title: Evaluation of the Efficacy of TRUShape and Reciproc File Systems in the Removal of Root Filling Material: An Ex Vivo Micro-Computed Tomographic Study.
abstract: BACKGROUND
  The purpose of this study was to evaluate the efficacy of TRUShape (Dentsply Tulsa Dental Specialties, Tulsa, OK) compared with the Reciproc file (VDW, Munich, Germany) in the removal of filling material from oval canals filled with 2 different sealers and differences in the working time.
  
  
  METHODS
  Sixty-four mandibular canines with oval canals were prepared and divided into 4 groups (n = 16). Half of the specimens were filled with gutta-percha and pulp canal sealer (PCS), and the remainders were filled with gutta-percha and bioceramic sealer (BCS). The specimens were retreated using either the Reciproc or TRUShape files. A micro-computed tomographic scanner was used to assess filling material removal, and the time taken for removal was also recorded. Data were analyzed using the Kruskal-Wallis and Mann-Whitney U tests.
  
  
  RESULTS
  The mean volume of the remaining filling material was similar when comparing both files (P ≥ .05). However, in the groups filled with BCS, the percentage of remaining filling material was higher than in the groups filled with PCS (P < .05). The reciprocating file allowed for faster filling removal than the TRUShape files (P < .05). Retreatment was faster in the groups that were filled with PCS compared with those filled with BCS (P < .05).
  
  
  CONCLUSIONS
  There was no difference regarding the percentage of remaining filling material when comparing both files system; however, Reciproc was faster than TRUShape. BCS groups exhibited significantly more remaining filling material in the canals and required more time for retreatment. Remaining filling material was observed in all samples regardless of the technique or sealer used.
authors.affiliation: Department of Endodontics, Paulista Dental Association, São Paulo, São Paulo, Brazil.
authors.forename: Arthur
authors.initials: A
authors.lastname: de Siqueira Zuolo
authors.affiliation: Department of Endodontics, Paulista Dental Association, São Paulo, São Paulo, Brazil.
authors.forename: Mario Luis
authors.initials: ML
authors.lastname: Zuolo
authors.affiliation: Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil.
authors.forename: Carlos Eduardo
authors.initials: CE
authors.lastname: da Silveira Bueno
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 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: D003722:Dental Alloys; D003786:Dental Pulp Cavity / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D004867:Equipment Design; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008422:Materials Testing; D009532:Nickel / Q000737:chemistry; D011897:Random Allocation; D019233:Retreatment / Q000295:instrumentation* / Q000379:methods; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation / Q000295:instrumentation* / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D012399:Rotation; D014025:Titanium / Q000737:chemistry; D014057:Tomography, X-Ray Computed / Q000379:methods; D019227:Tooth Apex / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D014092:Tooth Root / Q000033:anatomy & histology / Q000000981:diagnostic imaging*
chemical_list: D003722:Dental Alloys; D012387:Root Canal Filling Materials; C040654:titanium nickelide; D009532:Nickel; D006171:Gutta-Percha; D014025:Titanium
keywords: Micro–computed tomography; Reciproc; TRUShape; root canal retreatment