title: Glide Path Management with Single- and Multiple-instrument Rotary Systems in Curved Canals: A Micro-Computed Tomographic Study.
abstract: BACKGROUND
  Securing a reproducible glide path before instrumentation is recommended to maintain the original geometry of the root canal system and to prevent file separation. Mechanical glide path management systems have been introduced to expedite this step. The aim of this study was to compare apical transportation, canal volume increase, and working time during glide path management with ProGlider (PG; Dentsply Tulsa Dental Specialties, Tulsa, OK) and PathFiles (PF, Dentsply Tulsa Dental Specialties).
  
  
  METHODS
  Forty curved mesial canals of mandibular molars were randomly allocated into 2 experimental groups (n = 20) according to the glide path management system: PG or PF. A glide path was achieved according to the manufacturers' protocol. Micro-computed tomographic analysis was performed to assess apical transportation at 1, 3, and 5 mm and volume increase. The time required to achieve the glide path was measured.
  
  
  RESULTS
  The overall apical transportation mean values (± standard error) were 13.33 ± 3.37 μm for PG and 19.21 ± 4.4 μm for PF (P > .05). The mean (± standard error) volume increase values were 0.49 ± 0.06 mm(3) for PG and 0.48 ± 0.06 mm(3) for PF (P > .05). A statistically significant difference in the working time was found between the groups (P < .0001) where the mean (± standard error) values for time were 7.38 ± 1.73 seconds for PG and 20.61 ± 5.54 seconds for PF.
  
  
  CONCLUSIONS
  Similar apical transportation and volume increase occurred during glide path management with PG single-file and PF multi-file systems; however, PG achieved glide path faster than PF.
authors.affiliation: Endodontic Fellowship Program, University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: Alison Luís
authors.initials: AL
authors.lastname: Kirchhoff
authors.affiliation: Department of Restorative Dentistry, Discipline of Endodontics, University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: Rene
authors.initials: R
authors.lastname: Chu
authors.affiliation: Department of Dental Clinical Sciences, Division of Endodontics, Dalhousie University, Halifax, Nova Scotia, Canada.
authors.forename: Isabel
authors.initials: I
authors.lastname: Mello
authors.affiliation: Discipline of Endodontics, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Andres Dario Plazas
authors.initials: AD
authors.lastname: Garzon
authors.affiliation: Discipline of Endodontics, University of São Paulo, São Paulo, São Paulo, Brazil.
authors.forename: Marcelo
authors.initials: M
authors.lastname: dos Santos
authors.affiliation: Department of Restorative Dentistry, Discipline of Endodontics, University of Manitoba, Winnipeg, Manitoba, Canada. Electronic address: rodrigo.cunha@umanitoba.ca.
authors.forename: Rodrigo Sanches
authors.initials: RS
authors.lastname: Cunha
mesh_terms: D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D006801:Humans; D008963:Molar / Q000033:anatomy & histology; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods*; D013997:Time Factors; D016896:Treatment Outcome; D055114:X-Ray Microtomography
keywords: Apical transportation; PathFile; ProGlider; glide path; micro–computed tomography