meire C
authors.initials: MC
authors.lastname: Ferreira
authors.affiliation: Department of Dentistry, CEUMA University, São Luís Maranhão, Brazil.
authors.forename: Ceci N
authors.initials: CN
authors.lastname: Carvalho
authors.affiliation: Department of Dentistry, CEUMA University, São Luís Maranhão, Brazil.
authors.forename: Matheus C
authors.initials: MC
authors.lastname: Bandeca
authors.affiliation: Department of Post-Graduate Program in Integrated Dental Science, University of Cuiabá, Cuiabá, Mato Grosso, Brazil.
authors.forename: Mateus R
authors.initials: MR
authors.lastname: Tonetto
authors.affiliation: Department of Post-Graduate Program in Integrated Dental Science, University of Cuiabá, Cuiabá, Mato Grosso, Brazil.
authors.forename: Alvaro H
authors.initials: AH
authors.lastname: Borges
authors.affiliation: Department of Dentistry, CEUMA University, São Luís Maranhão, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: de Castro Rizzi
mesh_terms: D003198:Computer Simulation; D003722:Dental Alloys / Q000737:chemistry*; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D004867:Equipment Design; D006801:Humans; D008422:Materials Testing; D008953:Models, Anatomic; D009532:Nickel; D010781:Photography; D019279:Resin Cements; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods*; D012390:Root Canal Therapy / Q000295:instrumentation*; D012399:Rotation; D014025:Titanium / Q000737:chemistry; D019227:Tooth Apex / Q000033:anatomy & histology
chemical_list: D003722:Dental Alloys; D019279:Resin Cements; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium
keywords: Endodontics; Root canal preparation Rotary system.