title: Comparison of different retreatment techniques and root canal sealers: a scanning electron microscopic study.
abstract: The aim of this study was to evaluate the effectiveness of two retreatment techniques, in terms of the operating time and scanning electron microscopy (SEM) results, in removing three different root canal sealers from root canals that were previously filled with gutta-percha. Sixty extracted single-rooted human premolars were divided into three groups and filled with iRoot SP, MM Seal, and AH Plus sealers, along with gutta-percha, through a lateral compaction technique. Root canal fillings of the samples were removed by ESI ultrasonic tips or R-Endo files. The time to reach the working length was recorded. Longitudinally sectioned samples were examined under SEM magnification. Each picture was evaluated in terms of the residual debris. Data were statistically analyzed with the Kruskall-Wallis test. No statistically significant differences were found in terms of operating time (p>0.05). Significant differences in the number of debris-free dentinal tubules were found among the root canal thirds, but this finding was not influenced by the experimental group (p<0.05). Resin sealer tags were observed inside the dentinal tubules in the MM Seal group. Under the conditions of this study, it may be established that there was no difference among the sealers and retreatment techniques.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey.
authors.forename: Neslihan
authors.initials: N
authors.lastname: Simsek
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey.
authors.forename: Ali
authors.initials: A
authors.lastname: Keles
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey.
authors.forename: Fuat
authors.initials: F
authors.lastname: Ahmetoglu
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey.
authors.forename: Mevlüt Sinan
authors.initials: MS
authors.lastname: Ocak
authors.affiliation: Department of Bioistatistics, Faculty of Medicine, Inonu University.
authors.forename: Saim
authors.initials: S
authors.lastname: Yologlu
mesh_terms: D004853:Epoxy Resins / Q000627:therapeutic use; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000627:therapeutic use; D015203:Reproducibility of Results; D019233:Retreatment / Q000379:methods; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D012390:Root Canal Therapy / Q000295:instrumentation / Q000379:methods*; D018709:Statistics, Nonparametric; D013997:Time Factors; D014025:Titanium / Q000627:therapeutic use; D016896:Treatment Outcome
chemical_list: D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; C040654:titanium nickelide; D009532:Nickel; D006171:Gutta-Percha; D014025:Titanium