title: Root canal area increase promoted by the EndoSequence and ProTaper systems: comparison by computed tomography.
abstract: BACKGROUND
  The aim of this study was to compare the increase of the root canal area after instrumentation with EndoSequence or ProTaper rotary systems.
  
  
  METHODS
  Twenty-two mesial root canals from mandibular molars were instrumented. Teeth were mounted on a base, numbered, and divided into 2 groups; teeth from 1-11 (PT group) were instrumented by using the ProTaper system, and teeth from 12-22 (ES group) were instrumented by using the EndoSequence system. Cone beam computed tomography was performed on all teeth before and after instrumentation. Measurements at 3, 5, and 7 mm as well as differences in instrument performance were statistically compared by the Student t test at 5% significance level.
  
  
  RESULTS
  Both systems increased significantly the root canal area (P < .05) at all levels. Comparison between the rotary systems showed significantly greater increase (P < .05) for EndoSequence at 3 mm, with no statistically significant difference (P < .05) at the other levels.
  
  
  CONCLUSIONS
  Both rotary systems increased significantly the root canal area.
authors.affiliation: CPO SL Mandic Brasiliense Dental School, Brasília, DF, Brazil. dr.ricardoaffonso@uol.com.br
authors.forename: Ricardo Affonso
authors.initials: RA
authors.lastname: Bernardes
authors.forename: Emerson Antunes
authors.initials: EA
authors.lastname: Rocha
authors.forename: Marco Antonio Hungaro
authors.initials: MA
authors.lastname: Duarte
authors.forename: Rodrigo Ricci
authors.initials: RR
authors.lastname: Vivan
authors.forename: Ivaldo Gomes
authors.initials: IG
authors.lastname: de Moraes
authors.forename: Alexandre S
authors.initials: AS
authors.lastname: Bramante
authors.forename: José Ribamar
authors.initials: JR
authors.lastname: de Azevedo
mesh_terms: D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003786:Dental Pulp Cavity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008963:Molar; D009811:Odontometry / Q000379:methods; D011312:Pressure; D012388:Root Canal Irrigants / Q000627:therapeutic use; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D019227:Tooth Apex / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D019237:Tooth Cervix / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D019415:Torque
chemical_list: D012388:Root Canal Irrigants; D012973:Sodium Hypochlorite