title: The efficacy of the Self-Adjusting File versus WaveOne in removal of root filling residue that remains in oval canals after the use of ProTaper retreatment files: A cone-beam computed tomography study.
abstract: OBJECTIVE
  The current ex vivo study compared the efficacy of removing root fillings using ProTaper retreatment files followed by either WaveOne reciprocating file or the Self-Adjusting File (SAF).
  
  
  METHODS
  Forty maxillary canines with single oval root canal were selected and sectioned to obtain 18-mm root segments. The root canals were instrumented with WaveOne primary files, followed by obturation using warm lateral compaction, and the sealer was allowed to fully set. The teeth were then divided into two equal groups (N = 20). Initial removal of the bulk of root filling material was performed with ProTaper retreatment files, followed by either WaveOne files (Group 1) or SAF (Group 2). Endosolv R was used as a gutta-percha softener. Preoperative and postoperative high-resolution cone-beam computed tomography (CBCT) was used to measure the volume of the root filling residue that was left after the procedure. Statistical analysis was performed using t-test.
  
  
  RESULTS
  The mean volume of root filling residue in Group 1 was 9.4 (±0.5) mm(3), whereas in Group 2 the residue volume was 2.6 (±0.4) mm(3), (P < 0.001; t-test).
  
  
  CONCLUSIONS
  When SAF was used after ProTaper retreatment files, significantly less root filling residue was left in the canals compared to when WaveOne was used.
authors.affiliation: Department of Conservative Dentistry and Endodontics, D Y Patil Dental School, Lohegaon, Pune, Maharashtra, India.
authors.forename: Ajinkya M
authors.initials: AM
authors.lastname: Pawar
authors.affiliation: Department of Dentistry, Sir HN Reliance Foundation Hospital, Mumbai, Maharashtra, India.
authors.forename: Bhagyashree
authors.initials: B
authors.lastname: Thakur
authors.affiliation: Department of Endodontology, The Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Zvi
authors.initials: Z
authors.lastname: Metzger
authors.affiliation: Department of Endodontology, The Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Anda
authors.initials: A
authors.lastname: Kfir
authors.affiliation: Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Mumbai, Maharashtra, India.
authors.forename: Mansing
authors.initials: M
authors.lastname: Pawar
keywords: Cone-beam computed tomography (CBCT); ProTaper retreatment files; Self-Adjusting File (SAF); WaveOne; retreatment